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from enum import IntEnum
import json
from json import JSONDecodeError
from random import randint
import sys
import asyncio
from random import randint
from websockets import connect
import logging
import asyncssh
import re
from parse import Result, parse
from typing import Union
logging.getLogger('AGLBaseService')
logging.basicConfig(level=logging.DEBUG)
class AFBT(IntEnum):
REQUEST = 2,
RESPONSE = 3,
ERROR = 4,
EVENT = 5
msgq = {}
# TODO : Replace prints with logging
def addrequest(msgid, msg):
msgq[msgid] = {'request': msg, 'response': None}
def addresponse(msgid, msg):
if msgid in msgq.keys():
msgq[msgid]['response'] = msg
class AGLBaseService:
api = None
url = None
ip = None
port = None
token = None
uuid = None
service = None
logger = None
def __init__(self, api: str, ip: str, port: str = None, url: str = None,
token: str = 'HELLO', uuid: str = 'magic', service: str = None):
self.api = api
self.url = url
self.ip = ip
self.port = port
self.token = token
self.uuid = uuid
self.service = service
self.logger = logging.getLogger(service)
def __await__(self):
return self._async_init().__await__()
async def __aenter__(self):
return self._async_init()
async def _async_init(self):
# setting ping_interval to None because AFB does not support websocket ping
# if set to !None, the library will close the socket after the default timeout
if self.port is None:
serviceport = await self.portfinder()
if serviceport is not None:
self.port = serviceport
else:
self.logger('Unable to find port')
exit(1)
URL = f'ws://{self.ip}:{self.port}/api?token={self.token}&uuid={self.uuid}'
self._conn = connect(close_timeout=0, uri=URL, subprotocols=['x-afb-ws-json1'], ping_interval=None)
self.websocket = await self._conn.__aenter__()
return self
async def __aexit__(self, *args, **kwargs):
await self._conn.__aexit__(*args, **kwargs)
async def close(self):
await self._conn.__aexit__(*sys.exc_info())
async def send(self, message):
await self.websocket.send(message)
async def receive(self):
return await self.websocket.recv()
async def portfinder(self):
async with asyncssh.connect(self.ip, username='root') as c:
servicename = await c.run(f"systemctl --all | grep {self.service}-- | awk '{{print $1}}'", check=False)
if self.service not in servicename.stdout:
logging.error(f"Service matching pattern - '{self.service}' - NOT FOUND")
exit(1)
pidres = await c.run(f'systemctl show --property MainPID --value {servicename.stdout.strip()}')
pid = int(pidres.stdout.strip(), 10)
if pid is 0:
logging.warning(f'Service {servicename.stdout.strip()} is stopped')
return None
else:
logging.debug(f'Service PID: {str(pid)}')
sockets = await c.run(f'find /proc/{pid}/fd/ | xargs readlink | grep socket')
inodes = frozenset(re.findall('socket:\[(.*)\]', sockets.stdout))
logging.debug(f"Socket inodes: {inodes}")
procnettcp = await c.run('cat /proc/net/tcp')
fieldsstr = '{sl}: {local_address} {rem_address} {st} {tx_queue}:{rx_queue} {tr}:{tmwhen} {retrnsmt} {uid}'\
' {timeout} {inode} {sref_cnt} {memloc} {rto} {pred_sclk} {ackquick} {congest} {slowstart}'
tcpsockets = [' '.join(l.split()) for l in procnettcp.stdout.splitlines()[1:]]
# different lines with less stats appear sometimes, parse will return None, so ignore 'None' lines
parsedtcpsockets = []
for l in tcpsockets:
res = parse(fieldsstr, l)
if isinstance(res, Result):
parsedtcpsockets.append(res)
socketinodesbythisprocess = [l for l in parsedtcpsockets if
isinstance(l, Result) and
l.named['inode'] in inodes and
# 0A is listening state for the socket
l.named['st'] == '0A']
for s in socketinodesbythisprocess:
_, port = tuple(parse('{}:{}', s['local_address']))
port = int(port, 16)
if port >= 30000: # the port is above 30000 range, 8080 is some kind of proxy
logging.debug(f'Service running at port {port}')
return port
async def listener(self):
try:
while True:
msg = await self.receive()
# self.logger.debug(f"Received websocket{msg}")
try:
data = json.loads(msg)
if isinstance(data, list):
if data[0] == AFBT.RESPONSE and str.isnumeric(data[1]):
msgid = int(data[1])
if msgid in msgq:
addresponse(msgid, data)
except JSONDecodeError:
self.logger.warning("Not decoding a non-json message")
except KeyboardInterrupt:
logging.debug("Received keyboard interrupt, exiting")
except asyncio.CancelledError:
logging.warning("Websocket listener coroutine stopped")
except Exception as e:
logging.error("Unhandled seal: " + str(e))
async def request(self, verb: str, values: Union[str, dict] = "", msgid: int = randint(0, 9999999),
waitresponse: bool = False):
l = json.dumps([AFBT.REQUEST, str(msgid), f'{self.api}/{verb}', values])
self.logger.debug(f'[AGL] <- {l}')
await self.send(l)
if waitresponse:
return await self.receive()
async def subscribe(self, event):
await self.request('subscribe', {'value': f'{event}'})
async def unsubscribe(self, event):
await self.request('unsubscribe', {'value': f'{event}'})
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