Class: PromMultiProc::Collector

Inherits:
Object
  • Object
show all
Defined in:
lib/prom_multi_proc/collector.rb

Direct Known Subclasses

Counter, Gauge, Histogram, Summary

Constant Summary collapse

EXCLUDED_FROM_METRIC_METHODS = 
%i(validate! to_msg).freeze

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(name, label_keys, writer) ⇒ Collector

Returns a new instance of Collector.



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# File 'lib/prom_multi_proc/collector.rb', line 13

def initialize(name, label_keys, writer)
  @name = name
  @label_keys = label_keys
  @writer = writer
end

Instance Attribute Details

#name ⇒ Object (readonly)

Returns the value of attribute name.



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# File 'lib/prom_multi_proc/collector.rb', line 5

def name
  @name
end

Class Method Details

.metric_methods ⇒ Object 



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# File 'lib/prom_multi_proc/collector.rb', line 9

def self.metric_methods
  @metric_methods ||= (public_instance_methods(false) - EXCLUDED_FROM_METRIC_METHODS).map(&:to_s).freeze
end

Instance Method Details

#metric_methods ⇒ Object 



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# File 'lib/prom_multi_proc/collector.rb', line 19

def metric_methods
  self.class.metric_methods
end

#to_msg(method, value, labels) ⇒ Object 



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# File 'lib/prom_multi_proc/collector.rb', line 38

def to_msg(method, value, labels)
  { "name" => name,
    "method" => method,
    "value" => value.to_f,
    "label_values" => labels.values }
end

#validate!(method, value, labels) ⇒ Object 



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# File 'lib/prom_multi_proc/collector.rb', line 23

def validate!(method, value, labels)
  unless valid_method?(method)
    raise PromMultiProcError.new("Invalid metric method (#{method}): try: #{metric_methods.inspect}")
  end
  unless valid_label_keys?(labels)
    raise PromMultiProcError.new("Invalid label cardinality (#{name}): #{labels.keys.inspect}, need keys: #{@label_keys.inspect}")
  end
  unless valid_label_values?(labels)
    raise PromMultiProcError.new("Invalid label values (#{name}): #{labels.values.inspect} (all values must be string or symbol)")
  end
  unless valid_value?(value)
    raise PromMultiProcError.new("Invalid value (#{name}): #{value.inspect} (must be numeric)")
  end
end