alien11689 commented on code in PR #93: URL: https://github.com/apache/aries-rsa/pull/93#discussion_r3156850603
########## discovery/tcp/src/main/java/org/apache/aries/rsa/discovery/tcp/TcpConnectionManager.java: ########## @@ -0,0 +1,228 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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.apache.aries.rsa.discovery.tcp; + +import org.apache.aries.rsa.discovery.tcp.TcpMessage.*; +import org.osgi.service.remoteserviceadmin.EndpointDescription; +import org.osgi.service.remoteserviceadmin.EndpointEvent; +import org.osgi.service.remoteserviceadmin.EndpointEventListener; +import org.slf4j.Logger; +import org.slf4j.LoggerFactory; + +import java.io.IOException; +import java.net.*; +import java.util.*; +import java.util.concurrent.ConcurrentHashMap; +import java.util.concurrent.ExecutorService; +import java.util.concurrent.Executors; + +import static org.apache.aries.rsa.discovery.tcp.TcpDiscovery.toURI; + +/** + * Manages all TCP connections for this provider, as well as + * the higher-level TCP discovery protocol logic. + * <p> + * This includes accepting incoming connections on a server socket, + * initiating outgoing connections to configured (or discovered) peers, + * connection retry logic after unexpected disconnection, handling + * incoming messages from connections and handling gossip-discovered peers. + * <p> + * In addition to the protocol-level functionality, it keeps track of + * all known local endpoints and notifies all remote peers about them. + */ +public class TcpConnectionManager implements EndpointEventListener { + private static final Logger LOG = LoggerFactory.getLogger(TcpConnectionManager.class); + + private final InterestManager interestManager; + private final String localAddress; + private final String localUuid; + private final long reconnectDelay; + private final boolean gossip; + + private final ExecutorService executor = Executors.newCachedThreadPool(); // for connect/accept threads + private final Set<TcpConnection> connections = ConcurrentHashMap.newKeySet(); // all connections, including before handshake + private final Map<String, TcpConnection> connectionsByUuid = new ConcurrentHashMap<>(); // connections after handshake (known uuid) + private final Map<String, EndpointDescription> localEndpoints = new ConcurrentHashMap<>(); + private final Set<String> peers = ConcurrentHashMap.newKeySet(); // all configured and discovered (gossip) peer addresses + + private ServerSocket serverSocket; + private volatile boolean closing; + + public TcpConnectionManager(InterestManager interestManager, String localAddress, + String localUuid, long reconnectDelay, boolean gossip) { + this.interestManager = interestManager; + this.localAddress = localAddress; + this.localUuid = localUuid; + this.reconnectDelay = reconnectDelay; + this.gossip = gossip; + } + + public void open(String bindAddress, int port, Collection<String> peers) throws IOException { + serverSocket = new ServerSocket(); + serverSocket.setReuseAddress(true); + serverSocket.bind(new InetSocketAddress(bindAddress, port)); + executor.submit(this::acceptLoop); + addPeers(peers); + } + + public void close() throws IOException { + closing = true; + serverSocket.close(); // acceptLoop will get SocketException + connections.forEach(TcpConnection::close); + executor.shutdownNow(); + } + + private void addPeers(Collection<String> peers) { + peers.stream() + .filter(peer -> !this.peers.contains(peer)) // only new ones + .filter(peer -> !localAddress.equals(peer)) // exclude ourself + .forEach(peer -> { + LOG.info("Adding peer {}", peer); + this.peers.add(peer); + executor.submit(() -> connectLoop(peer)); + }); + } + + private void acceptLoop() { + while (true) { + try { + Socket socket = serverSocket.accept(); + executor.submit(() -> onConnected(socket, null)); + } catch (IOException ioe) { + return; // socket closed + } catch (Throwable t) { + LOG.error("Unexpected error in accept loop - shutting down", t); + return; + } + } + } + + private void connectLoop(String address) { + URI uri = toURI(address); + while (!closing) { + try { + Socket socket = new Socket(uri.getHost(), uri.getPort()); + onConnected(socket, address); + return; // connection established; onConnectionClosed will restart this loop if needed + } catch (IOException ioe) { + try { + Thread.sleep(reconnectDelay); + } catch (InterruptedException ie) { + // end loop (shutting down) + return; + } + } catch (Throwable t) { + LOG.error("Unexpected error in connect loop - shutting down", t); + return; + } + } + } + + private void onConnected(Socket socket, String address) { + try { + TcpConnection conn = new TcpConnection(socket, address, this::onMessage, this::onClosed); + connections.add(conn); + conn.send(new HandshakeMessage(localUuid, localAddress, new ArrayList<>(peers))); + // don't send known endpoints yet, only after receiving handshake + } catch (IOException ioe) { + LOG.error("error initializing accepted connection", ioe); Review Comment: Honestly I don't know what exactly do with the error - we have `execuctor.submit` from which we could later monitor `Future`, but how to react to error then... 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