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<?php
namespace Wikimedia\Tests\ObjectCache;
use MediaWikiUnitTestCase;
use ReplicatedBagOStuff;
use Wikimedia\LightweightObjectStore\StorageAwareness;
use Wikimedia\ObjectCache\HashBagOStuff;
use Wikimedia\TestingAccessWrapper;
/**
* @covers \ReplicatedBagOStuff
*/
class ReplicatedBagOStuffTest extends MediaWikiUnitTestCase {
/** @var HashBagOStuff */
private $writeCache;
/** @var HashBagOStuff */
private $readCache;
/** @var ReplicatedBagOStuff */
private $cache;
protected function setUp(): void {
parent::setUp();
$this->writeCache = new HashBagOStuff();
$this->readCache = new HashBagOStuff();
$this->cache = new ReplicatedBagOStuff( [
'keyspace' => 'repl_local',
'writeFactory' => $this->writeCache,
'readFactory' => $this->readCache,
] );
}
public function testSet() {
$key = $this->cache->makeKey( 'a', 'key' );
$value = 'a value';
$this->cache->set( $key, $value );
$this->assertSame( $value, $this->writeCache->get( $key ), 'Written' );
$this->assertFalse( $this->readCache->get( $key ), 'Async replication' );
}
public function testGet() {
$key = $this->cache->makeKey( 'a', 'key' );
$write = 'new value';
$this->writeCache->set( $key, $write );
$read = 'old value';
$this->readCache->set( $key, $read );
$this->assertSame( $read, $this->cache->get( $key ), 'Async replication' );
}
public function testGetAbsent() {
$key = $this->cache->makeKey( 'a', 'key' );
$value = 'a value';
$this->writeCache->set( $key, $value );
$this->assertFalse( $this->cache->get( $key ), 'Async replication' );
}
public function testGetSetMulti() {
$keyA = $this->cache->makeKey( 'key', 'a' );
$keyB = $this->cache->makeKey( 'key', 'b' );
$valueAOld = 'one old value';
$valueBOld = 'another old value';
$valueANew = 'one new value';
$valueBNew = 'another new value';
$this->writeCache->setMulti( [ $keyA => $valueANew, $keyB => $valueBNew ] );
$this->readCache->setMulti( [ $keyA => $valueAOld, $keyB => $valueBOld ] );
$this->assertEquals(
[ $keyA => $valueAOld, $keyB => $valueBOld ],
$this->cache->getMulti( [ $keyA, $keyB ] ),
'Async replication'
);
}
public function testGetSetRaw() {
$key = 'a:key';
$value = 'a value';
$this->cache->set( $key, $value );
// Write to master.
$this->assertEquals( $value, $this->writeCache->get( $key ) );
// Don't write to replica. Replication is deferred to backend.
$this->assertFalse( $this->readCache->get( $key ) );
}
public function testErrorHandling() {
$wCache = $this->createPartialMock( HashBagOStuff::class, [ 'set' ] );
$wCacheWrapper = TestingAccessWrapper::newFromObject( $wCache );
$wCacheNextError = StorageAwareness::ERR_NONE;
$wCache->method( 'set' )
->willReturnCallback( static function () use ( $wCacheWrapper, &$wCacheNextError ) {
if ( $wCacheNextError !== StorageAwareness::ERR_NONE ) {
$wCacheWrapper->setLastError( $wCacheNextError );
return false;
}
return true;
} );
$rCache = $this->createPartialMock( HashBagOStuff::class, [ 'get' ] );
$rCacheWrapper = TestingAccessWrapper::newFromObject( $rCache );
$rCacheNextError = StorageAwareness::ERR_NONE;
$rCache->method( 'get' )
->willReturnCallback( static function () use ( $rCacheWrapper, &$rCacheNextError ) {
if ( $rCacheNextError !== StorageAwareness::ERR_NONE ) {
$rCacheWrapper->setLastError( $rCacheNextError );
}
return false;
} );
$cache = new ReplicatedBagOStuff( [
'keyspace' => 'repl_local',
'writeFactory' => $wCache,
'readFactory' => $rCache,
] );
$cacheWrapper = TestingAccessWrapper::newFromObject( $cache );
$key1 = 'a:key';
$wp1 = $cache->watchErrors();
$cache->get( $key1 );
$this->assertSame( StorageAwareness::ERR_NONE, $rCache->getLastError() );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError() );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError( $wp1 ) );
$cache->set( $key1, 'value', 3600 );
$this->assertSame( StorageAwareness::ERR_NONE, $wCache->getLastError() );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError() );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError( $wp1 ) );
// Use a different key to avoid the "sessionConsistencyWindow" configuration
$key2 = 'b:key';
$wCacheNextError = StorageAwareness::ERR_NO_RESPONSE;
$rCacheNextError = StorageAwareness::ERR_UNREACHABLE;
$cache->get( $key2 );
$this->assertSame( $rCacheNextError, $rCache->getLastError() );
$this->assertSame( $rCacheNextError, $cache->getLastError() );
$wp2 = $cache->watchErrors();
$cache->set( $key2, 'value', 3600 );
$wp3 = $cache->watchErrors();
$this->assertSame( $wCacheNextError, $wCache->getLastError() );
$this->assertSame( $wCacheNextError, $cache->getLastError() );
$this->assertSame( $wCacheNextError, $cache->getLastError( $wp1 ) );
$this->assertSame( $wCacheNextError, $cache->getLastError( $wp2 ) );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError( $wp3 ) );
$cacheWrapper->setLastError( StorageAwareness::ERR_UNEXPECTED );
$wp4 = $cache->watchErrors();
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError() );
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError( $wp1 ) );
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError( $wp2 ) );
$this->assertSame( StorageAwareness::ERR_UNEXPECTED, $cache->getLastError( $wp3 ) );
$this->assertSame( StorageAwareness::ERR_NONE, $cache->getLastError( $wp4 ) );
$this->assertSame( $wCacheNextError, $wCache->getLastError() );
$this->assertSame( $rCacheNextError, $rCache->getLastError() );
}
}
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