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tgcli.py
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tgcli.py
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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
import os
import time
import json
import socket
import shutil
import signal
import logging
import tempfile
import threading
import subprocess
'''
tgcli.py - Library to interact with telegram-cli.
Copyright (C) 2015-2016 Dingyuan Wang
This program 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.
This program 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 this program. If not, see
<http://www.gnu.org/licenses/>.
'''
tg_server_pub = '''-----BEGIN RSA PUBLIC KEY-----
MIIBCgKCAQEAwVACPi9w23mF3tBkdZz+zwrzKOaaQdr01vAbU4E1pvkfj4sqDsm6
lyDONS789sVoD/xCS9Y0hkkC3gtL1tSfTlgCMOOul9lcixlEKzwKENj1Yz/s7daS
an9tqw3bfUV/nqgbhGX81v/+7RFAEd+RwFnK7a+XYl9sluzHRyVVaTTveB2GazTw
Efzk2DWgkBluml8OREmvfraX3bkHZJTKX4EQSjBbbdJ2ZXIsRrYOXfaA+xayEGB+
8hdlLmAjbCVfaigxX0CDqWeR1yFL9kwd9P0NsZRPsmoqVwMbMu7mStFai6aIhc3n
Slv8kg9qv1m6XHVQY3PnEw+QQtqSIXklHwIDAQAB
-----END RSA PUBLIC KEY-----
'''
logger = logging.getLogger('tgcli')
logger.setLevel(logging.INFO)
do_nothing = lambda *args, **kwargs: None
def preexec_ignore_sigint():
'''
Ignore the SIGINT signal by setting the handler to the standard
signal handler SIG_IGN.
'''
signal.signal(signal.SIGINT, signal.SIG_IGN)
class TelegramCliExited(RuntimeError):
pass
class TelegramCliInterface:
def __init__(self, cmd, extra_args=(), run=True, timeout=60, ignore_sigint=True):
self.cmd = cmd
self.extra_args = tuple(extra_args)
self.proc = None
self.sock = None
self.buffer = b''
self.ready = threading.Event()
self.closed = False
self.thread = None
self.tmpdir = tempfile.mkdtemp()
self.timeout = timeout
self.ignore_sigint = ignore_sigint
# Event callbacks
# `on_info`, `on_json` and `on_text` are for stdout
self.on_info = logger.info
self.on_json = logger.debug
self.on_text = do_nothing
self.on_start = lambda: logger.info('Telegram-cli started.')
self.on_exit = lambda: logger.warning('Telegram-cli died.')
if run:
self.run()
def _get_pubkey(self):
tgdir = os.path.abspath(os.path.join(os.path.dirname(
os.path.realpath(self.cmd)), '..'))
paths = [
os.path.join(tgdir, 'tg-server.pub'),
os.path.join(tgdir, 'server.pub'),
'/etc/telegram-cli/server.pub',
'/usr/local/etc/telegram-cli/server.pub',
os.path.join(self.tmpdir, 'tg-server.pub')
]
for path in paths:
if os.path.isfile(path):
return path
else:
with open(path, 'w') as f:
f.write(tg_server_pub)
return path
def checkproc(self):
if self.closed or self.proc and self.proc.poll() is None:
return self.proc
sockfile = os.path.join(self.tmpdir, 'tgcli.sock')
if os.path.exists(sockfile):
os.unlink(sockfile)
self.proc = subprocess.Popen((self.cmd, '-k', self._get_pubkey(),
'--json', '-R', '-C', '-S', sockfile) + self.extra_args,
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
preexec_fn=preexec_ignore_sigint if self.ignore_sigint else None)
while not os.path.exists(sockfile):
time.sleep(0.5)
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sock.connect(sockfile)
return self.proc
def _run_cli(self):
while not self.closed:
self.checkproc()
try:
while not self.closed:
out = self.proc.stdout.readline().decode('utf-8')
if not out:
break
elif not self.ready.is_set():
self.on_start()
self.ready.set()
self.on_text(out)
if out[0] in '[{':
try:
self.on_json(json.loads(out.strip()))
except ValueError:
self.on_info(out.strip())
else:
self.on_info(out.strip())
except BrokenPipeError:
pass
finally:
try:
self.sock.shutdown(socket.SHUT_RDWR)
except Exception:
pass
if self.proc and self.proc.poll() is None:
self.proc.terminate()
self.proc.wait()
self.ready.clear()
self.on_exit()
def run(self):
self.thread = threading.Thread(target=self._run_cli)
self.thread.daemon = True
self.thread.start()
self.ready.wait()
def restart(self):
self.close()
self.closed = False
self.tmpdir = tempfile.mkdtemp()
self.run()
def close(self):
if self.closed:
return
self.closed = True
self.ready.clear()
try:
self.proc.wait(2)
except subprocess.TimeoutExpired:
self.proc.kill()
if self.thread:
self.thread.join(1)
if os.path.isdir(self.tmpdir):
shutil.rmtree(self.tmpdir, True)
self.tmpdir = None
def __enter__(self):
if not self.thread:
self.run()
self.ready.wait()
return self
def __exit__(self, exc_type, exc_value, traceback):
self.close()
def __del__(self):
self.close()
def _readline(self):
while self.ready.is_set():
lines = self.buffer.split(b'\n', 1)
if len(lines) > 1:
self.buffer = lines[1]
return lines[0] + b'\n'
else:
self.buffer += self.sock.recv(1024)
# usually there is an assertion error
raise TelegramCliExited('telegram-cli unexpectedly exited.')
def send_command(self, cmd, timeout=None, resync=True):
'''
Send a command to tg-cli.
use `resync` for consuming text since last timeout.
'''
logger.debug(cmd)
self.ready.wait()
self.sock.settimeout(timeout or self.timeout)
self.sock.sendall(cmd.encode('utf-8') + b'\n')
line = self._readline()
while resync and not line.startswith(b'ANSWER '):
line = self._readline()
size = int(line[7:].decode('ascii'))
reply = b''
while len(reply) < size:
reply += self._readline()
ret = reply.decode('utf-8')
try:
return json.loads(ret)
except ValueError:
return ret
def __getattr__(self, name):
'''
Convenience command calling: cmd_*(*args, **kwargs)
`args` are for the tg-cli command
`kwargs` are for `send_command`
'''
if name.startswith('cmd_'):
fn = lambda *args, **kwargs: self.send_command(
' '.join(map(str, (name[4:],) + args)), **kwargs)
return fn
else:
raise AttributeError('TelegramCliInterface has no attribute %r' % name)
if __name__ == "__main__":
import sys
logging.basicConfig(stream=sys.stderr, format='%(asctime)s [%(levelname)s] %(message)s', level=logging.INFO)
with TelegramCliInterface(sys.argv[1]) as tgcli:
for ln in sys.stdin:
try:
cmd = ln.strip()
print(tgcli.send_command(cmd))
except Exception:
logging.exception('Failed to execute: ' + cmd)