| /* |
| * 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.cassandra.sidecar.cluster; |
| |
| import java.net.InetSocketAddress; |
| import java.util.List; |
| import java.util.concurrent.ExecutionException; |
| import java.util.concurrent.TimeUnit; |
| import java.util.concurrent.TimeoutException; |
| import java.util.stream.Collectors; |
| |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import com.datastax.driver.core.Cluster; |
| import com.datastax.driver.core.NettyOptions; |
| import com.datastax.driver.core.QueryOptions; |
| import com.datastax.driver.core.Session; |
| import com.datastax.driver.core.exceptions.DriverException; |
| import com.datastax.driver.core.exceptions.DriverInternalError; |
| import com.datastax.driver.core.policies.ExponentialReconnectionPolicy; |
| import com.datastax.driver.core.policies.LoadBalancingPolicy; |
| import com.datastax.driver.core.policies.ReconnectionPolicy; |
| import org.apache.cassandra.sidecar.common.CQLSessionProvider; |
| import org.apache.cassandra.sidecar.common.utils.DriverUtils; |
| import org.apache.cassandra.sidecar.config.DriverConfiguration; |
| import org.apache.cassandra.sidecar.config.SidecarConfiguration; |
| import org.jetbrains.annotations.Nullable; |
| import org.jetbrains.annotations.VisibleForTesting; |
| |
| /** |
| * Provides connections to the local Cassandra cluster as defined in the Configuration. Currently, it only supports |
| * returning the local connection. |
| */ |
| public class CQLSessionProviderImpl implements CQLSessionProvider |
| { |
| private static final Logger logger = LoggerFactory.getLogger(CQLSessionProviderImpl.class); |
| private final List<InetSocketAddress> contactPoints; |
| private final int numConnections; |
| private final String localDc; |
| private final NettyOptions nettyOptions; |
| private final ReconnectionPolicy reconnectionPolicy; |
| private final List<InetSocketAddress> localInstances; |
| private final DriverUtils driverUtils; |
| @Nullable |
| private volatile Session session; |
| |
| @VisibleForTesting |
| public CQLSessionProviderImpl(List<InetSocketAddress> contactPoints, |
| List<InetSocketAddress> localInstances, |
| int healthCheckFrequencyMillis, |
| String localDc, |
| int numConnections, |
| NettyOptions options) |
| { |
| this.contactPoints = contactPoints; |
| this.localInstances = localInstances; |
| this.localDc = localDc; |
| this.numConnections = numConnections; |
| this.nettyOptions = options; |
| this.reconnectionPolicy = new ExponentialReconnectionPolicy(500, healthCheckFrequencyMillis); |
| this.driverUtils = new DriverUtils(); |
| } |
| |
| public CQLSessionProviderImpl(SidecarConfiguration configuration, |
| NettyOptions options, |
| DriverUtils driverUtils) |
| { |
| this.driverUtils = driverUtils; |
| DriverConfiguration driverConfiguration = configuration.driverConfiguration(); |
| this.contactPoints = driverConfiguration.contactPoints(); |
| this.localInstances = configuration.cassandraInstances() |
| .stream() |
| .map(i -> new InetSocketAddress(i.host(), i.port())) |
| .collect(Collectors.toList()); |
| this.localDc = driverConfiguration.localDc(); |
| this.numConnections = driverConfiguration.numConnections(); |
| this.nettyOptions = options; |
| int maxDelayMs = configuration.healthCheckConfiguration().checkIntervalMillis(); |
| this.reconnectionPolicy = new ExponentialReconnectionPolicy(500, maxDelayMs); |
| } |
| |
| static RuntimeException propagateCause(ExecutionException e) |
| { |
| Throwable cause = e.getCause(); |
| |
| if (cause instanceof Error) throw ((Error) cause); |
| |
| // We could just rethrow e.getCause(). However, the cause of the ExecutionException has likely |
| // been |
| // created on the I/O thread receiving the response. Which means that the stacktrace associated |
| // with said cause will make no mention of the current thread. This is painful for say, finding |
| // out which execute() statement actually raised the exception. So instead, we re-create the |
| // exception. |
| if (cause instanceof DriverException) throw ((DriverException) cause).copy(); |
| else throw new DriverInternalError("Unexpected exception thrown", cause); |
| } |
| |
| /** |
| * Provides a Session connected to the cluster. If null it means the connection was |
| * could not be established. The session still might throw a NoHostAvailableException if the |
| * cluster is otherwise unreachable. |
| * |
| * @return Session |
| */ |
| @Nullable |
| public synchronized Session get() |
| { |
| if (session != null) |
| { |
| return session; |
| } |
| Cluster cluster = null; |
| try |
| { |
| logger.info("Connecting to cluster using contact points {}", contactPoints); |
| |
| LoadBalancingPolicy lbp = new SidecarLoadBalancingPolicy(localInstances, localDc, numConnections, |
| driverUtils); |
| // Prevent spurious reconnects of ignored down nodes on `onUp` events |
| QueryOptions queryOptions = new QueryOptions().setReprepareOnUp(false); |
| cluster = Cluster.builder() |
| .addContactPointsWithPorts(contactPoints) |
| .withReconnectionPolicy(reconnectionPolicy) |
| .withoutMetrics() |
| .withLoadBalancingPolicy(lbp) |
| .withQueryOptions(queryOptions) |
| // tests can create a lot of these Cluster objects, to avoid creating HWTs and |
| // event thread pools for each we have the override |
| .withNettyOptions(nettyOptions) |
| .build(); |
| session = cluster.connect(); |
| logger.info("Successfully connected to Cassandra!"); |
| } |
| catch (Exception e) |
| { |
| logger.error("Failed to reach Cassandra", e); |
| if (cluster != null) |
| { |
| try |
| { |
| cluster.close(); |
| } |
| catch (Exception ex) |
| { |
| logger.error("Failed to close cluster in cleanup", ex); |
| } |
| } |
| } |
| return session; |
| } |
| |
| @Override |
| public Session getIfConnected() |
| { |
| return session; |
| } |
| |
| @Override |
| public void close() |
| { |
| Session localSession; |
| synchronized (this) |
| { |
| localSession = this.session; |
| this.session = null; |
| } |
| if (localSession != null) |
| { |
| try |
| { |
| localSession.getCluster().closeAsync().get(1, TimeUnit.MINUTES); |
| } |
| catch (InterruptedException e) |
| { |
| Thread.currentThread().interrupt(); |
| } |
| catch (TimeoutException e) |
| { |
| logger.warn("Unable to close session after 1 minute for provider {}", this, e); |
| } |
| catch (ExecutionException e) |
| { |
| throw propagateCause(e); |
| } |
| } |
| } |
| } |