feat ci: fix builds and runs of websocket tests on CI

Tests: протестировано CI
commit_hash:c7e6fa3f9d7452dfa8a86726c64ea2cf35dab753

Author: apolukhin

.github/workflows/ci.yml

@@ -44,7 +44,9 @@ jobs:
                     id: ubuntu24_clang18_debug_sanitize-addr-ub
                     # Sanitizer consumes too much virtual memory and Subprocess tests fail with:
                     # "Error while fork: Cannot allocate memory" (std::system_error)
-                    tests-flags: '--gtest_filter=-Subprocess.*'
+                    #
+                    # curl lacks ws:// support
+                    tests-flags: '--gtest_filter=-Subprocess.*:HttpClientWebSocket.*'
                     tests-env: ''
 
                   - cmake-flags: >-
@@ -63,7 +65,7 @@ jobs:
                     os: ubuntu-24.04
                     info: gcc-13 + release
                     id: ubuntu24_gcc13_release
-                    tests-flags: '--gtest_filter=-StackUsageMonitorTest.BacktraceLogging'
+                    tests-flags: '--gtest_filter=-StackUsageMonitorTest.BacktraceLogging:HttpClientWebSocket.*'
                     tests-env: ''
 
         name: '${{matrix.os}}: ${{matrix.info}}'

core/src/clients/http/websocket_response.cpp

@@ -2,6 +2,7 @@
 
 #include <algorithm>
 #include <cstring>
+#include <span>
 #include <string_view>
 
 #include <curl-ev/native.hpp>
@@ -72,6 +73,19 @@ void AppendFrame(
     out.append(payload);
 }
 
+template <class Easy, class MetaPtr>
+auto WorkaroundCurlWsRecv(Easy* easy, std::span<char> buffer, size_t& nread, MetaPtr& meta) {
+    if constexpr (requires { curl::native::curl_ws_recv(easy, buffer.data(), buffer.size(), &nread, &meta); }) {
+        return curl::native::curl_ws_recv(easy, buffer.data(), buffer.size(), &nread, &meta);
+    } else {
+        // old curl libraries have no `const`
+        curl::native::curl_ws_frame* meta_nonconst = nullptr;
+        const auto code = curl::native::curl_ws_recv(easy, buffer.data(), buffer.size(), &nread, &meta_nonconst);
+        meta = meta_nonconst;
+        return code;
+    }
+}
+
 // Drain post-upgrade WebSocket bytes buffered by libcurl CONNECT_ONLY=2.
 //
 // Why we cannot just return curl's buffer "as is" on libcurl 8.17:
@@ -104,8 +118,9 @@ std::string DrainCurlWebSocketPreambleImpl(curl::native::CURL* easy) {
     while (true) {
         char buffer[kWsRecvChunkSize];
         size_t nread = 0;
+
         const curl::native::curl_ws_frame* meta = nullptr;
-        const auto rc = curl::native::curl_ws_recv(easy, buffer, sizeof(buffer), &nread, &meta);
+        const auto rc = WorkaroundCurlWsRecv(easy, buffer, nread, meta);
 
         if (rc == curl::native::CURLE_AGAIN) {
             break;