public override void Process(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
ProcessAsync(message, pipeline, false).EnsureCompleted();
}
public override async Task ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
await ProcessNextAsync(message, pipeline).ConfigureAwait(false);
await BufferResponse(message, true).ConfigureAwait(false);
}
protected static async Task ProcessNextAsync(ReadOnlyMemory <HttpPipelinePolicy> pipeline, HttpPipelineMessage message)
{
if (pipeline.IsEmpty)
{
throw new InvalidOperationException("last policy in the pipeline must be a transport");
}
var next = pipeline.Span[0];
await next.ProcessAsync(message, pipeline.Slice(1)).ConfigureAwait(false);
}
public override Task ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
Debug.Assert(pipeline.IsEmpty);
return(_transport.ProcessAsync(message));
}
public override async ValueTask ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
await ProcessAsync(message, pipeline, true).ConfigureAwait(false);
}
/// <summary> /// Applies the policy to the <see cref="message"/>. Implementers are expected to mutate <see cref="HttpPipelineMessage.Request"/> before calling <see cref="ProcessNextAsync"/> and observe the <see cref="HttpPipelineMessage.Response"/> changes after. /// Last policy in the pipeline is expected to set the <see cref="HttpPipelineMessage.Response"/> /// </summary> /// <param name="message">The <see cref="HttpPipelineMessage"/> this policy would be applied to.</param> /// <param name="pipeline">The set of <see cref="HttpPipelinePolicy"/> to execute after current one.</param> /// <returns></returns> public abstract Task ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline);
public abstract void Process(HttpPipelineMessage message);
private static async Task ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline, bool async)
{
if (!s_eventSource.IsEnabled())
{
if (async)
{
await ProcessNextAsync(message, pipeline).ConfigureAwait(false);
}
else
{
ProcessNext(message, pipeline);
}
return;
}
s_eventSource.Request(message.Request);
Encoding?requestTextEncoding = null;
bool textRequest = message.Request.TryGetHeader(HttpHeader.Names.ContentType, out var contentType) &&
ContentTypeUtilities.TryGetTextEncoding(contentType, out requestTextEncoding);
if (message.Request.Content != null)
{
if (textRequest)
{
if (async)
{
await s_eventSource.RequestContentTextAsync(message.Request, requestTextEncoding !, message.CancellationToken).ConfigureAwait(false);
}
else
{
s_eventSource.RequestContentText(message.Request, requestTextEncoding !, message.CancellationToken);
}
}
else
{
if (async)
{
await s_eventSource.RequestContentAsync(message.Request, message.CancellationToken).ConfigureAwait(false);
}
else
{
s_eventSource.RequestContent(message.Request, message.CancellationToken);
}
}
}
var before = Stopwatch.GetTimestamp();
if (async)
{
await ProcessNextAsync(message, pipeline).ConfigureAwait(false);
}
else
{
ProcessNext(message, pipeline);
}
var after = Stopwatch.GetTimestamp();
bool isError = message.ResponseClassifier.IsErrorResponse(message);
var textResponse = ContentTypeUtilities.TryGetTextEncoding(message.Response.Headers.ContentType, out Encoding? responseTextEncoding);
bool wrapResponseStream = message.Response.ContentStream != null && message.Response.ContentStream?.CanSeek == false && s_eventSource.ShouldLogContent(isError);
if (wrapResponseStream)
{
message.Response.ContentStream = new LoggingStream(
message.Response.ClientRequestId, s_eventSource, message.Response.ContentStream !, isError, responseTextEncoding);
}
if (isError)
{
s_eventSource.ErrorResponse(message.Response);
if (!wrapResponseStream && message.Response.ContentStream != null)
{
if (textResponse)
{
if (async)
{
await s_eventSource.ErrorResponseContentTextAsync(message.Response, responseTextEncoding !, message.CancellationToken).ConfigureAwait(false);
}
else
{
s_eventSource.ErrorResponseContentText(message.Response, responseTextEncoding !);
}
}
else
{
if (async)
{
await s_eventSource.ErrorResponseContentAsync(message.Response, message.CancellationToken).ConfigureAwait(false);
}
else
{
s_eventSource.ErrorResponseContent(message.Response);
}
}
}
}
s_eventSource.Response(message.Response);
if (!wrapResponseStream && message.Response.ContentStream != null)
{
if (textResponse)
{
if (async)
{
await s_eventSource.ResponseContentTextAsync(message.Response, responseTextEncoding !, message.CancellationToken).ConfigureAwait(false);
}
else
{
s_eventSource.ResponseContentText(message.Response, responseTextEncoding !);
}
}
else
{
if (async)
{
await s_eventSource.ResponseContentAsync(message.Response, message.CancellationToken).ConfigureAwait(false);
}
else
{
s_eventSource.ResponseContent(message.Response);
}
}
}
var elapsedMilliseconds = (after - before) * 1000 / s_frequency;
if (elapsedMilliseconds > DelayWarningThreshold)
{
s_eventSource.ResponseDelay(message.Response, elapsedMilliseconds);
}
}
public override void Process(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
Debug.Assert(pipeline.IsEmpty);
_transport.Process(message);
}
internal HttpMessageOptions(HttpPipelineMessage message) => _message = message;
/// <summary>
/// Specifies if the response is not successful but can be retried.
/// </summary>
public virtual bool IsErrorResponse(HttpPipelineMessage message)
{
var statusKind = message.Response.Status / 100;
return(statusKind == 4 || statusKind == 5);
}
/// <summary>
/// Specifies if the response should terminate the pipeline and not be retried.
/// </summary>
public virtual bool IsRetriableResponse(HttpPipelineMessage message)
{
return(message.Response.Status == 429 || message.Response.Status == 503);
}
public override void Process(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
ProcessNext(message, pipeline);
BufferResponse(message, false).EnsureCompleted();
}
/// <summary>
/// Invokes the next <see cref="HttpPipelinePolicy"/> in the <see cref="pipeline"/>.
/// </summary>
/// <param name="message">The <see cref="HttpPipelineMessage"/> next policy would be applied to.</param>
/// <param name="pipeline">The set of <see cref="HttpPipelinePolicy"/> to execute after next one.</param>
/// <returns></returns>
protected static Task ProcessNextAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
return(pipeline.Span[0].ProcessAsync(message, pipeline.Slice(1)));
}
public abstract ValueTask ProcessAsync(HttpPipelineMessage message);
protected static void ProcessNext(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
pipeline.Span[0].Process(message, pipeline.Slice(1));
}
public override void Process(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
OnSendingRequest(message);
ProcessNext(message, pipeline);
OnReceivedResponse(message);
}
private async Task ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline, bool async)
{
int attempt = 0;
List <Exception> exceptions = null;
while (true)
{
Exception lastException = null;
try
{
if (async)
{
await ProcessNextAsync(message, pipeline).ConfigureAwait(false);
}
else
{
ProcessNext(message, pipeline);
}
}
catch (Exception ex)
{
if (exceptions == null)
{
exceptions = new List <Exception>();
}
exceptions.Add(ex);
lastException = ex;
}
TimeSpan delay;
attempt++;
var shouldRetry = attempt <= _maxRetries;
if (lastException != null)
{
if (shouldRetry && message.ResponseClassifier.IsRetriableException(lastException))
{
GetDelay(attempt, out delay);
}
else
{
// Rethrow a singular exception
if (exceptions.Count == 1)
{
ExceptionDispatchInfo.Capture(lastException).Throw();
}
throw new AggregateException($"Retry failed after {attempt} tries.", exceptions);
}
}
else if (message.ResponseClassifier.IsErrorResponse(message.Response))
{
if (shouldRetry && message.ResponseClassifier.IsRetriableResponse(message.Response))
{
GetDelay(message, attempt, out delay);
}
else
{
return;
}
}
else
{
return;
}
if (delay > TimeSpan.Zero)
{
if (async)
{
await WaitAsync(delay, message.CancellationToken).ConfigureAwait(false);
}
else
{
Wait(delay, message.CancellationToken);
}
}
HttpPipelineEventSource.Singleton.RequestRetrying(message.Request, attempt);
}
}
public virtual void OnSendingRequest(HttpPipelineMessage message)
{
}
private async ValueTask ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline, bool async)
{
if (!s_eventSource.IsEnabled())
{
if (async)
{
await ProcessNextAsync(message, pipeline).ConfigureAwait(false);
}
else
{
ProcessNext(message, pipeline);
}
return;
}
s_eventSource.Request(message.Request);
Encoding?requestTextEncoding = null;
if (message.Request.TryGetHeader(HttpHeader.Names.ContentType, out var contentType))
{
ContentTypeUtilities.TryGetTextEncoding(contentType, out requestTextEncoding);
}
var logWrapper = new ContentEventSourceWrapper(s_eventSource, _logContent, _maxLength, message.CancellationToken);
await logWrapper.LogAsync(message.Request.ClientRequestId, message.Request.Content, requestTextEncoding, async).ConfigureAwait(false).EnsureCompleted(async);
var before = Stopwatch.GetTimestamp();
if (async)
{
await ProcessNextAsync(message, pipeline).ConfigureAwait(false);
}
else
{
ProcessNext(message, pipeline);
}
var after = Stopwatch.GetTimestamp();
bool isError = message.ResponseClassifier.IsErrorResponse(message);
ContentTypeUtilities.TryGetTextEncoding(message.Response.Headers.ContentType, out Encoding? responseTextEncoding);
bool wrapResponseContent = message.Response.ContentStream != null &&
message.Response.ContentStream.CanSeek == false &&
logWrapper.IsEnabled(isError);
if (isError)
{
s_eventSource.ErrorResponse(message.Response);
}
else
{
s_eventSource.Response(message.Response);
}
if (wrapResponseContent)
{
message.Response.ContentStream = new LoggingStream(message.Response.ClientRequestId, logWrapper, _maxLength, message.Response.ContentStream !, isError, responseTextEncoding);
}
else
{
await logWrapper.LogAsync(message.Response.ClientRequestId, isError, message.Response.ContentStream, responseTextEncoding, async).ConfigureAwait(false).EnsureCompleted(async);
}
var elapsedMilliseconds = (after - before) * 1000 / Stopwatch.Frequency;
if (elapsedMilliseconds > DelayWarningThreshold)
{
s_eventSource.ResponseDelay(message.Response, elapsedMilliseconds);
}
}
public virtual void OnReceivedResponse(HttpPipelineMessage message)
{
}
public abstract void Process(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline);
public override void Process(HttpPipelineMessage message)
{
// Intentionally blocking here
ProcessAsync(message).GetAwaiter().GetResult();
}
protected static void ProcessNext(ReadOnlyMemory <HttpPipelinePolicy> pipeline, HttpPipelineMessage message)
{
if (pipeline.IsEmpty)
{
throw new InvalidOperationException("last policy in the pipeline must be a transport");
}
pipeline.Span[0].Process(message, pipeline.Slice(1));
}
public ValueTask SendAsync(HttpPipelineMessage message, CancellationToken cancellationToken)
{
message.CancellationToken = cancellationToken;
return(_pipeline.Span[0].ProcessAsync(message, _pipeline.Slice(1)));
}
public override ValueTask ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline)
{
return(ProcessAsync(message, pipeline, true));
}
public void Send(HttpPipelineMessage message, CancellationToken cancellationToken)
{
message.CancellationToken = cancellationToken;
_pipeline.Span[0].Process(message, _pipeline.Slice(1));
}
public override void OnSendingRequest(HttpPipelineMessage message)
{
message.Request.Headers.Add(HttpHeader.Names.UserAgent, _header);
}
private async ValueTask ProcessAsync(HttpPipelineMessage message, ReadOnlyMemory <HttpPipelinePolicy> pipeline, bool isAsync)
{
if (!_isDistributedTracingEnabled)
{
if (isAsync)
{
await ProcessNextAsync(message, pipeline, true).ConfigureAwait(false);
}
else
{
ProcessNextAsync(message, pipeline, false).EnsureCompleted();
}
return;
}
if (!s_diagnosticSource.IsEnabled())
{
await ProcessNextAsync(message, pipeline, isAsync).ConfigureAwait(false);
return;
}
var activity = new Activity("Azure.Core.Http.Request");
activity.AddTag("http.method", message.Request.Method.Method);
activity.AddTag("http.url", message.Request.Uri.ToString());
activity.AddTag("requestId", message.Request.ClientRequestId);
if (message.Request.Headers.TryGetValue("User-Agent", out string?userAgent))
{
activity.AddTag("http.user_agent", userAgent);
}
var diagnosticSourceActivityEnabled = s_diagnosticSource.IsEnabled(activity.OperationName, message);
if (diagnosticSourceActivityEnabled)
{
s_diagnosticSource.StartActivity(activity, message);
}
else
{
activity.Start();
}
if (isAsync)
{
await ProcessNextAsync(message, pipeline, true).ConfigureAwait(false);
}
else
{
ProcessNextAsync(message, pipeline, false).EnsureCompleted();
}
activity.AddTag("http.status_code", message.Response.Status.ToString(CultureInfo.InvariantCulture));
activity.AddTag("serviceRequestId", message.Response.Headers.RequestId);
if (diagnosticSourceActivityEnabled)
{
s_diagnosticSource.StopActivity(activity, message);
}
else
{
activity.Stop();
}
}
