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JettyWebSocketBuilder.java
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JettyWebSocketBuilder.java
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/**
* Copyright (C) 2015 Red Hat, Inc.
*
* Licensed 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.
*/
package io.fabric8.kubernetes.client.jetty;
import io.fabric8.kubernetes.client.KubernetesClientException;
import io.fabric8.kubernetes.client.http.AbstractBasicBuilder;
import io.fabric8.kubernetes.client.http.Interceptor;
import io.fabric8.kubernetes.client.http.StandardHttpHeaders;
import io.fabric8.kubernetes.client.http.StandardHttpRequest;
import io.fabric8.kubernetes.client.http.WebSocket;
import io.fabric8.kubernetes.client.http.WebSocketHandshakeException;
import io.fabric8.kubernetes.client.utils.Utils;
import org.eclipse.jetty.client.HttpResponse;
import org.eclipse.jetty.websocket.api.exceptions.UpgradeException;
import org.eclipse.jetty.websocket.client.ClientUpgradeRequest;
import org.eclipse.jetty.websocket.client.WebSocketClient;
import java.time.Duration;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Objects;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.TimeUnit;
public class JettyWebSocketBuilder extends AbstractBasicBuilder<JettyWebSocketBuilder> implements WebSocket.Builder {
private final WebSocketClient webSocketClient;
private final Duration handshakeTimeout;
private final Collection<Interceptor> interceptors;
private String subprotocol;
public JettyWebSocketBuilder(
WebSocketClient webSocketClient, Duration handshakeTimeout, Collection<Interceptor> interceptors) {
this.webSocketClient = webSocketClient;
this.handshakeTimeout = handshakeTimeout;
this.interceptors = interceptors;
}
@Override
public CompletableFuture<WebSocket> buildAsync(WebSocket.Listener listener) {
try {
webSocketClient.start();
final var requestBuilder = copy(this);
interceptors.forEach(i -> i.before(requestBuilder, new StandardHttpHeaders(requestBuilder.getHeaders())));
final ClientUpgradeRequest cur = new ClientUpgradeRequest();
if (Utils.isNotNullOrEmpty(requestBuilder.subprotocol)) {
cur.setSubProtocols(requestBuilder.subprotocol);
}
cur.setHeaders(requestBuilder.getHeaders());
cur.setTimeout(requestBuilder.handshakeTimeout.toMillis(), TimeUnit.MILLISECONDS);
// Extra-future required because we can't Map the UpgradeException to a WebSocketHandshakeException easily
final CompletableFuture<WebSocket> future = new CompletableFuture<>();
final var webSocket = new JettyWebSocket(listener);
return webSocketClient.connect(webSocket, Objects.requireNonNull(WebSocket.toWebSocketUri(requestBuilder.getUri())), cur)
.thenApply(s -> webSocket)
.exceptionally(ex -> {
if (ex instanceof CompletionException && ex.getCause() instanceof UpgradeException) {
future.completeExceptionally(toHandshakeException((UpgradeException) ex.getCause()));
} else if (ex instanceof UpgradeException) {
future.completeExceptionally(toHandshakeException((UpgradeException) ex));
} else {
future.completeExceptionally(ex);
}
return null;
})
.thenCompose(ws -> {
future.complete(ws);
return future;
});
} catch (Exception e) {
throw KubernetesClientException.launderThrowable(e);
}
}
@Override
public JettyWebSocketBuilder subprotocol(String protocol) {
this.subprotocol = protocol;
return this;
}
private static WebSocketHandshakeException toHandshakeException(UpgradeException ex) {
return new WebSocketHandshakeException(new JettyHttpResponse<>(
new StandardHttpRequest.Builder().uri(ex.getRequestURI()).build(),
new HttpResponse(null, Collections.emptyList()).status(ex.getResponseStatusCode()),
null))
.initCause(ex);
}
private static JettyWebSocketBuilder copy(JettyWebSocketBuilder original) {
final var copy = new JettyWebSocketBuilder(
original.webSocketClient, original.handshakeTimeout, new ArrayList<>(original.interceptors));
copy.uri(original.getUri());
original.getHeaders().forEach((h, values) -> values.forEach(v -> copy.header(h, v)));
copy.subprotocol(original.subprotocol);
return copy;
}
}