Class: Datadog::Metrics

Inherits:
Object
  • Object
show all
Extended by:
Helpers, Options
Includes:
Options
Defined in:
lib/ddtrace/metrics.rb

Overview

Acts as client for sending metrics (via Statsd) Wraps a Statsd client with default tags and additional configuration.

Defined Under Namespace

Modules: Helpers, Logging, Options Classes: Metric

Constant Summary

Constants included from Options

Options::DEFAULT

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Options

default_metric_options, metric_options

Constructor Details

#initialize(statsd: nil, enabled: true, **_) ⇒ Metrics

Returns a new instance of Metrics.



17
18
19
20
21
22
23
24
25
26
 
# File 'lib/ddtrace/metrics.rb', line 17

def initialize(statsd: nil, enabled: true, **_)
  @statsd =
    if supported?
      statsd || default_statsd_client
    else
      ignored_statsd_warning if statsd
      nil
    end
  @enabled = enabled
end

Instance Attribute Details

#statsd ⇒ Object (readonly)

Returns the value of attribute statsd.



15
16
17
 
# File 'lib/ddtrace/metrics.rb', line 15

def statsd
  @statsd
end

Instance Method Details

#close ⇒ Object 



148
149
150
 
# File 'lib/ddtrace/metrics.rb', line 148

def close
  @statsd.close if @statsd && @statsd.respond_to?(:close)
end

#configure(options = {}) ⇒ Object 



75
76
77
78
 
# File 'lib/ddtrace/metrics.rb', line 75

def configure(options = {})
  @statsd = options[:statsd] if options.key?(:statsd)
  self.enabled = options[:enabled] if options.key?(:enabled)
end

#count(stat, value = nil, options = nil, &block) ⇒ Object 



84
85
86
87
88
89
90
91
92
93
 
# File 'lib/ddtrace/metrics.rb', line 84

def count(stat, value = nil, options = nil, &block)
  return unless send_stats? && statsd.respond_to?(:count)

  value, options = yield if block
  raise ArgumentError if value.nil?

  statsd.count(stat, value, metric_options(options))
rescue StandardError => e
  Datadog.logger.error("Failed to send count stat. Cause: #{e.message} Source: #{Array(e.backtrace).first}")
end

#default_hostname ⇒ Object 



45
46
47
 
# File 'lib/ddtrace/metrics.rb', line 45

def default_hostname
  ENV.fetch(Datadog::Ext::Metrics::ENV_DEFAULT_HOST, Datadog::Ext::Metrics::DEFAULT_HOST)
end

#default_port ⇒ Object 



49
50
51
 
# File 'lib/ddtrace/metrics.rb', line 49

def default_port
  ENV.fetch(Datadog::Ext::Metrics::ENV_DEFAULT_PORT, Datadog::Ext::Metrics::DEFAULT_PORT).to_i
end

#default_statsd_client ⇒ Object 



53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
 
# File 'lib/ddtrace/metrics.rb', line 53

def default_statsd_client
  require 'datadog/statsd'

  # Create a StatsD client that points to the agent.
  #
  # We use `single_thread: true`, as dogstatsd-ruby >= 5.0 creates a background thread
  # by default, but does not handle forks correctly, causing resource leaks.
  #
  # Using dogstatsd-ruby >= 5.0 is still valuable, as it supports
  # transparent batch metric submission, which reduces submission
  # overhead.
  #
  # Versions < 5.0 are always single-threaded, but do not have the kwarg option.
  options = if dogstatsd_version >= Gem::Version.new('5.2')
              { single_thread: true }
            else
              {}
            end

  Datadog::Statsd.new(default_hostname, default_port, **options)
end

#distribution(stat, value = nil, options = nil, &block) ⇒ Object 



95
96
97
98
99
100
101
102
103
104
 
# File 'lib/ddtrace/metrics.rb', line 95

def distribution(stat, value = nil, options = nil, &block)
  return unless send_stats? && statsd.respond_to?(:distribution)

  value, options = yield if block
  raise ArgumentError if value.nil?

  statsd.distribution(stat, value, metric_options(options))
rescue StandardError => e
  Datadog.logger.error("Failed to send distribution stat. Cause: #{e.message} Source: #{Array(e.backtrace).first}")
end

#enabled=(enabled) ⇒ Object 



41
42
43
 
# File 'lib/ddtrace/metrics.rb', line 41

def enabled=(enabled)
  @enabled = (enabled == true)
end

#enabled? ⇒ Boolean

Returns:

  • (Boolean) 


37
38
39
 
# File 'lib/ddtrace/metrics.rb', line 37

def enabled?
  @enabled
end

#gauge(stat, value = nil, options = nil, &block) ⇒ Object 



116
117
118
119
120
121
122
123
124
125
 
# File 'lib/ddtrace/metrics.rb', line 116

def gauge(stat, value = nil, options = nil, &block)
  return unless send_stats? && statsd.respond_to?(:gauge)

  value, options = yield if block
  raise ArgumentError if value.nil?

  statsd.gauge(stat, value, metric_options(options))
rescue StandardError => e
  Datadog.logger.error("Failed to send gauge stat. Cause: #{e.message} Source: #{Array(e.backtrace).first}")
end

#increment(stat, options = nil) ⇒ Object 



106
107
108
109
110
111
112
113
114
 
# File 'lib/ddtrace/metrics.rb', line 106

def increment(stat, options = nil)
  return unless send_stats? && statsd.respond_to?(:increment)

  options = yield if block_given?

  statsd.increment(stat, metric_options(options))
rescue StandardError => e
  Datadog.logger.error("Failed to send increment stat. Cause: #{e.message} Source: #{Array(e.backtrace).first}")
end

#send_metrics(metrics) ⇒ Object 



144
145
146
 
# File 'lib/ddtrace/metrics.rb', line 144

def send_metrics(metrics)
  metrics.each { |m| send(m.type, *[m.name, m.value, m.options].compact) }
end

#send_stats? ⇒ Boolean

Returns:

  • (Boolean) 


80
81
82
 
# File 'lib/ddtrace/metrics.rb', line 80

def send_stats?
  enabled? && !statsd.nil?
end

#supported? ⇒ Boolean

Returns:

  • (Boolean) 


28
29
30
31
32
33
34
35
 
# File 'lib/ddtrace/metrics.rb', line 28

def supported?
  version = dogstatsd_version

  !version.nil? && version >= Gem::Version.new('3.3.0') &&
    # dogstatsd-ruby >= 5.0 & < 5.2.0 has known issues with process forks
    # and do not support the single thread mode we use to avoid this problem.
    !(version >= Gem::Version.new('5.0') && version < Gem::Version.new('5.3'))
end

#time(stat, options = nil) ⇒ Object 



127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
 
# File 'lib/ddtrace/metrics.rb', line 127

def time(stat, options = nil)
  return yield unless send_stats?

  # Calculate time, send it as a distribution.
  start = Utils::Time.get_time
  yield
ensure
  begin
    if send_stats? && !start.nil?
      finished = Utils::Time.get_time
      distribution(stat, ((finished - start) * 1000), options)
    end
  rescue StandardError => e
    Datadog.logger.error("Failed to send time stat. Cause: #{e.message} Source: #{Array(e.backtrace).first}")
  end
end