Each subsection has to have `serde(default)` to get the behaviour we want
(delete all fields except the ones that have been changed); otherwise, we can
delete only entire sections.
This test doesn't compile in a way that reveals a problem with the design. The
verification service takes a `Request<'msg>` parameterized by the message
lifetime, and returns a future unconstrained by the message lifetime (it hashes
upfront to avoid requiring that `'msg` outlive `call`). But the `Batch`
middleware has the verification service working on its own task, so how can we
ensure that the message lives long enough to be read by the worker task?
The name "Buffer" is changed to "Batch" everywhere, and the worker task is rewritten.
Instead of having Worker implement Future directly, we have a consuming async run() function.
There's a lot of functional overlap between the batch design and tower-buffer's
existing internals, so we'll just vendor its source code and modify it.
If/when we upstream it, we can deduplicate common components.
Prior to this change, we required that services that are canceled do not
have a cancel handle in the `cancel_handles` list, based on the
assumption that the handle must have been removed in the process of
canceling this service.
This doesn't holding up though, because it is currently possible for us
to have the same peer connect to us multiple times, the second connect
removes the cancel handle of the original connect and inserts it's own
cancel handle in its place. In this scenario, when the first service is
polled for readiness it will see that it has been canceled and go to
clean itself up, but when it asserts that it doesn't have a cancel
handle it will see the cancel handle of the second connect event, which
uses the same key as the first connect, and fail its debug assertion.
This change removes that debug assert on the assumption that it is okay
for a peer to connect multiple times consecutively, and that the correct
behavior in that case is to just cancel the first connection and
continue as normal.
Deirdre Connolly
Jane Lusby
Henry de Valence
Alfredo Garcia
dependabot[bot]
Jane Lusby