feat: first version.

geoip/geoip.go

@@ -0,0 +1,69 @@
+package geoip
+
+import (
+	_ "embed"
+	"errors"
+	"net"
+
+	"github.com/go-kratos/kratos/v2/log"
+	"github.com/oschwald/geoip2-golang"
+)
+
+//go:embed GeoLite2-City.mmdb
+var geoipMmdbByte []byte
+
+type Result struct {
+	Country  string // 国家
+	Province string // 省
+	City     string // 城市
+}
+
+// GeoIp 地理位置解析结构体
+type GeoIp struct {
+	db             *geoip2.Reader
+	outputLanguage string
+}
+
+// NewGeoIp .
+func NewGeoIp() (geoip *GeoIp, err error) {
+	db, err := geoip2.FromBytes(geoipMmdbByte)
+	if err != nil {
+		return nil, err
+	}
+	return &GeoIp{db: db, outputLanguage: "zh-CN"}, nil
+}
+
+func (g *GeoIp) Close() (err error) {
+	return g.db.Close()
+}
+
+// SetLanguage 设置输出的语言，默认为：zh-CN
+func (g *GeoIp) SetLanguage(code string) {
+	g.outputLanguage = code
+}
+
+func (g *GeoIp) query(rawIP string) (city *geoip2.City, err error) {
+	ip := net.ParseIP(rawIP)
+	if ip == nil {
+		return nil, errors.New("invalid ip")
+	}
+
+	return g.db.City(ip)
+}
+
+// GetAreaFromIP 通过IP获取地区
+func (g *GeoIp) GetAreaFromIP(rawIP string) (ret Result, err error) {
+	record, err := g.query(rawIP)
+	if err != nil {
+		log.Fatal(err)
+		return ret, err
+	}
+
+	ret.Country = record.Country.Names[g.outputLanguage]
+	if len(record.Subdivisions) > 0 {
+		ret.Province = record.Subdivisions[0].Names[g.outputLanguage]
+	}
+	ret.City = record.City.Names[g.outputLanguage]
+
+	return
+}

geoip/geoip_test.go

@@ -0,0 +1,17 @@
+package geoip
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func TestGeoIp(t *testing.T) {
+	g, err := NewGeoIp()
+	assert.Nil(t, err)
+
+	ret, err := g.GetAreaFromIP("47.108.149.89")
+	assert.Nil(t, err)
+	assert.Equal(t, ret.Country, "中国")
+	assert.Equal(t, ret.Province, "四川省")
+	assert.Equal(t, ret.City, "成都")
+}