lib: Replace done channel with contexts in and add names to util services (#6166)

lib/syncthing/auditservice.go

@@ -7,7 +7,9 @@
 package syncthing
 
 import (
+	"context"
 	"encoding/json"
+	"fmt"
 	"io"
 
 	"github.com/thejerf/suture"
@@ -29,19 +31,19 @@ func newAuditService(w io.Writer, evLogger events.Logger) *auditService {
 		w:   w,
 		sub: evLogger.Subscribe(events.AllEvents),
 	}
-	s.Service = util.AsService(s.serve)
+	s.Service = util.AsService(s.serve, s.String())
 	return s
 }
 
 // serve runs the audit service.
-func (s *auditService) serve(stop chan struct{}) {
+func (s *auditService) serve(ctx context.Context) {
 	enc := json.NewEncoder(s.w)
 
 	for {
 		select {
 		case ev := <-s.sub.C():
 			enc.Encode(ev)
-		case <-stop:
+		case <-ctx.Done():
 			return
 		}
 	}
@@ -52,3 +54,7 @@ func (s *auditService) Stop() {
 	s.Service.Stop()
 	s.sub.Unsubscribe()
 }
+
+func (s *auditService) String() string {
+	return fmt.Sprintf("auditService@%p", s)
+}