Add location service (#29)

* Add location service

* Update README.md

location/handler/handler.go

@@ -0,0 +1,67 @@
+package handler
+
+import (
+	"context"
+	"log"
+
+	"github.com/micro/micro/v3/service"
+	"github.com/micro/micro/v3/service/errors"
+	"github.com/micro/services/location/domain"
+	loc "github.com/micro/services/location/proto"
+	"github.com/micro/services/location/subscriber"
+)
+
+type Location struct{}
+
+func (l *Location) Read(ctx context.Context, req *loc.ReadRequest, rsp *loc.ReadResponse) error {
+	log.Print("Received Location.Read request")
+
+	id := req.Id
+
+	if len(id) == 0 {
+		return errors.BadRequest("location.read", "Require Id")
+	}
+
+	entity, err := domain.Read(id)
+	if err != nil {
+		return err
+	}
+
+	rsp.Entity = entity.ToProto()
+
+	return nil
+}
+
+func (l *Location) Save(ctx context.Context, req *loc.SaveRequest, rsp *loc.SaveResponse) error {
+	log.Print("Received Location.Save request")
+
+	entity := req.GetEntity()
+
+	if entity.GetLocation() == nil {
+		return errors.BadRequest("location.save", "Require location")
+	}
+
+	p := service.NewEvent(subscriber.Topic)
+	if err := p.Publish(ctx, entity); err != nil {
+		return errors.InternalServerError("location.save", err.Error())
+	}
+
+	return nil
+}
+
+func (l *Location) Search(ctx context.Context, req *loc.SearchRequest, rsp *loc.SearchResponse) error {
+	log.Print("Received Location.Search request")
+
+	entity := &domain.Entity{
+		Latitude:  req.Center.Latitude,
+		Longitude: req.Center.Longitude,
+	}
+
+	entities := domain.Search(req.Type, entity, req.Radius, int(req.NumEntities))
+
+	for _, e := range entities {
+		rsp.Entities = append(rsp.Entities, e.ToProto())
+	}
+
+	return nil
+}