This makes all tower subcrates have the following lints as warn (rather
than allow): `missing_docs`, `rust_2018_idioms`, `unreachable_pub`, and
`missing_debug_implementations`. In addition, it consistently applies
`deny(warning)` *only* under CI so that deprecations and macro changes in minor
version bumps in dependencies will never cause `tower` crates to stop
compiling, and so that tests can be run even if not all warnings have been
dealt with. See also https://github.com/rust-unofficial/patterns/blob/master/anti_patterns/deny-warnings.md
Note that `tower-reconnect` has the `missing_docs` lint disabled for now
since it contained _no_ documentation previously. Also note that this
patch does not add documentation to the various `new` methods, as they
are considered self-explanatory. They are instead marked as
`#[allow(missing_docs)]`.
Add tower-hedge, a layer that preemptively retries requests which have been
outstanding for longer than a given latency percentile. If either of the original
future or the retry future completes, that value is used. For more information
about hedge requests, see: [The Tail at Scale][1]
[1]: https://cseweb.ucsd.edu/~gmporter/classes/fa17/cse124/post/schedule/p74-dean.pdf
Signed-off-by: Alex Leong <alex@buoyant.io>
Lucio Franco
Juan Alvarez
Jon Gjengset
Taiki Endo
Alex Leong