/*
* Copyright 2015 Netflix, 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.reactivex.netty.protocol.http.server;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.handler.codec.http.HttpMessage;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.LastHttpContent;
import io.reactivex.netty.channel.ChannelOperations;
import io.reactivex.netty.events.Clock;
import io.reactivex.netty.protocol.http.internal.AbstractHttpConnectionBridge;
import io.reactivex.netty.protocol.http.internal.HttpContentSubscriberEvent;
import io.reactivex.netty.protocol.http.server.events.HttpServerEventPublisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rx.functions.Action0;
import rx.subscriptions.Subscriptions;
import java.util.ArrayDeque;
import java.util.Queue;
import static java.util.concurrent.TimeUnit.*;
public class HttpServerToConnectionBridge<C> extends AbstractHttpConnectionBridge<C> {
private static final Logger logger = LoggerFactory.getLogger(HttpServerToConnectionBridge.class);
private volatile boolean activeContentSubscriberExists;
private final Object contentSubGuard = new Object();
private Queue<HttpContentSubscriberEvent<?>> pendingContentSubs; /*Guarded by contentSubGuard*/
private final HttpServerEventPublisher eventPublisher;
private int lastSeenResponseCode;
public HttpServerToConnectionBridge(HttpServerEventPublisher eventPublisher) {
this.eventPublisher = eventPublisher;
}
@Override
protected void beforeOutboundHeaderWrite(HttpMessage httpMsg, ChannelPromise promise, final long startTimeNanos) {
HttpResponse response = (HttpResponse) httpMsg;
if (eventPublisher.publishingEnabled()) {
eventPublisher.onResponseWriteStart();
}
lastSeenResponseCode = response.status().code();
}
@Override
protected void onOutboundLastContentWrite(LastHttpContent msg, ChannelPromise promise,
final long headerWriteStartTimeNanos) {
final int _responseCode = lastSeenResponseCode;
if (eventPublisher.publishingEnabled()) {
promise.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (eventPublisher.publishingEnabled()) {
long endNanos = Clock.onEndNanos(headerWriteStartTimeNanos);
if (future.isSuccess()) {
eventPublisher.onResponseWriteSuccess(endNanos, NANOSECONDS, _responseCode);
} else {
eventPublisher.onResponseWriteFailed(endNanos, NANOSECONDS, future.cause());
}
}
}
});
}
}
@Override
public void userEventTriggered(final ChannelHandlerContext ctx, Object evt) throws Exception {
if (evt instanceof HttpContentSubscriberEvent) {
final HttpContentSubscriberEvent<?> subscriberEvent = (HttpContentSubscriberEvent<?>) evt;
subscriberEvent.getSubscriber().add(Subscriptions.create(new Action0() {
@Override
public void call() {
HttpContentSubscriberEvent<?> nextSub = null;
synchronized (contentSubGuard) {
if (null != pendingContentSubs) {
nextSub = pendingContentSubs.poll();
}
}
activeContentSubscriberExists = null != nextSub;
if (null != nextSub) {
fireContentSubscriberEvent(ctx, nextSub);
}
}
}));
if (activeContentSubscriberExists) {
synchronized (contentSubGuard) {
if (null == pendingContentSubs) {
pendingContentSubs = new ArrayDeque<>(); /*Guarded by contentSubGuard*/
}
pendingContentSubs.add(subscriberEvent);
}
return;
}
activeContentSubscriberExists = true;
}
// TODO: Handle trailers
super.userEventTriggered(ctx, evt);
}
@Override
protected boolean isInboundHeader(Object nextItem) {
return nextItem instanceof HttpRequest;
}
@Override
protected boolean isOutboundHeader(Object nextItem) {
return nextItem instanceof HttpResponse;
}
@Override
protected Object newHttpObject(Object nextItem, Channel channel) {
if (eventPublisher.publishingEnabled()) {
eventPublisher.onRequestHeadersReceived();
}
return new HttpServerRequestImpl<>((HttpRequest) nextItem, channel);
}
@Override
protected void onContentReceived() {
if (eventPublisher.publishingEnabled()) {
eventPublisher.onRequestContentReceived();
}
}
@Override
protected void onContentReceiveComplete(long receiveStartTimeNanos) {
if (eventPublisher.publishingEnabled()) {
eventPublisher.onRequestReceiveComplete(Clock.onEndNanos(receiveStartTimeNanos), NANOSECONDS);
}
}
@Override
public void channelReadComplete(ChannelHandlerContext ctx) throws Exception {
super.channelReadComplete(ctx);
Boolean shouldFlush = ctx.channel().attr(ChannelOperations.FLUSH_ONLY_ON_READ_COMPLETE).get();
if (null != shouldFlush && shouldFlush) {
ctx.flush(); /*This is a no-op if there is nothing to flush but supports HttpServerResponse.flushOnlyOnReadComplete()*/
}
}
private void fireContentSubscriberEvent(ChannelHandlerContext ctx, HttpContentSubscriberEvent<?> event) {
try {
super.userEventTriggered(ctx, event);
} catch (Exception e) {
try {
exceptionCaught(ctx, e);
} catch (Exception e1) {
logger.error("Exception while handling error in handler.", e1);
}
}
}
}