v0.22.0 several enhancements and fixes for security, network, doc, test, packaging

cmd/lw/reload.go

@@ -0,0 +1,36 @@
+package main
+
+import (
+	"strings"
+
+	lconfig "github.com/lixenwraith/config"
+)
+
+// collectConfigChanges folds the queued hints into one snapshot read. Error
+// events describe an unpublished edit and must not restart a healthy service.
+func collectConfigChanges(first string, changes <-chan string) bool {
+	changed := reportConfigEvent(first)
+	// Bound the drain to the currently queued events so a busy writer cannot
+	// starve signal handling. Later events remain queued for the next iteration.
+	for remaining := len(changes); remaining > 0; remaining-- {
+		select {
+		case event, ok := <-changes:
+			if !ok {
+				return changed
+			}
+			changed = reportConfigEvent(event) || changed
+		default:
+			return changed
+		}
+	}
+	return changed
+}
+
+func reportConfigEvent(event string) bool {
+	if event == lconfig.EventFileDeleted || event == lconfig.EventPermissionsChanged ||
+		event == lconfig.EventReloadTimeout || strings.HasPrefix(event, lconfig.EventReloadError+":") {
+		logger.Warn("msg", "Configuration update not applied", "event", event, "action", "keeping current service")
+		return false
+	}
+	return event != ""
+}