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https://issues.apache.org/jira/browse/BEAM-1240?focusedWorklogId=125193&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-125193
]
ASF GitHub Bot logged work on BEAM-1240:
----------------------------------------
Author: ASF GitHub Bot
Created on: 19/Jul/18 19:03
Start Date: 19/Jul/18 19:03
Worklog Time Spent: 10m
Work Description: jkff commented on a change in pull request #1729:
[BEAM-1240] Create RabbitMqIO
URL: https://github.com/apache/beam/pull/1729#discussion_r203837280
##########
File path:
sdks/java/io/rabbitmq/src/main/java/org/apache/beam/sdk/io/rabbitmq/RabbitMqIO.java
##########
@@ -0,0 +1,655 @@
+/*
+ * 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.beam.sdk.io.rabbitmq;
+
+import static com.google.common.base.Preconditions.checkArgument;
+
+import com.google.auto.value.AutoValue;
+import com.rabbitmq.client.Channel;
+import com.rabbitmq.client.Connection;
+import com.rabbitmq.client.ConnectionFactory;
+import com.rabbitmq.client.MessageProperties;
+import com.rabbitmq.client.QueueingConsumer;
+import java.io.IOException;
+import java.io.Serializable;
+import java.net.URISyntaxException;
+import java.nio.charset.StandardCharsets;
+import java.security.KeyManagementException;
+import java.security.NoSuchAlgorithmException;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.NoSuchElementException;
+import java.util.concurrent.TimeoutException;
+import javax.annotation.Nullable;
+import org.apache.beam.sdk.annotations.Experimental;
+import org.apache.beam.sdk.coders.Coder;
+import org.apache.beam.sdk.coders.SerializableCoder;
+import org.apache.beam.sdk.io.UnboundedSource;
+import org.apache.beam.sdk.options.PipelineOptions;
+import org.apache.beam.sdk.transforms.DoFn;
+import org.apache.beam.sdk.transforms.PTransform;
+import org.apache.beam.sdk.transforms.ParDo;
+import org.apache.beam.sdk.values.PBegin;
+import org.apache.beam.sdk.values.PCollection;
+import org.joda.time.Duration;
+import org.joda.time.Instant;
+
+/**
+ * A IO to publish or consume messages with a RabbitMQ broker.
+ *
+ * <h3>Consuming messages from RabbitMQ server</h3>
+ *
+ * <p>{@link RabbitMqIO} {@link Read} returns an unbounded {@link PCollection}
containing RabbitMQ
+ * messages body (as {@code byte[]}) wrapped as {@link RabbitMqMessage}.
+ *
+ * <p>To configure a RabbitMQ source, you have to provide a RabbitMQ {@code
URI} to connect to a
+ * RabbitMQ broker. The following example illustrates various options for
configuring the source,
+ * reading from the queue:
+ *
+ * <pre>{@code
+ * pipeline.apply(
+ *
RabbitMqIO.read().withUri("amqp://user:password@localhost:5672").withQueue("QUEUE")
+ *
+ * }</pre>
+ *
+ * <p>It's also possible to read from an exchange (providing the exchange type
and routing key)
+ * instead of directly from a queue:
+ *
+ * <pre>{@code
+ * pipeline.apply(
+ *
RabbitMqIO.read().withUri("amqp://user:password@localhost:5672").withExchange("EXCHANGE",
"fanout", "QUEUE");
+ * }</pre>
+ *
+ * <h3>Publishing messages to RabbitMQ server</h3>
+ *
+ * <p>{@link RabbitMqIO} {@link Write} can send {@code byte[]} to a RabbitMQ
server queue or
+ * exchange.
+ *
+ * <p>As for the {@link Read}, the {@link Write} is configured with a RabbitMQ
URI.
+ *
+ * <p>For instance, you can write to an exchange (providing the exchange type):
+ *
+ * <pre>{@code
+ * pipeline
+ * .apply(...) // provide PCollection<RabbitMqMessage>
+ *
.apply(RabbitMqIO.write().withUri("amqp://user:password@localhost:5672").withExchange("EXCHANGE",
"fanout"));
+ * }</pre>
+ *
+ * <p>For instance, you can write to a queue:
+ *
+ * <pre>{@code
+ * pipeline
+ * .apply(...) // provide PCollection<RabbitMqMessage>
+ *
.apply(RabbitMqIO.write().withUri("amqp://user:password@localhost:5672").withQueue("QUEUE"));
+ *
+ * }</pre>
+ */
+@Experimental(Experimental.Kind.SOURCE_SINK)
+public class RabbitMqIO {
+ public static Read read() {
+ return new AutoValue_RabbitMqIO_Read.Builder()
+ .setQueueDeclare(false)
+ .setMaxReadTime(null)
+ .setMaxNumRecords(Long.MAX_VALUE)
+ .setUseCorrelationId(false)
+ .build();
+ }
+
+ public static Write write() {
+ return new AutoValue_RabbitMqIO_Write.Builder()
+ .setExchangeDeclare(false)
+ .setQueueDeclare(false)
+ .build();
+ }
+
+ private RabbitMqIO() {}
+
+ private static class ConnectionHandler {
+
+ private final ConnectionFactory connectionFactory;
+ private Connection connection;
+ private Channel channel;
+
+ public ConnectionHandler(String uri)
+ throws URISyntaxException, NoSuchAlgorithmException,
KeyManagementException {
+ connectionFactory = new ConnectionFactory();
+ connectionFactory.setUri(uri);
+ connectionFactory.setAutomaticRecoveryEnabled(true);
+ connectionFactory.setConnectionTimeout(60000);
+ connectionFactory.setNetworkRecoveryInterval(5000);
+ connectionFactory.setRequestedHeartbeat(60);
+ connectionFactory.setTopologyRecoveryEnabled(true);
+ connectionFactory.setRequestedChannelMax(0);
+ connectionFactory.setRequestedFrameMax(0);
+ }
+
+ public void start() throws TimeoutException, IOException {
+ connection = connectionFactory.newConnection();
+ channel = connection.createChannel();
+ if (channel == null) {
+ throw new IOException("No RabbitMQ channel available");
+ }
+ }
+
+ public Channel getChannel() {
+ return this.channel;
+ }
+
+ public void stop() throws IOException {
+ if (channel != null) {
+ try {
+ channel.close();
+ } catch (Exception e) {
+ // ignore
+ }
+ }
+ if (connection != null) {
+ connection.close();
+ }
+ }
+ }
+
+ /** A {@link PTransform} to consume messages from RabbitMQ server. */
+ @AutoValue
+ public abstract static class Read extends PTransform<PBegin,
PCollection<RabbitMqMessage>> {
+ @Nullable
+ abstract String uri();
+
+ @Nullable
+ abstract String queue();
+
+ abstract boolean queueDeclare();
+
+ @Nullable
+ abstract String exchange();
+
+ @Nullable
+ abstract String exchangeType();
+
+ @Nullable
+ abstract String routingKey();
+
+ abstract boolean useCorrelationId();
+
+ abstract long maxNumRecords();
+
+ @Nullable
+ abstract Duration maxReadTime();
+
+ abstract Builder builder();
+
+ @AutoValue.Builder
+ abstract static class Builder {
+ abstract Builder setUri(String uri);
+
+ abstract Builder setQueue(String queue);
+
+ abstract Builder setQueueDeclare(boolean queueDeclare);
+
+ abstract Builder setExchange(String exchange);
+
+ abstract Builder setExchangeType(String exchangeType);
+
+ abstract Builder setRoutingKey(String routingKey);
+
+ abstract Builder setUseCorrelationId(boolean useCorrelationId);
+
+ abstract Builder setMaxNumRecords(long maxNumRecords);
+
+ abstract Builder setMaxReadTime(Duration maxReadTime);
+
+ abstract Read build();
+ }
+
+ public Read withUri(String uri) {
+ checkArgument(uri != null, "uri can not be null");
+ return builder().setUri(uri).build();
+ }
+
+ /**
+ * If you want to directly consume messages from a specific queue, you
just have to specify the
+ * queue name. Optionally, you can declare the queue using {@link
+ * RabbitMqIO.Read#withQueueDeclare(boolean)}.
+ */
+ public Read withQueue(String queue) {
+ checkArgument(queue != null, "queue can not be null");
+ return builder().setQueue(queue).build();
+ }
+
+ /**
+ * You can "force" the declaration of a queue on the RabbitMQ broker.
Exchanges and queues are
+ * the high-level building blocks of AMQP. These must be "declared" before
they can be used.
+ * Declaring either type of object simply ensures that one of that name
exists, creating it if
+ * necessary.
+ *
+ * @param queueDeclare If {@code true}, {@link RabbitMqIO} will declare
the queue. If another
+ * application declare the queue, it's not required.
+ */
+ public Read withQueueDeclare(boolean queueDeclare) {
+ return builder().setQueueDeclare(queueDeclare).build();
+ }
+
+ /**
+ * Instead of consuming messages on a specific queue, you can consume
message from a given
+ * exchange. Then you specify the exchange name, type and optionally
routing key where you want
+ * to consume messages.
+ */
+ public Read withExchange(String name, String type, String routingKey) {
+ checkArgument(name != null, "name can not be null");
+ checkArgument(type != null, "type can not be null");
+ return
builder().setExchange(name).setExchangeType(type).setRoutingKey(routingKey).build();
+ }
+
+ /**
+ * Define the max number of records received by the {@link Read}. When
this max number of
+ * records is lower than {@code Long.MAX_VALUE}, the {@link Read} will
provide a bounded {@link
+ * PCollection}.
+ */
+ public Read withMaxNumRecords(long maxNumRecords) {
+ checkArgument(maxReadTime() == null, "maxNumRecord and maxReadTime are
exclusive");
+ return builder().setMaxNumRecords(maxNumRecords).build();
+ }
+
+ /**
+ * Define the max read time (duration) while the {@link Read} will receive
messages. When this
+ * max read time is not null, the {@link Read} will provide a bounded
{@link PCollection}.
+ */
+ public Read withMaxReadTime(Duration maxReadTime) {
+ checkArgument(
+ maxNumRecords() == Long.MAX_VALUE, "maxNumRecord and maxReadTime are
exclusive");
+ return builder().setMaxReadTime(maxReadTime).build();
+ }
+
+ @Override
+ public PCollection<RabbitMqMessage> expand(PBegin input) {
+ org.apache.beam.sdk.io.Read.Unbounded<RabbitMqMessage> unbounded =
+ org.apache.beam.sdk.io.Read.from(new RabbitMQSource(this));
+
+ PTransform<PBegin, PCollection<RabbitMqMessage>> transform = unbounded;
+
+ if (maxNumRecords() < Long.MAX_VALUE || maxReadTime() != null) {
+ transform =
unbounded.withMaxReadTime(maxReadTime()).withMaxNumRecords(maxNumRecords());
+ }
+
+ return input.getPipeline().apply(transform);
+ }
+ }
+
+ static class RabbitMQSource extends UnboundedSource<RabbitMqMessage,
RabbitMQCheckpointMark> {
+ final Read spec;
+
+ RabbitMQSource(Read spec) {
+ this.spec = spec;
+ }
+
+ @Override
+ public Coder<RabbitMqMessage> getOutputCoder() {
+ return SerializableCoder.of(RabbitMqMessage.class);
+ }
+
+ @Override
+ public List<RabbitMQSource> split(int desiredNumSplits, PipelineOptions
options) {
+ // RabbitMQ uses queue, so, we can have several concurrent consumers as
source
+ List<RabbitMQSource> sources = new ArrayList<>();
+ for (int i = 0; i < desiredNumSplits; i++) {
+ sources.add(this);
+ }
+ return sources;
+ }
+
+ @Override
+ public UnboundedReader<RabbitMqMessage> createReader(
+ PipelineOptions options, RabbitMQCheckpointMark checkpointMark) throws
IOException {
+ return new UnboundedRabbitMqReader(this, checkpointMark);
+ }
+
+ @Override
+ public Coder<RabbitMQCheckpointMark> getCheckpointMarkCoder() {
+ return SerializableCoder.of(RabbitMQCheckpointMark.class);
+ }
+
+ @Override
+ public boolean requiresDeduping() {
+ return spec.useCorrelationId();
+ }
+ }
+
+ private static class RabbitMQCheckpointMark
+ implements UnboundedSource.CheckpointMark, Serializable {
+ transient Channel channel;
+ Instant oldestTimestamp;
+ final List<Long> sessionIds = new ArrayList<>();
+
+ @Override
+ public void finalizeCheckpoint() throws IOException {
+ for (Long sessionId : sessionIds) {
+ channel.basicAck(sessionId, false);
+ }
+ channel.txCommit();
+ oldestTimestamp = Instant.now();
+ sessionIds.clear();
+ }
+ }
+
+ private static class UnboundedRabbitMqReader
+ extends UnboundedSource.UnboundedReader<RabbitMqMessage> {
+ private final RabbitMQSource source;
+
+ private RabbitMqMessage current;
+ private byte[] currentRecordId;
+ private ConnectionHandler connectionHandler;
+ private QueueingConsumer consumer;
+ private Instant currentTimestamp;
+ private final RabbitMQCheckpointMark checkpointMark;
+
+ UnboundedRabbitMqReader(RabbitMQSource source, RabbitMQCheckpointMark
checkpointMark)
+ throws IOException {
+ this.source = source;
+ this.current = null;
+ this.checkpointMark = checkpointMark != null ? checkpointMark : new
RabbitMQCheckpointMark();
+ try {
+ connectionHandler = new ConnectionHandler(source.spec.uri());
+ } catch (Exception e) {
+ throw new IOException(e);
+ }
+ }
+
+ @Override
+ public Instant getWatermark() {
+ return checkpointMark.oldestTimestamp;
+ }
+
+ @Override
+ public UnboundedSource.CheckpointMark getCheckpointMark() {
+ return checkpointMark;
+ }
+
+ @Override
+ public RabbitMQSource getCurrentSource() {
+ return source;
+ }
+
+ @Override
+ public byte[] getCurrentRecordId() {
+ if (current == null) {
+ throw new NoSuchElementException();
+ }
+ if (currentRecordId != null) {
+ return currentRecordId;
+ } else {
+ return "".getBytes(StandardCharsets.UTF_8);
+ }
+ }
+
+ @Override
+ public Instant getCurrentTimestamp() {
+ if (currentTimestamp == null) {
+ throw new NoSuchElementException();
+ }
+ return currentTimestamp;
+ }
+
+ @Override
+ public RabbitMqMessage getCurrent() {
+ if (current == null) {
+ throw new NoSuchElementException();
+ }
+ return current;
+ }
+
+ @Override
+ public boolean start() throws IOException {
+ try {
+ ConnectionHandler connectionHandler = new
ConnectionHandler(source.spec.uri());
+ connectionHandler.start();
+
+ Channel channel = connectionHandler.getChannel();
+
+ String queueName = source.spec.queue();
+ if (source.spec.queueDeclare()) {
+ // declare the queue (if not done by another application)
+ // channel.queueDeclare(queueName, durable, exclusive, autoDelete,
arguments);
+ channel.queueDeclare(queueName, false, false, false, null);
+ }
+ if (source.spec.exchange() != null) {
+ channel.exchangeDeclare(source.spec.exchange(),
source.spec.exchangeType());
+ if (queueName == null) {
+ queueName = channel.queueDeclare().getQueue();
+ }
+ channel.queueBind(queueName, source.spec.exchange(),
source.spec.routingKey());
+ }
+ checkpointMark.channel = channel;
+ consumer = new QueueingConsumer(channel);
+ channel.txSelect();
+ // we consume message without autoAck (we want to do the ack ourselves)
+ channel.setDefaultConsumer(consumer);
+ channel.basicConsume(queueName, false, consumer);
+ } catch (Exception e) {
+ throw new IOException(e);
+ }
+ return advance();
+ }
+
+ @Override
+ public boolean advance() throws IOException {
+ try {
+ QueueingConsumer.Delivery delivery = consumer.nextDelivery();
+ if (source.spec.useCorrelationId()) {
+ String correlationId = delivery.getProperties().getCorrelationId();
+ if (correlationId == null) {
+ throw new IOException(
+ "RabbitMqIO.Read uses message correlation ID, but received "
+ + "message has a null correlation ID");
+ }
+ currentRecordId = correlationId.getBytes(StandardCharsets.UTF_8);
+ }
+ long deliveryTag = delivery.getEnvelope().getDeliveryTag();
+ checkpointMark.sessionIds.add(deliveryTag);
+
+ current =
+ new RabbitMqMessage(
+ source.spec.routingKey(),
+ delivery.getBody(),
Review comment:
Can you pass `delivery` itself to the constructor?
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Issue Time Tracking
-------------------
Worklog Id: (was: 125193)
Time Spent: 8h 50m (was: 8h 40m)
> Create RabbitMqIO
> -----------------
>
> Key: BEAM-1240
> URL: https://issues.apache.org/jira/browse/BEAM-1240
> Project: Beam
> Issue Type: New Feature
> Components: io-ideas
> Reporter: Jean-Baptiste Onofré
> Assignee: Jean-Baptiste Onofré
> Priority: Major
> Fix For: 2.6.0
>
> Time Spent: 8h 50m
> Remaining Estimate: 0h
>
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