fixes dmsg showing 00000 after successful reconnection

pkg/visor/dmsgtracker/dmsg_tracker.go

@@ -36,8 +36,8 @@ type DmsgTracker struct {
 	ctrl *dmsgctrl.Control // dmsg ctrl
 }
 
-// NewDmsgTracker creates a new DmsgTracker.
-func NewDmsgTracker(ctx context.Context, dmsgC *dmsg.Client, pk cipher.PubKey) (dt *DmsgTracker, err error) {
+// newDmsgTracker creates a new DmsgTracker.
+func newDmsgTracker(ctx context.Context, dmsgC *dmsg.Client, pk cipher.PubKey) (dt *DmsgTracker, err error) {
 	conn, err := dmsgC.DialStream(ctx, dmsg.Addr{PK: pk, Port: skyenv.DmsgCtrlPort})
 	if err != nil {
 		return nil, err
@@ -179,9 +179,6 @@ func (dtm *Manager) updateAllTrackers(ctx context.Context, dts map[cipher.PubKey
 // MustGet obtains a DmsgClientSummary of the client of given pk.
 // If one is not found internally, a new tracker stream is to be established, returning error on failure.
 func (dtm *Manager) MustGet(ctx context.Context, pk cipher.PubKey) (DmsgClientSummary, error) {
-	ctx, cancel := context.WithDeadline(ctx, time.Now().Add(dtm.updateTimeout))
-	defer cancel()
-
 	dtm.mx.Lock()
 	defer dtm.mx.Unlock()
 
@@ -193,7 +190,7 @@ func (dtm *Manager) MustGet(ctx context.Context, pk cipher.PubKey) (DmsgClientSu
 		return e.sum, nil
 	}
 
-	dt, err := NewDmsgTracker(ctx, dtm.dc, pk)
+	dt, err := dtm.mustEstablishTracker(pk)
 	if err != nil {
 		return DmsgClientSummary{}, err
 	}
@@ -214,17 +211,29 @@ func (dtm *Manager) Get(pk cipher.PubKey) (DmsgClientSummary, bool) {
 	return dtm.get(pk)
 }
 
+// mustEstablishTracker creates / re-creates tracker when dmsgTrackerMap entry got deleted, and reconnected.
+func (dtm *Manager) mustEstablishTracker(pk cipher.PubKey) (*DmsgTracker, error) {
+	ctx, cancel := context.WithDeadline(context.Background(), time.Now().Add(dtm.updateTimeout))
+	defer cancel()
+	return newDmsgTracker(ctx, dtm.dc, pk)
+}
+
 // GetBulk obtains bulk dmsg client summaries.
 func (dtm *Manager) GetBulk(pks []cipher.PubKey) []DmsgClientSummary {
 	dtm.mx.Lock()
 	defer dtm.mx.Unlock()
 
+	var err error
 	out := make([]DmsgClientSummary, 0, len(pks))
 
 	for _, pk := range pks {
 		dt, ok := dtm.dm[pk]
 		if !ok {
-			continue
+			dt, err = dtm.mustEstablishTracker(pk)
+			if err != nil {
+				dtm.log.WithError(err).Infoln("failed to re-create dmsgtracker client")
+				continue
+			}
 		}
 		out = append(out, dt.sum)
 	}

pkg/visor/dmsgtracker/dmsg_tracker_test.go

@@ -38,7 +38,7 @@ func TestDmsgTracker_Update(t *testing.T) {
 	// arrange: tracking client
 	cT, err := env.NewClient(&conf)
 	require.NoError(t, err)
-	dt, err := NewDmsgTracker(context.TODO(), cT, cL.LocalPK())
+	dt, err := newDmsgTracker(context.TODO(), cT, cL.LocalPK())
 	require.NoError(t, err)
 
 	// act: attempt update