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cmd/lncli: add closeallchannels command

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In this commit, we add a new closeallchannels command to lncli. This
command allows us to close all existing active and inactive channels
by closing them cooperatively or unilaterally, respectively.
This commit is contained in:
Wilmer Paulino 2018-01-23 21:34:29 -05:00
parent 51a3cab39c
commit 5705da92f6
No known key found for this signature in database
GPG Key ID: 6DF57B9F9514972F
2 changed files with 268 additions and 36 deletions
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303
cmd/lncli/commands.go
View File

@ -5,6 +5,7 @@ import (
"bytes"
"encoding/hex"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
@ -13,6 +14,7 @@ import (
"os/exec"
"strconv"
"strings"
"sync"
"syscall"
"github.com/awalterschulze/gographviz"
@ -600,18 +602,17 @@ var closeChannelCommand = cli.Command{
Name: "closechannel",
Usage: "Close an existing channel.",
Description: `
Close an existing channel. The channel can be closed either cooperatively,
Close an existing channel. The channel can be closed either cooperatively,
or unilaterally (--force).
A unilateral channel closure means that the latest commitment
transaction will be broadcast to the network. As a result, any settled
funds will be time locked for a few blocks before they can be swept int
lnd's wallet.
funds will be time locked for a few blocks before they can be spent.
In the case of a cooperative closure, One can manually set the fee to
be used for the closing transaction via either the --conf_target or
--sat_per_byte arguments. This will be the starting value used during
fee negotiation. This is optional.`,
fee negotiation. This is optional.`,
ArgsUsage: "funding_txid [output_index [time_limit]]",
Flags: []cli.Flag{
cli.StringFlag{
@ -654,17 +655,10 @@ var closeChannelCommand = cli.Command{
}
func closeChannel(ctx *cli.Context) error {
ctxb := context.Background()
client, cleanUp := getClient(ctx)
defer cleanUp()
args := ctx.Args()
var (
txid string
err error
)
// Show command help if no arguments provided
// Show command help if no arguments and flags were provided.
if ctx.NArg() == 0 && ctx.NumFlags() == 0 {
cli.ShowCommandHelp(ctx, "closechannel")
return nil
@ -678,25 +672,27 @@ func closeChannel(ctx *cli.Context) error {
SatPerByte: ctx.Int64("sat_per_byte"),
}
args := ctx.Args()
switch {
case ctx.IsSet("funding_txid"):
txid = ctx.String("funding_txid")
req.ChannelPoint.FundingTxid = &lnrpc.ChannelPoint_FundingTxidStr{
FundingTxidStr: ctx.String("funding_txid"),
}
case args.Present():
txid = args.First()
req.ChannelPoint.FundingTxid = &lnrpc.ChannelPoint_FundingTxidStr{
FundingTxidStr: args.First(),
}
args = args.Tail()
default:
return fmt.Errorf("funding txid argument missing")
}
req.ChannelPoint.FundingTxid = &lnrpc.ChannelPoint_FundingTxidStr{
FundingTxidStr: txid,
}
switch {
case ctx.IsSet("output_index"):
req.ChannelPoint.OutputIndex = uint32(ctx.Int("output_index"))
case args.Present():
index, err := strconv.ParseInt(args.First(), 10, 32)
index, err := strconv.ParseUint(args.First(), 10, 32)
if err != nil {
return fmt.Errorf("unable to decode output index: %v", err)
}
@ -705,7 +701,46 @@ func closeChannel(ctx *cli.Context) error {
req.ChannelPoint.OutputIndex = 0
}
stream, err := client.CloseChannel(ctxb, req)
// After parsing the request, we'll spin up a goroutine that will
// retrieve the closing transaction ID when attempting to close the
// channel. We do this to because `executeChannelClose` can block, so we
// would like to present the closing transaction ID to the user as soon
// as it is broadcasted.
var wg sync.WaitGroup
txidChan := make(chan string, 1)
wg.Add(1)
go func() {
defer wg.Done()
printJSON(struct {
ClosingTxid string `json:"closing_txid"`
}{
ClosingTxid: <-txidChan,
})
}()
err := executeChannelClose(client, req, txidChan, ctx.Bool("block"))
if err != nil {
return err
}
// In the case that the user did not provide the `block` flag, then we
// need to wait for the goroutine to be done to prevent it from being
// destroyed when exiting before printing the closing transaction ID.
wg.Wait()
return nil
}
// executeChannelClose attempts to close the channel from a request. The closing
// transaction ID is sent through `txidChan` as soon as it is broadcasted to the
// network. The block boolean is used to determine if we should block until the
// closing transaction receives all of its required confirmations.
func executeChannelClose(client lnrpc.LightningClient, req *lnrpc.CloseChannelRequest,
txidChan chan<- string, block bool) error {
stream, err := client.CloseChannel(context.Background(), req)
if err != nil {
return err
}
@ -726,28 +761,224 @@ func closeChannel(ctx *cli.Context) error {
return err
}
printJSON(struct {
ClosingTXID string `json:"closing_txid"`
}{
ClosingTXID: txid.String(),
})
txidChan <- txid.String()
if !ctx.Bool("block") {
if !block {
return nil
}
case *lnrpc.CloseStatusUpdate_ChanClose:
closingHash := update.ChanClose.ClosingTxid
txid, err := chainhash.NewHash(closingHash)
return nil
}
}
}
var closeAllChannelsCommand = cli.Command{
Name: "closeallchannels",
Usage: "Close all existing channels.",
Description: `
Close all existing channels.
Channels will be closed either cooperatively or unilaterally, depending
on whether the channel is active or not. If the channel is inactive, any
settled funds within it will be time locked for a few blocks before they
can be spent.
One can request to close inactive channels only by using the
--inactive_only flag.
By default, one is prompted for confirmation every time an inactive
channel is requested to be closed. To avoid this, one can set the
--force flag, which will only prompt for confirmation once for all
inactive channels and proceed to close them.`,
Flags: []cli.Flag{
cli.BoolFlag{
Name: "inactive_only",
Usage: "close inactive channels only",
},
cli.BoolFlag{
Name: "force",
Usage: "ask for confirmation once before attempting " +
"to close existing channels",
},
},
Action: actionDecorator(closeAllChannels),
}
func closeAllChannels(ctx *cli.Context) error {
client, cleanUp := getClient(ctx)
defer cleanUp()
listReq := &lnrpc.ListChannelsRequest{}
openChannels, err := client.ListChannels(context.Background(), listReq)
if err != nil {
return fmt.Errorf("unable to fetch open channels: %v", err)
}
if len(openChannels.Channels) == 0 {
return errors.New("no open channels to close")
}
var channelsToClose []*lnrpc.ActiveChannel
switch {
case ctx.Bool("force") && ctx.Bool("inactive_only"):
msg := "Unilaterally close all inactive channels? The funds " +
"within these channels will be locked for some blocks " +
"(CSV delay) before they can be spent. (yes/no): "
confirmed := promptForConfirmation(msg)
// We can safely exit if the user did not confirm.
if !confirmed {
return nil
}
// Go through the list of open channels and only add inactive
// channels to the closing list.
for _, channel := range openChannels.Channels {
if !channel.GetActive() {
channelsToClose = append(
channelsToClose, channel,
)
}
}
case ctx.Bool("force"):
msg := "Close all active and inactive channels? Inactive " +
"channels will be closed unilaterally, so funds " +
"within them will be locked for a few blocks (CSV " +
"delay) before they can be spent. (yes/no): "
confirmed := promptForConfirmation(msg)
// We can safely exit if the user did not confirm.
if !confirmed {
return nil
}
channelsToClose = openChannels.Channels
default:
// Go through the list of open channels and determine which
// should be added to the closing list.
for _, channel := range openChannels.Channels {
// If the channel is inactive, we'll attempt to
// unilaterally close the channel, so we should prompt
// the user for confirmation beforehand.
if !channel.GetActive() {
msg := fmt.Sprintf("Unilaterally close channel "+
"with node %s and channel point %s? "+
"The closing transaction will need %d "+
"confirmations before the funds can be "+
"spent. (yes/no): ", channel.RemotePubkey,
channel.ChannelPoint, channel.CsvDelay)
confirmed := promptForConfirmation(msg)
if confirmed {
channelsToClose = append(
channelsToClose, channel,
)
}
} else if !ctx.Bool("inactive_only") {
// Otherwise, we'll only add active channels if
// we were not requested to close inactive
// channels only.
channelsToClose = append(
channelsToClose, channel,
)
}
}
}
// result defines the result of closing a channel. The closing
// transaction ID is populated if a channel is successfully closed.
// Otherwise, the error that prevented closing the channel is populated.
type result struct {
RemotePubKey string `json:"remote_pub_key"`
ChannelPoint string `json:"channel_point"`
ClosingTxid string `json:"closing_txid"`
FailErr string `json:"error"`
}
// Launch each channel closure in a goroutine in order to execute them
// in parallel. Once they're all executed, we will print the results as
// they come.
resultChan := make(chan result, len(channelsToClose))
for _, channel := range channelsToClose {
go func(channel *lnrpc.ActiveChannel) {
res := result{}
res.RemotePubKey = channel.RemotePubkey
res.ChannelPoint = channel.ChannelPoint
defer func() {
resultChan <- res
}()
// Parse the channel point in order to create the close
// channel request.
s := strings.Split(res.ChannelPoint, ":")
if len(s) != 2 {
res.FailErr = "expected channel point with " +
"format txid:index"
return
}
index, err := strconv.ParseUint(s[1], 10, 32)
if err != nil {
return err
res.FailErr = fmt.Sprintf("unable to parse "+
"channel point output index: %v", err)
return
}
printJSON(struct {
ClosingTXID string `json:"closing_txid"`
}{
ClosingTXID: txid.String(),
})
req := &lnrpc.CloseChannelRequest{
ChannelPoint: &lnrpc.ChannelPoint{
FundingTxid: &lnrpc.ChannelPoint_FundingTxidStr{
FundingTxidStr: s[0],
},
OutputIndex: uint32(index),
},
Force: !channel.GetActive(),
}
txidChan := make(chan string, 1)
err = executeChannelClose(client, req, txidChan, false)
if err != nil {
res.FailErr = fmt.Sprintf("unable to close "+
"channel: %v", err)
return
}
res.ClosingTxid = <-txidChan
}(channel)
}
for range channelsToClose {
res := <-resultChan
printJSON(res)
}
return nil
}
// promptForConfirmation continuously prompts the user for the message until
// receiving a response of "yes" or "no" and returns their answer as a bool.
func promptForConfirmation(msg string) bool {
reader := bufio.NewReader(os.Stdin)
for {
fmt.Print(msg)
answer, err := reader.ReadString('\n')
if err != nil {
return false
}
answer = strings.ToLower(strings.TrimSpace(answer))
switch {
case answer == "yes":
return true
case answer == "no":
return false
default:
continue
}
}
}

1
cmd/lncli/main.go
View File

@ -170,6 +170,7 @@ func main() {
disconnectCommand,
openChannelCommand,
closeChannelCommand,
closeAllChannelsCommand,
listPeersCommand,
walletBalanceCommand,
channelBalanceCommand,