public async Task <HttpResponseMessage> SendRequest(HttpRequestMessage request)
{
EndpointOption endpoint = SelectEndpointForRequest(request);
string cacheKey = CalculateCacheKeyForEndpoint(endpoint);
HttpClient client = GetOrCreateHttpClient(endpoint, cacheKey);
HttpResponseMessage response = await client.SendAsync(request);
return(response);
}
public void RegisterTransitionAction(string transitionKey, EndpointOption option, params Action[] actions)
{
var found = Machine.States.FirstOrDefault(x => x.Name.Equals(transitionKey, StringComparison.OrdinalIgnoreCase));
if (found != null)
{
if (found.EndpointActions == null)
{
found.EndpointActions = new List <IEndpointAction>();
}
found.EndpointActions.Add(new EndpointAction(option, actions));
}
}
private HttpClient GetOrCreateHttpClient(EndpointOption endpoint, string cacheKey)
{
var cachedHttpClient = cache.GetOrCreate <HttpClient>(cacheKey, entry => {
//Questa entry della cache verrà invalidata al ricaricamento della configurazione
entry.AddExpirationToken(configuration.GetReloadToken());
//Mi sottoscrivo alla rimozione dalla cache, così che possa fare il dispose
entry.PostEvictionCallbacks.Add(GetPostEvictionCallbackRegistration());
//Creo l'istanza che verrà messa in cache
HttpClient client = CreateHttpClient(endpoint);
return(client);
});
return(cachedHttpClient);
}
private HttpClient CreateHttpClient(EndpointOption endpoint)
{
var handler = new HttpClientHandler();
if (!string.IsNullOrEmpty(endpoint.Proxy))
{
handler.Proxy = new WebProxy(endpoint.Proxy);
handler.UseProxy = true;
}
//TODO: dalle opzioni potrebbero arrivare anche autenticazione, headers, ecc.
var client = new HttpClient(handler, disposeHandler: true);
logger.LogInformation($"Created a new instance of HttpClient for endpoint '{endpoint.Name}'");
return(client);
}
private string CalculateCacheKeyForEndpoint(EndpointOption endpoint)
{
return($"endpoint-{endpoint.Selector}");
}
public EndpointAction(EndpointOption endpointOption, params Action[] actions)
{
_EndpointOption = endpointOption;
_Actions = new List <Action>(actions);
}
