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/*
* Copyright (c) 2015 Uber Technologies, Inc.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package com.uber.tchannel.channels;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelId;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.net.SocketAddress;
import java.util.HashMap;
import java.util.concurrent.ConcurrentHashMap;
import java.util.Map;
/**
* PeerManager manages peers, a abstract presentation of a channel to a host_port.
*/
public class PeerManager {
private static final Logger logger = LoggerFactory.getLogger(PeerManager.class);
private final Bootstrap clientBootstrap;
private final ConcurrentHashMap peers = new ConcurrentHashMap<>();
// mapping from channel to actual remote address when client is not ephemeral
private final ConcurrentHashMap channelTable = new ConcurrentHashMap<>();
private final ConcurrentHashMap inConnections = new ConcurrentHashMap<>();
private String hostPort = "0.0.0.0:0";
public PeerManager(Bootstrap clientBootstrap) {
this.clientBootstrap = clientBootstrap;
}
public Connection findOrNew(SocketAddress address) {
Peer peer = peers.get(address);
if (peer == null) {
peer = new Peer(this, address);
peers.putIfAbsent(address, peer);
peer = peers.get(address);
}
return peer.connect(this.clientBootstrap);
}
public Peer findOrNewPeer(SocketAddress address) {
Peer peer = peers.get(address);
if (peer == null) {
peer = new Peer(this, address);
peers.putIfAbsent(address, peer);
peer = peers.get(address);
}
return peer;
}
public Peer getPeer(SocketAddress address) {
return peers.get(address);
}
public Peer getPeer(Channel channel) {
SocketAddress address = channel.remoteAddress();
return peers.get(address);
}
public Connection connectTo(SocketAddress address) {
Peer peer = findOrNewPeer(address);
return peer.connect(this.clientBootstrap, Connection.Direction.OUT);
}
public Connection get(Channel channel) {
SocketAddress address = channel.remoteAddress();
Peer peer = peers.get(address);
if (peer != null) {
return peer.getConnection(channel.id());
}
return null;
}
public void add(ChannelHandlerContext ctx) {
// Direction only matters for the init path when the
// init handler hasn't been removed
Connection.Direction direction = Connection.Direction.OUT;
if (ctx.pipeline().names().contains("InitRequestHandler")) {
direction = Connection.Direction.IN;
}
if (direction == Connection.Direction.IN) {
return;
}
Channel channel = ctx.channel();
SocketAddress address = channel.remoteAddress();
Peer peer = findOrNewPeer(address);
peer.handleActiveOutConnection(ctx);
}
public Connection remove(Channel channel) {
SocketAddress address = channel.remoteAddress();
Peer peer = peers.get(address);
if (peer != null) {
return peer.remove(channel);
}
address = channelTable.remove(channel.id());
if (address == null) {
return null;
}
peer = peers.get(address);
if (peer != null) {
return peer.remove(channel);
}
// TODO: clean up when conneciton count drops to 0
return null;
}
public void setIdentified(Channel channel, Map headers) {
Connection conn = get(channel);
if (conn == null) {
// Handle in connection
conn = new Connection(null, channel, Connection.Direction.IN);
}
conn.setIndentified(headers);
if (!conn.isEphemeral() && conn.direction == Connection.Direction.IN) {
SocketAddress address = conn.getRemoteAddressAsSocketAddress();
channelTable.put(channel.id(), address);
Peer peer = findOrNewPeer(address);
conn.setPeer(peer);
peer.add(conn);
}
}
public void handleConnectionErrors(Channel channel, Throwable cause) {
logger.error("Resetting connection due to the error.", cause);
Connection conn = remove(channel);
if (conn != null) {
conn.clean();
}
}
public void close() {
for (SocketAddress addr : peers.keySet()) {
peers.get(addr).close();
}
peers.clear();
}
public void setHostPort(String hostPort) {
this.hostPort = hostPort;
}
public String getHostPort() {
return hostPort;
}
// TODO: peer stats & reaper
public Map getStats() {
int in = 0;
int out = 0;
for (SocketAddress addr : peers.keySet()) {
Map connStats = peers.get(addr).getStats();
in += connStats.get("connections.in");
out += connStats.get("connections.out");
}
Map result = new HashMap<>();
result.put("connections.in", in);
result.put("connections.out", out);
return result;
}
}
