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session.py
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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 bisect
import logging
import os
from hashlib import sha1
from io import BytesIO
import pyrogram
from pyrogram import raw
from pyrogram.connection import Connection
from pyrogram.crypto import mtproto
from pyrogram.errors import (
RPCError, InternalServerError, AuthKeyDuplicated, FloodWait, ServiceUnavailable, BadMsgNotification,
SecurityCheckMismatch
)
from pyrogram.raw.all import layer
from pyrogram.raw.core import TLObject, MsgContainer, Int, FutureSalts
from .internals import MsgId, MsgFactory
log = logging.getLogger(__name__)
class Result:
def __init__(self):
self.value = None
self.event = asyncio.Event()
class Session:
START_TIMEOUT = 2
WAIT_TIMEOUT = 15
SLEEP_THRESHOLD = 10
MAX_RETRIES = 10
ACKS_THRESHOLD = 10
PING_INTERVAL = 5
STORED_MSG_IDS_MAX_SIZE = 1000 * 2
TRANSPORT_ERRORS = {
404: "auth key not found",
429: "transport flood",
444: "invalid DC"
}
def __init__(
self,
client: "pyrogram.Client",
dc_id: int,
auth_key: bytes,
test_mode: bool,
is_media: bool = False,
is_cdn: bool = False
):
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.salt = 0
self.pending_acks = set()
self.results = {}
self.stored_msg_ids = []
self.ping_task = None
self.ping_task_event = asyncio.Event()
self.recv_task = None
self.is_started = 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,
self.is_media
)
try:
await self.connection.connect()
self.recv_task = self.loop.create_task(self.recv_worker())
await self.send(raw.functions.Ping(ping_id=0), timeout=self.START_TIMEOUT)
if not self.is_cdn:
await self.send(
raw.functions.InvokeWithLayer(
layer=layer,
query=raw.functions.InitConnection(
api_id=await self.client.storage.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("Session initialized: Layer %s", layer)
log.info("Device: %s - %s", self.client.device_model, self.client.app_version)
log.info("System: %s (%s)", self.client.system_version, self.client.lang_code)
except AuthKeyDuplicated as e:
await self.stop()
raise e
except (OSError, RPCError):
await self.stop()
except Exception as e:
await self.stop()
raise e
else:
break
self.is_started.set()
log.info("Session started")
async def stop(self):
self.is_started.clear()
self.stored_msg_ids.clear()
self.ping_task_event.set()
if self.ping_task is not None:
await self.ping_task
self.ping_task_event.clear()
await self.connection.close()
if self.recv_task:
await self.recv_task
if not self.is_media and callable(self.client.disconnect_handler):
try:
await self.client.disconnect_handler(self.client)
except Exception as e:
log.exception(e)
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]
)
log.debug("Received: %s", data)
for msg in messages:
if msg.seq_no % 2 != 0:
if msg.msg_id in self.pending_acks:
continue
else:
self.pending_acks.add(msg.msg_id)
try:
if len(self.stored_msg_ids) > Session.STORED_MSG_IDS_MAX_SIZE:
del self.stored_msg_ids[:Session.STORED_MSG_IDS_MAX_SIZE // 2]
if self.stored_msg_ids:
if msg.msg_id < self.stored_msg_ids[0]:
raise SecurityCheckMismatch("The msg_id is lower than all the stored values")
if msg.msg_id in self.stored_msg_ids:
raise SecurityCheckMismatch("The msg_id is equal to any of the stored values")
time_diff = (msg.msg_id - MsgId()) / 2 ** 32
if time_diff > 30:
raise SecurityCheckMismatch("The msg_id belongs to over 30 seconds in the future. "
"Most likely the client time has to be synchronized.")
if time_diff < -300:
raise SecurityCheckMismatch("The msg_id belongs to over 300 seconds in the past. "
"Most likely the client time has to be synchronized.")
except SecurityCheckMismatch as e:
log.info("Discarding packet: %s", e)
await self.connection.close()
return
else:
bisect.insort(self.stored_msg_ids, 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("Sending %s acks", len(self.pending_acks))
try:
await self.send(raw.types.MsgsAck(msg_ids=list(self.pending_acks)), False)
except OSError:
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, RPCError):
pass
log.info("PingTask stopped")
async def recv_worker(self):
log.info("NetworkTask started")
while True:
packet = await self.connection.recv()
if packet is None or len(packet) == 4:
if packet:
error_code = -Int.read(BytesIO(packet))
log.warning(
"Server sent transport error: %s (%s)",
error_code, Session.TRANSPORT_ERRORS.get(error_code, "unknown error")
)
if self.is_started.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()
log.debug("Sent: %s", message)
payload = await self.loop.run_in_executor(
pyrogram.crypto_executor,
mtproto.pack,
message,
self.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
result = self.results.pop(msg_id).value
if result is None:
raise TimeoutError("Request timed out")
if isinstance(result, raw.types.RpcError):
if isinstance(data, (raw.functions.InvokeWithoutUpdates, raw.functions.InvokeWithTakeout)):
data = data.query
RPCError.raise_it(result, type(data))
if isinstance(result, raw.types.BadMsgNotification):
log.warning("%s: %s", BadMsgNotification.__name__, BadMsgNotification(result.error_code))
if isinstance(result, raw.types.BadServerSalt):
self.salt = result.new_server_salt
return await self.send(data, wait_response, timeout)
return result
async def invoke(
self,
query: TLObject,
retries: int = MAX_RETRIES,
timeout: float = WAIT_TIMEOUT,
sleep_threshold: float = SLEEP_THRESHOLD
):
try:
await asyncio.wait_for(self.is_started.wait(), self.WAIT_TIMEOUT)
except asyncio.TimeoutError:
pass
if isinstance(query, (raw.functions.InvokeWithoutUpdates, raw.functions.InvokeWithTakeout)):
inner_query = query.query
else:
inner_query = query
query_name = ".".join(inner_query.QUALNAME.split(".")[1:])
while True:
try:
return await self.send(query, timeout=timeout)
except FloodWait as e:
amount = e.value
if amount > sleep_threshold >= 0:
raise
log.warning('[%s] Waiting for %s seconds before continuing (required by "%s")',
self.client.name, amount, query_name)
await asyncio.sleep(amount)
except (OSError, InternalServerError, ServiceUnavailable) as e:
if retries == 0:
raise e from None
(log.warning if retries < 2 else log.info)(
'[%s] Retrying "%s" due to: %s',
Session.MAX_RETRIES - retries + 1,
query_name, str(e) or repr(e)
)
await asyncio.sleep(0.5)
return await self.invoke(query, retries - 1, timeout)