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# Pyrogram - Telegram MTProto API Client Library for Python

# Copyright (C) 2017-present Dan <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 asyncio

import logging

from typing import Optional

from .transport import TCP, TCPAbridged

from ..session.internals import DataCenter

log = logging.getLogger(__name__)

class Connection:

MAX_CONNECTION_ATTEMPTS = 3

def __init__(self, dc_id: int, test_mode: bool, ipv6: bool, proxy: dict, media: bool = False):

self.dc_id = dc_id

self.test_mode = test_mode

self.ipv6 = ipv6

self.proxy = proxy

self.media = media

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

self.protocol: TCP = None

async def connect(self):

for i in range(Connection.MAX_CONNECTION_ATTEMPTS):

self.protocol = TCPAbridged(self.ipv6, self.proxy)

try:

log.info("Connecting...")

await self.protocol.connect(self.address)

except OSError as e:

log.warning("Unable to connect due to network issues: %s", e)

await self.protocol.close()

await asyncio.sleep(1)

else:

log.info("Connected! %s DC%s%s - IPv%s",

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

self.dc_id,

" (media)" if self.media else "",

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

break

else:

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

raise ConnectionError

async def close(self):

await self.protocol.close()

log.info("Disconnected")

async def send(self, data: bytes):

await self.protocol.send(data)

async def recv(self) -> Optional[bytes]:

return await self.protocol.recv()