Show when a channel resource changes (#3074)

Mikayla Maki created

This PR adds a mechanism for notifying the client when a channel note
has been edited or a message has been changed.

TODO: 
- [x] Fix infinite loop when opening the chat panel
- [x] Switch to client-side ack model of observation detection
- [x] Add client-side-only change detection (e.g. for when a channel
note is open locally but not focused)
- [x] Review implementation / query performance.
- [x] Fix lack of ACK on restart for channel buffers
- [x] remove channel note opening on click
- [x] Fix channel messages sent while chat channel is in the background
not showing the channel as changed.

Release Notes:

- N/A

Change summary

Cargo.lock                                                      | 549 ++
Cargo.toml                                                      |   2 
crates/ai/Cargo.toml                                            |   2 
crates/assistant/Cargo.toml                                     |   2 
crates/call/src/room.rs                                         |  16 
crates/channel/Cargo.toml                                       |   3 
crates/channel/src/channel.rs                                   |   2 
crates/channel/src/channel_buffer.rs                            |  57 
crates/channel/src/channel_chat.rs                              |  39 
crates/channel/src/channel_store.rs                             |  85 
crates/channel/src/channel_store/channel_index.rs               |  76 
crates/client/Cargo.toml                                        |   2 
crates/client/src/client.rs                                     |  28 
crates/collab/Cargo.toml                                        |  11 
crates/collab/migrations.sqlite/20221109000000_test_schema.sql  |  21 
crates/collab/migrations/20230925210437_add_channel_changes.sql |  19 
crates/collab/src/db.rs                                         |  16 
crates/collab/src/db/ids.rs                                     |  54 
crates/collab/src/db/queries.rs                                 |  10 
crates/collab/src/db/queries/buffers.rs                         | 326 +
crates/collab/src/db/queries/channels.rs                        |  23 
crates/collab/src/db/queries/contacts.rs                        |   4 
crates/collab/src/db/queries/messages.rs                        | 184 
crates/collab/src/db/queries/users.rs                           |   2 
crates/collab/src/db/tables.rs                                  |   2 
crates/collab/src/db/tables/observed_buffer_edits.rs            |  43 
crates/collab/src/db/tables/observed_channel_messages.rs        |  41 
crates/collab/src/db/tests.rs                                   |   4 
crates/collab/src/db/tests/buffer_tests.rs                      | 348 +
crates/collab/src/db/tests/message_tests.rs                     | 185 +
crates/collab/src/rpc.rs                                        |  92 
crates/collab/src/tests/channel_buffer_tests.rs                 | 142 
crates/collab/src/tests/channel_message_tests.rs                | 137 
crates/collab/src/tests/test_server.rs                          |  20 
crates/collab_ui/src/channel_view.rs                            |  52 
crates/collab_ui/src/chat_panel.rs                              |  46 
crates/collab_ui/src/collab_panel.rs                            | 201 
crates/gpui/Cargo.toml                                          |   2 
crates/gpui/src/app.rs                                          |   2 
crates/gpui/src/views/select.rs                                 |  14 
crates/rpc/proto/zed.proto                                      |  28 
crates/rpc/src/proto.rs                                         |   4 
crates/semantic_index/Cargo.toml                                |   2 
crates/sqlez/Cargo.toml                                         |   4 
crates/theme/src/theme.rs                                       |   3 
crates/workspace/Cargo.toml                                     |   2 
crates/zed/Cargo.toml                                           |   2 
styles/src/style_tree/collab_panel.ts                           |  15 
48 files changed, 2,503 insertions(+), 421 deletions(-)

Detailed changes

Cargo.lock 🔗

@@ -2,12 +2,6 @@
 # It is not intended for manual editing.
 version = 3
 
-[[package]]
-name = "Inflector"
-version = "0.11.4"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fe438c63458706e03479442743baae6c88256498e6431708f6dfc520a26515d3"
-
 [[package]]
 name = "activity_indicator"
 version = "0.1.0"
@@ -73,6 +67,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "2c99f64d1e06488f620f932677e24bc6e2897582980441ae90a671415bd7ec2f"
 dependencies = [
  "cfg-if 1.0.0",
+ "getrandom 0.2.10",
  "once_cell",
  "version_check",
 ]
@@ -99,7 +94,7 @@ dependencies = [
  "lazy_static",
  "log",
  "matrixmultiply",
- "ordered-float",
+ "ordered-float 2.10.0",
  "parking_lot 0.11.2",
  "parse_duration",
  "postage",
@@ -314,7 +309,7 @@ dependencies = [
  "language",
  "log",
  "menu",
- "ordered-float",
+ "ordered-float 2.10.0",
  "parking_lot 0.11.2",
  "project",
  "rand 0.8.5",
@@ -587,7 +582,7 @@ dependencies = [
  "futures-core",
  "futures-io",
  "rustls 0.19.1",
- "webpki 0.21.4",
+ "webpki",
  "webpki-roots 0.21.1",
 ]
 
@@ -618,9 +613,9 @@ dependencies = [
 
 [[package]]
 name = "atoi"
-version = "1.0.0"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d7c57d12312ff59c811c0643f4d80830505833c9ffaebd193d819392b265be8e"
+checksum = "f28d99ec8bfea296261ca1af174f24225171fea9664ba9003cbebee704810528"
 dependencies = [
  "num-traits",
 ]
@@ -778,19 +773,6 @@ dependencies = [
  "rustc-demangle",
 ]
 
-[[package]]
-name = "bae"
-version = "0.1.7"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "33b8de67cc41132507eeece2584804efcb15f85ba516e34c944b7667f480397a"
-dependencies = [
- "heck 0.3.3",
- "proc-macro-error",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
-]
-
 [[package]]
 name = "base64"
 version = "0.13.1"
@@ -809,6 +791,17 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
 
+[[package]]
+name = "bigdecimal"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a6773ddc0eafc0e509fb60e48dff7f450f8e674a0686ae8605e8d9901bd5eefa"
+dependencies = [
+ "num-bigint 0.4.4",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "bincode"
 version = "1.3.3"
@@ -1224,6 +1217,7 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "client",
+ "clock",
  "collections",
  "db",
  "feature_flags",
@@ -1518,7 +1512,6 @@ dependencies = [
  "rpc",
  "scrypt",
  "sea-orm",
- "sea-query",
  "serde",
  "serde_derive",
  "serde_json",
@@ -1539,6 +1532,7 @@ dependencies = [
  "tracing-subscriber",
  "unindent",
  "util",
+ "uuid 1.4.1",
  "workspace",
 ]
 
@@ -1659,6 +1653,12 @@ version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ed3d0b5ff30645a68f35ece8cea4556ca14ef8a1651455f789a099a0513532a6"
 
+[[package]]
+name = "const-oid"
+version = "0.9.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "28c122c3980598d243d63d9a704629a2d748d101f278052ff068be5a4423ab6f"
+
 [[package]]
 name = "context_menu"
 version = "0.1.0"
@@ -2151,6 +2151,17 @@ dependencies = [
  "byteorder",
 ]
 
+[[package]]
+name = "der"
+version = "0.7.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fffa369a668c8af7dbf8b5e56c9f744fbd399949ed171606040001947de40b1c"
+dependencies = [
+ "const-oid",
+ "pem-rfc7468",
+ "zeroize",
+]
+
 [[package]]
 name = "deranged"
 version = "0.3.8"
@@ -2160,6 +2171,17 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "derivative"
+version = "2.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fcc3dd5e9e9c0b295d6e1e4d811fb6f157d5ffd784b8d202fc62eac8035a770b"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
 [[package]]
 name = "derive_more"
 version = "0.99.17"
@@ -2245,6 +2267,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "9ed9a281f7bc9b7576e61468ba615a66a5c8cfdff42420a70aa82701a3b1e292"
 dependencies = [
  "block-buffer 0.10.4",
+ "const-oid",
  "crypto-common",
  "subtle",
 ]
@@ -2376,7 +2399,7 @@ dependencies = [
  "lazy_static",
  "log",
  "lsp",
- "ordered-float",
+ "ordered-float 2.10.0",
  "parking_lot 0.11.2",
  "postage",
  "project",
@@ -2408,6 +2431,9 @@ name = "either"
 version = "1.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "encoding_rs"
@@ -2510,6 +2536,17 @@ dependencies = [
  "svg_fmt",
 ]
 
+[[package]]
+name = "etcetera"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "136d1b5283a1ab77bd9257427ffd09d8667ced0570b6f938942bc7568ed5b943"
+dependencies = [
+ "cfg-if 1.0.0",
+ "home",
+ "windows-sys",
+]
+
 [[package]]
 name = "euclid"
 version = "0.22.9"
@@ -2681,13 +2718,12 @@ checksum = "7bad48618fdb549078c333a7a8528acb57af271d0433bdecd523eb620628364e"
 
 [[package]]
 name = "flume"
-version = "0.10.14"
+version = "0.11.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1657b4441c3403d9f7b3409e47575237dac27b1b5726df654a6ecbf92f0f7577"
+checksum = "55ac459de2512911e4b674ce33cf20befaba382d05b62b008afc1c8b57cbf181"
 dependencies = [
  "futures-core",
  "futures-sink",
- "pin-project",
  "spin 0.9.8",
 ]
 
@@ -2914,13 +2950,13 @@ dependencies = [
 
 [[package]]
 name = "futures-intrusive"
-version = "0.4.2"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a604f7a68fbf8103337523b1fadc8ade7361ee3f112f7c680ad179651616aed5"
+checksum = "1d930c203dd0b6ff06e0201a4a2fe9149b43c684fd4420555b26d21b1a02956f"
 dependencies = [
  "futures-core",
  "lock_api",
- "parking_lot 0.11.2",
+ "parking_lot 0.12.1",
 ]
 
 [[package]]
@@ -3174,7 +3210,7 @@ dependencies = [
  "metal",
  "num_cpus",
  "objc",
- "ordered-float",
+ "ordered-float 2.10.0",
  "parking",
  "parking_lot 0.11.2",
  "pathfinder_color",
@@ -3306,15 +3342,6 @@ dependencies = [
  "allocator-api2",
 ]
 
-[[package]]
-name = "hashlink"
-version = "0.7.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7249a3129cbc1ffccd74857f81464a323a152173cdb134e0fd81bc803b29facf"
-dependencies = [
- "hashbrown 0.11.2",
-]
-
 [[package]]
 name = "hashlink"
 version = "0.8.4"
@@ -3636,6 +3663,17 @@ version = "1.0.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bfa799dd5ed20a7e349f3b4639aa80d74549c81716d9ec4f994c9b5815598306"
 
+[[package]]
+name = "inherent"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ce243b1bfa62ffc028f1cc3b6034ec63d649f3031bc8a4fbbb004e1ac17d1f68"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.37",
+]
+
 [[package]]
 name = "install_cli"
 version = "0.1.0"
@@ -4087,9 +4125,9 @@ checksum = "f7012b1bbb0719e1097c47611d3898568c546d597c2e74d66f6087edd5233ff4"
 
 [[package]]
 name = "libsqlite3-sys"
-version = "0.24.2"
+version = "0.26.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "898745e570c7d0453cc1fbc4a701eb6c662ed54e8fec8b7d14be137ebeeb9d14"
+checksum = "afc22eff61b133b115c6e8c74e818c628d6d5e7a502afea6f64dee076dd94326"
 dependencies = [
  "cc",
  "pkg-config",
@@ -4769,6 +4807,23 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "num-bigint-dig"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dc84195820f291c7697304f3cbdadd1cb7199c0efc917ff5eafd71225c136151"
+dependencies = [
+ "byteorder",
+ "lazy_static",
+ "libm",
+ "num-integer",
+ "num-iter",
+ "num-traits",
+ "rand 0.8.5",
+ "smallvec",
+ "zeroize",
+]
+
 [[package]]
 name = "num-complex"
 version = "0.2.4"
@@ -5027,6 +5082,15 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "ordered-float"
+version = "3.9.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2a54938017eacd63036332b4ae5c8a49fc8c0c1d6d629893057e4f13609edd06"
+dependencies = [
+ "num-traits",
+]
+
 [[package]]
 name = "os_str_bytes"
 version = "6.5.1"
@@ -5035,25 +5099,26 @@ checksum = "4d5d9eb14b174ee9aa2ef96dc2b94637a2d4b6e7cb873c7e171f0c20c6cf3eac"
 
 [[package]]
 name = "ouroboros"
-version = "0.15.6"
+version = "0.17.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1358bd1558bd2a083fed428ffeda486fbfb323e698cdda7794259d592ca72db"
+checksum = "e2ba07320d39dfea882faa70554b4bd342a5f273ed59ba7c1c6b4c840492c954"
 dependencies = [
  "aliasable",
  "ouroboros_macro",
+ "static_assertions",
 ]
 
 [[package]]
 name = "ouroboros_macro"
-version = "0.15.6"
+version = "0.17.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5f7d21ccd03305a674437ee1248f3ab5d4b1db095cf1caf49f1713ddf61956b7"
+checksum = "ec4c6225c69b4ca778c0aea097321a64c421cf4577b331c61b229267edabb6f8"
 dependencies = [
- "Inflector",
+ "heck 0.4.1",
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
@@ -5064,7 +5129,7 @@ dependencies = [
  "fuzzy",
  "gpui",
  "language",
- "ordered-float",
+ "ordered-float 2.10.0",
  "picker",
  "postage",
  "settings",
@@ -5230,6 +5295,15 @@ dependencies = [
  "regex",
 ]
 
+[[package]]
+name = "pem-rfc7468"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "88b39c9bfcfc231068454382784bb460aae594343fb030d46e9f50a645418412"
+dependencies = [
+ "base64ct",
+]
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.0"
@@ -5307,6 +5381,27 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
+name = "pkcs1"
+version = "0.7.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c8ffb9f10fa047879315e6625af03c164b16962a5368d724ed16323b68ace47f"
+dependencies = [
+ "der",
+ "pkcs8",
+ "spki",
+]
+
+[[package]]
+name = "pkcs8"
+version = "0.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f950b2377845cebe5cf8b5165cb3cc1a5e0fa5cfa3e1f7f55707d8fd82e0a7b7"
+dependencies = [
+ "der",
+ "spki",
+]
+
 [[package]]
 name = "pkg-config"
 version = "0.3.27"
@@ -5598,7 +5693,7 @@ dependencies = [
  "gpui",
  "language",
  "lsp",
- "ordered-float",
+ "ordered-float 2.10.0",
  "picker",
  "postage",
  "project",
@@ -5949,7 +6044,7 @@ dependencies = [
  "fuzzy",
  "gpui",
  "language",
- "ordered-float",
+ "ordered-float 2.10.0",
  "picker",
  "postage",
  "settings",
@@ -6262,7 +6357,7 @@ dependencies = [
  "prost 0.8.0",
  "prost-build",
  "rand 0.8.5",
- "rsa",
+ "rsa 0.4.0",
  "serde",
  "serde_derive",
  "smol",
@@ -6275,14 +6370,14 @@ dependencies = [
 
 [[package]]
 name = "rsa"
-version = "0.4.1"
+version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "7b0aeddcca1082112a6eeb43bf25fd7820b066aaf6eaef776e19d0a1febe38fe"
+checksum = "68ef841a26fc5d040ced0417c6c6a64ee851f42489df11cdf0218e545b6f8d28"
 dependencies = [
  "byteorder",
  "digest 0.9.0",
  "lazy_static",
- "num-bigint-dig",
+ "num-bigint-dig 0.7.1",
  "num-integer",
  "num-iter",
  "num-traits",
@@ -6293,18 +6388,39 @@ dependencies = [
  "zeroize",
 ]
 
+[[package]]
+name = "rsa"
+version = "0.9.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6ab43bb47d23c1a631b4b680199a45255dce26fa9ab2fa902581f624ff13e6a8"
+dependencies = [
+ "byteorder",
+ "const-oid",
+ "digest 0.10.7",
+ "num-bigint-dig 0.8.4",
+ "num-integer",
+ "num-iter",
+ "num-traits",
+ "pkcs1",
+ "pkcs8",
+ "rand_core 0.6.4",
+ "signature",
+ "spki",
+ "subtle",
+ "zeroize",
+]
+
 [[package]]
 name = "rusqlite"
-version = "0.27.0"
+version = "0.29.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "85127183a999f7db96d1a976a309eebbfb6ea3b0b400ddd8340190129de6eb7a"
+checksum = "549b9d036d571d42e6e85d1c1425e2ac83491075078ca9a15be021c56b1641f2"
 dependencies = [
- "bitflags 1.3.2",
+ "bitflags 2.4.0",
  "fallible-iterator",
  "fallible-streaming-iterator",
- "hashlink 0.7.0",
+ "hashlink",
  "libsqlite3-sys",
- "memchr",
  "smallvec",
 ]
 
@@ -6433,19 +6549,18 @@ dependencies = [
  "log",
  "ring",
  "sct 0.6.1",
- "webpki 0.21.4",
+ "webpki",
 ]
 
 [[package]]
 name = "rustls"
-version = "0.20.9"
+version = "0.21.7"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b80e3dec595989ea8510028f30c408a4630db12c9cbb8de34203b89d6577e99"
+checksum = "cd8d6c9f025a446bc4d18ad9632e69aec8f287aa84499ee335599fabd20c3fd8"
 dependencies = [
- "log",
  "ring",
+ "rustls-webpki",
  "sct 0.7.0",
- "webpki 0.22.1",
 ]
 
 [[package]]
@@ -6457,6 +6572,16 @@ dependencies = [
  "base64 0.21.4",
 ]
 
+[[package]]
+name = "rustls-webpki"
+version = "0.101.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c7d5dece342910d9ba34d259310cae3e0154b873b35408b787b59bce53d34fe"
+dependencies = [
+ "ring",
+ "untrusted",
+]
+
 [[package]]
 name = "rustversion"
 version = "1.0.14"
@@ -6597,26 +6722,40 @@ dependencies = [
  "untrusted",
 ]
 
+[[package]]
+name = "sea-bae"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3bd3534a9978d0aa7edd2808dc1f8f31c4d0ecd31ddf71d997b3c98e9f3c9114"
+dependencies = [
+ "heck 0.4.1",
+ "proc-macro-error",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.37",
+]
+
 [[package]]
 name = "sea-orm"
-version = "0.10.5"
-source = "git+https://github.com/zed-industries/sea-orm?rev=18f4c691085712ad014a51792af75a9044bacee6#18f4c691085712ad014a51792af75a9044bacee6"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "da5b2d70c255bc5cbe1d49f69c3c8eadae0fbbaeb18ee978edbf2f75775cb94d"
 dependencies = [
  "async-stream",
  "async-trait",
+ "bigdecimal",
  "chrono",
  "futures 0.3.28",
- "futures-util",
  "log",
  "ouroboros",
  "rust_decimal",
  "sea-orm-macros",
  "sea-query",
  "sea-query-binder",
- "sea-strum",
  "serde",
  "serde_json",
  "sqlx",
+ "strum",
  "thiserror",
  "time",
  "tracing",
@@ -6626,25 +6765,30 @@ dependencies = [
 
 [[package]]
 name = "sea-orm-macros"
-version = "0.10.5"
-source = "git+https://github.com/zed-industries/sea-orm?rev=18f4c691085712ad014a51792af75a9044bacee6#18f4c691085712ad014a51792af75a9044bacee6"
+version = "0.12.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d7c8d455fad40194fb9774fdc4810c0f2700ff0dc0e93bd5ce9d641cc3f5dd75"
 dependencies = [
- "bae",
- "heck 0.3.3",
+ "heck 0.4.1",
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "sea-bae",
+ "syn 2.0.37",
+ "unicode-ident",
 ]
 
 [[package]]
 name = "sea-query"
-version = "0.27.2"
+version = "0.30.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a4f0fc4d8e44e1d51c739a68d336252a18bc59553778075d5e32649be6ec92ed"
+checksum = "fb3e6bba153bb198646c8762c48414942a38db27d142e44735a133cabddcc820"
 dependencies = [
+ "bigdecimal",
  "chrono",
+ "derivative",
+ "inherent",
+ "ordered-float 3.9.1",
  "rust_decimal",
- "sea-query-derive",
  "serde_json",
  "time",
  "uuid 1.4.1",
@@ -6652,10 +6796,11 @@ dependencies = [
 
 [[package]]
 name = "sea-query-binder"
-version = "0.2.2"
+version = "0.5.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9c2585b89c985cfacfe0ec9fc9e7bb055b776c1a2581c4e3c6185af2b8bf8865"
+checksum = "36bbb68df92e820e4d5aeb17b4acd5cc8b5d18b2c36a4dd6f4626aabfa7ab1b9"
 dependencies = [
+ "bigdecimal",
  "chrono",
  "rust_decimal",
  "sea-query",
@@ -6665,41 +6810,6 @@ dependencies = [
  "uuid 1.4.1",
 ]
 
-[[package]]
-name = "sea-query-derive"
-version = "0.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "34cdc022b4f606353fe5dc85b09713a04e433323b70163e81513b141c6ae6eb5"
-dependencies = [
- "heck 0.3.3",
- "proc-macro2",
- "quote",
- "syn 1.0.109",
- "thiserror",
-]
-
-[[package]]
-name = "sea-strum"
-version = "0.23.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "391d06a6007842cfe79ac6f7f53911b76dfd69fc9a6769f1cf6569d12ce20e1b"
-dependencies = [
- "sea-strum_macros",
-]
-
-[[package]]
-name = "sea-strum_macros"
-version = "0.23.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "69b4397b825df6ccf1e98bcdabef3bbcfc47ff5853983467850eeab878384f21"
-dependencies = [
- "heck 0.3.3",
- "proc-macro2",
- "quote",
- "rustversion",
- "syn 1.0.109",
-]
-
 [[package]]
 name = "seahash"
 version = "4.1.0"
@@ -6779,7 +6889,7 @@ dependencies = [
  "log",
  "ndarray",
  "node_runtime",
- "ordered-float",
+ "ordered-float 2.10.0",
  "parking_lot 0.11.2",
  "picker",
  "postage",
@@ -7077,6 +7187,16 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "signature"
+version = "2.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5e1788eed21689f9cf370582dfc467ef36ed9c707f073528ddafa8d83e3b8500"
+dependencies = [
+ "digest 0.10.7",
+ "rand_core 0.6.4",
+]
+
 [[package]]
 name = "simdutf8"
 version = "0.1.4"
@@ -7238,6 +7358,16 @@ dependencies = [
  "lock_api",
 ]
 
+[[package]]
+name = "spki"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9d1e996ef02c474957d681f1b05213dfb0abab947b446a62d37770b23500184a"
+dependencies = [
+ "base64ct",
+ "der",
+]
+
 [[package]]
 name = "spsc-buffer"
 version = "0.1.1"
@@ -7284,104 +7414,219 @@ dependencies = [
 
 [[package]]
 name = "sqlx"
-version = "0.6.3"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f8de3b03a925878ed54a954f621e64bf55a3c1bd29652d0d1a17830405350188"
+checksum = "0e50c216e3624ec8e7ecd14c6a6a6370aad6ee5d8cfc3ab30b5162eeeef2ed33"
 dependencies = [
  "sqlx-core",
  "sqlx-macros",
+ "sqlx-mysql",
+ "sqlx-postgres",
+ "sqlx-sqlite",
 ]
 
 [[package]]
 name = "sqlx-core"
-version = "0.6.3"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fa8241483a83a3f33aa5fff7e7d9def398ff9990b2752b6c6112b83c6d246029"
+checksum = "8d6753e460c998bbd4cd8c6f0ed9a64346fcca0723d6e75e52fdc351c5d2169d"
 dependencies = [
- "ahash 0.7.6",
+ "ahash 0.8.3",
  "atoi",
- "base64 0.13.1",
- "bitflags 1.3.2",
+ "bigdecimal",
  "byteorder",
  "bytes 1.5.0",
  "chrono",
  "crc",
  "crossbeam-queue",
- "dirs 4.0.0",
  "dotenvy",
  "either",
  "event-listener",
- "flume",
  "futures-channel",
  "futures-core",
- "futures-executor",
  "futures-intrusive",
+ "futures-io",
  "futures-util",
- "hashlink 0.8.4",
+ "hashlink",
  "hex",
- "hkdf",
- "hmac 0.12.1",
- "indexmap 1.9.3",
- "itoa",
- "libc",
- "libsqlite3-sys",
+ "indexmap 2.0.0",
  "log",
- "md-5",
  "memchr",
- "num-bigint 0.4.4",
  "once_cell",
  "paste",
  "percent-encoding",
- "rand 0.8.5",
  "rust_decimal",
- "rustls 0.20.9",
+ "rustls 0.21.7",
  "rustls-pemfile",
  "serde",
  "serde_json",
- "sha1",
  "sha2 0.10.7",
  "smallvec",
  "sqlformat",
- "sqlx-rt",
- "stringprep",
  "thiserror",
  "time",
+ "tokio",
  "tokio-stream",
+ "tracing",
  "url",
  "uuid 1.4.1",
- "webpki-roots 0.22.6",
- "whoami",
+ "webpki-roots 0.24.0",
 ]
 
 [[package]]
 name = "sqlx-macros"
-version = "0.6.3"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9a793bb3ba331ec8359c1853bd39eed32cdd7baaf22c35ccf5c92a7e8d1189ec"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "sqlx-core",
+ "sqlx-macros-core",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "sqlx-macros-core"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9966e64ae989e7e575b19d7265cb79d7fc3cbbdf179835cb0d716f294c2049c9"
+checksum = "0a4ee1e104e00dedb6aa5ffdd1343107b0a4702e862a84320ee7cc74782d96fc"
 dependencies = [
  "dotenvy",
  "either",
  "heck 0.4.1",
+ "hex",
  "once_cell",
  "proc-macro2",
  "quote",
+ "serde",
  "serde_json",
  "sha2 0.10.7",
  "sqlx-core",
- "sqlx-rt",
+ "sqlx-mysql",
+ "sqlx-postgres",
+ "sqlx-sqlite",
  "syn 1.0.109",
+ "tempfile",
+ "tokio",
  "url",
 ]
 
 [[package]]
-name = "sqlx-rt"
-version = "0.6.3"
+name = "sqlx-mysql"
+version = "0.7.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "804d3f245f894e61b1e6263c84b23ca675d96753b5abfd5cc8597d86806e8024"
+checksum = "864b869fdf56263f4c95c45483191ea0af340f9f3e3e7b4d57a61c7c87a970db"
 dependencies = [
+ "atoi",
+ "base64 0.21.4",
+ "bigdecimal",
+ "bitflags 2.4.0",
+ "byteorder",
+ "bytes 1.5.0",
+ "chrono",
+ "crc",
+ "digest 0.10.7",
+ "dotenvy",
+ "either",
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-util",
+ "generic-array",
+ "hex",
+ "hkdf",
+ "hmac 0.12.1",
+ "itoa",
+ "log",
+ "md-5",
+ "memchr",
  "once_cell",
- "tokio",
- "tokio-rustls",
+ "percent-encoding",
+ "rand 0.8.5",
+ "rsa 0.9.2",
+ "rust_decimal",
+ "serde",
+ "sha1",
+ "sha2 0.10.7",
+ "smallvec",
+ "sqlx-core",
+ "stringprep",
+ "thiserror",
+ "time",
+ "tracing",
+ "uuid 1.4.1",
+ "whoami",
+]
+
+[[package]]
+name = "sqlx-postgres"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "eb7ae0e6a97fb3ba33b23ac2671a5ce6e3cabe003f451abd5a56e7951d975624"
+dependencies = [
+ "atoi",
+ "base64 0.21.4",
+ "bigdecimal",
+ "bitflags 2.4.0",
+ "byteorder",
+ "chrono",
+ "crc",
+ "dotenvy",
+ "etcetera",
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-util",
+ "hex",
+ "hkdf",
+ "hmac 0.12.1",
+ "home",
+ "itoa",
+ "log",
+ "md-5",
+ "memchr",
+ "num-bigint 0.4.4",
+ "once_cell",
+ "rand 0.8.5",
+ "rust_decimal",
+ "serde",
+ "serde_json",
+ "sha1",
+ "sha2 0.10.7",
+ "smallvec",
+ "sqlx-core",
+ "stringprep",
+ "thiserror",
+ "time",
+ "tracing",
+ "uuid 1.4.1",
+ "whoami",
+]
+
+[[package]]
+name = "sqlx-sqlite"
+version = "0.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d59dc83cf45d89c555a577694534fcd1b55c545a816c816ce51f20bbe56a4f3f"
+dependencies = [
+ "atoi",
+ "chrono",
+ "flume",
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-intrusive",
+ "futures-util",
+ "libsqlite3-sys",
+ "log",
+ "percent-encoding",
+ "serde",
+ "sqlx-core",
+ "time",
+ "tracing",
+ "url",
+ "uuid 1.4.1",
 ]
 
 [[package]]
@@ -7712,7 +7957,7 @@ dependencies = [
  "lazy_static",
  "libc",
  "mio-extras",
- "ordered-float",
+ "ordered-float 2.10.0",
  "procinfo",
  "rand 0.8.5",
  "schemars",

Cargo.toml 🔗

@@ -105,6 +105,7 @@ rand = { version = "0.8.5" }
 refineable = { path = "./crates/refineable" }
 regex = { version = "1.5" }
 rust-embed = { version = "8.0", features = ["include-exclude"] }
+rusqlite = { version = "0.29.0", features = ["blob", "array", "modern_sqlite"] }
 schemars = { version = "0.8" }
 serde = { version = "1.0", features = ["derive", "rc"] }
 serde_derive = { version = "1.0", features = ["deserialize_in_place"] }
@@ -120,6 +121,7 @@ tree-sitter = "0.20"
 unindent = { version = "0.1.7" }
 pretty_assertions = "1.3.0"
 git2 = { version = "0.15", default-features = false}
+uuid = { version = "1.1.2", features = ["v4"] }
 
 tree-sitter-bash = { git = "https://github.com/tree-sitter/tree-sitter-bash", rev = "1b0321ee85701d5036c334a6f04761cdc672e64c" }
 tree-sitter-c = "0.20.1"

crates/ai/Cargo.toml 🔗

@@ -27,7 +27,7 @@ log.workspace = true
 parse_duration = "2.1.1"
 tiktoken-rs = "0.5.0"
 matrixmultiply = "0.3.7"
-rusqlite = { version = "0.27.0", features = ["blob", "array", "modern_sqlite"] }
+rusqlite = { version = "0.29.0", features = ["blob", "array", "modern_sqlite"] }
 bincode = "1.3.3"
 
 [dev-dependencies]

crates/assistant/Cargo.toml 🔗

@@ -21,8 +21,8 @@ search = { path = "../search" }
 settings = { path = "../settings" }
 theme = { path = "../theme" }
 util = { path = "../util" }
-uuid = { version = "1.1.2", features = ["v4"] }
 workspace = { path = "../workspace" }
+uuid.workspace = true
 
 anyhow.workspace = true
 chrono = { version = "0.4", features = ["serde"] }

crates/call/src/room.rs 🔗

@@ -104,6 +104,10 @@ impl Room {
         self.channel_id
     }
 
+    pub fn is_sharing_project(&self) -> bool {
+        !self.shared_projects.is_empty()
+    }
+
     #[cfg(any(test, feature = "test-support"))]
     pub fn is_connected(&self) -> bool {
         if let Some(live_kit) = self.live_kit.as_ref() {
@@ -594,9 +598,8 @@ impl Room {
             .map_or(&[], |v| v.as_slice())
     }
 
-    /// projects_to_join returns a list of shared projects sorted such
-    /// that the most 'active' projects appear last.
-    pub fn projects_to_join(&self) -> Vec<(u64, u64)> {
+    /// Returns the most 'active' projects, defined as most people in the project
+    pub fn most_active_project(&self) -> Option<(u64, u64)> {
         let mut projects = HashMap::default();
         let mut hosts = HashMap::default();
         for participant in self.remote_participants.values() {
@@ -613,12 +616,11 @@ impl Room {
         }
 
         let mut pairs: Vec<(u64, usize)> = projects.into_iter().collect();
-        pairs.sort_by_key(|(_, count)| 0 - *count as i32);
+        pairs.sort_by_key(|(_, count)| *count as i32);
 
         pairs
-            .into_iter()
-            .map(|(project_id, _)| (project_id, hosts[&project_id]))
-            .collect()
+            .first()
+            .map(|(project_id, _)| (*project_id, hosts[&project_id]))
     }
 
     async fn handle_room_updated(

crates/channel/Cargo.toml 🔗

@@ -23,6 +23,7 @@ language = { path = "../language" }
 settings = { path = "../settings" }
 feature_flags = { path = "../feature_flags" }
 sum_tree = { path = "../sum_tree" }
+clock = { path = "../clock" }
 
 anyhow.workspace = true
 futures.workspace = true
@@ -38,7 +39,7 @@ smol.workspace = true
 thiserror.workspace = true
 time.workspace = true
 tiny_http = "0.8"
-uuid = { version = "1.1.2", features = ["v4"] }
+uuid.workspace = true
 url = "2.2"
 serde.workspace = true
 serde_derive.workspace = true

crates/channel/src/channel.rs 🔗

@@ -2,7 +2,7 @@ mod channel_buffer;
 mod channel_chat;
 mod channel_store;
 
-pub use channel_buffer::{ChannelBuffer, ChannelBufferEvent};
+pub use channel_buffer::{ChannelBuffer, ChannelBufferEvent, ACKNOWLEDGE_DEBOUNCE_INTERVAL};
 pub use channel_chat::{ChannelChat, ChannelChatEvent, ChannelMessage, ChannelMessageId};
 pub use channel_store::{
     Channel, ChannelData, ChannelEvent, ChannelId, ChannelMembership, ChannelPath, ChannelStore,

crates/channel/src/channel_buffer.rs 🔗

@@ -2,14 +2,17 @@ use crate::Channel;
 use anyhow::Result;
 use client::{Client, Collaborator, UserStore};
 use collections::HashMap;
-use gpui::{AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle};
+use gpui::{AppContext, AsyncAppContext, Entity, ModelContext, ModelHandle, Task};
+use language::proto::serialize_version;
 use rpc::{
     proto::{self, PeerId},
     TypedEnvelope,
 };
-use std::sync::Arc;
+use std::{sync::Arc, time::Duration};
 use util::ResultExt;
 
+pub const ACKNOWLEDGE_DEBOUNCE_INTERVAL: Duration = Duration::from_millis(250);
+
 pub(crate) fn init(client: &Arc<Client>) {
     client.add_model_message_handler(ChannelBuffer::handle_update_channel_buffer);
     client.add_model_message_handler(ChannelBuffer::handle_update_channel_buffer_collaborators);
@@ -24,11 +27,13 @@ pub struct ChannelBuffer {
     buffer_epoch: u64,
     client: Arc<Client>,
     subscription: Option<client::Subscription>,
+    acknowledge_task: Option<Task<Result<()>>>,
 }
 
 pub enum ChannelBufferEvent {
     CollaboratorsChanged,
     Disconnected,
+    BufferEdited,
 }
 
 impl Entity for ChannelBuffer {
@@ -36,6 +41,9 @@ impl Entity for ChannelBuffer {
 
     fn release(&mut self, _: &mut AppContext) {
         if self.connected {
+            if let Some(task) = self.acknowledge_task.take() {
+                task.detach();
+            }
             self.client
                 .send(proto::LeaveChannelBuffer {
                     channel_id: self.channel.id,
@@ -81,6 +89,7 @@ impl ChannelBuffer {
                 client,
                 connected: true,
                 collaborators: Default::default(),
+                acknowledge_task: None,
                 channel,
                 subscription: Some(subscription.set_model(&cx.handle(), &mut cx.to_async())),
                 user_store,
@@ -159,19 +168,45 @@ impl ChannelBuffer {
         &mut self,
         _: ModelHandle<language::Buffer>,
         event: &language::Event,
-        _: &mut ModelContext<Self>,
+        cx: &mut ModelContext<Self>,
     ) {
-        if let language::Event::Operation(operation) = event {
-            let operation = language::proto::serialize_operation(operation);
-            self.client
-                .send(proto::UpdateChannelBuffer {
-                    channel_id: self.channel.id,
-                    operations: vec![operation],
-                })
-                .log_err();
+        match event {
+            language::Event::Operation(operation) => {
+                let operation = language::proto::serialize_operation(operation);
+                self.client
+                    .send(proto::UpdateChannelBuffer {
+                        channel_id: self.channel.id,
+                        operations: vec![operation],
+                    })
+                    .log_err();
+            }
+            language::Event::Edited => {
+                cx.emit(ChannelBufferEvent::BufferEdited);
+            }
+            _ => {}
         }
     }
 
+    pub fn acknowledge_buffer_version(&mut self, cx: &mut ModelContext<'_, ChannelBuffer>) {
+        let buffer = self.buffer.read(cx);
+        let version = buffer.version();
+        let buffer_id = buffer.remote_id();
+        let client = self.client.clone();
+        let epoch = self.epoch();
+
+        self.acknowledge_task = Some(cx.spawn_weak(|_, cx| async move {
+            cx.background().timer(ACKNOWLEDGE_DEBOUNCE_INTERVAL).await;
+            client
+                .send(proto::AckBufferOperation {
+                    buffer_id,
+                    epoch,
+                    version: serialize_version(&version),
+                })
+                .ok();
+            Ok(())
+        }));
+    }
+
     pub fn epoch(&self) -> u64 {
         self.buffer_epoch
     }

crates/channel/src/channel_chat.rs 🔗

@@ -1,4 +1,4 @@
-use crate::Channel;
+use crate::{Channel, ChannelId, ChannelStore};
 use anyhow::{anyhow, Result};
 use client::{
     proto,
@@ -16,7 +16,9 @@ use util::{post_inc, ResultExt as _, TryFutureExt};
 pub struct ChannelChat {
     channel: Arc<Channel>,
     messages: SumTree<ChannelMessage>,
+    channel_store: ModelHandle<ChannelStore>,
     loaded_all_messages: bool,
+    last_acknowledged_id: Option<u64>,
     next_pending_message_id: usize,
     user_store: ModelHandle<UserStore>,
     rpc: Arc<Client>,
@@ -55,6 +57,10 @@ pub enum ChannelChatEvent {
         old_range: Range<usize>,
         new_count: usize,
     },
+    NewMessage {
+        channel_id: ChannelId,
+        message_id: u64,
+    },
 }
 
 pub fn init(client: &Arc<Client>) {
@@ -77,6 +83,7 @@ impl Entity for ChannelChat {
 impl ChannelChat {
     pub async fn new(
         channel: Arc<Channel>,
+        channel_store: ModelHandle<ChannelStore>,
         user_store: ModelHandle<UserStore>,
         client: Arc<Client>,
         mut cx: AsyncAppContext,
@@ -94,11 +101,13 @@ impl ChannelChat {
             let mut this = Self {
                 channel,
                 user_store,
+                channel_store,
                 rpc: client,
                 outgoing_messages_lock: Default::default(),
                 messages: Default::default(),
                 loaded_all_messages,
                 next_pending_message_id: 0,
+                last_acknowledged_id: None,
                 rng: StdRng::from_entropy(),
                 _subscription: subscription.set_model(&cx.handle(), &mut cx.to_async()),
             };
@@ -219,6 +228,26 @@ impl ChannelChat {
         false
     }
 
+    pub fn acknowledge_last_message(&mut self, cx: &mut ModelContext<Self>) {
+        if let ChannelMessageId::Saved(latest_message_id) = self.messages.summary().max_id {
+            if self
+                .last_acknowledged_id
+                .map_or(true, |acknowledged_id| acknowledged_id < latest_message_id)
+            {
+                self.rpc
+                    .send(proto::AckChannelMessage {
+                        channel_id: self.channel.id,
+                        message_id: latest_message_id,
+                    })
+                    .ok();
+                self.last_acknowledged_id = Some(latest_message_id);
+                self.channel_store.update(cx, |store, cx| {
+                    store.acknowledge_message_id(self.channel.id, latest_message_id, cx);
+                });
+            }
+        }
+    }
+
     pub fn rejoin(&mut self, cx: &mut ModelContext<Self>) {
         let user_store = self.user_store.clone();
         let rpc = self.rpc.clone();
@@ -313,10 +342,15 @@ impl ChannelChat {
             .payload
             .message
             .ok_or_else(|| anyhow!("empty message"))?;
+        let message_id = message.id;
 
         let message = ChannelMessage::from_proto(message, &user_store, &mut cx).await?;
         this.update(&mut cx, |this, cx| {
-            this.insert_messages(SumTree::from_item(message, &()), cx)
+            this.insert_messages(SumTree::from_item(message, &()), cx);
+            cx.emit(ChannelChatEvent::NewMessage {
+                channel_id: this.channel.id,
+                message_id,
+            })
         });
 
         Ok(())
@@ -388,6 +422,7 @@ impl ChannelChat {
                 old_range: start_ix..end_ix,
                 new_count,
             });
+
             cx.notify();
         }
     }

crates/channel/src/channel_store.rs 🔗

@@ -43,6 +43,8 @@ pub type ChannelData = (Channel, ChannelPath);
 pub struct Channel {
     pub id: ChannelId,
     pub name: String,
+    pub unseen_note_version: Option<(u64, clock::Global)>,
+    pub unseen_message_id: Option<u64>,
 }
 
 #[derive(Debug, PartialEq, Eq, PartialOrd, Ord, Hash, Clone, Serialize, Deserialize)]
@@ -207,6 +209,64 @@ impl ChannelStore {
         )
     }
 
+    pub fn has_channel_buffer_changed(&self, channel_id: ChannelId) -> Option<bool> {
+        self.channel_index
+            .by_id()
+            .get(&channel_id)
+            .map(|channel| channel.unseen_note_version.is_some())
+    }
+
+    pub fn has_new_messages(&self, channel_id: ChannelId) -> Option<bool> {
+        self.channel_index
+            .by_id()
+            .get(&channel_id)
+            .map(|channel| channel.unseen_message_id.is_some())
+    }
+
+    pub fn notes_changed(
+        &mut self,
+        channel_id: ChannelId,
+        epoch: u64,
+        version: &clock::Global,
+        cx: &mut ModelContext<Self>,
+    ) {
+        self.channel_index.note_changed(channel_id, epoch, version);
+        cx.notify();
+    }
+
+    pub fn new_message(
+        &mut self,
+        channel_id: ChannelId,
+        message_id: u64,
+        cx: &mut ModelContext<Self>,
+    ) {
+        self.channel_index.new_message(channel_id, message_id);
+        cx.notify();
+    }
+
+    pub fn acknowledge_message_id(
+        &mut self,
+        channel_id: ChannelId,
+        message_id: u64,
+        cx: &mut ModelContext<Self>,
+    ) {
+        self.channel_index
+            .acknowledge_message_id(channel_id, message_id);
+        cx.notify();
+    }
+
+    pub fn acknowledge_notes_version(
+        &mut self,
+        channel_id: ChannelId,
+        epoch: u64,
+        version: &clock::Global,
+        cx: &mut ModelContext<Self>,
+    ) {
+        self.channel_index
+            .acknowledge_note_version(channel_id, epoch, version);
+        cx.notify();
+    }
+
     pub fn open_channel_chat(
         &mut self,
         channel_id: ChannelId,
@@ -214,10 +274,11 @@ impl ChannelStore {
     ) -> Task<Result<ModelHandle<ChannelChat>>> {
         let client = self.client.clone();
         let user_store = self.user_store.clone();
+        let this = cx.handle();
         self.open_channel_resource(
             channel_id,
             |this| &mut this.opened_chats,
-            |channel, cx| ChannelChat::new(channel, user_store, client, cx),
+            |channel, cx| ChannelChat::new(channel, this, user_store, client, cx),
             cx,
         )
     }
@@ -779,6 +840,8 @@ impl ChannelStore {
                     Arc::new(Channel {
                         id: channel.id,
                         name: channel.name,
+                        unseen_note_version: None,
+                        unseen_message_id: None,
                     }),
                 ),
             }
@@ -787,7 +850,9 @@ impl ChannelStore {
         let channels_changed = !payload.channels.is_empty()
             || !payload.delete_channels.is_empty()
             || !payload.insert_edge.is_empty()
-            || !payload.delete_edge.is_empty();
+            || !payload.delete_edge.is_empty()
+            || !payload.unseen_channel_messages.is_empty()
+            || !payload.unseen_channel_buffer_changes.is_empty();
 
         if channels_changed {
             if !payload.delete_channels.is_empty() {
@@ -814,6 +879,22 @@ impl ChannelStore {
                 index.insert(channel)
             }
 
+            for unseen_buffer_change in payload.unseen_channel_buffer_changes {
+                let version = language::proto::deserialize_version(&unseen_buffer_change.version);
+                index.note_changed(
+                    unseen_buffer_change.channel_id,
+                    unseen_buffer_change.epoch,
+                    &version,
+                );
+            }
+
+            for unseen_channel_message in payload.unseen_channel_messages {
+                index.new_messages(
+                    unseen_channel_message.channel_id,
+                    unseen_channel_message.message_id,
+                );
+            }
+
             for edge in payload.insert_edge {
                 index.insert_edge(edge.channel_id, edge.parent_id);
             }

crates/channel/src/channel_store/channel_index.rs 🔗

@@ -38,6 +38,43 @@ impl ChannelIndex {
             channels_by_id: &mut self.channels_by_id,
         }
     }
+
+    pub fn acknowledge_note_version(
+        &mut self,
+        channel_id: ChannelId,
+        epoch: u64,
+        version: &clock::Global,
+    ) {
+        if let Some(channel) = self.channels_by_id.get_mut(&channel_id) {
+            let channel = Arc::make_mut(channel);
+            if let Some((unseen_epoch, unseen_version)) = &channel.unseen_note_version {
+                if epoch > *unseen_epoch
+                    || epoch == *unseen_epoch && version.observed_all(unseen_version)
+                {
+                    channel.unseen_note_version = None;
+                }
+            }
+        }
+    }
+
+    pub fn acknowledge_message_id(&mut self, channel_id: ChannelId, message_id: u64) {
+        if let Some(channel) = self.channels_by_id.get_mut(&channel_id) {
+            let channel = Arc::make_mut(channel);
+            if let Some(unseen_message_id) = channel.unseen_message_id {
+                if message_id >= unseen_message_id {
+                    channel.unseen_message_id = None;
+                }
+            }
+        }
+    }
+
+    pub fn note_changed(&mut self, channel_id: ChannelId, epoch: u64, version: &clock::Global) {
+        insert_note_changed(&mut self.channels_by_id, channel_id, epoch, version);
+    }
+
+    pub fn new_message(&mut self, channel_id: ChannelId, message_id: u64) {
+        insert_new_message(&mut self.channels_by_id, channel_id, message_id)
+    }
 }
 
 impl Deref for ChannelIndex {
@@ -76,6 +113,14 @@ impl<'a> ChannelPathsInsertGuard<'a> {
         }
     }
 
+    pub fn note_changed(&mut self, channel_id: ChannelId, epoch: u64, version: &clock::Global) {
+        insert_note_changed(&mut self.channels_by_id, channel_id, epoch, &version);
+    }
+
+    pub fn new_messages(&mut self, channel_id: ChannelId, message_id: u64) {
+        insert_new_message(&mut self.channels_by_id, channel_id, message_id)
+    }
+
     pub fn insert(&mut self, channel_proto: proto::Channel) {
         if let Some(existing_channel) = self.channels_by_id.get_mut(&channel_proto.id) {
             Arc::make_mut(existing_channel).name = channel_proto.name;
@@ -85,6 +130,8 @@ impl<'a> ChannelPathsInsertGuard<'a> {
                 Arc::new(Channel {
                     id: channel_proto.id,
                     name: channel_proto.name,
+                    unseen_note_version: None,
+                    unseen_message_id: None,
                 }),
             );
             self.insert_root(channel_proto.id);
@@ -160,3 +207,32 @@ fn channel_path_sorting_key<'a>(
     path.iter()
         .map(|id| Some(channels_by_id.get(id)?.name.as_str()))
 }
+
+fn insert_note_changed(
+    channels_by_id: &mut BTreeMap<ChannelId, Arc<Channel>>,
+    channel_id: u64,
+    epoch: u64,
+    version: &clock::Global,
+) {
+    if let Some(channel) = channels_by_id.get_mut(&channel_id) {
+        let unseen_version = Arc::make_mut(channel)
+            .unseen_note_version
+            .get_or_insert((0, clock::Global::new()));
+        if epoch > unseen_version.0 {
+            *unseen_version = (epoch, version.clone());
+        } else {
+            unseen_version.1.join(&version);
+        }
+    }
+}
+
+fn insert_new_message(
+    channels_by_id: &mut BTreeMap<ChannelId, Arc<Channel>>,
+    channel_id: u64,
+    message_id: u64,
+) {
+    if let Some(channel) = channels_by_id.get_mut(&channel_id) {
+        let unseen_message_id = Arc::make_mut(channel).unseen_message_id.get_or_insert(0);
+        *unseen_message_id = message_id.max(*unseen_message_id);
+    }
+}

crates/client/Cargo.toml 🔗

@@ -41,8 +41,8 @@ tempfile = "3"
 thiserror.workspace = true
 time.workspace = true
 tiny_http = "0.8"
+uuid.workspace = true
 url = "2.2"
-uuid = { version = "1.1.2", features = ["v4"] }
 
 [dev-dependencies]
 collections = { path = "../collections", features = ["test-support"] }

crates/client/src/client.rs 🔗

@@ -34,7 +34,7 @@ use std::{
     future::Future,
     marker::PhantomData,
     path::PathBuf,
-    sync::{Arc, Weak},
+    sync::{atomic::AtomicU64, Arc, Weak},
     time::{Duration, Instant},
 };
 use telemetry::Telemetry;
@@ -105,7 +105,7 @@ pub fn init(client: &Arc<Client>, cx: &mut AppContext) {
 }
 
 pub struct Client {
-    id: usize,
+    id: AtomicU64,
     peer: Arc<Peer>,
     http: Arc<dyn HttpClient>,
     telemetry: Arc<Telemetry>,
@@ -374,7 +374,7 @@ impl settings::Setting for TelemetrySettings {
 impl Client {
     pub fn new(http: Arc<dyn HttpClient>, cx: &AppContext) -> Arc<Self> {
         Arc::new(Self {
-            id: 0,
+            id: AtomicU64::new(0),
             peer: Peer::new(0),
             telemetry: Telemetry::new(http.clone(), cx),
             http,
@@ -387,17 +387,16 @@ impl Client {
         })
     }
 
-    pub fn id(&self) -> usize {
-        self.id
+    pub fn id(&self) -> u64 {
+        self.id.load(std::sync::atomic::Ordering::SeqCst)
     }
 
     pub fn http_client(&self) -> Arc<dyn HttpClient> {
         self.http.clone()
     }
 
-    #[cfg(any(test, feature = "test-support"))]
-    pub fn set_id(&mut self, id: usize) -> &Self {
-        self.id = id;
+    pub fn set_id(&self, id: u64) -> &Self {
+        self.id.store(id, std::sync::atomic::Ordering::SeqCst);
         self
     }
 
@@ -454,7 +453,7 @@ impl Client {
     }
 
     fn set_status(self: &Arc<Self>, status: Status, cx: &AsyncAppContext) {
-        log::info!("set status on client {}: {:?}", self.id, status);
+        log::info!("set status on client {}: {:?}", self.id(), status);
         let mut state = self.state.write();
         *state.status.0.borrow_mut() = status;
 
@@ -805,6 +804,7 @@ impl Client {
             }
         }
         let credentials = credentials.unwrap();
+        self.set_id(credentials.user_id);
 
         if was_disconnected {
             self.set_status(Status::Connecting, cx);
@@ -1221,7 +1221,7 @@ impl Client {
     }
 
     pub fn send<T: EnvelopedMessage>(&self, message: T) -> Result<()> {
-        log::debug!("rpc send. client_id:{}, name:{}", self.id, T::NAME);
+        log::debug!("rpc send. client_id:{}, name:{}", self.id(), T::NAME);
         self.peer.send(self.connection_id()?, message)
     }
 
@@ -1237,7 +1237,7 @@ impl Client {
         &self,
         request: T,
     ) -> impl Future<Output = Result<TypedEnvelope<T::Response>>> {
-        let client_id = self.id;
+        let client_id = self.id();
         log::debug!(
             "rpc request start. client_id:{}. name:{}",
             client_id,
@@ -1258,7 +1258,7 @@ impl Client {
     }
 
     fn respond<T: RequestMessage>(&self, receipt: Receipt<T>, response: T::Response) -> Result<()> {
-        log::debug!("rpc respond. client_id:{}. name:{}", self.id, T::NAME);
+        log::debug!("rpc respond. client_id:{}. name:{}", self.id(), T::NAME);
         self.peer.respond(receipt, response)
     }
 
@@ -1267,7 +1267,7 @@ impl Client {
         receipt: Receipt<T>,
         error: proto::Error,
     ) -> Result<()> {
-        log::debug!("rpc respond. client_id:{}. name:{}", self.id, T::NAME);
+        log::debug!("rpc respond. client_id:{}. name:{}", self.id(), T::NAME);
         self.peer.respond_with_error(receipt, error)
     }
 
@@ -1336,7 +1336,7 @@ impl Client {
 
         if let Some(handler) = handler {
             let future = handler(subscriber, message, &self, cx.clone());
-            let client_id = self.id;
+            let client_id = self.id();
             log::debug!(
                 "rpc message received. client_id:{}, sender_id:{:?}, type:{}",
                 client_id,

crates/collab/Cargo.toml 🔗

@@ -42,14 +42,12 @@ rand.workspace = true
 reqwest = { version = "0.11", features = ["json"], optional = true }
 scrypt = "0.7"
 smallvec.workspace = true
-# Remove fork dependency when a version with https://github.com/SeaQL/sea-orm/pull/1283 is released.
-sea-orm = { git = "https://github.com/zed-industries/sea-orm", rev = "18f4c691085712ad014a51792af75a9044bacee6", features = ["sqlx-postgres", "postgres-array", "runtime-tokio-rustls"] }
-sea-query = "0.27"
+sea-orm = { version = "0.12.x", features = ["sqlx-postgres", "postgres-array", "runtime-tokio-rustls", "with-uuid"] }
 serde.workspace = true
 serde_derive.workspace = true
 serde_json.workspace = true
 sha-1 = "0.9"
-sqlx = { version = "0.6", features = ["runtime-tokio-rustls", "postgres", "json", "time", "uuid", "any"] }
+sqlx = { version = "0.7", features = ["runtime-tokio-rustls", "postgres", "json", "time", "uuid", "any"] }
 time.workspace = true
 tokio = { version = "1", features = ["full"] }
 tokio-tungstenite = "0.17"
@@ -59,6 +57,7 @@ toml.workspace = true
 tracing = "0.1.34"
 tracing-log = "0.1.3"
 tracing-subscriber = { version = "0.3.11", features = ["env-filter", "json"] }
+uuid.workspace = true
 
 [dev-dependencies]
 audio = { path = "../audio" }
@@ -87,9 +86,9 @@ env_logger.workspace = true
 indoc.workspace = true
 util = { path = "../util" }
 lazy_static.workspace = true
-sea-orm = { git = "https://github.com/zed-industries/sea-orm", rev = "18f4c691085712ad014a51792af75a9044bacee6", features = ["sqlx-sqlite"] }
+sea-orm = { version = "0.12.x", features = ["sqlx-sqlite"] }
 serde_json.workspace = true
-sqlx = { version = "0.6", features = ["sqlite"] }
+sqlx = { version = "0.7", features = ["sqlite"] }
 unindent.workspace = true
 
 [features]

crates/collab/migrations.sqlite/20221109000000_test_schema.sql 🔗

@@ -289,3 +289,24 @@ CREATE TABLE "user_features" (
 CREATE UNIQUE INDEX "index_user_features_user_id_and_feature_id" ON "user_features" ("user_id", "feature_id");
 CREATE INDEX "index_user_features_on_user_id" ON "user_features" ("user_id");
 CREATE INDEX "index_user_features_on_feature_id" ON "user_features" ("feature_id");
+
+
+CREATE TABLE "observed_buffer_edits" (
+    "user_id" INTEGER NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+    "buffer_id" INTEGER NOT NULL REFERENCES buffers (id) ON DELETE CASCADE,
+    "epoch" INTEGER NOT NULL,
+    "lamport_timestamp" INTEGER NOT NULL,
+    "replica_id" INTEGER NOT NULL,
+    PRIMARY KEY (user_id, buffer_id)
+);
+
+CREATE UNIQUE INDEX "index_observed_buffers_user_and_buffer_id" ON "observed_buffer_edits" ("user_id", "buffer_id");
+
+CREATE TABLE IF NOT EXISTS "observed_channel_messages" (
+    "user_id" INTEGER NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+    "channel_id" INTEGER NOT NULL REFERENCES channels (id) ON DELETE CASCADE,
+    "channel_message_id" INTEGER NOT NULL,
+    PRIMARY KEY (user_id, channel_id)
+);
+
+CREATE UNIQUE INDEX "index_observed_channel_messages_user_and_channel_id" ON "observed_channel_messages" ("user_id", "channel_id");

crates/collab/migrations/20230925210437_add_channel_changes.sql 🔗

@@ -0,0 +1,19 @@
+CREATE TABLE IF NOT EXISTS "observed_buffer_edits" (
+    "user_id" INTEGER NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+    "buffer_id" INTEGER NOT NULL REFERENCES buffers (id) ON DELETE CASCADE,
+    "epoch" INTEGER NOT NULL,
+    "lamport_timestamp" INTEGER NOT NULL,
+    "replica_id" INTEGER NOT NULL,
+    PRIMARY KEY (user_id, buffer_id)
+);
+
+CREATE UNIQUE INDEX "index_observed_buffer_user_and_buffer_id" ON "observed_buffer_edits" ("user_id", "buffer_id");
+
+CREATE TABLE IF NOT EXISTS "observed_channel_messages" (
+    "user_id" INTEGER NOT NULL REFERENCES users (id) ON DELETE CASCADE,
+    "channel_id" INTEGER NOT NULL REFERENCES channels (id) ON DELETE CASCADE,
+    "channel_message_id" INTEGER NOT NULL,
+    PRIMARY KEY (user_id, channel_id)
+);
+
+CREATE UNIQUE INDEX "index_observed_channel_messages_user_and_channel_id" ON "observed_channel_messages" ("user_id", "channel_id");

crates/collab/src/db.rs 🔗

@@ -19,11 +19,12 @@ use rpc::{
     ConnectionId,
 };
 use sea_orm::{
-    entity::prelude::*, ActiveValue, Condition, ConnectionTrait, DatabaseConnection,
-    DatabaseTransaction, DbErr, FromQueryResult, IntoActiveModel, IsolationLevel, JoinType,
-    QueryOrder, QuerySelect, Statement, TransactionTrait,
+    entity::prelude::*,
+    sea_query::{Alias, Expr, OnConflict, Query},
+    ActiveValue, Condition, ConnectionTrait, DatabaseConnection, DatabaseTransaction, DbErr,
+    FromQueryResult, IntoActiveModel, IsolationLevel, JoinType, QueryOrder, QuerySelect, Statement,
+    TransactionTrait,
 };
-use sea_query::{Alias, Expr, OnConflict, Query};
 use serde::{Deserialize, Serialize};
 use sqlx::{
     migrate::{Migrate, Migration, MigrationSource},
@@ -62,6 +63,7 @@ pub struct Database {
 // separate files in the `queries` folder.
 impl Database {
     pub async fn new(options: ConnectOptions, executor: Executor) -> Result<Self> {
+        sqlx::any::install_default_drivers();
         Ok(Self {
             options: options.clone(),
             pool: sea_orm::Database::connect(options).await?,
@@ -119,7 +121,7 @@ impl Database {
         Ok(new_migrations)
     }
 
-    async fn transaction<F, Fut, T>(&self, f: F) -> Result<T>
+    pub async fn transaction<F, Fut, T>(&self, f: F) -> Result<T>
     where
         F: Send + Fn(TransactionHandle) -> Fut,
         Fut: Send + Future<Output = Result<T>>,
@@ -321,7 +323,7 @@ fn is_serialization_error(error: &Error) -> bool {
     }
 }
 
-struct TransactionHandle(Arc<Option<DatabaseTransaction>>);
+pub struct TransactionHandle(Arc<Option<DatabaseTransaction>>);
 
 impl Deref for TransactionHandle {
     type Target = DatabaseTransaction;
@@ -437,6 +439,8 @@ pub struct ChannelsForUser {
     pub channels: ChannelGraph,
     pub channel_participants: HashMap<ChannelId, Vec<UserId>>,
     pub channels_with_admin_privileges: HashSet<ChannelId>,
+    pub unseen_buffer_changes: Vec<proto::UnseenChannelBufferChange>,
+    pub channel_messages: Vec<proto::UnseenChannelMessage>,
 }
 
 #[derive(Debug)]

crates/collab/src/db/ids.rs 🔗

@@ -1,6 +1,5 @@
 use crate::Result;
-use sea_orm::DbErr;
-use sea_query::{Value, ValueTypeErr};
+use sea_orm::{entity::prelude::*, DbErr};
 use serde::{Deserialize, Serialize};
 
 macro_rules! id_type {
@@ -17,6 +16,7 @@ macro_rules! id_type {
             Hash,
             Serialize,
             Deserialize,
+            DeriveValueType,
         )]
         #[serde(transparent)]
         pub struct $name(pub i32);
@@ -42,40 +42,6 @@ macro_rules! id_type {
             }
         }
 
-        impl From<$name> for sea_query::Value {
-            fn from(value: $name) -> Self {
-                sea_query::Value::Int(Some(value.0))
-            }
-        }
-
-        impl sea_orm::TryGetable for $name {
-            fn try_get(
-                res: &sea_orm::QueryResult,
-                pre: &str,
-                col: &str,
-            ) -> Result<Self, sea_orm::TryGetError> {
-                Ok(Self(i32::try_get(res, pre, col)?))
-            }
-        }
-
-        impl sea_query::ValueType for $name {
-            fn try_from(v: Value) -> Result<Self, sea_query::ValueTypeErr> {
-                Ok(Self(value_to_integer(v)?))
-            }
-
-            fn type_name() -> String {
-                stringify!($name).into()
-            }
-
-            fn array_type() -> sea_query::ArrayType {
-                sea_query::ArrayType::Int
-            }
-
-            fn column_type() -> sea_query::ColumnType {
-                sea_query::ColumnType::Integer(None)
-            }
-        }
-
         impl sea_orm::TryFromU64 for $name {
             fn try_from_u64(n: u64) -> Result<Self, DbErr> {
                 Ok(Self(n.try_into().map_err(|_| {
@@ -88,7 +54,7 @@ macro_rules! id_type {
             }
         }
 
-        impl sea_query::Nullable for $name {
+        impl sea_orm::sea_query::Nullable for $name {
             fn null() -> Value {
                 Value::Int(None)
             }
@@ -96,20 +62,6 @@ macro_rules! id_type {
     };
 }
 
-fn value_to_integer(v: Value) -> Result<i32, ValueTypeErr> {
-    match v {
-        Value::TinyInt(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        Value::SmallInt(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        Value::Int(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        Value::BigInt(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        Value::TinyUnsigned(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        Value::SmallUnsigned(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        Value::Unsigned(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        Value::BigUnsigned(Some(int)) => int.try_into().map_err(|_| ValueTypeErr),
-        _ => Err(ValueTypeErr),
-    }
-}
-
 id_type!(BufferId);
 id_type!(AccessTokenId);
 id_type!(ChannelChatParticipantId);

crates/collab/src/db/queries.rs 🔗

@@ -9,3 +9,13 @@ pub mod projects;
 pub mod rooms;
 pub mod servers;
 pub mod users;
+
+fn max_assign<T: Ord>(max: &mut Option<T>, val: T) {
+    if let Some(max_val) = max {
+        if val > *max_val {
+            *max = Some(val);
+        }
+    } else {
+        *max = Some(val);
+    }
+}

crates/collab/src/db/queries/buffers.rs 🔗

@@ -74,7 +74,32 @@ impl Database {
             .await?;
             collaborators.push(collaborator);
 
-            let (base_text, operations) = self.get_buffer_state(&buffer, &tx).await?;
+            let (base_text, operations, max_operation) =
+                self.get_buffer_state(&buffer, &tx).await?;
+
+            // Save the last observed operation
+            if let Some(op) = max_operation {
+                observed_buffer_edits::Entity::insert(observed_buffer_edits::ActiveModel {
+                    user_id: ActiveValue::Set(user_id),
+                    buffer_id: ActiveValue::Set(buffer.id),
+                    epoch: ActiveValue::Set(op.epoch),
+                    lamport_timestamp: ActiveValue::Set(op.lamport_timestamp),
+                    replica_id: ActiveValue::Set(op.replica_id),
+                })
+                .on_conflict(
+                    OnConflict::columns([
+                        observed_buffer_edits::Column::UserId,
+                        observed_buffer_edits::Column::BufferId,
+                    ])
+                    .update_columns([
+                        observed_buffer_edits::Column::Epoch,
+                        observed_buffer_edits::Column::LamportTimestamp,
+                    ])
+                    .to_owned(),
+                )
+                .exec(&*tx)
+                .await?;
+            }
 
             Ok(proto::JoinChannelBufferResponse {
                 buffer_id: buffer.id.to_proto(),
@@ -373,33 +398,46 @@ impl Database {
         channel_id: ChannelId,
     ) -> Result<Vec<UserId>> {
         self.transaction(|tx| async move {
-            #[derive(Debug, Clone, Copy, EnumIter, DeriveColumn)]
-            enum QueryUserIds {
-                UserId,
-            }
-
-            let users: Vec<UserId> = channel_buffer_collaborator::Entity::find()
-                .select_only()
-                .column(channel_buffer_collaborator::Column::UserId)
-                .filter(
-                    Condition::all()
-                        .add(channel_buffer_collaborator::Column::ChannelId.eq(channel_id)),
-                )
-                .into_values::<_, QueryUserIds>()
-                .all(&*tx)
-                .await?;
-
-            Ok(users)
+            self.get_channel_buffer_collaborators_internal(channel_id, &*tx)
+                .await
         })
         .await
     }
 
+    async fn get_channel_buffer_collaborators_internal(
+        &self,
+        channel_id: ChannelId,
+        tx: &DatabaseTransaction,
+    ) -> Result<Vec<UserId>> {
+        #[derive(Debug, Clone, Copy, EnumIter, DeriveColumn)]
+        enum QueryUserIds {
+            UserId,
+        }
+
+        let users: Vec<UserId> = channel_buffer_collaborator::Entity::find()
+            .select_only()
+            .column(channel_buffer_collaborator::Column::UserId)
+            .filter(
+                Condition::all().add(channel_buffer_collaborator::Column::ChannelId.eq(channel_id)),
+            )
+            .into_values::<_, QueryUserIds>()
+            .all(&*tx)
+            .await?;
+
+        Ok(users)
+    }
+
     pub async fn update_channel_buffer(
         &self,
         channel_id: ChannelId,
         user: UserId,
         operations: &[proto::Operation],
-    ) -> Result<Vec<ConnectionId>> {
+    ) -> Result<(
+        Vec<ConnectionId>,
+        Vec<UserId>,
+        i32,
+        Vec<proto::VectorClockEntry>,
+    )> {
         self.transaction(move |tx| async move {
             self.check_user_is_channel_member(channel_id, user, &*tx)
                 .await?;
@@ -418,7 +456,38 @@ impl Database {
                 .iter()
                 .filter_map(|op| operation_to_storage(op, &buffer, serialization_version))
                 .collect::<Vec<_>>();
+
+            let mut channel_members;
+            let max_version;
+
             if !operations.is_empty() {
+                let max_operation = operations
+                    .iter()
+                    .max_by_key(|op| (op.lamport_timestamp.as_ref(), op.replica_id.as_ref()))
+                    .unwrap();
+
+                max_version = vec![proto::VectorClockEntry {
+                    replica_id: *max_operation.replica_id.as_ref() as u32,
+                    timestamp: *max_operation.lamport_timestamp.as_ref() as u32,
+                }];
+
+                // get current channel participants and save the max operation above
+                self.save_max_operation(
+                    user,
+                    buffer.id,
+                    buffer.epoch,
+                    *max_operation.replica_id.as_ref(),
+                    *max_operation.lamport_timestamp.as_ref(),
+                    &*tx,
+                )
+                .await?;
+
+                channel_members = self.get_channel_members_internal(channel_id, &*tx).await?;
+                let collaborators = self
+                    .get_channel_buffer_collaborators_internal(channel_id, &*tx)
+                    .await?;
+                channel_members.retain(|member| !collaborators.contains(member));
+
                 buffer_operation::Entity::insert_many(operations)
                     .on_conflict(
                         OnConflict::columns([
@@ -432,6 +501,9 @@ impl Database {
                     )
                     .exec(&*tx)
                     .await?;
+            } else {
+                channel_members = Vec::new();
+                max_version = Vec::new();
             }
 
             let mut connections = Vec::new();
@@ -450,11 +522,53 @@ impl Database {
                 });
             }
 
-            Ok(connections)
+            Ok((connections, channel_members, buffer.epoch, max_version))
         })
         .await
     }
 
+    async fn save_max_operation(
+        &self,
+        user_id: UserId,
+        buffer_id: BufferId,
+        epoch: i32,
+        replica_id: i32,
+        lamport_timestamp: i32,
+        tx: &DatabaseTransaction,
+    ) -> Result<()> {
+        use observed_buffer_edits::Column;
+
+        observed_buffer_edits::Entity::insert(observed_buffer_edits::ActiveModel {
+            user_id: ActiveValue::Set(user_id),
+            buffer_id: ActiveValue::Set(buffer_id),
+            epoch: ActiveValue::Set(epoch),
+            replica_id: ActiveValue::Set(replica_id),
+            lamport_timestamp: ActiveValue::Set(lamport_timestamp),
+        })
+        .on_conflict(
+            OnConflict::columns([Column::UserId, Column::BufferId])
+                .update_columns([Column::Epoch, Column::LamportTimestamp, Column::ReplicaId])
+                .action_cond_where(
+                    Condition::any().add(Column::Epoch.lt(epoch)).add(
+                        Condition::all().add(Column::Epoch.eq(epoch)).add(
+                            Condition::any()
+                                .add(Column::LamportTimestamp.lt(lamport_timestamp))
+                                .add(
+                                    Column::LamportTimestamp
+                                        .eq(lamport_timestamp)
+                                        .and(Column::ReplicaId.lt(replica_id)),
+                                ),
+                        ),
+                    ),
+                )
+                .to_owned(),
+        )
+        .exec_without_returning(tx)
+        .await?;
+
+        Ok(())
+    }
+
     async fn get_buffer_operation_serialization_version(
         &self,
         buffer_id: BufferId,
@@ -472,7 +586,7 @@ impl Database {
             .ok_or_else(|| anyhow!("missing buffer snapshot"))?)
     }
 
-    async fn get_channel_buffer(
+    pub async fn get_channel_buffer(
         &self,
         channel_id: ChannelId,
         tx: &DatabaseTransaction,
@@ -491,7 +605,11 @@ impl Database {
         &self,
         buffer: &buffer::Model,
         tx: &DatabaseTransaction,
-    ) -> Result<(String, Vec<proto::Operation>)> {
+    ) -> Result<(
+        String,
+        Vec<proto::Operation>,
+        Option<buffer_operation::Model>,
+    )> {
         let id = buffer.id;
         let (base_text, version) = if buffer.epoch > 0 {
             let snapshot = buffer_snapshot::Entity::find()
@@ -516,16 +634,28 @@ impl Database {
                     .eq(id)
                     .and(buffer_operation::Column::Epoch.eq(buffer.epoch)),
             )
+            .order_by_asc(buffer_operation::Column::LamportTimestamp)
+            .order_by_asc(buffer_operation::Column::ReplicaId)
             .stream(&*tx)
             .await?;
+
         let mut operations = Vec::new();
+        let mut last_row = None;
         while let Some(row) = rows.next().await {
+            let row = row?;
+            last_row = Some(buffer_operation::Model {
+                buffer_id: row.buffer_id,
+                epoch: row.epoch,
+                lamport_timestamp: row.lamport_timestamp,
+                replica_id: row.lamport_timestamp,
+                value: Default::default(),
+            });
             operations.push(proto::Operation {
-                variant: Some(operation_from_storage(row?, version)?),
-            })
+                variant: Some(operation_from_storage(row, version)?),
+            });
         }
 
-        Ok((base_text, operations))
+        Ok((base_text, operations, last_row))
     }
 
     async fn snapshot_channel_buffer(
@@ -534,7 +664,7 @@ impl Database {
         tx: &DatabaseTransaction,
     ) -> Result<()> {
         let buffer = self.get_channel_buffer(channel_id, tx).await?;
-        let (base_text, operations) = self.get_buffer_state(&buffer, tx).await?;
+        let (base_text, operations, _) = self.get_buffer_state(&buffer, tx).await?;
         if operations.is_empty() {
             return Ok(());
         }
@@ -567,6 +697,150 @@ impl Database {
 
         Ok(())
     }
+
+    pub async fn observe_buffer_version(
+        &self,
+        buffer_id: BufferId,
+        user_id: UserId,
+        epoch: i32,
+        version: &[proto::VectorClockEntry],
+    ) -> Result<()> {
+        self.transaction(|tx| async move {
+            // For now, combine concurrent operations.
+            let Some(component) = version.iter().max_by_key(|version| version.timestamp) else {
+                return Ok(());
+            };
+            self.save_max_operation(
+                user_id,
+                buffer_id,
+                epoch,
+                component.replica_id as i32,
+                component.timestamp as i32,
+                &*tx,
+            )
+            .await?;
+            Ok(())
+        })
+        .await
+    }
+
+    pub async fn unseen_channel_buffer_changes(
+        &self,
+        user_id: UserId,
+        channel_ids: &[ChannelId],
+        tx: &DatabaseTransaction,
+    ) -> Result<Vec<proto::UnseenChannelBufferChange>> {
+        #[derive(Debug, Clone, Copy, EnumIter, DeriveColumn)]
+        enum QueryIds {
+            ChannelId,
+            Id,
+        }
+
+        let mut channel_ids_by_buffer_id = HashMap::default();
+        let mut rows = buffer::Entity::find()
+            .filter(buffer::Column::ChannelId.is_in(channel_ids.iter().copied()))
+            .stream(&*tx)
+            .await?;
+        while let Some(row) = rows.next().await {
+            let row = row?;
+            channel_ids_by_buffer_id.insert(row.id, row.channel_id);
+        }
+        drop(rows);
+
+        let mut observed_edits_by_buffer_id = HashMap::default();
+        let mut rows = observed_buffer_edits::Entity::find()
+            .filter(observed_buffer_edits::Column::UserId.eq(user_id))
+            .filter(
+                observed_buffer_edits::Column::BufferId
+                    .is_in(channel_ids_by_buffer_id.keys().copied()),
+            )
+            .stream(&*tx)
+            .await?;
+        while let Some(row) = rows.next().await {
+            let row = row?;
+            observed_edits_by_buffer_id.insert(row.buffer_id, row);
+        }
+        drop(rows);
+
+        let latest_operations = self
+            .get_latest_operations_for_buffers(channel_ids_by_buffer_id.keys().copied(), &*tx)
+            .await?;
+
+        let mut changes = Vec::default();
+        for latest in latest_operations {
+            if let Some(observed) = observed_edits_by_buffer_id.get(&latest.buffer_id) {
+                if (
+                    observed.epoch,
+                    observed.lamport_timestamp,
+                    observed.replica_id,
+                ) >= (latest.epoch, latest.lamport_timestamp, latest.replica_id)
+                {
+                    continue;
+                }
+            }
+
+            if let Some(channel_id) = channel_ids_by_buffer_id.get(&latest.buffer_id) {
+                changes.push(proto::UnseenChannelBufferChange {
+                    channel_id: channel_id.to_proto(),
+                    epoch: latest.epoch as u64,
+                    version: vec![proto::VectorClockEntry {
+                        replica_id: latest.replica_id as u32,
+                        timestamp: latest.lamport_timestamp as u32,
+                    }],
+                });
+            }
+        }
+
+        Ok(changes)
+    }
+
+    pub async fn get_latest_operations_for_buffers(
+        &self,
+        buffer_ids: impl IntoIterator<Item = BufferId>,
+        tx: &DatabaseTransaction,
+    ) -> Result<Vec<buffer_operation::Model>> {
+        let mut values = String::new();
+        for id in buffer_ids {
+            if !values.is_empty() {
+                values.push_str(", ");
+            }
+            write!(&mut values, "({})", id).unwrap();
+        }
+
+        if values.is_empty() {
+            return Ok(Vec::default());
+        }
+
+        let sql = format!(
+            r#"
+            SELECT
+                *
+            FROM
+            (
+                SELECT
+                    *,
+                    row_number() OVER (
+                        PARTITION BY buffer_id
+                        ORDER BY
+                            epoch DESC,
+                            lamport_timestamp DESC,
+                            replica_id DESC
+                    ) as row_number
+                FROM buffer_operations
+                WHERE
+                    buffer_id in ({values})
+            ) AS last_operations
+            WHERE
+                row_number = 1
+            "#,
+        );
+
+        let stmt = Statement::from_string(self.pool.get_database_backend(), sql);
+        Ok(buffer_operation::Entity::find()
+            .from_raw_sql(stmt)
+            .all(&*tx)
+            .await?)
+    }
 }
 
 fn operation_to_storage(

crates/collab/src/db/queries/channels.rs 🔗

@@ -1,8 +1,7 @@
+use super::*;
 use rpc::proto::ChannelEdge;
 use smallvec::SmallVec;
 
-use super::*;
-
 type ChannelDescendants = HashMap<ChannelId, SmallSet<ChannelId>>;
 
 impl Database {
@@ -391,7 +390,8 @@ impl Database {
                 .all(&*tx)
                 .await?;
 
-            self.get_user_channels(channel_memberships, &tx).await
+            self.get_user_channels(user_id, channel_memberships, &tx)
+                .await
         })
         .await
     }
@@ -414,13 +414,15 @@ impl Database {
                 .all(&*tx)
                 .await?;
 
-            self.get_user_channels(channel_membership, &tx).await
+            self.get_user_channels(user_id, channel_membership, &tx)
+                .await
         })
         .await
     }
 
     pub async fn get_user_channels(
         &self,
+        user_id: UserId,
         channel_memberships: Vec<channel_member::Model>,
         tx: &DatabaseTransaction,
     ) -> Result<ChannelsForUser> {
@@ -460,10 +462,21 @@ impl Database {
             }
         }
 
+        let channel_ids = graph.channels.iter().map(|c| c.id).collect::<Vec<_>>();
+        let channel_buffer_changes = self
+            .unseen_channel_buffer_changes(user_id, &channel_ids, &*tx)
+            .await?;
+
+        let unseen_messages = self
+            .unseen_channel_messages(user_id, &channel_ids, &*tx)
+            .await?;
+
         Ok(ChannelsForUser {
             channels: graph,
             channel_participants,
             channels_with_admin_privileges,
+            unseen_buffer_changes: channel_buffer_changes,
+            channel_messages: unseen_messages,
         })
     }
 
@@ -645,7 +658,7 @@ impl Database {
     ) -> Result<Vec<ChannelId>> {
         let paths = channel_path::Entity::find()
             .filter(channel_path::Column::ChannelId.eq(channel_id))
-            .order_by(channel_path::Column::IdPath, sea_query::Order::Desc)
+            .order_by(channel_path::Column::IdPath, sea_orm::Order::Desc)
             .all(tx)
             .await?;
         let mut channel_ids = Vec::new();

crates/collab/src/db/queries/contacts.rs 🔗

@@ -18,12 +18,12 @@ impl Database {
             let user_b_participant = Alias::new("user_b_participant");
             let mut db_contacts = contact::Entity::find()
                 .column_as(
-                    Expr::tbl(user_a_participant.clone(), room_participant::Column::Id)
+                    Expr::col((user_a_participant.clone(), room_participant::Column::Id))
                         .is_not_null(),
                     "user_a_busy",
                 )
                 .column_as(
-                    Expr::tbl(user_b_participant.clone(), room_participant::Column::Id)
+                    Expr::col((user_b_participant.clone(), room_participant::Column::Id))
                         .is_not_null(),
                     "user_b_busy",
                 )

crates/collab/src/db/queries/messages.rs 🔗

@@ -93,9 +93,13 @@ impl Database {
                 .stream(&*tx)
                 .await?;
 
+            let mut max_id = None;
             let mut messages = Vec::new();
             while let Some(row) = rows.next().await {
                 let row = row?;
+
+                max_assign(&mut max_id, row.id);
+
                 let nonce = row.nonce.as_u64_pair();
                 messages.push(proto::ChannelMessage {
                     id: row.id.to_proto(),
@@ -108,6 +112,50 @@ impl Database {
                     }),
                 });
             }
+            drop(rows);
+
+            if let Some(max_id) = max_id {
+                let has_older_message = observed_channel_messages::Entity::find()
+                    .filter(
+                        observed_channel_messages::Column::UserId
+                            .eq(user_id)
+                            .and(observed_channel_messages::Column::ChannelId.eq(channel_id))
+                            .and(observed_channel_messages::Column::ChannelMessageId.lt(max_id)),
+                    )
+                    .one(&*tx)
+                    .await?
+                    .is_some();
+
+                if has_older_message {
+                    observed_channel_messages::Entity::update(
+                        observed_channel_messages::ActiveModel {
+                            user_id: ActiveValue::Unchanged(user_id),
+                            channel_id: ActiveValue::Unchanged(channel_id),
+                            channel_message_id: ActiveValue::Set(max_id),
+                        },
+                    )
+                    .exec(&*tx)
+                    .await?;
+                } else {
+                    observed_channel_messages::Entity::insert(
+                        observed_channel_messages::ActiveModel {
+                            user_id: ActiveValue::Set(user_id),
+                            channel_id: ActiveValue::Set(channel_id),
+                            channel_message_id: ActiveValue::Set(max_id),
+                        },
+                    )
+                    .on_conflict(
+                        OnConflict::columns([
+                            observed_channel_messages::Column::UserId,
+                            observed_channel_messages::Column::ChannelId,
+                        ])
+                        .update_columns([observed_channel_messages::Column::ChannelMessageId])
+                        .to_owned(),
+                    )
+                    .exec(&*tx)
+                    .await?;
+                }
+            }
 
             Ok(messages)
         })
@@ -121,7 +169,7 @@ impl Database {
         body: &str,
         timestamp: OffsetDateTime,
         nonce: u128,
-    ) -> Result<(MessageId, Vec<ConnectionId>)> {
+    ) -> Result<(MessageId, Vec<ConnectionId>, Vec<UserId>)> {
         self.transaction(|tx| async move {
             let mut rows = channel_chat_participant::Entity::find()
                 .filter(channel_chat_participant::Column::ChannelId.eq(channel_id))
@@ -130,11 +178,13 @@ impl Database {
 
             let mut is_participant = false;
             let mut participant_connection_ids = Vec::new();
+            let mut participant_user_ids = Vec::new();
             while let Some(row) = rows.next().await {
                 let row = row?;
                 if row.user_id == user_id {
                     is_participant = true;
                 }
+                participant_user_ids.push(row.user_id);
                 participant_connection_ids.push(row.connection());
             }
             drop(rows);
@@ -167,11 +217,141 @@ impl Database {
                 ConnectionId,
             }
 
-            Ok((message.last_insert_id, participant_connection_ids))
+            // Observe this message for the sender
+            self.observe_channel_message_internal(
+                channel_id,
+                user_id,
+                message.last_insert_id,
+                &*tx,
+            )
+            .await?;
+
+            let mut channel_members = self.get_channel_members_internal(channel_id, &*tx).await?;
+            channel_members.retain(|member| !participant_user_ids.contains(member));
+
+            Ok((
+                message.last_insert_id,
+                participant_connection_ids,
+                channel_members,
+            ))
+        })
+        .await
+    }
+
+    pub async fn observe_channel_message(
+        &self,
+        channel_id: ChannelId,
+        user_id: UserId,
+        message_id: MessageId,
+    ) -> Result<()> {
+        self.transaction(|tx| async move {
+            self.observe_channel_message_internal(channel_id, user_id, message_id, &*tx)
+                .await?;
+            Ok(())
         })
         .await
     }
 
+    async fn observe_channel_message_internal(
+        &self,
+        channel_id: ChannelId,
+        user_id: UserId,
+        message_id: MessageId,
+        tx: &DatabaseTransaction,
+    ) -> Result<()> {
+        observed_channel_messages::Entity::insert(observed_channel_messages::ActiveModel {
+            user_id: ActiveValue::Set(user_id),
+            channel_id: ActiveValue::Set(channel_id),
+            channel_message_id: ActiveValue::Set(message_id),
+        })
+        .on_conflict(
+            OnConflict::columns([
+                observed_channel_messages::Column::ChannelId,
+                observed_channel_messages::Column::UserId,
+            ])
+            .update_column(observed_channel_messages::Column::ChannelMessageId)
+            .action_cond_where(observed_channel_messages::Column::ChannelMessageId.lt(message_id))
+            .to_owned(),
+        )
+        // TODO: Try to upgrade SeaORM so we don't have to do this hack around their bug
+        .exec_without_returning(&*tx)
+        .await?;
+        Ok(())
+    }
+
+    pub async fn unseen_channel_messages(
+        &self,
+        user_id: UserId,
+        channel_ids: &[ChannelId],
+        tx: &DatabaseTransaction,
+    ) -> Result<Vec<proto::UnseenChannelMessage>> {
+        let mut observed_messages_by_channel_id = HashMap::default();
+        let mut rows = observed_channel_messages::Entity::find()
+            .filter(observed_channel_messages::Column::UserId.eq(user_id))
+            .filter(observed_channel_messages::Column::ChannelId.is_in(channel_ids.iter().copied()))
+            .stream(&*tx)
+            .await?;
+
+        while let Some(row) = rows.next().await {
+            let row = row?;
+            observed_messages_by_channel_id.insert(row.channel_id, row);
+        }
+        drop(rows);
+        let mut values = String::new();
+        for id in channel_ids {
+            if !values.is_empty() {
+                values.push_str(", ");
+            }
+            write!(&mut values, "({})", id).unwrap();
+        }
+
+        if values.is_empty() {
+            return Ok(Default::default());
+        }
+
+        let sql = format!(
+            r#"
+            SELECT
+                *
+            FROM (
+                SELECT
+                    *,
+                    row_number() OVER (
+                        PARTITION BY channel_id
+                        ORDER BY id DESC
+                    ) as row_number
+                FROM channel_messages
+                WHERE
+                    channel_id in ({values})
+            ) AS messages
+            WHERE
+                row_number = 1
+            "#,
+        );
+
+        let stmt = Statement::from_string(self.pool.get_database_backend(), sql);
+        let last_messages = channel_message::Model::find_by_statement(stmt)
+            .all(&*tx)
+            .await?;
+
+        let mut changes = Vec::new();
+        for last_message in last_messages {
+            if let Some(observed_message) =
+                observed_messages_by_channel_id.get(&last_message.channel_id)
+            {
+                if observed_message.channel_message_id == last_message.id {
+                    continue;
+                }
+            }
+            changes.push(proto::UnseenChannelMessage {
+                channel_id: last_message.channel_id.to_proto(),
+                message_id: last_message.id.to_proto(),
+            });
+        }
+
+        Ok(changes)
+    }
+
     pub async fn remove_channel_message(
         &self,
         channel_id: ChannelId,

crates/collab/src/db/queries/users.rs 🔗

@@ -184,7 +184,7 @@ impl Database {
             Ok(user::Entity::find()
                 .from_raw_sql(Statement::from_sql_and_values(
                     self.pool.get_database_backend(),
-                    query.into(),
+                    query,
                     vec![like_string.into(), name_query.into(), limit.into()],
                 ))
                 .all(&*tx)

crates/collab/src/db/tables.rs 🔗

@@ -12,6 +12,8 @@ pub mod contact;
 pub mod feature_flag;
 pub mod follower;
 pub mod language_server;
+pub mod observed_buffer_edits;
+pub mod observed_channel_messages;
 pub mod project;
 pub mod project_collaborator;
 pub mod room;

crates/collab/src/db/tables/observed_buffer_edits.rs 🔗

@@ -0,0 +1,43 @@
+use crate::db::{BufferId, UserId};
+use sea_orm::entity::prelude::*;
+
+#[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+#[sea_orm(table_name = "observed_buffer_edits")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub user_id: UserId,
+    pub buffer_id: BufferId,
+    pub epoch: i32,
+    pub lamport_timestamp: i32,
+    pub replica_id: i32,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::buffer::Entity",
+        from = "Column::BufferId",
+        to = "super::buffer::Column::Id"
+    )]
+    Buffer,
+    #[sea_orm(
+        belongs_to = "super::user::Entity",
+        from = "Column::UserId",
+        to = "super::user::Column::Id"
+    )]
+    User,
+}
+
+impl Related<super::buffer::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Buffer.def()
+    }
+}
+
+impl Related<super::user::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::User.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}

crates/collab/src/db/tables/observed_channel_messages.rs 🔗

@@ -0,0 +1,41 @@
+use crate::db::{ChannelId, MessageId, UserId};
+use sea_orm::entity::prelude::*;
+
+#[derive(Clone, Debug, PartialEq, Eq, DeriveEntityModel)]
+#[sea_orm(table_name = "observed_channel_messages")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub user_id: UserId,
+    pub channel_id: ChannelId,
+    pub channel_message_id: MessageId,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {
+    #[sea_orm(
+        belongs_to = "super::channel::Entity",
+        from = "Column::ChannelId",
+        to = "super::channel::Column::Id"
+    )]
+    Channel,
+    #[sea_orm(
+        belongs_to = "super::user::Entity",
+        from = "Column::UserId",
+        to = "super::user::Column::Id"
+    )]
+    User,
+}
+
+impl Related<super::channel::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::Channel.def()
+    }
+}
+
+impl Related<super::user::Entity> for Entity {
+    fn to() -> RelationDef {
+        Relation::User.def()
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}

crates/collab/src/db/tests.rs 🔗

@@ -39,7 +39,7 @@ impl TestDb {
             db.pool
                 .execute(sea_orm::Statement::from_string(
                     db.pool.get_database_backend(),
-                    sql.into(),
+                    sql,
                 ))
                 .await
                 .unwrap();
@@ -134,7 +134,7 @@ impl Drop for TestDb {
                 db.pool
                     .execute(sea_orm::Statement::from_string(
                         db.pool.get_database_backend(),
-                        query.into(),
+                        query,
                     ))
                     .await
                     .log_err();

crates/collab/src/db/tests/buffer_tests.rs 🔗

@@ -1,6 +1,6 @@
 use super::*;
 use crate::test_both_dbs;
-use language::proto;
+use language::proto::{self, serialize_version};
 use text::Buffer;
 
 test_both_dbs!(
@@ -163,3 +163,349 @@ async fn test_channel_buffers(db: &Arc<Database>) {
     assert_eq!(buffer_response_b.base_text, "hello, cruel world");
     assert_eq!(buffer_response_b.operations, &[]);
 }
+
+test_both_dbs!(
+    test_channel_buffers_last_operations,
+    test_channel_buffers_last_operations_postgres,
+    test_channel_buffers_last_operations_sqlite
+);
+
+async fn test_channel_buffers_last_operations(db: &Database) {
+    let user_id = db
+        .create_user(
+            "user_a@example.com",
+            false,
+            NewUserParams {
+                github_login: "user_a".into(),
+                github_user_id: 101,
+                invite_count: 0,
+            },
+        )
+        .await
+        .unwrap()
+        .user_id;
+    let observer_id = db
+        .create_user(
+            "user_b@example.com",
+            false,
+            NewUserParams {
+                github_login: "user_b".into(),
+                github_user_id: 102,
+                invite_count: 0,
+            },
+        )
+        .await
+        .unwrap()
+        .user_id;
+    let owner_id = db.create_server("production").await.unwrap().0 as u32;
+    let connection_id = ConnectionId {
+        owner_id,
+        id: user_id.0 as u32,
+    };
+
+    let mut buffers = Vec::new();
+    let mut text_buffers = Vec::new();
+    for i in 0..3 {
+        let channel = db
+            .create_root_channel(&format!("channel-{i}"), &format!("room-{i}"), user_id)
+            .await
+            .unwrap();
+
+        db.invite_channel_member(channel, observer_id, user_id, false)
+            .await
+            .unwrap();
+        db.respond_to_channel_invite(channel, observer_id, true)
+            .await
+            .unwrap();
+
+        db.join_channel_buffer(channel, user_id, connection_id)
+            .await
+            .unwrap();
+
+        buffers.push(
+            db.transaction(|tx| async move { db.get_channel_buffer(channel, &*tx).await })
+                .await
+                .unwrap(),
+        );
+
+        text_buffers.push(Buffer::new(0, 0, "".to_string()));
+    }
+
+    let operations = db
+        .transaction(|tx| {
+            let buffers = &buffers;
+            async move {
+                db.get_latest_operations_for_buffers([buffers[0].id, buffers[2].id], &*tx)
+                    .await
+            }
+        })
+        .await
+        .unwrap();
+
+    assert!(operations.is_empty());
+
+    update_buffer(
+        buffers[0].channel_id,
+        user_id,
+        db,
+        vec![
+            text_buffers[0].edit([(0..0, "a")]),
+            text_buffers[0].edit([(0..0, "b")]),
+            text_buffers[0].edit([(0..0, "c")]),
+        ],
+    )
+    .await;
+
+    update_buffer(
+        buffers[1].channel_id,
+        user_id,
+        db,
+        vec![
+            text_buffers[1].edit([(0..0, "d")]),
+            text_buffers[1].edit([(1..1, "e")]),
+            text_buffers[1].edit([(2..2, "f")]),
+        ],
+    )
+    .await;
+
+    // cause buffer 1's epoch to increment.
+    db.leave_channel_buffer(buffers[1].channel_id, connection_id)
+        .await
+        .unwrap();
+    db.join_channel_buffer(buffers[1].channel_id, user_id, connection_id)
+        .await
+        .unwrap();
+    text_buffers[1] = Buffer::new(1, 0, "def".to_string());
+    update_buffer(
+        buffers[1].channel_id,
+        user_id,
+        db,
+        vec![
+            text_buffers[1].edit([(0..0, "g")]),
+            text_buffers[1].edit([(0..0, "h")]),
+        ],
+    )
+    .await;
+
+    update_buffer(
+        buffers[2].channel_id,
+        user_id,
+        db,
+        vec![text_buffers[2].edit([(0..0, "i")])],
+    )
+    .await;
+
+    let operations = db
+        .transaction(|tx| {
+            let buffers = &buffers;
+            async move {
+                db.get_latest_operations_for_buffers([buffers[1].id, buffers[2].id], &*tx)
+                    .await
+            }
+        })
+        .await
+        .unwrap();
+    assert_operations(
+        &operations,
+        &[
+            (buffers[1].id, 1, &text_buffers[1]),
+            (buffers[2].id, 0, &text_buffers[2]),
+        ],
+    );
+
+    let operations = db
+        .transaction(|tx| {
+            let buffers = &buffers;
+            async move {
+                db.get_latest_operations_for_buffers([buffers[0].id, buffers[1].id], &*tx)
+                    .await
+            }
+        })
+        .await
+        .unwrap();
+    assert_operations(
+        &operations,
+        &[
+            (buffers[0].id, 0, &text_buffers[0]),
+            (buffers[1].id, 1, &text_buffers[1]),
+        ],
+    );
+
+    let buffer_changes = db
+        .transaction(|tx| {
+            let buffers = &buffers;
+            async move {
+                db.unseen_channel_buffer_changes(
+                    observer_id,
+                    &[
+                        buffers[0].channel_id,
+                        buffers[1].channel_id,
+                        buffers[2].channel_id,
+                    ],
+                    &*tx,
+                )
+                .await
+            }
+        })
+        .await
+        .unwrap();
+
+    pretty_assertions::assert_eq!(
+        buffer_changes,
+        [
+            rpc::proto::UnseenChannelBufferChange {
+                channel_id: buffers[0].channel_id.to_proto(),
+                epoch: 0,
+                version: serialize_version(&text_buffers[0].version()),
+            },
+            rpc::proto::UnseenChannelBufferChange {
+                channel_id: buffers[1].channel_id.to_proto(),
+                epoch: 1,
+                version: serialize_version(&text_buffers[1].version())
+                    .into_iter()
+                    .filter(|vector| vector.replica_id
+                        == buffer_changes[1].version.first().unwrap().replica_id)
+                    .collect::<Vec<_>>(),
+            },
+            rpc::proto::UnseenChannelBufferChange {
+                channel_id: buffers[2].channel_id.to_proto(),
+                epoch: 0,
+                version: serialize_version(&text_buffers[2].version()),
+            },
+        ]
+    );
+
+    db.observe_buffer_version(
+        buffers[1].id,
+        observer_id,
+        1,
+        serialize_version(&text_buffers[1].version()).as_slice(),
+    )
+    .await
+    .unwrap();
+
+    let buffer_changes = db
+        .transaction(|tx| {
+            let buffers = &buffers;
+            async move {
+                db.unseen_channel_buffer_changes(
+                    observer_id,
+                    &[
+                        buffers[0].channel_id,
+                        buffers[1].channel_id,
+                        buffers[2].channel_id,
+                    ],
+                    &*tx,
+                )
+                .await
+            }
+        })
+        .await
+        .unwrap();
+
+    assert_eq!(
+        buffer_changes,
+        [
+            rpc::proto::UnseenChannelBufferChange {
+                channel_id: buffers[0].channel_id.to_proto(),
+                epoch: 0,
+                version: serialize_version(&text_buffers[0].version()),
+            },
+            rpc::proto::UnseenChannelBufferChange {
+                channel_id: buffers[2].channel_id.to_proto(),
+                epoch: 0,
+                version: serialize_version(&text_buffers[2].version()),
+            },
+        ]
+    );
+
+    // Observe an earlier version of the buffer.
+    db.observe_buffer_version(
+        buffers[1].id,
+        observer_id,
+        1,
+        &[rpc::proto::VectorClockEntry {
+            replica_id: 0,
+            timestamp: 0,
+        }],
+    )
+    .await
+    .unwrap();
+
+    let buffer_changes = db
+        .transaction(|tx| {
+            let buffers = &buffers;
+            async move {
+                db.unseen_channel_buffer_changes(
+                    observer_id,
+                    &[
+                        buffers[0].channel_id,
+                        buffers[1].channel_id,
+                        buffers[2].channel_id,
+                    ],
+                    &*tx,
+                )
+                .await
+            }
+        })
+        .await
+        .unwrap();
+
+    assert_eq!(
+        buffer_changes,
+        [
+            rpc::proto::UnseenChannelBufferChange {
+                channel_id: buffers[0].channel_id.to_proto(),
+                epoch: 0,
+                version: serialize_version(&text_buffers[0].version()),
+            },
+            rpc::proto::UnseenChannelBufferChange {
+                channel_id: buffers[2].channel_id.to_proto(),
+                epoch: 0,
+                version: serialize_version(&text_buffers[2].version()),
+            },
+        ]
+    );
+}
+
+async fn update_buffer(
+    channel_id: ChannelId,
+    user_id: UserId,
+    db: &Database,
+    operations: Vec<text::Operation>,
+) {
+    let operations = operations
+        .into_iter()
+        .map(|op| proto::serialize_operation(&language::Operation::Buffer(op)))
+        .collect::<Vec<_>>();
+    db.update_channel_buffer(channel_id, user_id, &operations)
+        .await
+        .unwrap();
+}
+
+fn assert_operations(
+    operations: &[buffer_operation::Model],
+    expected: &[(BufferId, i32, &text::Buffer)],
+) {
+    let actual = operations
+        .iter()
+        .map(|op| buffer_operation::Model {
+            buffer_id: op.buffer_id,
+            epoch: op.epoch,
+            lamport_timestamp: op.lamport_timestamp,
+            replica_id: op.replica_id,
+            value: vec![],
+        })
+        .collect::<Vec<_>>();
+    let expected = expected
+        .iter()
+        .map(|(buffer_id, epoch, buffer)| buffer_operation::Model {
+            buffer_id: *buffer_id,
+            epoch: *epoch,
+            lamport_timestamp: buffer.lamport_clock.value as i32 - 1,
+            replica_id: buffer.replica_id() as i32,
+            value: vec![],
+        })
+        .collect::<Vec<_>>();
+    assert_eq!(actual, expected, "unexpected operations")
+}

crates/collab/src/db/tests/message_tests.rs 🔗

@@ -57,3 +57,188 @@ async fn test_channel_message_nonces(db: &Arc<Database>) {
     assert_eq!(msg1_id, msg3_id);
     assert_eq!(msg2_id, msg4_id);
 }
+
+test_both_dbs!(
+    test_channel_message_new_notification,
+    test_channel_message_new_notification_postgres,
+    test_channel_message_new_notification_sqlite
+);
+
+async fn test_channel_message_new_notification(db: &Arc<Database>) {
+    let user = db
+        .create_user(
+            "user_a@example.com",
+            false,
+            NewUserParams {
+                github_login: "user_a".into(),
+                github_user_id: 1,
+                invite_count: 0,
+            },
+        )
+        .await
+        .unwrap()
+        .user_id;
+    let observer = db
+        .create_user(
+            "user_b@example.com",
+            false,
+            NewUserParams {
+                github_login: "user_b".into(),
+                github_user_id: 1,
+                invite_count: 0,
+            },
+        )
+        .await
+        .unwrap()
+        .user_id;
+
+    let channel_1 = db
+        .create_channel("channel", None, "room", user)
+        .await
+        .unwrap();
+
+    let channel_2 = db
+        .create_channel("channel-2", None, "room", user)
+        .await
+        .unwrap();
+
+    db.invite_channel_member(channel_1, observer, user, false)
+        .await
+        .unwrap();
+
+    db.respond_to_channel_invite(channel_1, observer, true)
+        .await
+        .unwrap();
+
+    db.invite_channel_member(channel_2, observer, user, false)
+        .await
+        .unwrap();
+
+    db.respond_to_channel_invite(channel_2, observer, true)
+        .await
+        .unwrap();
+
+    let owner_id = db.create_server("test").await.unwrap().0 as u32;
+    let user_connection_id = rpc::ConnectionId { owner_id, id: 0 };
+
+    db.join_channel_chat(channel_1, user_connection_id, user)
+        .await
+        .unwrap();
+
+    let _ = db
+        .create_channel_message(channel_1, user, "1_1", OffsetDateTime::now_utc(), 1)
+        .await
+        .unwrap();
+
+    let (second_message, _, _) = db
+        .create_channel_message(channel_1, user, "1_2", OffsetDateTime::now_utc(), 2)
+        .await
+        .unwrap();
+
+    let (third_message, _, _) = db
+        .create_channel_message(channel_1, user, "1_3", OffsetDateTime::now_utc(), 3)
+        .await
+        .unwrap();
+
+    db.join_channel_chat(channel_2, user_connection_id, user)
+        .await
+        .unwrap();
+
+    let (fourth_message, _, _) = db
+        .create_channel_message(channel_2, user, "2_1", OffsetDateTime::now_utc(), 4)
+        .await
+        .unwrap();
+
+    // Check that observer has new messages
+    let unseen_messages = db
+        .transaction(|tx| async move {
+            db.unseen_channel_messages(observer, &[channel_1, channel_2], &*tx)
+                .await
+        })
+        .await
+        .unwrap();
+
+    assert_eq!(
+        unseen_messages,
+        [
+            rpc::proto::UnseenChannelMessage {
+                channel_id: channel_1.to_proto(),
+                message_id: third_message.to_proto(),
+            },
+            rpc::proto::UnseenChannelMessage {
+                channel_id: channel_2.to_proto(),
+                message_id: fourth_message.to_proto(),
+            },
+        ]
+    );
+
+    // Observe the second message
+    db.observe_channel_message(channel_1, observer, second_message)
+        .await
+        .unwrap();
+
+    // Make sure the observer still has a new message
+    let unseen_messages = db
+        .transaction(|tx| async move {
+            db.unseen_channel_messages(observer, &[channel_1, channel_2], &*tx)
+                .await
+        })
+        .await
+        .unwrap();
+    assert_eq!(
+        unseen_messages,
+        [
+            rpc::proto::UnseenChannelMessage {
+                channel_id: channel_1.to_proto(),
+                message_id: third_message.to_proto(),
+            },
+            rpc::proto::UnseenChannelMessage {
+                channel_id: channel_2.to_proto(),
+                message_id: fourth_message.to_proto(),
+            },
+        ]
+    );
+
+    // Observe the third message,
+    db.observe_channel_message(channel_1, observer, third_message)
+        .await
+        .unwrap();
+
+    // Make sure the observer does not have a new method
+    let unseen_messages = db
+        .transaction(|tx| async move {
+            db.unseen_channel_messages(observer, &[channel_1, channel_2], &*tx)
+                .await
+        })
+        .await
+        .unwrap();
+
+    assert_eq!(
+        unseen_messages,
+        [rpc::proto::UnseenChannelMessage {
+            channel_id: channel_2.to_proto(),
+            message_id: fourth_message.to_proto(),
+        }]
+    );
+
+    // Observe the second message again, should not regress our observed state
+    db.observe_channel_message(channel_1, observer, second_message)
+        .await
+        .unwrap();
+
+    // Make sure the observer does not have a new message
+    let unseen_messages = db
+        .transaction(|tx| async move {
+            db.unseen_channel_messages(observer, &[channel_1, channel_2], &*tx)
+                .await
+        })
+        .await
+        .unwrap();
+    assert_eq!(
+        unseen_messages,
+        [rpc::proto::UnseenChannelMessage {
+            channel_id: channel_2.to_proto(),
+            message_id: fourth_message.to_proto(),
+        }]
+    );
+}

crates/collab/src/rpc.rs 🔗

@@ -3,8 +3,8 @@ mod connection_pool;
 use crate::{
     auth,
     db::{
-        self, ChannelId, ChannelsForUser, Database, MessageId, ProjectId, RoomId, ServerId, User,
-        UserId,
+        self, BufferId, ChannelId, ChannelsForUser, Database, MessageId, ProjectId, RoomId,
+        ServerId, User, UserId,
     },
     executor::Executor,
     AppState, Result,
@@ -274,7 +274,9 @@ impl Server {
             .add_message_handler(unfollow)
             .add_message_handler(update_followers)
             .add_message_handler(update_diff_base)
-            .add_request_handler(get_private_user_info);
+            .add_request_handler(get_private_user_info)
+            .add_message_handler(acknowledge_channel_message)
+            .add_message_handler(acknowledge_buffer_version);
 
         Arc::new(server)
     }
@@ -2568,6 +2570,8 @@ async fn respond_to_channel_invite(
                         name: channel.name,
                     }),
             );
+        update.unseen_channel_messages = result.channel_messages;
+        update.unseen_channel_buffer_changes = result.unseen_buffer_changes;
         update.insert_edge = result.channels.edges;
         update
             .channel_participants
@@ -2691,7 +2695,7 @@ async fn update_channel_buffer(
     let db = session.db().await;
     let channel_id = ChannelId::from_proto(request.channel_id);
 
-    let collaborators = db
+    let (collaborators, non_collaborators, epoch, version) = db
         .update_channel_buffer(channel_id, session.user_id, &request.operations)
         .await?;
 
@@ -2704,6 +2708,29 @@ async fn update_channel_buffer(
         },
         &session.peer,
     );
+
+    let pool = &*session.connection_pool().await;
+
+    broadcast(
+        None,
+        non_collaborators
+            .iter()
+            .flat_map(|user_id| pool.user_connection_ids(*user_id)),
+        |peer_id| {
+            session.peer.send(
+                peer_id.into(),
+                proto::UpdateChannels {
+                    unseen_channel_buffer_changes: vec![proto::UnseenChannelBufferChange {
+                        channel_id: channel_id.to_proto(),
+                        epoch: epoch as u64,
+                        version: version.clone(),
+                    }],
+                    ..Default::default()
+                },
+            )
+        },
+    );
+
     Ok(())
 }
 
@@ -2799,7 +2826,7 @@ async fn send_channel_message(
         .ok_or_else(|| anyhow!("nonce can't be blank"))?;
 
     let channel_id = ChannelId::from_proto(request.channel_id);
-    let (message_id, connection_ids) = session
+    let (message_id, connection_ids, non_participants) = session
         .db()
         .await
         .create_channel_message(
@@ -2829,6 +2856,27 @@ async fn send_channel_message(
     response.send(proto::SendChannelMessageResponse {
         message: Some(message),
     })?;
+
+    let pool = &*session.connection_pool().await;
+    broadcast(
+        None,
+        non_participants
+            .iter()
+            .flat_map(|user_id| pool.user_connection_ids(*user_id)),
+        |peer_id| {
+            session.peer.send(
+                peer_id.into(),
+                proto::UpdateChannels {
+                    unseen_channel_messages: vec![proto::UnseenChannelMessage {
+                        channel_id: channel_id.to_proto(),
+                        message_id: message_id.to_proto(),
+                    }],
+                    ..Default::default()
+                },
+            )
+        },
+    );
+
     Ok(())
 }
 
@@ -2851,6 +2899,38 @@ async fn remove_channel_message(
     Ok(())
 }
 
+async fn acknowledge_channel_message(
+    request: proto::AckChannelMessage,
+    session: Session,
+) -> Result<()> {
+    let channel_id = ChannelId::from_proto(request.channel_id);
+    let message_id = MessageId::from_proto(request.message_id);
+    session
+        .db()
+        .await
+        .observe_channel_message(channel_id, session.user_id, message_id)
+        .await?;
+    Ok(())
+}
+
+async fn acknowledge_buffer_version(
+    request: proto::AckBufferOperation,
+    session: Session,
+) -> Result<()> {
+    let buffer_id = BufferId::from_proto(request.buffer_id);
+    session
+        .db()
+        .await
+        .observe_buffer_version(
+            buffer_id,
+            session.user_id,
+            request.epoch as i32,
+            &request.version,
+        )
+        .await?;
+    Ok(())
+}
+
 async fn join_channel_chat(
     request: proto::JoinChannelChat,
     response: Response<proto::JoinChannelChat>,
@@ -2986,6 +3066,8 @@ fn build_initial_channels_update(
         });
     }
 
+    update.unseen_channel_buffer_changes = channels.unseen_buffer_changes;
+    update.unseen_channel_messages = channels.channel_messages;
     update.insert_edge = channels.channels.edges;
 
     for (channel_id, participants) in channels.channel_participants {

crates/collab/src/tests/channel_buffer_tests.rs 🔗

@@ -3,7 +3,7 @@ use crate::{
     tests::TestServer,
 };
 use call::ActiveCall;
-use channel::Channel;
+use channel::{Channel, ACKNOWLEDGE_DEBOUNCE_INTERVAL};
 use client::ParticipantIndex;
 use client::{Collaborator, UserId};
 use collab_ui::channel_view::ChannelView;
@@ -410,10 +410,7 @@ async fn test_channel_buffer_disconnect(
     channel_buffer_a.update(cx_a, |buffer, _| {
         assert_eq!(
             buffer.channel().as_ref(),
-            &Channel {
-                id: channel_id,
-                name: "the-channel".to_string()
-            }
+            &channel(channel_id, "the-channel")
         );
         assert!(!buffer.is_connected());
     });
@@ -438,15 +435,21 @@ async fn test_channel_buffer_disconnect(
     channel_buffer_b.update(cx_b, |buffer, _| {
         assert_eq!(
             buffer.channel().as_ref(),
-            &Channel {
-                id: channel_id,
-                name: "the-channel".to_string()
-            }
+            &channel(channel_id, "the-channel")
         );
         assert!(!buffer.is_connected());
     });
 }
 
+fn channel(id: u64, name: &'static str) -> Channel {
+    Channel {
+        id,
+        name: name.to_string(),
+        unseen_note_version: None,
+        unseen_message_id: None,
+    }
+}
+
 #[gpui::test]
 async fn test_rejoin_channel_buffer(
     deterministic: Arc<Deterministic>,
@@ -627,6 +630,7 @@ async fn test_following_to_channel_notes_without_a_shared_project(
     let mut server = TestServer::start(&deterministic).await;
     let client_a = server.create_client(cx_a, "user_a").await;
     let client_b = server.create_client(cx_b, "user_b").await;
+
     let client_c = server.create_client(cx_c, "user_c").await;
 
     cx_a.update(editor::init);
@@ -755,6 +759,126 @@ async fn test_following_to_channel_notes_without_a_shared_project(
     });
 }
 
+#[gpui::test]
+async fn test_channel_buffer_changes(
+    deterministic: Arc<Deterministic>,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+) {
+    deterministic.forbid_parking();
+    let mut server = TestServer::start(&deterministic).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+
+    let channel_id = server
+        .make_channel(
+            "the-channel",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b)],
+        )
+        .await;
+
+    let channel_buffer_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_buffer(channel_id, cx))
+        .await
+        .unwrap();
+
+    // Client A makes an edit, and client B should see that the note has changed.
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "1")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(has_buffer_changed);
+
+    // Opening the buffer should clear the changed flag.
+    let project_b = client_b.build_empty_local_project(cx_b);
+    let workspace_b = client_b.build_workspace(&project_b, cx_b).root(cx_b);
+    let channel_view_b = cx_b
+        .update(|cx| ChannelView::open(channel_id, workspace_b.clone(), cx))
+        .await
+        .unwrap();
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(!has_buffer_changed);
+
+    // Editing the channel while the buffer is open should not show that the buffer has changed.
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "2")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(!has_buffer_changed);
+
+    deterministic.advance_clock(ACKNOWLEDGE_DEBOUNCE_INTERVAL);
+
+    // Test that the server is tracking things correctly, and we retain our 'not changed'
+    // state across a disconnect
+    server.simulate_long_connection_interruption(client_b.peer_id().unwrap(), &deterministic);
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(!has_buffer_changed);
+
+    // Closing the buffer should re-enable change tracking
+    cx_b.update(|cx| {
+        workspace_b.update(cx, |workspace, cx| {
+            workspace.close_all_items_and_panes(&Default::default(), cx)
+        });
+
+        drop(channel_view_b)
+    });
+
+    deterministic.run_until_parked();
+
+    channel_buffer_a.update(cx_a, |buffer, cx| {
+        buffer.buffer().update(cx, |buffer, cx| {
+            buffer.edit([(0..0, "3")], None, cx);
+        })
+    });
+    deterministic.run_until_parked();
+
+    let has_buffer_changed = cx_b.read(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_channel_buffer_changed(channel_id)
+            .unwrap()
+    });
+    assert!(has_buffer_changed);
+}
+
 #[track_caller]
 fn assert_collaborators(collaborators: &HashMap<PeerId, Collaborator>, ids: &[Option<UserId>]) {
     let mut user_ids = collaborators

crates/collab/src/tests/channel_message_tests.rs 🔗

@@ -1,7 +1,9 @@
 use crate::{rpc::RECONNECT_TIMEOUT, tests::TestServer};
 use channel::{ChannelChat, ChannelMessageId};
-use gpui::{executor::Deterministic, ModelHandle, TestAppContext};
+use collab_ui::chat_panel::ChatPanel;
+use gpui::{executor::Deterministic, BorrowAppContext, ModelHandle, TestAppContext};
 use std::sync::Arc;
+use workspace::dock::Panel;
 
 #[gpui::test]
 async fn test_basic_channel_messages(
@@ -223,3 +225,136 @@ fn assert_messages(chat: &ModelHandle<ChannelChat>, messages: &[&str], cx: &mut
         messages
     );
 }
+
+#[gpui::test]
+async fn test_channel_message_changes(
+    deterministic: Arc<Deterministic>,
+    cx_a: &mut TestAppContext,
+    cx_b: &mut TestAppContext,
+) {
+    deterministic.forbid_parking();
+    let mut server = TestServer::start(&deterministic).await;
+    let client_a = server.create_client(cx_a, "user_a").await;
+    let client_b = server.create_client(cx_b, "user_b").await;
+
+    let channel_id = server
+        .make_channel(
+            "the-channel",
+            None,
+            (&client_a, cx_a),
+            &mut [(&client_b, cx_b)],
+        )
+        .await;
+
+    // Client A sends a message, client B should see that there is a new message.
+    let channel_chat_a = client_a
+        .channel_store()
+        .update(cx_a, |store, cx| store.open_channel_chat(channel_id, cx))
+        .await
+        .unwrap();
+
+    channel_chat_a
+        .update(cx_a, |c, cx| c.send_message("one".into(), cx).unwrap())
+        .await
+        .unwrap();
+
+    deterministic.run_until_parked();
+
+    let b_has_messages = cx_b.read_with(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_new_messages(channel_id)
+            .unwrap()
+    });
+
+    assert!(b_has_messages);
+
+    // Opening the chat should clear the changed flag.
+    cx_b.update(|cx| {
+        collab_ui::init(&client_b.app_state, cx);
+    });
+    let project_b = client_b.build_empty_local_project(cx_b);
+    let workspace_b = client_b.build_workspace(&project_b, cx_b).root(cx_b);
+    let chat_panel_b = workspace_b.update(cx_b, |workspace, cx| ChatPanel::new(workspace, cx));
+    chat_panel_b
+        .update(cx_b, |chat_panel, cx| {
+            chat_panel.set_active(true, cx);
+            chat_panel.select_channel(channel_id, cx)
+        })
+        .await
+        .unwrap();
+
+    deterministic.run_until_parked();
+
+    let b_has_messages = cx_b.read_with(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_new_messages(channel_id)
+            .unwrap()
+    });
+
+    assert!(!b_has_messages);
+
+    // Sending a message while the chat is open should not change the flag.
+    channel_chat_a
+        .update(cx_a, |c, cx| c.send_message("two".into(), cx).unwrap())
+        .await
+        .unwrap();
+
+    deterministic.run_until_parked();
+
+    let b_has_messages = cx_b.read_with(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_new_messages(channel_id)
+            .unwrap()
+    });
+
+    assert!(!b_has_messages);
+
+    // Sending a message while the chat is closed should change the flag.
+    chat_panel_b.update(cx_b, |chat_panel, cx| {
+        chat_panel.set_active(false, cx);
+    });
+
+    // Sending a message while the chat is open should not change the flag.
+    channel_chat_a
+        .update(cx_a, |c, cx| c.send_message("three".into(), cx).unwrap())
+        .await
+        .unwrap();
+
+    deterministic.run_until_parked();
+
+    let b_has_messages = cx_b.read_with(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_new_messages(channel_id)
+            .unwrap()
+    });
+
+    assert!(b_has_messages);
+
+    // Closing the chat should re-enable change tracking
+    cx_b.update(|_| drop(chat_panel_b));
+
+    channel_chat_a
+        .update(cx_a, |c, cx| c.send_message("four".into(), cx).unwrap())
+        .await
+        .unwrap();
+
+    deterministic.run_until_parked();
+
+    let b_has_messages = cx_b.read_with(|cx| {
+        client_b
+            .channel_store()
+            .read(cx)
+            .has_new_messages(channel_id)
+            .unwrap()
+    });
+
+    assert!(b_has_messages);
+}

crates/collab/src/tests/test_server.rs 🔗

@@ -1,7 +1,7 @@
 use crate::{
     db::{tests::TestDb, NewUserParams, UserId},
     executor::Executor,
-    rpc::{Server, CLEANUP_TIMEOUT},
+    rpc::{Server, CLEANUP_TIMEOUT, RECONNECT_TIMEOUT},
     AppState,
 };
 use anyhow::anyhow;
@@ -17,6 +17,7 @@ use gpui::{executor::Deterministic, ModelHandle, Task, TestAppContext, WindowHan
 use language::LanguageRegistry;
 use parking_lot::Mutex;
 use project::{Project, WorktreeId};
+use rpc::RECEIVE_TIMEOUT;
 use settings::SettingsStore;
 use std::{
     cell::{Ref, RefCell, RefMut},
@@ -151,12 +152,12 @@ impl TestServer {
 
         Arc::get_mut(&mut client)
             .unwrap()
-            .set_id(user_id.0 as usize)
+            .set_id(user_id.to_proto())
             .override_authenticate(move |cx| {
                 cx.spawn(|_| async move {
                     let access_token = "the-token".to_string();
                     Ok(Credentials {
-                        user_id: user_id.0 as u64,
+                        user_id: user_id.to_proto(),
                         access_token,
                     })
                 })
@@ -255,6 +256,19 @@ impl TestServer {
             .store(true, SeqCst);
     }
 
+    pub fn simulate_long_connection_interruption(
+        &self,
+        peer_id: PeerId,
+        deterministic: &Arc<Deterministic>,
+    ) {
+        self.forbid_connections();
+        self.disconnect_client(peer_id);
+        deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
+        self.allow_connections();
+        deterministic.advance_clock(RECEIVE_TIMEOUT + RECONNECT_TIMEOUT);
+        deterministic.run_until_parked();
+    }
+
     pub fn forbid_connections(&self) {
         self.forbid_connections.store(true, SeqCst);
     }

crates/collab_ui/src/channel_view.rs 🔗

@@ -1,6 +1,6 @@
 use anyhow::{anyhow, Result};
 use call::report_call_event_for_channel;
-use channel::{Channel, ChannelBuffer, ChannelBufferEvent, ChannelId};
+use channel::{Channel, ChannelBuffer, ChannelBufferEvent, ChannelId, ChannelStore};
 use client::{
     proto::{self, PeerId},
     Collaborator, ParticipantIndex,
@@ -36,6 +36,7 @@ pub fn init(cx: &mut AppContext) {
 pub struct ChannelView {
     pub editor: ViewHandle<Editor>,
     project: ModelHandle<Project>,
+    channel_store: ModelHandle<ChannelStore>,
     channel_buffer: ModelHandle<ChannelBuffer>,
     remote_id: Option<ViewId>,
     _editor_event_subscription: Subscription,
@@ -94,7 +95,13 @@ impl ChannelView {
             pane.update(&mut cx, |pane, cx| {
                 pane.items_of_type::<Self>()
                     .find(|channel_view| channel_view.read(cx).channel_buffer == channel_buffer)
-                    .unwrap_or_else(|| cx.add_view(|cx| Self::new(project, channel_buffer, cx)))
+                    .unwrap_or_else(|| {
+                        cx.add_view(|cx| {
+                            let mut this = Self::new(project, channel_store, channel_buffer, cx);
+                            this.acknowledge_buffer_version(cx);
+                            this
+                        })
+                    })
             })
             .ok_or_else(|| anyhow!("pane was dropped"))
         })
@@ -102,6 +109,7 @@ impl ChannelView {
 
     pub fn new(
         project: ModelHandle<Project>,
+        channel_store: ModelHandle<ChannelStore>,
         channel_buffer: ModelHandle<ChannelBuffer>,
         cx: &mut ViewContext<Self>,
     ) -> Self {
@@ -121,6 +129,7 @@ impl ChannelView {
         Self {
             editor,
             project,
+            channel_store,
             channel_buffer,
             remote_id: None,
             _editor_event_subscription,
@@ -137,13 +146,44 @@ impl ChannelView {
         event: &ChannelBufferEvent,
         cx: &mut ViewContext<Self>,
     ) {
-        if let ChannelBufferEvent::Disconnected = event {
-            self.editor.update(cx, |editor, cx| {
+        match event {
+            ChannelBufferEvent::Disconnected => self.editor.update(cx, |editor, cx| {
                 editor.set_read_only(true);
                 cx.notify();
-            })
+            }),
+            ChannelBufferEvent::BufferEdited => {
+                if cx.is_self_focused() || self.editor.is_focused(cx) {
+                    self.acknowledge_buffer_version(cx);
+                } else {
+                    self.channel_store.update(cx, |store, cx| {
+                        let channel_buffer = self.channel_buffer.read(cx);
+                        store.notes_changed(
+                            channel_buffer.channel().id,
+                            channel_buffer.epoch(),
+                            &channel_buffer.buffer().read(cx).version(),
+                            cx,
+                        )
+                    });
+                }
+            }
+            _ => {}
         }
     }
+
+    fn acknowledge_buffer_version(&mut self, cx: &mut ViewContext<'_, '_, ChannelView>) {
+        self.channel_store.update(cx, |store, cx| {
+            let channel_buffer = self.channel_buffer.read(cx);
+            store.acknowledge_notes_version(
+                channel_buffer.channel().id,
+                channel_buffer.epoch(),
+                &channel_buffer.buffer().read(cx).version(),
+                cx,
+            )
+        });
+        self.channel_buffer.update(cx, |buffer, cx| {
+            buffer.acknowledge_buffer_version(cx);
+        });
+    }
 }
 
 impl Entity for ChannelView {
@@ -161,6 +201,7 @@ impl View for ChannelView {
 
     fn focus_in(&mut self, _: AnyViewHandle, cx: &mut ViewContext<Self>) {
         if cx.is_self_focused() {
+            self.acknowledge_buffer_version(cx);
             cx.focus(self.editor.as_any())
         }
     }
@@ -200,6 +241,7 @@ impl Item for ChannelView {
     fn clone_on_split(&self, _: WorkspaceId, cx: &mut ViewContext<Self>) -> Option<Self> {
         Some(Self::new(
             self.project.clone(),
+            self.channel_store.clone(),
             self.channel_buffer.clone(),
             cx,
         ))

crates/collab_ui/src/chat_panel.rs 🔗

@@ -42,6 +42,7 @@ pub struct ChatPanel {
     local_timezone: UtcOffset,
     fs: Arc<dyn Fs>,
     width: Option<f32>,
+    active: bool,
     pending_serialization: Task<Option<()>>,
     subscriptions: Vec<gpui::Subscription>,
     workspace: WeakViewHandle<Workspace>,
@@ -138,6 +139,7 @@ impl ChatPanel {
                 has_focus: false,
                 subscriptions: Vec::new(),
                 workspace: workspace_handle,
+                active: false,
                 width: None,
             };
 
@@ -154,9 +156,9 @@ impl ChatPanel {
                     }),
                 );
 
-            this.init_active_channel(cx);
+            this.update_channel_count(cx);
             cx.observe(&this.channel_store, |this, _, cx| {
-                this.init_active_channel(cx);
+                this.update_channel_count(cx)
             })
             .detach();
 
@@ -179,6 +181,10 @@ impl ChatPanel {
         })
     }
 
+    pub fn active_chat(&self) -> Option<ModelHandle<ChannelChat>> {
+        self.active_chat.as_ref().map(|(chat, _)| chat.clone())
+    }
+
     pub fn load(
         workspace: WeakViewHandle<Workspace>,
         cx: AsyncAppContext,
@@ -225,10 +231,8 @@ impl ChatPanel {
         );
     }
 
-    fn init_active_channel(&mut self, cx: &mut ViewContext<Self>) {
+    fn update_channel_count(&mut self, cx: &mut ViewContext<Self>) {
         let channel_count = self.channel_store.read(cx).channel_count();
-        self.message_list.reset(0);
-        self.active_chat = None;
         self.channel_select.update(cx, |select, cx| {
             select.set_item_count(channel_count, cx);
         });
@@ -247,6 +251,7 @@ impl ChatPanel {
             }
             let subscription = cx.subscribe(&chat, Self::channel_did_change);
             self.active_chat = Some((chat, subscription));
+            self.acknowledge_last_message(cx);
             self.channel_select.update(cx, |select, cx| {
                 if let Some(ix) = self.channel_store.read(cx).index_of_channel(id) {
                     select.set_selected_index(ix, cx);
@@ -268,11 +273,34 @@ impl ChatPanel {
                 new_count,
             } => {
                 self.message_list.splice(old_range.clone(), *new_count);
+                if self.active {
+                    self.acknowledge_last_message(cx);
+                }
+            }
+            ChannelChatEvent::NewMessage {
+                channel_id,
+                message_id,
+            } => {
+                if !self.active {
+                    self.channel_store.update(cx, |store, cx| {
+                        store.new_message(*channel_id, *message_id, cx)
+                    })
+                }
             }
         }
         cx.notify();
     }
 
+    fn acknowledge_last_message(&mut self, cx: &mut ViewContext<'_, '_, ChatPanel>) {
+        if self.active {
+            if let Some((chat, _)) = &self.active_chat {
+                chat.update(cx, |chat, cx| {
+                    chat.acknowledge_last_message(cx);
+                });
+            }
+        }
+    }
+
     fn render_channel(&self, cx: &mut ViewContext<Self>) -> AnyElement<Self> {
         let theme = theme::current(cx);
         Flex::column()
@@ -627,8 +655,12 @@ impl Panel for ChatPanel {
     }
 
     fn set_active(&mut self, active: bool, cx: &mut ViewContext<Self>) {
-        if active && !is_chat_feature_enabled(cx) {
-            cx.emit(Event::Dismissed);
+        self.active = active;
+        if active {
+            self.acknowledge_last_message(cx);
+            if !is_chat_feature_enabled(cx) {
+                cx.emit(Event::Dismissed);
+            }
         }
     }
 

crates/collab_ui/src/collab_panel.rs 🔗

@@ -592,6 +592,7 @@ impl CollabPanel {
                             *channel_id,
                             &theme.collab_panel,
                             is_selected,
+                            ix,
                             cx,
                         ),
                         ListEntry::ChannelInvite(channel) => Self::render_channel_invite(
@@ -1917,7 +1918,9 @@ impl CollabPanel {
         const FACEPILE_LIMIT: usize = 3;
 
         enum ChannelCall {}
-        enum IconTooltip {}
+        enum ChannelNote {}
+        enum NotesTooltip {}
+        enum ChatTooltip {}
         enum ChannelTooltip {}
 
         let mut is_dragged_over = false;
@@ -1960,71 +1963,113 @@ impl CollabPanel {
                         .aligned()
                         .left(),
                 )
-                .with_child(
-                    Label::new(channel.name.clone(), collab_theme.channel_name.text.clone())
-                        .contained()
-                        .with_style(collab_theme.channel_name.container)
-                        .aligned()
-                        .left()
-                        .with_tooltip::<ChannelTooltip>(
-                            channel_id as usize,
-                            if is_active {
-                                "Open channel notes"
-                            } else {
-                                "Join channel"
-                            },
-                            None,
-                            theme.tooltip.clone(),
-                            cx,
-                        )
-                        .flex(1., true),
-                )
-                .with_child(
-                    MouseEventHandler::new::<ChannelCall, _>(ix, cx, move |_, cx| {
-                        let participants =
-                            self.channel_store.read(cx).channel_participants(channel_id);
-                        if !participants.is_empty() {
-                            let extra_count = participants.len().saturating_sub(FACEPILE_LIMIT);
-
-                            FacePile::new(collab_theme.face_overlap)
-                                .with_children(
-                                    participants
-                                        .iter()
-                                        .filter_map(|user| {
-                                            Some(
-                                                Image::from_data(user.avatar.clone()?)
-                                                    .with_style(collab_theme.channel_avatar),
-                                            )
-                                        })
-                                        .take(FACEPILE_LIMIT),
-                                )
-                                .with_children((extra_count > 0).then(|| {
-                                    Label::new(
-                                        format!("+{}", extra_count),
-                                        collab_theme.extra_participant_label.text.clone(),
-                                    )
-                                    .contained()
-                                    .with_style(collab_theme.extra_participant_label.container)
-                                }))
-                                .with_tooltip::<IconTooltip>(
-                                    channel_id as usize,
+                .with_child({
+                    let style = collab_theme.channel_name.inactive_state();
+                    Flex::row()
+                        .with_child(
+                            Label::new(channel.name.clone(), style.text.clone())
+                                .contained()
+                                .with_style(style.container)
+                                .aligned()
+                                .left()
+                                .with_tooltip::<ChannelTooltip>(
+                                    ix,
                                     if is_active {
-                                        "Open Channel Notes"
+                                        "Open channel notes"
                                     } else {
                                         "Join channel"
                                     },
                                     None,
                                     theme.tooltip.clone(),
                                     cx,
-                                )
+                                ),
+                        )
+                        .with_children({
+                            let participants =
+                                self.channel_store.read(cx).channel_participants(channel_id);
+
+                            if !participants.is_empty() {
+                                let extra_count = participants.len().saturating_sub(FACEPILE_LIMIT);
+
+                                let result = FacePile::new(collab_theme.face_overlap)
+                                    .with_children(
+                                        participants
+                                            .iter()
+                                            .filter_map(|user| {
+                                                Some(
+                                                    Image::from_data(user.avatar.clone()?)
+                                                        .with_style(collab_theme.channel_avatar),
+                                                )
+                                            })
+                                            .take(FACEPILE_LIMIT),
+                                    )
+                                    .with_children((extra_count > 0).then(|| {
+                                        Label::new(
+                                            format!("+{}", extra_count),
+                                            collab_theme.extra_participant_label.text.clone(),
+                                        )
+                                        .contained()
+                                        .with_style(collab_theme.extra_participant_label.container)
+                                    }));
+
+                                Some(result)
+                            } else {
+                                None
+                            }
+                        })
+                        .with_spacing(8.)
+                        .align_children_center()
+                        .flex(1., true)
+                })
+                .with_child(
+                    MouseEventHandler::new::<ChannelNote, _>(ix, cx, move |_, _| {
+                        if channel.unseen_message_id.is_some() {
+                            Svg::new("icons/conversations.svg")
+                                .with_color(collab_theme.channel_note_active_color)
+                                .constrained()
+                                .with_width(collab_theme.channel_hash.width)
                                 .into_any()
                         } else if row_hovered {
-                            Svg::new("icons/file.svg")
+                            Svg::new("icons/conversations.svg")
                                 .with_color(collab_theme.channel_hash.color)
                                 .constrained()
                                 .with_width(collab_theme.channel_hash.width)
-                                .with_tooltip::<IconTooltip>(
-                                    channel_id as usize,
+                                .into_any()
+                        } else {
+                            Empty::new()
+                                .constrained()
+                                .with_width(collab_theme.channel_hash.width)
+                                .into_any()
+                        }
+                    })
+                    .on_click(MouseButton::Left, move |_, this, cx| {
+                        this.join_channel_chat(&JoinChannelChat { channel_id }, cx);
+                    })
+                    .with_tooltip::<ChatTooltip>(
+                        ix,
+                        "Open channel chat",
+                        None,
+                        theme.tooltip.clone(),
+                        cx,
+                    )
+                    .contained()
+                    .with_margin_right(4.),
+                )
+                .with_child(
+                    MouseEventHandler::new::<ChannelCall, _>(ix, cx, move |_, cx| {
+                        if row_hovered || channel.unseen_note_version.is_some() {
+                            Svg::new("icons/file.svg")
+                                .with_color(if channel.unseen_note_version.is_some() {
+                                    collab_theme.channel_note_active_color
+                                } else {
+                                    collab_theme.channel_hash.color
+                                })
+                                .constrained()
+                                .with_width(collab_theme.channel_hash.width)
+                                .contained()
+                                .with_margin_right(collab_theme.channel_hash.container.margin.left)
+                                .with_tooltip::<NotesTooltip>(
+                                    ix as usize,
                                     "Open channel notes",
                                     None,
                                     theme.tooltip.clone(),
@@ -2032,7 +2077,12 @@ impl CollabPanel {
                                 )
                                 .into_any()
                         } else {
-                            Empty::new().into_any()
+                            Empty::new()
+                                .constrained()
+                                .with_width(collab_theme.channel_hash.width)
+                                .contained()
+                                .with_margin_right(collab_theme.channel_hash.container.margin.left)
+                                .into_any()
                         }
                     })
                     .on_click(MouseButton::Left, move |_, this, cx| {
@@ -2189,6 +2239,7 @@ impl CollabPanel {
         channel_id: ChannelId,
         theme: &theme::CollabPanel,
         is_selected: bool,
+        ix: usize,
         cx: &mut ViewContext<Self>,
     ) -> AnyElement<Self> {
         enum ChannelNotes {}
@@ -2198,7 +2249,7 @@ impl CollabPanel {
             .or(theme.contact_avatar.height)
             .unwrap_or(0.);
 
-        MouseEventHandler::new::<ChannelNotes, _>(channel_id as usize, cx, |state, cx| {
+        MouseEventHandler::new::<ChannelNotes, _>(ix as usize, cx, |state, cx| {
             let tree_branch = *theme.tree_branch.in_state(is_selected).style_for(state);
             let row = theme.project_row.in_state(is_selected).style_for(state);
 
@@ -2709,11 +2760,9 @@ impl CollabPanel {
                                 .read(cx)
                                 .channel_id()?;
 
-                            dbg!(call_channel, channel.id);
                             Some(call_channel == channel.id)
                         })
                         .unwrap_or(false);
-                        dbg!(is_active);
                         if is_active {
                             self.open_channel_notes(
                                 &OpenChannelNotes {
@@ -3131,10 +3180,17 @@ impl CollabPanel {
         let window = cx.window();
         let active_call = ActiveCall::global(cx);
         cx.spawn(|_, mut cx| async move {
-            if active_call.read_with(&mut cx, |active_call, _| active_call.room().is_some()) {
+            if active_call.read_with(&mut cx, |active_call, cx| {
+                if let Some(room) = active_call.room() {
+                    let room = room.read(cx);
+                    room.is_sharing_project() && room.remote_participants().len() > 0
+                } else {
+                    false
+                }
+            }) {
                 let answer = window.prompt(
                     PromptLevel::Warning,
-                    "Do you want to leave the current call?",
+                    "Leaving this call will unshare your current project.\nDo you want to switch channels?",
                     &["Yes, Join Channel", "Cancel"],
                     &mut cx,
                 );
@@ -3150,27 +3206,16 @@ impl CollabPanel {
                 .update(&mut cx, |call, cx| call.join_channel(channel_id, cx))
                 .await?;
 
-            let tasks = room.update(&mut cx, |room, cx| {
-                let Some(workspace) = workspace.upgrade(cx) else {
-                    return vec![];
-                };
-                let projects = room.projects_to_join();
-
-                if projects.is_empty() {
-                    ChannelView::open(channel_id, workspace, cx).detach();
-                    return vec![];
-                }
-                room.projects_to_join()
-                    .into_iter()
-                    .map(|(project_id, user_id)| {
-                        let app_state = workspace.read(cx).app_state().clone();
-                        workspace::join_remote_project(project_id, user_id, app_state, cx)
-                    })
-                    .collect()
+            let task = room.update(&mut cx, |room, cx| {
+                let workspace = workspace.upgrade(cx)?;
+                let (project, host) = room.most_active_project()?;
+                let app_state = workspace.read(cx).app_state().clone();
+                Some(workspace::join_remote_project(project, host, app_state, cx))
             });
-            for task in tasks {
+            if let Some(task) = task {
                 task.await?;
             }
+
             anyhow::Ok(())
         })
         .detach_and_log_err(cx);

crates/gpui/Cargo.toml 🔗

@@ -53,7 +53,7 @@ thiserror.workspace = true
 time.workspace = true
 tiny-skia = "0.5"
 usvg = { version = "0.14", features = [] }
-uuid = { version = "1.1.2", features = ["v4"] }
+uuid.workspace = true
 waker-fn = "1.1.0"
 
 [build-dependencies]

crates/gpui/src/app.rs 🔗

@@ -1252,7 +1252,7 @@ impl AppContext {
                 result
             })
         } else {
-            panic!("circular model update");
+            panic!("circular model update for {}", std::any::type_name::<T>());
         }
     }
 

crates/gpui/src/views/select.rs 🔗

@@ -53,8 +53,10 @@ impl Select {
     }
 
     pub fn set_item_count(&mut self, count: usize, cx: &mut ViewContext<Self>) {
-        self.item_count = count;
-        cx.notify();
+        if count != self.item_count {
+            self.item_count = count;
+            cx.notify();
+        }
     }
 
     fn toggle(&mut self, cx: &mut ViewContext<Self>) {
@@ -63,9 +65,11 @@ impl Select {
     }
 
     pub fn set_selected_index(&mut self, ix: usize, cx: &mut ViewContext<Self>) {
-        self.selected_item_ix = ix;
-        self.is_open = false;
-        cx.notify();
+        if ix != self.selected_item_ix || self.is_open {
+            self.selected_item_ix = ix;
+            self.is_open = false;
+            cx.notify();
+        }
     }
 
     pub fn selected_index(&self) -> usize {

crates/rpc/proto/zed.proto 🔗

@@ -155,6 +155,7 @@ message Envelope {
         UpdateChannelBufferCollaborators update_channel_buffer_collaborators = 128;
         RejoinChannelBuffers rejoin_channel_buffers = 129;
         RejoinChannelBuffersResponse rejoin_channel_buffers_response = 130;
+        AckBufferOperation ack_buffer_operation = 143;
 
         JoinChannelChat join_channel_chat = 131;
         JoinChannelChatResponse join_channel_chat_response = 132;
@@ -165,10 +166,11 @@ message Envelope {
         GetChannelMessages get_channel_messages = 137;
         GetChannelMessagesResponse get_channel_messages_response = 138;
         RemoveChannelMessage remove_channel_message = 139;
+        AckChannelMessage ack_channel_message = 144;
 
         LinkChannel link_channel = 140;
         UnlinkChannel unlink_channel = 141;
-        MoveChannel move_channel = 142;
+        MoveChannel move_channel = 142; // current max: 144
     }
 }
 
@@ -955,6 +957,19 @@ message UpdateChannels {
     repeated uint64 remove_channel_invitations = 6;
     repeated ChannelParticipants channel_participants = 7;
     repeated ChannelPermission channel_permissions = 8;
+    repeated UnseenChannelMessage unseen_channel_messages = 9;
+    repeated UnseenChannelBufferChange unseen_channel_buffer_changes = 10;
+}
+
+message UnseenChannelMessage {
+    uint64 channel_id = 1;
+    uint64 message_id = 2;
+}
+
+message UnseenChannelBufferChange {
+    uint64 channel_id = 1;
+    uint64 epoch = 2;
+    repeated VectorClockEntry version = 3;
 }
 
 message ChannelEdge {
@@ -1060,6 +1075,11 @@ message RemoveChannelMessage {
     uint64 message_id = 2;
 }
 
+message AckChannelMessage {
+    uint64 channel_id = 1;
+    uint64 message_id = 2;
+}
+
 message SendChannelMessageResponse {
     ChannelMessage message = 1;
 }
@@ -1115,6 +1135,12 @@ message RejoinChannelBuffersResponse {
     repeated RejoinedChannelBuffer buffers = 1;
 }
 
+message AckBufferOperation {
+    uint64 buffer_id = 1;
+    uint64 epoch = 2;
+    repeated VectorClockEntry version = 3;
+}
+
 message JoinChannelBufferResponse {
     uint64 buffer_id = 1;
     uint32 replica_id = 2;

crates/rpc/src/proto.rs 🔗

@@ -271,6 +271,8 @@ messages!(
     (LeaveChannelBuffer, Background),
     (UpdateChannelBuffer, Foreground),
     (UpdateChannelBufferCollaborators, Foreground),
+    (AckBufferOperation, Background),
+    (AckChannelMessage, Background),
 );
 
 request_messages!(
@@ -406,7 +408,7 @@ entity_messages!(
     ChannelMessageSent,
     UpdateChannelBuffer,
     RemoveChannelMessage,
-    UpdateChannelBufferCollaborators
+    UpdateChannelBufferCollaborators,
 );
 
 const KIB: usize = 1024;

crates/semantic_index/Cargo.toml 🔗

@@ -26,7 +26,7 @@ postage.workspace = true
 futures.workspace = true
 ordered-float.workspace = true
 smol.workspace = true
-rusqlite = { version = "0.27.0", features = ["blob", "array", "modern_sqlite"] }
+rusqlite.workspace = true
 log.workspace = true
 tree-sitter.workspace = true
 lazy_static.workspace = true

crates/sqlez/Cargo.toml 🔗

@@ -7,10 +7,10 @@ publish = false
 [dependencies]
 anyhow.workspace = true
 indoc.workspace = true
-libsqlite3-sys = { version = "0.24", features = ["bundled"] }
+libsqlite3-sys = { version = "0.26", features = ["bundled"] }
 smol.workspace = true
 thread_local = "1.1.4"
 lazy_static.workspace = true
 parking_lot.workspace = true
 futures.workspace = true
-uuid = { version = "1.1.2", features = ["v4"] }
+uuid.workspace = true

crates/theme/src/theme.rs 🔗

@@ -239,6 +239,7 @@ pub struct CollabPanel {
     pub log_in_button: Interactive<ContainedText>,
     pub channel_editor: ContainerStyle,
     pub channel_hash: Icon,
+    pub channel_note_active_color: Color,
     pub tabbed_modal: TabbedModal,
     pub contact_finder: ContactFinder,
     pub channel_modal: ChannelModal,
@@ -252,7 +253,7 @@ pub struct CollabPanel {
     pub leave_call: Interactive<ContainedText>,
     pub contact_row: Toggleable<Interactive<ContainerStyle>>,
     pub channel_row: Toggleable<Interactive<ContainerStyle>>,
-    pub channel_name: ContainedText,
+    pub channel_name: Toggleable<ContainedText>,
     pub row_height: f32,
     pub project_row: Toggleable<Interactive<ProjectRow>>,
     pub tree_branch: Toggleable<Interactive<TreeBranch>>,

crates/workspace/Cargo.toml 🔗

@@ -51,7 +51,7 @@ serde.workspace = true
 serde_derive.workspace = true
 serde_json.workspace = true
 smallvec.workspace = true
-uuid = { version = "1.1.2", features = ["v4"] }
+uuid.workspace = true
 
 [dev-dependencies]
 call = { path = "../call", features = ["test-support"] }

crates/zed/Cargo.toml 🔗

@@ -138,7 +138,7 @@ tree-sitter-nu.workspace = true
 
 url = "2.2"
 urlencoding = "2.1.2"
-uuid = { version = "1.1.2", features = ["v4"] }
+uuid.workspace = true
 
 [dev-dependencies]
 call = { path = "../call", features = ["test-support"] }

styles/src/style_tree/collab_panel.ts 🔗

@@ -194,6 +194,7 @@ export default function contacts_panel(): any {
         },
         user_query_editor: filter_input,
         channel_hash: icon_style,
+        channel_note_active_color: foreground(layer, "active"),
         user_query_editor_height: 33,
         add_contact_button: header_icon_button,
         add_channel_button: header_icon_button,
@@ -267,10 +268,18 @@ export default function contacts_panel(): any {
         }),
         channel_row: item_row,
         channel_name: {
-            ...text(layer, "sans", { size: "sm" }),
-            margin: {
-                left: CHANNEL_SPACING,
+            active: {
+                ...text(layer, "sans", { size: "sm", weight: "bold" }),
+                margin: {
+                    left: CHANNEL_SPACING,
+                },
             },
+            inactive: {
+                ...text(layer, "sans", { size: "sm" }),
+                margin: {
+                    left: CHANNEL_SPACING,
+                },
+            }
         },
         list_empty_label_container: {
             margin: {