Class: Sapience::Logger

Inherits:
Base
  • Object
show all
Includes:
Concerns::Compatibility
Defined in:
lib/sapience/logger.rb

Overview

Logger stores the class name to be used for all log messages so that every log message written by this instance will include the class name

Constant Summary collapse

@@appender_thread = 
nil

Instance Attribute Summary

Attributes inherited from Base

#filter, #name

Class Method Summary collapse

Instance Method Summary collapse

Methods included from Concerns::Compatibility

#add, #close, included, #reopen

Methods inherited from Base

#application, #default_formatter, #fast_tag, #host, #level, #level=, #measure, #payload, #pop_tags, #push_tags, #silence, #tagged, #tags, #with_payload

Constructor Details

#initialize(klass, level = nil, filter = nil) ⇒ Logger

Returns a Logger instance

Return the logger for a specific class, supports class specific log levels

logger = Sapience::Logger.new(self)

OR

logger = Sapience::Logger.new('MyClass')

Parameters:

application
  A class, module or a string with the application/class name
  to be used in the logger

level
  The initial log level to start with for this logger instance
  Default: Sapience.config.default_level

filter [Regexp|Proc]
  RegExp: Only include log messages where the class name matches the supplied
  regular expression. All other messages will be ignored
  Proc: Only include log messages where the supplied Proc returns true
        The Proc must return true or false



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# File 'lib/sapience/logger.rb', line 114

def initialize(klass, level = nil, filter = nil)
  super
end

Class Method Details

.appender_thread ⇒ Object

Separate appender thread responsible for reading log messages and calling the appenders in it’s thread rubocop:disable BlockNesting, AssignmentInCondition, PerceivedComplexity, CyclomaticComplexity, AbcSize, LineLength, RescueException



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# File 'lib/sapience/logger.rb', line 81

def self.appender_thread
  @@appender_thread
end

.appender_thread_active? ⇒ Boolean

Returns true if the appender_thread is active

Returns:

  • (Boolean) 


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# File 'lib/sapience/logger.rb', line 74

def self.appender_thread_active?
  @@appender_thread && @@appender_thread.running?
end

.close ⇒ Object

Close all appenders and flush any outstanding messages



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# File 'lib/sapience/logger.rb', line 29

def self.close
  return unless appender_thread
  appender_thread << lambda do
    Sapience.appenders.each do |appender|
      begin
        close_appender(appender)
      rescue StandardError => exc
        logger.error "Appender thread: Failed to close appender: #{appender.inspect}", exc
      end
    end

    logger.trace "Appender thread: All appenders flushed"
  end
end

.close_appender(appender) ⇒ Object 



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# File 'lib/sapience/logger.rb', line 44

def self.close_appender(appender)
  logger.trace "Appender thread: Closing appender: #{appender.name}"
  appender.flush
  appender.close
  Sapience.remove_appender(appender)
end

.flush ⇒ Object

Flush all queued log entries disk, database, etc.

All queued log messages are written and then each appender is flushed in turn



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# File 'lib/sapience/logger.rb', line 12

def self.flush # rubocop:disable AbcSize
  return unless appender_thread
  appender_thread << lambda do
    Sapience.appenders.each do |appender|
      begin
        logger.trace "Appender thread: Flushing appender: #{appender.class.name}"
        appender.flush
      rescue StandardError => exc
        logger.error "Appender thread: Failed to flush appender: #{appender.inspect}", exc
      end
    end

    logger.trace "Appender thread: All appenders flushed"
  end
end

.logger ⇒ Object

Internal logger for Sapience

For example when an appender is not working etc..
By default logs to STDERR



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# File 'lib/sapience/logger.rb', line 56

def self.logger
  @@logger ||= begin
    l      = Sapience::Appender::Stream.new(io: STDERR, level: :warn)
    l.name = name
    l
  end
end

.logger=(logger) ⇒ Object

Allow the internal logger to be overridden from its default to STDERR

Can be replaced with another Ruby logger or Rails logger, but never to
Sapience::Logger itself since it is for reporting problems
while trying to log to the various appenders



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# File 'lib/sapience/logger.rb', line 89

def self.logger=(logger)
  @@logger = logger
end

.start_appender_thread ⇒ Object

Start the appender thread



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# File 'lib/sapience/logger.rb', line 65

def self.start_appender_thread
  return false if appender_thread_active?

  @@appender_thread = Sapience.log_executor_class.new
  fail "Failed to start Appender Thread" unless @@appender_thread
  true
end

Instance Method Details

#log(log, message = nil, progname = nil, &block) ⇒ Object

Place log request on the queue for the Appender thread to write to each appender in the order that they were registered



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# File 'lib/sapience/logger.rb', line 120

def log(log, message = nil, progname = nil, &block)
  # Compatibility with ::Logger
  return add(log, message, progname, &block) unless log.is_a?(Sapience::Log)
  @@appender_thread << lambda do
    Sapience.appenders.each do |appender|
      begin
        appender.log(log)
      rescue StandardError => exc
        self.class.logger.error "Appender thread: Failed to log to appender: #{appender.inspect}", exc
      end
    end
  end if @@appender_thread
end