Module: Oboe::Inst::MemCache

Includes:
API::Memcache
Defined in:
lib/oboe/inst/memcache.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/memcache.rb', line 9

def self.included(cls)
  Oboe.logger.info "[oboe/loading] Instrumenting memcache" if Oboe::Config[:verbose]

  cls.class_eval do
    MEMCACHE_OPS.reject { |m| not method_defined?(m) }.each do |m|

      define_method("#{m}_with_oboe") do |*args|
        report_kvs = { :KVOp => m }
        report_kvs[:Backtrace] = Oboe::API.backtrace if Oboe::Config[:memcache][:collect_backtraces]

        if Oboe.tracing?
          Oboe::API.trace('memcache', report_kvs) do
            result = send("#{m}_without_oboe", *args) 
          end
        else
          result = send("#{m}_without_oboe", *args) 
        end
        result
      end

      class_eval "alias #{m}_without_oboe #{m}"
      class_eval "alias #{m} #{m}_with_oboe"
    end
  end
    
  [:request_setup, :cache_get, :get_multi].each do |m|
    if ::MemCache.method_defined? :request_setup
      cls.class_eval "alias #{m}_without_oboe #{m}"
      cls.class_eval "alias #{m} #{m}_with_oboe"
    elsif Oboe::Config[:verbose]
      Oboe.logger.warn "[oboe/loading] Couldn't properly instrument Memcache: #{m}"
    end
  end
end

Instance Method Details

#cache_get_with_oboe(server, cache_key) ⇒ Object 



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# File 'lib/oboe/inst/memcache.rb', line 86

def cache_get_with_oboe(server, cache_key)
  result = cache_get_without_oboe(server, cache_key)

  info_kvs = { :KVHit => memcache_hit?(result) }
  info_kvs[:Backtrace] = Oboe::API.backtrace if Oboe::Config[:memcache][:collect_backtraces]
  Oboe::API.log('memcache', 'info', info_kvs)

  result
end

#get_multi_with_oboe(*args) ⇒ Object 



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

def get_multi_with_oboe(*args)
  return get_multi_without_oboe(args) unless Oboe.tracing?
    
  info_kvs = {}
    
  begin
    info_kvs[:Backtrace] = Oboe::API.backtrace if Oboe::Config[:memcache][:collect_backtraces]
     
    if args.last.is_a?(Hash) || args.last.nil?
      info_kvs[:KVKeyCount] = args.flatten.length - 1
    else
      info_kvs[:KVKeyCount] = args.flatten.length 
    end
  rescue StandardError => e
    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(args)
    
    info_kvs[:KVHitCount] = values.length
    Oboe::API.log('memcache', 'info', info_kvs)
    
    values 
  end
end

#request_setup_with_oboe(*args) ⇒ Object 



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# File 'lib/oboe/inst/memcache.rb', line 72

def request_setup_with_oboe(*args)
  if Oboe.tracing? and not Oboe::Context.tracing_layer_op?(:get_multi)
    server, cache_key = request_setup_without_oboe(*args)
    
    info_kvs = { :KVKey => cache_key, :RemoteHost => server.host }
    info_kvs[:Backtrace] = Oboe::API.backtrace if Oboe::Config[:memcache][:collect_backtraces]
    Oboe::API.log('memcache', 'info', info_kvs)

    [server, cache_key]
  else
    request_setup_without_oboe(*args) 
  end
end