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# frozen_string_literal: true
module Rack
# Rack::CommonLogger forwards every request to the given +app+, and
# logs a line in the
# {Apache common log format}[http://httpd.apache.org/docs/1.3/logs.html#common]
# to the configured logger.
class CommonLogger
# Common Log Format: http://httpd.apache.org/docs/1.3/logs.html#common
#
# lilith.local - - [07/Aug/2006 23:58:02 -0400] "GET / HTTP/1.1" 500 -
#
# %{%s - %s [%s] "%s %s%s %s" %d %s\n} %
#
# The actual format is slightly different than the above due to the
# separation of SCRIPT_NAME and PATH_INFO, and because the elapsed
# time in seconds is included at the end.
FORMAT = %{%s - %s [%s] "%s %s%s%s %s" %d %s %0.4f }
# +logger+ can be any object that supports the +write+ or +<<+ methods,
# which includes the standard library Logger. These methods are called
# with a single string argument, the log message.
# If +logger+ is nil, CommonLogger will fall back <tt>env['rack.errors']</tt>.
def initialize(app, logger = nil)
@app = app
@logger = logger
end
# Log all requests in common_log format after a response has been
# returned. Note that if the app raises an exception, the request
# will not be logged, so if exception handling middleware are used,
# they should be loaded after this middleware. Additionally, because
# the logging happens after the request body has been fully sent, any
# exceptions raised during the sending of the response body will
# cause the request not to be logged.
def call(env)
began_at = Utils.clock_time
status, headers, body = @app.call(env)
headers = Utils::HeaderHash[headers]
body = BodyProxy.new(body) { log(env, status, headers, began_at) }
[status, headers, body]
end
private
# Log the request to the configured logger.
def log(env, status, header, began_at)
length = extract_content_length(header)
msg = FORMAT % [
env['HTTP_X_FORWARDED_FOR'] || env["REMOTE_ADDR"] || "-",
env["REMOTE_USER"] || "-",
Time.now.strftime("%d/%b/%Y:%H:%M:%S %z"),
env[REQUEST_METHOD],
env[SCRIPT_NAME],
env[PATH_INFO],
env[QUERY_STRING].empty? ? "" : "?#{env[QUERY_STRING]}",
env[SERVER_PROTOCOL],
status.to_s[0..3],
length,
Utils.clock_time - began_at ]
msg.gsub!(/[^[:print:]]/) { |c| sprintf("\\x%x", c.ord) }
msg[-1] = "\n"
logger = @logger || env[RACK_ERRORS]
# Standard library logger doesn't support write but it supports << which actually
# calls to write on the log device without formatting
if logger.respond_to?(:write)
logger.write(msg)
else
logger << msg
end
end
# Attempt to determine the content length for the response to
# include it in the logged data.
def extract_content_length(headers)
value = headers[CONTENT_LENGTH]
!value || value.to_s == '0' ? '-' : value
end
end
end