Statsd Metric

A fast StatsD / DogStatsD metric encoder and single-pass parser.

StatsdMetric supports all standard StatsD metric types:

• Counter
• Gauge
• Histogram
• Timer
• Set
• Meter

It also supports DogStatsD sample rates and tags.

Installation

The package can be installed by adding statsd_metric to your list of dependencies in mix.exs:

def deps do
  [
    {:statsd_metric, "~> 1.0"}
  ]
end

Usage (documentation)

Encoding Example

iex> metric = %StatsdMetric{key: "name.spaced", value: 1.0, type: :counter}
iex> StatsdMetric.encode(metric)
["name.spaced", 58, "1.0", 124, "c"]

iex> metric = %StatsdMetric{key: "name.spaced", value: 1.0, type: :counter}
iex> StatsdMetric.encode_to_string(metric)
"name.spaced:1.0|c"

Directly encoding stat parameters is also supported:

iex> StatsdMetric.encode_parts("name.spaced", 1.0, :counter)
["name.spaced", 58, "1.0", 124, "c"]

iex> StatsdMetric.encode_parts_to_string("name.spaced", 1.0, :counter)
"name.spaced:1.0|c"

Parsing Example

iex> StatsdMetric.decode!("name.spaced:1.0|c|@0.1|#foo:bar")
%StatsdMetric{
  key: "name.spaced",
  value: 1.0,
  type: :counter,
  sample_rate: 0.1,
  tags: %{"foo" => "bar"}
}

Multiple metrics separated by a newline are also supported:

iex> StatsdMetric.decode!("first.metric:1.0|c|@0.1|#foo:bar\\nsecond.metric:15.0|g|#foo:bar")
[
  %StatsdMetric{
    key: "first.metric",
    value: 1.0,
    type: :counter,
    sample_rate: 0.1,
    tags: %{"foo" => "bar"}
  },
  %StatsdMetric{
    key: "second.metric",
    value: 15.0,
    type: :gauge,
    tags: %{"foo" => "bar"}
  }
]

License

StatsdMetric is released under the Apache License 2.0.

About

This package was written by Elliot Jackson.

• Blog: https://elliotekj.com
• Email: [email protected]