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protocol.py
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protocol.py
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"""Protocol for node - Computação Distribuida Final Project"""
import json
from datetime import datetime
from socket import socket
class Message:
"""Message Type."""
def __init__(self, command):
"""Initialize message with command"""
self.command = command
self._timestamp = int(datetime.now().timestamp())
self._msg = None
def toJson(self, dict: dict):
self._msg = json.dumps(dict)
@property
def timestamp(self) -> datetime:
"""Retrieve message timestamp."""
return self._timestamp
def __str__(self):
return self._msg
class JoinMessage(Message):
"""Message to join the network."""
def __init__(self, bindPoint, reply, ip):
super().__init__("join")
self.channel = bindPoint
self.reply = reply
self.ip = ip
# fzr a convertion para json
msg = {
"command": self.command,
"bindPoint": self.channel,
"reply": self.channel,
"ip": self.channel,
}
self.toJson(msg)
def __str__(self):
return self._msg
class JoinReply(Message):
"""Message with all needed info to join the network."""
def __init__(self, bindPoint, ip, data):
super().__init__("join_reply")
self.bindPoint = bindPoint
self.ip = ip
self.data = data
msg = {
"command": self.command,
"bindPoint": self.bindPoint,
"data": self.data,
"ip": self.ip
}
self.toJson(msg)
def __str__(self):
return self._msg
class AskToSolve(Message):
"""Message to ask for avability to solve a sudoku."""
def __init__(self):
super().__init__("agToSolve")
msg = {
"command": self.command
}
self.toJson(msg)
def __str__(self):
return self._msg
class Solve(Message):
"""Message to solve a subproblem."""
def __init__(self, task, taskid):
super().__init__("solve")
self.sudoku = task
self.taskid = taskid
msg = {
"command": self.command,
"sudoku": self.sudoku,
"sudokuId": self.taskid
}
self.toJson(msg)
class Network(Message):
"""Message to ask for the network connections."""
def __init__(self):
super().__init__("network")
msg = {"command": self.command}
self.toJson(msg)
class NetworkUpdate(Message):
"""Message to update the network."""
def __init__(self, network, validations):
super().__init__("update_network")
self.network = network
self.validations = validations
msg = {"command": self.command,
"network": self.network,
"validations": self.validations
}
self.toJson(msg)
class Solution(Message):
"""Message to send a solution to a sudoku."""
def __init__(self, sudoku, sudokuId, solution):
super().__init__("solution")
self.sudoku = sudoku
self.sudokuId = sudokuId
self.solution = solution
msg = {
"command": self.command,
"sudoku": self.sudoku,
"sudokuId": self.sudokuId,
"solution": self.solution
}
self.toJson(msg)
class Stop(Message):
"""Message to stop solving a sudoku."""
def __init__(self, sudokuId):
super().__init__("stop")
self.sudokuId = sudokuId
msg = {
"command": self.command,
"sudokuId": self.sudokuId
}
self.toJson(msg)
class KeepAlive(Message):
"""Message to ask for node ping."""
def __init__(self, solved, validations, IP):
super().__init__("keep_alive")
self.solved = solved
self.validations = validations
self.IP = IP
msg = {
"command": self.command,
"status": {
"solved": self.solved,
"validations": self.validations,
},
"IP": self.IP
}
self.toJson(msg)
class KeepAliveReply(Message):
"""Message to confirm node ping."""
def __init__(self, task, taskid):
super().__init__("keep_alive_reply")
self.sudoku = task
self.taskid = taskid
msg = {"command": self.command}
self.toJson(msg)
class CDProto:
"""Computação Distribuida Protocol."""
@classmethod
def join(cls, bindPoint, reply, ip):
"""Join the network."""
return JoinMessage(bindPoint, reply, ip)
@classmethod
def join_reply(cls, bindPoint, ip, data):
"""Reply to a join message."""
return JoinReply(bindPoint, ip, data)
@classmethod
def ask_to_solve(cls):
"""Ask for avability to solve a sudoku."""
return AskToSolve()
@classmethod
def solve(cls, task, taskid):
"""Solve a sudoku."""
return Solve(task, taskid)
@classmethod
def network(cls):
"""Ask for the network connections."""
return Network()
@classmethod
def network_update(cls, network, validations):
"""Update the network."""
return NetworkUpdate(network, validations)
@classmethod
def solution(cls, sudoku, sudokuId, solution):
"""Send a solution to a sudoku."""
return Solution(sudoku, sudokuId, solution)
@classmethod
def stop(cls, sudokuId):
"""Stop solving a sudoku."""
return Stop(sudokuId)
@classmethod
def keep_alive(cls, solved, validations, IP):
"""Ask for node ping."""
return KeepAlive(solved, validations, IP)
@classmethod
def keep_alive_reply(cls, task, taskid):
"""Confirm node ping."""
return KeepAliveReply(task, taskid)
@classmethod
def send_msg(cls, connection: socket, msg: Message):
"""Sends through a connection a Message object."""
convertedMsg = msg.__str__().encode('utf-8')
msgLen = len(convertedMsg) # NOTE: definir o tamanho da mensagem
header = msgLen.to_bytes(2, byteorder="big")
try:
# tentar enviar a mensagem
# NOTE: o send all é para garantir que a mensagem é enviada toda de uma vez
connection.sendall(header + convertedMsg)
except BrokenPipeError:
raise CDProtoBadFormat(convertedMsg)
@classmethod
def recv_msg(cls, connection: socket) -> Message:
"""Receives through a connection a Message object."""
header = connection.recv(2)
msgLen = int.from_bytes(header, "big") # NOTE: convereter os bytes para int
if not msgLen:
# NOTE: se a mensagem não tiver tamanho, então não é uma mensagem válida
return None
msg = connection.recv(msgLen).decode('utf-8')
# NOTE: tentar decodificar a mensagem
try:
# NOTE: tentar fazer o parse da mensagem
encodedMsg = json.loads(msg)
except json.JSONDecodeError:
raise CDProtoBadFormat(msg)
if encodedMsg["command"] == "join":
return JoinMessage(encodedMsg["bindPoint"], encodedMsg["reply"], encodedMsg["ip"])
elif encodedMsg["command"] == "join_reply":
return JoinReply(encodedMsg["bindPoint"], encodedMsg["ip"], encodedMsg["data"])
elif encodedMsg["command"] == "ask_to_solve":
return AskToSolve()
elif encodedMsg["command"] == "solve":
return Solve(encodedMsg["sudoku"], encodedMsg["sudokuId"])
elif encodedMsg["command"] == "network":
return Network()
elif encodedMsg["command"] == "update_network":
return NetworkUpdate(encodedMsg["network"], encodedMsg["validations"])
elif encodedMsg["command"] == "solution":
return Solution(encodedMsg["sudoku"], encodedMsg["sudokuId"], encodedMsg["solution"])
elif encodedMsg["command"] == "stop":
return Stop(encodedMsg["sudokuId"])
elif encodedMsg["command"] == "keep_alive":
return KeepAlive(encodedMsg["status"]["solved"], encodedMsg["status"]["validations"], encodedMsg["IP"])
elif encodedMsg["command"] == "keep_alive_reply":
return KeepAliveReply(encodedMsg["sudoku"], encodedMsg["sudokuId"])
else:
raise CDProtoBadFormat(msg)
class CDProtoBadFormat(Exception):
"""Exception when source message is not CDProto."""
def __init__(self, original_msg: bytes=None) :
"""Store original message that triggered exception."""
self._original = original_msg
@property
def original_msg(self) -> str:
"""Retrieve original message as a string."""
return self._original.decode("utf-8")