lncli: add bumpchannelclose command
This command allows users to easily bump the fee on their unconfirmed closing transactions.
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d60303b092
commit
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@ -4,8 +4,12 @@ package main
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import (
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import (
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"context"
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"context"
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"errors"
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"fmt"
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"sort"
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"sort"
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"github.com/btcsuite/btcd/chaincfg/chainhash"
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"github.com/lightningnetwork/lnd/lnrpc"
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"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
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"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
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"github.com/urfave/cli"
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"github.com/urfave/cli"
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)
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)
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@ -22,6 +26,7 @@ func walletCommands() []cli.Command {
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Subcommands: []cli.Command{
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Subcommands: []cli.Command{
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pendingSweepsCommand,
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pendingSweepsCommand,
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bumpFeeCommand,
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bumpFeeCommand,
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bumpCloseFeeCommand,
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},
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},
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},
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},
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}
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}
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@ -168,3 +173,130 @@ func bumpFee(ctx *cli.Context) error {
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return nil
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return nil
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}
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}
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var bumpCloseFeeCommand = cli.Command{
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Name: "bumpclosefee",
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Usage: "Bumps the fee of a channel closing transaction.",
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ArgsUsage: "channel_point",
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Description: `
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This command allows the fee of a channel closing transaction to be
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increased by using the child-pays-for-parent mechanism. It will instruct
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the sweeper to sweep the anchor outputs of transactions in the set
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of valid commitments for the specified channel at the requested fee
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rate or confirmation target.
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`,
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Flags: []cli.Flag{
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cli.Uint64Flag{
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Name: "conf_target",
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Usage: "the number of blocks that the output should " +
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"be swept on-chain within",
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},
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cli.Uint64Flag{
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Name: "sat_per_byte",
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Usage: "a manual fee expressed in sat/byte that " +
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"should be used when sweeping the output",
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},
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},
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Action: actionDecorator(bumpCloseFee),
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}
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func bumpCloseFee(ctx *cli.Context) error {
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// Display the command's help message if we do not have the expected
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// number of arguments/flags.
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if ctx.NArg() != 1 {
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return cli.ShowCommandHelp(ctx, "bumpclosefee")
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}
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// Validate the channel point.
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channelPoint := ctx.Args().Get(0)
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_, err := NewProtoOutPoint(channelPoint)
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if err != nil {
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return err
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}
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// Fetch all waiting close channels.
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client, cleanUp := getClient(ctx)
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defer cleanUp()
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// Fetch waiting close channel commitments.
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commitments, err := getWaitingCloseCommitments(client, channelPoint)
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if err != nil {
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return err
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}
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// Retrieve pending sweeps.
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walletClient, cleanUp := getWalletClient(ctx)
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defer cleanUp()
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ctxb := context.Background()
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sweeps, err := walletClient.PendingSweeps(
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ctxb, &walletrpc.PendingSweepsRequest{},
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)
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if err != nil {
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return err
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}
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// Match pending sweeps with commitments of the channel for which a bump
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// is requested and bump their fees.
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commitSet := map[string]struct{}{
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commitments.LocalTxid: {},
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commitments.RemoteTxid: {},
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}
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if commitments.RemotePendingTxid != "" {
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commitSet[commitments.RemotePendingTxid] = struct{}{}
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}
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for _, sweep := range sweeps.PendingSweeps {
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// Only bump anchor sweeps.
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if sweep.WitnessType != walletrpc.WitnessType_COMMITMENT_ANCHOR {
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continue
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}
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// Skip unrelated sweeps.
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sweepTxID, err := chainhash.NewHash(sweep.Outpoint.TxidBytes)
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if err != nil {
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return err
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}
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if _, match := commitSet[sweepTxID.String()]; !match {
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continue
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}
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// Bump fee of the anchor sweep.
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fmt.Printf("Bumping fee of %v:%v\n",
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sweepTxID, sweep.Outpoint.OutputIndex)
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_, err = walletClient.BumpFee(ctxb, &walletrpc.BumpFeeRequest{
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Outpoint: sweep.Outpoint,
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TargetConf: uint32(ctx.Uint64("conf_target")),
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SatPerByte: uint32(ctx.Uint64("sat_per_byte")),
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Force: true,
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})
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if err != nil {
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return err
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}
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}
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return nil
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}
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func getWaitingCloseCommitments(client lnrpc.LightningClient,
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channelPoint string) (*lnrpc.PendingChannelsResponse_Commitments,
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error) {
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ctxb := context.Background()
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req := &lnrpc.PendingChannelsRequest{}
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resp, err := client.PendingChannels(ctxb, req)
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if err != nil {
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return nil, err
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}
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// Lookup the channel commit tx hashes.
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for _, channel := range resp.WaitingCloseChannels {
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if channel.Channel.ChannelPoint == channelPoint {
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return channel.Commitments, nil
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}
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}
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return nil, errors.New("channel not found")
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}
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