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<?php |
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/** |
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* Copyright 2014 SURFnet bv |
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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 Surfnet\StepupMiddlewareClient\Service; |
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use GuzzleHttp\ClientInterface; |
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use RuntimeException; |
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use Surfnet\StepupMiddlewareClient\Exception\CommandExecutionFailedException; |
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use Surfnet\StepupMiddlewareClient\Exception\InvalidArgumentException; |
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class CommandService |
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{ |
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/** |
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* @var ClientInterface |
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*/ |
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private $guzzleClient; |
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/** |
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* @var string |
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*/ |
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private $username; |
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/** |
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* @var string |
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*/ |
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private $password; |
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/** |
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* @param ClientInterface $guzzleClient A Guzzle client preconfigured with the command URL. |
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* @param string $username |
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* @param string $password |
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*/ |
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public function __construct(ClientInterface $guzzleClient, $username, $password) |
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{ |
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if (!is_string($username)) { |
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throw InvalidArgumentException::invalidType('string', 'username', $username); |
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} |
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if (!is_string($password)) { |
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throw InvalidArgumentException::invalidType('string', 'password', $password); |
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} |
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$this->guzzleClient = $guzzleClient; |
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$this->username = $username; |
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$this->password = $password; |
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} |
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/** |
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* @param string $commandName |
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* @param string $uuid |
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* @param array $payload |
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* @param array $metadata |
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* @return ExecutionResult |
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* @throws CommandExecutionFailedException |
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*/ |
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public function execute($commandName, $uuid, array $payload, array $metadata = []) |
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{ |
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$this->assertIsValidCommandName($commandName); |
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if (!is_string($uuid)) { |
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throw InvalidArgumentException::invalidType('string', 'uuid', $uuid); |
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} |
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$command = [ |
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'name' => $commandName, |
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'uuid' => $uuid, |
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'payload' => $payload, |
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]; |
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$body = ['command' => $command]; |
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if (count($metadata) > 0) { |
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$body['meta'] = $metadata; |
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} |
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$requestOptions = [ |
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'json' => $body, |
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'exceptions' => false, |
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'auth' => [$this->username, $this->password, 'basic'], |
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'headers' => ['Accept' => 'application/json'], |
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]; |
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$httpResponse = $this->guzzleClient->post(null, $requestOptions); |
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try { |
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$response = $httpResponse->json(); |
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} catch (RuntimeException $e) { |
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throw new CommandExecutionFailedException( |
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'Server response could not be decoded as it isn\'t valid JSON.', |
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0, |
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$e |
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); |
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} |
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return $httpResponse->getStatusCode() == 200 |
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? $this->processOkResponse($uuid, $response) |
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: $this->processErrorResponse($uuid, $response); |
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} |
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/** |
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* @param mixed $commandName |
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* @throws InvalidArgumentException |
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*/ |
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private function assertIsValidCommandName($commandName) |
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{ |
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if (!is_string($commandName)) { |
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InvalidArgumentException::invalidType('string', 'command', $commandName); |
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} |
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if (!preg_match('~^[a-z0-9_]+:([a-z0-9_].)*[a-z0-9_]+$~i', $commandName)) { |
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throw new InvalidArgumentException( |
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'Command must be formatted AggregateRoot:Command or AggregateRoot:Name.Space.Command' |
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); |
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} |
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} |
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/** |
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* @param string $uuid |
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* @param mixed $response |
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* @return ExecutionResult |
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*/ |
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private function processOkResponse($uuid, $response) |
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{ |
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if (!isset($response['command'])) { |
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throw new CommandExecutionFailedException('Unexpected response format: command key missing.'); |
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} |
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if ($response['command'] !== $uuid) { |
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throw new CommandExecutionFailedException(sprintf( |
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'Unexpected response: returned command UUID "%s" does not match sent UUID "%s".', |
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$response['command'], |
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$uuid |
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)); |
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} |
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if (!isset($response['processed_by'])) { |
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throw new CommandExecutionFailedException('Unexpected response format: processed_by key missing.'); |
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} |
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if (!is_string($response['processed_by'])) { |
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throw new CommandExecutionFailedException(sprintf( |
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'Unexpected response format: processed_by should be a string, "%s" given.', |
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gettype($response['processed_by']) |
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)); |
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} |
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return new ExecutionResult($uuid, $response['processed_by']); |
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} |
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/** |
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* @param string $uuid |
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* @param mixed $response |
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* @return ExecutionResult |
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*/ |
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private function processErrorResponse($uuid, $response) |
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{ |
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if (!isset($response['errors'])) { |
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throw new CommandExecutionFailedException('Unexpected response format: errors key missing.'); |
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} |
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if (!is_array($response['errors'])) { |
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throw new CommandExecutionFailedException(sprintf( |
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'Unexpected response format: errors should be an array, "%s" given.', |
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gettype($response['errors']) |
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)); |
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} |
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return new ExecutionResult($uuid, null, $response['errors']); |
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} |
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} |
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