Merge pull request #3556 from joostjager/query-mc-prob

routerrpc: add queryprob rpc

cmd/lncli/cmd_query_mission_control.go

@@ -48,9 +48,9 @@ func queryMissionControl(ctx *cli.Context) error {
 			displayPairHistory{
 				NodeFrom:              hex.EncodeToString(n.NodeFrom),
 				NodeTo:                hex.EncodeToString(n.NodeTo),
-				LastAttemptSuccessful: n.LastAttemptSuccessful,
+				LastAttemptSuccessful: n.History.LastAttemptSuccessful,
-				Timestamp:             n.Timestamp,
+				Timestamp:             n.History.Timestamp,
-				MinPenalizeAmtSat:     n.MinPenalizeAmtSat,
+				MinPenalizeAmtSat:     n.History.MinPenalizeAmtSat,
 			},
 		)
 	}

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

@@ -1050,16 +1050,11 @@ type PairHistory struct {
 	/// The source node pubkey of the pair.
 	NodeFrom []byte `protobuf:"bytes,1,opt,name=node_from,proto3" json:"node_from,omitempty"`
 	/// The destination node pubkey of the pair.
-	NodeTo []byte `protobuf:"bytes,2,opt,name=node_to,proto3" json:"node_to,omitempty"`
+	NodeTo               []byte    `protobuf:"bytes,2,opt,name=node_to,proto3" json:"node_to,omitempty"`
-	/// Time stamp of last result.
+	History              *PairData `protobuf:"bytes,7,opt,name=history,proto3" json:"history,omitempty"`
-	Timestamp int64 `protobuf:"varint,3,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	XXX_NoUnkeyedLiteral struct{}  `json:"-"`
-	/// Minimum penalization amount (only applies to failed attempts).
+	XXX_unrecognized     []byte    `json:"-"`
-	MinPenalizeAmtSat int64 `protobuf:"varint,4,opt,name=min_penalize_amt_sat,proto3" json:"min_penalize_amt_sat,omitempty"`
+	XXX_sizecache        int32     `json:"-"`
-	/// Whether the last payment attempt through this pair was successful.
-	LastAttemptSuccessful bool     `protobuf:"varint,6,opt,name=last_attempt_successful,proto3" json:"last_attempt_successful,omitempty"`
-	XXX_NoUnkeyedLiteral  struct{} `json:"-"`
-	XXX_unrecognized      []byte   `json:"-"`
-	XXX_sizecache         int32    `json:"-"`
 }
 
 func (m *PairHistory) Reset()         { *m = PairHistory{} }
@@ -1101,27 +1096,178 @@ func (m *PairHistory) GetNodeTo() []byte {
 	return nil
 }
 
-func (m *PairHistory) GetTimestamp() int64 {
+func (m *PairHistory) GetHistory() *PairData {
+	if m != nil {
+		return m.History
+	}
+	return nil
+}
+
+type PairData struct {
+	/// Time stamp of last result.
+	Timestamp int64 `protobuf:"varint,1,opt,name=timestamp,proto3" json:"timestamp,omitempty"`
+	/// Minimum penalization amount (only applies to failed attempts).
+	MinPenalizeAmtSat int64 `protobuf:"varint,2,opt,name=min_penalize_amt_sat,proto3" json:"min_penalize_amt_sat,omitempty"`
+	/// Whether the last payment attempt through this pair was successful.
+	LastAttemptSuccessful bool     `protobuf:"varint,3,opt,name=last_attempt_successful,proto3" json:"last_attempt_successful,omitempty"`
+	XXX_NoUnkeyedLiteral  struct{} `json:"-"`
+	XXX_unrecognized      []byte   `json:"-"`
+	XXX_sizecache         int32    `json:"-"`
+}
+
+func (m *PairData) Reset()         { *m = PairData{} }
+func (m *PairData) String() string { return proto.CompactTextString(m) }
+func (*PairData) ProtoMessage()    {}
+func (*PairData) Descriptor() ([]byte, []int) {
+	return fileDescriptor_7a0613f69d37b0a5, []int{14}
+}
+
+func (m *PairData) XXX_Unmarshal(b []byte) error {
+	return xxx_messageInfo_PairData.Unmarshal(m, b)
+}
+func (m *PairData) XXX_Marshal(b []byte, deterministic bool) ([]byte, error) {
+	return xxx_messageInfo_PairData.Marshal(b, m, deterministic)
+}
+func (m *PairData) XXX_Merge(src proto.Message) {
+	xxx_messageInfo_PairData.Merge(m, src)
+}
+func (m *PairData) XXX_Size() int {
+	return xxx_messageInfo_PairData.Size(m)
+}
+func (m *PairData) XXX_DiscardUnknown() {
+	xxx_messageInfo_PairData.DiscardUnknown(m)
+}
+
+var xxx_messageInfo_PairData proto.InternalMessageInfo
+
+func (m *PairData) GetTimestamp() int64 {
 	if m != nil {
 		return m.Timestamp
 	}
 	return 0
 }
 
-func (m *PairHistory) GetMinPenalizeAmtSat() int64 {
+func (m *PairData) GetMinPenalizeAmtSat() int64 {
 	if m != nil {
 		return m.MinPenalizeAmtSat
 	}
 	return 0
 }
 
-func (m *PairHistory) GetLastAttemptSuccessful() bool {
+func (m *PairData) GetLastAttemptSuccessful() bool {
 	if m != nil {
 		return m.LastAttemptSuccessful
 	}
 	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
@@ -1148,7 +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{14}
+	return fileDescriptor_7a0613f69d37b0a5, []int{17}
 }
 
 func (m *BuildRouteRequest) XXX_Unmarshal(b []byte) error {
@@ -1210,7 +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{15}
+	return fileDescriptor_7a0613f69d37b0a5, []int{18}
 }
 
 func (m *BuildRouteResponse) XXX_Unmarshal(b []byte) error {
@@ -1256,6 +1402,9 @@ func init() {
 	proto.RegisterType((*QueryMissionControlRequest)(nil), "routerrpc.QueryMissionControlRequest")
 	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")
 }
@@ -1263,120 +1412,128 @@ func init() {
 func init() { proto.RegisterFile("routerrpc/router.proto", fileDescriptor_7a0613f69d37b0a5) }
 
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-	0x03, 0x00, 0x00, 0xff, 0xff, 0x3e, 0x15, 0x37, 0x36, 0x88, 0x0f, 0x00, 0x00,
+	0x50, 0x5b, 0x5d, 0x31, 0x1e, 0x91, 0xef, 0x5d, 0x71, 0x79, 0x2e, 0xaf, 0x7e, 0xf6, 0x90, 0x38,
+	0xb6, 0x36, 0x82, 0xdd, 0x35, 0x1c, 0x8a, 0x7e, 0x95, 0xf6, 0xe0, 0x41, 0x06, 0xae, 0x7e, 0xf9,
+	0x4b, 0x6a, 0x8b, 0x53, 0xd6, 0x90, 0xed, 0xd2, 0x29, 0x0f, 0x53, 0xf5, 0xd2, 0x29, 0x1f, 0xe3,
+	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.
@@ -1418,6 +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.
@@ -1532,6 +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...)
@@ -1570,6 +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.
@@ -1694,6 +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 {
@@ -1732,6 +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

@@ -350,17 +350,40 @@ message PairHistory {
     
     /// The destination node pubkey of the pair.
     bytes node_to = 2 [json_name="node_to"];
-    
+
+    reserved 3, 4, 5, 6;
+
+    PairData history = 7 [json_name="history"];
+}
+
+message PairData {
     /// Time stamp of last result.
-    int64 timestamp = 3 [json_name = "timestamp"];
+    int64 timestamp = 1 [json_name = "timestamp"];
 
     /// Minimum penalization amount (only applies to failed attempts).
-    int64 min_penalize_amt_sat = 4 [json_name = "min_penalize_amt_sat"];
+    int64 min_penalize_amt_sat = 2 [json_name = "min_penalize_amt_sat"];
-
-    reserved 5;
 
     /// Whether the last payment attempt through this pair was successful.
-    bool last_attempt_successful = 6 [json_name = "last_attempt_successful"];
+    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 {
@@ -436,6 +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",
@@ -472,13 +476,9 @@ func (s *Server) QueryMissionControl(ctx context.Context,
 		pair := p
 
 		rpcPair := PairHistory{
-			NodeFrom:  pair.Pair.From[:],
+			NodeFrom: pair.Pair.From[:],
-			NodeTo:    pair.Pair.To[:],
+			NodeTo:   pair.Pair.To[:],
-			Timestamp: pair.Timestamp.Unix(),
+			History:  toRPCPairData(&pair.TimedPairResult),
-			MinPenalizeAmtSat: int64(
-				pair.MinPenalizeAmt.ToSatoshis(),
-			),
-			LastAttemptSuccessful: pair.LastAttemptSuccessful,
 		}
 
 		rpcPairs = append(rpcPairs, &rpcPair)
@@ -491,6 +491,49 @@ func (s *Server) QueryMissionControl(ctx context.Context,
 	return &response, nil
 }
 
+// toRPCPairData marshalls mission control pair data to the rpc struct.
+func toRPCPairData(data *routing.TimedPairResult) *PairData {
+	rpcData := PairData{
+		MinPenalizeAmtSat: int64(
+			data.MinPenalizeAmt.ToSatoshis(),
+		),
+		LastAttemptSuccessful: data.Success,
+	}
+
+	if !data.Timestamp.IsZero() {
+		rpcData.Timestamp = data.Timestamp.Unix()
+	}
+
+	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

@@ -53,7 +53,7 @@ const (
 )
 
 // NodeResults contains previous results from a node to its peers.
-type NodeResults map[route.Vertex]timedPairResult
+type NodeResults map[route.Vertex]TimedPairResult
 
 // MissionControl contains state which summarizes the past attempts of HTLC
 // routing by external callers when sending payments throughout the network. It
@@ -120,12 +120,29 @@ type MissionControlConfig struct {
 	AprioriWeight float64
 }
 
-// timedPairResult describes a timestamped pair result.
+// TimedPairResult describes a timestamped pair result.
-type timedPairResult struct {
+type TimedPairResult struct {
 	// timestamp is the time when this result was obtained.
-	timestamp time.Time
+	Timestamp time.Time
 
-	pairResult
+	// minPenalizeAmt is the minimum amount for which a penalty should be
+	// applied based on this result. Only applies to fail results.
+	MinPenalizeAmt lnwire.MilliSatoshi
+
+	// success indicates whether the payment attempt was successful through
+	// this pair.
+	Success bool
+}
+
+// newTimedPairResult wraps a pair result with a timestamp.
+func newTimedPairResult(timestamp time.Time,
+	result pairResult) TimedPairResult {
+
+	return TimedPairResult{
+		Timestamp:      timestamp,
+		MinPenalizeAmt: result.minPenalizeAmt,
+		Success:        result.success,
+	}
 }
 
 // MissionControlSnapshot contains a snapshot of the current state of mission
@@ -142,16 +159,8 @@ type MissionControlPairSnapshot struct {
 	// Pair is the node pair of which the state is described.
 	Pair DirectedNodePair
 
-	// Timestamp is the time of last result.
+	// TimedPairResult contains the data for this pair.
-	Timestamp time.Time
+	TimedPairResult
-
-	// MinPenalizeAmt is the minimum amount for which the channel will be
-	// penalized.
-	MinPenalizeAmt lnwire.MilliSatoshi
-
-	// LastAttemptSuccessful indicates whether the last payment attempt
-	// through this pair was successful.
-	LastAttemptSuccessful bool
 }
 
 // paymentResult is the information that becomes available when a payment
@@ -257,7 +266,7 @@ func (m *MissionControl) GetProbability(fromNode, toNode route.Vertex,
 
 // setLastPairResult stores a result for a node pair.
 func (m *MissionControl) setLastPairResult(fromNode,
-	toNode route.Vertex, result timedPairResult) {
+	toNode route.Vertex, result TimedPairResult) {
 
 	nodePairs, ok := m.lastPairResult[fromNode]
 	if !ok {
@@ -278,10 +287,9 @@ func (m *MissionControl) setAllFail(fromNode route.Vertex,
 	}
 
 	for connection := range nodePairs {
-		nodePairs[connection] = timedPairResult{
+		nodePairs[connection] = newTimedPairResult(
-			timestamp:  timestamp,
+			timestamp, failPairResult(0),
-			pairResult: failPairResult(0),
+		)
-		}
 	}
 }
 
@@ -329,14 +337,11 @@ func (m *MissionControl) GetHistorySnapshot() *MissionControlSnapshot {
 
 	for fromNode, fromPairs := range m.lastPairResult {
 		for toNode, result := range fromPairs {
-
 			pair := NewDirectedNodePair(fromNode, toNode)
 
 			pairSnapshot := MissionControlPairSnapshot{
-				Pair:                  pair,
+				Pair:            pair,
-				MinPenalizeAmt:        result.minPenalizeAmt,
+				TimedPairResult: result,
-				Timestamp:             result.timestamp,
-				LastAttemptSuccessful: result.success,
 			}
 
 			pairs = append(pairs, pairSnapshot)
@@ -350,6 +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
@@ -468,10 +493,13 @@ func (m *MissionControl) applyPaymentResult(
 				pair, pairResult.minPenalizeAmt)
 		}
 
-		m.setLastPairResult(pair.From, pair.To, timedPairResult{
+		m.setLastPairResult(
-			timestamp:  result.timeReply,
+			pair.From, pair.To,
-			pairResult: pairResult,
+			newTimedPairResult(
-		})
+				result.timeReply,
+				pairResult,
+			),
+		)
 	}
 
 	return i.finalFailureReason

routing/probability_estimator.go

@@ -80,19 +80,19 @@ func (p *probabilityEstimator) getNodeProbability(now time.Time,
 	totalWeight := aprioriFactor
 
 	for _, result := range results {
-		age := now.Sub(result.timestamp)
+		age := now.Sub(result.Timestamp)
 
 		switch {
 		// Weigh success with a constant high weight of 1. There is no
 		// decay.
-		case result.success:
+		case result.Success:
 			totalWeight++
 			probabilitiesTotal += p.prevSuccessProbability
 
 		// Weigh failures in accordance with their age. The base
 		// probability of a failure is considered zero, so nothing needs
 		// to be added to probabilitiesTotal.
-		case amt >= result.minPenalizeAmt:
+		case amt >= result.MinPenalizeAmt:
 			totalWeight += p.getWeight(age)
 		}
 	}
@@ -127,7 +127,7 @@ func (p *probabilityEstimator) getPairProbability(
 
 	// For successes, we have a fixed (high) probability. Those pairs
 	// will be assumed good until proven otherwise.
-	if lastPairResult.success {
+	if lastPairResult.Success {
 		return p.prevSuccessProbability
 	}
 
@@ -138,11 +138,11 @@ func (p *probabilityEstimator) getPairProbability(
 	// penalization. If the current amount is smaller than the amount that
 	// previously triggered a failure, we act as if this is an untried
 	// channel.
-	if amt < lastPairResult.minPenalizeAmt {
+	if amt < lastPairResult.MinPenalizeAmt {
 		return nodeProbability
 	}
 
-	timeSinceLastFailure := now.Sub(lastPairResult.timestamp)
+	timeSinceLastFailure := now.Sub(lastPairResult.Timestamp)
 
 	// Calculate success probability based on the weight of the last
 	// failure. When the failure is fresh, its weight is 1 and we'll return

routing/probability_estimator_test.go

@@ -33,7 +33,7 @@ type estimatorTestContext struct {
 	// corresponds to the last result towards a node. The list index equals
 	// the node id. So the first element in the list is the result towards
 	// node 0.
-	results map[int]timedPairResult
+	results map[int]TimedPairResult
 }
 
 func newEstimatorTestContext(t *testing.T) *estimatorTestContext {
@@ -83,11 +83,11 @@ func TestProbabilityEstimatorNoResults(t *testing.T) {
 func TestProbabilityEstimatorOneSuccess(t *testing.T) {
 	ctx := newEstimatorTestContext(t)
 
-	ctx.results = map[int]timedPairResult{
+	ctx.results = map[int]TimedPairResult{
-		node1: {
+		node1: newTimedPairResult(
-			timestamp:  testTime.Add(-time.Hour),
+			testTime.Add(-time.Hour),
-			pairResult: successPairResult(),
+			successPairResult(),
-		},
+		),
 	}
 
 	// Because of the previous success, this channel keep reporting a high
@@ -107,11 +107,11 @@ func TestProbabilityEstimatorOneSuccess(t *testing.T) {
 func TestProbabilityEstimatorOneFailure(t *testing.T) {
 	ctx := newEstimatorTestContext(t)
 
-	ctx.results = map[int]timedPairResult{
+	ctx.results = map[int]TimedPairResult{
-		node1: {
+		node1: newTimedPairResult(
-			timestamp:  testTime.Add(-time.Hour),
+			testTime.Add(-time.Hour),
-			pairResult: failPairResult(0),
+			failPairResult(0),
-		},
+		),
 	}
 
 	// For an untried node, we expected the node probability. The weight for
@@ -130,19 +130,19 @@ func TestProbabilityEstimatorOneFailure(t *testing.T) {
 func TestProbabilityEstimatorMix(t *testing.T) {
 	ctx := newEstimatorTestContext(t)
 
-	ctx.results = map[int]timedPairResult{
+	ctx.results = map[int]TimedPairResult{
-		node1: {
+		node1: newTimedPairResult(
-			timestamp:  testTime.Add(-time.Hour),
+			testTime.Add(-time.Hour),
-			pairResult: successPairResult(),
+			successPairResult(),
-		},
+		),
-		node2: {
+		node2: newTimedPairResult(
-			timestamp:  testTime.Add(-2 * time.Hour),
+			testTime.Add(-2*time.Hour),
-			pairResult: failPairResult(0),
+			failPairResult(0),
-		},
+		),
-		node3: {
+		node3: newTimedPairResult(
-			timestamp:  testTime.Add(-3 * time.Hour),
+			testTime.Add(-3*time.Hour),
-			pairResult: failPairResult(0),
+			failPairResult(0),
-		},
+		),
 	}
 
 	// We expect the probability for a previously successful channel to