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from json import JSONDecodeError
from parse import Result, parse
from websockets import connect
from random import randint
from enum import IntEnum
from typing import Union
import asyncssh
import argparse
import asyncio
import logging
import json
import sys
import os
import re
from contextlib import asynccontextmanager
logging.getLogger('AGLBaseService')
logging.basicConfig(level=logging.DEBUG)
class AFBT(IntEnum):
REQUEST = 2,
RESPONSE = 3,
ERROR = 4,
EVENT = 5
msgq = {}
AFBLEN = 3
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: str
url: str
ip : str
port = None
token: str
uuid: str
service = None
logger = None
@staticmethod
def getparser():
parser = argparse.ArgumentParser(description='Utility to interact with agl-service-gps via it\'s websocket')
parser.add_argument('-l', '--loglevel', help='Level of logging verbosity', default='INFO',
choices=list(logging._nameToLevel.keys()))
parser.add_argument('ipaddr', default=os.environ.get('AGL_TGT_IP', 'localhost'), help='AGL host address')
parser.add_argument('--port', default=os.environ.get('AGL_TGT_PORT', None), help=f'AGL service websocket port')
parser.add_argument('--listener', default=False, help='Register a listener for incoming events', action='store_true')
parser.add_argument('--subscribe', type=str, help='Subscribe to event type', metavar='event')
parser.add_argument('--unsubscribe', type=str, help='Unsubscribe from event type', metavar='event')
parser.add_argument('--json', type=str, help='Send your own json string')
parser.add_argument('--verb', type=str, help='Send the json above to specific verb')
parser.add_argument('--api', type=str, help='Send the above two to a specific api')
return parser
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.error('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, timeout=2)
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):
# TODO:handle ssh timeouts, asyncssh does not support it apparently, and connect returns context_manager which
# cannot be used with asyncio.wait_for
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:
self.logger.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))
self.logger.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
self.logger.debug(f'Service running at port {port}')
return port
async def listener(self, stdout: bool = False):
while True:
data = await self.response()
if stdout: print(data)
yield data
async def response(self):
try:
msg = await self.websocket.recv()
try:
data = json.loads(msg)
self.logger.debug('[AGL] -> ' + msg)
if isinstance(data, list):
if len(data) == AFBLEN and data[0] == AFBT.RESPONSE and str.isnumeric(data[1]):
msgid = int(data[1])
if msgid in msgq:
addresponse(msgid, data)
return data
except JSONDecodeError:
self.logger.warning("Not decoding a non-json message")
except KeyboardInterrupt:
self.logger.debug("Received keyboard interrupt, exiting")
except asyncio.CancelledError:
self.logger.warning("Websocket listener coroutine stopped")
except Exception as e:
self.logger.error("Unhandled seal: " + str(e))
async def request(self, verb: str, values: Union[str, dict] = "", msgid: int = randint(0, 9999999)):
l = json.dumps([AFBT.REQUEST, str(msgid), f'{self.api}/{verb}', values])
self.logger.debug(f'[AGL] <- {l}')
await self.send(l)
return msgid
async def subscribe(self, event):
return await self.request('subscribe', {'value': f'{event}'})
async def unsubscribe(self, event):
return await self.request('unsubscribe', {'value': f'{event}'})
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