1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
require "active_support/core_ext/module/attribute_accessors"
require "active_support/core_ext/class/attribute"
require "active_support/subscriber"
module ActiveSupport
# ActiveSupport::LogSubscriber is an object set to consume
# ActiveSupport::Notifications with the sole purpose of logging them.
# The log subscriber dispatches notifications to a registered object based
# on its given namespace.
#
# An example would be Active Record log subscriber responsible for logging
# queries:
#
# module ActiveRecord
# class LogSubscriber < ActiveSupport::LogSubscriber
# def sql(event)
# "#{event.payload[:name]} (#{event.duration}) #{event.payload[:sql]}"
# end
# end
# end
#
# And it's finally registered as:
#
# ActiveRecord::LogSubscriber.attach_to :active_record
#
# Since we need to know all instance methods before attaching the log
# subscriber, the line above should be called after your
# <tt>ActiveRecord::LogSubscriber</tt> definition.
#
# After configured, whenever a "sql.active_record" notification is published,
# it will properly dispatch the event (ActiveSupport::Notifications::Event) to
# the sql method.
#
# Log subscriber also has some helpers to deal with logging and automatically
# flushes all logs when the request finishes (via action_dispatch.callback
# notification) in a Rails environment.
class LogSubscriber < Subscriber
# Embed in a String to clear all previous ANSI sequences.
CLEAR = "\e[0m"
BOLD = "\e[1m"
# Colors
BLACK = "\e[30m"
RED = "\e[31m"
GREEN = "\e[32m"
YELLOW = "\e[33m"
BLUE = "\e[34m"
MAGENTA = "\e[35m"
CYAN = "\e[36m"
WHITE = "\e[37m"
mattr_accessor :colorize_logging
self.colorize_logging = true
class << self
def logger
@logger ||= if defined?(Rails) && Rails.respond_to?(:logger)
Rails.logger
end
end
attr_writer :logger
def log_subscribers
subscribers
end
# Flush all log_subscribers' logger.
def flush_all!
logger.flush if logger.respond_to?(:flush)
end
end
def logger
LogSubscriber.logger
end
def start(name, id, payload)
super if logger
end
def finish(name, id, payload)
super if logger
rescue Exception => e
logger.error "Could not log #{name.inspect} event. #{e.class}: #{e.message} #{e.backtrace}"
end
protected
%w(info debug warn error fatal unknown).each do |level|
class_eval <<-METHOD, __FILE__, __LINE__ + 1
def #{level}(progname = nil, &block)
logger.#{level}(progname, &block) if logger
end
METHOD
end
# Set color by using a symbol or one of the defined constants. If a third
# option is set to +true+, it also adds bold to the string. This is based
# on the Highline implementation and will automatically append CLEAR to the
# end of the returned String.
def color(text, color, bold = false)
return text unless colorize_logging
color = self.class.const_get(color.upcase) if color.is_a?(Symbol)
bold = bold ? BOLD : ""
"#{bold}#{color}#{text}#{CLEAR}"
end
end
end
|
