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import asyncio
import asyncio.subprocess
from typing import List
from typing import Dict
from typing import Optional
from .logging import get_logger
from . import gpio
# =====
class Streamer: # pylint: disable=too-many-instance-attributes
def __init__(
self,
cap_power: int,
conv_power: int,
sync_delay: float,
init_delay: float,
init_restart_after: float,
quality: int,
cmd: List[str],
loop: asyncio.AbstractEventLoop,
) -> None:
self.__cap_power = (gpio.set_output(cap_power) if cap_power > 0 else cap_power)
self.__conv_power = (gpio.set_output(conv_power) if conv_power > 0 else conv_power)
self.__sync_delay = sync_delay
self.__init_delay = init_delay
self.__init_restart_after = init_restart_after
self.__quality = quality
self.__cmd = cmd
self.__loop = loop
self.__proc_task: Optional[asyncio.Task] = None
async def start(self, quality: int, no_init_restart: bool=False) -> None:
logger = get_logger()
logger.info("Starting streamer ...")
assert 1 <= quality <= 100
self.__quality = quality
await self.__inner_start()
if self.__init_restart_after > 0.0 and not no_init_restart:
logger.info("Stopping streamer to restart ...")
await self.__inner_stop()
logger.info("Starting again ...")
await self.__inner_start()
async def stop(self) -> None:
get_logger().info("Stopping streamer ...")
await self.__inner_stop()
def is_running(self) -> bool:
return bool(self.__proc_task)
def get_current_quality(self) -> int:
return self.__quality
def get_state(self) -> Dict:
return {
"is_running": self.is_running(),
"quality": self.__quality,
}
async def cleanup(self) -> None:
if self.is_running():
await self.stop()
async def __inner_start(self) -> None:
assert not self.__proc_task
await self.__set_hw_enabled(True)
self.__proc_task = self.__loop.create_task(self.__process())
async def __inner_stop(self) -> None:
assert self.__proc_task
self.__proc_task.cancel()
await asyncio.gather(self.__proc_task, return_exceptions=True)
await self.__set_hw_enabled(False)
self.__proc_task = None
async def __set_hw_enabled(self, enabled: bool) -> None:
# XXX: This sequence is very important to enable converter and cap board
if self.__cap_power > 0:
gpio.write(self.__cap_power, enabled)
if self.__conv_power > 0:
if enabled:
await asyncio.sleep(self.__sync_delay)
gpio.write(self.__conv_power, enabled)
if enabled:
await asyncio.sleep(self.__init_delay)
async def __process(self) -> None: # pylint: disable=too-many-branches
logger = get_logger(0)
while True: # pylint: disable=too-many-nested-blocks
proc: Optional[asyncio.subprocess.Process] = None # pylint: disable=no-member
try:
cmd = [part.format(quality=self.__quality) for part in self.__cmd]
proc = await asyncio.create_subprocess_exec(
*cmd,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.STDOUT,
)
logger.info("Started streamer pid=%d: %s", proc.pid, cmd)
empty = 0
while proc.returncode is None:
line = (await proc.stdout.readline()).decode(errors="ignore").strip()
if line:
logger.info("streamer: %s", line)
empty = 0
else:
empty += 1
if empty == 100: # asyncio bug
break
raise RuntimeError("WTF")
except asyncio.CancelledError:
break
except Exception as err:
if proc:
logger.exception("Unexpected streamer error: pid=%d", proc.pid)
else:
logger.exception("Can't start streamer: %s", err)
await asyncio.sleep(1)
finally:
if proc and proc.returncode is None:
await self.__kill(proc)
async def __kill(self, proc: asyncio.subprocess.Process) -> None: # pylint: disable=no-member
try:
proc.terminate()
await asyncio.sleep(1)
if proc.returncode is None:
try:
proc.kill()
except Exception:
if proc.returncode is not None:
raise
await proc.wait()
get_logger().info("Streamer killed: pid=%d; retcode=%d", proc.pid, proc.returncode)
except Exception:
if proc.returncode is None:
get_logger().exception("Can't kill streamer pid=%d", proc.pid)
else:
get_logger().info("Streamer killed: pid=%d; retcode=%d", proc.pid, proc.returncode)
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