Class: MemcacheStats

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(config, logger = nil) ⇒ MemcacheStats

Returns a new instance of MemcacheStats.



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# File 'lib/memcachestats.rb', line 9

def initialize(config, logger = nil)
  @config = config
  
  initialize_log unless logger
  @log = logger if logger
  @log.error("Logging started")
  
  initialize_metrics
end

Instance Attribute Details

#config ⇒ Object

Returns the value of attribute config.



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# File 'lib/memcachestats.rb', line 5

def config
  @config
end

#connection ⇒ Object

Returns the value of attribute connection.



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# File 'lib/memcachestats.rb', line 5

def connection
  @connection
end

#counters ⇒ Object

Returns the value of attribute counters.



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# File 'lib/memcachestats.rb', line 7

def counters
  @counters
end

#gauges ⇒ Object

Returns the value of attribute gauges.



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# File 'lib/memcachestats.rb', line 7

def gauges
  @gauges
end

#host ⇒ Object

Returns the value of attribute host.



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# File 'lib/memcachestats.rb', line 5

def host
  @host
end

#log ⇒ Object

Returns the value of attribute log.



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# File 'lib/memcachestats.rb', line 5

def log
  @log
end

#metrics ⇒ Object

Returns the value of attribute metrics.



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# File 'lib/memcachestats.rb', line 7

def metrics
  @metrics
end

#stats ⇒ Object

Returns the value of attribute stats.



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# File 'lib/memcachestats.rb', line 7

def stats
  @stats
end

Instance Method Details

#add_derived_metrics(stats) ⇒ Object 



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# File 'lib/memcachestats.rb', line 187

def add_derived_metrics(stats)
  stats['get_hit_percentage'] = stats['get_hits_total'].to_f / (stats['get_hits_total'] + stats['get_misses_total'] + 1)
  stats['get_miss_percentage'] = stats['get_misses_total'].to_f / (stats['get_hits_total'] + stats['get_misses_total'] + 1)
  stats['delete_hit_percentage'] = stats['delete_hits_total'].to_f / (stats['delete_hits_total'] + stats['delete_misses_total'] + 1)
  stats['delete_miss_percentage'] = stats['delete_misses_total'].to_f / (stats['delete_hits_total'] + stats['delete_misses_total'] + 1)
  stats['used_percentage'] = stats['bytes'].to_i / (stats['limit_maxbytes'].to_f + 1)
end

#connect(host, port = '11211') ⇒ Object 



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# File 'lib/memcachestats.rb', line 159

def connect(host, port = '11211')
  return if @connection and ((@host == host) && (@port == port))
  
  @connection = TCPSocket.new(host, port)
  @host = host
  @port = port
end

#get_memcached_stats(host, port = '11211') ⇒ Object 



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# File 'lib/memcachestats.rb', line 167

def get_memcached_stats(host, port = '11211')
  @stats = {}
  matched = {}

  begin
    connect(host, port)

    @connection.puts("stats")

    while ((line = @connection.gets.chomp) != "END")
      if (matched = /STAT (?<key>\w+) (?<value>\d+)/.match(line))
        @stats[matched['key']] = matched['value']
        @stats["#{matched['key']}_total"] = matched['value'] if @gauges["#{matched['key']}_total"]
      end
    end
  rescue Exception => e
    pp ["ex", e]
  end
end

#initialize_log ⇒ Object 



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# File 'lib/memcachestats.rb', line 19

def initialize_log
  @config['log'] = {
     'file' => STDOUT,
     'level' => 'INFO'
   }.merge(@config['log'] || {})

   log_initialize = [@config['log']['file']]
   log_initialize << @config['log']['shift_age'] if @config['log']['shift_age']
   log_initialize << @config['log']['shift_size'] if @config['log']['shift_size']

   begin
     @log = Logger.new(*log_initialize)
     @log.level = Logger.const_get(@config['log']['level'])
   rescue Exception => e
     @config['log'] = {
       'file' => STDOUT,
       'level' => 'INFO'
     }
     @log = Logger.new(@config['log']['file'])
     @log.level = Logger.const_get(@config['log']['level'])
     @log.error("Caught a problem with log settings")
     @log.error("#{e.message}")
     @log.error("Setting log settings to defaults")
   end
end

#initialize_metrics ⇒ Object 



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# File 'lib/memcachestats.rb', line 45

def initialize_metrics
  @gauges = {
    'curr_connections' => {
      'units' => 'conn',
      'type' => 'uint32'
    },
    'curr_items' => {
      'units' => 'keys',
      'type' => 'double'
    },
    'threads' => {
      'units' => 'threads',
      'type' => 'uint32'
    },
    'bytes' => {
      'units' => 'bytes',
      'publish' => 'no'
    },
    'limit_maxbytes' => {
      'units' => 'bytes',
      'publish' => 'no'
    },
    'total_connections_total' => {
      'units' => 'conn',
      'publish' => 'no'
    },
    'total_items_total' => {
      'units' => 'key',
      'publish' => 'no'
    },
    'get_hits_total' => {
      'units' => 'r',
      'publish' => 'no'
    },
    'get_misses_total' => {
      'units' => 'r',
      'publish' => 'no'
    },
    'delete_misses_total' => {
      'units' => 'r',
      'publish' => 'no'
    },
    'delete_hits_total' => {
      'units' => 'r',
      'publish' => 'no'
    },
    'bytes_read_total' => {
      'units' => 'bytes',
      'publish' => 'no'
    },
    'bytes_written_total' => {
      'units' => 'bytes',
      'publish' => 'no'
    },
    "get_hit_percentage" => {
      'units' => '%',
      'type' => 'double'
    },
    "get_miss_percentage" => {
      'units' => '%',
      'type' => 'double'
    },
    "delete_hit_percentage" => {
      'units' => '%',
      'type' => 'double'
    },
    "delete_miss_percentage" => {
      'units' => '%',
      'type' => 'double'
    },
    "used_percentage" => {
      'units' => '%',
      'type' => 'double'
    }
  }
  
  @counters = {
    'total_connections' => {
      'units' => 'conn/s',
      'type' => 'uint32'
    },
    'total_items' => {
      'units' => 'keys/s',
      'type' => 'uint32'
    },
    'get_hits' => {
      'units' => 'r/s',
      'type' => 'uint32'
    },
    'get_misses' => {
      'units' => 'r/s',
      'type' => 'uint32'
    },
    'delete_misses' => {
      'units' => 'r/s',
      'type' => 'uint32'
    },
    'delete_hits' => {
      'units' => 'r/s',
      'type' => 'uint32'
    },
    'bytes_read' => {
      'units' => 'bytes/s',
      'type' => 'double'
    },
    'bytes_written' => {
      'units' => 'bytes/s',
      'type' => 'double'
    }
  }
  
  @metrics = @counters.merge(@gauges)
end