Move maybe-raise-error-msg logic into context
A context method handling all this logic makes the most sense since it contains all the state related to whether the error should be raised in a nursery scope or is expected to be raised by a consumer task which reads and processes the msg directly (via a `Portal` API call). This also makes it easy to always process remote errors even when there is no (stream) overrun condition.stricter_context_starting
Tyler Goodlet
parent
1f8e1cccbb
commit
c9132de7dc
|
|
@ -650,81 +650,56 @@ class Actor:
|
|||
return
|
||||
|
||||
send_chan = ctx._send_chan
|
||||
assert send_chan
|
||||
|
||||
error = msg.get('error')
|
||||
if error:
|
||||
# If this is an error message from a context opened by
|
||||
# ``Portal.open_context()`` we want to interrupt any ongoing
|
||||
# (child) tasks within that context to be notified of the remote
|
||||
# error relayed here.
|
||||
#
|
||||
# The reason we may want to raise the remote error immediately
|
||||
# is that there is no guarantee the associated local task(s)
|
||||
# will attempt to read from any locally opened stream any time
|
||||
# soon.
|
||||
#
|
||||
# NOTE: this only applies when
|
||||
# ``Portal.open_context()`` has been called since it is assumed
|
||||
# (currently) that other portal APIs (``Portal.run()``,
|
||||
# ``.run_in_actor()``) do their own error checking at the point
|
||||
# of the call and result processing.
|
||||
log.warning(f'Remote context for {chan.uid}:{cid} errored {msg}')
|
||||
ctx._maybe_error_from_remote_msg(msg)
|
||||
log.runtime(f"Delivering {msg} from {chan.uid} to caller {cid}")
|
||||
|
||||
# XXX: we do **not** maintain backpressure and instead
|
||||
# opt to relay stream overrun errors to the sender.
|
||||
try:
|
||||
log.runtime(f"Delivering {msg} from {chan.uid} to caller {cid}")
|
||||
send_chan.send_nowait(msg)
|
||||
# if an error is deteced we should always
|
||||
# expect it to be raised by any context (stream)
|
||||
# consumer task
|
||||
await ctx._maybe_raise_from_remote_msg(msg)
|
||||
|
||||
# XXX: we do **not** maintain backpressure and instead
|
||||
# opt to relay stream overrun errors to the sender.
|
||||
try:
|
||||
send_chan.send_nowait(msg)
|
||||
except trio.WouldBlock:
|
||||
except trio.WouldBlock:
|
||||
# XXX: always push an error even if the local
|
||||
# receiver is in overrun state.
|
||||
await ctx._maybe_raise_from_remote_msg(msg)
|
||||
|
||||
# XXX: do we need this?
|
||||
# if we're trying to push an error but we're in
|
||||
# an overrun state we'll just get stuck sending
|
||||
# the error that was sent to us back to it's sender
|
||||
# instead of it actually being raises in the target
|
||||
# task..
|
||||
# if error:
|
||||
# raise unpack_error(msg, chan) from None
|
||||
uid = chan.uid
|
||||
lines = [
|
||||
'Task context stream was overrun',
|
||||
f'local task: {cid} @ {self.uid}',
|
||||
f'remote sender: {uid}',
|
||||
]
|
||||
if not ctx._stream_opened:
|
||||
lines.insert(
|
||||
1,
|
||||
f'\n*** No stream open on `{self.uid[0]}` side! ***\n'
|
||||
)
|
||||
text = '\n'.join(lines)
|
||||
|
||||
uid = chan.uid
|
||||
|
||||
lines = [
|
||||
'Task context stream was overrun',
|
||||
f'local task: {cid} @ {self.uid}',
|
||||
f'remote sender: {chan.uid}',
|
||||
]
|
||||
if not ctx._stream_opened:
|
||||
lines.insert(
|
||||
1,
|
||||
f'\n*** No stream open on `{self.uid[0]}` side! ***\n'
|
||||
)
|
||||
|
||||
text = '\n'.join(lines)
|
||||
if ctx._backpressure:
|
||||
log.warning(text)
|
||||
if ctx._backpressure:
|
||||
await send_chan.send(msg)
|
||||
else:
|
||||
await send_chan.send(msg)
|
||||
else:
|
||||
try:
|
||||
raise StreamOverrun(text) from None
|
||||
except StreamOverrun as err:
|
||||
err_msg = pack_error(err)
|
||||
err_msg['cid'] = cid
|
||||
try:
|
||||
raise StreamOverrun(text) from None
|
||||
except StreamOverrun as err:
|
||||
err_msg = pack_error(err)
|
||||
err_msg['cid'] = cid
|
||||
# TODO: what is the right way to handle the case where the
|
||||
# local task has already sent a 'stop' / StopAsyncInteration
|
||||
# to the other side but and possibly has closed the local
|
||||
# feeder mem chan? Do we wait for some kind of ack or just
|
||||
# let this fail silently and bubble up (currently)?
|
||||
await chan.send(err_msg)
|
||||
|
||||
except trio.BrokenResourceError:
|
||||
# TODO: what is the right way to handle the case where the
|
||||
# local task has already sent a 'stop' / StopAsyncInteration
|
||||
# to the other side but and possibly has closed the local
|
||||
# feeder mem chan? Do we wait for some kind of ack or just
|
||||
# let this fail silently and bubble up (currently)?
|
||||
|
||||
# XXX: local consumer has closed their side
|
||||
# so cancel the far end streaming task
|
||||
log.warning(f"{send_chan} consumer is already closed")
|
||||
except trio.BrokenResourceError:
|
||||
# XXX: local consumer has closed their side
|
||||
# so cancel the far end streaming task
|
||||
log.warning(f"{send_chan} consumer is already closed")
|
||||
|
||||
def get_context(
|
||||
self,
|
||||
|
|
|
|||
|
|
@ -364,33 +364,55 @@ class Context:
|
|||
async def send_stop(self) -> None:
|
||||
await self.chan.send({'stop': True, 'cid': self.cid})
|
||||
|
||||
def _maybe_error_from_remote_msg(
|
||||
async def _maybe_raise_from_remote_msg(
|
||||
self,
|
||||
msg: Dict[str, Any],
|
||||
|
||||
) -> None:
|
||||
'''
|
||||
Unpack and raise a msg error into the local scope
|
||||
(Maybe) unpack and raise a msg error into the local scope
|
||||
nursery for this context.
|
||||
|
||||
Acts as a form of "relay" for a remote error raised
|
||||
in the corresponding remote callee task.
|
||||
|
||||
'''
|
||||
self._error = unpack_error(msg, self.chan)
|
||||
error = msg.get('error')
|
||||
if error:
|
||||
# If this is an error message from a context opened by
|
||||
# ``Portal.open_context()`` we want to interrupt any ongoing
|
||||
# (child) tasks within that context to be notified of the remote
|
||||
# error relayed here.
|
||||
#
|
||||
# The reason we may want to raise the remote error immediately
|
||||
# is that there is no guarantee the associated local task(s)
|
||||
# will attempt to read from any locally opened stream any time
|
||||
# soon.
|
||||
#
|
||||
# NOTE: this only applies when
|
||||
# ``Portal.open_context()`` has been called since it is assumed
|
||||
# (currently) that other portal APIs (``Portal.run()``,
|
||||
# ``.run_in_actor()``) do their own error checking at the point
|
||||
# of the call and result processing.
|
||||
log.error(
|
||||
f'Remote context error for {self.chan.uid}:{self.cid}:\n'
|
||||
f'{msg["error"]["tb_str"]}'
|
||||
)
|
||||
# await ctx._maybe_error_from_remote_msg(msg)
|
||||
self._error = unpack_error(msg, self.chan)
|
||||
|
||||
# TODO: tempted to **not** do this by-reraising in a
|
||||
# nursery and instead cancel a surrounding scope, detect
|
||||
# the cancellation, then lookup the error that was set?
|
||||
if self._scope_nursery:
|
||||
# TODO: tempted to **not** do this by-reraising in a
|
||||
# nursery and instead cancel a surrounding scope, detect
|
||||
# the cancellation, then lookup the error that was set?
|
||||
if self._scope_nursery:
|
||||
|
||||
async def raiser():
|
||||
raise self._error from None
|
||||
async def raiser():
|
||||
raise self._error from None
|
||||
|
||||
# from trio.testing import wait_all_tasks_blocked
|
||||
# await wait_all_tasks_blocked()
|
||||
if not self._scope_nursery._closed: # type: ignore
|
||||
self._scope_nursery.start_soon(raiser)
|
||||
# from trio.testing import wait_all_tasks_blocked
|
||||
# await wait_all_tasks_blocked()
|
||||
if not self._scope_nursery._closed: # type: ignore
|
||||
self._scope_nursery.start_soon(raiser)
|
||||
|
||||
async def cancel(self) -> None:
|
||||
'''
|
||||
|
|
|
|||
Loading…
Reference in New Issue