diff --git a/channeldb/payments.go b/channeldb/payments.go index 7a541543..ca9cf42f 100644 --- a/channeldb/payments.go +++ b/channeldb/payments.go @@ -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" diff --git a/lnrpc/routerrpc/router.pb.go b/lnrpc/routerrpc/router.pb.go index c7223120..c6485311 100644 --- a/lnrpc/routerrpc/router.pb.go +++ b/lnrpc/routerrpc/router.pb.go @@ -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 - 0x1f, 0x8b, 0x08, 0x00, 0x00, 0x00, 0x00, 0x00, 0x02, 0xff, 0x8c, 0x58, 0x51, 0x73, 0x1a, 0xc9, - 0x11, 0xbe, 0x15, 0x20, 0x50, 0x03, 0x62, 0x35, 0xd2, 0xc9, 0x6b, 0x64, 0x9d, 0x75, 0x6b, 0xc7, - 0x47, 0xb9, 0x7c, 0x92, 0xa3, 0xd4, 0x5d, 0xb9, 0xee, 0x21, 0x29, 0x0c, 0xcb, 0x69, 0x65, 0x58, - 0xe4, 0x01, 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0xda, 0x62, 0xd4, 0x9f, + 0xdf, 0xdb, 0xe2, 0xea, 0xa3, 0xa0, 0xf6, 0xd9, 0x43, 0xe2, 0xc8, 0xda, 0x18, 0x76, 0x37, 0x10, + 0x38, 0xfa, 0x4d, 0x72, 0x05, 0x0f, 0xd2, 0x7f, 0xed, 0xd9, 0xaf, 0xa9, 0x2d, 0xbd, 0x6c, 0x60, + 0xfa, 0x15, 0x2f, 0x0f, 0xd7, 0x89, 0x15, 0x2f, 0x1f, 0x2b, 0x18, 0x3f, 0x81, 0xbe, 0xce, 0x04, + 0xc8, 0x58, 0x9f, 0x7b, 0x9f, 0x95, 0x6a, 0x5f, 0x7e, 0x54, 0x27, 0x32, 0x6e, 0x01, 0x2c, 0xef, + 0x13, 0x7a, 0x92, 0x98, 0x72, 0x8f, 0x0f, 0x6a, 0x87, 0x0f, 0x48, 0x95, 0xa9, 0xb3, 0xdf, 0xfe, + 0xf1, 0xe4, 0xc6, 0xe1, 0x93, 0xf9, 0xd5, 0xf1, 0xc8, 0x9f, 0x9e, 0xb8, 0xa2, 0xa3, 0xf7, 0x1c, + 0xef, 0xc6, 0x63, 0xfc, 0x17, 0x3f, 0xb8, 0x3d, 0x71, 0xbd, 0xf1, 0x89, 0xbc, 0x96, 0x27, 0x0b, + 0x2b, 0x57, 0x59, 0xf9, 0xf7, 0xd0, 0xef, 0xfe, 0x17, 0x00, 0x00, 0xff, 0xff, 0xbc, 0x2d, 0x5b, + 0xa8, 0x4e, 0x12, 0x00, 0x00, } // Reference imports to suppress errors if they are not otherwise used. diff --git a/lnrpc/routerrpc/router.proto b/lnrpc/routerrpc/router.proto index 7cd9a529..8911257e 100644 --- a/lnrpc/routerrpc/router.proto +++ b/lnrpc/routerrpc/router.proto @@ -142,6 +142,11 @@ enum PaymentState { invalid final cltv delta) */ FAILED_INCORRECT_PAYMENT_DETAILS = 5; + + /** + Insufficient local balance. + */ + FAILED_INSUFFICIENT_BALANCE = 6; } diff --git a/lnrpc/routerrpc/router_server.go b/lnrpc/routerrpc/router_server.go index e815e78a..c872afe3 100644 --- a/lnrpc/routerrpc/router_server.go +++ b/lnrpc/routerrpc/router_server.go @@ -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") diff --git a/routing/pathfind.go b/routing/pathfind.go index 83014a47..e794f814 100644 --- a/routing/pathfind.go +++ b/routing/pathfind.go @@ -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 { diff --git a/routing/pathfind_test.go b/routing/pathfind_test.go index dcbf352d..b52ad92e 100644 --- a/routing/pathfind_test.go +++ b/routing/pathfind_test.go @@ -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 diff --git a/routing/payment_lifecycle.go b/routing/payment_lifecycle.go index 3fb391eb..a15f88c9 100644 --- a/routing/payment_lifecycle.go +++ b/routing/payment_lifecycle.go @@ -194,6 +194,9 @@ func errorToPaymentFailure(err error) channeldb.FailureReason { errPrebuiltRouteTried: return channeldb.FailureReasonNoRoute + + case errInsufficientBalance: + return channeldb.FailureReasonInsufficientBalance } return channeldb.FailureReasonError