multi: make OpenChannel take in openChanReq

pilot.go

@@ -37,10 +37,20 @@ func (c *chanController) OpenChannel(target *btcec.PublicKey,
 	// TODO(halseth): make configurable?
 	minHtlc := lnwire.NewMSatFromSatoshis(1)
 
-	updateStream, errChan := c.server.OpenChannel(
-		target, amt, 0, minHtlc, feePerKw, c.private, 0,
-	)
+	// Construct the open channel request and send it to the server to begin
+	// the funding workflow.
+	req := &openChanReq{
+		targetPubkey:    target,
+		chainHash:       *activeNetParams.GenesisHash,
+		localFundingAmt: amt,
+		pushAmt:         0,
+		minHtlc:         minHtlc,
+		fundingFeePerKw: feePerKw,
+		private:         c.private,
+		remoteCsvDelay:  0,
+	}
 
+	updateStream, errChan := c.server.OpenChannel(req)
 	select {
 	case err := <-errChan:
 		// If we were not able to actually open a channel to the peer

rpcserver.go

@@ -813,11 +813,18 @@ func (r *rpcServer) OpenChannel(in *lnrpc.OpenChannelRequest,
 	// Instruct the server to trigger the necessary events to attempt to
 	// open a new channel. A stream is returned in place, this stream will
 	// be used to consume updates of the state of the pending channel.
-	updateChan, errChan := r.server.OpenChannel(
-		nodePubKey, localFundingAmt,
-		lnwire.NewMSatFromSatoshis(remoteInitialBalance),
-		minHtlc, feeRate, in.Private, remoteCsvDelay,
-	)
+	req := &openChanReq{
+		targetPubkey:    nodePubKey,
+		chainHash:       *activeNetParams.GenesisHash,
+		localFundingAmt: localFundingAmt,
+		pushAmt:         lnwire.NewMSatFromSatoshis(remoteInitialBalance),
+		minHtlc:         minHtlc,
+		fundingFeePerKw: feeRate,
+		private:         in.Private,
+		remoteCsvDelay:  remoteCsvDelay,
+	}
+
+	updateChan, errChan := r.server.OpenChannel(req)
 
 	var outpoint wire.OutPoint
 out:
@@ -941,12 +948,18 @@ func (r *rpcServer) OpenChannelSync(ctx context.Context,
 	rpcsLog.Tracef("[openchannel] target sat/kw for funding tx: %v",
 		int64(feeRate))
 
-	updateChan, errChan := r.server.OpenChannel(
-		nodepubKey, localFundingAmt,
-		lnwire.NewMSatFromSatoshis(remoteInitialBalance),
-		minHtlc, feeRate, in.Private, remoteCsvDelay,
-	)
+	req := &openChanReq{
+		targetPubkey:    nodepubKey,
+		chainHash:       *activeNetParams.GenesisHash,
+		localFundingAmt: localFundingAmt,
+		pushAmt:         lnwire.NewMSatFromSatoshis(remoteInitialBalance),
+		minHtlc:         minHtlc,
+		fundingFeePerKw: feeRate,
+		private:         in.Private,
+		remoteCsvDelay:  remoteCsvDelay,
+	}
 
+	updateChan, errChan := r.server.OpenChannel(req)
 	select {
 	// If an error occurs them immediately return the error to the client.
 	case err := <-errChan:

server.go

@@ -2735,77 +2735,45 @@ func (s *server) DisconnectPeer(pubKey *btcec.PublicKey) error {
 // peer identified by nodeKey with the passed channel funding parameters.
 //
 // NOTE: This function is safe for concurrent access.
-func (s *server) OpenChannel(nodeKey *btcec.PublicKey,
-	localAmt btcutil.Amount, pushAmt, minHtlc lnwire.MilliSatoshi,
-	fundingFeePerKw lnwallet.SatPerKWeight, private bool,
-	remoteCsvDelay uint16) (chan *lnrpc.OpenStatusUpdate, chan error) {
+func (s *server) OpenChannel(
+	req *openChanReq) (chan *lnrpc.OpenStatusUpdate, chan error) {
 
-	// The updateChan will have a buffer of 2, since we expect a
-	// ChanPending + a ChanOpen update, and we want to make sure the
-	// funding process is not blocked if the caller is not reading the
-	// updates.
-	updateChan := make(chan *lnrpc.OpenStatusUpdate, 2)
-	errChan := make(chan error, 1)
-
-	var (
-		targetPeer  *peer
-		pubKeyBytes []byte
-		err         error
-	)
-
-	// If the user is targeting the peer by public key, then we'll need to
-	// convert that into a string for our map. Otherwise, we expect them to
-	// target by peer ID instead.
-	if nodeKey != nil {
-		pubKeyBytes = nodeKey.SerializeCompressed()
-	}
+	// The updateChan will have a buffer of 2, since we expect a ChanPending
+	// + a ChanOpen update, and we want to make sure the funding process is
+	// not blocked if the caller is not reading the updates.
+	req.updates = make(chan *lnrpc.OpenStatusUpdate, 2)
+	req.err = make(chan error, 1)
 
 	// First attempt to locate the target peer to open a channel with, if
 	// we're unable to locate the peer then this request will fail.
+	pubKeyBytes := req.targetPubkey.SerializeCompressed()
 	s.mu.RLock()
-	if peer, ok := s.peersByPub[string(pubKeyBytes)]; ok {
-		targetPeer = peer
+	peer, ok := s.peersByPub[string(pubKeyBytes)]
+	if !ok {
+		req.err <- fmt.Errorf("peer %x is not online", pubKeyBytes)
+		return req.updates, req.err
 	}
 	s.mu.RUnlock()
 
-	if targetPeer == nil {
-		errChan <- fmt.Errorf("peer is not connected NodeKey(%x)", pubKeyBytes)
-		return updateChan, errChan
-	}
-
 	// If the fee rate wasn't specified, then we'll use a default
 	// confirmation target.
-	if fundingFeePerKw == 0 {
+	if req.fundingFeePerKw == 0 {
 		estimator := s.cc.feeEstimator
-		fundingFeePerKw, err = estimator.EstimateFeePerKW(6)
+		feeRate, err := estimator.EstimateFeePerKW(6)
 		if err != nil {
-			errChan <- err
-			return updateChan, errChan
+			req.err <- err
+			return req.updates, req.err
 		}
+		req.fundingFeePerKw = feeRate
 	}
 
-	// Spawn a goroutine to send the funding workflow request to the
-	// funding manager. This allows the server to continue handling queries
-	// instead of blocking on this request which is exported as a
-	// synchronous request to the outside world.
-	req := &openChanReq{
-		targetPubkey:    nodeKey,
-		chainHash:       *activeNetParams.GenesisHash,
-		localFundingAmt: localAmt,
-		fundingFeePerKw: fundingFeePerKw,
-		pushAmt:         pushAmt,
-		private:         private,
-		minHtlc:         minHtlc,
-		remoteCsvDelay:  remoteCsvDelay,
-		updates:         updateChan,
-		err:             errChan,
-	}
+	// Spawn a goroutine to send the funding workflow request to the funding
+	// manager. This allows the server to continue handling queries instead
+	// of blocking on this request which is exported as a synchronous
+	// request to the outside world.
+	go s.fundingMgr.initFundingWorkflow(peer, req)
 
-	// TODO(roasbeef): pass in chan that's closed if/when funding succeeds
-	// so can track as persistent peer?
-	go s.fundingMgr.initFundingWorkflow(targetPeer, req)
-
-	return updateChan, errChan
+	return req.updates, req.err
 }
 
 // Peers returns a slice of all active peers.