includes/profiler/Profiler.php

   1 <?php
   2 /**
   3  * Base class for profiling.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup Profiler
  22  * @defgroup Profiler Profiler
  23  */
  24 use Wikimedia\ScopedCallback;
  25 use Wikimedia\Rdbms\TransactionProfiler;
  26
  27 /**
  28  * Profiler base class that defines the interface and some trivial
  29  * functionality
  30  *
  31  * @ingroup Profiler
  32  */
  33 abstract class Profiler {
  34         /** @var string|bool Profiler ID for bucketing data */
  35         protected $profileID = false;
  36         /** @var bool Whether MediaWiki is in a SkinTemplate output context */
  37         protected $templated = false;
  38         /** @var array All of the params passed from $wgProfiler */
  39         protected $params = [];
  40         /** @var IContextSource Current request context */
  41         protected $context = null;
  42         /** @var TransactionProfiler */
  43         protected $trxProfiler;
  44         /** @var Profiler */
  45         private static $instance = null;
  46
  47         /**
  48          * @param array $params
  49          */
  50         public function __construct( array $params ) {
  51                 if ( isset( $params['profileID'] ) ) {
  52                         $this->profileID = $params['profileID'];
  53                 }
  54                 $this->params = $params;
  55                 $this->trxProfiler = new TransactionProfiler();
  56         }
  57
  58         /**
  59          * Singleton
  60          * @return Profiler
  61          */
  62         final public static function instance() {
  63                 if ( self::$instance === null ) {
  64                         global $wgProfiler, $wgProfileLimit;
  65
  66                         $params = [
  67                                 'class'     => 'ProfilerStub',
  68                                 'sampling'  => 1,
  69                                 'threshold' => $wgProfileLimit,
  70                                 'output'    => [],
  71                         ];
  72                         if ( is_array( $wgProfiler ) ) {
  73                                 $params = array_merge( $params, $wgProfiler );
  74                         }
  75
  76                         $inSample = mt_rand( 0, $params['sampling'] - 1 ) === 0;
  77                         if ( PHP_SAPI === 'cli' || !$inSample ) {
  78                                 $params['class'] = 'ProfilerStub';
  79                         }
  80
  81                         if ( !is_array( $params['output'] ) ) {
  82                                 $params['output'] = [ $params['output'] ];
  83                         }
  84
  85                         self::$instance = new $params['class']( $params );
  86                 }
  87                 return self::$instance;
  88         }
  89
  90         /**
  91          * Replace the current profiler with $profiler if no non-stub profiler is set
  92          *
  93          * @param Profiler $profiler
  94          * @throws MWException
  95          * @since 1.25
  96          */
  97         final public static function replaceStubInstance( Profiler $profiler ) {
  98                 if ( self::$instance && !( self::$instance instanceof ProfilerStub ) ) {
  99                         throw new MWException( 'Could not replace non-stub profiler instance.' );
 100                 } else {
 101                         self::$instance = $profiler;
 102                 }
 103         }
 104
 105         /**
 106          * @param string $id
 107          */
 108         public function setProfileID( $id ) {
 109                 $this->profileID = $id;
 110         }
 111
 112         /**
 113          * @return string
 114          */
 115         public function getProfileID() {
 116                 if ( $this->profileID === false ) {
 117                         return wfWikiID();
 118                 } else {
 119                         return $this->profileID;
 120                 }
 121         }
 122
 123         /**
 124          * Sets the context for this Profiler
 125          *
 126          * @param IContextSource $context
 127          * @since 1.25
 128          */
 129         public function setContext( $context ) {
 130                 $this->context = $context;
 131         }
 132
 133         /**
 134          * Gets the context for this Profiler
 135          *
 136          * @return IContextSource
 137          * @since 1.25
 138          */
 139         public function getContext() {
 140                 if ( $this->context ) {
 141                         return $this->context;
 142                 } else {
 143                         wfDebug( __METHOD__ . " called and \$context is null. " .
 144                                 "Return RequestContext::getMain(); for sanity\n" );
 145                         return RequestContext::getMain();
 146                 }
 147         }
 148
 149         // Kept BC for now, remove when possible
 150         public function profileIn( $functionname ) {
 151         }
 152
 153         public function profileOut( $functionname ) {
 154         }
 155
 156         /**
 157          * Mark the start of a custom profiling frame (e.g. DB queries).
 158          * The frame ends when the result of this method falls out of scope.
 159          *
 160          * @param string $section
 161          * @return ScopedCallback|null
 162          * @since 1.25
 163          */
 164         abstract public function scopedProfileIn( $section );
 165
 166         /**
 167          * @param SectionProfileCallback $section
 168          */
 169         public function scopedProfileOut( SectionProfileCallback &$section = null ) {
 170                 $section = null;
 171         }
 172
 173         /**
 174          * @return TransactionProfiler
 175          * @since 1.25
 176          */
 177         public function getTransactionProfiler() {
 178                 return $this->trxProfiler;
 179         }
 180
 181         /**
 182          * Close opened profiling sections
 183          */
 184         abstract public function close();
 185
 186         /**
 187          * Get all usable outputs.
 188          *
 189          * @throws MWException
 190          * @return array Array of ProfilerOutput instances.
 191          * @since 1.25
 192          */
 193         private function getOutputs() {
 194                 $outputs = [];
 195                 foreach ( $this->params['output'] as $outputType ) {
 196                         // The class may be specified as either the full class name (for
 197                         // example, 'ProfilerOutputStats') or (for backward compatibility)
 198                         // the trailing portion of the class name (for example, 'stats').
 199                         $outputClass = strpos( $outputType, 'ProfilerOutput' ) === false
 200                                 ? 'ProfilerOutput' . ucfirst( $outputType )
 201                                 : $outputType;
 202                         if ( !class_exists( $outputClass ) ) {
 203                                 throw new MWException( "'$outputType' is an invalid output type" );
 204                         }
 205                         $outputInstance = new $outputClass( $this, $this->params );
 206                         if ( $outputInstance->canUse() ) {
 207                                 $outputs[] = $outputInstance;
 208                         }
 209                 }
 210                 return $outputs;
 211         }
 212
 213         /**
 214          * Log the data to some store or even the page output
 215          *
 216          * @since 1.25
 217          */
 218         public function logData() {
 219                 $request = $this->getContext()->getRequest();
 220
 221                 $timeElapsed = $request->getElapsedTime();
 222                 $timeElapsedThreshold = $this->params['threshold'];
 223                 if ( $timeElapsed <= $timeElapsedThreshold ) {
 224                         return;
 225                 }
 226
 227                 $outputs = $this->getOutputs();
 228                 if ( !$outputs ) {
 229                         return;
 230                 }
 231
 232                 $stats = $this->getFunctionStats();
 233                 foreach ( $outputs as $output ) {
 234                         $output->log( $stats );
 235                 }
 236         }
 237
 238         /**
 239          * Output current data to the page output if configured to do so
 240          *
 241          * @throws MWException
 242          * @since 1.26
 243          */
 244         public function logDataPageOutputOnly() {
 245                 foreach ( $this->getOutputs() as $output ) {
 246                         if ( $output instanceof ProfilerOutputText ) {
 247                                 $stats = $this->getFunctionStats();
 248                                 $output->log( $stats );
 249                         }
 250                 }
 251         }
 252
 253         /**
 254          * Get the content type sent out to the client.
 255          * Used for profilers that output instead of store data.
 256          * @return string
 257          * @since 1.25
 258          */
 259         public function getContentType() {
 260                 foreach ( headers_list() as $header ) {
 261                         if ( preg_match( '#^content-type: (\w+/\w+);?#i', $header, $m ) ) {
 262                                 return $m[1];
 263                         }
 264                 }
 265                 return null;
 266         }
 267
 268         /**
 269          * Mark this call as templated or not
 270          *
 271          * @param bool $t
 272          */
 273         public function setTemplated( $t ) {
 274                 $this->templated = $t;
 275         }
 276
 277         /**
 278          * Was this call as templated or not
 279          *
 280          * @return bool
 281          */
 282         public function getTemplated() {
 283                 return $this->templated;
 284         }
 285
 286         /**
 287          * Get the aggregated inclusive profiling data for each method
 288          *
 289          * The percent time for each time is based on the current "total" time
 290          * used is based on all methods so far. This method can therefore be
 291          * called several times in between several profiling calls without the
 292          * delays in usage of the profiler skewing the results. A "-total" entry
 293          * is always included in the results.
 294          *
 295          * When a call chain involves a method invoked within itself, any
 296          * entries for the cyclic invocation should be be demarked with "@".
 297          * This makes filtering them out easier and follows the xhprof style.
 298          *
 299          * @return array List of method entries arrays, each having:
 300          *   - name     : method name
 301          *   - calls    : the number of invoking calls
 302          *   - real     : real time elapsed (ms)
 303          *   - %real    : percent real time
 304          *   - cpu      : CPU time elapsed (ms)
 305          *   - %cpu     : percent CPU time
 306          *   - memory   : memory used (bytes)
 307          *   - %memory  : percent memory used
 308          *   - min_real : min real time in a call (ms)
 309          *   - max_real : max real time in a call (ms)
 310          * @since 1.25
 311          */
 312         abstract public function getFunctionStats();
 313
 314         /**
 315          * Returns a profiling output to be stored in debug file
 316          *
 317          * @return string
 318          */
 319         abstract public function getOutput();
 320 }