/* * 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 com.google.common.collect.Maps; import io.netty.bootstrap.Bootstrap; import io.netty.channel.Channel; import io.netty.channel.ChannelHandlerContext; import io.netty.channel.ChannelId; import org.jetbrains.annotations.NotNull; import org.jetbrains.annotations.Nullable; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import java.net.SocketAddress; import java.util.Map; import java.util.concurrent.ConcurrentHashMap; /** * 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 @NotNull ConcurrentHashMap<SocketAddress, Peer> peers = new ConcurrentHashMap<>(); // mapping from channel to actual remote address when client is not ephemeral private final ConcurrentHashMap<ChannelId, SocketAddress> channelTable = new ConcurrentHashMap<>(); private final ConcurrentHashMap<ChannelId, Connection> inConnections = new ConcurrentHashMap<>(); private String hostPort = "0.0.0.0:0"; public PeerManager(Bootstrap clientBootstrap) { this.clientBootstrap = clientBootstrap; } public Connection findOrNew(@NotNull SocketAddress address) { return findOrNewPeer(address).connect(this.clientBootstrap); } public Peer findOrNewPeer(@NotNull SocketAddress address) { Peer peer = peers.get(address); if (peer == null) { peers.putIfAbsent(address, new Peer(this, address)); peer = peers.get(address); } return peer; } public @Nullable Peer getPeer(@NotNull SocketAddress address) { return peers.get(address); } public @Nullable Peer getPeer(@NotNull Channel channel) { return peers.get(channel.remoteAddress()); } public Connection connectTo(@NotNull SocketAddress address) { return findOrNewPeer(address).connect(this.clientBootstrap, Connection.Direction.OUT); } public @Nullable Connection get(@NotNull Channel channel) { Peer peer = peers.get(channel.remoteAddress()); return peer == null ? null : peer.getConnection(channel.id()); } public void add(@NotNull ChannelHandlerContext ctx) { // Direction only matters for the init path when the init handler hasn't been removed if (!ctx.pipeline().names().contains("InitRequestHandler")) { findOrNewPeer(ctx.channel().remoteAddress()).handleActiveOutConnection(ctx); } } public @Nullable Connection remove(@NotNull Channel channel) { Peer peer = peers.get(channel.remoteAddress()); if (peer != null) { return peer.remove(channel); } SocketAddress address = channelTable.remove(channel.id()); if (address != null) { peer = peers.get(address); if (peer != null) { return peer.remove(channel); } } // TODO: clean up when connection count drops to 0 return null; } public void setIdentified(@NotNull Channel channel, @NotNull Map<String, String> headers) { Connection conn = get(channel); if (conn == null) { // Handle in connection conn = new Connection(null, channel, Connection.Direction.IN); } conn.setIdentified(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(@NotNull Channel channel, @NotNull Throwable cause) { logger.error("Resetting connection due to the error.", cause); Connection conn = remove(channel); if (conn != null) { conn.clean(); } } public void close() { for (Peer peer : peers.values()) { peer.close(); } peers.clear(); } public void setHostPort(String hostPort) { this.hostPort = hostPort; } public String getHostPort() { return hostPort; } // TODO: peer stats & reaper public @NotNull Map<String, Integer> getStats() { int in = 0; int out = 0; for (Peer peer : peers.values()) { Map<String, Integer> connStats = peer.getStats(); in += connStats.get("connections.in"); out += connStats.get("connections.out"); } Map<String, Integer> result = Maps.newHashMapWithExpectedSize(2); result.put("connections.in", in); result.put("connections.out", out); return result; } }