Class: Fluent::StatsitePlugin::MetricFormat

Inherits:
Object
  • Object
show all
Defined in:
lib/fluent/plugin/statsite/metric_format.rb

Overview

This represent a key/value format of Metric

Constant Summary collapse

CONSTANT_VALUE = 
'\w+'
SUBSTITUTE = 
'\$\{\w+\}'
SUBSTITUTE_REGEXP = 
/\$\{(\w+)\}/
ELEMENT = 
"(?:#{CONSTANT_VALUE}|#{SUBSTITUTE})"
PATTERN = 
"#{ELEMENT}+"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(str) ⇒ MetricFormat

Returns a new instance of MetricFormat.



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# File 'lib/fluent/plugin/statsite/metric_format.rb', line 11

def initialize(str)
  @str = str
  @no_substitute = str.index('$').nil?
end

Class Method Details

.validate(str) ⇒ Object 



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# File 'lib/fluent/plugin/statsite/metric_format.rb', line 28

def self.validate(str)
  if /^#{PATTERN}$/.match(str).nil?
    raise ConfigError, "invalid format of key/value field, it must be #{PATTERN}, but specified as #{str}"
  end

  new(str)
end

Instance Method Details

#convert(record) ⇒ Object 



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# File 'lib/fluent/plugin/statsite/metric_format.rb', line 16

def convert(record)
  if @no_substitute
    @str
  else
    @str.gsub(SUBSTITUTE_REGEXP) { record.fetch($1) } rescue nil
  end
end

#to_s ⇒ Object 



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# File 'lib/fluent/plugin/statsite/metric_format.rb', line 24

def to_s
  @str
end