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add metricspoller(phystrix-dashboard)
- add badges - fix phystrix-dashboard errors - add apcu libraries - RequestCache support PSR-16 - default command key format changed. App\Phystrix\DummyCommand => App.Phystrix.DummyCommand
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,157 @@ | ||
| <?php | ||
| /** | ||
| * This file is a part of the Phystrix library | ||
| * | ||
| * Copyright 2013-2014 oDesk Corporation. All Rights Reserved. | ||
| * | ||
| * This file is licensed 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. | ||
| */ | ||
| namespace Odesk\Phystrix; | ||
|
|
||
| /** | ||
| * APCU cache driven storage for Circuit Breaker metrics statistics | ||
| */ | ||
| class ApcuStateStorage implements StateStorageInterface | ||
| { | ||
| const BUCKET_EXPIRE_SECONDS = 120; | ||
|
|
||
| const CACHE_PREFIX = 'phystrix_cb_'; | ||
|
|
||
| const OPENED_NAME = 'opened'; | ||
|
|
||
| const SINGLE_TEST_BLOCKED = 'single_test_blocked'; | ||
|
|
||
| /** | ||
| * Constructor | ||
| * @throws Exception\ApcNotLoadedException | ||
| */ | ||
| public function __construct() | ||
| { | ||
| if (!extension_loaded('apcu')) { | ||
| throw new Exception\ApcNotLoadedException('"apcu" PHP extension is required for Phystrix to work'); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Prepends cache prefix and filters out invalid characters | ||
| * | ||
| * @param string $name | ||
| * @return string | ||
| */ | ||
| protected function prefix($name) | ||
| { | ||
| return self::CACHE_PREFIX . $name; | ||
| } | ||
|
|
||
| /** | ||
| * Returns counter value for the given bucket | ||
| * | ||
| * @param string $commandKey | ||
| * @param string $type | ||
| * @param integer $index | ||
| * @return integer | ||
| */ | ||
| public function getBucket($commandKey, $type, $index) | ||
| { | ||
| $bucketName = $this->prefix($commandKey . '_' . $type . '_' . $index); | ||
| return apcu_fetch($bucketName); | ||
| } | ||
|
|
||
| /** | ||
| * Increments counter value for the given bucket | ||
| * | ||
| * @param string $commandKey | ||
| * @param string $type | ||
| * @param integer $index | ||
| */ | ||
| public function incrementBucket($commandKey, $type, $index) | ||
| { | ||
| $bucketName = $this->prefix($commandKey . '_' . $type . '_' . $index); | ||
| if (!apcu_add($bucketName, 1, self::BUCKET_EXPIRE_SECONDS)) { | ||
| apcu_inc($bucketName); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * If the given bucket is found, sets counter value to 0. | ||
| * | ||
| * @param string $commandKey Circuit breaker key | ||
| * @param string $type | ||
| * @param integer $index | ||
| */ | ||
| public function resetBucket($commandKey, $type, $index) | ||
| { | ||
| $bucketName = $this->prefix($commandKey . '_' . $type . '_' . $index); | ||
| if (apcu_exists($bucketName)) { | ||
| apcu_store($bucketName, 0, self::BUCKET_EXPIRE_SECONDS); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Marks the given circuit as open | ||
| * | ||
| * @param string $commandKey Circuit key | ||
| * @param integer $sleepingWindowInMilliseconds In how much time we should allow a single test | ||
| */ | ||
| public function openCircuit($commandKey, $sleepingWindowInMilliseconds) | ||
| { | ||
| $openedKey = $this->prefix($commandKey . self::OPENED_NAME); | ||
| $singleTestFlagKey = $this->prefix($commandKey . self::SINGLE_TEST_BLOCKED); | ||
|
|
||
| apcu_store($openedKey, true); | ||
| // the single test blocked flag will expire automatically in $sleepingWindowInMilliseconds | ||
| // thus allowing us a single test. Notice, APC doesn't allow us to use | ||
| // expire time less than a second. | ||
| $sleepingWindowInSeconds = ceil($sleepingWindowInMilliseconds / 1000); | ||
| apcu_add($singleTestFlagKey, true, $sleepingWindowInSeconds); | ||
| } | ||
|
|
||
| /** | ||
| * Whether a single test is allowed | ||
| * | ||
| * @param string $commandKey Circuit breaker key | ||
| * @param integer $sleepingWindowInMilliseconds In how much time we should allow the next single test | ||
| * @return boolean | ||
| */ | ||
| public function allowSingleTest($commandKey, $sleepingWindowInMilliseconds) | ||
| { | ||
| $singleTestFlagKey = $this->prefix($commandKey . self::SINGLE_TEST_BLOCKED); | ||
| // using 'add' enforces thread safety. | ||
| $sleepingWindowInSeconds = ceil($sleepingWindowInMilliseconds / 1000); | ||
| // another APCU limitation is that within the current request variables will never expire. | ||
| return (boolean) apcu_add($singleTestFlagKey, true, $sleepingWindowInSeconds); | ||
| } | ||
|
|
||
| /** | ||
| * Whether a circuit is open | ||
| * | ||
| * @param string $commandKey Circuit breaker key | ||
| * @return boolean | ||
| */ | ||
| public function isCircuitOpen($commandKey) | ||
| { | ||
| $openedKey = $this->prefix($commandKey . self::OPENED_NAME); | ||
| return (boolean) apcu_fetch($openedKey); | ||
| } | ||
|
|
||
| /** | ||
| * Marks the given circuit as closed | ||
| * | ||
| * @param string $commandKey Circuit key | ||
| */ | ||
| public function closeCircuit($commandKey) | ||
| { | ||
| $openedKey = $this->prefix($commandKey . self::OPENED_NAME); | ||
| apcu_store($openedKey, false); | ||
| } | ||
| } |
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