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Use a receive mem channel inside portals 

For now stop `.aclose()`-ing all async gens on portal close since it can
cause hangs and other weird behaviour if another task operates on the
same instance.

See https://bugs.python.org/issue32526.
trio_memchans
Tyler Goodlet 2019-02-15 16:27:18 -05:00
parent f44ac4528a
commit 61680b3729
1 changed files with 71 additions and 58 deletions
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71
tractor/_portal.py
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@ -76,8 +76,11 @@ class Portal:
await self.channel.aclose()
async def _submit(
self, ns: str, func: str, **kwargs
) -> Tuple[str, trio.Queue, str, Dict[str, Any]]:
self,
ns: str,
func: str,
kwargs,
) -> Tuple[str, trio.abc.ReceiveChannel, str, Dict[str, Any]]:
"""Submit a function to be scheduled and run by actor, return the
associated caller id, response queue, response type str,
first message packet as a tuple.
@ -85,11 +88,13 @@ class Portal:
This is an async call.
"""
# ship a function call request to the remote actor
cid, q = await current_actor().send_cmd(self.channel, ns, func, kwargs)
cid, recv_chan = await current_actor().send_cmd(
self.channel, ns, func, kwargs)
# wait on first response msg and handle (this should be
# in an immediate response)
first_msg = await q.get()
first_msg = await recv_chan.receive()
functype = first_msg.get('functype')
if functype == 'function' or functype == 'asyncfunction':
@ -101,12 +106,12 @@ class Portal:
else:
raise ValueError(f"{first_msg} is an invalid response packet?")
return cid, q, resp_type, first_msg
return cid, recv_chan, resp_type, first_msg
async def _submit_for_result(self, ns: str, func: str, **kwargs) -> None:
assert self._expect_result is None, \
"A pending main result has already been submitted"
self._expect_result = await self._submit(ns, func, **kwargs)
self._expect_result = await self._submit(ns, func, kwargs)
async def run(self, ns: str, func: str, **kwargs) -> Any:
"""Submit a remote function to be scheduled and run by actor,
@ -116,21 +121,25 @@ class Portal:
remote rpc task or a local async generator instance.
"""
return await self._return_from_resptype(
*(await self._submit(ns, func, **kwargs))
*(await self._submit(ns, func, kwargs))
)
async def _return_from_resptype(
self, cid: str, q: trio.Queue, resptype: str, first_msg: dict
self,
cid: str,
recv_chan: trio.abc.ReceiveChannel,
resptype: str,
first_msg: dict
) -> Any:
# TODO: not this needs some serious work and thinking about how
# to make async-generators the fundamental IPC API over channels!
# (think `yield from`, `gen.send()`, and functional reactive stuff)
if resptype == 'yield': # stream response
async def yield_from_q():
async def yield_from_recvchan():
async with recv_chan:
try:
async for msg in q:
async for msg in recv_chan:
try:
yield msg['yield']
except KeyError:
@ -142,7 +151,7 @@ class Portal:
"Received internal error at portal?")
raise unpack_error(msg, self.channel)
except (GeneratorExit, trio.Cancelled):
except (GeneratorExit, trio.Cancelled) as err:
log.warning(
f"Cancelling async gen call {cid} to "
f"{self.channel.uid}")
@ -152,26 +161,27 @@ class Portal:
# async func on the far end. Gotta figure out a
# better way then implicitly feeding the ctx
# to declaring functions; likely a decorator
# sytsem.
agen = await self.run('self', 'cancel_task', cid=cid)
# system.
agen = await self.run(
'self', 'cancel_task', cid=cid)
async with aclosing(agen) as agen:
async for _ in agen:
pass
if cs.cancelled_caught:
if not self.channel.connected():
log.warning(
"May have failed to cancel remote task "
f"{cid} for {self.channel.uid}")
raise
# TODO: use AsyncExitStack to aclose() all agens
# on teardown
agen = yield_from_q()
agen = yield_from_recvchan()
self._agens.add(agen)
return agen
elif resptype == 'return': # single response
msg = await q.get()
msg = await recv_chan.receive()
try:
return msg['return']
except KeyError:
@ -214,17 +224,20 @@ class Portal:
return self._result
async def _cancel_streams(self):
# terminate all locally running async generator
# IPC calls
if self._agens:
log.warning(
f"Cancelling all streams with {self.channel.uid}")
for agen in self._agens:
await agen.aclose()
# async def _cancel_streams(self):
# # terminate all locally running async generator
# # IPC calls
# if self._agens:
# log.warning(
# f"Cancelling all streams with {self.channel.uid}")
# for agen in self._agens:
# await agen.aclose()
async def close(self) -> None:
await self._cancel_streams()
async def aclose(self) -> None:
# TODO: once we move to implementing our own `ReceiveChannel`
# (including remote task cancellation inside its `.aclose()`)
# we'll need to .aclose all those channels here
pass
async def cancel_actor(self) -> bool:
"""Cancel the actor on the other end of this portal.
@ -233,7 +246,7 @@ class Portal:
log.warning("This portal is already closed can't cancel")
return False
await self._cancel_streams()
# await self._cancel_streams()
log.warning(
f"Sending actor cancel request to {self.channel.uid} on "
@ -308,7 +321,7 @@ async def open_portal(
try:
yield portal
finally:
await portal.close()
await portal.aclose()
if was_connected:
# cancel remote channel-msg loop