Windows support

[Joannis]

Adds support to run on Windows platforms.

Depends on:

• Winsock Fixes apple/swift-nio#3433
• Import ucrt on Windows if available apple/swift-nio-extras#294
• Enable 6.2 CI and enable Windows CI swift-server/swift-service-lifecycle#215

Notes

• Temporarily disables FileSystem I/O on Windows only, we should consider moving to NIOFS or fix the code itself. To be decided

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.73%. Comparing base (6ed08fc) to head (1c935b5).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #747      +/-   ##
==========================================
- Coverage   84.29%   83.73%   -0.57%     
==========================================
  Files         117      117              
  Lines        7726     5993    -1733     
==========================================
- Hits         6513     5018    -1495     
+ Misses       1213      975     -238     

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[github-actions]

✅ Pull request no significant performance differences ✅

Summary

New baseline 'pull_request' is WITHIN the 'main' baseline thresholds.

Full Benchmark Comparison

Comparing results between 'main' and 'pull_request'

Host '6267c3918e52' with 4 'x86_64' processors with 15 GB memory, running:
#18~24.04.1-Ubuntu SMP Sat Jun 28 04:46:03 UTC 2025

Router

Router:Echo metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	769	769	769	769	769	769	769	1027
pull_request	769	769	769	769	769	769	769	1003
Δ	0	0	0	0	0	0	0	-24
Improvement %	0	0	0	0	0	0	0	-24

Router:GET metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	468	468	468	468	468	468	468	2907
pull_request	468	468	468	468	468	468	468	2917
Δ	0	0	0	0	0	0	0	10
Improvement %	0	0	0	0	0	0	0	10

Router:Middleware metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	373	373	373	373	373	373	373	2690
pull_request	373	373	373	373	373	373	373	2660
Δ	0	0	0	0	0	0	0	-30
Improvement %	0	0	0	0	0	0	0	-30

Router:PUT metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	1272	1272	1272	1272	1272	1272	1272	809
pull_request	1272	1272	1272	1272	1272	1272	1272	819
Δ	0	0	0	0	0	0	0	10
Improvement %	0	0	0	0	0	0	0	10

Router:Parameters metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	718	718	718	718	718	718	718	2400
pull_request	718	718	718	718	718	718	718	2229
Δ	0	0	0	0	0	0	0	-171
Improvement %	0	0	0	0	0	0	0	-171

RouterBuilder:Middleware metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	372	372	372	372	372	372	372	2688
pull_request	372	372	372	372	372	372	372	2741
Δ	0	0	0	0	0	0	0	53
Improvement %	0	0	0	0	0	0	0	53

TrieRouter:LongPaths metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	11	11	11	11	11	11	11	241
pull_request	11	11	11	11	11	11	11	240
Δ	0	0	0	0	0	0	0	-1
Improvement %	0	0	0	0	0	0	0	-1

TrieRouter:Parameters metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	19	19	19	19	19	19	19	182
pull_request	19	19	19	19	19	19	19	182
Δ	0	0	0	0	0	0	0	0
Improvement %	0	0	0	0	0	0	0	0

TrieRouter:Routing metrics

Malloc (total): results within specified thresholds, fold down for details.

Malloc (total) *	p0	p25	p50	p75	p90	p99	p100	Samples
main	13	13	13	13	13	13	13	236
pull_request	13	13	13	13	13	13	13	237
Δ	0	0	0	0	0	0	0	1
Improvement %	0	0	0	0	0	0	0	1

[adam-fowler]

Most of this is just disabling file operations. I would move to NIOFileSystem but it is still prefixed with an _ indicating it is not final release and breaking changes maybe included. Although now Vapor have moved that seems unlikely.

Can you chase NIO guys about state of release and what their recommendation is. I want them to commit to an fixed API before moving.

[tib]

I’m also curious about the current state of NIO FS. We’re considering using it in the long run.

[Joannis]

I'll chase up in the SSWG tonight