com.vmware.xenon.common.http.netty.NettyHttp2UserEventLogger Maven / Gradle / Ivy
/*
* Copyright (c) 2014-2015 VMware, Inc. All Rights Reserved.
*
* 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 com.vmware.xenon.common.http.netty;
import java.util.logging.Level;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelInboundHandlerAdapter;
import io.netty.handler.codec.http.HttpClientUpgradeHandler;
import com.vmware.xenon.common.Utils;
/**
* This is a handler that is inserted into a Netty channel pipeline just to log
* user events related to upgrades from HTTP/1.1 to HTTP/2. We only log failed
* attempts (that's interesting) unless debugLogging is enabled, in which case
* we log all events.
*/
public class NettyHttp2UserEventLogger extends ChannelInboundHandlerAdapter {
private boolean debugLogging = false;
public NettyHttp2UserEventLogger(boolean debugLogging) {
this.debugLogging = debugLogging;
}
@Override
public void userEventTriggered(ChannelHandlerContext context, Object eventRaw)
throws Exception {
if (!(eventRaw instanceof HttpClientUpgradeHandler.UpgradeEvent)) {
super.userEventTriggered(context, eventRaw);
return;
}
HttpClientUpgradeHandler.UpgradeEvent event = (HttpClientUpgradeHandler.UpgradeEvent) eventRaw;
if (event == HttpClientUpgradeHandler.UpgradeEvent.UPGRADE_REJECTED) {
Utils.log(NettyHttpClientRequestInitializer.class,
NettyHttpClientRequestInitializer.class.getSimpleName(),
Level.WARNING, "Failed to upgrade to HTTP/2: throughput will be slow");
} else if (this.debugLogging) {
Utils.log(NettyHttpClientRequestInitializer.class,
NettyHttpClientRequestInitializer.class.getSimpleName(),
Level.INFO, "HTTP/2 channel pipeline user event: %s", event);
}
super.userEventTriggered(context, eventRaw);
}
}