Add UdsIntegrationTests and UdsAsyncIntegrationTests

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/async/AbstractH2AsyncFundamentalsTest.java

@@ -69,7 +69,13 @@
 abstract class AbstractH2AsyncFundamentalsTest extends AbstractHttpAsyncFundamentalsTest {
 
     public AbstractH2AsyncFundamentalsTest(final URIScheme scheme, final ClientProtocolLevel clientProtocolLevel, final ServerProtocolLevel serverProtocolLevel) {
-        super(scheme, clientProtocolLevel, serverProtocolLevel);
+        this(scheme, clientProtocolLevel, serverProtocolLevel, false);
+    }
+
+    public AbstractH2AsyncFundamentalsTest(final URIScheme scheme, final ClientProtocolLevel clientProtocolLevel,
+                                           final ServerProtocolLevel serverProtocolLevel,
+                                           final boolean useUnixDomainSocket) {
+        super(scheme, clientProtocolLevel, serverProtocolLevel, useUnixDomainSocket);
     }
 
     @Test
@@ -203,4 +209,4 @@ public void cancelled() {
         }
     }
 
-}
+}

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/async/AbstractHttpAsyncFundamentalsTest.java

@@ -64,6 +64,12 @@ protected AbstractHttpAsyncFundamentalsTest(final URIScheme scheme, final Client
         super(scheme, clientProtocolLevel, serverProtocolLevel);
     }
 
+    protected AbstractHttpAsyncFundamentalsTest(final URIScheme scheme, final ClientProtocolLevel clientProtocolLevel,
+                                                final ServerProtocolLevel serverProtocolLevel,
+                                                final boolean useUnixDomainSocket) {
+        super(scheme, clientProtocolLevel, serverProtocolLevel, useUnixDomainSocket);
+    }
+
     @Test
     void testSequentialGetRequests() throws Exception {
         configureServer(bootstrap -> bootstrap.register("/random/*", AsyncRandomHandler::new));

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/async/TestHttp1Async.java

@@ -55,7 +55,11 @@
 abstract class TestHttp1Async extends AbstractHttpAsyncFundamentalsTest {
 
     public TestHttp1Async(final URIScheme scheme) {
-        super(scheme, ClientProtocolLevel.STANDARD, ServerProtocolLevel.STANDARD);
+        this(scheme, false);
+    }
+
+    public TestHttp1Async(final URIScheme scheme, final boolean useUnixDomainSocket) {
+        super(scheme, ClientProtocolLevel.STANDARD, ServerProtocolLevel.STANDARD, useUnixDomainSocket);
     }
 
     @ParameterizedTest(name = "{displayName}; concurrent connections: {0}")
@@ -201,4 +205,4 @@ void testRequestCancellation() throws Exception {
         }
     }
 
-}
+}

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/async/TestHttp1RequestReExecution.java

@@ -50,7 +50,11 @@
 abstract class TestHttp1RequestReExecution extends AbstractIntegrationTestBase {
 
     public TestHttp1RequestReExecution(final URIScheme scheme) {
-        super(scheme, ClientProtocolLevel.STANDARD, ServerProtocolLevel.STANDARD);
+        this(scheme, false);
+    }
+
+    public TestHttp1RequestReExecution(final URIScheme scheme, final boolean useUnixDomainSocket) {
+        super(scheme, ClientProtocolLevel.STANDARD, ServerProtocolLevel.STANDARD, useUnixDomainSocket);
     }
 
     @BeforeEach

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/async/UdsAsyncIntegrationTests.java

@@ -0,0 +1,68 @@
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package org.apache.hc.client5.testing.async;
+
+import org.apache.hc.core5.http.URIScheme;
+import org.apache.hc.core5.util.VersionInfo;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+
+import static org.apache.hc.core5.util.ReflectionUtils.determineJRELevel;
+import static org.junit.jupiter.api.Assumptions.assumeFalse;
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+class UdsAsyncIntegrationTests {
+
+    @Nested
+    @DisplayName("Fundamentals (HTTP/1.1)")
+    class Http1 extends TestHttp1Async {
+        public Http1() {
+            super(URIScheme.HTTP, true);
+            checkForUdsSupport();
+        }
+    }
+
+    @Nested
+    @DisplayName("Request re-execution (HTTP/1.1)")
+    class Http1RequestReExecution extends TestHttp1RequestReExecution {
+        public Http1RequestReExecution() {
+            super(URIScheme.HTTP, true);
+            checkForUdsSupport();
+        }
+    }
+
+    static void checkForUdsSupport() {
+        assumeTrue(determineJRELevel() >= 16, "Async UDS requires Java 16+");
+        final String[] components = VersionInfo
+            .loadVersionInfo("org.apache.hc.core5", UdsAsyncIntegrationTests.class.getClassLoader())
+            .getRelease()
+            .split("[-.]");
+        final int majorVersion = Integer.parseInt(components[0]);
+        final int minorVersion = Integer.parseInt(components[1]);
+        assumeFalse(majorVersion <= 5 && minorVersion <= 3, "Async UDS requires HttpCore 5.4+");
+    }
+}

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/extension/async/TestAsyncResources.java

@@ -87,6 +87,11 @@ public void afterEach(final ExtensionContext extensionContext) {
             client.close(CloseMode.GRACEFUL);
         }
         if (udsProxy != null) {
+            // The test harness enables UDS through a default RequestConfig set on the client. If a test case
+            // overrides the RequestConfig on a given request, it may connect directly to the test server by mistake.
+            if (udsProxy.getRequestsReceived() == 0) {
+                throw new AssertionError("The UDS proxy did not receive any requests");
+            }
             udsProxy.close();
         }
         if (server != null) {

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/extension/sync/TestClientResources.java

@@ -76,6 +76,11 @@ public void afterEach(final ExtensionContext extensionContext) {
             client.close(CloseMode.GRACEFUL);
         }
         if (udsProxy != null) {
+            // The test harness enables UDS through a default RequestConfig set on the client. If a test case
+            // overrides the RequestConfig on a given request, it may connect directly to the test server by mistake.
+            if (udsProxy.getRequestsReceived() == 0) {
+                throw new AssertionError("The UDS proxy did not receive any requests");
+            }
             udsProxy.close();
         }
         if (server != null) {

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/extension/sync/UnixDomainProxyServer.java

@@ -42,6 +42,7 @@
 import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicInteger;
 
 import static java.util.concurrent.CompletableFuture.supplyAsync;
 
@@ -50,6 +51,7 @@ public final class UnixDomainProxyServer {
     private final ExecutorService executorService;
     private final Path socketPath;
     private final CountDownLatch serverReady = new CountDownLatch(1);
+    private final AtomicInteger requestsReceived = new AtomicInteger(0);
     private volatile AFUNIXServerSocket serverSocket;
 
     public UnixDomainProxyServer(final int port) {
@@ -71,6 +73,10 @@ public Path getSocketPath() {
         return socketPath;
     }
 
+    public int getRequestsReceived() {
+        return requestsReceived.get();
+    }
+
     public void close() {
         try {
             serverSocket.close();
@@ -106,6 +112,7 @@ private void runUdsProxy() {
     private void serveRequests(final AFUNIXServerSocket server) throws IOException {
         while (true) {
             final AFUNIXSocket udsClient = server.accept();
+            requestsReceived.incrementAndGet();
             final Socket tcpSocket = new Socket("localhost", port);
             final CompletableFuture<Void> f1 = supplyAsync(() -> pipe(udsClient, tcpSocket), executorService);
             final CompletableFuture<Void> f2 = supplyAsync(() -> pipe(tcpSocket, udsClient), executorService);

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/sync/TestClientRequestExecution.java

@@ -74,7 +74,11 @@
 abstract class TestClientRequestExecution extends AbstractIntegrationTestBase {
 
     public TestClientRequestExecution(final URIScheme scheme) {
-        super(scheme, ClientProtocolLevel.STANDARD);
+        this(scheme, false);
+    }
+
+    public TestClientRequestExecution(final URIScheme scheme, final boolean useUnixDomainSocket) {
+        super(scheme, ClientProtocolLevel.STANDARD, useUnixDomainSocket);
     }
 
     private static class SimpleService implements HttpRequestHandler {

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/sync/TestContentCodings.java

@@ -66,7 +66,11 @@
 abstract class TestContentCodings extends AbstractIntegrationTestBase {
 
     protected TestContentCodings(final URIScheme scheme) {
-        super(scheme, ClientProtocolLevel.STANDARD);
+        this(scheme, false);
+    }
+
+    protected TestContentCodings(final URIScheme scheme, final boolean useUnixDomainSocket) {
+        super(scheme, ClientProtocolLevel.STANDARD, useUnixDomainSocket);
     }
 
     /**

httpclient5-testing/src/test/java/org/apache/hc/client5/testing/sync/UdsIntegrationTests.java

@@ -0,0 +1,60 @@
+/*
+ * ====================================================================
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ * ====================================================================
+ *
+ * This software consists of voluntary contributions made by many
+ * individuals on behalf of the Apache Software Foundation.  For more
+ * information on the Apache Software Foundation, please see
+ * <http://www.apache.org/>.
+ *
+ */
+package org.apache.hc.client5.testing.sync;
+
+import org.apache.hc.core5.http.URIScheme;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Nested;
+
+import static org.junit.jupiter.api.Assumptions.assumeTrue;
+
+class UdsIntegrationTests {
+    @Nested
+    @DisplayName("Request execution (HTTP/1.1)")
+    class RequestExecution extends TestClientRequestExecution {
+        public RequestExecution() {
+            super(URIScheme.HTTP, true);
+        }
+    }
+
+    @Nested
+    @DisplayName("Request execution (HTTP/1.1, TLS)")
+    class RequestExecutionTls extends TestClientRequestExecution {
+        public RequestExecutionTls() {
+            super(URIScheme.HTTPS, true);
+            assumeTrue(false, "HTTPS is not currently supported over Unix domain sockets");
+        }
+    }
+
+    @Nested
+    @DisplayName("Content coding (HTTP/1.1)")
+    class ContentCoding extends TestContentCodings {
+        public ContentCoding() {
+            super(URIScheme.HTTP, true);
+        }
+    }
+}