fix postprocessing events

Signed-off-by: Jörn Friedrich Dreyer <jfd@butonic.de>

changelog/unreleased/postprocessing-events.md

@@ -2,4 +2,5 @@ Bugfix: increase event processing workers
 
 We increased the number of go routines that pull events from the queue to three and made the number off workers configurable. Furthermore, the postprocessing delay no longer introduces a sleep that slows down pulling of events, but asynchronously triggers the next step.
 
+https://github.com/owncloud/ocis/pull/10385
 https://github.com/owncloud/ocis/pull/10368

services/postprocessing/pkg/service/service.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"sync"
 	"time"
 
 	ctxpkg "github.com/cs3org/reva/v2/pkg/ctx"
@@ -65,12 +66,14 @@ func NewPostprocessingService(ctx context.Context, stream events.Stream, logger
 
 // Run to fulfil Runner interface
 func (pps *PostprocessingService) Run() error {
-	// Spawn workers that'll concurrently work the queue
+	wg := sync.WaitGroup{}
+
 	for i := 0; i < pps.c.Workers; i++ {
-		go (func() {
+		wg.Add(1)
+		go func() {
+			defer wg.Done()
 			for e := range pps.events {
-				err := pps.processEvent(e)
-				if err != nil {
+				if err := pps.processEvent(e); err != nil {
 					switch {
 					case errors.Is(err, ErrFatal):
 						pps.log.Fatal().Err(err).Msg("fatal error - exiting")
@@ -81,8 +84,10 @@ func (pps *PostprocessingService) Run() error {
 					}
 				}
 			}
-		})()
+		}()
 	}
+	wg.Wait()
+
 	return nil
 }