1use serde::Deserialize;
2use std::{
3 env,
4 path::{Path, PathBuf},
5 process::Command,
6};
7
8const SWIFT_PACKAGE_NAME: &str = "LiveKitBridge";
9
10#[derive(Debug, Deserialize)]
11#[serde(rename_all = "camelCase")]
12pub struct SwiftTargetInfo {
13 pub triple: String,
14 pub unversioned_triple: String,
15 pub module_triple: String,
16 pub swift_runtime_compatibility_version: String,
17 #[serde(rename = "librariesRequireRPath")]
18 pub libraries_require_rpath: bool,
19}
20
21#[derive(Debug, Deserialize)]
22#[serde(rename_all = "camelCase")]
23pub struct SwiftPaths {
24 pub runtime_library_paths: Vec<String>,
25 pub runtime_library_import_paths: Vec<String>,
26 pub runtime_resource_path: String,
27}
28
29#[derive(Debug, Deserialize)]
30pub struct SwiftTarget {
31 pub target: SwiftTargetInfo,
32 pub paths: SwiftPaths,
33}
34
35const MACOS_TARGET_VERSION: &str = "10.15.7";
36
37fn main() {
38 if cfg!(not(any(test, feature = "test-support"))) {
39 let swift_target = get_swift_target();
40
41 build_bridge(&swift_target);
42 link_swift_stdlib(&swift_target);
43 link_webrtc_framework(&swift_target);
44
45 // Register exported Objective-C selectors, protocols, etc when building example binaries.
46 println!("cargo:rustc-link-arg=-Wl,-ObjC");
47 }
48}
49
50fn build_bridge(swift_target: &SwiftTarget) {
51 println!("cargo:rerun-if-env-changed=MACOSX_DEPLOYMENT_TARGET");
52 println!("cargo:rerun-if-changed={}/Sources", SWIFT_PACKAGE_NAME);
53 println!(
54 "cargo:rerun-if-changed={}/Package.swift",
55 SWIFT_PACKAGE_NAME
56 );
57 println!(
58 "cargo:rerun-if-changed={}/Package.resolved",
59 SWIFT_PACKAGE_NAME
60 );
61
62 let swift_package_root = swift_package_root();
63 let swift_target_folder = swift_target_folder();
64 if !Command::new("swift")
65 .arg("build")
66 .arg("--disable-automatic-resolution")
67 .args(["--configuration", &env::var("PROFILE").unwrap()])
68 .args(["--triple", &swift_target.target.triple])
69 .args(["--build-path".into(), swift_target_folder])
70 .current_dir(&swift_package_root)
71 .status()
72 .unwrap()
73 .success()
74 {
75 panic!(
76 "Failed to compile swift package in {}",
77 swift_package_root.display()
78 );
79 }
80
81 println!(
82 "cargo:rustc-link-search=native={}",
83 swift_target.out_dir_path().display()
84 );
85 println!("cargo:rustc-link-lib=static={}", SWIFT_PACKAGE_NAME);
86}
87
88fn link_swift_stdlib(swift_target: &SwiftTarget) {
89 for path in &swift_target.paths.runtime_library_paths {
90 println!("cargo:rustc-link-search=native={}", path);
91 }
92}
93
94fn link_webrtc_framework(swift_target: &SwiftTarget) {
95 let swift_out_dir_path = swift_target.out_dir_path();
96 println!("cargo:rustc-link-lib=framework=WebRTC");
97 println!(
98 "cargo:rustc-link-search=framework={}",
99 swift_out_dir_path.display()
100 );
101 // Find WebRTC.framework as a sibling of the executable when running tests.
102 println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path");
103 // Find WebRTC.framework in parent directory of the executable when running examples.
104 println!("cargo:rustc-link-arg=-Wl,-rpath,@executable_path/..");
105
106 let source_path = swift_out_dir_path.join("WebRTC.framework");
107 let deps_dir_path =
108 PathBuf::from(env::var("OUT_DIR").unwrap()).join("../../../deps/WebRTC.framework");
109 let target_dir_path =
110 PathBuf::from(env::var("OUT_DIR").unwrap()).join("../../../WebRTC.framework");
111 copy_dir(&source_path, &deps_dir_path);
112 copy_dir(&source_path, &target_dir_path);
113}
114
115fn get_swift_target() -> SwiftTarget {
116 let mut arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
117 if arch == "aarch64" {
118 arch = "arm64".into();
119 }
120 let target = format!("{}-apple-macosx{}", arch, MACOS_TARGET_VERSION);
121
122 let swift_target_info_str = Command::new("swift")
123 .args(["-target", &target, "-print-target-info"])
124 .output()
125 .unwrap()
126 .stdout;
127
128 serde_json::from_slice(&swift_target_info_str).unwrap()
129}
130
131fn swift_package_root() -> PathBuf {
132 env::current_dir().unwrap().join(SWIFT_PACKAGE_NAME)
133}
134
135fn swift_target_folder() -> PathBuf {
136 env::current_dir()
137 .unwrap()
138 .join(format!("../../target/{SWIFT_PACKAGE_NAME}"))
139}
140
141fn copy_dir(source: &Path, destination: &Path) {
142 assert!(
143 Command::new("rm")
144 .arg("-rf")
145 .arg(destination)
146 .status()
147 .unwrap()
148 .success(),
149 "could not remove {:?} before copying",
150 destination
151 );
152
153 assert!(
154 Command::new("cp")
155 .arg("-R")
156 .args([source, destination])
157 .status()
158 .unwrap()
159 .success(),
160 "could not copy {:?} to {:?}",
161 source,
162 destination
163 );
164}
165
166impl SwiftTarget {
167 fn out_dir_path(&self) -> PathBuf {
168 swift_target_folder()
169 .join(&self.target.unversioned_triple)
170 .join(env::var("PROFILE").unwrap())
171 }
172}