io.fabric8.kubernetes.client.jdkhttp.JdkHttpClientImpl Maven / Gradle / Ivy
/**
* 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.jdkhttp;
import io.fabric8.kubernetes.client.http.HttpClient;
import io.fabric8.kubernetes.client.http.HttpRequest;
import io.fabric8.kubernetes.client.http.HttpResponse;
import io.fabric8.kubernetes.client.http.Interceptor;
import io.fabric8.kubernetes.client.http.WebSocket;
import io.fabric8.kubernetes.client.http.WebSocket.Listener;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URI;
import java.net.http.HttpResponse.BodyHandler;
import java.net.http.HttpResponse.BodyHandlers;
import java.net.http.HttpResponse.BodySubscriber;
import java.net.http.HttpResponse.BodySubscribers;
import java.net.http.WebSocketHandshakeException;
import java.nio.ByteBuffer;
import java.nio.charset.StandardCharsets;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.concurrent.CompletableFuture;
import java.util.concurrent.CompletionException;
import java.util.concurrent.Flow;
import java.util.concurrent.Flow.Subscriber;
import java.util.concurrent.Flow.Subscription;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.concurrent.atomic.AtomicLong;
import java.util.function.Supplier;
/**
* TODO:
* - Mapping to a Reader is always UTF-8
* - determine if write timeout should be implemented
*/
public class JdkHttpClientImpl implements HttpClient {
private final class AsyncBodySubscriber implements Subscriber, AsyncBody {
private final BodyConsumer consumer;
private CompletableFuture done = new CompletableFuture();
private final AtomicBoolean subscribed = new AtomicBoolean();
private volatile Flow.Subscription subscription;
private T initialItem;
private boolean first = true;
private boolean isComplete;
private AsyncBodySubscriber(BodyConsumer consumer) {
this.consumer = consumer;
}
@Override
public void onSubscribe(Subscription subscription) {
if (!subscribed.compareAndSet(false, true)) {
subscription.cancel();
return;
}
this.subscription = subscription;
// the sendAsync future won't complete unless we do the initial request here
// so in onNext we'll trap the item until we're ready
subscription.request(1);
}
@Override
public void onNext(T item) {
synchronized (this) {
if (first) {
this.initialItem = item;
first = false;
return;
}
}
try {
if (item == null) {
done.complete(null);
} else {
consumer.consume(item, this);
}
} catch (Exception e) {
subscription.cancel();
done.completeExceptionally(e);
}
}
@Override
public void onError(Throwable throwable) {
done.completeExceptionally(throwable);
}
@Override
public synchronized void onComplete() {
if (initialItem != null) {
this.isComplete = true;
return;
}
done.complete(null);
}
@Override
public synchronized void consume() {
if (done.isDone()) {
return;
}
try {
first = false;
if (initialItem != null) {
T item = initialItem;
initialItem = null;
onNext(item);
}
} finally {
if (isComplete) {
done.complete(null);
}
this.subscription.request(1);
}
}
@Override
public CompletableFuture done() {
return done;
}
@Override
public void cancel() {
subscription.cancel();
done.cancel(false);
}
}
private static class JdkHttpResponseImpl implements HttpResponse {
private java.net.http.HttpResponse response;
private T body;
public JdkHttpResponseImpl(java.net.http.HttpResponse response) {
this(response, response.body());
}
public JdkHttpResponseImpl(java.net.http.HttpResponse response, T body) {
this.response = response;
this.body = body;
}
@Override
public List headers(String key) {
return response.headers().allValues(key);
}
@Override
public Map> headers() {
return response.headers().map();
}
@Override
public int code() {
return response.statusCode();
}
@Override
public T body() {
return body;
}
@Override
public HttpRequest request() {
return new JdkHttpRequestImpl(null, response.request());
}
@Override
public Optional> previousResponse() {
return response.previousResponse().map(JdkHttpResponseImpl::new);
}
}
static class AsyncResponse {
java.net.http.HttpResponse response;
AsyncBody asyncBody;
public AsyncResponse(java.net.http.HttpResponse response, AsyncBody asyncBody) {
this.response = response;
this.asyncBody = asyncBody;
}
}
static class HandlerAndAsyncBody {
BodyHandler handler;
AsyncBody asyncBody;
public HandlerAndAsyncBody(BodyHandler handler, AsyncBody asyncBody) {
this.handler = handler;
this.asyncBody = asyncBody;
}
}
private JdkHttpClientBuilderImpl builder;
private java.net.http.HttpClient httpClient;
public JdkHttpClientImpl(JdkHttpClientBuilderImpl builderImpl, java.net.http.HttpClient httpClient) {
this.builder = builderImpl;
this.httpClient = httpClient;
}
@Override
public void close() {
if (this.httpClient == null) {
return;
}
builder.clientFactory.closeHttpClient(this);
// help with default cleanup, which is based upon garbarge collection
this.httpClient = null;
}
@Override
public DerivedClientBuilder newBuilder() {
return this.builder.copy(getHttpClient());
}
@Override
public CompletableFuture> consumeLines(HttpRequest request, BodyConsumer consumer) {
return sendAsync(request, () -> {
AsyncBodySubscriber subscriber = new AsyncBodySubscriber<>(consumer);
BodyHandler handler = BodyHandlers.fromLineSubscriber(subscriber);
return new HandlerAndAsyncBody<>(handler, subscriber);
}).thenApply(r -> new JdkHttpResponseImpl(r.response, r.asyncBody));
}
@Override
public CompletableFuture> consumeBytes(HttpRequest request, BodyConsumer> consumer) {
return sendAsync(request, () -> {
AsyncBodySubscriber> subscriber = new AsyncBodySubscriber<>(consumer);
BodyHandler handler = BodyHandlers.fromSubscriber(subscriber);
return new HandlerAndAsyncBody<>(handler, subscriber);
}).thenApply(r -> new JdkHttpResponseImpl(r.response, r.asyncBody));
}
@Override
public CompletableFuture> sendAsync(HttpRequest request, Class type) {
return sendAsync(request, () -> new HandlerAndAsyncBody(toBodyHandler(type), null))
.thenApply(ar -> new JdkHttpResponseImpl<>(ar.response));
}
private BodyHandler toBodyHandler(Class type) {
BodyHandler bodyHandler;
if (type == null) {
bodyHandler = (BodyHandler) BodyHandlers.discarding();
} else if (type == InputStream.class) {
bodyHandler = (BodyHandler) BodyHandlers.ofInputStream();
} else if (type == String.class) {
bodyHandler = (BodyHandler) BodyHandlers.ofString();
} else if (type == byte[].class) {
bodyHandler = (BodyHandler) BodyHandlers.ofByteArray();
} else {
bodyHandler = responseInfo -> {
BodySubscriber upstream = BodyHandlers.ofInputStream().apply(responseInfo);
BodySubscriber downstream = BodySubscribers.mapping(
upstream,
(InputStream is) -> new InputStreamReader(is, StandardCharsets.UTF_8));
return (BodySubscriber) downstream;
};
}
return bodyHandler;
}
public CompletableFuture> sendAsync(HttpRequest request,
Supplier> handlerAndAsyncBodySupplier) {
JdkHttpRequestImpl jdkRequest = (JdkHttpRequestImpl) request;
JdkHttpRequestImpl.BuilderImpl builderImpl = jdkRequest.newBuilder();
for (Interceptor interceptor : builder.interceptors.values()) {
interceptor.before(builderImpl, jdkRequest);
jdkRequest = builderImpl.build();
}
HandlerAndAsyncBody handlerAndAsyncBody = handlerAndAsyncBodySupplier.get();
CompletableFuture> cf = this.getHttpClient().sendAsync(builderImpl.build().request,
handlerAndAsyncBody.handler).thenApply(r -> new AsyncResponse<>(r, handlerAndAsyncBody.asyncBody));
for (Interceptor interceptor : builder.interceptors.values()) {
cf = cf.thenCompose(ar -> {
java.net.http.HttpResponse response = ar.response;
if (response != null && !HttpResponse.isSuccessful(response.statusCode())) {
return interceptor.afterFailure(builderImpl, new JdkHttpResponseImpl<>(response)).thenCompose(b -> {
if (b) {
HandlerAndAsyncBody interceptedHandlerAndAsyncBody = handlerAndAsyncBodySupplier.get();
return this.getHttpClient().sendAsync(builderImpl.build().request, interceptedHandlerAndAsyncBody.handler)
.thenApply(r -> new AsyncResponse<>(r, interceptedHandlerAndAsyncBody.asyncBody));
}
return CompletableFuture.completedFuture(ar);
});
}
return CompletableFuture.completedFuture(ar);
});
}
return cf;
}
@Override
public io.fabric8.kubernetes.client.http.WebSocket.Builder newWebSocketBuilder() {
return new JdkWebSocketImpl.BuilderImpl(this);
}
@Override
public io.fabric8.kubernetes.client.http.HttpRequest.Builder newHttpRequestBuilder() {
return new JdkHttpRequestImpl.BuilderImpl().timeout(this.builder.readTimeout);
}
/*
* TODO: this may not be the best way to do this - in general
* instead we create a reponse to hold them both
*/
private static class WebSocketResponse {
public WebSocketResponse(WebSocket w, java.net.http.WebSocketHandshakeException wshse) {
this.webSocket = w;
this.wshse = wshse;
}
WebSocket webSocket;
java.net.http.WebSocketHandshakeException wshse;
}
public CompletableFuture buildAsync(JdkWebSocketImpl.BuilderImpl webSocketBuilder, Listener listener) {
JdkWebSocketImpl.BuilderImpl copy = webSocketBuilder.copy();
for (Interceptor interceptor : builder.interceptors.values()) {
interceptor.before(copy, new JdkHttpRequestImpl(null, copy.asRequest()));
}
CompletableFuture result = new CompletableFuture<>();
CompletableFuture cf = internalBuildAsync(copy, listener);
for (Interceptor interceptor : builder.interceptors.values()) {
cf = cf.thenCompose(response -> {
if (response.wshse != null && response.wshse.getResponse() != null) {
return interceptor.afterFailure(copy, new JdkHttpResponseImpl<>(response.wshse.getResponse())).thenCompose(b -> {
if (b) {
return this.internalBuildAsync(copy, listener);
}
return CompletableFuture.completedFuture(response);
});
}
return CompletableFuture.completedFuture(response);
});
}
// map back to the expected convention with the future completed by the response exception
cf.whenComplete((r, t) -> {
if (t != null) {
result.completeExceptionally(t);
} else if (r != null) {
if (r.wshse != null) {
result.completeExceptionally(new io.fabric8.kubernetes.client.http.WebSocketHandshakeException(
new JdkHttpResponseImpl<>(r.wshse.getResponse())).initCause(r.wshse));
} else {
result.complete(r.webSocket);
}
} else {
// shouldn't happen
result.complete(null);
}
});
return result;
}
/**
* Convert the invocation of a JDK build async into a holder of both the exception and the response
*/
public CompletableFuture internalBuildAsync(JdkWebSocketImpl.BuilderImpl webSocketBuilder,
Listener listener) {
java.net.http.HttpRequest request = webSocketBuilder.asRequest();
java.net.http.WebSocket.Builder newBuilder = this.getHttpClient().newWebSocketBuilder();
request.headers().map().forEach((k, v) -> v.forEach(s -> newBuilder.header(k, s)));
if (webSocketBuilder.subprotocol != null) {
newBuilder.subprotocols(webSocketBuilder.subprotocol);
}
// the Watch logic sets a websocketTimeout as the readTimeout
// TODO: this should probably be made clearer in the docs
if (this.builder.readTimeout != null) {
newBuilder.connectTimeout(this.builder.readTimeout);
}
AtomicLong queueSize = new AtomicLong();
// use a responseholder to convey both the exception and the websocket
CompletableFuture response = new CompletableFuture<>();
URI uri = WebSocket.toWebSocketUri(request.uri());
newBuilder.buildAsync(uri, new JdkWebSocketImpl.ListenerAdapter(listener, queueSize)).whenComplete((w, t) -> {
if (t instanceof CompletionException && t.getCause() != null) {
t = t.getCause();
}
if (t instanceof java.net.http.WebSocketHandshakeException) {
response.complete(new WebSocketResponse(new JdkWebSocketImpl(queueSize, w), (WebSocketHandshakeException) t));
} else if (t != null) {
response.completeExceptionally(t);
} else {
response.complete(new WebSocketResponse(new JdkWebSocketImpl(queueSize, w), null));
}
});
return response;
}
public JdkHttpClientBuilderImpl getBuilder() {
return builder;
}
java.net.http.HttpClient getHttpClient() {
if (httpClient == null) {
throw new IllegalStateException("Client already closed");
}
return httpClient;
}
@Override
public Factory getFactory() {
return builder.clientFactory;
}
}
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