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import asyncio
import asyncio.subprocess
import socket
import dataclasses
from typing import Tuple
from typing import List
from typing import Optional
import netifaces
from ... import tools
from ... import aiotools
from ... import aioproc
from ...logging import get_logger
from .stun import stun_get_info
# =====
@dataclasses.dataclass(frozen=True)
class _Netcfg:
nat_type: str = dataclasses.field(default="")
src_ip: str = dataclasses.field(default="")
ext_ip: str = dataclasses.field(default="")
stun_host: str = dataclasses.field(default="")
stun_port: int = dataclasses.field(default=0)
# =====
class JanusRunner:
def __init__( # pylint: disable=too-many-instance-attributes
self,
stun_host: str,
stun_port: int,
stun_timeout: float,
check_interval: int,
check_retries: int,
check_retries_delay: float,
cmd: List[str],
cmd_remove: List[str],
cmd_append: List[str],
) -> None:
self.__stun_host = stun_host
self.__stun_port = stun_port
self.__stun_timeout = stun_timeout
self.__check_interval = check_interval
self.__check_retries = check_retries
self.__check_retries_delay = check_retries_delay
self.__cmd = tools.build_cmd(cmd, cmd_remove, cmd_append)
self.__janus_task: Optional[asyncio.Task] = None
self.__janus_proc: Optional[asyncio.subprocess.Process] = None # pylint: disable=no-member
def run(self) -> None:
logger = get_logger(0)
logger.info("Starting Janus Runner ...")
try:
asyncio.run(self.__run())
except (SystemExit, KeyboardInterrupt):
pass
logger.info("Bye-bye")
# =====
async def __run(self) -> None:
logger = get_logger(0)
try:
prev_netcfg: Optional[_Netcfg] = None
while True:
netcfg = _Netcfg()
for _ in range(self.__check_retries - 1):
netcfg = await self.__get_netcfg()
if netcfg.ext_ip:
break
await asyncio.sleep(self.__check_retries_delay)
if netcfg != prev_netcfg:
logger.info("Got new %s", netcfg)
if netcfg.src_ip and netcfg.ext_ip:
logger.info("Okay, restarting Janus ...")
await self.__stop_janus()
await self.__start_janus(netcfg)
else:
logger.error("Empty src_ip or ext_ip; stopping Janus ...")
await self.__stop_janus()
prev_netcfg = netcfg
await asyncio.sleep(self.__check_interval)
except: # noqa: E722
await self.__stop_janus()
raise
async def __get_netcfg(self) -> _Netcfg:
src_ip = (self.__get_default_ip() or "0.0.0.0")
(nat_type, ext_ip) = await self.__get_stun_info(src_ip)
return _Netcfg(nat_type, src_ip, ext_ip, self.__stun_host, self.__stun_port)
def __get_default_ip(self) -> str:
try:
gws = netifaces.gateways()
if "default" not in gws:
raise RuntimeError(f"No default gateway: {gws}")
iface = ""
for proto in [socket.AF_INET, socket.AF_INET6]:
if proto in gws["default"]:
iface = gws["default"][proto][1]
break
else:
raise RuntimeError(f"No iface for the gateway {gws['default']}")
for addr in netifaces.ifaddresses(iface).get(proto, []):
return addr["addr"]
except Exception as err:
get_logger().error("Can't get default IP: %s", tools.efmt(err))
return ""
async def __get_stun_info(self, src_ip: str) -> Tuple[str, str]:
try:
return (await stun_get_info(
stun_host=self.__stun_host,
stun_port=self.__stun_port,
src_ip=src_ip,
src_port=0,
timeout=self.__stun_timeout,
))
except Exception as err:
get_logger().error("Can't get STUN info: %s", tools.efmt(err))
return ("", "")
# =====
@aiotools.atomic
async def __start_janus(self, netcfg: _Netcfg) -> None:
assert not self.__janus_task
self.__janus_task = asyncio.create_task(self.__janus_task_loop(netcfg))
@aiotools.atomic
async def __stop_janus(self) -> None:
if self.__janus_task:
self.__janus_task.cancel()
await asyncio.gather(self.__janus_task, return_exceptions=True)
await self.__kill_janus_proc()
self.__janus_task = None
# =====
async def __janus_task_loop(self, netcfg: _Netcfg) -> None: # pylint: disable=too-many-branches
logger = get_logger(0)
while True: # pylint: disable=too-many-nested-blocks
try:
await self.__start_janus_proc(netcfg)
assert self.__janus_proc is not None
await aioproc.log_stdout_infinite(self.__janus_proc, logger)
raise RuntimeError("Janus unexpectedly died")
except asyncio.CancelledError:
break
except Exception:
if self.__janus_proc:
logger.exception("Unexpected Janus error: pid=%d", self.__janus_proc.pid)
else:
logger.exception("Can't start Janus")
await self.__kill_janus_proc()
await asyncio.sleep(1)
async def __start_janus_proc(self, netcfg: _Netcfg) -> None:
assert self.__janus_proc is None
placeholders = {
key: str(value)
for (key, value) in dataclasses.asdict(netcfg).items()
}
cmd = [
part.format(**placeholders)
for part in self.__cmd
]
self.__janus_proc = await aioproc.run_process(cmd)
get_logger(0).info("Started Janus pid=%d: %s", self.__janus_proc.pid, cmd)
async def __kill_janus_proc(self) -> None:
if self.__janus_proc:
await aioproc.kill_process(self.__janus_proc, 5, get_logger(0))
self.__janus_proc = None
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