lnd: add support for pushing funds as part of channel funding
This commit adds daemon level support for pushing funds as part of the single funder channel workflow. This new feature allows the user to open a channel and simultaneously make a channel at the same time which can improve the UX when setting up a channel for the first time.
This commit is contained in:
Olaoluwa Osuntokun
parent
5f2f77e873
commit
9965640349
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@ -348,8 +348,9 @@ func (f *fundingManager) handleFundingRequest(fmsg *fundingRequestMsg) {
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delay := msg.CsvDelay
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// TODO(roasbeef): error if funding flow already ongoing
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fndgLog.Infof("Recv'd fundingRequest(amt=%v, delay=%v, pendingId=%v) "+
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"from peerID(%v)", amt, delay, msg.ChannelID, fmsg.peer.id)
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fndgLog.Infof("Recv'd fundingRequest(amt=%v, push=%v, delay=%v, pendingId=%v) "+
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"from peerID(%v)", amt, msg.PushSatoshis, delay, msg.ChannelID,
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fmsg.peer.id)
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ourDustLimit := lnwallet.DefaultDustLimit()
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theirDustlimit := msg.DustLimit
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@ -364,7 +365,7 @@ func (f *fundingManager) handleFundingRequest(fmsg *fundingRequestMsg) {
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// port with default advertised port
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reservation, err := f.wallet.InitChannelReservation(amt, 0,
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fmsg.peer.addr.IdentityKey, fmsg.peer.addr.Address, 1, delay,
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ourDustLimit)
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ourDustLimit, msg.PushSatoshis)
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if err != nil {
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// TODO(roasbeef): push ErrorGeneric message
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fndgLog.Errorf("Unable to initialize reservation: %v", err)
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@ -890,14 +891,15 @@ func (f *fundingManager) handleInitFundingMsg(msg *initFundingMsg) {
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fndgLog.Infof("Initiating fundingRequest(localAmt=%v, remoteAmt=%v, "+
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"capacity=%v, numConfs=%v, addr=%v, dustLimit=%v)", localAmt,
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remoteAmt, ourDustLimit, capacity, numConfs,
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msg.peer.addr.Address)
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msg.pushAmt, capacity, numConfs, msg.peer.addr.Address,
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ourDustLimit)
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// Initialize a funding reservation with the local wallet. If the
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// wallet doesn't have enough funds to commit to this channel, then
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// the request will fail, and be aborted.
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reservation, err := f.wallet.InitChannelReservation(capacity, localAmt,
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nodeID, msg.peer.addr.Address, uint16(numConfs), 4, ourDustLimit)
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nodeID, msg.peer.addr.Address, uint16(numConfs), 4,
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ourDustLimit, msg.pushAmt)
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if err != nil {
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msg.err <- err
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return
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@ -951,6 +953,7 @@ func (f *fundingManager) handleInitFundingMsg(msg *initFundingMsg) {
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contribution.MultiSigKey,
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deliveryScript,
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ourDustLimit,
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msg.pushAmt,
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)
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msg.peer.queueMsg(fundingReq, nil)
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}
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31
rpcserver.go
31
rpcserver.go
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@ -233,10 +233,18 @@ func (r *rpcServer) OpenChannel(in *lnrpc.OpenChannelRequest,
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rpcsLog.Tracef("[openchannel] request to peerid(%v) "+
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"allocation(us=%v, them=%v) numconfs=%v", in.TargetPeerId,
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in.LocalFundingAmount, in.RemoteFundingAmount, in.NumConfs)
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in.LocalFundingAmount, in.PushSat, in.NumConfs)
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localFundingAmt := btcutil.Amount(in.LocalFundingAmount)
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remoteFundingAmt := btcutil.Amount(in.RemoteFundingAmount)
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remoteInitialBalance := btcutil.Amount(in.PushSat)
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// Ensure that the initial balance of the remote party (if pushing
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// satoshis) does not execeed the amount the local party has requested
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// for funding.
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if remoteInitialBalance >= localFundingAmt {
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return fmt.Errorf("amount pushed to remote peer for initial " +
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"state must be below the local funding amount")
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}
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// TODO(roasbeef): make it optional
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nodepubKey, err := btcec.ParsePubKey(in.NodePubkey, btcec.S256())
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@ -248,7 +256,7 @@ func (r *rpcServer) OpenChannel(in *lnrpc.OpenChannelRequest,
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// open a new channel. A stream is returned in place, this stream will
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// be used to consume updates of the state of the pending channel.
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updateChan, errChan := r.server.OpenChannel(in.TargetPeerId,
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nodepubKey, localFundingAmt, remoteFundingAmt, in.NumConfs)
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nodepubKey, localFundingAmt, remoteInitialBalance, in.NumConfs)
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var outpoint wire.OutPoint
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out:
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@ -257,7 +265,8 @@ out:
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case err := <-errChan:
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rpcsLog.Errorf("unable to open channel to "+
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"identityPub(%x) nor peerID(%v): %v",
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nodepubKey, in.TargetPeerId, err)
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nodepubKey.SerializeCompressed(),
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in.TargetPeerId, err)
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return err
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case fundingUpdate := <-updateChan:
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rpcsLog.Tracef("[openchannel] sending update: %v",
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@ -299,7 +308,7 @@ func (r *rpcServer) OpenChannelSync(ctx context.Context,
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rpcsLog.Tracef("[openchannel] request to peerid(%v) "+
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"allocation(us=%v, them=%v) numconfs=%v", in.TargetPeerId,
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in.LocalFundingAmount, in.RemoteFundingAmount, in.NumConfs)
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in.LocalFundingAmount, in.PushSat, in.NumConfs)
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// Decode the provided target node's public key, parsing it into a pub
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// key object. For all sync call, byte slices are expected to be
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@ -314,10 +323,18 @@ func (r *rpcServer) OpenChannelSync(ctx context.Context,
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}
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localFundingAmt := btcutil.Amount(in.LocalFundingAmount)
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remoteFundingAmt := btcutil.Amount(in.RemoteFundingAmount)
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remoteInitialBalance := btcutil.Amount(in.PushSat)
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// Ensure that the initial balance of the remote party (if pushing
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// satoshis) does not execeed the amount the local party has requested
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// for funding.
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if remoteInitialBalance >= localFundingAmt {
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return nil, fmt.Errorf("amount pushed to remote peer for " +
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"initial state must be below the local funding amount")
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}
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updateChan, errChan := r.server.OpenChannel(in.TargetPeerId,
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nodepubKey, localFundingAmt, remoteFundingAmt, in.NumConfs)
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nodepubKey, localFundingAmt, remoteInitialBalance, in.NumConfs)
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select {
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// If an error occurs them immediately return the error to the client.
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18
server.go
18
server.go
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@ -566,6 +566,8 @@ type openChanReq struct {
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localFundingAmt btcutil.Amount
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remoteFundingAmt btcutil.Amount
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pushAmt btcutil.Amount
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numConfs uint32
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updates chan *lnrpc.OpenStatusUpdate
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@ -777,20 +779,20 @@ func (s *server) ConnectToPeer(addr *lnwire.NetAddress) (int32, error) {
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// OpenChannel sends a request to the server to open a channel to the specified
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// peer identified by ID with the passed channel funding paramters.
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func (s *server) OpenChannel(peerID int32, nodeKey *btcec.PublicKey,
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localAmt, remoteAmt btcutil.Amount,
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localAmt, pushAmt btcutil.Amount,
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numConfs uint32) (chan *lnrpc.OpenStatusUpdate, chan error) {
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errChan := make(chan error, 1)
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updateChan := make(chan *lnrpc.OpenStatusUpdate, 1)
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req := &openChanReq{
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targetPeerID: peerID,
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targetPubkey: nodeKey,
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localFundingAmt: localAmt,
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remoteFundingAmt: remoteAmt,
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numConfs: numConfs,
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updates: updateChan,
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err: errChan,
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targetPeerID: peerID,
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targetPubkey: nodeKey,
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localFundingAmt: localAmt,
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pushAmt: pushAmt,
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numConfs: numConfs,
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updates: updateChan,
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err: errChan,
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}
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s.queries <- req
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