Ip (#133)

* add the ip service

* update readme

ip/handler/ip.go

@@ -0,0 +1,56 @@
+package handler
+
+import (
+	"context"
+	"net"
+
+	"github.com/micro/micro/v3/service/errors"
+	"github.com/micro/micro/v3/service/logger"
+	pb "github.com/micro/services/ip/proto"
+	geoip2 "github.com/oschwald/geoip2-golang"
+)
+
+type Ip struct {
+	ASNReader  *geoip2.Reader
+	CityReader *geoip2.Reader
+}
+
+func (i *Ip) Lookup(ctx context.Context, req *pb.LookupRequest, rsp *pb.LookupResponse) error {
+	if len(req.Ip) == 0 {
+		return errors.BadRequest("ip.lookup", "missing ip")
+	}
+
+	// get the ip
+	ip := net.ParseIP(req.Ip)
+
+	// only if the asn reader exists
+	if i.ASNReader != nil {
+		asn, err := i.ASNReader.ASN(ip)
+		if err != nil {
+			logger.Errorf("failed to lookup asn for %v: %v", req.Ip, err)
+			return errors.InternalServerError("ip.lookup", "failed to lookup ip")
+		}
+		// set asp
+		rsp.Asn = int64(asn.AutonomousSystemNumber)
+	}
+
+	info, err := i.CityReader.City(ip)
+	if err != nil {
+		logger.Errorf("failed to lookup city for %v: %v", req.Ip, err)
+		return errors.InternalServerError("ip.lookup", "failed to lookup ip")
+	}
+
+	// set ip
+	rsp.Ip = req.Ip
+	// set city
+	rsp.City = info.City.Names["en"]
+	// set countr
+	rsp.Country = info.Country.Names["en"]
+	// latitude/longitude
+	rsp.Latitude = info.Location.Latitude
+	rsp.Longitude = info.Location.Longitude
+	// set timezone
+	rsp.Timezone = info.Location.TimeZone
+
+	return nil
+}