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<?php |
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/** |
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* Copyright Aleksandar Panic |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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**/ |
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namespace ArekX\DataStreamer; |
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use ArekX\DataStreamer\Contracts\Driver; |
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use ArekX\DataStreamer\Contracts\FailHandler; |
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use ArekX\DataStreamer\Contracts\MessageHandler; |
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use ArekX\DataStreamer\Contracts\MessageParser; |
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use ArekX\DataStreamer\Contracts\StreamSettings; |
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class StreamReader |
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{ |
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protected Driver $driver; |
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protected MessageParser $parser; |
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protected MessageHandler $handler; |
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protected StreamSettings $settings; |
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protected ?FailHandler $failHandler = null; |
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protected $readFrom = Driver::FROM_START; |
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protected $failedMessages = []; |
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public function __construct( |
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Driver $driver, |
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MessageParser $parser, |
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MessageHandler $handler, |
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StreamSettings $settings, |
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FailHandler $failHandler = null |
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) |
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{ |
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$this->driver = $driver; |
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$this->parser = $parser; |
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$this->handler = $handler; |
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$this->settings = $settings; |
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$this->failHandler = $failHandler; |
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} |
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/** |
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* @codeCoverageIgnore |
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*/ |
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public function runLoop() |
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{ |
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$this->initializeStream(); |
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while (true) { |
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$this->processPendingMessages(); |
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} |
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} |
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public function getReadFrom(): string |
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{ |
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return $this->readFrom; |
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} |
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public function processPendingMessages() |
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{ |
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$this->failedMessages = []; |
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$messages = $this->readMessages(); |
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if (empty($messages)) { |
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if ($this->readFrom === Driver::FROM_START) { |
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$this->readFrom = Driver::FROM_LATEST; |
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} |
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return; |
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} |
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$handledIds = []; |
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foreach ($messages as $id => $rawMessage) { |
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if ($this->processMessage($id, $rawMessage)) { |
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$handledIds[] = $id; |
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} |
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} |
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$this->driver->acknowledge( |
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$this->settings->getStreamName(), |
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$this->settings->getConsumerGroup(), |
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$handledIds |
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); |
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if ($this->failHandler && !empty($this->failedMessages)) { |
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$this->failHandler->handle($this->failedMessages); |
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} |
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} |
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protected function processMessage($id, $rawMessage): bool |
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{ |
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try { |
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$this->handler->handle($this->parser->parse($id, $rawMessage)); |
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return true; |
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} catch (\Exception $e) { |
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if ($this->failHandler) { |
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$this->pushErrorMessage($id, $rawMessage, $e); |
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return false; |
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} |
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throw $e; |
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} |
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} |
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protected function pushErrorMessage($id, $rawMessage, ?\Exception $exception = null) |
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{ |
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$this->failedMessages[] = [ |
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'id' => $id, |
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'raw' => $rawMessage, |
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'error' => $exception |
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]; |
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} |
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protected function readMessages(): array |
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{ |
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return $this->driver->readMessages( |
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$this->settings->getConsumerGroup(), |
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$this->settings->getConsumerName(), |
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$this->settings->getStreamName(), |
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$this->readFrom, |
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$this->settings->getMessageReadCount(), |
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$this->settings->getMessageWaitTimeout() |
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); |
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} |
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4 |
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public function initializeStream(): void |
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{ |
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$this->driver->createGroup($this->settings->getStreamName(), $this->settings->getConsumerGroup()); |
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} |
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} |
ArekX /
php-data-streamer
