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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 time

from threading import Thread, Event, Lock

log = logging.getLogger(__name__)

class Syncer:

INTERVAL = 20

clients = {}

thread = None

event = Event()

lock = Lock()

@classmethod

def add(cls, client):

with cls.lock:

cls.sync(client)

cls.clients[id(client)] = client

if len(cls.clients) == 1:

cls.start()

@classmethod

def remove(cls, client):

with cls.lock:

cls.sync(client)

del cls.clients[id(client)]

if len(cls.clients) == 0:

cls.stop()

@classmethod

def start(cls):

cls.event.clear()

cls.thread = Thread(target=cls.worker, name=cls.__name__)

cls.thread.start()

@classmethod

def stop(cls):

cls.event.set()

@classmethod

def worker(cls):

while True:

cls.event.wait(cls.INTERVAL)

if cls.event.is_set():

break

with cls.lock:

for client in cls.clients.values():

cls.sync(client)

@classmethod

def sync(cls, client):

try:

start = time.time()

client.storage.save()

except Exception as e:

log.critical(e, exc_info=True)

else:

log.info('Synced "{}" in {:.6} ms'.format(

client.storage.name,

(time.time() - start) * 1000

))