add osrm to routing service (#86)

routing/handler/osrm.go

@@ -0,0 +1,77 @@
+package handler
+
+import (
+	"context"
+	"net/url"
+	"time"
+
+	"github.com/gojuno/go.osrm"
+	"github.com/micro/micro/v3/service/errors"
+	pb "github.com/micro/services/routing/proto"
+	"github.com/paulmach/go.geo"
+)
+
+type OSRM struct {
+	// api address
+	Address string
+	// osrm client
+	Client *osrm.OSRM
+}
+
+func (o *OSRM) 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
+	}
+
+	if o.Client == nil {
+		u, _ := url.Parse(o.Address)
+		if u.Scheme == "" {
+			u.Scheme = "http"
+		}
+		o.Client = osrm.NewFromURL(u.String())
+	}
+
+	ctx, cancelFn := context.WithTimeout(context.Background(), time.Second)
+	defer cancelFn()
+
+	orig := req.Origin
+	dest := req.Destination
+
+	resp, err := o.Client.Route(ctx, osrm.RouteRequest{
+		Profile: "car",
+		Coordinates: osrm.NewGeometryFromPointSet(geo.PointSet{
+			{orig.Longitude, orig.Latitude},
+			{dest.Longitude, dest.Latitude},
+		}),
+		Steps:       osrm.StepsTrue,
+		Annotations: osrm.AnnotationsTrue,
+		Overview:    osrm.OverviewFalse,
+		Geometries:  osrm.GeometriesPolyline6,
+	})
+	if err != nil {
+		return errors.InternalServerError("routing.route", "failed to get route: %v", err.Error())
+	}
+
+	for _, waypoint := range resp.Waypoints {
+		rsp.Waypoints = append(rsp.Waypoints, &pb.Waypoint{
+			Name:     waypoint.Name,
+			Distance: float64(waypoint.Distance),
+			Location: &pb.Point{
+				Latitude:  waypoint.Location.Lat(),
+				Longitude: waypoint.Location.Lng(),
+			},
+		})
+	}
+
+	return nil
+}