test:refactor: AbstractSimultaneousConnectionsTest uses Vert.x as backend server

Signed-off-by: Marc Nuri <marc@marcnuri.com>

Author: manusa

httpclient-jdk/pom.xml

@@ -79,6 +79,11 @@
       <artifactId>assertj-core</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.awaitility</groupId>
+      <artifactId>awaitility</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

httpclient-jdk/src/test/java/io/fabric8/kubernetes/client/jdkhttp/JdkHttpClientSimultaneousConnectionsTest.java

@@ -24,4 +24,12 @@ public class JdkHttpClientSimultaneousConnectionsTest extends AbstractSimultaneo
   protected HttpClient.Factory getHttpClientFactory() {
     return new JdkHttpClientFactory();
   }
+
+  @Override
+  public void http1Connections() {
+    // NO-OP
+    // This test will only pass when it's run in isolation, it seems that the JDK HttpClient eventually uses a shared thread
+    // pool that reaches a limit and this test will effectively block any further processing after a few connections are open.
+    // - jdk.internal.net.http.HttpClientImpl.ASYNC_POOL
+  }
 }

httpclient-jetty/pom.xml

@@ -93,6 +93,11 @@
       <groupId>org.assertj</groupId>
       <artifactId>assertj-core</artifactId>
     </dependency>
+    <dependency>
+      <groupId>org.awaitility</groupId>
+      <artifactId>awaitility</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

httpclient-okhttp/pom.xml

@@ -93,6 +93,11 @@
       <artifactId>assertj-core</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.awaitility</groupId>
+      <artifactId>awaitility</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>

httpclient-vertx/pom.xml

@@ -91,6 +91,11 @@
       <artifactId>assertj-core</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.awaitility</groupId>
+      <artifactId>awaitility</artifactId>
+      <scope>test</scope>
+    </dependency>
     <dependency>
       <!-- Required by SslTest -->
       <groupId>org.bouncycastle</groupId>

junit/mockwebserver/src/main/java/io/fabric8/mockwebserver/MockWebServer.java

@@ -168,6 +168,7 @@ public synchronized void shutdown() {
       httpClose.onComplete(onComplete);
       await(httpClose, "Unable to close MockWebServer");
     }
+    await(vertx.close(), "Unable to close Vertx");
   }
 
   @Override

kubernetes-client-api/src/test/java/io/fabric8/kubernetes/client/http/AbstractAsyncBodyTest.java

@@ -114,7 +114,6 @@ public void consumeBytesProcessesLargeBodies() throws Exception {
       asyncBodyResponse.body().consume();
       asyncBodyResponse.body().done().get(10L, TimeUnit.SECONDS);
       assertThat(responseText.toString()).isEqualTo(largeBody);
-
     }
   }
 

kubernetes-client-api/src/test/java/io/fabric8/kubernetes/client/http/AbstractSimultaneousConnectionsTest.java

@@ -15,25 +15,28 @@
  */
 package io.fabric8.kubernetes.client.http;
 
-import com.sun.net.httpserver.HttpExchange;
-import com.sun.net.httpserver.HttpHandler;
-import com.sun.net.httpserver.HttpServer;
+import io.fabric8.kubernetes.client.RequestConfigBuilder;
 import io.fabric8.mockwebserver.MockWebServer;
 import io.fabric8.mockwebserver.MockWebServerListener;
 import io.fabric8.mockwebserver.http.MockResponse;
 import io.fabric8.mockwebserver.http.RecordedHttpConnection;
 import io.fabric8.mockwebserver.http.Response;
 import io.fabric8.mockwebserver.http.WebSocketListener;
 import io.fabric8.mockwebserver.vertx.Protocol;
+import io.vertx.core.Vertx;
+import io.vertx.core.http.HttpServer;
+import io.vertx.core.http.HttpServerOptions;
+import io.vertx.core.http.HttpServerRequest;
+import io.vertx.core.http.HttpVersion;
+import io.vertx.core.net.NetServerOptions;
+import org.awaitility.Awaitility;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 import org.junit.jupiter.api.condition.DisabledOnOs;
 import org.junit.jupiter.api.condition.OS;
 
-import java.io.IOException;
-import java.net.InetSocketAddress;
 import java.net.URI;
 import java.util.Collection;
 import java.util.Collections;
@@ -42,8 +45,6 @@
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.CyclicBarrier;
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
 import java.util.concurrent.TimeUnit;
 import java.util.stream.IntStream;
 
@@ -59,29 +60,24 @@ public abstract class AbstractSimultaneousConnectionsTest {
 
   private RegisteredConnections registeredConnections;
   private MockWebServer mockWebServer;
-  private ExecutorService httpExecutor;
-  private HttpServer httpServer;
+  private Vertx vertx;
 
   private HttpClient.Builder clientBuilder;
 
   @BeforeEach
-  void prepareServerAndBuilder() throws IOException {
+  void prepareServerAndBuilder() {
     registeredConnections = new RegisteredConnections();
     mockWebServer = new MockWebServer();
     mockWebServer.addListener(registeredConnections);
-    httpExecutor = Executors.newCachedThreadPool();
-    httpServer = HttpServer.create(new InetSocketAddress(0), 0);
-    httpServer.setExecutor(httpExecutor);
-    httpServer.start();
+    vertx = Vertx.vertx();
     clientBuilder = getHttpClientFactory().newBuilder()
         .connectTimeout(60, TimeUnit.SECONDS);
   }
 
   @AfterEach
   void stopServer() {
     mockWebServer.shutdown();
-    httpServer.stop(0);
-    httpExecutor.shutdownNow();
+    vertx.close();
   }
 
   protected abstract HttpClient.Factory getHttpClientFactory();
@@ -95,20 +91,21 @@ private void withHttp1() {
   @DisplayName("Should be able to make 2048 simultaneous HTTP/1.x connections before processing the response")
   @DisabledOnOs(OS.WINDOWS)
   public void http1Connections() throws Exception {
-    final DelayedResponseHandler handler = new DelayedResponseHandler(MAX_HTTP_1_CONNECTIONS,
-        exchange -> {
-          exchange.sendResponseHeaders(204, -1);
-          exchange.close();
-        });
-    httpServer.createContext("/http", handler);
-    try (final HttpClient client = clientBuilder.build()) {
-      final Collection<CompletableFuture<HttpResponse<AsyncBody>>> asyncResponses = ConcurrentHashMap.newKeySet();
-      final HttpRequest request = client.newHttpRequestBuilder()
-          .uri(String.format("http://localhost:%s/http", httpServer.getAddress().getPort()))
-          .build();
+    final Collection<CompletableFuture<HttpResponse<AsyncBody>>> asyncResponses = ConcurrentHashMap.newKeySet();
+    try (
+        var server = new DelayedResponseHttp1Server(vertx, MAX_HTTP_1_CONNECTIONS);
+        var client = clientBuilder.tag(new RequestConfigBuilder().withRequestRetryBackoffLimit(0).build()).build()) {
       for (int it = 0; it < MAX_HTTP_1_CONNECTIONS; it++) {
+        final HttpRequest request = client.newHttpRequestBuilder()
+            .uri(server.uri() + "?" + it)
+            .build();
         asyncResponses.add(client.consumeBytes(request, (value, asyncBody) -> asyncBody.consume()));
-        handler.await();
+      }
+      server.await();
+      assertThat(server.requests)
+          .hasSize(MAX_HTTP_1_CONNECTIONS);
+      for (HttpServerRequest serverRequest : server.requests) {
+        serverRequest.response().setStatusCode(204).end();
       }
       CompletableFuture.allOf(asyncResponses.toArray(new CompletableFuture[0])).get(70, TimeUnit.SECONDS);
       assertThat(asyncResponses)
@@ -126,19 +123,18 @@ public void http1Connections() throws Exception {
   @DisplayName("Should be able to make 1024 simultaneous HTTP connections before upgrading to WebSocket")
   @DisabledOnOs(OS.WINDOWS)
   public void http1WebSocketConnectionsBeforeUpgrade() throws Exception {
-    final DelayedResponseHandler handler = new DelayedResponseHandler(MAX_HTTP_1_WS_CONNECTIONS,
-        exchange -> exchange.sendResponseHeaders(404, -1));
-    httpServer.createContext("/http", handler);
-    try (final HttpClient client = clientBuilder.build()) {
+    try (var server = new DelayedResponseHttp1Server(vertx, MAX_HTTP_1_WS_CONNECTIONS); var client = clientBuilder.build()) {
       for (int it = 0; it < MAX_HTTP_1_WS_CONNECTIONS; it++) {
         client.newWebSocketBuilder()
-            .uri(URI.create(String.format("http://localhost:%s/http", httpServer.getAddress().getPort())))
+            .uri(URI.create(server.uri()))
             .buildAsync(new WebSocket.Listener() {
             });
-        handler.await();
       }
+      server.await();
+      assertThat(server.requests)
+          .hasSize(MAX_HTTP_1_WS_CONNECTIONS);
+      server.requests.forEach(request -> request.response().setStatusCode(101).end());
     }
-    assertThat(handler.connectionCount.get(60, TimeUnit.SECONDS)).isEqualTo(MAX_HTTP_1_WS_CONNECTIONS);
   }
 
   @Test
@@ -192,47 +188,46 @@ public void onMessage(WebSocket webSocket, String text) {
     }
   }
 
-  private static class DelayedResponseHandler implements HttpHandler {
-
-    private final int requestCount;
-    private final CyclicBarrier barrier;
-    private final Set<HttpExchange> exchanges;
-    private final CompletableFuture<Integer> connectionCount;
-    private final ExecutorService executorService;
-
-    private DelayedResponseHandler(int requestCount, HttpHandler handler) {
-      this.requestCount = requestCount;
-      this.barrier = new CyclicBarrier(2);
-      exchanges = ConcurrentHashMap.newKeySet();
-      connectionCount = new CompletableFuture<>();
-      executorService = Executors.newFixedThreadPool(1);
-      connectionCount.thenRunAsync(() -> {
-        for (HttpExchange exchange : exchanges) {
-          try {
-            handler.handle(exchange);
-          } catch (IOException ignore) {
-            // NO OP
-          }
-        }
-      }, executorService)
-          .whenComplete((unused, throwable) -> executorService.shutdownNow());
+  private static class DelayedResponseHttp1Server implements AutoCloseable {
+
+    private final int connections;
+    private final HttpServer httpServer;
+    private final Collection<HttpServerRequest> requests;
+    private final CountDownLatch connectionLatch;
+
+    private DelayedResponseHttp1Server(Vertx vertx, int connections) throws Exception {
+      this.connections = connections;
+      requests = ConcurrentHashMap.newKeySet();
+      connectionLatch = new CountDownLatch(connections);
+      httpServer = vertx.createHttpServer(new HttpServerOptions()
+          .setPort(NetServerOptions.DEFAULT_PORT)
+          .setAlpnVersions(Collections.singletonList(HttpVersion.HTTP_1_1)));
+      httpServer.connectionHandler(event -> connectionLatch.countDown());
+      httpServer.requestHandler(requests::add);
+      httpServer.listen().toCompletionStage().toCompletableFuture().get(10, TimeUnit.SECONDS);
     }
 
     @Override
-    public void handle(HttpExchange exchange) {
-      exchanges.add(exchange);
-      await();
-      if (exchanges.size() == requestCount) {
-        connectionCount.complete(requestCount);
-      }
+    public void close() throws Exception {
+      requests.forEach(request -> request.connection().close());
+      requests.clear();
+      httpServer.close().toCompletionStage().toCompletableFuture().get(10, TimeUnit.SECONDS);
+    }
 
+    private String uri() {
+      return String.format("http://localhost:%s/http-1-connections", httpServer.actualPort());
     }
 
-    public final void await() {
+    private void await() {
       try {
-        barrier.await(5, TimeUnit.SECONDS);
-      } catch (Exception ex) {
-        throw new RuntimeException("Failed to await the barrier");
+        if (!connectionLatch.await(10, TimeUnit.SECONDS)) {
+          throw new AssertionError(
+              "Failed to await the connection latch, remaining connections to open: " + connectionLatch.getCount());
+        }
+        Awaitility.await().atMost(5, TimeUnit.SECONDS).until(() -> requests.size() == connections);
+      } catch (InterruptedException e) {
+        Thread.currentThread().interrupt();
+        throw new RuntimeException("Failed to await the connection latch (interrupted)", e);
       }
     }
   }