Improve Stopwatch behavior (#18930)

- Don't send empty stopwatch over and over again, only send once.
- Stop interval to update stopwatch's timer when there is no more stopwatch.

routers/web/events/events.go

@@ -8,15 +8,10 @@ import (
 	"net/http"
 	"time"
 
-	"code.gitea.io/gitea/models"
-	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/context"
-	"code.gitea.io/gitea/modules/convert"
 	"code.gitea.io/gitea/modules/eventsource"
 	"code.gitea.io/gitea/modules/graceful"
-	"code.gitea.io/gitea/modules/json"
 	"code.gitea.io/gitea/modules/log"
-	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/routers/web/auth"
 )
 
@@ -71,8 +66,6 @@ func Events(ctx *context.Context) {
 
 	timer := time.NewTicker(30 * time.Second)
 
-	stopwatchTimer := time.NewTicker(setting.UI.Notification.MinTimeout)
-
 loop:
 	for {
 		select {
@@ -93,32 +86,6 @@ loop:
 		case <-shutdownCtx.Done():
 			go unregister()
 			break loop
-		case <-stopwatchTimer.C:
-			sws, err := models.GetUserStopwatches(ctx.Doer.ID, db.ListOptions{})
-			if err != nil {
-				log.Error("Unable to GetUserStopwatches: %v", err)
-				continue
-			}
-			apiSWs, err := convert.ToStopWatches(sws)
-			if err != nil {
-				log.Error("Unable to APIFormat stopwatches: %v", err)
-				continue
-			}
-			dataBs, err := json.Marshal(apiSWs)
-			if err != nil {
-				log.Error("Unable to marshal stopwatches: %v", err)
-				continue
-			}
-			_, err = (&eventsource.Event{
-				Name: "stopwatches",
-				Data: string(dataBs),
-			}).WriteTo(ctx.Resp)
-			if err != nil {
-				log.Error("Unable to write to EventStream for user %s: %v", ctx.Doer.Name, err)
-				go unregister()
-				break loop
-			}
-			ctx.Resp.Flush()
 		case event, ok := <-messageChan:
 			if !ok {
 				break loop

routers/web/repo/issue_stopwatch.go

@@ -9,7 +9,9 @@ import (
 	"strings"
 
 	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/models/db"
 	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/eventsource"
 )
 
 // IssueStopwatch creates or stops a stopwatch for the given issue.
@@ -59,6 +61,18 @@ func CancelStopwatch(c *context.Context) {
 		return
 	}
 
+	stopwatches, err := models.GetUserStopwatches(c.Doer.ID, db.ListOptions{})
+	if err != nil {
+		c.ServerError("GetUserStopwatches", err)
+		return
+	}
+	if len(stopwatches) == 0 {
+		eventsource.GetManager().SendMessage(c.Doer.ID, &eventsource.Event{
+			Name: "stopwatches",
+			Data: "{}",
+		})
+	}
+
 	url := issue.HTMLURL()
 	c.Redirect(url, http.StatusSeeOther)
 }