Static C bridge support (#1008)

Author: cretz

.github/workflows/per-pr.yml

@@ -177,3 +177,27 @@ jobs:
           compose-file: ./docker/docker-compose-ci.yaml
       - uses: Swatinem/rust-cache@v2
       - run: cargo integ-test docker_
+
+  c-bridge-static-link-test:
+    name: "C bridge static link test"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: dtolnay/rust-toolchain@stable
+        with:
+          toolchain: 1.88.0
+      - name: Install protoc
+        uses: arduino/setup-protoc@v3
+        with:
+          # TODO: Upgrade proto once https://github.com/arduino/setup-protoc/issues/99 is fixed
+          version: "23.x"
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Build crate as static library
+        run: cargo rustc --package temporal-sdk-core-c-bridge --features xz2-static -- --crate-type=staticlib
+
+      - name: Build C test program
+        run: gcc -I./core-c-bridge/include tests/c_bridge_smoke_test.c target/debug/deps/libtemporal_sdk_core_c_bridge.a -lpthread -ldl -lm -o test
+
+      - name: Run C test program
+        run: ./test

core-c-bridge/Cargo.toml

@@ -26,6 +26,8 @@ tokio-util = "0.7"
 tonic = { workspace = true }
 tracing = "0.1"
 url = "2.5"
+# This is only needed as an explicit dependency so we can enable static as a feature
+xz2 = { version = "0.1" }
 
 [dependencies.temporal-client]
 path = "../client"
@@ -44,6 +46,8 @@ path = "../sdk-core-protos"
 futures-util = "0.3"
 thiserror = { workspace = true }
 
-
 [build-dependencies]
 cbindgen = { version = "0.29", default-features = false }
+
+[features]
+xz2-static = ["xz2/static"]

core/Cargo.toml

@@ -116,7 +116,8 @@ tracing-subscriber = { version = "0.3", default-features = false, features = [
 ] }
 url = "2.5"
 uuid = { version = "1.18", features = ["v4"] }
-zip = { version = "4.6", optional = true }
+# Only need specific features to decompress zip files for ephemeral server download
+zip = { version = "4.6", optional = true, default-features = false, features = ["deflate", "bzip2", "zstd"] }
 
 # 1st party local deps
 [dependencies.temporal-sdk-core-api]

tests/c_bridge_smoke_test.c

@@ -0,0 +1,10 @@
+#include "temporal-sdk-core-c-bridge.h"
+#include <stdio.h>
+
+int main(void) {
+    // Just do something simple to confirm the bridge works
+    struct TemporalCoreCancellationToken *tok = temporal_core_cancellation_token_new();
+    temporal_core_cancellation_token_free(tok);
+    printf("C bridge smoke test passed!\n");
+    return 0;
+}