Class: EC2APIProxy::Proxy

Inherits:
EM::Connection
  • Object
show all
Defined in:
lib/ec2-api-proxy/proxy.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ Proxy 



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# File 'lib/ec2-api-proxy/proxy.rb', line 13

def initialize(options)
  @options = options
  @memcached = Dalli::Client.new(options[:memcached], :compress => options[:compress])
  @logger = Logger.new($stdout)
end

Instance Attribute Details

#logger ⇒ Object (readonly)

Returns the value of attribute logger.



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# File 'lib/ec2-api-proxy/proxy.rb', line 10

def logger
  @logger
end

#memcached ⇒ Object (readonly)

Returns the value of attribute memcached.



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# File 'lib/ec2-api-proxy/proxy.rb', line 11

def memcached
  @memcached
end

#options ⇒ Object (readonly)

Returns the value of attribute options.



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# File 'lib/ec2-api-proxy/proxy.rb', line 9

def options
  @options
end

Instance Method Details

#post_init ⇒ Object 



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# File 'lib/ec2-api-proxy/proxy.rb', line 19

def post_init
  if (peername = get_peername)
    @connect_from = Socket.unpack_sockaddr_in(peername)
  end

  if @options[:debug]
    port, ip = @connect_from
    @logger.debug("proxy: connect from #{ip}:#{port}")
  end
end

#receive_data(data) ⇒ Object 



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# File 'lib/ec2-api-proxy/proxy.rb', line 39

def receive_data(data)
  EM.defer {
    begin
      endpoint, params = parse_proxy_request(data)
      key = params_to_key(params)

      if (cache = @memcached.get(key))
        @logger.debug("proxy: cache hit (length=#{cache.length})") if @options[:debug]
        send_data(cache)
        close_connection_after_writing
      else
        @logger.debug("proxy: cache miss") if @options[:debug]
        @backend = EM.connect(endpoint.host, endpoint.port, EC2APIProxy::Backend, self, key)

        if @backend.error?
          @logger.error("proxy: backend connection error: #{data.inspect}")
          send_error('ec2-api-proxy-backend-connection-error', 'backend connection error')
          close_backend_connection
          close_connection_after_writing
        else
          @backend.send_data(data)
        end
      end
    rescue => e
      @logger.warn("#{e.class.name}: #{e.message}")
      send_error(e.class.name, e.message)
      close_backend_connection
      close_connection_after_writing
    end
  }
end

#unbind ⇒ Object 



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# File 'lib/ec2-api-proxy/proxy.rb', line 30

def unbind
  close_backend_connection

  if @options[:debug]
    port, ip = @connect_from
    @logger.debug("proxy: unbind connection from #{ip}:#{port}")
  end
end