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Support producer transactions (#18)
* save work on producer transactions * update code * save work * up coverage * update readme * update readme * update readme * udpate readme * update readme * update readme
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‎README.md

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@@ -19,6 +19,10 @@ can help out to understand the internals of this library.
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- ext-rdkafka: >=4.0.0
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- librdkafka: >=0.11.6 (if you use `<librdkafka:1.x` please define your own error callback)
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:warning: To use the transactional producer you'll need:
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- ext-rdkafka: >=4.1.0
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- librdkafka: >=1.4
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## Installation
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```
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composer require jobcloud/php-kafka-lib "~1.0"
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// Shutdown producer, flush messages that are in queue. Give up after 20s
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$result = $producer->flush(20000);
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```
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##### Transactional producer (needs >=php-rdkafka:4.1 and >=librdkafka:1.4)
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```php
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<?php
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use Jobcloud\Kafka\Message\KafkaProducerMessage;
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use Jobcloud\Kafka\Producer\KafkaProducerBuilder;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionRetryException;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionAbortException;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionFatalException;
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$producer = KafkaProducerBuilder::create()
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->withAdditionalBroker('localhost:9092')
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->build();
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$message = KafkaProducerMessage::create('test-topic', 0)
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->withKey('asdf-asdf-asfd-asdf')
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->withBody('some test message payload')
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->withHeaders([ 'key' => 'value' ]);
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try {
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$producer->beginTransaction(10000);
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$producer->produce($message);
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$producer->commitTransaction(10000);
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} catch (KafkaProducerTransactionRetryException $e) {
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// something went wrong but you can retry the failed call (either beginTransaction or commitTransaction)
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} catch (KafkaProducerTransactionAbortException $e) {
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// you need to call $producer->abortTransaction(10000); and try again
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} catch (KafkaProducerTransactionFatalException $e) {
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// something went very wrong, re-create your producer, otherwise you could jeopardize the idempotency guarantees
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}
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// Shutdown producer, flush messages that are in queue. Give up after 20s
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$result = $producer->flush(20000);
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```
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##### Avro Producer
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To create an avro prodcuer add the avro encoder.
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‎src/Exception/KafkaProducerTransactionAbortException.php

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<?php
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declare(strict_types=1);
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namespace Jobcloud\Kafka\Exception;
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class KafkaProducerTransactionAbortException extends \Exception
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{
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public const TRANSACTION_REQUIRES_ABORT_EXCEPTION_MESSAGE =
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'Produce failed. You need to abort your current transaction and start a new one';
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}

‎src/Exception/KafkaProducerTransactionFatalException.php

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<?php
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declare(strict_types=1);
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namespace Jobcloud\Kafka\Exception;
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class KafkaProducerTransactionFatalException extends \Exception
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{
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public const FATAL_TRANSACTION_EXCEPTION_MESSAGE =
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'Produce failed with a fatal error. This producer instance cannot be used anymore.';
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}

‎src/Exception/KafkaProducerTransactionRetryException.php

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<?php
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declare(strict_types=1);
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namespace Jobcloud\Kafka\Exception;
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class KafkaProducerTransactionRetryException extends \Exception
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{
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public const RETRIABLE_TRANSACTION_EXCEPTION_MESSAGE = 'Produce failed but can be retried';
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}

‎src/Producer/KafkaProducer.php

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namespace Jobcloud\Kafka\Producer;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionAbortException;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionFatalException;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionRetryException;
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use Jobcloud\Kafka\Message\KafkaProducerMessageInterface;
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use Jobcloud\Kafka\Message\Encoder\EncoderInterface;
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use Jobcloud\Kafka\Conf\KafkaConfiguration;
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use RdKafka\Producer as RdKafkaProducer;
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use RdKafka\ProducerTopic as RdKafkaProducerTopic;
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use RdKafka\Metadata\Topic as RdKafkaMetadataTopic;
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use RdKafka\Exception as RdKafkaException;
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use RdKafka\KafkaErrorException as RdKafkaErrorException;
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final class KafkaProducer implements KafkaProducerInterface
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{
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*/
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protected $encoder;
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/**
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* @var bool
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*/
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private $transactionInitialized = false;
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/**
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* KafkaProducer constructor.
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* @param RdKafkaProducer $producer
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->current();
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}
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/**
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* Start a producer transaction
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*
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* @param int $timeoutMs
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* @return void
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*
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* @throws KafkaProducerTransactionAbortException
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* @throws KafkaProducerTransactionFatalException
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* @throws KafkaProducerTransactionRetryException
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*/
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public function beginTransaction(int $timeoutMs): void
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{
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try {
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if (false === $this->transactionInitialized) {
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$this->producer->initTransactions($timeoutMs);
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$this->transactionInitialized = true;
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}
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$this->producer->beginTransaction();
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} catch (RdKafkaErrorException $e) {
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$this->handleTransactionError($e);
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}
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}
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/**
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* Commit the current producer transaction
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*
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* @param int $timeoutMs
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* @return void
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*
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* @throws KafkaProducerTransactionAbortException
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* @throws KafkaProducerTransactionFatalException
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* @throws KafkaProducerTransactionRetryException
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*/
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public function commitTransaction(int $timeoutMs): void
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{
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try {
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$this->producer->commitTransaction($timeoutMs);
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} catch (RdKafkaErrorException $e) {
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$this->handleTransactionError($e);
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}
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}
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/**
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* Abort the current producer transaction
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*
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* @param int $timeoutMs
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* @return void
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*
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* @throws KafkaProducerTransactionAbortException
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* @throws KafkaProducerTransactionFatalException
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* @throws KafkaProducerTransactionRetryException
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*/
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public function abortTransaction(int $timeoutMs): void
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{
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try {
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$this->producer->abortTransaction($timeoutMs);
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} catch (RdKafkaErrorException $e) {
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$this->handleTransactionError($e);
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}
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}
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/**
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* @param string $topic
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* @return RdKafkaProducerTopic
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return $this->producerTopics[$topic];
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}
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/**
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* @param RdKafkaErrorException $e
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*
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* @throws KafkaProducerTransactionAbortException
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* @throws KafkaProducerTransactionFatalException
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* @throws KafkaProducerTransactionRetryException
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*/
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private function handleTransactionError(RdKafkaErrorException $e): void
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{
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if (true === $e->isRetriable()) {
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throw new KafkaProducerTransactionRetryException(
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KafkaProducerTransactionRetryException::RETRIABLE_TRANSACTION_EXCEPTION_MESSAGE
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);
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} elseif (true === $e->transactionRequiresAbort()) {
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throw new KafkaProducerTransactionAbortException(
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KafkaProducerTransactionAbortException::TRANSACTION_REQUIRES_ABORT_EXCEPTION_MESSAGE
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);
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} else {
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$this->transactionInitialized = false;
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// according to librdkafka documentation, everything that is not retriable, abortable or fatal is fatal
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// fatal errors (so stated), need the producer to be destroyed
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throw new KafkaProducerTransactionFatalException(
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KafkaProducerTransactionFatalException::FATAL_TRANSACTION_EXCEPTION_MESSAGE
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);
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}
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}
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}

‎src/Producer/KafkaProducerInterface.php

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namespace Jobcloud\Kafka\Producer;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionAbortException;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionFatalException;
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use Jobcloud\Kafka\Exception\KafkaProducerTransactionRetryException;
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use Jobcloud\Kafka\Message\KafkaProducerMessageInterface;
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use RdKafka\Metadata\Topic as RdKafkaMetadataTopic;
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* @return RdKafkaMetadataTopic
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*/
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public function getMetadataForTopic(string $topicName, int $timeoutMs = 10000): RdKafkaMetadataTopic;
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/**
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* Start a producer transaction
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*
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* @param int $timeoutMs
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* @return void
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*
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* @throws KafkaProducerTransactionAbortException
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* @throws KafkaProducerTransactionFatalException
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* @throws KafkaProducerTransactionRetryException
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*/
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public function beginTransaction(int $timeoutMs): void;
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/**
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* Commit the current producer transaction
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*
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* @param int $timeoutMs
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* @return void
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*
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* @throws KafkaProducerTransactionAbortException
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* @throws KafkaProducerTransactionFatalException
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* @throws KafkaProducerTransactionRetryException
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*/
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public function commitTransaction(int $timeoutMs): void;
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/**
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* Abort the current producer transaction
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*
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* @param int $timeoutMs
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* @return void
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*
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* @throws KafkaProducerTransactionAbortException
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* @throws KafkaProducerTransactionFatalException
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* @throws KafkaProducerTransactionRetryException
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*/
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public function abortTransaction(int $timeoutMs): void;
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}

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