port linkerd2-proxy-error::recover and linkerd2-proxy-resolve to std::future
#518
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Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
Signed-off-by: Eliza Weisman <eliza@buoyant.io>
sadly, recover requires unpin, but i couldn't make it work otherwise Signed-off-by: Eliza Weisman <eliza@buoyant.io>
olix0r
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May 19, 2020
kleimkuhler
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May 19, 2020
hawkw
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May 20, 2020
This branch updates the `linkerd2-proxy-api-resolve` crate to use `std::future` and Tonic. Getting this to work required some upstream changes to linkerd/linkerd2-proxy-api#39 to pass different feature flags to Tonic, but the change here is pretty straigntforward. Depends on #518 and will be rebased onto `master-tokio-02` when that branch merges. Signed-off-by: Eliza Weisman <eliza@buoyant.io>
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This branch updates the
linkerd2-proxy-resolvecrate tostd::future.It also updates the
recovermodule inlinkerd2-proxy-error, which isa dependency of
resolve, andlinkerd2-reconnect, which depends onrecoverand therefore didn't compile after it was updated.The
linkerd2-proxy-resolve::recovercode currently only works when theunderlying resolver's resolution and future types are both
Unpin, andthe backoff type is also
Unpin. This is because this logic relies abit on being able to move these values in and out of
Options. I triedto implement this without requiring these values to be
Unpin, but theimplementation of the
ResolveFuture, which drives the resolution untilit's connected and then returns it, was more or less impossible to
translate in its current state.
I suspect that this won't be an issue when updating code that depends on
recover— I think the resolutions will probably beUnpinwithout anyintervention from us. If not, we can always either
Box::pinthem, ortry to do a more complete rewrite of this code so that it's refactored
in a way that avoids these issues.
In other cases, we can sometimes just replace code that is difficult to
port to use
async/await. Here, that was not possible, because we areimplementing the
Resolutiontrait, rather than a future. We may wantto consider rewriting
Resolutionto be a trait alias for aStream,so that we can use the
async-streamcrate, but that may have otherdownsides, so I decided to not do that just yet.
Hopefully this all makes sense!