routerrpc: add mc probability query rpc

Probabilities are no longer returned for querymc calls. To still provide
some insight into the mission control internals, this commit adds a new
rpc that calculates a success probability estimate for a specific node
pair and amount.

cmd/lncli/cmd_query_probability.go

@@ -0,0 +1,70 @@
+// +build routerrpc
+
+package main
+
+import (
+	"context"
+	"fmt"
+	"strconv"
+
+	"github.com/btcsuite/btcutil"
+	"github.com/lightningnetwork/lnd/lnrpc/routerrpc"
+	"github.com/lightningnetwork/lnd/lnwire"
+	"github.com/lightningnetwork/lnd/routing/route"
+	"github.com/urfave/cli"
+)
+
+var queryProbCommand = cli.Command{
+	Name:      "queryprob",
+	Category:  "Payments",
+	Usage:     "Estimate a success probability.",
+	ArgsUsage: "from-node to-node amt",
+	Action:    actionDecorator(queryProb),
+}
+
+func queryProb(ctx *cli.Context) error {
+	args := ctx.Args()
+
+	if len(args) != 3 {
+		return cli.ShowCommandHelp(ctx, "queryprob")
+	}
+
+	fromNode, err := route.NewVertexFromStr(args.Get(0))
+	if err != nil {
+		return fmt.Errorf("invalid from node key: %v", err)
+	}
+
+	toNode, err := route.NewVertexFromStr(args.Get(1))
+	if err != nil {
+		return fmt.Errorf("invalid to node key: %v", err)
+	}
+
+	amtSat, err := strconv.ParseUint(args.Get(2), 10, 64)
+	if err != nil {
+		return fmt.Errorf("invalid amt: %v", err)
+	}
+
+	amtMsat := lnwire.NewMSatFromSatoshis(
+		btcutil.Amount(amtSat),
+	)
+
+	conn := getClientConn(ctx, false)
+	defer conn.Close()
+
+	client := routerrpc.NewRouterClient(conn)
+
+	req := &routerrpc.QueryProbabilityRequest{
+		FromNode: fromNode[:],
+		ToNode:   toNode[:],
+		AmtMsat:  int64(amtMsat),
+	}
+	rpcCtx := context.Background()
+	response, err := client.QueryProbability(rpcCtx, req)
+	if err != nil {
+		return err
+	}
+
+	printJSON(response)
+
+	return nil
+}

cmd/lncli/routerrpc_active.go

@@ -8,6 +8,7 @@ import "github.com/urfave/cli"
 func routerCommands() []cli.Command {
 	return []cli.Command{
 		queryMissionControlCommand,
+		queryProbCommand,
 		resetMissionControlCommand,
 		buildRouteCommand,
 	}

lnrpc/routerrpc/router.pb.go

@@ -1161,6 +1161,113 @@ func (m *PairData) GetLastAttemptSuccessful() bool {
 	return false
 }
 
+type QueryProbabilityRequest struct {
+	/// The source node pubkey of the pair.
+	FromNode []byte `protobuf:"bytes,1,opt,name=from_node,proto3" json:"from_node,omitempty"`
+	/// The destination node pubkey of the pair.
+	ToNode []byte `protobuf:"bytes,2,opt,name=to_node,proto3" json:"to_node,omitempty"`
+	/// The amount for which to calculate a probability.
+	AmtMsat              int64    `protobuf:"varint,3,opt,name=amt_msat,proto3" json:"amt_msat,omitempty"`
+	XXX_NoUnkeyedLiteral struct{} `json:"-"`
+	XXX_unrecognized     []byte   `json:"-"`
+	XXX_sizecache        int32    `json:"-"`
+}
+
+func (m *QueryProbabilityRequest) Reset()         { *m = QueryProbabilityRequest{} }
+func (m *QueryProbabilityRequest) String() string { return proto.CompactTextString(m) }
+func (*QueryProbabilityRequest) ProtoMessage()    {}
+func (*QueryProbabilityRequest) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7a0613f69d37b0a5, []int{15}
+}
+
+func (m *QueryProbabilityRequest) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_QueryProbabilityRequest.Unmarshal(m, b)
+}
+func (m *QueryProbabilityRequest) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_QueryProbabilityRequest.Marshal(b, m, deterministic)
+}
+func (m *QueryProbabilityRequest) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_QueryProbabilityRequest.Merge(m, src)
+}
+func (m *QueryProbabilityRequest) XXX_Size() int {
+	return xxx_messageInfo_QueryProbabilityRequest.Size(m)
+}
+func (m *QueryProbabilityRequest) XXX_DiscardUnknown() {
+	xxx_messageInfo_QueryProbabilityRequest.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_QueryProbabilityRequest proto.InternalMessageInfo
+
+func (m *QueryProbabilityRequest) GetFromNode() []byte {
+	if m != nil {
+		return m.FromNode
+	}
+	return nil
+}
+
+func (m *QueryProbabilityRequest) GetToNode() []byte {
+	if m != nil {
+		return m.ToNode
+	}
+	return nil
+}
+
+func (m *QueryProbabilityRequest) GetAmtMsat() int64 {
+	if m != nil {
+		return m.AmtMsat
+	}
+	return 0
+}
+
+type QueryProbabilityResponse struct {
+	/// The success probability for the requested pair.
+	Probability float64 `protobuf:"fixed64,1,opt,name=probability,proto3" json:"probability,omitempty"`
+	/// The historical data for the requested pair.
+	History              *PairData `protobuf:"bytes,2,opt,name=history,proto3" json:"history,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
+	XXX_unrecognized     []byte    `json:"-"`
+	XXX_sizecache        int32     `json:"-"`
+}
+
+func (m *QueryProbabilityResponse) Reset()         { *m = QueryProbabilityResponse{} }
+func (m *QueryProbabilityResponse) String() string { return proto.CompactTextString(m) }
+func (*QueryProbabilityResponse) ProtoMessage()    {}
+func (*QueryProbabilityResponse) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7a0613f69d37b0a5, []int{16}
+}
+
+func (m *QueryProbabilityResponse) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_QueryProbabilityResponse.Unmarshal(m, b)
+}
+func (m *QueryProbabilityResponse) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_QueryProbabilityResponse.Marshal(b, m, deterministic)
+}
+func (m *QueryProbabilityResponse) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_QueryProbabilityResponse.Merge(m, src)
+}
+func (m *QueryProbabilityResponse) XXX_Size() int {
+	return xxx_messageInfo_QueryProbabilityResponse.Size(m)
+}
+func (m *QueryProbabilityResponse) XXX_DiscardUnknown() {
+	xxx_messageInfo_QueryProbabilityResponse.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_QueryProbabilityResponse proto.InternalMessageInfo
+
+func (m *QueryProbabilityResponse) GetProbability() float64 {
+	if m != nil {
+		return m.Probability
+	}
+	return 0
+}
+
+func (m *QueryProbabilityResponse) GetHistory() *PairData {
+	if m != nil {
+		return m.History
+	}
+	return nil
+}
+
 type BuildRouteRequest struct {
 	//*
 	//The amount to send expressed in msat. If set to zero, the minimum routable
@@ -1187,7 +1294,7 @@ func (m *BuildRouteRequest) Reset()         { *m = BuildRouteRequest{} }
 func (m *BuildRouteRequest) String() string { return proto.CompactTextString(m) }
 func (*BuildRouteRequest) ProtoMessage()    {}
 func (*BuildRouteRequest) Descriptor() ([]byte, []int) {
-	return fileDescriptor_7a0613f69d37b0a5, []int{15}
+	return fileDescriptor_7a0613f69d37b0a5, []int{17}
 }
 
 func (m *BuildRouteRequest) XXX_Unmarshal(b []byte) error {
@@ -1249,7 +1356,7 @@ func (m *BuildRouteResponse) Reset()         { *m = BuildRouteResponse{} }
 func (m *BuildRouteResponse) String() string { return proto.CompactTextString(m) }
 func (*BuildRouteResponse) ProtoMessage()    {}
 func (*BuildRouteResponse) Descriptor() ([]byte, []int) {
-	return fileDescriptor_7a0613f69d37b0a5, []int{16}
+	return fileDescriptor_7a0613f69d37b0a5, []int{18}
 }
 
 func (m *BuildRouteResponse) XXX_Unmarshal(b []byte) error {
@@ -1296,6 +1403,8 @@ func init() {
 	proto.RegisterType((*QueryMissionControlResponse)(nil), "routerrpc.QueryMissionControlResponse")
 	proto.RegisterType((*PairHistory)(nil), "routerrpc.PairHistory")
 	proto.RegisterType((*PairData)(nil), "routerrpc.PairData")
+	proto.RegisterType((*QueryProbabilityRequest)(nil), "routerrpc.QueryProbabilityRequest")
+	proto.RegisterType((*QueryProbabilityResponse)(nil), "routerrpc.QueryProbabilityResponse")
 	proto.RegisterType((*BuildRouteRequest)(nil), "routerrpc.BuildRouteRequest")
 	proto.RegisterType((*BuildRouteResponse)(nil), "routerrpc.BuildRouteResponse")
 }
@@ -1303,123 +1412,128 @@ func init() {
 func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
 
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+	0x78, 0x01, 0x88, 0x90, 0xf1, 0x40, 0xc9, 0xe2, 0x90, 0xc5, 0x4b, 0x31, 0x20, 0x08, 0xbf, 0x64,
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+	0xdd, 0x65, 0xa4, 0xd3, 0xf3, 0xb5, 0x79, 0x0b, 0xc6, 0xfd, 0xe3, 0xe2, 0x34, 0x1f, 0x43, 0x69,
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+	0xba, 0x80, 0xe5, 0x89, 0x1a, 0x4e, 0x43, 0xe9, 0x64, 0x6c, 0xfc, 0x72, 0x32, 0xcc, 0xbf, 0x6b,
-	0xd9, 0x5f, 0x0c, 0x28, 0xa7, 0x67, 0x44, 0x54, 0x81, 0xa2, 0x65, 0xd3, 0x4e, 0xd7, 0xfa, 0xe1,
+	0xb0, 0xf3, 0x6a, 0xe6, 0x7a, 0xa3, 0xa5, 0xe9, 0xe8, 0x71, 0xca, 0x3d, 0x15, 0x7c, 0x31, 0xc2,
-	0x6c, 0x60, 0x7e, 0x22, 0x97, 0xfd, 0x61, 0xab, 0x85, 0x71, 0x1b, 0xb7, 0x4d, 0x43, 0xea, 0x9c,
+	0xc9, 0x76, 0x58, 0xf7, 0x49, 0xb1, 0xb1, 0xf6, 0x93, 0x62, 0xdd, 0x70, 0x9f, 0x79, 0x70, 0xb8,
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+	0x7f, 0x02, 0xa5, 0x71, 0x30, 0x25, 0xd3, 0xd9, 0xd5, 0x2d, 0xbb, 0x8b, 0x8c, 0xec, 0x71, 0xe6,
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+	0xa4, 0x8c, 0x61, 0x1c, 0x4c, 0x2f, 0x15, 0x62, 0xbe, 0x04, 0x94, 0x76, 0x34, 0x0e, 0xc8, 0x7c,
-	0x94, 0xed, 0x18, 0xb9, 0xff, 0x9a, 0x26, 0x8f, 0x6d, 0xae, 0xf1, 0xcf, 0x2c, 0x6c, 0xaa, 0x03,
+	0x48, 0xd3, 0x1e, 0x1c, 0xd2, 0x9e, 0xfd, 0x55, 0x83, 0x72, 0x7a, 0xfe, 0x45, 0x15, 0x28, 0xda,
-	0x86, 0xe8, 0x0c, 0x4a, 0xa9, 0x41, 0x1c, 0x1d, 0x7e, 0x74, 0x40, 0xaf, 0x55, 0xd7, 0x0f, 0xbd,
+	0x0e, 0x69, 0xb5, 0xed, 0xef, 0xcf, 0xfb, 0xfa, 0x27, 0x62, 0xd9, 0x1b, 0x34, 0x1a, 0x96, 0xd5,
-	0xf3, 0xe8, 0x85, 0x81, 0xce, 0xa1, 0x9c, 0x1e, 0xb5, 0x51, 0x7a, 0x84, 0x5a, 0x33, 0x83, 0x7f,
+	0xb4, 0x9a, 0xba, 0x26, 0x38, 0x5c, 0xd0, 0xb1, 0xd5, 0x24, 0x7d, 0xbb, 0x63, 0x75, 0x07, 0xe2,
-	0x34, 0xd6, 0x6b, 0x30, 0x71, 0x24, 0xdc, 0xa9, 0x1c, 0x99, 0xe2, 0x21, 0x16, 0xd5, 0x52, 0xfc,
+	0x75, 0xdf, 0x85, 0xed, 0x18, 0x73, 0xba, 0x04, 0x77, 0x07, 0x7d, 0x4b, 0xcf, 0x20, 0x1d, 0xca,
-	0x3b, 0x93, 0x71, 0xed, 0x60, 0xad, 0x2d, 0xae, 0x50, 0x57, 0x7f, 0x62, 0x3c, 0x46, 0xde, 0xfb,
+	0x31, 0x68, 0x61, 0xdc, 0xc5, 0x7a, 0x56, 0x3c, 0x49, 0x31, 0x72, 0x7f, 0x52, 0x48, 0x06, 0x89,
-	0xc4, 0xd5, 0xd9, 0xb5, 0xf6, 0xd9, 0x43, 0xe6, 0x38, 0xda, 0x18, 0x76, 0xd7, 0xe8, 0x0c, 0xfa,
+	0x5c, 0xed, 0x9f, 0x39, 0xd8, 0x94, 0x0e, 0x86, 0xe8, 0x1c, 0x4a, 0xa9, 0x8f, 0x0c, 0x74, 0xf4,
-	0x45, 0xfa, 0x04, 0x0f, 0xaa, 0x54, 0xed, 0xab, 0xff, 0x45, 0x5b, 0xee, 0xb2, 0x46, 0x90, 0x56,
+	0xd1, 0x8f, 0x8f, 0xaa, 0xb1, 0x7e, 0xa0, 0x9f, 0x45, 0x2f, 0x34, 0x74, 0x01, 0xe5, 0xf4, 0x67,
-	0x76, 0x79, 0x58, 0xce, 0x56, 0x76, 0xf9, 0x98, 0xae, 0x59, 0x00, 0xcb, 0x8e, 0x46, 0x4f, 0x52,
+	0x04, 0x4a, 0x8f, 0x87, 0x6b, 0xbe, 0x2f, 0x3e, 0x6a, 0xeb, 0x35, 0xe8, 0x56, 0xc4, 0xdd, 0x89,
-	0x5e, 0xf7, 0x6e, 0x64, 0xed, 0xf0, 0x01, 0xab, 0x0e, 0xf5, 0xea, 0x97, 0xbf, 0x3d, 0xbd, 0x72,
+	0x18, 0x07, 0xe3, 0x01, 0x1d, 0x55, 0x53, 0xfa, 0x2b, 0x53, 0x7f, 0xf5, 0x60, 0xad, 0x2c, 0xce,
-	0xc5, 0x64, 0xfe, 0xfe, 0x64, 0x14, 0x4c, 0x4f, 0x3d, 0x39, 0x1b, 0xfa, 0xae, 0x7f, 0xe5, 0x73,
+	0x50, 0x5b, 0x5d, 0x31, 0x1e, 0x91, 0xef, 0x5d, 0x71, 0x79, 0x2e, 0xaf, 0x7e, 0xf6, 0x90, 0x38,
-	0xf1, 0xfb, 0x20, 0xbc, 0x3e, 0xf5, 0xfc, 0xf1, 0xa9, 0xba, 0x18, 0xa7, 0x8b, 0x28, 0xef, 0x37,
+	0xb6, 0x36, 0x82, 0xdd, 0x35, 0x1c, 0x8a, 0x7e, 0x95, 0xf6, 0xe0, 0x41, 0x06, 0xae, 0x7e, 0xf9,
-	0xd5, 0xbf, 0xe9, 0xbf, 0xfa, 0x6f, 0x00, 0x00, 0x00, 0xff, 0xff, 0x1e, 0x33, 0xcc, 0xf1, 0xd6,
+	0x4b, 0x6a, 0x8b, 0x53, 0xd6, 0x90, 0xed, 0xd2, 0x29, 0x0f, 0x53, 0xf5, 0xd2, 0x29, 0x1f, 0xe3,
-	0x0f, 0x00, 0x00,
+	0xec, 0x9f, 0x40, 0x5f, 0x6d, 0x74, 0x64, 0xae, 0xee, 0xbd, 0x4f, 0x3a, 0xd5, 0xa7, 0x1f, 0xd5,
+	0x89, 0x8d, 0xdb, 0x00, 0x8b, 0x76, 0x41, 0x87, 0xa9, 0x2d, 0xf7, 0xda, 0xbd, 0x7a, 0xf4, 0x80,
+	0x54, 0x99, 0x7a, 0xf5, 0xeb, 0xdf, 0x9f, 0xdd, 0xb8, 0x7c, 0x3c, 0xbb, 0x3a, 0x1d, 0x06, 0x93,
+	0x33, 0x4f, 0x0c, 0xd5, 0xbe, 0xeb, 0xdf, 0xf8, 0x8c, 0xff, 0x21, 0x08, 0x6f, 0xcf, 0x3c, 0x7f,
+	0x74, 0x26, 0xbb, 0xee, 0x6c, 0x6e, 0xe5, 0x6a, 0x53, 0xfe, 0x7f, 0xe3, 0x37, 0xff, 0x0b, 0x00,
+	0x00, 0xff, 0xff, 0x1d, 0x08, 0x9a, 0xb8, 0x0f, 0x11, 0x00, 0x00,
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -1461,6 +1575,10 @@ type RouterClient interface {
 	//It is a development feature.
 	QueryMissionControl(ctx context.Context, in *QueryMissionControlRequest, opts ...grpc.CallOption) (*QueryMissionControlResponse, error)
 	//*
+	//QueryProbability returns the current success probability estimate for a
+	//given node pair and amount.
+	QueryProbability(ctx context.Context, in *QueryProbabilityRequest, opts ...grpc.CallOption) (*QueryProbabilityResponse, error)
+	//*
 	//BuildRoute builds a fully specified route based on a list of hop public
 	//keys. It retrieves the relevant channel policies from the graph in order to
 	//calculate the correct fees and time locks.
@@ -1575,6 +1693,15 @@ func (c *routerClient) QueryMissionControl(ctx context.Context, in *QueryMission
 	return out, nil
 }
 
+func (c *routerClient) QueryProbability(ctx context.Context, in *QueryProbabilityRequest, opts ...grpc.CallOption) (*QueryProbabilityResponse, error) {
+	out := new(QueryProbabilityResponse)
+	err := c.cc.Invoke(ctx, "/routerrpc.Router/QueryProbability", in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 func (c *routerClient) BuildRoute(ctx context.Context, in *BuildRouteRequest, opts ...grpc.CallOption) (*BuildRouteResponse, error) {
 	out := new(BuildRouteResponse)
 	err := c.cc.Invoke(ctx, "/routerrpc.Router/BuildRoute", in, out, opts...)
@@ -1613,6 +1740,10 @@ type RouterServer interface {
 	//It is a development feature.
 	QueryMissionControl(context.Context, *QueryMissionControlRequest) (*QueryMissionControlResponse, error)
 	//*
+	//QueryProbability returns the current success probability estimate for a
+	//given node pair and amount.
+	QueryProbability(context.Context, *QueryProbabilityRequest) (*QueryProbabilityResponse, error)
+	//*
 	//BuildRoute builds a fully specified route based on a list of hop public
 	//keys. It retrieves the relevant channel policies from the graph in order to
 	//calculate the correct fees and time locks.
@@ -1737,6 +1868,24 @@ func _Router_QueryMissionControl_Handler(srv interface{}, ctx context.Context, d
 	return interceptor(ctx, in, info, handler)
 }
 
+func _Router_QueryProbability_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(QueryProbabilityRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RouterServer).QueryProbability(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: "/routerrpc.Router/QueryProbability",
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RouterServer).QueryProbability(ctx, req.(*QueryProbabilityRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 func _Router_BuildRoute_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
 	in := new(BuildRouteRequest)
 	if err := dec(in); err != nil {
@@ -1775,6 +1924,10 @@ var _Router_serviceDesc = grpc.ServiceDesc{
 			MethodName: "QueryMissionControl",
 			Handler:    _Router_QueryMissionControl_Handler,
 		},
+		{
+			MethodName: "QueryProbability",
+			Handler:    _Router_QueryProbability_Handler,
+		},
 		{
 			MethodName: "BuildRoute",
 			Handler:    _Router_BuildRoute_Handler,

lnrpc/routerrpc/router.proto

@@ -367,6 +367,25 @@ message PairData {
     bool last_attempt_successful = 3 [json_name = "last_attempt_successful"];
 }
 
+message QueryProbabilityRequest{
+    /// The source node pubkey of the pair.
+    bytes from_node = 1 [json_name = "from_node"];
+
+    /// The destination node pubkey of the pair.
+    bytes to_node = 2 [json_name = "to_node"];
+
+    /// The amount for which to calculate a probability.
+    int64 amt_msat = 3 [json_name = "amt_msat"];
+}
+
+message QueryProbabilityResponse{
+    /// The success probability for the requested pair.
+    double probability = 1 [json_name = "probability"];
+
+    /// The historical data for the requested pair.
+    PairData history = 2 [json_name = "history"];
+}
+
 message BuildRouteRequest {
     /**
     The amount to send expressed in msat. If set to zero, the minimum routable
@@ -440,6 +459,12 @@ service Router {
     */
     rpc QueryMissionControl(QueryMissionControlRequest) returns (QueryMissionControlResponse);
 
+    /**
+    QueryProbability returns the current success probability estimate for a
+    given node pair and amount.
+    */
+    rpc QueryProbability(QueryProbabilityRequest) returns (QueryProbabilityResponse);
+
     /**
     BuildRoute builds a fully specified route based on a list of hop public
     keys. It retrieves the relevant channel policies from the graph in order to

lnrpc/routerrpc/router_backend.go

@@ -76,6 +76,11 @@ type MissionControl interface {
 	// GetHistorySnapshot takes a snapshot from the current mission control
 	// state and actual probability estimates.
 	GetHistorySnapshot() *routing.MissionControlSnapshot
+
+	// GetPairHistorySnapshot returns the stored history for a given node
+	// pair.
+	GetPairHistorySnapshot(fromNode,
+		toNode route.Vertex) routing.TimedPairResult
 }
 
 // QueryRoutes attempts to query the daemons' Channel Router for a possible

lnrpc/routerrpc/router_backend_test.go

@@ -174,3 +174,9 @@ func (m *mockMissionControl) ResetHistory() error {
 func (m *mockMissionControl) GetHistorySnapshot() *routing.MissionControlSnapshot {
 	return nil
 }
+
+func (m *mockMissionControl) GetPairHistorySnapshot(fromNode,
+	toNode route.Vertex) routing.TimedPairResult {
+
+	return routing.TimedPairResult{}
+}

lnrpc/routerrpc/router_server.go

@@ -68,6 +68,10 @@ var (
 			Entity: "offchain",
 			Action: "read",
 		}},
+		"/routerrpc.Router/QueryProbability": {{
+			Entity: "offchain",
+			Action: "read",
+		}},
 		"/routerrpc.Router/ResetMissionControl": {{
 			Entity: "offchain",
 			Action: "write",
@@ -503,6 +507,33 @@ func toRPCPairData(data *routing.TimedPairResult) *PairData {
 	return &rpcData
 }
 
+// QueryProbability returns the current success probability estimate for a
+// given node pair and amount.
+func (s *Server) QueryProbability(ctx context.Context,
+	req *QueryProbabilityRequest) (*QueryProbabilityResponse, error) {
+
+	fromNode, err := route.NewVertexFromBytes(req.FromNode)
+	if err != nil {
+		return nil, err
+	}
+
+	toNode, err := route.NewVertexFromBytes(req.ToNode)
+	if err != nil {
+		return nil, err
+	}
+
+	amt := lnwire.MilliSatoshi(req.AmtMsat)
+
+	mc := s.cfg.RouterBackend.MissionControl
+	prob := mc.GetProbability(fromNode, toNode, amt)
+	history := mc.GetPairHistorySnapshot(fromNode, toNode)
+
+	return &QueryProbabilityResponse{
+		Probability: prob,
+		History:     toRPCPairData(&history),
+	}, nil
+}
+
 // TrackPayment returns a stream of payment state updates. The stream is
 // closed when the payment completes.
 func (s *Server) TrackPayment(request *TrackPaymentRequest,

routing/missioncontrol.go

@@ -355,6 +355,26 @@ func (m *MissionControl) GetHistorySnapshot() *MissionControlSnapshot {
 	return &snapshot
 }
 
+// GetPairHistorySnapshot returns the stored history for a given node pair.
+func (m *MissionControl) GetPairHistorySnapshot(
+	fromNode, toNode route.Vertex) TimedPairResult {
+
+	m.Lock()
+	defer m.Unlock()
+
+	results, ok := m.lastPairResult[fromNode]
+	if !ok {
+		return TimedPairResult{}
+	}
+
+	result, ok := results[toNode]
+	if !ok {
+		return TimedPairResult{}
+	}
+
+	return result
+}
+
 // ReportPaymentFail reports a failed payment to mission control as input for
 // future probability estimates. The failureSourceIdx argument indicates the
 // failure source. If it is nil, the failure source is unknown. This function