NC-1378: Adding error handling to http requests on websocket endpoint (#213)

ethereum/jsonrpc/src/main/java/tech/pegasys/pantheon/ethereum/jsonrpc/websocket/WebSocketService.java

@@ -22,6 +22,7 @@ import io.vertx.core.Handler;
 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.ServerWebSocket;
 import io.vertx.core.net.SocketAddress;
 import org.apache.logging.log4j.LogManager;
@@ -62,6 +63,7 @@ public class WebSocketService {
                     .setPort(configuration.getPort())
                     .setWebsocketSubProtocols("undefined"))
             .websocketHandler(websocketHandler())
+            .requestHandler(httpHandler())
             .listen(startHandler(resultFuture));
 
     return resultFuture;
@@ -103,6 +105,11 @@ public class WebSocketService {
     };
   }
 
+  private Handler<HttpServerRequest> httpHandler() {
+    return http ->
+        http.response().setStatusCode(400).end("Websocket endpoint can't handle HTTP requests");
+  }
+
   private Handler<AsyncResult<HttpServer>> startHandler(final CompletableFuture<?> resultFuture) {
     return res -> {
       if (res.succeeded()) {

ethereum/jsonrpc/src/test/java/tech/pegasys/pantheon/ethereum/jsonrpc/websocket/WebSocketServiceTest.java

@@ -25,6 +25,8 @@ import java.util.Map;
 
 import io.vertx.core.Vertx;
 import io.vertx.core.buffer.Buffer;
+import io.vertx.core.http.HttpClient;
+import io.vertx.core.http.HttpClientOptions;
 import io.vertx.core.http.HttpServerOptions;
 import io.vertx.core.http.WebSocketBase;
 import io.vertx.ext.unit.Async;
@@ -44,6 +46,7 @@ public class WebSocketServiceTest {
   private WebSocketConfiguration websocketConfiguration;
   private WebSocketRequestHandler webSocketRequestHandlerSpy;
   private WebSocketService websocketService;
+  private HttpClient httpClient;
 
   @Before
   public void before() {
@@ -61,6 +64,13 @@ public class WebSocketServiceTest {
     websocketService.start().join();
 
     websocketConfiguration.setPort(websocketService.socketAddress().getPort());
+
+    HttpClientOptions httpClientOptions =
+        new HttpClientOptions()
+            .setDefaultHost(websocketConfiguration.getHost())
+            .setDefaultPort(websocketConfiguration.getPort());
+
+    httpClient = vertx.createHttpClient(httpClientOptions);
   }
 
   @After
@@ -76,11 +86,7 @@ public class WebSocketServiceTest {
     final String request = "{\"id\": 1, \"method\": \"eth_subscribe\", \"params\": [\"syncing\"]}";
     final String expectedResponse = "{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":\"0x1\"}";
 
-    vertx
-        .createHttpClient()
-        .websocket(
-            websocketConfiguration.getPort(),
-            websocketConfiguration.getHost(),
+    httpClient.websocket(
         "/",
         webSocket -> {
           webSocket.write(Buffer.buffer(request));
@@ -107,15 +113,7 @@ public class WebSocketServiceTest {
               context.assertNotNull(m.body());
               async.complete();
             })
-        .completionHandler(
-            v ->
-                vertx
-                    .createHttpClient()
-                    .websocket(
-                        websocketConfiguration.getPort(),
-                        websocketConfiguration.getHost(),
-                        "/",
-                        WebSocketBase::close));
+        .completionHandler(v -> httpClient.websocket("/", WebSocketBase::close));
 
     async.awaitSuccess(VERTX_AWAIT_TIMEOUT_MILLIS);
   }
@@ -127,11 +125,7 @@ public class WebSocketServiceTest {
     final byte[] bigMessage = new byte[HttpServerOptions.DEFAULT_MAX_WEBSOCKET_MESSAGE_SIZE + 1];
     Arrays.fill(bigMessage, (byte) 1);
 
-    vertx
-        .createHttpClient()
-        .websocket(
-            websocketConfiguration.getPort(),
-            websocketConfiguration.getHost(),
+    httpClient.websocket(
         "/",
         webSocket -> {
           webSocket.write(Buffer.buffer(bigMessage));
@@ -140,4 +134,27 @@ public class WebSocketServiceTest {
 
     async.awaitSuccess(VERTX_AWAIT_TIMEOUT_MILLIS);
   }
+
+  @Test
+  public void websocketServiceMustReturnErrorOnHttpRequest(final TestContext context) {
+    final Async async = context.async();
+
+    httpClient
+        .post(
+            websocketConfiguration.getPort(),
+            websocketConfiguration.getHost(),
+            "/",
+            response ->
+                response.bodyHandler(
+                    b -> {
+                      context
+                          .assertEquals(400, response.statusCode())
+                          .assertEquals(
+                              "Websocket endpoint can't handle HTTP requests", b.toString());
+                      async.complete();
+                    }))
+        .end();
+
+    async.awaitSuccess(VERTX_AWAIT_TIMEOUT_MILLIS);
+  }
 }