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# Pyrogram - Telegram MTProto API Client Library for Python

# Copyright (C) 2017-2019 Dan Tès <https://github.com/delivrance>

#

# This file is part of Pyrogram.

#

# Pyrogram is free software: you can redistribute it and/or modify

# it under the terms of the GNU Lesser General Public License as published

# by the Free Software Foundation, either version 3 of the License, or

# (at your option) any later version.

#

# Pyrogram is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

# GNU Lesser General Public License for more details.

#

# You should have received a copy of the GNU Lesser General Public License

# along with Pyrogram. If not, see <http://www.gnu.org/licenses/>.

import logging

import threading

import time

from .transport import *

from ..session.internals import DataCenter

log = logging.getLogger(__name__)

class Connection:

MAX_RETRIES = 3

MODES = {

0: TCPFull,

1: TCPAbridged,

2: TCPIntermediate,

3: TCPAbridgedO,

4: TCPIntermediateO

}

def __init__(self, dc_id: int, test_mode: bool, ipv6: bool, proxy: dict, mode: int = 3):

self.dc_id = dc_id

self.test_mode = test_mode

self.ipv6 = ipv6

self.proxy = proxy

self.address = DataCenter(dc_id, test_mode, ipv6)

self.mode = self.MODES.get(mode, TCPAbridged)

self.lock = threading.Lock()

self.connection = None

def connect(self):

for i in range(Connection.MAX_RETRIES):

self.connection = self.mode(self.ipv6, self.proxy)

try:

log.info("Connecting...")

self.connection.connect(self.address)

except OSError as e:

log.warning(e) # TODO: Remove

self.connection.close()

time.sleep(1)

else:

log.info("Connected! {} DC{} - IPv{} - {}".format(

"Test" if self.test_mode else "Production",

self.dc_id,

"6" if self.ipv6 else "4",

self.mode.__name__

))

break

else:

log.warning("Connection failed! Trying again...")

raise TimeoutError

def close(self):

self.connection.close()

log.info("Disconnected")

def send(self, data: bytes):

with self.lock:

self.connection.sendall(data)

def recv(self) -> bytes or None:

return self.connection.recvall()