Mark partially synced addresses.

This change adds a notification handler for the new rescanprogress
notification and takes advantage of the recent rescan manager and
partial syncing support to mark addresses as partially synced.  If the
network connection to btcd is lost or wallet is restarted during a
rescan, a new rescan will start at the earliest block height for any
wallet address, taking partial syncs into consideration.

acctmgr.go

@@ -159,7 +159,22 @@ func (am *AccountManager) rescanListener() {
 			log.Infof("Started rescan at height %d for %d %s", e.StartHeight, n, noun)
 
 		case *RescanProgressMsg:
-			// TODO: mark addresses as partially synced.
+			for acct, addrs := range e.Addresses {
+				for i := range addrs {
+					err := acct.SetSyncStatus(addrs[i], wallet.PartialSync(e.Height))
+					if err != nil {
+						log.Errorf("Error marking address partially synced: %v", err)
+						continue
+					}
+				}
+				am.ds.ScheduleWalletWrite(acct)
+				err := am.ds.FlushAccount(acct)
+				if err != nil {
+					log.Errorf("Could not write rescan progress: %v", err)
+				}
+			}
+
+			log.Infof("Rescanned through block height %d", e.Height)
 
 		case *RescanFinishedMsg:
 			if e.Error != nil {
@@ -169,15 +184,19 @@ func (am *AccountManager) rescanListener() {
 
 			n := 0
 			for acct, addrs := range e.Addresses {
+				n += len(addrs)
 				for i := range addrs {
-					n++
 					err := acct.SetSyncStatus(addrs[i], wallet.FullSync{})
 					if err != nil {
 						log.Errorf("Error marking address synced: %v", err)
 						continue
 					}
 				}
-				AcctMgr.ds.FlushAccount(acct)
+				am.ds.ScheduleWalletWrite(acct)
+				err := am.ds.FlushAccount(acct)
+				if err != nil {
+					log.Errorf("Could not write rescan progress: %v", err)
+				}
 			}
 
 			noun := pickNoun(n, "address", "addresses")

ntfns.go

@@ -56,6 +56,7 @@ var notificationHandlers = map[string]notificationHandler{
 	btcws.BlockDisconnectedNtfnMethod: NtfnBlockDisconnected,
 	btcws.RecvTxNtfnMethod:            NtfnRecvTx,
 	btcws.RedeemingTxNtfnMethod:       NtfnRedeemingTx,
+	btcws.RescanProgressNtfnMethod:    NtfnRescanProgress,
 }
 
 // NtfnRecvTx handles the btcws.RecvTxNtfn notification.
@@ -264,3 +265,18 @@ func NtfnRedeemingTx(n btcjson.Cmd) error {
 
 	return nil
 }
+
+// NtfnRescanProgress handles btcd rescanprogress notifications resulting
+// from a partially completed rescan.
+func NtfnRescanProgress(n btcjson.Cmd) error {
+	cn, ok := n.(*btcws.RescanProgressNtfn)
+	if !ok {
+		return fmt.Errorf("%v handler: unexpected type", n.Method())
+	}
+
+	// Notify the rescan manager of the completed partial progress for
+	// the current rescan.
+	AcctMgr.rm.MarkProgress(cn.LastProcessed)
+
+	return nil
+}