feat: optimization

internal/geoip/lookup.go

@@ -0,0 +1,40 @@
+package geoip
+
+import (
+	"net"
+	"github.com/oschwald/geoip2-golang"
+)
+
+type Database struct {
+	reader *geoip2.Reader
+}
+
+func Open(path string) (*Database, error) {
+	r, err := geoip2.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	return &Database{reader: r}, nil
+}
+
+func (d *Database) Lookup(ipStr string) string {
+	if d == nil || d.reader == nil {
+		return "N/A"
+	}
+	
+	ip := net.ParseIP(ipStr)
+	if ip == nil {
+		return "INVALID_IP"
+	}
+
+	record, err := d.reader.Country(ip)
+	if err != nil || record.Country.IsoCode == "" {
+		return "UNKNOWN"
+	}
+
+	return record.Country.IsoCode
+}
+
+func (d *Database) Close() {
+	d.reader.Close()
+}