vspd: Listen for dcrd notifs after startup.

Only attach the dcrd notification listener after all other startup tasks
have been completed.

Attaching the listener before this can result in the notification
handler being invoked whilst startup tasks are still running, which
isn't necessarily a problem, but it is unnecessary and makes a mess of
logging.

cmd/vspd/main.go

@@ -100,44 +100,6 @@ func run() int {
 	wallets := rpc.SetupWallet(cfg.walletUsers, cfg.walletPasswords, cfg.walletHosts, cfg.walletCerts, cfg.netParams.Params, rpcLog)
 	defer wallets.Close()
 
-	// Create a channel to receive blockConnected notifications from dcrd.
-	notifChan := make(chan *wire.BlockHeader)
-	shutdownWg.Add(1)
-	go func() {
-		for {
-			select {
-			case <-shutdownCtx.Done():
-				shutdownWg.Done()
-				return
-			case header := <-notifChan:
-				log.Debugf("Block notification %d (%s)", header.Height, header.BlockHash().String())
-				blockConnected(dcrd, wallets, db, log)
-			}
-		}
-	}()
-
-	// Attach notification listener to dcrd client.
-	dcrd.BlockConnectedHandler(notifChan)
-
-	// Loop forever attempting ensuring a dcrd connection is available, so
-	// notifications are received.
-	shutdownWg.Add(1)
-	go func() {
-		for {
-			select {
-			case <-shutdownCtx.Done():
-				shutdownWg.Done()
-				return
-			case <-time.After(time.Second * 15):
-				// Ensure dcrd client is still connected.
-				_, _, err := dcrd.Client()
-				if err != nil {
-					log.Errorf("dcrd connect error: %v", err)
-				}
-			}
-		}
-	}()
-
 	// Ensure all data in database is present and up-to-date.
 	err = db.CheckIntegrity(dcrd)
 	if err != nil {
@@ -190,6 +152,44 @@ func run() int {
 		return 1
 	}
 
+	// Create a channel to receive blockConnected notifications from dcrd.
+	notifChan := make(chan *wire.BlockHeader)
+	shutdownWg.Add(1)
+	go func() {
+		for {
+			select {
+			case <-shutdownCtx.Done():
+				shutdownWg.Done()
+				return
+			case header := <-notifChan:
+				log.Debugf("Block notification %d (%s)", header.Height, header.BlockHash().String())
+				blockConnected(dcrd, wallets, db, log)
+			}
+		}
+	}()
+
+	// Attach notification listener to dcrd client.
+	dcrd.BlockConnectedHandler(notifChan)
+
+	// Loop forever attempting ensuring a dcrd connection is available, so
+	// notifications are received.
+	shutdownWg.Add(1)
+	go func() {
+		for {
+			select {
+			case <-shutdownCtx.Done():
+				shutdownWg.Done()
+				return
+			case <-time.After(time.Second * 15):
+				// Ensure dcrd client is still connected.
+				_, _, err := dcrd.Client()
+				if err != nil {
+					log.Errorf("dcrd connect error: %v", err)
+				}
+			}
+		}
+	}()
+
 	// Wait for shutdown tasks to complete before running deferred tasks and
 	// returning.
 	shutdownWg.Wait()