Module: TraceView::Inst::MemCache

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

def self.included(cls)
  TraceView.logger.info '[traceview/loading] Instrumenting memcache' if TraceView::Config[:verbose]

  cls.class_eval do
    MEMCACHE_OPS.reject { |m| !method_defined?(m) }.each do |m|

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

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

      class_eval "alias #{m}_without_traceview #{m}"
      class_eval "alias #{m} #{m}_with_traceview"
    end
  end

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

Instance Method Details

#cache_get_with_traceview(server, cache_key) ⇒ Object 



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# File 'lib/traceview/inst/memcache.rb', line 85

def cache_get_with_traceview(server, cache_key)
  result = cache_get_without_traceview(server, cache_key)

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

  result
end

#get_multi_with_traceview(*args) ⇒ Object 



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# File 'lib/traceview/inst/memcache.rb', line 43

def get_multi_with_traceview(*args)
  return get_multi_without_traceview(args) unless TraceView.tracing?

  info_kvs = {}

  begin
    info_kvs[:Backtrace] = TraceView::API.backtrace if TraceView::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
    TraceView.logger.debug "[traceview/debug] Error collecting info keys: #{e.message}"
    TraceView.logger.debug e.backtrace
  end

  TraceView::API.trace('memcache', { :KVOp => :get_multi }, :get_multi) do
    values = get_multi_without_traceview(args)

    info_kvs[:KVHitCount] = values.length
    TraceView::API.log('memcache', 'info', info_kvs)

    values
  end
end

#request_setup_with_traceview(*args) ⇒ Object 



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# File 'lib/traceview/inst/memcache.rb', line 71

def request_setup_with_traceview(*args)
  if TraceView.tracing? && !TraceView.tracing_layer_op?(:get_multi)
    server, cache_key = request_setup_without_traceview(*args)

    info_kvs = { :KVKey => cache_key, :RemoteHost => server.host }
    info_kvs[:Backtrace] = TraceView::API.backtrace if TraceView::Config[:memcache][:collect_backtraces]
    TraceView::API.log('memcache', 'info', info_kvs)

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