Class: Prometheus::Client::LabelSetValidator

Inherits:
Object
  • Object
show all
Defined in:
lib/prometheus/client/label_set_validator.rb

Overview

LabelSetValidator ensures that all used label sets comply with the Prometheus specification.

Defined Under Namespace

Classes: InvalidLabelError, InvalidLabelSetError, LabelSetError, ReservedLabelError

Constant Summary collapse

RESERVED_LABELS =

TODO: we might allow setting :instance in the future

[:job, :instance]

Instance Method Summary collapse

Constructor Details

#initialize ⇒ LabelSetValidator

Returns a new instance of LabelSetValidator.



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# File 'lib/prometheus/client/label_set_validator.rb', line 16

def initialize
  @validated = {}
end

Instance Method Details

#valid?(labels) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/prometheus/client/label_set_validator.rb', line 20

def valid?(labels)
  unless labels.respond_to?(:all?)
    fail InvalidLabelSetError, "#{labels} is not a valid label set"
  end

  labels.all? do |key, _|
    validate_symbol(key)
    validate_name(key)
    validate_reserved_key(key)
  end
end

#validate(labels) ⇒ Object 



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# File 'lib/prometheus/client/label_set_validator.rb', line 32

def validate(labels)
  return labels if @validated.key?(labels.hash)

  valid?(labels)

  unless @validated.empty? || match?(labels, @validated.first.last)
    fail InvalidLabelSetError, 'labels must have the same signature'
  end

  @validated[labels.hash] = labels
end