Class: God::Logger

Inherits:
SimpleLogger show all
Defined in:
lib/god/logger.rb

Constant Summary collapse

SYSLOG_EQUIVALENTS = 
{:fatal => :crit,
:error => :err,
:warn => :debug,
:info => :debug,
:debug => :debug}

Constants inherited from SimpleLogger

SimpleLogger::DEBUG, SimpleLogger::ERROR, SimpleLogger::FATAL, SimpleLogger::INFO, SimpleLogger::SEV_LABEL, SimpleLogger::WARN

Class Attribute Summary collapse

Instance Attribute Summary collapse

Attributes inherited from SimpleLogger

#datetime_format, #level

Instance Method Summary collapse

Methods inherited from SimpleLogger

#debug, #error, #fatal, #info, #output, #warn

Constructor Details

#initialize ⇒ Logger

Instantiate a new Logger object



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# File 'lib/god/logger.rb', line 19

def initialize
  super($stdout)
  self.logs = {}
  @mutex = Mutex.new
  @capture = nil
  @spool = Time.now - 10
  @templogio = StringIO.new
  @templog = SimpleLogger.new(@templogio)
  @templog.level = Logger::INFO
  load_syslog
end

Class Attribute Details

.syslog ⇒ Object

Returns the value of attribute syslog.



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# File 'lib/god/logger.rb', line 13

def syslog
  @syslog
end

Instance Attribute Details

#logs ⇒ Object

Returns the value of attribute logs.



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# File 'lib/god/logger.rb', line 10

def logs
  @logs
end

Instance Method Details

#finish_capture ⇒ Object

Disable capturing of log and return what was captured since capturing was enabled with Logger#start_capture

Returns String



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# File 'lib/god/logger.rb', line 115

def finish_capture
  @mutex.synchronize do
    cap = @capture.string
    @capture = nil
    cap
  end
end

#load_syslog ⇒ Object

If Logger.syslog is true then attempt to load the syslog bindings. If syslog cannot be loaded, then set Logger.syslog to false and continue.

Returns nothing



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# File 'lib/god/logger.rb', line 35

def load_syslog
  return unless Logger.syslog
  
  begin
    require 'syslog'
    
    # Ensure that Syslog is open
    begin
      Syslog.open('god')
    rescue RuntimeError
      Syslog.reopen('god')
    end
  rescue Exception
    Logger.syslog = false
  end
end

#log(watch, level, text) ⇒ Object

Log a message

+watch+ is the String name of the Watch (may be nil if not Watch is applicable)
+level+ is the log level [:debug|:info|:warn|:error|:fatal]
+text+ is the String message

Returns nothing



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# File 'lib/god/logger.rb', line 58

def log(watch, level, text)
  # initialize watch log if necessary
  self.logs[watch.name] ||= Timeline.new(God::LOG_BUFFER_SIZE_DEFAULT) if watch
  
  # push onto capture and timeline for the given watch
  @templogio.truncate(0)
  @templogio.rewind
  @templog.send(level, text % [])
  @mutex.synchronize do
    @capture.puts(@templogio.string.dup) if @capture
    if watch && (Time.now - @spool < 2)
      self.logs[watch.name] << [Time.now, @templogio.string.dup]
    end
  end
  
  # send to regular logger
  self.send(level, text % [])
  
  # send to syslog
  Syslog.send(SYSLOG_EQUIVALENTS[level], text) if Logger.syslog
end

#start_capture ⇒ Object

Enable capturing of log

Returns nothing



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# File 'lib/god/logger.rb', line 105

def start_capture
  @mutex.synchronize do
    @capture = StringIO.new
  end
end

#watch_log_since(watch_name, since) ⇒ Object

Get all log output for a given Watch since a certain Time.

+watch_name+ is the String name of the Watch
+since+ is the Time since which to fetch log lines

Returns String



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# File 'lib/god/logger.rb', line 85

def watch_log_since(watch_name, since)
  # initialize watch log if necessary
  self.logs[watch_name] ||= Timeline.new(God::LOG_BUFFER_SIZE_DEFAULT)
  
  # get and join lines since given time
  @mutex.synchronize do
    @spool = Time.now
    self.logs[watch_name].select do |x|
      x.first > since
    end.map do |x|
      x[1]
    end.join
  end
end