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Java-based middleware for in-memory processing of big data in a distributed environment.
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/*
 * 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.ignite.spi.discovery.zk;

import java.io.IOException;
import java.io.Serializable;
import java.net.InetAddress;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import org.apache.ignite.IgniteLogger;
import org.apache.ignite.cluster.ClusterNode;
import org.apache.ignite.internal.IgniteFeatures;
import org.apache.ignite.internal.managers.discovery.IgniteDiscoverySpi;
import org.apache.ignite.internal.managers.discovery.IgniteDiscoverySpiInternalListener;
import org.apache.ignite.internal.processors.metric.MetricRegistry;
import org.apache.ignite.internal.util.tostring.GridToStringExclude;
import org.apache.ignite.internal.util.tostring.GridToStringInclude;
import org.apache.ignite.internal.util.typedef.internal.A;
import org.apache.ignite.internal.util.typedef.internal.S;
import org.apache.ignite.internal.util.typedef.internal.U;
import org.apache.ignite.lang.IgniteBiTuple;
import org.apache.ignite.lang.IgniteProductVersion;
import org.apache.ignite.resources.LoggerResource;
import org.apache.ignite.spi.IgniteSpiAdapter;
import org.apache.ignite.spi.IgniteSpiConfiguration;
import org.apache.ignite.spi.IgniteSpiContext;
import org.apache.ignite.spi.IgniteSpiException;
import org.apache.ignite.spi.IgniteSpiMBeanAdapter;
import org.apache.ignite.spi.IgniteSpiMultipleInstancesSupport;
import org.apache.ignite.spi.communication.CommunicationSpi;
import org.apache.ignite.spi.communication.tcp.TcpCommunicationSpi;
import org.apache.ignite.spi.discovery.DiscoveryMetricsProvider;
import org.apache.ignite.spi.discovery.DiscoverySpiCustomMessage;
import org.apache.ignite.spi.discovery.DiscoverySpiDataExchange;
import org.apache.ignite.spi.discovery.DiscoverySpiHistorySupport;
import org.apache.ignite.spi.discovery.DiscoverySpiListener;
import org.apache.ignite.spi.discovery.DiscoverySpiMutableCustomMessageSupport;
import org.apache.ignite.spi.discovery.DiscoverySpiNodeAuthenticator;
import org.apache.ignite.spi.discovery.DiscoverySpiOrderSupport;
import org.apache.ignite.spi.discovery.zk.internal.ZkIgnitePaths;
import org.apache.ignite.spi.discovery.zk.internal.ZookeeperClusterNode;
import org.apache.ignite.spi.discovery.zk.internal.ZookeeperDiscoveryImpl;
import org.apache.ignite.spi.discovery.zk.internal.ZookeeperDiscoveryStatistics;
import org.jetbrains.annotations.Nullable;

import static org.apache.ignite.IgniteSystemProperties.IGNITE_CONSISTENT_ID_BY_HOST_WITHOUT_PORT;
import static org.apache.ignite.IgniteSystemProperties.getBoolean;
import static org.apache.ignite.internal.managers.discovery.GridDiscoveryManager.DISCO_METRICS;

/**
 * Zookeeper Discovery Spi.
 */
@IgniteSpiMultipleInstancesSupport(true)
@DiscoverySpiOrderSupport(true)
@DiscoverySpiHistorySupport(true)
@DiscoverySpiMutableCustomMessageSupport(false)
public class ZookeeperDiscoverySpi extends IgniteSpiAdapter implements IgniteDiscoverySpi {
    /** */
    public static final String DFLT_ROOT_PATH = "/apacheIgnite";

    /** */
    public static final long DFLT_JOIN_TIMEOUT = 0;

    /** */
    @GridToStringInclude
    private String zkRootPath = DFLT_ROOT_PATH;

    /** */
    @GridToStringInclude
    private String zkConnectionString;

    /** */
    private long joinTimeout = DFLT_JOIN_TIMEOUT;

    /** */
    @GridToStringInclude
    private long sesTimeout;

    /** */
    private boolean clientReconnectDisabled;

    /** */
    @GridToStringExclude
    private DiscoverySpiListener lsnr;

    /** */
    @GridToStringExclude
    private DiscoverySpiDataExchange exchange;

    /** */
    @GridToStringExclude
    private DiscoverySpiNodeAuthenticator nodeAuth;

    /** */
    @GridToStringExclude
    private DiscoveryMetricsProvider metricsProvider;

    /** */
    @GridToStringExclude
    private ZookeeperDiscoveryImpl impl;

    /** */
    @GridToStringExclude
    private Map locNodeAttrs;

    /** */
    @GridToStringExclude
    private IgniteProductVersion locNodeVer;

    /** */
    @GridToStringExclude
    private Serializable consistentId;

    /** Local node addresses. */
    private IgniteBiTuple, Collection> addrs;

    /** */
    @LoggerResource
    @GridToStringExclude
    private IgniteLogger log;

    /** */
    private IgniteDiscoverySpiInternalListener internalLsnr;

    /** */
    private final ZookeeperDiscoveryStatistics stats = new ZookeeperDiscoveryStatistics();

    /**
     * @return Base path in ZK for znodes created by SPI.
     */
    public String getZkRootPath() {
        return zkRootPath;
    }

    /**
     * @param zkRootPath Base path in ZooKeeper for znodes created by SPI.
     * @return {@code this} for chaining.
     */
    @IgniteSpiConfiguration(optional = true)
    public ZookeeperDiscoverySpi setZkRootPath(String zkRootPath) {
        this.zkRootPath = zkRootPath;

        return this;
    }

    /**
     * @return ZooKeeper session timeout.
     */
    public long getSessionTimeout() {
        return sesTimeout;
    }

    /**
     * @param sesTimeout ZooKeeper session timeout.
     * @return {@code this} for chaining.
     */
    @IgniteSpiConfiguration(optional = true)
    public ZookeeperDiscoverySpi setSessionTimeout(long sesTimeout) {
        this.sesTimeout = sesTimeout;

        return this;
    }

    /**
     * @return Cluster join timeout.
     */
    public long getJoinTimeout() {
        return joinTimeout;
    }

    /**
     * @param joinTimeout Cluster join timeout ({@code 0} means wait forever).
     * @return {@code this} for chaining.
     */
    @IgniteSpiConfiguration(optional = true)
    public ZookeeperDiscoverySpi setJoinTimeout(long joinTimeout) {
        this.joinTimeout = joinTimeout;

        return this;
    }

    /**
     * @return ZooKeeper connection string
     */
    public String getZkConnectionString() {
        return zkConnectionString;
    }

    /**
     * @param zkConnectionString ZooKeeper connection string
     * @return {@code this} for chaining.
     */
    @IgniteSpiConfiguration(optional = false)
    public ZookeeperDiscoverySpi setZkConnectionString(String zkConnectionString) {
        this.zkConnectionString = zkConnectionString;

        return this;
    }

    /**
     * If {@code true} client does not try to reconnect.
     *
     * @return Client reconnect disabled flag.
     */
    public boolean isClientReconnectDisabled() {
        return clientReconnectDisabled;
    }

    /**
     * Sets client reconnect disabled flag.
     *
     * @param clientReconnectDisabled Client reconnect disabled flag.
     * @return {@code this} for chaining.
     */
    @IgniteSpiConfiguration(optional = true)
    public ZookeeperDiscoverySpi setClientReconnectDisabled(boolean clientReconnectDisabled) {
        this.clientReconnectDisabled = clientReconnectDisabled;

        return this;
    }

    /** {@inheritDoc} */
    @Override public boolean clientReconnectSupported() {
        return !clientReconnectDisabled;
    }

    /** {@inheritDoc} */
    @Override public void clientReconnect() {
        impl.reconnect();
    }

    /** {@inheritDoc} */
    @Override public boolean knownNode(UUID nodeId) {
        return impl.knownNode(nodeId);
    }

    /** {@inheritDoc} */
    @Override public boolean supportsCommunicationFailureResolve() {
        return true;
    }

    /** {@inheritDoc} */
    @Override public void resolveCommunicationFailure(ClusterNode node, Exception err) {
        impl.resolveCommunicationError(node, err);
    }

    /** {@inheritDoc} */
    @Nullable @Override public Serializable consistentId() throws IgniteSpiException {
        if (consistentId == null) {
            consistentId = ignite.configuration().getConsistentId();

            if (consistentId == null) {
                initAddresses();

                final List sortedAddrs = new ArrayList<>(addrs.get1());

                Collections.sort(sortedAddrs);

                if (getBoolean(IGNITE_CONSISTENT_ID_BY_HOST_WITHOUT_PORT))
                    consistentId = U.consistentId(sortedAddrs);
                else {
                    Integer commPort = null;

                    if (locNodeAttrs != null) {
                        commPort = (Integer)locNodeAttrs.get(
                            TcpCommunicationSpi.class.getSimpleName() + "." + TcpCommunicationSpi.ATTR_PORT);
                    }
                    else {
                        CommunicationSpi commSpi = ignite.configuration().getCommunicationSpi();

                        if (commSpi instanceof TcpCommunicationSpi) {
                            commPort = ((TcpCommunicationSpi)commSpi).boundPort();

                            if (commPort == -1)
                                commPort = null;
                        }
                    }

                    if (commPort == null) {
                        U.warn(log, "Can not initialize default consistentId, TcpCommunicationSpi port is not initialized.");

                        consistentId = ignite.configuration().getNodeId();
                    }
                    else
                        consistentId = U.consistentId(sortedAddrs, commPort);
                }
            }
        }

        return consistentId;
    }

    /**
     *
     */
    private void initAddresses() {
        if (addrs == null) {
            String locHost = ignite != null ? ignite.configuration().getLocalHost() : null;

            InetAddress locAddr;

            try {
                locAddr = U.resolveLocalHost(locHost);
            }
            catch (IOException e) {
                throw new IgniteSpiException("Unknown local address: " + locHost, e);
            }

            try {
                addrs = U.resolveLocalAddresses(locAddr);
            }
            catch (Exception e) {
                throw new IgniteSpiException("Failed to resolve local host to set of external addresses: " + locHost,
                    e);
            }
        }
    }

    /** {@inheritDoc} */
    @Override public Collection getRemoteNodes() {
        return impl.remoteNodes();
    }

    /** {@inheritDoc} */
    @Override public boolean allNodesSupport(IgniteFeatures feature) {
        if (impl == null)
            return false;

        return impl.allNodesSupport(feature);
    }

    /** {@inheritDoc} */
    @Override public ClusterNode getLocalNode() {
        return impl != null ? impl.localNode() : null;
    }

    /** {@inheritDoc} */
    @Nullable @Override public ClusterNode getNode(UUID nodeId) {
        return impl.node(nodeId);
    }

    /** {@inheritDoc} */
    @Override public boolean pingNode(UUID nodeId) {
        return impl.pingNode(nodeId);
    }

    /** {@inheritDoc} */
    @Override public void setNodeAttributes(Map attrs, IgniteProductVersion ver) {
        assert locNodeAttrs == null;
        assert locNodeVer == null;

        if (log.isDebugEnabled()) {
            log.debug("Node attributes to set: " + attrs);
            log.debug("Node version to set: " + ver);
        }

        locNodeAttrs = attrs;
        locNodeVer = ver;
    }

    /** {@inheritDoc} */
    @Override public void setListener(@Nullable DiscoverySpiListener lsnr) {
        this.lsnr = lsnr;
    }

    /** {@inheritDoc} */
    @Override public void setDataExchange(DiscoverySpiDataExchange exchange) {
        this.exchange = exchange;
    }

    /** {@inheritDoc} */
    @Override public void setMetricsProvider(DiscoveryMetricsProvider metricsProvider) {
        this.metricsProvider = metricsProvider;
    }

    /** {@inheritDoc} */
    @Override public void disconnect() throws IgniteSpiException {
        impl.stop();
    }

    /** {@inheritDoc} */
    @Override public void setAuthenticator(DiscoverySpiNodeAuthenticator auth) {
        nodeAuth = auth;
    }

    /**
     * @return Authenticator.
     */
    public DiscoverySpiNodeAuthenticator getAuthenticator() {
        return nodeAuth;
    }

    /** {@inheritDoc} */
    @Override public long getGridStartTime() {
        return impl.gridStartTime();
    }

    /** {@inheritDoc} */
    @Override public void sendCustomEvent(DiscoverySpiCustomMessage msg) {
        IgniteDiscoverySpiInternalListener internalLsnr = impl.internalLsnr;

        if (internalLsnr != null) {
            if (!internalLsnr.beforeSendCustomEvent(this, log, msg))
                return;
        }

        impl.sendCustomMessage(msg);
    }

    /** {@inheritDoc} */
    @Override public void failNode(UUID nodeId, @Nullable String warning) {
        impl.failNode(nodeId, warning);
    }

    /** {@inheritDoc} */
    @Override public boolean isClientMode() throws IllegalStateException {
        return impl.localNode().isClient();
    }

    /** {@inheritDoc} */
    @Override public void spiStart(@Nullable String igniteInstanceName) throws IgniteSpiException {
        startStopwatch();

        if (sesTimeout == 0)
            sesTimeout = ignite.configuration().getFailureDetectionTimeout().intValue();

        assertParameter(sesTimeout > 0, "sessionTimeout > 0");

        A.notNullOrEmpty(zkConnectionString, "zkConnectionString can not be empty");

        A.notNullOrEmpty(zkRootPath, "zkRootPath can not be empty");

        zkRootPath = zkRootPath.trim();

        if (zkRootPath.endsWith("/"))
            zkRootPath = zkRootPath.substring(0, zkRootPath.length() - 1);

        try {
            ZkIgnitePaths.validatePath(zkRootPath);
        }
        catch (IllegalArgumentException e) {
            throw new IgniteSpiException("zkRootPath is invalid: " + zkRootPath, e);
        }

        ZookeeperClusterNode locNode = initLocalNode();

        if (log.isInfoEnabled()) {
            log.info("Start Zookeeper discovery [zkConnectionString=" + zkConnectionString +
                ", sessionTimeout=" + sesTimeout +
                ", zkRootPath=" + zkRootPath + ']');
        }

        impl = new ZookeeperDiscoveryImpl(
            this,
            igniteInstanceName,
            log,
            zkRootPath,
            locNode,
            lsnr,
            exchange,
            internalLsnr,
            stats);

        registerMBean(igniteInstanceName, new ZookeeperDiscoverySpiMBeanImpl(this), ZookeeperDiscoverySpiMBean.class);

        try {
            impl.startJoinAndWait();
        }
        catch (InterruptedException e) {
            Thread.currentThread().interrupt();

            throw new IgniteSpiException("Failed to join cluster, thread was interrupted", e);
        }
    }

    /** {@inheritDoc} */
    @Override protected void onContextInitialized0(IgniteSpiContext spiCtx) throws IgniteSpiException {
        super.onContextInitialized0(spiCtx);

        MetricRegistry discoReg = (MetricRegistry)getSpiContext().getOrCreateMetricRegistry(DISCO_METRICS);

        stats.registerMetrics(discoReg);

        discoReg.register("Coordinator", () -> impl.getCoordinator(), UUID.class, "Coordinator ID");
    }

    /** {@inheritDoc} */
    @Override public void setInternalListener(IgniteDiscoverySpiInternalListener lsnr) {
        if (impl != null)
            impl.internalLsnr = lsnr;
        else
            internalLsnr = lsnr;
    }

    /** {@inheritDoc} */
    @Override public void simulateNodeFailure() {
        impl.simulateNodeFailure();
    }

    /** {@inheritDoc} */
    @Override public void spiStop() throws IgniteSpiException {
        unregisterMBean();

        if (impl != null)
            impl.stop();
    }

    /**
     * @return Local node attributes
     */
    public Map getLocNodeAttrs() {
        return locNodeAttrs;
    }

    /**
     * @return Local node instance.
     */
    private ZookeeperClusterNode initLocalNode() {
        assert ignite != null;

        initAddresses();

        ZookeeperClusterNode locNode = new ZookeeperClusterNode(
            ignite.configuration().getNodeId(),
            addrs.get1(),
            addrs.get2(),
            locNodeVer,
            locNodeAttrs,
            consistentId(),
            sesTimeout,
            ignite.configuration().isClientMode(),
            metricsProvider);

        locNode.local(true);

        DiscoverySpiListener lsnr = this.lsnr;

        if (lsnr != null)
            lsnr.onLocalNodeInitialized(locNode);

        if (log.isDebugEnabled())
            log.debug("Local node initialized: " + locNode);

        if (metricsProvider != null) {
            locNode.setMetrics(metricsProvider.metrics());
            locNode.setCacheMetrics(metricsProvider.cacheMetrics());
        }

        return locNode;
    }

    /**
     * Used in tests (called via reflection).
     *
     * @return Copy of SPI.
     */
    private ZookeeperDiscoverySpi cloneSpiConfiguration() {
        ZookeeperDiscoverySpi spi = new ZookeeperDiscoverySpi();

        spi.setZkRootPath(zkRootPath);
        spi.setZkConnectionString(zkConnectionString);
        spi.setSessionTimeout(sesTimeout);
        spi.setJoinTimeout(joinTimeout);
        spi.setClientReconnectDisabled(clientReconnectDisabled);

        return spi;
    }

    /** {@inheritDoc} */
    @Override public String toString() {
        return S.toString(ZookeeperDiscoverySpi.class, this);
    }

    /** */
    private class ZookeeperDiscoverySpiMBeanImpl extends IgniteSpiMBeanAdapter implements ZookeeperDiscoverySpiMBean {
        /** {@inheritDoc} */
        public ZookeeperDiscoverySpiMBeanImpl(IgniteSpiAdapter spiAdapter) {
            super(spiAdapter);
        }

        /** {@inheritDoc} */
        @Override public String getSpiState() {
            return impl.getSpiState();
        }

        /** {@inheritDoc} */
        @Override public long getNodesJoined() {
            return stats.joinedNodesCnt();
        }

        /** {@inheritDoc} */
        @Override public long getNodesLeft() {
            return stats.leftNodesCnt();
        }

        /** {@inheritDoc} */
        @Override public long getNodesFailed() {
            return stats.failedNodesCnt();
        }

        /** {@inheritDoc} */
        @Override public long getCommErrorProcNum() {
            return stats.commErrorCount();
        }

        /** {@inheritDoc} */
        @Override public @Nullable UUID getCoordinator() {
            return impl.getCoordinator();
        }

        /** {@inheritDoc} */
        @Override public @Nullable String getCoordinatorNodeFormatted() {
            return String.valueOf(impl.node(impl.getCoordinator()));
        }

        /** {@inheritDoc} */
        @Override public String getLocalNodeFormatted() {
            return String.valueOf(getLocalNode());
        }

        /** {@inheritDoc} */
        @Override public void excludeNode(String nodeId) {
            UUID node;

            try {
                node = UUID.fromString(nodeId);
            }
            catch (IllegalArgumentException e) {
                U.error(log, "Failed to parse node ID: " + nodeId, e);

                return;
            }

            String msg = "Node excluded, node=" + nodeId + "using JMX interface, initiator=" + getLocalNodeId();

            impl.failNode(node, msg);
        }

        /** {@inheritDoc} */
        @Override public String getZkConnectionString() {
            return zkConnectionString;
        }

        /** {@inheritDoc} */
        @Override public long getZkSessionTimeout() {
            return sesTimeout;
        }

        /** {@inheritDoc} */
        @Override public String getZkSessionId() {
            return impl.getZkSessionId();
        }

        /** {@inheritDoc} */
        @Override public String getZkRootPath() {
            return zkRootPath;
        }

        /** {@inheritDoc} */
        @Override public long getNodeOrder() {
            return getLocalNode().order();
        }
    }
}