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There's a lot of needless boilerplate around the HTTP client, mostly due to manual future implementations. These have been converted to boxed futures. Furthermore, the HasSettings trait has been eliminated, in favor of AsRef.
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The new code definitely looks nicer!
As a follow-up, it might be nice to switch to nightly rust and change the boxed futures to impl Future, at least to run the benchmarks. I'm not too concerned about the performance implications but it would be nice to do a comparison.
I noticed that we're no longer polling Connect readiness. Is that potentially an issue?
| fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
| self.connect.poll_ready(cx).map_err(Into::into) | ||
| fn poll_ready(&mut self, _: &mut Context<'_>) -> Poll<Result<(), Self::Error>> { | ||
| Poll::Ready(Ok(())) |
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shouldn't we still poll the Connect for readiness? IDK if they are ever actually not ready, but this seems like it could be a problem if the impl changed...
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We clone the connect and oneshot, so any polling we do cannot be used, anyway.
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ah, yup, i guess polling it here was never necessary. should maybe have a comment? but, not a big deal.
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This release includes several major changes to the proxy's behavior: - Service profile lookups are now necessary and fundamental to outbound discovery for HTTP traffic. That is, if a service profile lookup is rejected, endpoint discovery will not be performed; and endpoint discovery must succeed for all destinations that are permitted by service profiles. This simplifies caching and buffering to reduce latency (especially under concurrency). - Service discovery is now performed for all TCP traffic, and connections are balanced over endpoints according to connection latency. - This enables mTLS for **all** meshed connections; not just HTTP. - Outbound TCP metrics are now hydrated with endpoint-specific labels. --- * outbound: Cache balancers within profile stack (linkerd/linkerd2-proxy#641) * outbound: Remove unused error type (linkerd/linkerd2-proxy#648) * Eliminate the ConnectAddr trait (linkerd/linkerd2-proxy#649) * profiles: Do not rely on tuples as stack targets (linkerd/linkerd2-proxy#650) * proxy-http: Remove unneeded boilerplate (linkerd/linkerd2-proxy#651) * outbound: Clarify Http target types (linkerd/linkerd2-proxy#653) * outbound: TCP discovery and load balancing (linkerd/linkerd2-proxy#652) * metrics: Add endpoint labels to outbound TCP metrics (linkerd/linkerd2-proxy#654)
olix0r
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Sep 10, 2020
This release includes several major changes to the proxy's behavior: - Service profile lookups are now necessary and fundamental to outbound discovery for HTTP traffic. That is, if a service profile lookup is rejected, endpoint discovery will not be performed; and endpoint discovery must succeed for all destinations that are permitted by service profiles. This simplifies caching and buffering to reduce latency (especially under concurrency). - Service discovery is now performed for all TCP traffic, and connections are balanced over endpoints according to connection latency. - This enables mTLS for **all** meshed connections; not just HTTP. - Outbound TCP metrics are now hydrated with endpoint-specific labels. --- * outbound: Cache balancers within profile stack (linkerd/linkerd2-proxy#641) * outbound: Remove unused error type (linkerd/linkerd2-proxy#648) * Eliminate the ConnectAddr trait (linkerd/linkerd2-proxy#649) * profiles: Do not rely on tuples as stack targets (linkerd/linkerd2-proxy#650) * proxy-http: Remove unneeded boilerplate (linkerd/linkerd2-proxy#651) * outbound: Clarify Http target types (linkerd/linkerd2-proxy#653) * outbound: TCP discovery and load balancing (linkerd/linkerd2-proxy#652) * metrics: Add endpoint labels to outbound TCP metrics (linkerd/linkerd2-proxy#654)
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There's a lot of needless boilerplate around the HTTP client, mostly due
to manual future implementations. These have been converted to boxed
futures.
Furthermore, the HasSettings trait has been eliminated, in favor of
AsRef.