[WIP] Moving test services to this repo

rpc/rpc-server/handler/util.go

@@ -0,0 +1,52 @@
+package handler
+
+import (
+	"fmt"
+	"math"
+
+	pb "github.com/micro/micro/v3/test/service/rpc/proto"
+)
+
+func toRadians(num float64) float64 {
+	return num * math.Pi / float64(180)
+}
+
+// calcDistance calculates the distance between two points using the "haversine" formula.
+// The formula is based on http://mathforum.org/library/drmath/view/51879.html.
+func calcDistance(p1 *pb.Point, p2 *pb.Point) int32 {
+	const CordFactor float64 = 1e7
+	const R = float64(6371000) // earth radius in metres
+	lat1 := toRadians(float64(p1.Latitude) / CordFactor)
+	lat2 := toRadians(float64(p2.Latitude) / CordFactor)
+	lng1 := toRadians(float64(p1.Longitude) / CordFactor)
+	lng2 := toRadians(float64(p2.Longitude) / CordFactor)
+	dlat := lat2 - lat1
+	dlng := lng2 - lng1
+
+	a := math.Sin(dlat/2)*math.Sin(dlat/2) +
+		math.Cos(lat1)*math.Cos(lat2)*
+			math.Sin(dlng/2)*math.Sin(dlng/2)
+	c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
+
+	distance := R * c
+	return int32(distance)
+}
+
+func inRange(point *pb.Point, rect *pb.Rectangle) bool {
+	left := math.Min(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
+	right := math.Max(float64(rect.Lo.Longitude), float64(rect.Hi.Longitude))
+	top := math.Max(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
+	bottom := math.Min(float64(rect.Lo.Latitude), float64(rect.Hi.Latitude))
+
+	if float64(point.Longitude) >= left &&
+		float64(point.Longitude) <= right &&
+		float64(point.Latitude) >= bottom &&
+		float64(point.Latitude) <= top {
+		return true
+	}
+	return false
+}
+
+func serialize(point *pb.Point) string {
+	return fmt.Sprintf("%d %d", point.Latitude, point.Longitude)
+}