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dispatcher.py
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dispatcher.py
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import struct
from server_connection import ServerConnection
from log_optional import Logger
import queue
from multiprocessing import Queue
import time
import datetime
import select
import socket
from messages.server.CM_TEST import CM_TEST
from messages.server.SM_PONG import SM_PONG
from messages.server.client_message import ClientMessage
from multiprocessing.reduction import rebuild_handle
def run(idx, client_queue, debug):
logger=Logger(debug)
logger.log("Start dispatcher {0}".format(idx))
inputs = []
outputs=[]
server_connections = {}
while True:
#add new client to input list
start_ = datetime.datetime.now()
try:
h = client_queue.get_nowait()
fd=rebuild_handle(h)
client=socket.fromfd(fd,socket.AF_INET,socket.SOCK_STREAM)
except queue.Empty:
pass
except Exception as ex:
logger.log(ex)
else:
logger.log('Dispatcher {0} got new client {1}'.format(idx, client.getpeername()))
inputs.append(client)
sc = ServerConnection(client)
server_connections[client]=sc
if not inputs:
continue
logger.log('Dispatcher {0}: inputs={1}, outputs={2}'.format(idx, len(inputs), len(outputs)))
readable,writable,exceptional = select.select(inputs, outputs, inputs)
logger.log('Dispatcher {0}: readable {1}, writable {2}, exceptions {3}'.format(idx, len(readable), len(writable), len(exceptional)))
for client in readable:
try:
logger.log('Dispatcher {0} read data from client {1}'.format(idx, client.getpeername()))
messages = read(idx, server_connections[client], logger)
logger.log('Dispatcher{0}: processed {1} messages'.format(idx, len(messages)))
messages = process_messages(messages)
add_messages_to_write_buffer(idx, server_connections[client], messages, logger)
dummy_messages(server_connections[client])
if not client in outputs:
logger.log('Dispatcher {0}: add client {1} to write select list'.format(idx, client))
outputs.append(client)
logger.log('Dispatcher {0}: exit read for client {1}'.format(idx, client.getpeername()))
except socket.error as error:
logger.log(repr(error))
inputs.remove(client)
# TODO handle message queue
except ValueError as error:
logger.log('Client {0} disconnected'.format(client.getpeername()))
if client in outputs:
outputs.remove(client)
if client in inputs:
inputs.remove(client)
client.close()
del server_connections[client]
else:
if client not in outputs:
outputs.append(client)
for client in writable:
try:
if client in server_connections:
write(idx, server_connections[client], logger)
if len(server_connections[client].write_buffer)==0:
logger.log('Dispatcher {0}: write buffer for client {1} is empty'.format(idx, client))
outputs.remove(client)
except socket.error as error:
logger.log(repr(error))
inputs.remove(client)
# TODO handle message queue
except ValueError as error:
logger.log('Client {0} disconnected'.format(client.getpeername()))
if client in outputs:
outputs.remove(client)
if client in inputs:
inputs.remove(client)
client.close()
del server_connections[client]
# Handle "exceptional conditions"
for client in exceptional:
logger.log('Handling exceptional condition for'.format(client.getpeername()))
# Stop listening for input on the connection
inputs.remove(client)
outputs.remove(client)
client.close()
end_ = datetime.datetime.now()
logger.log('Dispatcher {0}: loop took {1} ms'.format(idx, (end_-start_).microseconds/1000))
def read(idx, server_connection, logger):
connection=server_connection.connection
data = connection.recv(2048)
read_messages = []
logger.log("Dispatcher {0}: buffer={1}".format(idx, server_connection.buffer))
logger.log("Dispatcher {0}: read {1} bytes".format(idx, len(data)))
logger.log("Dispatcher {0}: read {1}".format(idx, data))
if not data:
raise ValueError('Client disconnected')
server_connection.buffer.extend(data)
length=0
opcode=0
message_data=0
while server_connection.position<len(server_connection.buffer):
left = len(server_connection.buffer)-server_connection.position
logger.log("Dispatcher {0}: left={1}".format(idx, left))
#ima header
if left>=5:
length = struct.unpack_from('<I', server_connection.buffer, server_connection.position)[0]
server_connection.position+=ClientMessage.INT_SIZE
opcode = struct.unpack_from('<B', server_connection.buffer, server_connection.position)[0]
server_connection.position+=ClientMessage.BYTE_SIZE
#ima i podataka
if left-ClientMessage.INT_SIZE+ClientMessage.BYTE_SIZE>=length:
start = ClientMessage.INT_SIZE+ClientMessage.BYTE_SIZE
messageData = server_connection.buffer[start:length+start];
server_connection.position+=length
logger.log("Dispatcher {0}: read message, opcode={1}, length={2} data={3}".format(idx, opcode, length, messageData))
logger.log("Dispatcher {0}: at position: {1}".format(idx, server_connection.position))
read_messages.append({"opcode":opcode, "data":messageData, "client":server_connection.id})
if len(server_connection.buffer)>length+start:
logger.log("Dispatcher {0}: probably got parts of new message. Put it in buffer".format(idx))
logger.log("Dispatcher {0}: current buffer={1}".format(idx, server_connection.buffer))
tmp = server_connection.buffer[length+start:len(server_connection.buffer)]
server_connection.buffer=bytearray()
server_connection.buffer.extend(tmp)
server_connection.position=0
logger.log("Dispatcher {0}: current buffer length is {1}".format(idx, len(server_connection.buffer)))
else:
logger.log("Dispatcher {0}: reset buffer".format(idx))
server_connection.position=0
server_connection.buffer=bytearray()
break;
# TODO: implement raising of message receive event
#notifyClientReceivedListeners(opcode, messageData, connection.getClientID());
#nema podataka pa utrpaj ostatak u buffer
else:
logger.log("Dispatcher {0}: opcode={1}, length={2}. Whole message not yet received".format(idx, opcode, length))
logger.log("Dispatcher {0}: at position: {1}".format(idx, server_connection.position))
logger.log("Dispatcher {0}: message not complete, put received back to buffer".format(idx))
server_connection.position=0
break
#nema headera, utrpaj ostatak u buffer
else:
logger.log("Dispatcher {0}: message not complete, put received back to buffer".format(idx))
break
logger.log("Dispatcher {0}: buffer: {1}".format(idx, server_connection.buffer))
return read_messages
def write(idx, server_connection, logger):
if len(server_connection.write_buffer)!=0:
sent = server_connection.connection.send(server_connection.write_buffer)
logger.log('Dispatcher {0}: sent {1} bytes to client {2}'.format(idx, sent, server_connection.connection))
#if not all buffer was sent then compact array
if sent!=len(server_connection.write_buffer):
#compact buffer
server_connection.write_buffer=server_connection.write_buffer[sent: len(server_connection.write_buffer)]
logger.log('Dispatcher {0}: not whole buffer was sent for client {1}'.format(idx, server_connection.connection))
elif sent==0:
raise ValueError('Client disconnected')
else:
logger.log('Dispatcher {0}: whole buffer was sent for client {1}'.format(idx, server_connection.connection))
server_connection.write_buffer=bytearray()
else:
logger.log('Dispatcher {0}: write buffer for client {1} is empty'.format(idx, server_connection.connection))
def add_messages_to_write_buffer(idx, server_connection, messages, logger):
for message in messages:
logger.log("Dispatcher {0}: send message {1}".format(idx,message))
client=server_connection.connection
buffer = bytearray()
buffer.extend(struct.pack('<I', len(message.get_data())))
buffer.extend(struct.pack('<B', type(message).OP_CODE))
buffer.extend(message.get_data())
logger.log("Dispatcher {0}: add {1} to write buffer for client {1}".format(idx, buffer, client))
write_buffer = server_connection.write_buffer
write_buffer.extend(buffer)
logger.log("Dispatcher {0}: write buffer for {1} is {2}".format(idx, client, write_buffer))
def process_messages(messages):
#return SM_TEST(33, True, 1234567890, 22, 3.5, 310.55, 'Jadrejcic', -1, Pong('You pinged?'))
smessages = []
for message in messages:
smessages.append(SM_PONG("a"*32))
return smessages
def dummy_messages(server_connection):
buffer = bytearray()
buffer.extend(struct.pack('<I', 41))
buffer.extend(struct.pack('<B', 26))
buffer.extend(struct.pack('<I', 32))
buffer.extend(("a"*32).encode('utf-8'))
write_buffer = server_connection.write_buffer
write_buffer.extend(buffer)