CI: add wasm test build

.github/workflows/test.yaml

@@ -40,3 +40,22 @@ jobs:
           cmake -D CMAKE_BUILD_TYPE=Debug ..
           cmake --build .
           ctest . -C Debug
+
+  embuild:
+    # Just build with emscripten. There is no way to test the build yet.
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Setup emsdk
+        uses: mymindstorm/setup-emsdk@6ab9eb1bda2574c4ddb79809fc9247783eaf9021
+        with:
+          version: 4.0.21
+          actions-cache-folder: 'emsdk-cache'
+      - name: Verify emsdk
+        run: emcc -v
+      - name: build
+        run: |
+          mkdir build
+          cd build/
+          emcmake cmake ..
+          emmake make

test/CMakeLists.txt

@@ -10,9 +10,16 @@ FetchContent_Declare(
 FetchContent_Declare(
         websocketpp
         URL https://github.com/zaphoyd/websocketpp/archive/4dfe1be74e684acca19ac1cf96cce0df9eac2a2d.zip)
+# Desktop-only, without submodule:
+#FetchContent_Declare(
+#        wswrap
+#        URL https://github.com/black-sliver/wswrap/archive/e71695c80e0338d0aa4f18e7e0f45b67681206be.zip)
+# Complete, with submodule:
 FetchContent_Declare(
         wswrap
-        URL https://github.com/black-sliver/wswrap/archive/e71695c80e0338d0aa4f18e7e0f45b67681206be.zip)
+        GIT_REPOSITORY https://github.com/black-sliver/wswrap.git
+        GIT_TAG e71695c80e0338d0aa4f18e7e0f45b67681206be)
+
 FetchContent_MakeAvailable(asio json websocketpp wswrap)
 
 add_executable(TestBasic test_basic.cpp)
@@ -65,6 +72,16 @@ set_target_properties(TestBasic PROPERTIES
         CXX_EXTENSIONS NO
 )
 
+if(EMSCRIPTEN)
+    message("Configuring TestBasic for emscripten")
+    # embind requires C++17
+    set_target_properties(TestBasic PROPERTIES
+            CXX_STANDARD 17
+            CXX_STANDARD_REQUIRED YES
+    )
+    target_link_options(TestBasic BEFORE PRIVATE "--bind")
+endif()
+
 # enable more warnings
 if(MSVC)
     target_compile_options(TestBasic PRIVATE /W4)

test/test_basic.cpp

@@ -4,11 +4,13 @@
 #include <chrono>
 #include <cstdio>
 #include <thread>
-#include <websocketpp/server.hpp>
-#include <websocketpp/config/asio_no_tls.hpp>
 
 #define usleep(usec) std::this_thread::sleep_for(std::chrono::microseconds(usec))
 
+#ifndef EMSCRIPTEN // we can not run websocket server in wasm
+#include <websocketpp/server.hpp>
+#include <websocketpp/config/asio_no_tls.hpp>
+
 typedef websocketpp::server<websocketpp::config::asio> Server;
 
 class TestServer final {
@@ -85,9 +87,11 @@ class TestServer final {
         server.send(hdl, roomInfo, websocketpp::frame::opcode::text);
     }
 };
+#endif // ndef EMSCRIPTEN
 
 int main(int, char**)
 {
+#ifndef EMSCRIPTEN // we can not run websocket server in wasm
     printf("Starting server...\n");
     TestServer server{38281, 38291};
     std::thread serverThread(&TestServer::run, &server);
@@ -99,13 +103,17 @@ int main(int, char**)
     if (!server.is_listening())
         throw std::runtime_error("Timeout starting server");
     printf("Server listening on %d\n", static_cast<int>(server.get_port()));
+    const auto port = server.get_port();
+#else // !ndef EMSCRIPTEN
+    const uint16_t port = 38281;
+#endif // ndef EMSCRIPTEN
 
     bool error = false;
     bool connected = false;
     bool roomInfo = false;
     bool releaseMode = false;
     {
-        const std::string uri = "ws://localhost:" + std::to_string(server.get_port());
+        const std::string uri = "ws://localhost:" + std::to_string(port);
 
         printf("Starting client for %s...\n", uri.c_str());
         APClient ap{"", "", uri};
@@ -141,9 +149,11 @@ int main(int, char**)
         // FIXME: ~APClient can throw
     }
 
+#ifndef EMSCRIPTEN // we can not run websocket server in wasm
     printf("Stopping server...\n");
     server.stop();
     serverThread.join();
+#endif // ndef EMSCRIPTEN
 
     if (!connected) {
         fprintf(stderr, "FAIL: Could not connect socket\n");