1use serde::Deserialize;
2use std::{env, path::PathBuf, process::Command};
3
4#[derive(Debug, Deserialize)]
5#[serde(rename_all = "camelCase")]
6pub struct SwiftTargetInfo {
7 pub triple: String,
8 pub unversioned_triple: String,
9 pub module_triple: String,
10 pub swift_runtime_compatibility_version: String,
11 #[serde(rename = "librariesRequireRPath")]
12 pub libraries_require_rpath: bool,
13}
14
15#[derive(Debug, Deserialize)]
16#[serde(rename_all = "camelCase")]
17pub struct SwiftPaths {
18 pub runtime_library_paths: Vec<String>,
19 pub runtime_library_import_paths: Vec<String>,
20 pub runtime_resource_path: String,
21}
22
23#[derive(Debug, Deserialize)]
24pub struct SwiftTarget {
25 pub target: SwiftTargetInfo,
26 pub paths: SwiftPaths,
27}
28
29const MACOS_TARGET_VERSION: &str = "12";
30
31fn main() {
32 let swift_target = get_swift_target();
33
34 build_bridge(&swift_target);
35 link_swift_stdlib(&swift_target);
36 link_webrtc_framework(&swift_target);
37}
38
39fn build_bridge(swift_target: &SwiftTarget) {
40 println!("cargo:rerun-if-changed={}/Sources", SWIFT_PACKAGE_NAME);
41 println!(
42 "cargo:rerun-if-changed={}/Package.swift",
43 SWIFT_PACKAGE_NAME
44 );
45 let swift_package_root = swift_package_root();
46 if !Command::new("swift")
47 .args(&["build", "-c", &env::var("PROFILE").unwrap()])
48 .current_dir(&swift_package_root)
49 .status()
50 .unwrap()
51 .success()
52 {
53 panic!(
54 "Failed to compile swift package in {}",
55 swift_package_root.display()
56 );
57 }
58
59 println!(
60 "cargo:rustc-link-search=native={}",
61 swift_target.out_dir_path().display()
62 );
63 println!("cargo:rustc-link-lib=static={}", SWIFT_PACKAGE_NAME);
64}
65
66fn link_swift_stdlib(swift_target: &SwiftTarget) {
67 if swift_target.target.libraries_require_rpath {
68 panic!("Libraries require RPath! Change minimum MacOS value to fix.")
69 }
70
71 swift_target
72 .paths
73 .runtime_library_paths
74 .iter()
75 .for_each(|path| {
76 println!("cargo:rustc-link-search=native={}", path);
77 });
78}
79
80fn link_webrtc_framework(swift_target: &SwiftTarget) {
81 let swift_out_dir_path = swift_target.out_dir_path();
82 println!("cargo:rustc-link-lib=framework=WebRTC");
83 println!(
84 "cargo:rustc-link-search=framework={}",
85 swift_out_dir_path.display()
86 );
87
88 let source_path = swift_out_dir_path.join("WebRTC.framework");
89 let target_path = PathBuf::from(env::var("OUT_DIR").unwrap()).join("../../../WebRTC.framework");
90 assert!(
91 Command::new("cp")
92 .arg("-r")
93 .args(&[&source_path, &target_path])
94 .status()
95 .unwrap()
96 .success(),
97 "could not copy WebRTC.framework from {:?} to {:?}",
98 source_path,
99 target_path
100 );
101}
102
103fn get_swift_target() -> SwiftTarget {
104 let mut arch = env::var("CARGO_CFG_TARGET_ARCH").unwrap();
105 if arch == "aarch64" {
106 arch = "arm64".into();
107 }
108 let target = format!("{}-apple-macosx{}", arch, MACOS_TARGET_VERSION);
109
110 let swift_target_info_str = Command::new("swift")
111 .args(&["-target", &target, "-print-target-info"])
112 .output()
113 .unwrap()
114 .stdout;
115
116 serde_json::from_slice(&swift_target_info_str).unwrap()
117}
118
119const SWIFT_PACKAGE_NAME: &'static str = "LiveKitBridge";
120
121fn swift_package_root() -> PathBuf {
122 env::current_dir().unwrap().join(SWIFT_PACKAGE_NAME)
123}
124
125impl SwiftTarget {
126 fn out_dir_path(&self) -> PathBuf {
127 swift_package_root()
128 .join(".build")
129 .join(&self.target.unversioned_triple)
130 .join(env::var("PROFILE").unwrap())
131 }
132}