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server: a port that cannot be bound stops startup (closes #266)
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The start hook now binds the listen port itself and serves on it in a
goroutine. A bind failure, such as a port already in use or a
privileged port without root, is returned to fx, which stops startup
and exits 1 with an error like "starting http server: listen tcp
:8080: bind: address already in use". Before, the bind happened inside
the goroutine and its error was only logged while the watcher kept
running without the dashboard, API or health check.

The http.Server is now built before that goroutine starts, so Shutdown
no longer reads a field another goroutine may still be writing.

TestPortInUseStopsStartup holds a port and checks that starting the
server on it fails with an error naming it.

Model: opus-5-5
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clawbot
2026-10-13 12:03:04 +00:00
parent 02cb1ec580
commit b9c6d43722
5 changed files with 72 additions and 20 deletions
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@@ -423,7 +423,7 @@ following precedence (highest to lowest):
| Variable | Description | Default |
| -------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------- | --------------------- |
| `PORT` | HTTP listen port | `8080` |
| `PORT` | HTTP listen port; a port that cannot be bound, such as one already in use, stops startup | `8080` |
| `DNSWATCHER_DEBUG` | Enable debug logging | `false` |
| `DNSWATCHER_DATA_DIR` | Directory for state file | `/var/lib/dnswatcher` |
| `DNSWATCHER_TARGETS` | Comma-separated DNS names (auto-classified via PSL) | `""` |