Class: GmonPacket

Inherits:
Object
  • Object
show all
Defined in:
lib/logstash/inputs/ganglia/gmondpacket.rb

Instance Method Summary collapse

Constructor Details

#initialize(packet) ⇒ GmonPacket

Returns a new instance of GmonPacket.



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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 15

def initialize(packet)
  @xdr=XDR::Reader.new(StringIO.new(packet))

  # Read packet type
  type=@xdr.uint32
  case type
  when 128
    @type=:meta
  when 132
    @type=:heartbeat
  when 133..134
    @type=:data
  when 135
    @type=:gexec
  else
    @type=:unknown
  end
end

Instance Method Details

#data? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 38

def data?
  @type == :data
end

#heartbeat? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 34

def heartbeat?
  @type == :hearbeat
end

#meta? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 42

def meta?
  @type == :meta
end

#name_to_type(name, metadata) ⇒ Object

Does lookup of metricname in metadata table to find the correct type



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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 138

def name_to_type(name,metadata)
  # Lookup this metric metadata
  meta=metadata[name]
  return nil if meta.nil?

  return meta['type']
end

#parse_data(metadata) ⇒ Object

Parsing a data packet : type 133..135 Requires metadata to be available for correct parsing of the value



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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 87

def parse_data(metadata)
  data=Hash.new
  data['hostname']=@xdr.string

  metricname=@xdr.string
  data['name']=metricname

  data['spoof']=@xdr.uint32
  data['format']=@xdr.string

  metrictype=name_to_type(metricname,metadata)

  if metrictype.nil?
    # Probably we got a data packet before a metadata packet
    #puts "Received datapacket without metadata packet"
    return nil
  end

  data['val']=parse_value(metrictype)

  # If we received a packet, last update was 0 time ago
  data['tn']=0
  return data
end

#parse_metadata ⇒ Object

Parsing a metadata packet : type 128



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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 47

def parse_metadata
  meta=Hash.new
  meta['hostname']=@xdr.string
  meta['name']=@xdr.string
  meta['spoof']=@xdr.uint32
  meta['type']=@xdr.string
  meta['name2']=@xdr.string
  meta['units']=@xdr.string
  slope=@xdr.uint32

  case slope
  when 0
    meta['slope']= 'zero'
  when 1
    meta['slope']= 'positive'
  when 2
    meta['slope']= 'negative'
  when 3
    meta['slope']= 'both'
  when 4
    meta['slope']= 'unspecified'
  end

  meta['tmax']=@xdr.uint32
  meta['dmax']=@xdr.uint32
  nrelements=@xdr.uint32
  meta['nrelements']=nrelements
  unless nrelements.nil?
    extra={}
    for i in 1..nrelements
      name=@xdr.string
      extra[name]=@xdr.string
    end
    meta['extra']=extra
  end
  return meta
end

#parse_value(type) ⇒ Object

Parsing a specific value of type github.com/ganglia/monitor-core/blob/master/gmond/gmond.c#L1527



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# File 'lib/logstash/inputs/ganglia/gmondpacket.rb', line 114

def parse_value(type)
  value=:unknown
  case type
  when "int16"
    value=@xdr.int16
  when "uint16"
    value=@xdr.uint16
  when "uint32"
    value=@xdr.uint32
  when "int32"
    value=@xdr.int32
  when "float"
    value=@xdr.float32
  when "double"
    value=@xdr.float64
  when "string"
    value=@xdr.string
  else
    #puts "Received unknown type #{type}"
  end
  return value
end