proxy: replace fsnotify with stat-poll watcher and add SIGHUP reload (#685)

The fsnotify-based config watcher does not work reliably when the config
file is bind-mounted into a Docker container as an individual file, and
mishandles k8s ConfigMap projections (atomically swapped symlinks).
Replace it with a small os.Stat-polling watcher and add SIGHUP as an
explicit reload signal.

- new proxy/configwatcher package: 2s os.Stat poller, follows symlinks,
  fires on mtime/size change and on missing -> present transitions
- SIGHUP triggers reload unconditionally (works without --watch-config)
  via the same ConfigFileChangedEvent pipeline so the UI sees identical
  state transitions
- watcher goroutine now exits cleanly on shutdown via a context
- drop github.com/fsnotify/fsnotify dependency

fixes #682

This commit is contained in:

Benson Wong

2026-04-21 23:21:48 -07:00

committed by

GitHub

parent 625b296720

commit 66639e83f7

5 changed files with 322 additions and 43 deletions

									
										go.mod
									
		-1
	
												View File
												
				@@ -4,7 +4,6 @@ go 1.26.1

				require (

					github.com/billziss-gh/golib v0.2.0

					github.com/fsnotify/fsnotify v1.9.0

					github.com/gin-gonic/gin v1.10.0

					github.com/klauspost/compress v1.18.5

					github.com/stretchr/testify v1.9.0