private async Task <EtcdResponse> SendRequest(HttpMethod method, string requestUri, IEnumerable <KeyValuePair <string, string> > formFields = null)
{
HttpClientEx startClient = _currentClient;
HttpClientEx currentClient = _currentClient;
for (; ;)
{
try
{
using (HttpRequestMessage requestMessage = new HttpRequestMessage(method, requestUri))
{
if (formFields != null)
{
requestMessage.Content = new FormUrlEncodedContent(formFields);
}
using (HttpResponseMessage responseMessage = await currentClient.SendAsync(requestMessage))
{
string json = null;
if (responseMessage.Content != null)
{
json = await responseMessage.Content.ReadAsStringAsync();
}
if (!responseMessage.IsSuccessStatusCode)
{
if (!string.IsNullOrWhiteSpace(json))
{
ErrorResponse errorResponse = null;
try
{
errorResponse = _jsonDeserializer.Deserialize <ErrorResponse>(json);
}
catch { }
if (errorResponse != null)
{
throw EtcdGenericException.Create(requestMessage, errorResponse);
}
}
currentClient = currentClient.Next;
if (currentClient != startClient)
{
// try the next
continue;
}
else
{
responseMessage.EnsureSuccessStatusCode();
}
}
// if currentClient != _currentClient, update _currentClient
if (currentClient != startClient)
{
Interlocked.CompareExchange(ref _currentClient, currentClient, startClient);
}
if (!string.IsNullOrWhiteSpace(json))
{
EtcdResponse resp = _jsonDeserializer.Deserialize <EtcdResponse>(json);
resp.EtcdServer = currentClient.BaseAddress.OriginalString;
resp.EtcdClusterID = GetStringHeader(responseMessage, "X-Etcd-Cluster-Id");
resp.EtcdIndex = GetLongHeader(responseMessage, "X-Etcd-Index");
resp.RaftIndex = GetLongHeader(responseMessage, "X-Raft-Index");
resp.RaftTerm = GetLongHeader(responseMessage, "X-Raft-Term");
long previousIndex = _lastIndex;
if (resp.EtcdIndex > previousIndex)
{
Interlocked.CompareExchange(ref _lastIndex, resp.EtcdIndex, previousIndex);
}
this.ClusterID = resp.EtcdClusterID;
return(resp);
}
return(null);
}
}
}
catch (EtcdRaftException)
{
currentClient = currentClient.Next;
if (currentClient != startClient)
{
continue; // try the next
}
else
{
throw; // tried all clients, all failed
}
}
catch (EtcdGenericException)
{
throw;
}
catch (Exception)
{
currentClient = currentClient.Next;
if (currentClient != startClient)
{
continue; // try the next
}
else
{
throw; // tried all clients, all failed
}
}
}
}
