Micro-optimizations and improved IOException error handling

[kyri-petrou]

This PR contains some micro-optimizations and small fixes I run across while working on other issues:

1. Use Netty's headers.get(key) in Headers.Native to obtain a header value. Note that this method uses a case-insensitive key, so the behaviour should be the same as previously. The performant benefit of this depends largely on the number of headers in the request. In the added benchmark, that's ~x5 faster than the current implementation
2. Avoid pattern for converting between zio.http.Status <-> io.netty.handler.codec.http.HttpResponseStatus. Using the status code to do the conversion is both less boilerplate-y but also more performant as the pattern matching can be compiled to a tableswitch.
3. When handling IOException in ServerInboundHandler#exceptionCaught, check if the message is not null and that it contains the Connection reset string. This is because when using native transports (e.g., EPoll, KQueue), the Connection reset message is prefixed by the native method's name
4. Small micro-optimizations to CharSequenceExtensions.compare by checking that the length of the CharSequence is the same prior to iterating the chars, and by avoiding calls to toLower when not necessary. Performance benefit is highly dependent on different factors (in some cases, up to 1 order of magnitude), and is now en par with Java's equalsIgnoreCase method

[codecov-commenter]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (95b773b) 64.89% compared to head (02cfe4f) 65.08%.

Files	Patch %	Lines
...a/zio/http/netty/server/ServerInboundHandler.scala	25.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2638      +/-   ##
==========================================
+ Coverage   64.89%   65.08%   +0.18%     
==========================================
  Files         144      144              
  Lines        8495     8386     -109     
  Branches     1535     1498      -37     
==========================================
- Hits         5513     5458      -55     
+ Misses       2982     2928      -54     

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[987Nabil]

lgtm
But you have to fix the build 🙂

[987Nabil]

Love this change 👍

[987Nabil]

Just for me: Is this an optional hint? Might the compiler create a switch without it? Might the compiler not create a switch with it?

[kyri-petrou]

Might the compiler create a switch without it

Yes

Might the compiler not create a switch with it

No

This is very similar to tailrec; if the compiler can create a lookupswitch or tableswitch, it will do it even without the annotation. However, if the annotation is present, then it'll raise an error if a lookupswitch / tableswitch cannot be created from the expression.

[987Nabil]

Thx! 👍

[kyri-petrou]

But you have to fix the build

@987Nabil CI is failing due to a 502 error from sonatype when fetching dependencies. I think the failing task just needs to be retriggered.