Class: Pandemic::ServerSide::Client

Inherits:
Object
  • Object
show all
Includes:
Util
Defined in:
lib/pandemic/server_side/client.rb

Defined Under Namespace

Classes: DisconnectClient

Constant Summary collapse

REQUEST_FLAGS = 
{:async => 'a'}
EMPTY_STRING = 
""
REQUEST_REGEXP = 
/^([0-9]+)(?: ([#{REQUEST_FLAGS.values.join('')}]*))?$/

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Util

#host_port, #logger, #with_mutex

Constructor Details

#initialize(connection, server) ⇒ Client

Returns a new instance of Client.



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# File 'lib/pandemic/server_side/client.rb', line 12

def initialize(connection, server)
  @connection = connection
  @server = server
  @received_requests = 0
  @responded_requests = MutexCounter.new                                                             
  @current_request = nil
end

Instance Attribute Details

#received_requests ⇒ Object

Returns the value of attribute received_requests.



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# File 'lib/pandemic/server_side/client.rb', line 10

def received_requests
  @received_requests
end

#responded_requests ⇒ Object

Returns the value of attribute responded_requests.



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# File 'lib/pandemic/server_side/client.rb', line 10

def responded_requests
  @responded_requests
end

Instance Method Details

#close ⇒ Object 



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# File 'lib/pandemic/server_side/client.rb', line 83

def close
  @listener_thread.raise(DisconnectClient)
end

#handle_request(request) ⇒ Object 



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# File 'lib/pandemic/server_side/client.rb', line 89

def handle_request(request)
  @current_request = Request.new(request)
  response = begin
    @server.handle_client_request(@current_request)
  rescue Exception => e
    warn("Unhandled exception in handle client request:\n#{e.inspect}\n#{e.backtrace.join("\n")}")
    nil
  end
  @current_request = nil
  return response
end

#listen ⇒ Object 



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# File 'lib/pandemic/server_side/client.rb', line 20

def listen
  unless @connection.nil?
    @listener_thread.kill if @listener_thread
    @listener_thread = Thread.new do
      begin
        while @server.running
          # debug("Waiting for incoming request")
          request = @connection.gets
          # info("Received incoming request")
          @received_requests += 1
          
          if request.nil?
            # debug("Incoming request is nil")
            @connection.close
            @connection = nil
            break
          elsif request.strip! =~ REQUEST_REGEXP
            size, flags = $1.to_i, $2.to_s.split(EMPTY_STRING)
            # debug("Reading request body (size #{size})")
            body = @connection.read(size)
            # debug("Finished reading request body")
            if flags.include?(REQUEST_FLAGS[:async])
              Thread.new do
                handle_request(body)
                @responded_requests.inc
              end
            else
              response = handle_request(body)
              if response
                # debug("Writing response to client")

                # the connection could be closed, we'll let it be rescued if it is.
                @connection.write("#{response.size}\n#{response}")
                @connection.flush
                # debug("Finished writing response to client")
              else
                # debug("Writing error code to client")
                
                @connection.write("-1\n")
                @connection.flush
                # debug("Finished writing error code to client")
              end
              @responded_requests.inc
            end
          end
        end
      rescue DisconnectClient
        info("Closing client connection")
        close_connection
      rescue Errno::EPIPE
        info("Connection to client lost")
        close_connection
      rescue Exception => e
        warn("Unhandled exception in client listen thread:\n#{e.inspect}\n#{e.backtrace.join("\n")}")
      ensure
        @current_request.cancel! if @current_request
        @server.client_closed(self)
      end
    end
  end
  return self
end