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Cache mapping of methods to protocol handlers #525

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@emcfarlane emcfarlane commented Jun 20, 2023

Remove allocation of an array for each request by mapping the handlers by methods. Follows pattern of caching allow method and content types.

                │  allocs/op  │  allocs/op   vs base           │
Connect/unary-8   247.0 ± ∞ ¹   243.0 ± ∞ ¹  ~ (p=1.000 n=1) ²

@emcfarlane emcfarlane self-assigned this Jun 20, 2023
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Nice!

@emcfarlane emcfarlane merged commit 513111c into main Jun 20, 2023
@emcfarlane emcfarlane deleted the emcfarlane/muxmap branch June 20, 2023 18:00
renovate bot referenced this pull request in open-feature/flagd Jun 27, 2023
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This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[github.com/bufbuild/connect-go](https://togithub.com/bufbuild/connect-go)
| require | minor | `v1.8.0` -> `v1.9.0` |

---

### Release Notes

<details>
<summary>bufbuild/connect-go (github.com/bufbuild/connect-go)</summary>

###
[`v1.9.0`](https://togithub.com/bufbuild/connect-go/releases/tag/v1.9.0)

[Compare
Source](https://togithub.com/bufbuild/connect-go/compare/v1.8.0...v1.9.0)

#### What's Changed

Along with a few new features and bugfixes, this release includes a
variety of internal performance improvements.

[v1.8.0] BenchmarkConnect/unary-12 8415 1305116 ns/op 14449031 B/op 254
allocs/op
[v1.9.0] BenchmarkConnect/unary-12 10443 1151366 ns/op 6024079 B/op 236
allocs/op

##### Enhancements

- Allow clients to set Host in headers by
[@&#8203;emcfarlane](https://togithub.com/emcfarlane) in
[https://github.com/bufbuild/connect-go/pull/522](https://togithub.com/bufbuild/connect-go/pull/522)
- Allow Connect clients to configure max HTTP GET size by
[@&#8203;jhump](https://togithub.com/jhump) in
[https://github.com/bufbuild/connect-go/pull/529](https://togithub.com/bufbuild/connect-go/pull/529)
- Reduce allocations in HTTP routing by
[@&#8203;mattrobenolt](https://togithub.com/mattrobenolt) in
[https://github.com/bufbuild/connect-go/pull/519](https://togithub.com/bufbuild/connect-go/pull/519)
- Cache mapping of methods to protocol handlers by
[@&#8203;emcfarlane](https://togithub.com/emcfarlane) in
[https://github.com/bufbuild/connect-go/pull/525](https://togithub.com/bufbuild/connect-go/pull/525)
- Improve performance of percent encoding by
[@&#8203;emcfarlane](https://togithub.com/emcfarlane) in
[https://github.com/bufbuild/connect-go/pull/531](https://togithub.com/bufbuild/connect-go/pull/531)
- Reduce marshaling allocations with MarshalAppend by
[@&#8203;emcfarlane](https://togithub.com/emcfarlane) in
[https://github.com/bufbuild/connect-go/pull/503](https://togithub.com/bufbuild/connect-go/pull/503)

##### Bugfixes

- Discard unknown JSON fields by default by
[@&#8203;akshayjshah](https://togithub.com/akshayjshah) in
[https://github.com/bufbuild/connect-go/pull/518](https://togithub.com/bufbuild/connect-go/pull/518)
- Canonicalize Connect streaming trailer names by
[@&#8203;jchadwick-buf](https://togithub.com/jchadwick-buf) in
[https://github.com/bufbuild/connect-go/pull/528](https://togithub.com/bufbuild/connect-go/pull/528)

##### Other changes

- Tighten internal lint checks by
[@&#8203;zchee](https://togithub.com/zchee) in
[https://github.com/bufbuild/connect-go/pull/520](https://togithub.com/bufbuild/connect-go/pull/520)
- Simplify code when pooled buffers aren't returned by
[@&#8203;pkwarren](https://togithub.com/pkwarren) in
[https://github.com/bufbuild/connect-go/pull/532](https://togithub.com/bufbuild/connect-go/pull/532)

#### New Contributors

- [@&#8203;zchee](https://togithub.com/zchee) made their first
contribution in
[https://github.com/bufbuild/connect-go/pull/520](https://togithub.com/bufbuild/connect-go/pull/520)
- [@&#8203;emcfarlane](https://togithub.com/emcfarlane) made their first
contribution in
[https://github.com/bufbuild/connect-go/pull/522](https://togithub.com/bufbuild/connect-go/pull/522)

**Full Changelog**:
bufbuild/connect-go@v1.8.0...v1.9.0

</details>

---

### Configuration

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Automerge - At any time (no schedule defined).

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♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the
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🔕 **Ignore**: Close this PR and you won't be reminded about this update
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---

- [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check
this box

---

This PR has been generated by [Mend
Renovate](https://www.mend.io/free-developer-tools/renovate/). View
repository job log
[here](https://developer.mend.io/github/open-feature/flagd).

<!--renovate-debug:eyJjcmVhdGVkSW5WZXIiOiIzNS4xNDEuMyIsInVwZGF0ZWRJblZlciI6IjM1LjE0MS4zIiwidGFyZ2V0QnJhbmNoIjoibWFpbiJ9-->

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
akshayjshah pushed a commit that referenced this pull request Jul 26, 2023
Remove allocation of an array for each request by mapping the handlers
by methods. Follows pattern of caching allow method and content types.

```
                │  allocs/op  │  allocs/op   vs base           │
Connect/unary-8   247.0 ± ∞ ¹   243.0 ± ∞ ¹  ~ (p=1.000 n=1) ²
```
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