/*
* Copyright 2017 the original author or authors.
*
* 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 org.gradle.test.fixtures.server.http;
import com.sun.net.httpserver.HttpExchange;
import com.sun.net.httpserver.HttpHandler;
import org.gradle.api.Nullable;
import org.gradle.internal.UncheckedException;
import org.gradle.internal.exceptions.DefaultMultiCauseException;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
class ChainingHttpHandler implements HttpHandler {
private final AtomicInteger counter;
private final List<TrackingHttpHandler> handlers = new CopyOnWriteArrayList<TrackingHttpHandler>();
private final List<Throwable> failures = new CopyOnWriteArrayList<Throwable>();
private boolean completed;
private final Lock lock;
private final Condition condition;
private int requestCount;
ChainingHttpHandler(Lock lock, AtomicInteger counter) {
this.lock = lock;
this.condition = lock.newCondition();
this.counter = counter;
}
public void addHandler(TrackingHttpHandler handler) {
handlers.add(handler);
}
public void assertComplete() {
lock.lock();
try {
if (!completed) {
for (TrackingHttpHandler handler : handlers) {
try {
handler.assertComplete();
} catch (Throwable t) {
failures.add(t);
}
}
completed = true;
}
if (!failures.isEmpty()) {
throw new DefaultMultiCauseException("Failed to handle all HTTP requests.", failures);
}
} finally {
lock.unlock();
}
}
@Override
public void handle(HttpExchange httpExchange) throws IOException {
int id = counter.incrementAndGet();
System.out.println(String.format("[%d] handling %s %s", id, httpExchange.getRequestMethod(), httpExchange.getRequestURI().getPath()));
ResourceHandler resourceHandler = selectHandler(id, httpExchange);
if (resourceHandler != null) {
System.out.println(String.format("[%d] sending response", id));
resourceHandler.writeTo(httpExchange);
} else {
System.out.println(String.format("[%d] sending error response", id));
if (httpExchange.getRequestMethod().equals("HEAD")) {
httpExchange.sendResponseHeaders(500, -1);
} else {
byte[] message = String.format("Failed %s request to %s", httpExchange.getRequestMethod(), httpExchange.getRequestURI().getPath()).getBytes();
httpExchange.sendResponseHeaders(500, message.length);
httpExchange.getResponseBody().write(message);
}
}
httpExchange.close();
}
/**
* Returns null on failure.
*/
@Nullable
private ResourceHandler selectHandler(int id, HttpExchange httpExchange) {
lock.lock();
try {
requestCount++;
condition.signalAll();
if (completed) {
System.out.println(String.format("[%d] received request %s %s after HTTP server has stopped.", id, httpExchange.getRequestMethod(), httpExchange.getRequestURI()));
return null;
}
if (httpExchange.getRequestMethod().equals("GET")) {
for (TrackingHttpHandler handler : handlers) {
ResourceHandler resourceHandler = handler.handle(id, httpExchange);
if (resourceHandler != null) {
return resourceHandler;
}
}
}
System.out.println(String.format("[%d] unexpected request %s %s", id, httpExchange.getRequestMethod(), httpExchange.getRequestURI()));
failures.add(new AssertionError(String.format("Received unexpected request %s %s", httpExchange.getRequestMethod(), httpExchange.getRequestURI().getPath())));
} catch (Throwable t) {
System.out.println(String.format("[%d] error during handling of request %s %s", id, httpExchange.getRequestMethod(), httpExchange.getRequestURI()));
failures.add(new AssertionError(String.format("Failed to handle %s %s", httpExchange.getRequestMethod(), httpExchange.getRequestURI().getPath()), t));
} finally {
lock.unlock();
}
return null;
}
void waitForRequests(int requestCount) {
lock.lock();
try {
while (this.requestCount < requestCount) {
try {
condition.await();
} catch (InterruptedException e) {
throw UncheckedException.throwAsUncheckedException(e);
}
}
} finally {
lock.unlock();
}
}
}