tests/phpunit/includes/libs/objectcache/BagOStuffTest.php

   1 <?php
   2 /**
   3  * @author Matthias Mullie <mmullie@wikimedia.org>
   4  * @group BagOStuff
   5  */
   6 class BagOStuffTest extends MediaWikiTestCase {
   7         /** @var BagOStuff */
   8         private $cache;
   9
  10         protected function setUp() {
  11                 parent::setUp();
  12
  13                 // type defined through parameter
  14                 if ( $this->getCliArg( 'use-bagostuff' ) ) {
  15                         $name = $this->getCliArg( 'use-bagostuff' );
  16
  17                         $this->cache = ObjectCache::newFromId( $name );
  18                 } else {
  19                         // no type defined - use simple hash
  20                         $this->cache = new HashBagOStuff;
  21                 }
  22
  23                 $this->cache->delete( wfMemcKey( 'test' ) );
  24         }
  25
  26         /**
  27          * @covers BagOStuff::makeGlobalKey
  28          * @covers BagOStuff::makeKeyInternal
  29          */
  30         public function testMakeKey() {
  31                 $cache = ObjectCache::newFromId( 'hash' );
  32
  33                 $localKey = $cache->makeKey( 'first', 'second', 'third' );
  34                 $globalKey = $cache->makeGlobalKey( 'first', 'second', 'third' );
  35
  36                 $this->assertStringMatchesFormat(
  37                         '%Sfirst%Ssecond%Sthird%S',
  38                         $localKey,
  39                         'Local key interpolates parameters'
  40                 );
  41
  42                 $this->assertStringMatchesFormat(
  43                         'global%Sfirst%Ssecond%Sthird%S',
  44                         $globalKey,
  45                         'Global key interpolates parameters and contains global prefix'
  46                 );
  47
  48                 $this->assertNotEquals(
  49                         $localKey,
  50                         $globalKey,
  51                         'Local key and global key with same parameters should not be equal'
  52                 );
  53
  54                 $this->assertNotEquals(
  55                         $cache->makeKeyInternal( 'prefix', array( 'a', 'bc:', 'de' ) ),
  56                         $cache->makeKeyInternal( 'prefix', array( 'a', 'bc', ':de' ) )
  57                 );
  58         }
  59
  60         /**
  61          * @covers BagOStuff::merge
  62          * @covers BagOStuff::mergeViaLock
  63          */
  64         public function testMerge() {
  65                 $key = wfMemcKey( 'test' );
  66
  67                 $usleep = 0;
  68
  69                 /**
  70                  * Callback method: append "merged" to whatever is in cache.
  71                  *
  72                  * @param BagOStuff $cache
  73                  * @param string $key
  74                  * @param int $existingValue
  75                  * @use int $usleep
  76                  * @return int
  77                  */
  78                 $callback = function ( BagOStuff $cache, $key, $existingValue ) use ( &$usleep ) {
  79                         // let's pretend this is an expensive callback to test concurrent merge attempts
  80                         usleep( $usleep );
  81
  82                         if ( $existingValue === false ) {
  83                                 return 'merged';
  84                         }
  85
  86                         return $existingValue . 'merged';
  87                 };
  88
  89                 // merge on non-existing value
  90                 $merged = $this->cache->merge( $key, $callback, 0 );
  91                 $this->assertTrue( $merged );
  92                 $this->assertEquals( $this->cache->get( $key ), 'merged' );
  93
  94                 // merge on existing value
  95                 $merged = $this->cache->merge( $key, $callback, 0 );
  96                 $this->assertTrue( $merged );
  97                 $this->assertEquals( $this->cache->get( $key ), 'mergedmerged' );
  98
  99                 /*
 100                  * Test concurrent merges by forking this process, if:
 101                  * - not manually called with --use-bagostuff
 102                  * - pcntl_fork is supported by the system
 103                  * - cache type will correctly support calls over forks
 104                  */
 105                 $fork = (bool)$this->getCliArg( 'use-bagostuff' );
 106                 $fork &= function_exists( 'pcntl_fork' );
 107                 $fork &= !$this->cache instanceof HashBagOStuff;
 108                 $fork &= !$this->cache instanceof EmptyBagOStuff;
 109                 $fork &= !$this->cache instanceof MultiWriteBagOStuff;
 110                 if ( $fork ) {
 111                         // callback should take awhile now so that we can test concurrent merge attempts
 112                         $pid = pcntl_fork();
 113                         if ( $pid == -1 ) {
 114                                 // can't fork, ignore this test...
 115                         } elseif ( $pid ) {
 116                                 // wait a little, making sure that the child process is calling merge
 117                                 usleep( 3000 );
 118
 119                                 // attempt a merge - this should fail
 120                                 $merged = $this->cache->merge( $key, $callback, 0, 1 );
 121
 122                                 // merge has failed because child process was merging (and we only attempted once)
 123                                 $this->assertFalse( $merged );
 124
 125                                 // make sure the child's merge is completed and verify
 126                                 usleep( 3000 );
 127                                 $this->assertEquals( $this->cache->get( $key ), 'mergedmergedmerged' );
 128                         } else {
 129                                 $this->cache->merge( $key, $callback, 0, 1 );
 130
 131                                 // Note: I'm not even going to check if the merge worked, I'll
 132                                 // compare values in the parent process to test if this merge worked.
 133                                 // I'm just going to exit this child process, since I don't want the
 134                                 // child to output any test results (would be rather confusing to
 135                                 // have test output twice)
 136                                 exit;
 137                         }
 138                 }
 139         }
 140
 141         /**
 142          * @covers BagOStuff::add
 143          */
 144         public function testAdd() {
 145                 $key = wfMemcKey( 'test' );
 146                 $this->assertTrue( $this->cache->add( $key, 'test' ) );
 147         }
 148
 149         public function testGet() {
 150                 $value = array( 'this' => 'is', 'a' => 'test' );
 151
 152                 $key = wfMemcKey( 'test' );
 153                 $this->cache->add( $key, $value );
 154                 $this->assertEquals( $this->cache->get( $key ), $value );
 155         }
 156
 157         /**
 158          * @covers BagOStuff::getWithSetCallback
 159          */
 160         public function testGetWithSetCallback() {
 161                 $key = wfMemcKey( 'test' );
 162                 $value = $this->cache->getWithSetCallback(
 163                         $key,
 164                         30,
 165                         function () {
 166                                 return 'hello kitty';
 167                         }
 168                 );
 169
 170                 $this->assertEquals( 'hello kitty', $value );
 171                 $this->assertEquals( $value, $this->cache->get( $key ) );
 172         }
 173
 174         /**
 175          * @covers BagOStuff::incr
 176          */
 177         public function testIncr() {
 178                 $key = wfMemcKey( 'test' );
 179                 $this->cache->add( $key, 0 );
 180                 $this->cache->incr( $key );
 181                 $expectedValue = 1;
 182                 $actualValue = $this->cache->get( $key );
 183                 $this->assertEquals( $expectedValue, $actualValue, 'Value should be 1 after incrementing' );
 184         }
 185
 186         /**
 187          * @covers BagOStuff::getMulti
 188          */
 189         public function testGetMulti() {
 190                 $value1 = array( 'this' => 'is', 'a' => 'test' );
 191                 $value2 = array( 'this' => 'is', 'another' => 'test' );
 192                 $value3 = array( 'testing a key that may be encoded when sent to cache backend' );
 193                 $value4 = array( 'another test where chars in key will be encoded' );
 194
 195                 $key1 = wfMemcKey( 'test1' );
 196                 $key2 = wfMemcKey( 'test2' );
 197                 // internally, MemcachedBagOStuffs will encode to will-%25-encode
 198                 $key3 = wfMemcKey( 'will-%-encode' );
 199                 $key4 = wfMemcKey(
 200                         'flowdb:flow_ref:wiki:by-source:v3:Parser\'s_"broken"_+_(page)_&_grill:testwiki:1:4.7'
 201                 );
 202
 203                 $this->cache->add( $key1, $value1 );
 204                 $this->cache->add( $key2, $value2 );
 205                 $this->cache->add( $key3, $value3 );
 206                 $this->cache->add( $key4, $value4 );
 207
 208                 $this->assertEquals(
 209                         array( $key1 => $value1, $key2 => $value2, $key3 => $value3, $key4 => $value4 ),
 210                         $this->cache->getMulti( array( $key1, $key2, $key3, $key4 ) )
 211                 );
 212
 213                 // cleanup
 214                 $this->cache->delete( $key1 );
 215                 $this->cache->delete( $key2 );
 216                 $this->cache->delete( $key3 );
 217                 $this->cache->delete( $key4 );
 218         }
 219
 220         /**
 221          * @covers BagOStuff::getScopedLock
 222          */
 223         public function testGetScopedLock() {
 224                 $key = wfMemcKey( 'test' );
 225                 $value1 = $this->cache->getScopedLock( $key, 0 );
 226                 $value2 = $this->cache->getScopedLock( $key, 0 );
 227
 228                 $this->assertType( 'ScopedCallback', $value1, 'First call returned lock' );
 229                 $this->assertNull( $value2, 'Duplicate call returned no lock' );
 230
 231                 unset( $value1 );
 232
 233                 $value3 = $this->cache->getScopedLock( $key, 0 );
 234                 $this->assertType( 'ScopedCallback', $value3, 'Lock returned callback after release' );
 235                 unset( $value3 );
 236
 237                 $value1 = $this->cache->getScopedLock( $key, 0, 5, 'reentry' );
 238                 $value2 = $this->cache->getScopedLock( $key, 0, 5, 'reentry' );
 239
 240                 $this->assertType( 'ScopedCallback', $value1, 'First reentrant call returned lock' );
 241                 $this->assertType( 'ScopedCallback', $value1, 'Second reentrant call returned lock' );
 242         }
 243 }