cmd/lncli: always consume first message for openchannel/closechannel

This commit modifies the behavior for the commands which open and close
channels on the command line. Previsouly a user needed to use the
`—block` flag in order to get information about any possible errors or
the full progress of a request. This commit alters the behavior
slightly to block until the _first_ message or error is returned from
the gRPC stream.

With this change, the command line usage has a better UX as users
instantly get more information without having to peer into the logs.

cmd/lncli/commands.go

@@ -274,10 +274,6 @@ func openChannel(ctx *cli.Context) error {
 		return err
 	}
 
-	if !ctx.Bool("block") {
-		return nil
-	}
-
 	for {
 		resp, err := stream.Recv()
 		if err == io.EOF {
@@ -287,6 +283,23 @@ func openChannel(ctx *cli.Context) error {
 		}
 
 		switch update := resp.Update.(type) {
+		case *lnrpc.OpenStatusUpdate_ChanPending:
+			txid, err := chainhash.NewHash(update.ChanPending.Txid)
+			if err != nil {
+				return err
+			}
+
+			printJson(struct {
+				FundingTxid string `json:"funding_txid"`
+			}{
+				FundingTxid: txid.String(),
+			},
+			)
+
+			if !ctx.Bool("block") {
+				return nil
+			}
+
 		case *lnrpc.OpenStatusUpdate_ChanOpen:
 			channelPoint := update.ChanOpen.ChannelPoint
 			txid, err := chainhash.NewHash(channelPoint.FundingTxid)
@@ -365,10 +378,6 @@ func closeChannel(ctx *cli.Context) error {
 		return err
 	}
 
-	if !ctx.Bool("block") {
-		return nil
-	}
-
 	for {
 		resp, err := stream.Recv()
 		if err == io.EOF {
@@ -378,6 +387,23 @@ func closeChannel(ctx *cli.Context) error {
 		}
 
 		switch update := resp.Update.(type) {
+		case *lnrpc.CloseStatusUpdate_ClosePending:
+			closingHash := update.ClosePending.Txid
+			txid, err := chainhash.NewHash(closingHash)
+			if err != nil {
+				return err
+			}
+
+			printJson(struct {
+				ClosingTXID string `json:"closing_txid"`
+			}{
+				ClosingTXID: txid.String(),
+			})
+
+			if !ctx.Bool("block") {
+				return nil
+			}
+
 		case *lnrpc.CloseStatusUpdate_ChanClose:
 			closingHash := update.ChanClose.ClosingTxid
 			txid, err := chainhash.NewHash(closingHash)
@@ -391,7 +417,6 @@ func closeChannel(ctx *cli.Context) error {
 				ClosingTXID: txid.String(),
 			})
 		}
-
 	}
 
 	return nil