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routing: local balance check

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This commit is contained in:
Joost Jager 2019-11-21 11:59:17 +01:00
parent c15b0316a2
commit 97344af8f3
No known key found for this signature in database
GPG Key ID: A61B9D4C393C59C7
7 changed files with 250 additions and 131 deletions
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6
channeldb/payments.go
View File

@ -105,6 +105,10 @@ const (
// or the final cltv delta or amount is incorrect.
FailureReasonPaymentDetails FailureReason = 3
// FailureReasonInsufficientBalance indicates that we didn't have enough
// balance to complete the payment.
FailureReasonInsufficientBalance FailureReason = 4
// TODO(halseth): cancel state.
// TODO(joostjager): Add failure reasons for:
@ -122,6 +126,8 @@ func (r FailureReason) String() string {
return "error"
case FailureReasonPaymentDetails:
return "incorrect_payment_details"
case FailureReasonInsufficientBalance:
return "insufficient_balance"
}
return "unknown"

264
lnrpc/routerrpc/router.pb.go
View File

@ -46,6 +46,9 @@ const (
//Payment details incorrect (unknown hash, invalid amt or
//invalid final cltv delta)
PaymentState_FAILED_INCORRECT_PAYMENT_DETAILS PaymentState = 5
//*
//Insufficient local balance.
PaymentState_FAILED_INSUFFICIENT_BALANCE PaymentState = 6
)
var PaymentState_name = map[int32]string{
@ -55,6 +58,7 @@ var PaymentState_name = map[int32]string{
3: "FAILED_NO_ROUTE",
4: "FAILED_ERROR",
5: "FAILED_INCORRECT_PAYMENT_DETAILS",
6: "FAILED_INSUFFICIENT_BALANCE",
}
var PaymentState_value = map[string]int32{
@ -64,6 +68,7 @@ var PaymentState_value = map[string]int32{
"FAILED_NO_ROUTE": 3,
"FAILED_ERROR": 4,
"FAILED_INCORRECT_PAYMENT_DETAILS": 5,
"FAILED_INSUFFICIENT_BALANCE": 6,
}
func (x PaymentState) String() string {
@ -1505,135 +1510,136 @@ func init() {
func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
var fileDescriptor_7a0613f69d37b0a5 = []byte{
// 2038 bytes of a gzipped FileDescriptorProto
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}
// Reference imports to suppress errors if they are not otherwise used.

5
lnrpc/routerrpc/router.proto
View File

@ -142,6 +142,11 @@ enum PaymentState {
invalid final cltv delta)
*/
FAILED_INCORRECT_PAYMENT_DETAILS = 5;
/**
Insufficient local balance.
*/
FAILED_INSUFFICIENT_BALANCE = 6;
}

3
lnrpc/routerrpc/router_server.go
View File

@ -678,6 +678,9 @@ func marshallFailureReason(reason channeldb.FailureReason) (
case channeldb.FailureReasonPaymentDetails:
return PaymentState_FAILED_INCORRECT_PAYMENT_DETAILS, nil
case channeldb.FailureReasonInsufficientBalance:
return PaymentState_FAILED_INSUFFICIENT_BALANCE, nil
}
return 0, errors.New("unknown failure reason")

69
routing/pathfind.go
View File

@ -76,6 +76,10 @@ var (
// errMaxHopsExceeded is returned when a candidate path is found, but
// the length of that path exceeds HopLimit.
errMaxHopsExceeded = errors.New("potential path has too many hops")
// errInsufficientLocalBalance is returned when none of the local
// channels have enough balance for the payment.
errInsufficientBalance = errors.New("insufficient local balance")
)
// edgePolicyWithSource is a helper struct to keep track of the source node
@ -305,6 +309,50 @@ type PathFindingConfig struct {
MinProbability float64
}
// getMaxOutgoingAmt returns the maximum available balance in any of the
// channels of the given node.
func getMaxOutgoingAmt(node route.Vertex, outgoingChan *uint64,
g *graphParams, tx *bbolt.Tx) (lnwire.MilliSatoshi, error) {
var max lnwire.MilliSatoshi
cb := func(_ *bbolt.Tx, edgeInfo *channeldb.ChannelEdgeInfo, outEdge,
_ *channeldb.ChannelEdgePolicy) error {
if outEdge == nil {
return nil
}
chanID := outEdge.ChannelID
// Enforce outgoing channel restriction.
if outgoingChan != nil && chanID != *outgoingChan {
return nil
}
bandwidth, ok := g.bandwidthHints[chanID]
// If the bandwidth is not available for whatever reason, don't
// fail the pathfinding early.
if !ok {
max = lnwire.MaxMilliSatoshi
return nil
}
if bandwidth > max {
max = bandwidth
}
return nil
}
// Iterate over all channels of the to node.
err := g.graph.ForEachNodeChannel(tx, node[:], cb)
if err != nil {
return 0, err
}
return max, err
}
// findPath attempts to find a path from the source node within the
// ChannelGraph to the target node that's capable of supporting a payment of
// `amt` value. The current approach implemented is modified version of
@ -332,7 +380,13 @@ func findPath(g *graphParams, r *RestrictParams, cfg *PathFindingConfig,
"time=%v", nodesVisited, edgesExpanded, timeElapsed)
}()
var err error
// Get source node outside of the pathfinding tx, to prevent a deadlock.
selfNode, err := g.graph.SourceNode()
if err != nil {
return nil, err
}
self := selfNode.PubKeyBytes
tx := g.tx
if tx == nil {
tx, err = g.graph.Database().Begin(false)
@ -365,6 +419,18 @@ func findPath(g *graphParams, r *RestrictParams, cfg *PathFindingConfig,
}
}
// If we are routing from ourselves, check that we have enough local
// balance available.
if source == self {
max, err := getMaxOutgoingAmt(self, r.OutgoingChannelID, g, tx)
if err != nil {
return nil, err
}
if max < amt {
return nil, errInsufficientBalance
}
}
// First we'll initialize an empty heap which'll help us to quickly
// locate the next edge we should visit next during our graph
// traversal.
@ -375,7 +441,6 @@ func findPath(g *graphParams, r *RestrictParams, cfg *PathFindingConfig,
additionalEdgesWithSrc := make(map[route.Vertex][]*edgePolicyWithSource)
for vertex, outgoingEdgePolicies := range g.additionalEdges {
// Build reverse lookup to find incoming edges. Needed because
// search is taken place from target to source.
for _, outgoingEdgePolicy := range outgoingEdgePolicies {

31
routing/pathfind_test.go
View File

@ -2271,6 +2271,37 @@ func TestRouteToSelf(t *testing.T) {
ctx.assertPath(path, []uint64{1, 3, 2})
}
// TestInsufficientBalance tests that a dedicated error is returned for
// insufficient local balance.
func TestInsufficientBalance(t *testing.T) {
t.Parallel()
testChannels := []*testChannel{
symmetricTestChannel("source", "target", 100000, &testChannelPolicy{
Expiry: 144,
FeeBaseMsat: 500,
}, 1),
}
ctx := newPathFindingTestContext(t, testChannels, "source")
defer ctx.cleanup()
paymentAmt := lnwire.NewMSatFromSatoshis(100)
target := ctx.keyFromAlias("target")
ctx.graphParams.bandwidthHints = map[uint64]lnwire.MilliSatoshi{
1: lnwire.NewMSatFromSatoshis(50),
}
// Find the best path to self. We expect this to be source->a->source,
// because a charges the lowest forwarding fee.
_, err := ctx.findPath(target, paymentAmt)
if err != errInsufficientBalance {
t.Fatalf("expected insufficient balance error, but got: %v",
err)
}
}
type pathFindingTestContext struct {
t *testing.T
graphParams graphParams

3
routing/payment_lifecycle.go
View File

@ -194,6 +194,9 @@ func errorToPaymentFailure(err error) channeldb.FailureReason {
errPrebuiltRouteTried:
return channeldb.FailureReasonNoRoute
case errInsufficientBalance:
return channeldb.FailureReasonInsufficientBalance
}
return channeldb.FailureReasonError