private static async Task <TApi> callAndDeserializeSingleObjectAsync <TApi, TJson>(
HttpClient httpClient,
IThrottler throttler,
HttpMethod method,
Uri endpointUri,
CancellationToken cancellationToken)
where TJson : TApi
{
for (var attempts = 0; attempts < throttler.MaxRetryAttempts; ++attempts)
{
await throttler.WaitToProceed(cancellationToken).ConfigureAwait(false);
using var request = new HttpRequestMessage(method, endpointUri);
using var response = await httpClient
.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken)
.ConfigureAwait(false);
// Check response for server and caller specified waits and retries
if (throttler.CheckHttpResponse(response))
{
return(await response.DeserializeAsync <TApi, TJson>()
.ConfigureAwait(false));
}
}
throw new RestClientErrorException(
$"Unable to successfully call REST API endpoint `{endpointUri}` after {throttler.MaxRetryAttempts} attempts.");
}
private async Task <TApi> callAndDeserializeSingleObjectAsync <TApi, TJson>(
HttpClient httpClient,
IThrottler throttler,
Uri endpointUri,
CancellationToken cancellationToken,
HttpMethod method = null)
where TJson : TApi
{
var exceptions = new Queue <Exception>();
for (var attempts = 0; attempts < throttler.MaxRetryAttempts; ++attempts)
{
await throttler.WaitToProceed(cancellationToken).ConfigureAwait(false);
try
{
using (var request = new HttpRequestMessage(method ?? HttpMethod.Get, endpointUri))
using (var response = await httpClient
.SendAsync(request, HttpCompletionOption.ResponseHeadersRead, cancellationToken)
.ConfigureAwait(false))
{
// Check response for server and caller specified waits and retries
if (!throttler.CheckHttpResponse(response))
{
continue;
}
return(await deserializeAsync <TApi, TJson>(response).ConfigureAwait(false));
}
}
catch (HttpRequestException ex)
{
if (attempts >= throttler.MaxRetryAttempts)
{
exceptions.Enqueue(ex);
break;
}
else
{
continue;
}
}
catch (Exception)
{
if (attempts < throttler.MaxRetryAttempts)
{
continue;
}
else
{
throw;
}
}
}
throw new AggregateException(exceptions);
}
private async Task <TApi> getSingleObjectAsync <TApi, TJson>(
HttpClient httpClient,
IThrottler throttler,
String endpointUri)
where TJson : TApi
{
var exceptions = new Queue <Exception>();
for (var attempts = 0; attempts < throttler.MaxRetryAttempts; ++attempts)
{
await throttler.WaitToProceed();
try
{
using (var response = await httpClient.GetAsync(endpointUri, HttpCompletionOption.ResponseHeadersRead))
{
// Check response for server and caller specified waits and retries
if (!throttler.CheckHttpResponse(response))
{
continue;
}
using (var stream = await response.Content.ReadAsStreamAsync())
using (var reader = new JsonTextReader(new StreamReader(stream)))
{
var serializer = new JsonSerializer();
if (response.IsSuccessStatusCode)
{
return(serializer.Deserialize <TJson>(reader));
}
try
{
throw new RestClientErrorException(
serializer.Deserialize <JsonError>(reader));
}
catch (Exception exception)
{
throw new RestClientErrorException(response, exception);
}
}
}
}
catch (HttpRequestException ex)
{
exceptions.Enqueue(ex);
break;
}
}
throw new AggregateException(exceptions);
}