public async Task<Location> ResolveIpAsync(string ip, CancellationToken cancellationToken = new CancellationToken()) {
if (String.IsNullOrWhiteSpace(ip) || (!ip.Contains(".") && !ip.Contains(":")))
return null;
ip = ip.Trim();
Location location;
if (_cache.TryGet(ip, out location))
return location;
if (ip.IsPrivateNetwork())
return null;
var database = await GetDatabaseAsync(cancellationToken);
if (database == null)
return null;
try {
var city = database.City(ip);
if (city != null && city.Location != null)
location = new Location { Latitude = city.Location.Latitude, Longitude = city.Location.Longitude };
_cache.Set(ip, location);
return location;
} catch (Exception ex) {
if (ex is AddressNotFoundException || ex is GeoIP2Exception) {
Log.Trace().Message(ex.Message).Write();
_cache.Set<Location>(ip, null);
} else {
Log.Error().Exception(ex).Message("Unable to resolve geo location for ip: " + ip).Write();
}
return null;
}
}
public static bool TryParse(string input, out Location location) {
location = null;
if (String.IsNullOrWhiteSpace(input) || !input.Contains(","))
return false;
string[] parts = input.Split(new[] { ',' }, StringSplitOptions.RemoveEmptyEntries);
if (parts.Length != 2)
return false;
double latitude;
if (!Double.TryParse(parts[0], out latitude))
return false;
double longitude;
if (!Double.TryParse(parts[1], out longitude))
return false;
location = new Location { Latitude = latitude, Longitude = longitude };
return true;
}