require 'rack/body_proxy' module Rack # Rack::CommonLogger forwards every request to an +app+ given, and # logs a line in the Apache common log format to the +logger+, or # rack.errors by default. class CommonLogger # Common Log Format: http://httpd.apache.org/docs/1.3/logs.html#common # lilith.local - - [07/Aug/2006 23:58:02] "GET / HTTP/1.1" 500 - # %{%s - %s [%s] "%s %s%s %s" %d %s\n} % FORMAT = %{%s - %s [%s] "%s %s%s %s" %d %s %0.4f\n} def initialize(app, logger=nil) @app = app @logger = logger end def call(env) began_at = Time.now status, header, body = @app.call(env) header = Utils::HeaderHash.new(header) body = BodyProxy.new(body) { log(env, status, header, began_at) } [status, header, body] end private def log(env, status, header, began_at) now = Time.now length = extract_content_length(header) logger = @logger || env['rack.errors'] logger.write FORMAT % [ env['HTTP_X_FORWARDED_FOR'] || env["REMOTE_ADDR"] || "-", env["REMOTE_USER"] || "-", now.strftime("%d/%b/%Y %H:%M:%S"), env["REQUEST_METHOD"], env["PATH_INFO"], env["QUERY_STRING"].empty? ? "" : "?"+env["QUERY_STRING"], env["HTTP_VERSION"], status.to_s[0..3], length, now - began_at ] end def extract_content_length(headers) value = headers['Content-Length'] or return '-' value.to_s == '0' ? '-' : value end end end