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# Pyrogram - Telegram MTProto API Client Library for Python
# Copyright (C) 2017-2021 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
import os
import time
from datetime import datetime, timedelta
from hashlib import sha1
from io import BytesIO
import pyrogram
from pyrogram import __copyright__, __license__, __version__
from pyrogram import raw
from pyrogram.connection import Connection
from pyrogram.crypto import mtproto
from pyrogram.errors import RPCError, InternalServerError, AuthKeyDuplicated, FloodWait
from pyrogram.raw.all import layer
from pyrogram.raw.core import TLObject, MsgContainer, Int, FutureSalt, FutureSalts
from .internals import MsgId, MsgFactory
log = logging.getLogger(__name__)
class Result:
def __init__(self):
self.value = None
self.event = asyncio.Event()
class Session:
INITIAL_SALT = 0x616e67656c696361
START_TIMEOUT = 1
WAIT_TIMEOUT = 15
SLEEP_THRESHOLD = 10
MAX_RETRIES = 5
ACKS_THRESHOLD = 8
PING_INTERVAL = 5
notice_displayed = False
BAD_MSG_DESCRIPTION = {
16: "[16] msg_id too low, the client time has to be synchronized",
17: "[17] msg_id too high, the client time has to be synchronized",
18: "[18] incorrect two lower order msg_id bits, the server expects client message msg_id to be divisible by 4",
19: "[19] container msg_id is the same as msg_id of a previously received message",
20: "[20] message too old, it cannot be verified by the server",
32: "[32] msg_seqno too low",
33: "[33] msg_seqno too high",
34: "[34] an even msg_seqno expected, but odd received",
35: "[35] odd msg_seqno expected, but even received",
48: "[48] incorrect server salt",
64: "[64] invalid container"
}
def __init__(
self,
client: "pyrogram.Client",
dc_id: int,
auth_key: bytes,
test_mode: bool,
is_media: bool = False,
is_cdn: bool = False
):
if not Session.notice_displayed:
print(f"Pyrogram v{__version__}, {__copyright__}")
print(f"Licensed under the terms of the {__license__}", end="\n\n")
Session.notice_displayed = True
self.client = client
self.dc_id = dc_id
self.auth_key = auth_key
self.test_mode = test_mode
self.is_media = is_media
self.is_cdn = is_cdn
self.connection = None
self.auth_key_id = sha1(auth_key).digest()[-8:]
self.session_id = os.urandom(8)
self.msg_factory = MsgFactory()
self.current_salt = None
self.pending_acks = set()
self.results = {}
self.ping_task = None
self.ping_task_event = asyncio.Event()
self.next_salt_task = None
self.next_salt_task_event = asyncio.Event()
self.network_task = None
self.is_connected = asyncio.Event()
self.loop = asyncio.get_event_loop()
async def start(self):
while True:
self.connection = Connection(
self.dc_id,
self.test_mode,
self.client.ipv6,
self.client.proxy
)
try:
await self.connection.connect()
self.network_task = self.loop.create_task(self.network_worker())
self.current_salt = FutureSalt(0, 0, Session.INITIAL_SALT)
self.current_salt = FutureSalt(
0, 0,
(await self._send(
raw.functions.Ping(ping_id=0),
timeout=self.START_TIMEOUT
)).new_server_salt
)
self.current_salt = (await self._send(
raw.functions.GetFutureSalts(num=1),
timeout=self.START_TIMEOUT)).salts[0]
self.next_salt_task = self.loop.create_task(self.next_salt_worker())
if not self.is_cdn:
await self._send(
raw.functions.InvokeWithLayer(
layer=layer,
query=raw.functions.InitConnection(
api_id=self.client.api_id,
app_version=self.client.app_version,
device_model=self.client.device_model,
system_version=self.client.system_version,
system_lang_code=self.client.lang_code,
lang_code=self.client.lang_code,
lang_pack="",
query=raw.functions.help.GetConfig(),
)
),
timeout=self.START_TIMEOUT
)
self.ping_task = self.loop.create_task(self.ping_worker())
log.info(f"Session initialized: Layer {layer}")
log.info(f"Device: {self.client.device_model} - {self.client.app_version}")
log.info(f"System: {self.client.system_version} ({self.client.lang_code.upper()})")
except AuthKeyDuplicated as e:
await self.stop()
raise e
except (OSError, TimeoutError, RPCError):
await self.stop()
except Exception as e:
await self.stop()
raise e
else:
break
self.is_connected.set()
log.info("Session started")
async def stop(self):
self.is_connected.clear()
self.ping_task_event.set()
self.next_salt_task_event.set()
if self.ping_task is not None:
await self.ping_task
if self.next_salt_task is not None:
await self.next_salt_task
self.ping_task_event.clear()
self.next_salt_task_event.clear()
self.connection.close()
if self.network_task:
await self.network_task
for i in self.results.values():
i.event.set()
if not self.is_media and callable(self.client.disconnect_handler):
try:
await self.client.disconnect_handler(self.client)
except Exception as e:
log.error(e, exc_info=True)
log.info("Session stopped")
async def restart(self):
await self.stop()
await self.start()
async def handle_packet(self, packet):
data = await self.loop.run_in_executor(
pyrogram.crypto_executor,
mtproto.unpack,
BytesIO(packet),
self.session_id,
self.auth_key,
self.auth_key_id
)
messages = (
data.body.messages
if isinstance(data.body, MsgContainer)
else [data]
)
# Call log.debug twice because calling it once by appending "data" to the previous string (i.e. f"Kind: {data}")
# will cause "data" to be evaluated as string every time instead of only when debug is actually enabled.
log.debug("Received:")
log.debug(data)
for msg in messages:
if msg.seq_no == 0:
MsgId.set_server_time(msg.msg_id / (2 ** 32))
if msg.seq_no % 2 != 0:
if msg.msg_id in self.pending_acks:
continue
else:
self.pending_acks.add(msg.msg_id)
if isinstance(msg.body, (raw.types.MsgDetailedInfo, raw.types.MsgNewDetailedInfo)):
self.pending_acks.add(msg.body.answer_msg_id)
continue
if isinstance(msg.body, raw.types.NewSessionCreated):
continue
msg_id = None
if isinstance(msg.body, (raw.types.BadMsgNotification, raw.types.BadServerSalt)):
msg_id = msg.body.bad_msg_id
elif isinstance(msg.body, (FutureSalts, raw.types.RpcResult)):
msg_id = msg.body.req_msg_id
elif isinstance(msg.body, raw.types.Pong):
msg_id = msg.body.msg_id
else:
if self.client is not None:
self.loop.create_task(self.client.handle_updates(msg.body))
if msg_id in self.results:
self.results[msg_id].value = getattr(msg.body, "result", msg.body)
self.results[msg_id].event.set()
if len(self.pending_acks) >= self.ACKS_THRESHOLD:
log.debug(f"Send {len(self.pending_acks)} acks")
try:
await self._send(raw.types.MsgsAck(msg_ids=list(self.pending_acks)), False)
except (OSError, TimeoutError):
pass
else:
self.pending_acks.clear()
async def ping_worker(self):
log.info("PingTask started")
while True:
try:
await asyncio.wait_for(self.ping_task_event.wait(), self.PING_INTERVAL)
except asyncio.TimeoutError:
pass
else:
break
try:
await self._send(
raw.functions.PingDelayDisconnect(
ping_id=0, disconnect_delay=self.WAIT_TIMEOUT + 10
), False
)
except (OSError, TimeoutError, RPCError):
pass
log.info("PingTask stopped")
async def next_salt_worker(self):
log.info("NextSaltTask started")
while True:
now = datetime.fromtimestamp(time.perf_counter() - MsgId.reference_clock + MsgId.server_time)
# Seconds to wait until middle-overlap, which is
# 15 minutes before/after the current/next salt end/start time
valid_until = datetime.fromtimestamp(self.current_salt.valid_until)
dt = (valid_until - now).total_seconds() - 900
minutes, seconds = divmod(int(dt), 60)
log.info(f"Next salt in {minutes:.0f}m {seconds:.0f}s (at {now + timedelta(seconds=dt)})")
try:
await asyncio.wait_for(self.next_salt_task_event.wait(), dt)
except asyncio.TimeoutError:
pass
else:
break
try:
self.current_salt = (await self._send(raw.functions.GetFutureSalts(num=1))).salts[0]
except (OSError, TimeoutError, RPCError):
self.connection.close()
break
log.info("NextSaltTask stopped")
async def network_worker(self):
log.info("NetworkTask started")
while True:
packet = await self.connection.recv()
if packet is None or len(packet) == 4:
if packet:
log.warning(f'Server sent "{Int.read(BytesIO(packet))}"')
if self.is_connected.is_set():
self.loop.create_task(self.restart())
break
self.loop.create_task(self.handle_packet(packet))
log.info("NetworkTask stopped")
async def _send(self, data: TLObject, wait_response: bool = True, timeout: float = WAIT_TIMEOUT):
message = self.msg_factory(data)
msg_id = message.msg_id
if wait_response:
self.results[msg_id] = Result()
# Call log.debug twice because calling it once by appending "data" to the previous string (i.e. f"Kind: {data}")
# will cause "data" to be evaluated as string every time instead of only when debug is actually enabled.
log.debug(f"Sent:")
log.debug(message)
payload = await self.loop.run_in_executor(
pyrogram.crypto_executor,
mtproto.pack,
message,
self.current_salt.salt,
self.session_id,
self.auth_key,
self.auth_key_id
)
try:
await self.connection.send(payload)
except OSError as e:
self.results.pop(msg_id, None)
raise e
if wait_response:
try:
await asyncio.wait_for(self.results[msg_id].event.wait(), timeout)
except asyncio.TimeoutError:
pass
finally:
result = self.results.pop(msg_id).value
if result is None:
raise TimeoutError
elif isinstance(result, raw.types.RpcError):
if isinstance(data, (raw.functions.InvokeWithoutUpdates, raw.functions.InvokeWithTakeout)):
data = data.query
RPCError.raise_it(result, type(data))
elif isinstance(result, raw.types.BadMsgNotification):
raise Exception(self.BAD_MSG_DESCRIPTION.get(
result.error_code,
f"Error code {result.error_code}"
))
else:
return result
async def send(
self,
data: TLObject,
retries: int = MAX_RETRIES,
timeout: float = WAIT_TIMEOUT,
sleep_threshold: float = SLEEP_THRESHOLD
):
try:
await asyncio.wait_for(self.is_connected.wait(), self.WAIT_TIMEOUT)
except asyncio.TimeoutError:
pass
if isinstance(data, (raw.functions.InvokeWithoutUpdates, raw.functions.InvokeWithTakeout)):
query = data.query
else:
query = data
query = ".".join(query.QUALNAME.split(".")[1:])
while True:
try:
return await self._send(data, timeout=timeout)
except FloodWait as e:
amount = e.x
if amount > sleep_threshold >= 0:
raise
log.warning(f'[{self.client.session_name}] Sleeping for {amount}s (required by "{query}")')
await asyncio.sleep(amount)
except (OSError, TimeoutError, InternalServerError) as e:
if retries == 0:
raise e from None
(log.warning if retries < 2 else log.info)(
f'[{Session.MAX_RETRIES - retries + 1}] Retrying "{query}" due to {repr(e)}')
await asyncio.sleep(0.5)
return await self.send(data, retries - 1, timeout)
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