Class: Log4rExceptionable::RackFailureHandler

Inherits:
Object
  • Object
show all
Includes:
Helper
Defined in:
lib/log4r-exceptionable/rack_failure_handler.rb

Overview

A rack middleware handler that logs exceptions with log4r

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Helper

#add_context, #log_with_context

Constructor Details

#initialize(app, opts = {}) ⇒ RackFailureHandler

Returns a new instance of RackFailureHandler.



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# File 'lib/log4r-exceptionable/rack_failure_handler.rb', line 12

def initialize(app, opts = {})
  @app = app
end

Instance Attribute Details

#args ⇒ Object (readonly)

Returns the value of attribute args.



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# File 'lib/log4r-exceptionable/rack_failure_handler.rb', line 10

def args
  @args
end

Instance Method Details

#_call(env) ⇒ Object 



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# File 'lib/log4r-exceptionable/rack_failure_handler.rb', line 21

def _call(env)
  begin
    # Call the app we are monitoring
    response = @app.call(env)
  rescue => exception
    # An exception has been raised. Send to log4r
    send_to_log4r(exception, env)
  
    # Raise the exception again to pass back to app.
    raise
  end
  
  if env['rack.exception']
    send_to_log4r(env['rack.exception'], env)
  end
  
  response
end

#call(env) ⇒ Object 



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# File 'lib/log4r-exceptionable/rack_failure_handler.rb', line 16

def call(env)
  # Make thread safe
  dup._call(env)
end

#send_to_log4r(exception, env = nil) ⇒ Object 



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# File 'lib/log4r-exceptionable/rack_failure_handler.rb', line 40

def send_to_log4r(exception, env=nil)
  
  log_with_context do |context|
    
    # add rack env to context so our logger can report with that data 
    if env and env.size > 0
      env.each do |k, v|
        begin
          add_context(context, "rack_env_#{k}", v)
        rescue => e
          $stderr.puts "Log4r Exceptionable could not extract a rack env item: " + e.message
        end
      end
    end

    # Determine exception source class if possible, and use its logger if configured to do so.
    error_logger = nil
    if Log4rExceptionable::Configuration.use_source_logger
      controller = env['action_controller.instance']
      if controller && controller.respond_to?(:logger) && controller.logger.instance_of?(Log4r::Logger)
        error_logger = controller.logger 
        begin
          add_context(context, "rack_controller_name", controller.controller_name)
          add_context(context, "rack_action_name", controller.action_name)
        rescue => e
          $stderr.puts "Log4r Exceptionable could not extract controller names: " + e.message
        end
      elsif env['rack.logger'] && env['rack.logger'].instance_of?(Log4r::Logger)
        error_logger = env['rack.logger']
      end
    end
    
    error_logger ||= Log4rExceptionable::Configuration.rack_failure_logger
    
    error_logger.send(Log4rExceptionable::Configuration.log_level, exception)
    
  end
  
end