/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE
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* or https://OpenDS.dev.java.net/OpenDS.LICENSE.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at
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* trunk/opends/resource/legal-notices/OpenDS.LICENSE. If applicable,
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* add the following below this CDDL HEADER, with the fields enclosed
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* by brackets "[]" replaced with your own identifying information:
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* Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*
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*
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* Copyright 2006-2009 Sun Microsystems, Inc.
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*/
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package org.opends.server.replication.server;
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import static org.opends.messages.ReplicationMessages.*;
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import static org.opends.server.loggers.ErrorLogger.logError;
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import static org.opends.server.loggers.debug.DebugLogger.debugEnabled;
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import static org.opends.server.util.StaticUtils.stackTraceToSingleLineString;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.List;
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import java.util.Map;
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import java.util.Set;
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import java.util.concurrent.ConcurrentHashMap;
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import org.opends.messages.Message;
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import org.opends.server.replication.common.DSInfo;
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import org.opends.server.replication.common.RSInfo;
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import org.opends.server.replication.common.ServerState;
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import org.opends.server.replication.common.ServerStatus;
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import org.opends.server.replication.protocol.ProtocolSession;
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import org.opends.server.replication.protocol.ProtocolVersion;
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import org.opends.server.replication.protocol.ReplServerStartMsg;
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import org.opends.server.replication.protocol.ReplicationMsg;
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import org.opends.server.replication.protocol.TopologyMsg;
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import org.opends.server.types.Attribute;
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import org.opends.server.types.AttributeBuilder;
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import org.opends.server.types.Attributes;
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import org.opends.server.types.DirectoryException;
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import org.opends.server.types.ResultCode;
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/**
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* This class defines a server handler, which handles all interaction with a
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* peer replication server.
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*/
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public class ReplicationServerHandler extends ServerHandler
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{
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/*
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* Properties filled only if remote server is a RS
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*/
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private String serverAddressURL;
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/**
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* this collection will contain as many elements as there are
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* LDAP servers connected to the remote replication server.
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*/
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private final Map<Short, LightweightServerHandler> remoteDirectoryServers =
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new ConcurrentHashMap<Short, LightweightServerHandler>();
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/**
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* Starts this handler based on a start message received from remote server.
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* @param inReplServerStartMsg The start msg provided by the remote server.
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* @return Whether the remote server requires encryption or not.
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* @throws DirectoryException When a problem occurs.
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*/
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public boolean processStartFromRemote(ReplServerStartMsg inReplServerStartMsg)
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throws DirectoryException
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{
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try
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{
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protocolVersion = ProtocolVersion.minWithCurrent(
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inReplServerStartMsg.getVersion());
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session.setProtocolVersion(protocolVersion);
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generationId = inReplServerStartMsg.getGenerationId();
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serverId = inReplServerStartMsg.getServerId();
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serverURL = inReplServerStartMsg.getServerURL();
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int separator = serverURL.lastIndexOf(':');
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serverAddressURL =
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session.getRemoteAddress() + ":" + serverURL.substring(separator +
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1);
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setServiceIdAndDomain(inReplServerStartMsg.getBaseDn());
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setInitialServerState(inReplServerStartMsg.getServerState());
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setSendWindowSize(inReplServerStartMsg.getWindowSize());
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if (protocolVersion > ProtocolVersion.REPLICATION_PROTOCOL_V1)
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{
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// We support connection from a V1 RS
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// Only V2 protocol has the group id in repl server start message
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this.groupId = inReplServerStartMsg.getGroupId();
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}
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oldGenerationId = -100;
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// Duplicate server ?
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if (!replicationServerDomain.checkForDuplicateRS(this))
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{
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abortStart(null);
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return false;
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}
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}
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catch(Exception e)
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{
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Message message = Message.raw(e.getLocalizedMessage());
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throw new DirectoryException(ResultCode.OTHER, message);
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}
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return inReplServerStartMsg.getSSLEncryption();
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}
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/**
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* Creates a new handler object to a remote replication server.
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* @param session The session with the remote RS.
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* @param queueSize The queue size to manage updates to that RS.
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* @param replicationServerURL The hosting local RS URL.
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* @param replicationServerId The hosting local RS serverId.
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* @param replicationServer The hosting local RS object.
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* @param rcvWindowSize The receiving window size.
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*/
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public ReplicationServerHandler(
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ProtocolSession session,
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int queueSize,
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String replicationServerURL,
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short replicationServerId,
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ReplicationServer replicationServer,
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int rcvWindowSize)
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{
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super(session, queueSize, replicationServerURL, replicationServerId,
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replicationServer, rcvWindowSize);
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}
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/**
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* Connect the hosting RS to the RS represented by THIS handler
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* on an outgoing connection.
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* @param serviceId The serviceId (usually baseDn).
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* @param sslEncryption The sslEncryption requested to the remote RS.
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* @throws DirectoryException when an error occurs.
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*/
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public void connect(String serviceId, boolean sslEncryption)
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throws DirectoryException
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{
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//
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// the encryption we will request to the peer as we are the session creator
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this.initSslEncryption = sslEncryption;
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setServiceIdAndDomain(serviceId);
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localGenerationId = replicationServerDomain.getGenerationId();
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oldGenerationId = localGenerationId;
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try
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{
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//
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lockDomain(false); // no timeout
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// we are the initiator and decides of the encryption
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boolean sessionInitiatorSSLEncryption = this.initSslEncryption;
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// Send start
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ReplServerStartMsg outReplServerStartMsg =
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sendStartToRemote(ProtocolVersion.getCurrentVersion());
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// Wait answer
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ReplicationMsg msg = session.receive();
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// Reject bad responses
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if (!(msg instanceof ReplServerStartMsg))
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{
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Message message = ERR_REPLICATION_PROTOCOL_MESSAGE_TYPE.get(
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msg.getClass().getCanonicalName(),
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"ReplServerStartMsg");
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abortStart(message);
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return;
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}
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// Process hello from remote
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processStartFromRemote((ReplServerStartMsg)msg);
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// Log
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logStartHandshakeSNDandRCV(outReplServerStartMsg,(ReplServerStartMsg)msg);
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// Until here session is encrypted then it depends on the negociation
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// The session initiator decides whether to use SSL.
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if (!sessionInitiatorSSLEncryption)
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session.stopEncryption();
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if (protocolVersion > ProtocolVersion.REPLICATION_PROTOCOL_V1)
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{
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// Only protocol version above V1 has a phase 2 handshake
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// NOW PROCEDE WITH SECOND PHASE OF HANDSHAKE:
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// TopologyMsg then TopologyMsg (with a RS)
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// Send our own TopologyMsg to remote RS
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TopologyMsg outTopoMsg = sendTopoToRemoteRS();
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// wait and process Topo from remote RS
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TopologyMsg inTopoMsg = waitAndProcessTopoFromRemoteRS();
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logTopoHandshakeSNDandRCV(outTopoMsg, inTopoMsg);
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// FIXME: i think this should be done for all protocol version !!
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// not only those > V1
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registerIntoDomain();
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// Process TopologyMsg sent by remote RS: store matching new info
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// (this will also warn our connected DSs of the new received info)
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replicationServerDomain.receiveTopoInfoFromRS(inTopoMsg, this, false);
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}
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super.finalizeStart();
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}
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catch(IOException ioe)
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{
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// FIXME receive
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}
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// catch(DirectoryException de)
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//{ already logged
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//
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catch(Exception e)
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{
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// FIXME more detailed exceptions
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}
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finally
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{
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// Release domain
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if ((replicationServerDomain != null) &&
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replicationServerDomain.hasLock())
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replicationServerDomain.release();
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}
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}
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/**
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* Starts the handler from a remote ReplServerStart message received from
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* the remote replication server.
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* @param inReplServerStartMsg The provided ReplServerStart message received.
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*/
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public void startFromRemoteRS(ReplServerStartMsg inReplServerStartMsg)
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{
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//
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localGenerationId = -1;
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oldGenerationId = -100;
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try
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{
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// Process start from remote
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boolean sessionInitiatorSSLEncryption =
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processStartFromRemote(inReplServerStartMsg);
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// lock with timeout
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lockDomain(true);
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ReplServerStartMsg outReplServerStartMsg =
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sendStartToRemote(protocolVersion);
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// log
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logStartHandshakeRCVandSND(inReplServerStartMsg, outReplServerStartMsg);
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// until here session is encrypted then it depends on the negotiation
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// The session initiator decides whether to use SSL.
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if (!sessionInitiatorSSLEncryption)
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session.stopEncryption();
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TopologyMsg inTopoMsg = null;
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if (protocolVersion > ProtocolVersion.REPLICATION_PROTOCOL_V1)
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{
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// Only protocol version above V1 has a phase 2 handshake
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// NOW PROCEDE WITH SECOND PHASE OF HANDSHAKE:
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// TopologyMsg then TopologyMsg (with a RS)
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// wait and process Topo from remote RS
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inTopoMsg = waitAndProcessTopoFromRemoteRS();
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// send our own TopologyMsg to remote RS
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TopologyMsg outTopoMsg = sendTopoToRemoteRS();
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// log
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logTopoHandshakeRCVandSND(inTopoMsg, outTopoMsg);
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}
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else
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{
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// Terminate connection from a V1 RS
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// if the remote RS and the local RS have the same genID
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// then it's ok and nothing else to do
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if (generationId == localGenerationId)
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{
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if (debugEnabled())
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{
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TRACER.debugInfo("In " +
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replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() +
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this + " RS V1 with serverID=" + serverId +
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" is connected with the right generation ID");
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}
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} else
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{
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if (localGenerationId > 0)
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{
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// if the local RS is initialized
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if (generationId > 0)
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{
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// if the remote RS is initialized
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if (generationId != localGenerationId)
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{
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// if the 2 RS have different generationID
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if (replicationServerDomain.getGenerationIdSavedStatus())
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{
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// if the present RS has received changes regarding its
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// gen ID and so won't change without a reset
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// then we are just degrading the peer.
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Message message = NOTE_BAD_GENERATION_ID_FROM_RS.get(
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getServiceId(),
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Short.toString(serverId),
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Long.toString(generationId),
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Long.toString(localGenerationId));
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logError(message);
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} else
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{
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// The present RS has never received changes regarding its
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// gen ID.
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//
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// Example case:
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// - we are in RS1
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// - RS2 has genId2 from LS2 (genId2 <=> no data in LS2)
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// - RS1 has genId1 from LS1 /genId1 comes from data in
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// suffix
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// - we are in RS1 and we receive a START msg from RS2
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// - Each RS keeps its genID / is degraded and when LS2
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// will be populated from LS1 everything will become ok.
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//
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// Issue:
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// FIXME : Would it be a good idea in some cases to just
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// set the gen ID received from the peer RS
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// specially if the peer has a non null state and
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// we have a nul state ?
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// replicationServerDomain.
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// setGenerationId(generationId, false);
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Message message = NOTE_BAD_GENERATION_ID_FROM_RS.get(
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getServiceId(),
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Short.toString(serverId),
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Long.toString(generationId),
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Long.toString(localGenerationId));
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logError(message);
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}
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}
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} else
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{
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// The remote RS has no genId. We don't change anything for the
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// current RS.
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}
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} else
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{
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// The local RS is not initialized - take the one received
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oldGenerationId =
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replicationServerDomain.changeGenerationId(generationId, false);
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}
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}
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// Note: the supported scenario for V1->V2 upgrade is to upgrade 1 by 1
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// all the servers of the topology. We prefer not not send a TopologyMsg
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// for giving partial/false information to the V2 servers as for
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// instance we don't have the connected DS of the V1 RS...When the V1
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// RS will be upgraded in his turn, topo info will be sent and accurate.
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// That way, there is no risk to have false/incomplete information in
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// other servers.
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}
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registerIntoDomain();
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// Process TopologyMsg sent by remote RS: store matching new info
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// (this will also warn our connected DSs of the new received info)
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if (inTopoMsg!=null)
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replicationServerDomain.receiveTopoInfoFromRS(inTopoMsg, this, false);
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super.finalizeStart();
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}
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catch(DirectoryException de)
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{
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abortStart(de.getMessageObject());
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}
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catch(Exception e)
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{
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abortStart(Message.raw(e.getLocalizedMessage()));
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}
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finally
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{
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if ((replicationServerDomain != null) &&
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replicationServerDomain.hasLock())
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replicationServerDomain.release();
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}
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}
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/**
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* Registers this handler into its related domain and notifies the domain.
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*/
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private void registerIntoDomain()
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{
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// Alright, connected with new RS (either outgoing or incoming
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// connection): store handler.
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Map<Short, ReplicationServerHandler> connectedRSs =
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replicationServerDomain.getConnectedRSs();
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connectedRSs.put(serverId, this);
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}
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/**
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* Create and send the topologyMsg to the remote replication server.
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* @return the topologyMsg sent.
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*/
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private TopologyMsg sendTopoToRemoteRS()
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throws IOException
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{
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TopologyMsg outTopoMsg = replicationServerDomain.createTopologyMsgForRS();
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session.publish(outTopoMsg);
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return outTopoMsg;
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}
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/**
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* Wait receiving the TopologyMsg from the remote RS and process it.
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* @return the topologyMsg received.
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* @throws DirectoryException
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* @throws IOException
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*/
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private TopologyMsg waitAndProcessTopoFromRemoteRS()
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throws DirectoryException, IOException
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{
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ReplicationMsg msg = null;
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try
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{
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msg = session.receive();
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}
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catch(Exception e)
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{
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Message message = Message.raw(e.getLocalizedMessage());
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throw new DirectoryException(ResultCode.OTHER, message);
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}
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if (!(msg instanceof TopologyMsg))
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{
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Message message = ERR_REPLICATION_PROTOCOL_MESSAGE_TYPE.get(
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msg.getClass().getCanonicalName(),
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"TopologyMsg");
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abortStart(message);
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}
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// Remote RS sent his topo msg
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TopologyMsg inTopoMsg = (TopologyMsg) msg;
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// CONNECTION WITH A RS
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// if the remote RS and the local RS have the same genID
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// then it's ok and nothing else to do
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if (generationId == localGenerationId)
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{
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if (debugEnabled())
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{
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TRACER.debugInfo("In " +
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replicationServerDomain.getReplicationServer().
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getMonitorInstanceName() + " RS with serverID=" + serverId +
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" is connected with the right generation ID, same as local ="
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+ generationId);
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}
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}
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else
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{
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if (localGenerationId > 0)
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{
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// if the local RS is initialized
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if (generationId > 0)
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{
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// if the remote RS is initialized
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if (generationId != localGenerationId)
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{
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// if the 2 RS have different generationID
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if (replicationServerDomain.getGenerationIdSavedStatus())
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{
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// if the present RS has received changes regarding its
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// gen ID and so won't change without a reset
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// then we are just degrading the peer.
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Message message = NOTE_BAD_GENERATION_ID_FROM_RS.get(
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getServiceId(),
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Short.toString(serverId),
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Long.toString(generationId),
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Long.toString(localGenerationId));
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logError(message);
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}
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else
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{
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// The present RS has never received changes regarding its
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// gen ID.
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//
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// Example case:
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// - we are in RS1
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// - RS2 has genId2 from LS2 (genId2 <=> no data in LS2)
|
// - RS1 has genId1 from LS1 /genId1 comes from data in
|
// suffix
|
// - we are in RS1 and we receive a START msg from RS2
|
// - Each RS keeps its genID / is degraded and when LS2
|
// will be populated from LS1 everything will become ok.
|
//
|
// Issue:
|
// FIXME : Would it be a good idea in some cases to just
|
// set the gen ID received from the peer RS
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// specially if the peer has a non null state and
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// we have a nul state ?
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// replicationServerDomain.
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// setGenerationId(generationId, false);
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Message message = NOTE_BAD_GENERATION_ID_FROM_RS.get(
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getServiceId(),
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Short.toString(serverId),
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Long.toString(generationId),
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Long.toString(localGenerationId));
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logError(message);
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}
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}
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}
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else
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{
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// The remote RS has no genId. We don't change anything for the
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// current RS.
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}
|
}
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else
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{
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// The local RS is not initialized - take the one received
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// WARNING: Must be done before computing topo message to send
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// to peer server as topo message must embed valid generation id
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// for our server
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oldGenerationId =
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replicationServerDomain.changeGenerationId(generationId, false);
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}
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}
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return inTopoMsg;
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}
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|
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/**
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* {@inheritDoc}
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*/
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@Override
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public boolean isDataServer()
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{
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return false;
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}
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/**
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* Add the DSinfos of the connected Directory Servers
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* to the List of DSInfo provided as a parameter.
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*
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* @param dsInfos The List of DSInfo that should be updated
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* with the DSInfo for the remoteDirectoryServers
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* connected to this ServerHandler.
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*/
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public void addDSInfos(List<DSInfo> dsInfos)
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{
|
synchronized (remoteDirectoryServers)
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{
|
for (LightweightServerHandler ls : remoteDirectoryServers.values())
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{
|
dsInfos.add(ls.toDSInfo());
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}
|
}
|
}
|
|
/**
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* Shutdown This ServerHandler.
|
*/
|
public void shutdown()
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{
|
super.shutdown();
|
/*
|
* Stop the remote LSHandler
|
*/
|
synchronized (remoteDirectoryServers)
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{
|
for (LightweightServerHandler lsh : remoteDirectoryServers.values())
|
{
|
lsh.stopHandler();
|
}
|
remoteDirectoryServers.clear();
|
}
|
}
|
/**
|
* Stores topology information received from a peer RS and that must be kept
|
* in RS handler.
|
*
|
* @param topoMsg The received topology message
|
*/
|
public void receiveTopoInfoFromRS(TopologyMsg topoMsg)
|
{
|
// Store info for remote RS
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List<RSInfo> rsInfos = topoMsg.getRsList();
|
// List should only contain RS info for sender
|
RSInfo rsInfo = rsInfos.get(0);
|
generationId = rsInfo.getGenerationId();
|
groupId = rsInfo.getGroupId();
|
|
/**
|
* Store info for DSs connected to the peer RS
|
*/
|
List<DSInfo> dsInfos = topoMsg.getDsList();
|
|
synchronized (remoteDirectoryServers)
|
{
|
// Removes the existing structures
|
for (LightweightServerHandler lsh : remoteDirectoryServers.values())
|
{
|
lsh.stopHandler();
|
}
|
remoteDirectoryServers.clear();
|
|
// Creates the new structure according to the message received.
|
for (DSInfo dsInfo : dsInfos)
|
{
|
LightweightServerHandler lsh = new LightweightServerHandler(this,
|
serverId, dsInfo.getDsId(), dsInfo.getGenerationId(),
|
dsInfo.getGroupId(), dsInfo.getStatus(), dsInfo.getRefUrls(),
|
dsInfo.isAssured(), dsInfo.getAssuredMode(),
|
dsInfo.getSafeDataLevel());
|
lsh.startHandler();
|
remoteDirectoryServers.put(lsh.getServerId(), lsh);
|
}
|
}
|
}
|
|
/**
|
* When this handler is connected to a replication server, specifies if
|
* a wanted server is connected to this replication server.
|
*
|
* @param wantedServer The server we want to know if it is connected
|
* to the replication server represented by this handler.
|
* @return boolean True is the wanted server is connected to the server
|
* represented by this handler.
|
*/
|
public boolean isRemoteLDAPServer(short wantedServer)
|
{
|
synchronized (remoteDirectoryServers)
|
{
|
for (LightweightServerHandler server : remoteDirectoryServers.values())
|
{
|
if (wantedServer == server.getServerId())
|
{
|
return true;
|
}
|
}
|
return false;
|
}
|
}
|
|
/**
|
* When the handler is connected to a replication server, specifies the
|
* replication server has remote LDAP servers connected to it.
|
*
|
* @return boolean True is the replication server has remote LDAP servers
|
* connected to it.
|
*/
|
public boolean hasRemoteLDAPServers()
|
{
|
synchronized (remoteDirectoryServers)
|
{
|
return !remoteDirectoryServers.isEmpty();
|
}
|
}
|
|
/**
|
* Return a Set containing the servers known by this replicationServer.
|
* @return a set containing the servers known by this replicationServer.
|
*/
|
public Set<Short> getConnectedDirectoryServerIds()
|
{
|
synchronized (remoteDirectoryServers)
|
{
|
return remoteDirectoryServers.keySet();
|
}
|
}
|
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String getMonitorInstanceName()
|
{
|
String str = serverURL + " " + String.valueOf(serverId);
|
|
return "Connected Replication Server " + str +
|
",cn=" + replicationServerDomain.getMonitorInstanceName();
|
}
|
|
/**
|
* Retrieves a set of attributes containing monitor data that should be
|
* returned to the client if the corresponding monitor entry is requested.
|
*
|
* @return A set of attributes containing monitor data that should be
|
* returned to the client if the corresponding monitor entry is
|
* requested.
|
*/
|
@Override
|
public ArrayList<Attribute> getMonitorData()
|
{
|
// Get the generic ones
|
ArrayList<Attribute> attributes = super.getMonitorData();
|
|
// Add the specific RS ones
|
attributes.add(Attributes.create("Replication-Server",
|
serverURL));
|
|
try
|
{
|
MonitorData md;
|
md = replicationServerDomain.computeMonitorData();
|
|
// Missing changes
|
long missingChanges = md.getMissingChangesRS(serverId);
|
attributes.add(Attributes.create("missing-changes", String
|
.valueOf(missingChanges)));
|
|
/* get the Server State */
|
AttributeBuilder builder = new AttributeBuilder("server-state");
|
ServerState state = md.getRSStates(serverId);
|
if (state != null)
|
{
|
for (String str : state.toStringSet())
|
{
|
builder.add(str);
|
}
|
attributes.add(builder.toAttribute());
|
}
|
}
|
catch (Exception e)
|
{
|
Message message =
|
ERR_ERROR_RETRIEVING_MONITOR_DATA.get(stackTraceToSingleLineString(e));
|
// We failed retrieving the monitor data.
|
attributes.add(Attributes.create("error", message.toString()));
|
}
|
return attributes;
|
}
|
/**
|
* {@inheritDoc}
|
*/
|
@Override
|
public String toString()
|
{
|
String localString;
|
if (serverId != 0)
|
{
|
localString = "Replication Server ";
|
localString += serverId + " " + serverURL + " " + getServiceId();
|
} else
|
localString = "Unknown server";
|
return localString;
|
}
|
/**
|
* Gets the status of the connected DS.
|
* @return The status of the connected DS.
|
*/
|
public ServerStatus getStatus()
|
{
|
return ServerStatus.INVALID_STATUS;
|
}
|
/**
|
* Retrieves the Address URL for this server handler.
|
*
|
* @return The Address URL for this server handler,
|
* in the form of an IP address and port separated by a colon.
|
*/
|
public String getServerAddressURL()
|
{
|
return serverAddressURL;
|
}
|
|
/**
|
* Sends a message containing a generationId to a peer server.
|
* The peer is expected to be a replication server.
|
*
|
* @param msg The GenerationIdMessage message to be sent.
|
* @throws IOException When it occurs while sending the message,
|
*
|
*/
|
public void forwardReplicationMsg(ReplicationMsg msg)
|
throws IOException
|
{
|
session.publish(msg);
|
}
|
|
}
|
