// InitGeoIP opens a GeoIP2/GeoLite2 MaxMind database and prepares
// it for lookups.
func InitGeoIP(config *Config) error {
discoveryValueHMACKey = config.DiscoveryValueHMACKey
if config.GeoIPDatabaseFilename != "" {
var err error
geoIPReader, err = maxminddb.Open(config.GeoIPDatabaseFilename)
if err != nil {
return psiphon.ContextError(err)
}
log.WithContext().Info("GeoIP initialized")
}
return nil
}
// NewGeoIPService initializes a new GeoIPService.
func NewGeoIPService(
databaseFilenames []string,
discoveryValueHMACKey string) (*GeoIPService, error) {
geoIP := &GeoIPService{
databases: make([]*geoIPDatabase, len(databaseFilenames)),
sessionCache: cache.New(GEOIP_SESSION_CACHE_TTL, 1*time.Minute),
discoveryValueHMACKey: discoveryValueHMACKey,
}
for i, filename := range databaseFilenames {
database := &geoIPDatabase{}
database.ReloadableFile = common.NewReloadableFile(
filename,
func(filename string) error {
maxMindReader, err := maxminddb.Open(filename)
if err != nil {
// On error, database state remains the same
return common.ContextError(err)
}
if database.maxMindReader != nil {
database.maxMindReader.Close()
}
database.maxMindReader = maxMindReader
return nil
})
_, err := database.Reload()
if err != nil {
return nil, common.ContextError(err)
}
geoIP.databases[i] = database
}
return geoIP, nil
}