GODT-1657: Stable sync (still needs more tests)

internal/user/sync_reporter.go

@@ -0,0 +1,55 @@
+package user
+
+import (
+	"time"
+
+	"github.com/ProtonMail/gluon/queue"
+	"github.com/ProtonMail/proton-bridge/v2/internal/events"
+)
+
+type reporter struct {
+	userID  string
+	eventCh *queue.QueuedChannel[events.Event]
+
+	start time.Time
+	total int
+	count int
+
+	last time.Time
+	freq time.Duration
+}
+
+func newReporter(userID string, eventCh *queue.QueuedChannel[events.Event], total int, freq time.Duration) *reporter {
+	return &reporter{
+		userID:  userID,
+		eventCh: eventCh,
+
+		start: time.Now(),
+		total: total,
+		freq:  freq,
+	}
+}
+
+func (rep *reporter) add(delta int) {
+	rep.count += delta
+
+	if time.Since(rep.last) > rep.freq {
+		rep.eventCh.Enqueue(events.SyncProgress{
+			UserID:    rep.userID,
+			Progress:  float64(rep.count) / float64(rep.total),
+			Elapsed:   time.Since(rep.start),
+			Remaining: time.Since(rep.start) * time.Duration(rep.total-(rep.count+1)) / time.Duration(rep.count+1),
+		})
+
+		rep.last = time.Now()
+	}
+}
+
+func (rep *reporter) done() {
+	rep.eventCh.Enqueue(events.SyncProgress{
+		UserID:    rep.userID,
+		Progress:  1,
+		Elapsed:   time.Since(rep.start),
+		Remaining: 0,
+	})
+}