Module: Sensu::Plugin::Utils

Included in:
Handler, Mutator
Defined in:
lib/sensu-plugin/utils.rb

Overview

rubocop:disable Metrics/ModuleLength

Instance Method Summary collapse

Instance Method Details

#api_request(method, path) {|req| ... } ⇒ Object

Yields:

  • (req) 


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# File 'lib/sensu-plugin/utils.rb', line 218

def api_request(method, path, &_blk)
  if api_settings.nil?
    raise 'api.json settings not found.'
  end
  use_ssl = api_settings['ssl'].is_a?(Hash) ||
            api_settings['host'].start_with?('https')
  hostname = api_settings['host'].gsub(/https?:\/\//, '')
  req = net_http_req_class(method).new(path)
  if api_settings['user'] && api_settings['password']
    req.basic_auth(api_settings['user'], api_settings['password'])
  end
  yield(req) if block_given?
  res = Net::HTTP.start(hostname, api_settings['port'], use_ssl: use_ssl) do |http|
    http.request(req)
  end
  res
end

#api_settings ⇒ Hash

Return a hash of API settings derived first from ENV if set, then Sensu config ‘api` scope if configured, and finally falling back to to ipv4 localhost address on default API port.

Returns:

  • (Hash) 


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# File 'lib/sensu-plugin/utils.rb', line 198

def api_settings
  return @api_settings if @api_settings
  if ENV['SENSU_API_URL']
    uri = URI(ENV['SENSU_API_URL'])
    ssl = uri.scheme == 'https' ? {} : nil
    @api_settings = {
      'ssl' => ssl,
      'host' => uri.host,
      'port' => uri.port,
      'user' => uri.user,
      'password' => uri.password
    }
  else
    @api_settings = settings['api'] || {}
    @api_settings['host'] ||= '127.0.0.1'
    @api_settings['port'] ||= 4567
  end
  @api_settings
end

#api_settings=(api_settings) ⇒ Hash

Override API settings (for testing purposes)

Parameters:

  • api_settings (Hash)

Returns:

  • (Hash) 


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# File 'lib/sensu-plugin/utils.rb', line 189

def api_settings=(api_settings)
  @api_settings = api_settings
end

#cast_bool_values_int(value) ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 279

def cast_bool_values_int(value)
  case value
  when 'true', true
    1
  when 'false', false
    0
  else
    value
  end
end

#config_files ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 6

def config_files
  if ENV['SENSU_LOADED_TEMPFILE'] && File.file?(ENV['SENSU_LOADED_TEMPFILE'])
    IO.read(ENV['SENSU_LOADED_TEMPFILE']).split(':')
  elsif ENV['SENSU_CONFIG_FILES']
    ENV['SENSU_CONFIG_FILES'].split(':')
  else
    ['/etc/sensu/config.json'] + Dir['/etc/sensu/conf.d/**/*.json']
  end
end

#deep_merge(hash_one, hash_two) ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 265

def deep_merge(hash_one, hash_two)
  merged = hash_one.dup
  hash_two.each do |key, value|
    merged[key] = if hash_one[key].is_a?(Hash) && value.is_a?(Hash)
                    deep_merge(hash_one[key], value)
                  elsif hash_one[key].is_a?(Array) && value.is_a?(Array)
                    hash_one[key].concat(value).uniq
                  else
                    value
                  end
  end
  merged
end

#event ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 26

def event
  @event
end

#event=(value) ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 30

def event=(value)
  @event = value
end

#load_config(filename) ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 16

def load_config(filename)
  JSON.parse(File.open(filename, 'r').read)
rescue
  {}
end

#map_go_event_into_ruby(orig_event = nil, map_annotation = nil) ⇒ Object

Helper method to convert Sensu Go event into Sensu Ruby event

This is here to help keep Sensu Plugin community handlers working
until they natively support Go events
Takes Go event json object as argument
Returns event with Sensu Ruby mapping included

Note:
  The Sensu Ruby mapping overwrites some attributes so the resulting event cannot
  be used in a Sensu Go workflow. The top level boolean attribute "go_event_mapped_into_ruby"
  will be set to true as a hint to indicate this is a mapped event object.



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# File 'lib/sensu-plugin/utils.rb', line 57

def map_go_event_into_ruby(orig_event = nil, map_annotation = nil)
  orig_event ||= @event

  map_annotation ||= ENV['SENSU_MAP_ANNOTATION'] if ENV['SENSU_MAP_ANNOTATION']
  map_annotation ||= 'sensu.io.json_attributes'

  # return orig_event if already mapped
  return orig_event if orig_event['go_event_mapped_into_ruby']

  # Deep copy of orig_event
  event = Marshal.load(Marshal.dump(orig_event))

  # Trigger mapping code if enity exists and client does not
  client_missing = event['client'].nil? || event['client'].empty?
  if event.key?('entity') && client_missing
    ##
    # create the client hash from the entity hash
    ##
    event['client'] = event['entity']

    ##
    # Fill in missing client attributes
    ##

    event['client']['subscribers'] ||= event['entity']['subscriptions']

    ##
    #  Map entity metadata into client attributes
    #  Note this is potentially destructive as it may overwrite existing client attributes.
    ##
    if event['entity'].key?('metadata')
      ##
      #  Map metadata annotation 'name' to client name attribute
      ##
      event['client']['name'] ||= event['entity']['metadata']['name']

      ##
      #  Map special metadata annotation defined in map_annotation as json string and convert to client attributes
      #  Note this is potentially destructive as it may overwrite existing client attributes.
      ##
      if event['entity']['metadata'].key?('annotations') && event['entity']['metadata']['annotations'].key?(map_annotation)
        json_hash = JSON.parse(event['entity']['metadata']['annotations'][map_annotation])
        event['client'].update(json_hash)
      end
    end

    ##
    # Fill in renamed check attributes expected in Sensu Ruby event
    #   subscribers, source
    ##
    event['check']['subscribers'] ||= event['check']['subscriptions']
    event['check']['source'] ||= event['check']['proxy_entity_name']

    ##
    # Mimic Sensu Ruby event action based on Go event state
    #  action used in logs and fluentd plugins handlers
    ##
    action_state_mapping = {
      'flapping' => 'flapping',
      'passing' => 'resolve',
      'failing' => 'create'
    }

    state = event['check']['state'] || 'unknown::go_event'

    # Attempt to map Go event state to Sensu Ruby event action
    event['action'] ||= action_state_mapping[state.downcase]
    # Fallback action is Go event state
    event['action'] ||= state

    ##
    # Mimic Sensu Ruby event history based on Go event history
    #  Note: This overwrites the same history attribute
    #    Go history is an array of hashes, each hash includes status
    #    Sensu Ruby history is an array of statuses
    ##
    if event['check']['history']
      # Let's save the original history
      original_history = Marshal.load(Marshal.dump(event['check']['history']))
      event['check']['original_history'] = original_history
      legacy_history = []
      event['check']['history'].each do |h|
        legacy_history << h['status'].to_i.to_s || '3'
      end
      event['check']['history'] = legacy_history
    end

    ##
    #  Map check metadata into client attributes
    #  Note this is potentially destructive as it may overwrite existing check attributes.
    ##
    if event['check'].key?('metadata')
      ##
      #  Map metadata annotation 'name' to client name attribute
      ##
      event['check']['name'] ||= event['check']['metadata']['name']

      ##
      #  Map special metadata annotation defined in map_annotation as json string and convert to check attributes
      #  Note this is potentially destructive as it may overwrite existing check attributes.
      ##
      if event['check']['metadata'].key?('annotations') && event['check']['metadata']['annotations'].key?(map_annotation)
        json_hash = JSON.parse(event['check']['metadata']['annotations'][map_annotation])
        event['check'].update(json_hash)
      end
    end
    ##
    # Setting flag indicating this function has already been called
    ##
    event['go_event_mapped_into_ruby'] = true
  end
  # return the updated event
  event
end

#net_http_req_class(method) ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 172

def net_http_req_class(method)
  case method.to_s.upcase
  when 'GET'
    Net::HTTP::Get
  when 'POST'
    Net::HTTP::Post
  when 'DELETE'
    Net::HTTP::Delete
  when 'PUT'
    Net::HTTP::Put
  end
end

#paginated_get(path, options = {}) ⇒ Array

Use API query parameters to paginate HTTP GET requests, iterating over the results until an empty set is returned.

Parameters:

  • path (String)
  • options (Hash) (defaults to: {})

Returns:

  • (Array) 


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# File 'lib/sensu-plugin/utils.rb', line 243

def paginated_get(path, options = {})
  limit = options.fetch('limit', 500)
  offset = 0
  results = []
  loop do
    query_path = "#{path}?limit=#{limit}&offset=#{offset}"
    response = api_request(:GET, query_path)
    unless response.is_a?(Net::HTTPOK)
      unknown("Non-OK response from API query: #{get_uri(query_path)}")
    end
    data = JSON.parse(response.body)
    # when the data is empty, we have hit the end
    break if data.empty?
    # If API lacks pagination support, it will
    # return same data on subsequent iterations
    break if results.any? { |r| r == data }
    results << data
    offset += limit
  end
  results.flatten
end

#read_event(file) ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 34

def read_event(file)
  @event = ::JSON.parse(file.read)
  @event['occurrences'] ||= 1
  @event['check']       ||= {}
  @event['client']      ||= {}
rescue => e
  puts 'error reading event: ' + e.message
  exit 0
end

#settings ⇒ Object 



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# File 'lib/sensu-plugin/utils.rb', line 22

def settings
  @settings ||= config_files.map { |f| load_config(f) }.reduce { |a, b| deep_merge(a, b) }
end