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https://github.com/lightningnetwork/lnd.git
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peer: ensure link failures are processed in peer life cycle
This commit is contained in:
Conner Fromknecht
parent
2f1b024679
commit
48dc38d9f9
162
peer.go
162
peer.go
@ -148,6 +148,10 @@ type peer struct {
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// a particular channel are sent over.
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localCloseChanReqs chan *htlcswitch.ChanClose
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// linkFailures receives all reported channel failures from the switch,
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// and instructs the channelManager to clean remaining channel state.
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linkFailures chan linkFailureReport
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// chanCloseMsgs is a channel that any message related to channel
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// closures are sent over. This includes lnwire.Shutdown message as
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// well as lnwire.ClosingSigned messages.
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@ -216,6 +220,7 @@ func newPeer(conn net.Conn, connReq *connmgr.ConnReq, server *server,
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activeChanCloses: make(map[lnwire.ChannelID]*channelCloser),
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localCloseChanReqs: make(chan *htlcswitch.ChanClose),
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linkFailures: make(chan linkFailureReport),
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chanCloseMsgs: make(chan *closeMsg),
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failedChannels: make(map[lnwire.ChannelID]struct{}),
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@ -481,80 +486,18 @@ func (p *peer) addLink(chanPoint *wire.OutPoint,
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shortChanID lnwire.ShortChannelID,
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linkErr htlcswitch.LinkFailureError) {
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select {
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// If the server is already exiting, then none of the actions
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// below can finish exiting, so we'll exit early as well.
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case <-p.server.quit:
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return
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default:
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failure := linkFailureReport{
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chanPoint: *chanPoint,
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chanID: chanID,
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shortChanID: shortChanID,
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linkErr: linkErr,
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}
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// The link has notified us about a failure. We launch a go
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// routine to stop the link, disconnect the peer and optionally
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// force close the channel. We must launch a goroutine since we
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// must let OnChannelFailure return in order for the link to
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// completely stop in the call to RemoveLink.
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p.server.wg.Add(1)
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go func() {
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defer p.server.wg.Done()
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// We begin by removing the link from the switch, such
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// that it won't be attempted used for any more
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// updates.
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// TODO(halseth): should introduce a way to atomically
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// stop/pause the link and cancel back any adds in its
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// mailboxes such that we can safely force close
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// without the link being added again and updates being
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// applied.
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p.server.htlcSwitch.RemoveLink(chanID)
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// If the error encountered was severe enough, we'll
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// now force close the channel.
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if linkErr.ForceClose {
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peerLog.Warnf("Force closing link(%v)",
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shortChanID)
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closeTx, err := p.server.chainArb.ForceCloseContract(*chanPoint)
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if err != nil {
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peerLog.Errorf("unable to force close "+
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"link(%v): %v", shortChanID,
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err)
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} else {
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peerLog.Infof("channel(%v) force "+
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"closed with txid %v",
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shortChanID, closeTx.TxHash())
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}
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}
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// Send an error to the peer, why we failed the
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// channel.
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if linkErr.ShouldSendToPeer() {
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// If SendData is set, send it to the peer. If
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// not, we'll use the standard error messages
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// in the payload. We only include sendData in
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// the cases where the error data does not
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// contain sensitive information.
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data := []byte(linkErr.Error())
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if linkErr.SendData != nil {
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data = linkErr.SendData
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}
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err := p.SendMessage(true, &lnwire.Error{
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ChanID: chanID,
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Data: data,
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})
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if err != nil {
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peerLog.Errorf("unable to send msg to "+
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"remote peer: %v", err)
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}
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}
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// Initiate disconnection.
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// TODO(halseth): consider not disconnecting the peer,
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// as we might still have other active channels with
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// the same peer.
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p.Disconnect(linkErr)
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}()
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select {
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case p.linkFailures <- failure:
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case <-p.quit:
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case <-p.server.quit:
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}
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}
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linkCfg := htlcswitch.ChannelLinkConfig{
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@ -1625,6 +1568,12 @@ out:
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case req := <-p.localCloseChanReqs:
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p.handleLocalCloseReq(req)
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// We've received a link failure from a link that was added to
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// the switch. This will initiate the teardown of the link, and
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// initiate any on-chain closures if necessary.
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case failure := <-p.linkFailures:
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p.handleLinkFailure(failure)
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// We've received a new cooperative channel closure related
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// message from the remote peer, we'll use this message to
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// advance the chan closer state machine.
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@ -1873,6 +1822,75 @@ func (p *peer) handleLocalCloseReq(req *htlcswitch.ChanClose) {
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}
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}
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// linkFailureReport is sent to the channelManager whenever a link that was
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// added to the switch reports a link failure, and is forced to exit. The report
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// houses the necessary information to cleanup the channel state, send back the
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// error message, and force close if necessary.
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type linkFailureReport struct {
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chanPoint wire.OutPoint
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chanID lnwire.ChannelID
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shortChanID lnwire.ShortChannelID
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linkErr htlcswitch.LinkFailureError
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}
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// handleLinkFailure processes a link failure report when a link in the switch
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// fails. It handles facilitates removal of all channel state within the peer,
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// force closing the channel depending on severity, and sending the error
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// message back to the remote party.
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func (p *peer) handleLinkFailure(failure linkFailureReport) {
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// We begin by wiping the link, which will remove it from the switch,
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// such that it won't be attempted used for any more updates.
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//
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// TODO(halseth): should introduce a way to atomically stop/pause the
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// link and cancel back any adds in its mailboxes such that we can
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// safely force close without the link being added again and updates
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// being applied.
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if err := p.WipeChannel(&failure.chanPoint); err != nil {
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peerLog.Errorf("Unable to wipe link for chanpoint=%v",
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failure.chanPoint)
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return
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}
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// If the error encountered was severe enough, we'll now force close the
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// channel to prevent readding it to the switch in the future.
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if failure.linkErr.ForceClose {
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peerLog.Warnf("Force closing link(%v)",
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failure.shortChanID)
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closeTx, err := p.server.chainArb.ForceCloseContract(
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failure.chanPoint,
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)
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if err != nil {
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peerLog.Errorf("unable to force close "+
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"link(%v): %v", failure.shortChanID, err)
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} else {
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peerLog.Infof("channel(%v) force "+
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"closed with txid %v",
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failure.shortChanID, closeTx.TxHash())
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}
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}
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// Send an error to the peer, why we failed the channel.
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if failure.linkErr.ShouldSendToPeer() {
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// If SendData is set, send it to the peer. If not, we'll use
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// the standard error messages in the payload. We only include
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// sendData in the cases where the error data does not contain
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// sensitive information.
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data := []byte(failure.linkErr.Error())
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if failure.linkErr.SendData != nil {
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data = failure.linkErr.SendData
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}
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err := p.SendMessage(true, &lnwire.Error{
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ChanID: failure.chanID,
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Data: data,
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})
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if err != nil {
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peerLog.Errorf("unable to send msg to "+
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"remote peer: %v", err)
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}
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}
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}
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// finalizeChanClosure performs the final clean up steps once the cooperative
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// closure transaction has been fully broadcast. The finalized closing state
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// machine should be passed in. Once the transaction has been sufficiently
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