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_validation_names_by_regex(tree, key) ⇒ Object 



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 95

def find_validation_names_by_regex(tree, key)
  split_key = split_on_slash(key, 2)
  selector = split_key.first

  stat_name_matches = []
  regexp = /#{selector}/

  tree.each do |k, v|
    if regexp.match(k) do
        if v.kind_of? Hash
          find_validation_names_by_regex(v, split_key.last).each do |s|
            stat_name_matches << "#{k}/#{s}"
          end
        elsif split_key.size == 1 #This is the last match
          stat_name_matches << k
        end
      end
    end
  end
  stat_name_matches
end

#find_value(map, key) ⇒ Object 



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 117

def find_value(map, key)
  tree = map
  split_on_slash(key).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 84

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

#split_on_slash(key, *limit) ⇒ Object

split on a slash, unless it’s escaped



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# File 'lib/ostrichpoll/ostrich_validator.rb', line 89

def split_on_slash(key, *limit)
  key.split(/(?<!\\)\//, *limit).map do |str|
      str.sub('\\', '')
  end
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 rescue (
    error_msg = "Unable to connect to host #{uri}"
    Log.error error_msg
    return ExitStatus.new(error_msg, 1)
  )

  # parse response
  json = JSON.parse(response) rescue (
    error_msg = "Invalid JSON response: #{response}"
    Log.error error_msg
    return ExitStatus.new(error_msg, 1)
  )

  @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
  
  retval = nil

  # execute each validation:
  if validations
    matched_validations = []
    validations.each do |v|
      if(v.regex)
        find_validation_names_by_regex(json, v.metric).each do |n|
          matched_validator = v.clone
          matched_validator.metric = n
          matched_validations << matched_validator
        end
      else
        matched_validations << v
      end
    end

    matched_validations.each do |v|
      value = v.check(find_value(json, v.metric))
      retval = value if retval.nil?
    end
  end

  retval
end