async Task <DurableHttpResponse> IDurableOrchestrationContext.CallHttpAsync(DurableHttpRequest req)
{
DurableHttpResponse durableHttpResponse = await this.ScheduleDurableHttpActivityAsync(req);
HttpStatusCode currStatusCode = durableHttpResponse.StatusCode;
while (currStatusCode == HttpStatusCode.Accepted && req.AsynchronousPatternEnabled)
{
Dictionary <string, StringValues> headersDictionary = new Dictionary <string, StringValues>(durableHttpResponse.Headers);
DateTime fireAt = default(DateTime);
if (headersDictionary.ContainsKey("Retry-After"))
{
fireAt = this.InnerContext.CurrentUtcDateTime.AddSeconds(int.Parse(headersDictionary["Retry-After"]));
}
else
{
fireAt = this.InnerContext.CurrentUtcDateTime.AddMilliseconds(this.Config.Options.HttpSettings.DefaultAsyncRequestSleepTimeMilliseconds);
}
this.IncrementActionsOrThrowException();
await this.InnerContext.CreateTimer(fireAt, CancellationToken.None);
DurableHttpRequest durableAsyncHttpRequest = this.CreateHttpRequestMessageCopy(req, durableHttpResponse.Headers["Location"]);
durableHttpResponse = await this.ScheduleDurableHttpActivityAsync(durableAsyncHttpRequest);
currStatusCode = durableHttpResponse.StatusCode;
}
return(durableHttpResponse);
}
public async override Task <string> RunAsync(TaskContext context, string rawInput)
{
DurableHttpRequest durableHttpRequest = ReconstructDurableHttpRequest(rawInput);
HttpRequestMessage requestMessage = await this.ConvertToHttpRequestMessage(durableHttpRequest);
HttpResponseMessage response;
if (durableHttpRequest.Timeout == null)
{
response = await this.httpClient.SendAsync(requestMessage);
}
else
{
try
{
using (CancellationTokenSource cts = new CancellationTokenSource())
{
cts.CancelAfter(durableHttpRequest.Timeout.Value);
response = await this.httpClient.SendAsync(requestMessage, cts.Token);
}
}
catch (OperationCanceledException ex)
{
TimeoutException e = new TimeoutException(ex.Message + $" Reached user specified timeout: {durableHttpRequest.Timeout.Value}.");
string details = Utils.SerializeCause(e, this.config.ErrorDataConverter);
throw new TaskFailureException(e.Message, e, details);
}
}
DurableHttpResponse durableHttpResponse = await DurableHttpResponse.CreateDurableHttpResponseWithHttpResponseMessage(response);
return(JsonConvert.SerializeObject(durableHttpResponse));
}
Task <DurableHttpResponse> IDurableOrchestrationContext.CallHttpAsync(HttpMethod method, Uri uri, string content)
{
DurableHttpRequest req = new DurableHttpRequest(
method: method,
uri: uri,
content: content);
return(((IDurableOrchestrationContext)this).CallHttpAsync(req));
}
private async Task <HttpRequestMessage> ConvertToHttpRequestMessage(DurableHttpRequest durableHttpRequest)
{
string contentType = "";
HttpRequestMessage requestMessage = new HttpRequestMessage(durableHttpRequest.Method, durableHttpRequest.Uri);
if (durableHttpRequest.Headers != null)
{
foreach (KeyValuePair <string, StringValues> entry in durableHttpRequest.Headers)
{
if (entry.Key.Equals("Content-Type", StringComparison.OrdinalIgnoreCase))
{
foreach (string value in entry.Value)
{
if (value.Contains("multipart"))
{
throw new FunctionFailedException("Multipart content is not supported with CallHttpAsync.");
}
else
{
contentType = value;
}
}
}
else
{
requestMessage.Headers.Add(entry.Key, (IEnumerable <string>)entry.Value);
}
}
}
if (durableHttpRequest.Content != null)
{
if (contentType == "")
{
contentType = "text/plain";
}
if (string.Equals(contentType, "application/x-www-form-urlencoded", StringComparison.OrdinalIgnoreCase))
{
requestMessage.Content = new StringContent(durableHttpRequest.Content, Encoding.UTF8, contentType);
}
else
{
requestMessage.Content = new StringContent(durableHttpRequest.Content);
requestMessage.Content.Headers.ContentType = new MediaTypeHeaderValue(contentType);
}
}
if (durableHttpRequest.TokenSource != null)
{
string accessToken = await durableHttpRequest.TokenSource.GetTokenAsync();
requestMessage.Headers.Authorization = new AuthenticationHeaderValue("Bearer", accessToken);
}
return(requestMessage);
}
private static DurableHttpRequest ReconstructDurableHttpRequest(string serializedRequest)
{
// DeserializeObject deserializes into a List and then the first element
// of that list is the DurableHttpRequest
IList <DurableHttpRequest> input = JsonConvert.DeserializeObject <IList <DurableHttpRequest> >(serializedRequest);
DurableHttpRequest durableHttpRequest = input.First();
return(durableHttpRequest);
}
private DurableHttpRequest CreateHttpRequestMessageCopy(DurableHttpRequest durableHttpRequest, string locationUri)
{
DurableHttpRequest newDurableHttpRequest = new DurableHttpRequest(
method: HttpMethod.Get,
uri: new Uri(locationUri),
headers: durableHttpRequest.Headers,
content: durableHttpRequest.Content,
tokenSource: durableHttpRequest.TokenSource);
return(newDurableHttpRequest);
}
private async Task <DurableHttpResponse> ScheduleDurableHttpActivityAsync(DurableHttpRequest req)
{
DurableHttpResponse durableHttpResponse = await this.CallDurableTaskFunctionAsync <DurableHttpResponse>(
functionName : HttpOptions.HttpTaskActivityReservedName,
functionType : FunctionType.Activity,
oneWay : false,
instanceId : null,
operation : null,
retryOptions : null,
input : req);
return(durableHttpResponse);
}
private DurableHttpRequest CreateLocationPollRequest(DurableHttpRequest durableHttpRequest, string locationUri)
{
DurableHttpRequest newDurableHttpRequest = new DurableHttpRequest(
method: HttpMethod.Get,
uri: new Uri(locationUri),
headers: durableHttpRequest.Headers,
content: durableHttpRequest.Content,
tokenSource: durableHttpRequest.TokenSource);
// Do not copy over the x-functions-key header, as in many cases, the
// functions key used for the initial request will be a Function-level key
// and the status endpoint requires a master key.
newDurableHttpRequest.Headers.Remove("x-functions-key");
return(newDurableHttpRequest);
}