Class: OstrichPoll::Host

Inherits:
Object
  • Object
show all
Defined in:
lib/ostrichpoll/ostrich_validator.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Host

Returns a new instance of Host.



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 16

def initialize
  validations = []
end

Instance Attribute Details

#rate_file ⇒ Object

Returns the value of attribute rate_file.



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 12

def rate_file
  @rate_file
end

#stored_timestamp ⇒ Object

Returns the value of attribute stored_timestamp.



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 21

def stored_timestamp
  @stored_timestamp
end

#stored_values ⇒ Object

Returns the value of attribute stored_values.



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 20

def stored_values
  @stored_values
end

#url ⇒ Object

Returns the value of attribute url.



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 11

def url
  @url
end

#validations ⇒ Object

Returns the value of attribute validations.



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 13

def validations
  @validations
end

Instance Method Details

#find_value(map, key) ⇒ Object 



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 69

def find_value(map, key)
  tree = map
  key.split('/').each do |selector|
    return nil unless tree.kind_of? Hash
    tree = tree[selector]
  end

  tree
end

#previous_reading(key) ⇒ Object 



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 65

def previous_reading(key)
  return stored_timestamp, find_value(stored_values, key)
end

#validate ⇒ Object 



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 23

def validate
  uri = URI.parse url
  response = Net::HTTP.get uri

  # parse response
  json = JSON.parse(response) rescue (
    Log.error "Invalid JSON response: #{response}"
    return EXIT_ERROR
  )

  @stored_values = {}
  if rate_file
    # read in rate-file
    @stored_values = YAML.load_file(rate_file) rescue (
      Log.warn "Could not parse rate file: #{rate_file}"
      {}
    )

    @stored_timestamp = stored_values['ostrichpoll.timestamp']
    unless @stored_timestamp
      Log.warn "No 'ostrichpoll.timestamp' found in rate file: #{rate_file}"
    end

    # write out new rate file
    json['ostrichpoll.timestamp'] = Time.now.to_i
    File.open(rate_file, 'w') do |f|
      f.puts json.to_yaml
    end
  end

  # execute each validations:
  retval = false
  if validations
    validations.each do |v|
      value = v.check(find_value(json, v.metric))
      retval = value unless retval
    end
  end

  retval
end