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Don't set `Context._error` to expected `ContextCancelled` 

If the one side of an inter-actor context cancels the other then that
side should always expect back a `ContextCancelled` message. However we
should not set this error in this case (where the cancel request was
sent and a `ContextCancelled` msg was received back) since it may
override some other error that caused the cancellation request to be
sent out in the first place. As an example when a context opens another
context to a peer and some error happens which causes the second peer
context to be cancelled but we want to propagate the original error.

Fixes the issue found in https://github.com/pikers/piker/issues/244
expected_ctx_cancelled
Tyler Goodlet 2021-12-14 23:05:30 -05:00
parent 9650b010de
commit e2139c2bf0
1 changed files with 11 additions and 1 deletions
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12
tractor/_streaming.py
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@ -425,7 +425,17 @@ class Context:
f'Remote context error for {self.chan.uid}:{self.cid}:\n'
f'{msg["error"]["tb_str"]}'
)
self._error = unpack_error(msg, self.chan)
error = unpack_error(msg, self.chan)
if (
isinstance(error, ContextCancelled) and
self._cancel_called
):
# this is an expected cancel request response message
# and we don't need to raise it in scope since it will
# potentially override a real error
return
self._error = error
# TODO: tempted to **not** do this by-reraising in a
# nursery and instead cancel a surrounding scope, detect