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Contents
module Prometheus
module Client
module Helper
module MetricsRepresentation
METRIC_LINE = '%s%s %s'.freeze
TYPE_LINE = '# TYPE %s %s'.freeze
HELP_LINE = '# HELP %s %s'.freeze
LABEL = '%s="%s"'.freeze
SEPARATOR = ','.freeze
DELIMITER = "\n".freeze
REGEX = { doc: /[\n\\]/, label: /[\n\\"]/ }.freeze
REPLACE = { "\n" => '\n', '\\' => '\\\\', '"' => '\"' }.freeze
def self.to_text(metrics)
lines = []
metrics.each do |name, metric|
lines << format(HELP_LINE, name, escape(metric[:help]))
lines << format(TYPE_LINE, name, metric[:type])
metric[:samples].each do |metric_name, labels, value|
lines << metric(metric_name, format_labels(labels), value)
end
end
# there must be a trailing delimiter
(lines << nil).join(DELIMITER)
end
def self.metric(name, labels, value)
format(METRIC_LINE, name, labels, value)
end
def self.format_labels(set)
return if set.empty?
strings = set.each_with_object([]) do |(key, value), memo|
memo << format(LABEL, key, escape(value, :label))
end
"{#{strings.join(SEPARATOR)}}"
end
def self.escape(string, format = :doc)
string.to_s.gsub(REGEX[format], REPLACE)
end
end
end
end
end
Version data entries
197 entries across 197 versions & 2 rubygems