private async Task <GeoResult> GetGeoFromIPAddressesAsync(IEnumerable <string> ips)
{
foreach (var ip in ips)
{
if (String.IsNullOrEmpty(ip))
{
continue;
}
var cacheValue = await _localCache.GetAsync <GeoResult>(ip).AnyContext();
if (cacheValue.HasValue && cacheValue.IsNull)
{
continue;
}
if (cacheValue.HasValue)
{
return(cacheValue.Value);
}
var result = await _geoIpService.ResolveIpAsync(ip).AnyContext();
if (result == null || !result.IsValid())
{
await _localCache.SetAsync <GeoResult>(ip, null).AnyContext();
continue;
}
await _localCache.SetAsync(ip, result).AnyContext();
return(result);
}
return(null);
}
