Routing service (#36)

2026-01-11 19:04:35 +00:00 · 2021-01-08 16:20:28 +00:00
parent 39e0f94152
commit f8eb3bfd9b
10 changed files with 836 additions and 0 deletions
--- a/routing/.gitignore
+++ b/routing/.gitignore
@@ -0,0 +1,2 @@
+
+routing
--- a/routing/Dockerfile
+++ b/routing/Dockerfile
@@ -0,0 +1,3 @@
+FROM alpine
+ADD routing /routing
+ENTRYPOINT [ "/routing" ]
--- a/routing/Makefile
+++ b/routing/Makefile
@@ -0,0 +1,22 @@
+
+GOPATH:=$(shell go env GOPATH)
+.PHONY: init
+init:
+	go get -u github.com/golang/protobuf/proto
+	go get -u github.com/golang/protobuf/protoc-gen-go
+	go get github.com/micro/micro/v3/cmd/protoc-gen-micro
+.PHONY: proto
+proto:
+	protoc --proto_path=. --micro_out=. --go_out=:. proto/routing.proto
+	
+.PHONY: build
+build:
+	go build -o routing *.go
+
+.PHONY: test
+test:
+	go test -v ./... -cover
+
+.PHONY: docker
+docker:
+	docker build . -t routing:latest
--- a/routing/generate.go
+++ b/routing/generate.go
@@ -0,0 +1,2 @@
+package main
+//go:generate make proto
--- a/routing/handler/handler.go
+++ b/routing/handler/handler.go
@@ -0,0 +1,85 @@
+package handler
+
+import (
+	"context"
+	"fmt"
+
+	"google.golang.org/protobuf/types/known/wrapperspb"
+	"googlemaps.github.io/maps"
+
+	"github.com/micro/micro/v3/service/errors"
+	"github.com/micro/micro/v3/service/logger"
+	pb "github.com/micro/services/routing/proto"
+)
+
+var (
+	ErrDownstream         = errors.InternalServerError("ROUTING_ERROR", "Unable to connect to routing provider")
+	ErrMissingOrigin      = errors.BadRequest("MISSING_ORIGIN", "Missing origin")
+	ErrMissingDestination = errors.BadRequest("MISSING_DESTINATION", "Missing destination")
+	ErrMissingLatitude    = errors.BadRequest("MISSING_LATITUDE", "Missing latitude")
+	ErrMissingLongitude   = errors.BadRequest("MISSING_LONGITUDE", "Missing longitude")
+	ErrNoRoutes           = errors.BadRequest("NO_ROUTES", "No routes found")
+)
+
+type Routing struct {
+	Maps *maps.Client
+}
+
+func (r *Routing) Route(ctx context.Context, req *pb.RouteRequest, rsp *pb.RouteResponse) error {
+	// validate the request
+	if req.Origin == nil {
+		return ErrMissingOrigin
+	}
+	if req.Destination == nil {
+		return ErrMissingDestination
+	}
+	if err := validatePoint(req.Origin); err != nil {
+		return err
+	}
+	if err := validatePoint(req.Destination); err != nil {
+		return err
+	}
+
+	// query google maps
+	routes, _, err := r.Maps.Directions(ctx, &maps.DirectionsRequest{
+		Origin: pointToString(req.Origin), Destination: pointToString(req.Destination),
+	})
+	if err != nil {
+		logger.Errorf("Error geocoding: %v. Origin: '%v', Destination: '%v'", err, pointToString(req.Origin), pointToString(req.Destination))
+		return ErrDownstream
+	}
+	if len(routes) == 0 {
+		return ErrNoRoutes
+	}
+
+	// decode the points
+	points, err := routes[0].OverviewPolyline.Decode()
+	if err != nil {
+		logger.Errorf("Error decoding polyline: %v", err)
+		return ErrDownstream
+	}
+
+	// return the result
+	rsp.Waypoints = make([]*pb.Point, len(points))
+	for i, p := range points {
+		rsp.Waypoints[i] = &pb.Point{
+			Latitude:  &wrapperspb.DoubleValue{Value: p.Lat},
+			Longitude: &wrapperspb.DoubleValue{Value: p.Lng},
+		}
+	}
+	return nil
+}
+
+func validatePoint(p *pb.Point) error {
+	if p.Latitude == nil {
+		return ErrMissingLatitude
+	}
+	if p.Longitude == nil {
+		return ErrMissingLongitude
+	}
+	return nil
+}
+
+func pointToString(p *pb.Point) string {
+	return fmt.Sprintf("%v,%v", p.Latitude.Value, p.Longitude.Value)
+}
--- a/routing/handler/handler_test.go
+++ b/routing/handler/handler_test.go
@@ -0,0 +1,251 @@
+package handler_test
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/http/httptest"
+	"strings"
+	"testing"
+
+	"github.com/micro/services/routing/handler"
+	pb "github.com/micro/services/routing/proto"
+	"github.com/stretchr/testify/assert"
+	"google.golang.org/protobuf/types/known/wrapperspb"
+	"googlemaps.github.io/maps"
+)
+
+const response = `{
+		"routes" : [
+			 {
+					"bounds" : {
+						 "northeast" : {
+								"lat" : -33.8150985,
+								"lng" : 151.2070825
+						 },
+						 "southwest" : {
+								"lat" : -33.8770049,
+								"lng" : 151.0031658
+						 }
+					},
+					"overview_polyline": {
+						"points" : "xvumEgs{y[V@|AH|@DdABbC@@?^@N?zD@\\?F@"
+					},
+					"copyrights" : "Map data ©2015 Google",
+					"legs" : [
+						 {
+								"distance" : {
+									 "text" : "23.8 km",
+									 "value" : 23846
+								},
+								"duration" : {
+									 "text" : "37 mins",
+									 "value" : 2214
+								},
+								"end_address" : "Parramatta NSW, Australia",
+								"end_location" : {
+									 "lat" : -33.8150985,
+									 "lng" : 151.0031658
+								},
+								"start_address" : "Sydney NSW, Australia",
+								"start_location" : {
+									 "lat" : -33.8674944,
+									 "lng" : 151.2070825
+								},
+								"steps" : [
+									 {
+											"distance" : {
+												 "text" : "0.4 km",
+												 "value" : 366
+											},
+											"duration" : {
+												 "text" : "2 mins",
+												 "value" : 103
+											},
+											"end_location" : {
+												 "lat" : -33.8707786,
+												 "lng" : 151.206934
+											},
+											"html_instructions" : "Head \u003cb\u003esouth\u003c/b\u003e on \u003cb\u003eGeorge St\u003c/b\u003e toward \u003cb\u003eBarrack St\u003c/b\u003e",
+											"polyline" : {
+												 "points" : "xvumEgs{y[V@|AH|@DdABbC@@?^@N?zD@\\?F@"
+											},
+											"start_location" : {
+												 "lat" : -33.8674944,
+												 "lng" : 151.2070825
+											},
+											"transit_details" : {
+												 "trip_short_name": "7108"
+											},
+											"travel_mode" : "DRIVING"
+									 }
+								],
+								"via_waypoint" : []
+						 }
+					],
+					"summary" : "A4 and M4"
+			 }
+		],
+		"status" : "OK"
+ }`
+
+func TestRoute(t *testing.T) {
+	var oLat, oLng, dLat, dLng string
+	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if comps := strings.Split(r.URL.Query().Get("origin"), ","); len(comps) == 2 {
+			oLat = comps[0]
+			oLng = comps[1]
+		} else {
+			oLat = ""
+		}
+
+		if comps := strings.Split(r.URL.Query().Get("destination"), ","); len(comps) == 2 {
+			dLat = comps[0]
+			dLng = comps[1]
+		} else {
+			dLat = ""
+		}
+
+		w.Header().Set("Content-Type", "application/json; charset=UTF-8")
+		w.WriteHeader(http.StatusOK)
+		fmt.Fprintln(w, response)
+	}))
+	defer server.Close()
+
+	m, err := maps.NewClient(maps.WithBaseURL(server.URL), maps.WithAPIKey("shh"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	h := &handler.Routing{Maps: m}
+
+	originLat := &wrapperspb.DoubleValue{Value: 33.8688}
+	originLng := &wrapperspb.DoubleValue{Value: 151.2093}
+
+	destinationLat := &wrapperspb.DoubleValue{Value: 33.8136}
+	destinationLng := &wrapperspb.DoubleValue{Value: 151.0034}
+
+	tt := []struct {
+		Name        string
+		Origin      *pb.Point
+		Destination *pb.Point
+		Error       error
+		Result      []*pb.Point
+	}{
+		{
+			Name:        "MissingOrigin",
+			Destination: &pb.Point{Latitude: destinationLat, Longitude: destinationLng},
+			Error:       handler.ErrMissingOrigin,
+		},
+		{
+			Name:   "MissingDestination",
+			Origin: &pb.Point{Latitude: originLat, Longitude: originLng},
+			Error:  handler.ErrMissingDestination,
+		},
+		{
+			Name:        "MissingLatitude",
+			Origin:      &pb.Point{Longitude: originLng},
+			Destination: &pb.Point{Latitude: destinationLat, Longitude: destinationLng},
+			Error:       handler.ErrMissingLatitude,
+		},
+		{
+			Name:        "MissingLongitude",
+			Origin:      &pb.Point{Latitude: originLat},
+			Destination: &pb.Point{Latitude: destinationLat, Longitude: destinationLng},
+			Error:       handler.ErrMissingLongitude,
+		},
+		{
+			Name:        "Valid",
+			Origin:      &pb.Point{Latitude: originLat, Longitude: originLng},
+			Destination: &pb.Point{Latitude: destinationLat, Longitude: destinationLng},
+			Result: []*pb.Point{
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.867490000000004},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20708000000002},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.867610000000006},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20707000000002},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.868080000000006},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20702},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.868390000000005},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20699000000002},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.86874},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20697},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.869400000000006},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20696},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.86941},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20696},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.86957},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20695},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.86965},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20695},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.87059},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20694},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.870740000000005},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20694},
+				},
+				{
+					Latitude:  &wrapperspb.DoubleValue{Value: -33.87078},
+					Longitude: &wrapperspb.DoubleValue{Value: 151.20693},
+				},
+			},
+		},
+	}
+
+	for _, tc := range tt {
+		t.Run(tc.Name, func(t *testing.T) {
+			var rsp pb.RouteResponse
+			err := h.Route(context.Background(), &pb.RouteRequest{
+				Origin: tc.Origin, Destination: tc.Destination,
+			}, &rsp)
+
+			assert.Equal(t, tc.Error, err)
+			if err != nil {
+				return
+			}
+
+			// check the right info was sent to google maps
+			if tc.Origin != nil && tc.Origin.Latitude != nil {
+				assert.Equal(t, fmt.Sprintf("%v", tc.Origin.Latitude.Value), oLat)
+			}
+			if tc.Origin != nil && tc.Origin.Longitude != nil {
+				assert.Equal(t, fmt.Sprintf("%v", tc.Origin.Longitude.Value), oLng)
+			}
+			if tc.Destination != nil && tc.Destination.Latitude != nil {
+				assert.Equal(t, fmt.Sprintf("%v", tc.Destination.Latitude.Value), dLat)
+			}
+			if tc.Destination != nil && tc.Destination.Longitude != nil {
+				assert.Equal(t, fmt.Sprintf("%v", tc.Destination.Longitude.Value), dLng)
+			}
+
+			// check the response is correct
+			if len(tc.Result) != len(rsp.Waypoints) {
+				t.Errorf("Incorrect number of waypoints returned, expected %v got %v", len(tc.Result), len(rsp.Waypoints))
+			}
+			for i, p := range tc.Result {
+				w := rsp.Waypoints[i]
+				assert.Equal(t, p.Latitude.Value, w.Latitude.Value)
+				assert.Equal(t, p.Longitude.Value, w.Longitude.Value)
+			}
+		})
+	}
+
+}
--- a/routing/main.go
+++ b/routing/main.go
@@ -0,0 +1,41 @@
+package main
+
+import (
+	"github.com/micro/services/routing/handler"
+	pb "github.com/micro/services/routing/proto"
+
+	"github.com/micro/micro/v3/service"
+	"github.com/micro/micro/v3/service/config"
+	"github.com/micro/micro/v3/service/logger"
+	"googlemaps.github.io/maps"
+)
+
+func main() {
+	// Create service
+	srv := service.New(
+		service.Name("routing"),
+		service.Version("latest"),
+	)
+
+	// Setup google maps
+	c, err := config.Get("google.apikey")
+	if err != nil {
+		logger.Fatalf("Error loading config: %v", err)
+	}
+	apiKey := c.String("")
+	if len(apiKey) == 0 {
+		logger.Fatalf("Missing required config: google.apikey")
+	}
+	m, err := maps.NewClient(maps.WithAPIKey(apiKey))
+	if err != nil {
+		logger.Fatalf("Error configuring google maps client: %v", err)
+	}
+
+	// Register handler
+	pb.RegisterRoutingHandler(srv.Server(), &handler.Routing{m})
+
+	// Run service
+	if err := srv.Run(); err != nil {
+		logger.Fatal(err)
+	}
+}
--- a/routing/proto/routing.pb.go
+++ b/routing/proto/routing.pb.go
@@ -0,0 +1,314 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.23.0
+// 	protoc        v3.13.0
+// source: proto/routing.proto
+
+package routing
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	wrappers "github.com/golang/protobuf/ptypes/wrappers"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type Point struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Latitude  *wrappers.DoubleValue `protobuf:"bytes,1,opt,name=latitude,proto3" json:"latitude,omitempty"`
+	Longitude *wrappers.DoubleValue `protobuf:"bytes,2,opt,name=longitude,proto3" json:"longitude,omitempty"`
+}
+
+func (x *Point) Reset() {
+	*x = Point{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_routing_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Point) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Point) ProtoMessage() {}
+
+func (x *Point) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_routing_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Point.ProtoReflect.Descriptor instead.
+func (*Point) Descriptor() ([]byte, []int) {
+	return file_proto_routing_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Point) GetLatitude() *wrappers.DoubleValue {
+	if x != nil {
+		return x.Latitude
+	}
+	return nil
+}
+
+func (x *Point) GetLongitude() *wrappers.DoubleValue {
+	if x != nil {
+		return x.Longitude
+	}
+	return nil
+}
+
+type RouteRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Origin      *Point `protobuf:"bytes,1,opt,name=origin,proto3" json:"origin,omitempty"`
+	Destination *Point `protobuf:"bytes,2,opt,name=destination,proto3" json:"destination,omitempty"`
+}
+
+func (x *RouteRequest) Reset() {
+	*x = RouteRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_routing_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RouteRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RouteRequest) ProtoMessage() {}
+
+func (x *RouteRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_routing_proto_msgTypes[1]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RouteRequest.ProtoReflect.Descriptor instead.
+func (*RouteRequest) Descriptor() ([]byte, []int) {
+	return file_proto_routing_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *RouteRequest) GetOrigin() *Point {
+	if x != nil {
+		return x.Origin
+	}
+	return nil
+}
+
+func (x *RouteRequest) GetDestination() *Point {
+	if x != nil {
+		return x.Destination
+	}
+	return nil
+}
+
+type RouteResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Waypoints []*Point `protobuf:"bytes,1,rep,name=waypoints,proto3" json:"waypoints,omitempty"`
+}
+
+func (x *RouteResponse) Reset() {
+	*x = RouteResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_proto_routing_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RouteResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RouteResponse) ProtoMessage() {}
+
+func (x *RouteResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_proto_routing_proto_msgTypes[2]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RouteResponse.ProtoReflect.Descriptor instead.
+func (*RouteResponse) Descriptor() ([]byte, []int) {
+	return file_proto_routing_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *RouteResponse) GetWaypoints() []*Point {
+	if x != nil {
+		return x.Waypoints
+	}
+	return nil
+}
+
+var File_proto_routing_proto protoreflect.FileDescriptor
+
+var file_proto_routing_proto_rawDesc = []byte{
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+	0x74, 0x6f, 0x33,
+}
+
+var (
+	file_proto_routing_proto_rawDescOnce sync.Once
+	file_proto_routing_proto_rawDescData = file_proto_routing_proto_rawDesc
+)
+
+func file_proto_routing_proto_rawDescGZIP() []byte {
+	file_proto_routing_proto_rawDescOnce.Do(func() {
+		file_proto_routing_proto_rawDescData = protoimpl.X.CompressGZIP(file_proto_routing_proto_rawDescData)
+	})
+	return file_proto_routing_proto_rawDescData
+}
+
+var file_proto_routing_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_proto_routing_proto_goTypes = []interface{}{
+	(*Point)(nil),                // 0: routing.Point
+	(*RouteRequest)(nil),         // 1: routing.RouteRequest
+	(*RouteResponse)(nil),        // 2: routing.RouteResponse
+	(*wrappers.DoubleValue)(nil), // 3: google.protobuf.DoubleValue
+}
+var file_proto_routing_proto_depIdxs = []int32{
+	3, // 0: routing.Point.latitude:type_name -> google.protobuf.DoubleValue
+	3, // 1: routing.Point.longitude:type_name -> google.protobuf.DoubleValue
+	0, // 2: routing.RouteRequest.origin:type_name -> routing.Point
+	0, // 3: routing.RouteRequest.destination:type_name -> routing.Point
+	0, // 4: routing.RouteResponse.waypoints:type_name -> routing.Point
+	1, // 5: routing.Routing.Route:input_type -> routing.RouteRequest
+	2, // 6: routing.Routing.Route:output_type -> routing.RouteResponse
+	6, // [6:7] is the sub-list for method output_type
+	5, // [5:6] is the sub-list for method input_type
+	5, // [5:5] is the sub-list for extension type_name
+	5, // [5:5] is the sub-list for extension extendee
+	0, // [0:5] is the sub-list for field type_name
+}
+
+func init() { file_proto_routing_proto_init() }
+func file_proto_routing_proto_init() {
+	if File_proto_routing_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_proto_routing_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Point); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_routing_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RouteRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_proto_routing_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*RouteResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_proto_routing_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   3,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_proto_routing_proto_goTypes,
+		DependencyIndexes: file_proto_routing_proto_depIdxs,
+		MessageInfos:      file_proto_routing_proto_msgTypes,
+	}.Build()
+	File_proto_routing_proto = out.File
+	file_proto_routing_proto_rawDesc = nil
+	file_proto_routing_proto_goTypes = nil
+	file_proto_routing_proto_depIdxs = nil
+}
--- a/routing/proto/routing.pb.micro.go
+++ b/routing/proto/routing.pb.micro.go
@@ -0,0 +1,94 @@
+// Code generated by protoc-gen-micro. DO NOT EDIT.
+// source: proto/routing.proto
+
+package routing
+
+import (
+	fmt "fmt"
+	proto "github.com/golang/protobuf/proto"
+	_ "github.com/golang/protobuf/ptypes/wrappers"
+	math "math"
+)
+
+import (
+	context "context"
+	api "github.com/micro/micro/v3/service/api"
+	client "github.com/micro/micro/v3/service/client"
+	server "github.com/micro/micro/v3/service/server"
+)
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ = proto.Marshal
+var _ = fmt.Errorf
+var _ = math.Inf
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the proto package it is being compiled against.
+// A compilation error at this line likely means your copy of the
+// proto package needs to be updated.
+const _ = proto.ProtoPackageIsVersion3 // please upgrade the proto package
+
+// Reference imports to suppress errors if they are not otherwise used.
+var _ api.Endpoint
+var _ context.Context
+var _ client.Option
+var _ server.Option
+
+// Api Endpoints for Routing service
+
+func NewRoutingEndpoints() []*api.Endpoint {
+	return []*api.Endpoint{}
+}
+
+// Client API for Routing service
+
+type RoutingService interface {
+	Route(ctx context.Context, in *RouteRequest, opts ...client.CallOption) (*RouteResponse, error)
+}
+
+type routingService struct {
+	c    client.Client
+	name string
+}
+
+func NewRoutingService(name string, c client.Client) RoutingService {
+	return &routingService{
+		c:    c,
+		name: name,
+	}
+}
+
+func (c *routingService) Route(ctx context.Context, in *RouteRequest, opts ...client.CallOption) (*RouteResponse, error) {
+	req := c.c.NewRequest(c.name, "Routing.Route", in)
+	out := new(RouteResponse)
+	err := c.c.Call(ctx, req, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+// Server API for Routing service
+
+type RoutingHandler interface {
+	Route(context.Context, *RouteRequest, *RouteResponse) error
+}
+
+func RegisterRoutingHandler(s server.Server, hdlr RoutingHandler, opts ...server.HandlerOption) error {
+	type routing interface {
+		Route(ctx context.Context, in *RouteRequest, out *RouteResponse) error
+	}
+	type Routing struct {
+		routing
+	}
+	h := &routingHandler{hdlr}
+	return s.Handle(s.NewHandler(&Routing{h}, opts...))
+}
+
+type routingHandler struct {
+	RoutingHandler
+}
+
+func (h *routingHandler) Route(ctx context.Context, in *RouteRequest, out *RouteResponse) error {
+	return h.RoutingHandler.Route(ctx, in, out)
+}
--- a/routing/proto/routing.proto
+++ b/routing/proto/routing.proto
@@ -0,0 +1,22 @@
+syntax = "proto3";
+
+package routing;
+import "google/protobuf/wrappers.proto";
+
+service Routing {
+	rpc Route(RouteRequest) returns (RouteResponse) {}
+}
+
+message Point {
+	google.protobuf.DoubleValue latitude = 1;
+	google.protobuf.DoubleValue longitude = 2;
+}
+
+message RouteRequest {
+	Point origin = 1;
+	Point destination = 2;
+}
+
+message RouteResponse {
+	repeated Point waypoints = 1;
+}