private async Task Poll()
{
var services = await ConsulDiscoveryService.GetAsync(Option.Service);
if (services == null)
{
services = new List <MicroService>();
}
var key = GetCacheKey();
await ServiceCache.SetAsync(key, services, new DistributedCacheEntryOptions()
{
AbsoluteExpirationRelativeToNow = TimeSpan.FromSeconds(Option.Expires)
});
}