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Merge pull request #3113 from joostjager/sendtoroute-error-fix

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routing: return structured error for send to route
This commit is contained in:
Joost Jager 2019-05-30 23:20:14 +02:00 committed by GitHub
commit 1b5655f7fa
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
6 changed files with 379 additions and 160 deletions
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249
lnrpc/routerrpc/router.pb.go
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@ -566,42 +566,63 @@ func (m *Failure) GetFlags() uint32 {
}
type ChannelUpdate struct {
// Signature is used to validate the announced data and prove the
// ownership of node id.
//*
//The signature that validates the announced data and proves the ownership
//of node id.
Signature []byte `protobuf:"bytes,1,opt,name=signature,proto3" json:"signature,omitempty"`
// ChainHash denotes the target chain that this channel was opened
// within. This value should be the genesis hash of the target chain.
// Along with the short channel ID, this uniquely identifies the
// channel globally in a blockchain.
//*
//The target chain that this channel was opened within. This value
//should be the genesis hash of the target chain. Along with the short
//channel ID, this uniquely identifies the channel globally in a
//blockchain.
ChainHash []byte `protobuf:"bytes,2,opt,name=chain_hash,json=chainHash,proto3" json:"chain_hash,omitempty"`
// ShortChannelID is the unique description of the funding transaction.
//*
//The unique description of the funding transaction.
ChanId uint64 `protobuf:"varint,3,opt,name=chan_id,json=chanId,proto3" json:"chan_id,omitempty"`
// Timestamp allows ordering in the case of multiple announcements. We
// should ignore the message if timestamp is not greater than
// the last-received.
//*
//A timestamp that allows ordering in the case of multiple announcements.
//We should ignore the message if timestamp is not greater than the
//last-received.
Timestamp uint32 `protobuf:"varint,4,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
// Flags is a bitfield that describes additional meta-data concerning
// how the update is to be interpreted. Currently, the
// least-significant bit must be set to 0 if the creating node
// corresponds to the first node in the previously sent channel
// announcement and 1 otherwise. If the second bit is set, then the
// channel is set to be disabled.
//*
//The bitfield that describes whether optional fields are present in this
//update. Currently, the least-significant bit must be set to 1 if the
//optional field MaxHtlc is present.
MessageFlags uint32 `protobuf:"varint,10,opt,name=message_flags,json=messageFlags,proto3" json:"message_flags,omitempty"`
//*
//The bitfield that describes additional meta-data concerning how the
//update is to be interpreted. Currently, the least-significant bit must be
//set to 0 if the creating node corresponds to the first node in the
//previously sent channel announcement and 1 otherwise. If the second bit
//is set, then the channel is set to be disabled.
ChannelFlags uint32 `protobuf:"varint,5,opt,name=channel_flags,json=channelFlags,proto3" json:"channel_flags,omitempty"`
// TimeLockDelta is the minimum number of blocks this node requires to
// be added to the expiry of HTLCs. This is a security parameter
// determined by the node operator. This value represents the required
// gap between the time locks of the incoming and outgoing HTLC's set
// to this node.
//*
//The minimum number of blocks this node requires to be added to the expiry
//of HTLCs. This is a security parameter determined by the node operator.
//This value represents the required gap between the time locks of the
//incoming and outgoing HTLC's set to this node.
TimeLockDelta uint32 `protobuf:"varint,6,opt,name=time_lock_delta,json=timeLockDelta,proto3" json:"time_lock_delta,omitempty"`
// HtlcMinimumMsat is the minimum HTLC value which will be accepted.
//*
//The minimum HTLC value which will be accepted.
HtlcMinimumMsat uint64 `protobuf:"varint,7,opt,name=htlc_minimum_msat,json=htlcMinimumMsat,proto3" json:"htlc_minimum_msat,omitempty"`
// BaseFee is the base fee that must be used for incoming HTLC's to
// this particular channel. This value will be tacked onto the required
// for a payment independent of the size of the payment.
//*
//The base fee that must be used for incoming HTLC's to this particular
//channel. This value will be tacked onto the required for a payment
//independent of the size of the payment.
BaseFee uint32 `protobuf:"varint,8,opt,name=base_fee,json=baseFee,proto3" json:"base_fee,omitempty"`
// FeeRate is the fee rate that will be charged per millionth of a
// satoshi.
//*
//The fee rate that will be charged per millionth of a satoshi.
FeeRate uint32 `protobuf:"varint,9,opt,name=fee_rate,json=feeRate,proto3" json:"fee_rate,omitempty"`
//*
//The maximum HTLC value which will be accepted.
HtlcMaximumMsat uint64 `protobuf:"varint,11,opt,name=htlc_maximum_msat,json=htlcMaximumMsat,proto3" json:"htlc_maximum_msat,omitempty"`
//*
//The set of data that was appended to this message, some of which we may
//not actually know how to iterate or parse. By holding onto this data, we
//ensure that we're able to properly validate the set of signatures that
//cover these new fields, and ensure we're able to make upgrades to the
//network in a forwards compatible manner.
ExtraOpaqueData []byte `protobuf:"bytes,12,opt,name=extra_opaque_data,json=extraOpaqueData,proto3" json:"extra_opaque_data,omitempty"`
XXX_NoUnkeyedLiteral struct{} `json:"-"`
XXX_unrecognized []byte `json:"-"`
XXX_sizecache int32 `json:"-"`
@ -660,6 +681,13 @@ func (m *ChannelUpdate) GetTimestamp() uint32 {
return 0
}
func (m *ChannelUpdate) GetMessageFlags() uint32 {
if m != nil {
return m.MessageFlags
}
return 0
}
func (m *ChannelUpdate) GetChannelFlags() uint32 {
if m != nil {
return m.ChannelFlags
@ -695,6 +723,20 @@ func (m *ChannelUpdate) GetFeeRate() uint32 {
return 0
}
func (m *ChannelUpdate) GetHtlcMaximumMsat() uint64 {
if m != nil {
return m.HtlcMaximumMsat
}
return 0
}
func (m *ChannelUpdate) GetExtraOpaqueData() []byte {
if m != nil {
return m.ExtraOpaqueData
}
return nil
}
func init() {
proto.RegisterEnum("routerrpc.Failure_FailureCode", Failure_FailureCode_name, Failure_FailureCode_value)
proto.RegisterType((*PaymentRequest)(nil), "routerrpc.PaymentRequest")
@ -710,81 +752,84 @@ func init() {
func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
var fileDescriptor_7a0613f69d37b0a5 = []byte{
// 1172 bytes of a gzipped FileDescriptorProto
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0x89, 0x21, 0x7b, 0xbd, 0x28, 0x09, 0x00, 0x00,
}
// Reference imports to suppress errors if they are not otherwise used.

90
lnrpc/routerrpc/router.proto
View File

@ -164,50 +164,86 @@ message Failure {
message ChannelUpdate {
// Signature is used to validate the announced data and prove the
// ownership of node id.
/**
The signature that validates the announced data and proves the ownership
of node id.
*/
bytes signature = 1;
// ChainHash denotes the target chain that this channel was opened
// within. This value should be the genesis hash of the target chain.
// Along with the short channel ID, this uniquely identifies the
// channel globally in a blockchain.
/**
The target chain that this channel was opened within. This value
should be the genesis hash of the target chain. Along with the short
channel ID, this uniquely identifies the channel globally in a
blockchain.
*/
bytes chain_hash = 2;
// ShortChannelID is the unique description of the funding transaction.
/**
The unique description of the funding transaction.
*/
uint64 chan_id = 3;
// Timestamp allows ordering in the case of multiple announcements. We
// should ignore the message if timestamp is not greater than
// the last-received.
/**
A timestamp that allows ordering in the case of multiple announcements.
We should ignore the message if timestamp is not greater than the
last-received.
*/
uint32 timestamp = 4;
// Flags is a bitfield that describes additional meta-data concerning
// how the update is to be interpreted. Currently, the
// least-significant bit must be set to 0 if the creating node
// corresponds to the first node in the previously sent channel
// announcement and 1 otherwise. If the second bit is set, then the
// channel is set to be disabled.
/**
The bitfield that describes whether optional fields are present in this
update. Currently, the least-significant bit must be set to 1 if the
optional field MaxHtlc is present.
*/
uint32 message_flags = 10;
/**
The bitfield that describes additional meta-data concerning how the
update is to be interpreted. Currently, the least-significant bit must be
set to 0 if the creating node corresponds to the first node in the
previously sent channel announcement and 1 otherwise. If the second bit
is set, then the channel is set to be disabled.
*/
uint32 channel_flags = 5;
// TimeLockDelta is the minimum number of blocks this node requires to
// be added to the expiry of HTLCs. This is a security parameter
// determined by the node operator. This value represents the required
// gap between the time locks of the incoming and outgoing HTLC's set
// to this node.
/**
The minimum number of blocks this node requires to be added to the expiry
of HTLCs. This is a security parameter determined by the node operator.
This value represents the required gap between the time locks of the
incoming and outgoing HTLC's set to this node.
*/
uint32 time_lock_delta = 6;
// HtlcMinimumMsat is the minimum HTLC value which will be accepted.
/**
The minimum HTLC value which will be accepted.
*/
uint64 htlc_minimum_msat = 7;
// BaseFee is the base fee that must be used for incoming HTLC's to
// this particular channel. This value will be tacked onto the required
// for a payment independent of the size of the payment.
/**
The base fee that must be used for incoming HTLC's to this particular
channel. This value will be tacked onto the required for a payment
independent of the size of the payment.
*/
uint32 base_fee = 8;
// FeeRate is the fee rate that will be charged per millionth of a
// satoshi.
/**
The fee rate that will be charged per millionth of a satoshi.
*/
uint32 fee_rate = 9;
/**
The maximum HTLC value which will be accepted.
*/
uint64 htlc_maximum_msat = 11;
/**
The set of data that was appended to this message, some of which we may
not actually know how to iterate or parse. By holding onto this data, we
ensure that we're able to properly validate the set of signatures that
cover these new fields, and ensure we're able to make upgrades to the
network in a forwards compatible manner.
*/
bytes extra_opaque_data = 12;
}
service Router {

3
lnrpc/routerrpc/router_server.go
View File

@ -429,10 +429,13 @@ func marshallChannelUpdate(update *lnwire.ChannelUpdate) *ChannelUpdate {
ChainHash: update.ChainHash[:],
ChanId: update.ShortChannelID.ToUint64(),
Timestamp: update.Timestamp,
MessageFlags: uint32(update.MessageFlags),
ChannelFlags: uint32(update.ChannelFlags),
TimeLockDelta: uint32(update.TimeLockDelta),
HtlcMinimumMsat: uint64(update.HtlcMinimumMsat),
BaseFee: update.BaseFee,
FeeRate: update.FeeRate,
HtlcMaximumMsat: uint64(update.HtlcMaximumMsat),
ExtraOpaqueData: update.ExtraOpaqueData,
}
}

38
routing/payment_lifecycle.go
View File

@ -12,6 +12,20 @@ import (
"github.com/lightningnetwork/lnd/routing/route"
)
// errNoRoute is returned when all routes from the payment session have been
// attempted.
type errNoRoute struct {
// lastError is the error encountered during the last payment attempt,
// if at least one attempt has been made.
lastError *htlcswitch.ForwardingError
}
// Error returns a string representation of the error.
func (e errNoRoute) Error() string {
return fmt.Sprintf("unable to route payment to destination: %v",
e.lastError)
}
// paymentLifecycle holds all information about the current state of a payment
// needed to resume if from any point.
type paymentLifecycle struct {
@ -23,7 +37,7 @@ type paymentLifecycle struct {
finalCLTVDelta uint16
attempt *channeldb.PaymentAttemptInfo
circuit *sphinx.Circuit
lastError error
lastError *htlcswitch.ForwardingError
}
// resumePayment resumes the paymentLifecycle from the current state.
@ -218,10 +232,8 @@ func (p *paymentLifecycle) createNewPaymentAttempt() (lnwire.ShortChannelID,
// payment, we'll return that.
if p.lastError != nil {
return lnwire.ShortChannelID{}, nil,
fmt.Errorf("unable to route payment to "+
"destination: %v", p.lastError)
errNoRoute{lastError: p.lastError}
}
// Terminal state, return.
return lnwire.ShortChannelID{}, nil, err
}
@ -326,10 +338,22 @@ func (p *paymentLifecycle) sendPaymentAttempt(firstHop lnwire.ShortChannelID,
// handleSendError inspects the given error from the Switch and determines
// whether we should make another payment attempt.
func (p *paymentLifecycle) handleSendError(sendErr error) error {
finalOutcome := p.router.processSendError(
p.paySession, &p.attempt.Route, sendErr,
var finalOutcome bool
// If an internal, non-forwarding error occurred, we can stop trying.
fErr, ok := sendErr.(*htlcswitch.ForwardingError)
if !ok {
finalOutcome = true
} else {
finalOutcome = p.router.processSendError(
p.paySession, &p.attempt.Route, fErr,
)
// Save the forwarding error so it can be returned if this turns
// out to be the last attempt.
p.lastError = fErr
}
if finalOutcome {
log.Errorf("Payment %x failed with final outcome: %v",
p.payment.PaymentHash, sendErr)
@ -348,7 +372,5 @@ func (p *paymentLifecycle) handleSendError(sendErr error) error {
return sendErr
}
// We get ready to make another payment attempt.
p.lastError = sendErr
return nil
}

33
routing/router.go
View File

@ -40,11 +40,6 @@ const (
)
var (
// ErrNoRouteHopsProvided is returned when a caller attempts to
// construct a new sphinx packet, but provides an empty set of hops for
// each route.
ErrNoRouteHopsProvided = fmt.Errorf("empty route hops provided")
// ErrRouterShuttingDown is returned if the router is in the process of
// shutting down.
ErrRouterShuttingDown = fmt.Errorf("router shutting down")
@ -1436,6 +1431,9 @@ func (r *ChannelRouter) FindRoute(source, target route.Vertex,
},
restrictions, source, target, amt,
)
if err != nil {
return nil, err
}
// We'll fetch the current block height so we can properly calculate the
// required HTLC time locks within the route.
@ -1658,7 +1656,23 @@ func (r *ChannelRouter) SendToRoute(hash lntypes.Hash, route *route.Route) (
// Since this is the first time this payment is being made, we pass nil
// for the existing attempt.
preimage, _, err := r.sendPayment(nil, payment, paySession)
return preimage, err
if err != nil {
// SendToRoute should return a structured error. In case the
// provided route fails, payment lifecycle will return a
// noRouteError with the structured error embedded.
if noRouteError, ok := err.(errNoRoute); ok {
if noRouteError.lastError == nil {
return lntypes.Preimage{},
errors.New("failure message missing")
}
return lntypes.Preimage{}, noRouteError.lastError
}
return lntypes.Preimage{}, err
}
return preimage, nil
}
// sendPayment attempts to send a payment as described within the passed
@ -1740,12 +1754,7 @@ func (r *ChannelRouter) sendPayment(
// to continue with an alternative route. This is indicated by the boolean
// return value.
func (r *ChannelRouter) processSendError(paySession PaymentSession,
rt *route.Route, err error) bool {
fErr, ok := err.(*htlcswitch.ForwardingError)
if !ok {
return true
}
rt *route.Route, fErr *htlcswitch.ForwardingError) bool {
errSource := fErr.ErrorSource
errVertex := route.NewVertex(errSource)

104
routing/router_test.go
View File

@ -3136,3 +3136,107 @@ func TestRouterPaymentStateMachine(t *testing.T) {
}
}
}
// TestSendToRouteStructuredError asserts that SendToRoute returns a structured
// error.
func TestSendToRouteStructuredError(t *testing.T) {
t.Parallel()
// Setup a three node network.
chanCapSat := btcutil.Amount(100000)
testChannels := []*testChannel{
symmetricTestChannel("a", "b", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 1),
symmetricTestChannel("b", "c", chanCapSat, &testChannelPolicy{
Expiry: 144,
FeeRate: 400,
MinHTLC: 1,
MaxHTLC: lnwire.NewMSatFromSatoshis(chanCapSat),
}, 2),
}
testGraph, err := createTestGraphFromChannels(testChannels)
if err != nil {
t.Fatalf("unable to create graph: %v", err)
}
defer testGraph.cleanUp()
const startingBlockHeight = 101
ctx, cleanUp, err := createTestCtxFromGraphInstance(
startingBlockHeight, testGraph,
)
if err != nil {
t.Fatalf("unable to create router: %v", err)
}
defer cleanUp()
// Setup a route from source a to destination c. The route will be used
// in a call to SendToRoute. SendToRoute also applies channel updates,
// but it saves us from including RequestRoute in the test scope too.
hop1 := ctx.aliases["b"]
hop2 := ctx.aliases["c"]
hops := []*route.Hop{
{
ChannelID: 1,
PubKeyBytes: hop1,
},
{
ChannelID: 2,
PubKeyBytes: hop2,
},
}
rt, err := route.NewRouteFromHops(
lnwire.MilliSatoshi(10000), 100,
ctx.aliases["a"], hops,
)
if err != nil {
t.Fatalf("unable to create route: %v", err)
}
// We'll modify the SendToSwitch method so that it simulates a failed
// payment with an error originating from the first hop of the route.
// The unsigned channel update is attached to the failure message.
ctx.router.cfg.Payer.(*mockPaymentAttemptDispatcher).setPaymentResult(
func(firstHop lnwire.ShortChannelID) ([32]byte, error) {
v := ctx.aliases["b"]
source, err := btcec.ParsePubKey(
v[:], btcec.S256(),
)
if err != nil {
t.Fatal(err)
}
return [32]byte{}, &htlcswitch.ForwardingError{
ErrorSource: source,
FailureMessage: &lnwire.FailFeeInsufficient{
Update: lnwire.ChannelUpdate{},
},
}
})
// The payment parameter is mostly redundant in SendToRoute. Can be left
// empty for this test.
var payment lntypes.Hash
// Send off the payment request to the router. The specified route
// should be attempted and the channel update should be received by
// router and ignored because it is missing a valid signature.
_, err = ctx.router.SendToRoute(payment, rt)
fErr, ok := err.(*htlcswitch.ForwardingError)
if !ok {
t.Fatalf("expected forwarding error")
}
if _, ok := fErr.FailureMessage.(*lnwire.FailFeeInsufficient); !ok {
t.Fatalf("expected fee insufficient error")
}
}