Add method to get database infos

geoip.go

@@ -2,7 +2,7 @@
 package geoip
 
 /*
-#cgo pkg-config: geoip  
+#cgo pkg-config: geoip
 #include <stdio.h>
 #include <errno.h>
 #include <GeoIP.h>
@@ -338,3 +338,19 @@ func (gi *GeoIP) GetCountry_v6(ip string) (cc string, netmask int) {
 	}
 	return
 }
+
+func (gi *GeoIP) GetDatabaseInfo() string {
+	if gi.db == nil {
+		return ""
+	}
+
+	gi.mu.Lock()
+	defer gi.mu.Unlock()
+
+	cdbinfo := C.GeoIP_database_info(gi.db)
+	defer C.free(unsafe.Pointer(cdbinfo))
+	if cdbinfo != nil {
+		return C.GoString(cdbinfo)
+	}
+	return ""
+}

geoip_test.go

@@ -122,3 +122,14 @@ func (s *GeoIPSuite) TestRegionName(c *C) {
 	regionName = GetRegionName("CA", "ON")
 	c.Check(regionName, Equals, "Ontario")
 }
+
+func (s *GeoIPSuite) TestDatabaseInfo(c *C) {
+	gi, err := Open("test-db/GeoIP.dat")
+	if err != nil {
+		fmt.Printf("Could not open GeoIP database: %s\n", err)
+		return
+	}
+
+	databaseInfo := gi.GetDatabaseInfo()
+	c.Check(databaseInfo, Equals, "")
+}