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require 'active_support/core_ext/time/conversions'
require 'active_support/core_ext/object/blank'
require 'active_support/log_subscriber'
require 'action_dispatch/http/request'
require 'rack/body_proxy'
module Rails
module Rack
# Sets log tags, logs the request, calls the app, and flushes the logs.
#
# Log tags (+taggers+) can be an Array containing: methods that the +request+
# object responds to, objects that respond to +to_s+ or Proc objects that accept
# an instance of the +request+ object.
class Logger < ActiveSupport::LogSubscriber
def initialize(app, taggers = nil)
@app = app
@taggers = taggers || []
end
def call(env)
request = ActionDispatch::Request.new(env)
if logger.respond_to?(:tagged)
logger.tagged(compute_tags(request)) { call_app(request, env) }
else
call_app(request, env)
end
end
protected
def call_app(request, env)
instrumenter = ActiveSupport::Notifications.instrumenter
instrumenter.start 'request.action_dispatch', request: request
logger.info { started_request_message(request) }
resp = @app.call(env)
resp[2] = ::Rack::BodyProxy.new(resp[2]) { finish(request) }
resp
rescue Exception
finish(request)
raise
ensure
ActiveSupport::LogSubscriber.flush_all!
end
# Started GET "/session/new" for 127.0.0.1 at 2012-09-26 14:51:42 -0700
def started_request_message(request)
'Started %s "%s" for %s at %s' % [
request.request_method,
request.filtered_path,
request.ip,
Time.now.to_default_s ]
end
def compute_tags(request)
@taggers.collect do |tag|
case tag
when Proc
tag.call(request)
when Symbol
request.send(tag)
else
tag
end
end
end
private
def finish(request)
instrumenter = ActiveSupport::Notifications.instrumenter
instrumenter.finish 'request.action_dispatch', request: request
end
def logger
Rails.logger
end
end
end
end
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