docs/logger.txt

   1 MediaWiki\Logger\LoggerFactory implements a PSR-3 [0] compatible message
   2 logging system.
   3
   4 Named Psr\Log\LoggerInterface instances can be obtained from the
   5 MediaWiki\Logger\LoggerFactory::getInstance() static method.
   6 MediaWiki\Logger\LoggerFactory expects a class implementing the
   7 MediaWiki\Logger\Spi interface to act as a factory for new
   8 Psr\Log\LoggerInterface instances.
   9
  10 The "Spi" in MediaWiki\Logger\Spi stands for "service provider interface". An
  11 SPI is an API intended to be implemented or extended by a third party. This
  12 software design pattern is intended to enable framework extension and
  13 replaceable components. It is specifically used in the
  14 MediaWiki\Logger\LoggerFactory service to allow alternate PSR-3 logging
  15 implementations to be easily integrated with MediaWiki.
  16
  17 The service provider interface allows the backend logging library to be
  18 implemented in multiple ways. The $wgMWLoggerDefaultSpi global provides the
  19 classname of the default MediaWiki\Logger\Spi implementation to be loaded at
  20 runtime. This can either be the name of a class implementing the
  21 MediaWiki\Logger\Spi with a zero argument constructor or a callable that will
  22 return an MediaWiki\Logger\Spi instance. Alternately the
  23 MediaWiki\Logger\LoggerFactory::registerProvider() static method can be called
  24 to inject an MediaWiki\Logger\Spi instance into the LoggerFactory and bypass
  25 the use of the default configuration variable.
  26
  27 The MediaWiki\Logger\LegacySpi class implements a service provider to generate
  28 MediaWiki\Logger\LegacyLogger instances. The MediaWiki\Logger\LegacyLogger
  29 class implements the PSR-3 logger interface and provides output and
  30 configuration equivalent to the historic logging output of wfDebug,
  31 wfDebugLog, wfLogDBError and wfErrorLog. The MediaWiki\Logger\LegacySpi class
  32 is the default service provider configured in DefaultSettings.php. It's usage
  33 should be transparent for users who are not ready or do not wish to switch to
  34 a alternate logging platform.
  35
  36 The MediaWiki\Logger\MonologSpi class implements a service provider to
  37 generate Psr\Log\LoggerInterface instances that use the Monolog [1] logging
  38 library. See the PHP docs (or source) for MediaWiki\Logger\MonologSpi for
  39 details on the configuration of this provider. The default configuration
  40 installs a null handler that will silently discard all logging events. The
  41 documentation provided by the class describes a more feature rich logging
  42 configuration.
  43
  44 == Classes ==
  45 ; MediaWiki\Logger\LoggerFactory
  46 : Factory for Psr\Log\LoggerInterface loggers
  47 ; MediaWiki\Logger\Spi
  48 : Service provider interface for MediaWiki\Logger\LoggerFactory
  49 ; MediaWiki\Logger\NullSpi
  50 : MediaWiki\Logger\Spi for creating instances that discard all log events
  51 ; MediaWiki\Logger\LegacySpi
  52 : Service provider for creating MediaWiki\Logger\LegacyLogger instances
  53 ; MediaWiki\Logger\LegacyLogger
  54 : PSR-3 logger that mimics the historical output and configuration of wfDebug,
  55   wfErrorLog and other global logging functions.
  56 ; MediaWiki\Logger\MonologSpi
  57 : MediaWiki\Logger\Spi for creating instances backed by the monolog logging library
  58 ; MediaWiki\Logger\Monolog\LegacyHandler
  59 : Monolog handler that replicates the udp2log and file logging
  60   functionality of wfErrorLog()
  61 ; MediaWiki\Logger\Monolog\WikiProcessor
  62 : Monolog log processer that adds host: wfHostname() and wiki: wfWikiID()
  63   to all records
  64
  65 == Globals ==
  66 ; $wgMWLoggerDefaultSpi
  67 : Specification for creating the default service provider interface to use
  68   with MediaWiki\Logger\LoggerFactory
  69
  70 [0]: https://github.com/php-fig/fig-standards/blob/master/accepted/PSR-3-logger-interface.md
  71 [1]: https://github.com/Seldaek/monolog