Module: Oboe::Inst::Dalli

Includes:
API::Memcache
Defined in:
lib/oboe/inst/dalli.rb

Constant Summary

Constants included from API::Memcache

API::Memcache::MEMCACHE_OPS

Class Method Summary collapse

Instance Method Summary collapse

Methods included from API::Memcache

#memcache_hit?, #remote_host

Class Method Details

.included(cls) ⇒ Object 



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# File 'lib/oboe/inst/dalli.rb', line 9

def self.included(cls)
  cls.class_eval do
    Oboe.logger.info "[oboe/loading] Instrumenting memcache (dalli)" if Oboe::Config[:verbose]
    if ::Dalli::Client.private_method_defined? :perform
      alias perform_without_oboe perform
      alias perform perform_with_oboe
    else Oboe.logger.warn "[oboe/loading] Couldn't properly instrument Memcache (Dalli).  Partial traces may occur."
    end

    if ::Dalli::Client.method_defined? :get_multi
      alias get_multi_without_oboe get_multi
      alias get_multi get_multi_with_oboe
    end
  end
end

Instance Method Details

#get_multi_with_oboe(*keys) ⇒ Object 



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# File 'lib/oboe/inst/dalli.rb', line 44

def get_multi_with_oboe(*keys)
  return get_multi_without_oboe(keys) unless Oboe.tracing?
    
  info_kvs = {}
    
  begin
    info_kvs[:KVKeyCount] = keys.flatten.length 
    info_kvs[:KVKeyCount] = (info_kvs[:KVKeyCount] - 1) if keys.last.is_a?(Hash) || keys.last.nil?
  rescue
    Oboe.logger.debug "[oboe/debug] Error collecting info keys: #{e.message}"
    Oboe.logger.debug e.backtrace
  end

  Oboe::API.trace('memcache', { :KVOp => :get_multi }, :get_multi) do
    values = get_multi_without_oboe(keys)
    
    info_kvs[:KVHitCount] = values.length
    info_kvs[:Backtrace] = Oboe::API.backtrace if Oboe::Config[:dalli][:collect_backtraces]
    Oboe::API.log('memcache', 'info', info_kvs)

    values 
  end
end

#perform_with_oboe(*all_args, &blk) ⇒ Object 



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# File 'lib/oboe/inst/dalli.rb', line 25

def perform_with_oboe(*all_args, &blk)
  op, key, *args = *all_args
  
  if Oboe.tracing? and not Oboe::Context.tracing_layer_op?(:get_multi)
    Oboe::API.trace('memcache', { :KVOp => op, :KVKey => key }) do
      result = perform_without_oboe(*all_args, &blk)

      info_kvs = {}
      info_kvs[:KVHit] = memcache_hit?(result) if op == :get and key.class == String
      info_kvs[:Backtrace] = Oboe::API.backtrace if Oboe::Config[:dalli][:collect_backtraces]
      
      Oboe::API.log('memcache', 'info', info_kvs) unless info_kvs.empty?
      result
    end
  else
    perform_without_oboe(*all_args, &blk)
  end
end