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<?php |
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/** |
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* Licensed to CRATE Technology GmbH("Crate") under one or more contributor |
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* license agreements. See the NOTICE file distributed with this work for |
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* additional information regarding copyright ownership. Crate licenses |
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* this file to you 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. You may |
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* 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, WITHOUT |
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
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* License for the specific language governing permissions and limitations |
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* under the License. |
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* |
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* However, if you have executed another commercial license agreement |
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* with Crate these terms will supersede the license and you may use the |
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* software solely pursuant to the terms of the relevant commercial agreement. |
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*/ |
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namespace Crate\PDO\Http; |
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use Crate\PDO\Exception\RuntimeException; |
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use Crate\PDO\Exception\UnsupportedException; |
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use Crate\Stdlib\Collection; |
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use GuzzleHttp\Exception\BadResponseException; |
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use GuzzleHttp\Exception\ConnectException; |
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use GuzzleHttp\Exception\ParseException; |
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class Client implements ClientInterface |
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{ |
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const DEFAULT_SERVER = "localhost:4200"; |
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/** |
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* @var array |
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*/ |
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private $availableServers = []; |
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/** |
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* @var array |
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*/ |
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private $serverPool = []; |
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/** |
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* Client constructor. |
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* @param array $servers |
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* @param array $options |
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*/ |
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public function __construct(array $servers, array $options) |
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{ |
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if ($servers == null || count($servers) == 0) { |
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$this->serverPool[self::DEFAULT_SERVER] = new Server(self::DEFAULT_SERVER, $options); |
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$this->availableServers[] = self::DEFAULT_SERVER; |
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} else { |
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foreach ($servers as &$server) { |
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$this->serverPool[$server] = new Server($server, $options); |
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$this->availableServers[] = $server; |
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} |
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} |
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} |
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/** |
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* {@Inheritdoc} |
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*/ |
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public function execute($query, array $parameters) |
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{ |
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$body = [ |
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'stmt' => $query, |
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'args' => $parameters |
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]; |
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while (true) { |
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$nextServer = $this->nextServer(); |
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/** |
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* @var Server $s |
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*/ |
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$s = $this->serverPool[$nextServer]; |
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try { |
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$response = $s->doRequest($body); |
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$responseBody = $response->json(); |
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return new Collection( |
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$responseBody['rows'], |
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$responseBody['cols'], |
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$responseBody['duration'], |
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$responseBody['rowcount'] |
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); |
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} catch (ConnectException $exception) { |
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// drop the server from the list of available servers |
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$this->dropServer($nextServer); |
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// break the loop if no more servers are available |
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$this->raiseIfNoMoreServers($exception); |
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} catch (BadResponseException $exception) { |
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try { |
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$json = $exception->getResponse()->json(); |
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$errorCode = $json['error']['code']; |
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$errorMessage = $json['error']['message']; |
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throw new RuntimeException($errorMessage, $errorCode, $exception); |
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} catch (ParseException $e) { |
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throw new RuntimeException('Server returned non-JSON response.', 0, $exception); |
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} |
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} |
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} |
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return null; |
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} |
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/** |
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* {@Inheritdoc} |
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*/ |
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public function getServerInfo() |
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{ |
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throw new UnsupportedException('Not yet implemented'); |
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} |
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/** |
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* {@Inheritdoc} |
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*/ |
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public function getServerVersion() |
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{ |
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throw new UnsupportedException('Not yet implemented'); |
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} |
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/** |
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* {@Inheritdoc} |
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*/ |
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public function setTimeout($timeout) |
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{ |
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foreach ($this->serverPool as $k => &$s) { |
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/** |
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* @var $s Server |
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*/ |
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$s->setTimeout($timeout); |
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} |
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} |
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/** |
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* {@Inheritdoc} |
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*/ |
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public function setHttpBasicAuth($username, $passwd) |
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{ |
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foreach ($this->serverPool as $k => &$s) { |
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/** |
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* @var $s Server |
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*/ |
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$s->setHttpBasicAuth($username, $passwd); |
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} |
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} |
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/** |
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* {@Inheritdoc} |
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*/ |
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public function setHttpHeader($name, $value) |
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{ |
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foreach ($this->serverPool as $k => &$s) { |
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/** |
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* @var $s Server |
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*/ |
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$s->setHttpHeader($name, $value); |
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} |
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} |
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/** |
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* @return string The next available server instance |
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*/ |
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private function nextServer() |
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{ |
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$server = $this->availableServers[0]; |
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$this->roundRobin(); |
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return $server; |
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} |
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/** |
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* Very simple round-robin implementation |
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* Pops the first item of the availableServers array and appends it at the end. |
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* |
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* @return void |
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*/ |
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private function roundRobin() |
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{ |
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/** |
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* Performing round robin on the array only makes sense |
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* if there are more than 1 available servers. |
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*/ |
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if (count($this->availableServers) > 1) { |
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$this->availableServers[] = array_shift($this->availableServers); |
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} |
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} |
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/** |
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* @param string $server |
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*/ |
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private function dropServer($server) |
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{ |
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if (($idx = array_search($server, $this->availableServers)) !== false) { |
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unset($this->availableServers[$idx]); |
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} |
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} |
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/** |
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* @param ConnectException $exception |
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*/ |
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private function raiseIfNoMoreServers($exception) |
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{ |
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if (count($this->availableServers) == 0) { |
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throw new ConnectException("No more servers available, exception from last server: " . $exception->getMessage(), |
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$exception->getRequest(), $exception->getResponse(), $exception); |
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} |
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} |
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} |
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crate /
crate-pdo
