class Rack::CommonLogger
Rack::CommonLogger forwards every request
to the given app
, and logs a line in the Apache common log
format to the logger
.
If logger
is nil, CommonLogger
will fall back rack.errors
, which is an instance of Rack::NullLogger.
logger
can be any class, including the standard library Logger, and is expected to have a write
method, which accepts the CommonLogger::FORMAT. According to the SPEC, the
error stream must also respond to puts
(which takes a single
argument that responds to to_s
), and flush
(which
is called without arguments in order to make the error appear for sure)
Constants
- FORMAT
Common Log Format: 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} %
Public Class Methods
new(app, logger=nil)
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# File lib/rack/commonlogger.rb, line 26 def initialize(app, logger=nil) @app = app @logger = logger end
Public Instance Methods
call(env)
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# File lib/rack/commonlogger.rb, line 31 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 Instance Methods
extract_content_length(headers)
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# File lib/rack/commonlogger.rb, line 59 def extract_content_length(headers) value = headers['Content-Length'] or return '-' value.to_s == '0' ? '-' : value end
log(env, status, header, began_at)
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# File lib/rack/commonlogger.rb, line 41 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