/// <summary>
/// Invokes the middleware for the current <paramref name="httpContext"/>.
/// </summary>
/// <param name="httpContext">The current <see cref="HttpContext"/>.</param>
/// <returns>An awaitable to wait for to complete the request.</returns>
public Task Invoke(HttpContext httpContext)
{
KeyValuePair <string, string> requestHeader = httpContext.Request.Headers.GetCorrelationIdHeader(_acceptedRequestHeaders);
if (requestHeader.Value != null)
{
_logger.LogTrace("Request header '{HeaderName}' found with correlation id '{CorrelationId}'.", requestHeader.Key, requestHeader.Value);
}
string responseHeaderName = _options.IncludeInResponse ? requestHeader.Key : null;
var correlatedHttpRequest = new HttpRequestActivity(_logger, httpContext, responseHeaderName);
return(_asyncCorrelationManager.CorrelateAsync(
requestHeader.Value,
() =>
{
correlatedHttpRequest.Start(_correlationContextAccessor.CorrelationContext);
return _next(httpContext)
.ContinueWith(t =>
{
correlatedHttpRequest.Stop();
return t;
})
.Unwrap();
}));
}
/// <summary>
/// Invokes the middleware for the current <paramref name="httpContext"/>.
/// </summary>
/// <param name="httpContext">The current <see cref="HttpContext"/>.</param>
/// <returns>An awaitable to wait for to complete the request.</returns>
public Task Invoke(HttpContext httpContext)
{
if (httpContext is null)
{
throw new ArgumentNullException(nameof(httpContext));
}
// ReSharper disable once UseDeconstruction - not supported in .NET46/.NETS
KeyValuePair <string, string?> requestHeader = httpContext.Request.Headers.GetCorrelationIdHeader(_acceptedRequestHeaders);
if (requestHeader.Value != null)
{
_logger.LogTrace("Request header '{HeaderName}' found with correlation id '{CorrelationId}'.", requestHeader.Key, requestHeader.Value);
}
string?responseHeaderName = _options.IncludeInResponse ? requestHeader.Key : null;
var correlatedHttpRequest = new HttpRequestActivity(_logger, httpContext, responseHeaderName);
return(_asyncCorrelationManager.CorrelateAsync(
requestHeader.Value,
() =>
{
correlatedHttpRequest.Start(_correlationContextAccessor.CorrelationContext);
return _next(httpContext)
.ContinueWith(t =>
{
correlatedHttpRequest.Stop();
return t;
}, TaskScheduler.Current)
.Unwrap();
}));
}
/// <summary>
/// Executes the <paramref name="correlatedTask"/> with its own <see cref="CorrelationContext"/>.
/// </summary>
/// <typeparam name="T">The return type of the awaitable task.</typeparam>
/// <param name="asyncCorrelationManager">The async correlation manager.</param>
/// <param name="correlatedTask">The task to execute.</param>
/// <param name="onException">A delegate to handle the exception inside the correlation scope, before it is disposed. Returns <see langword="true" /> to consider the exception handled, or <see langword="false" /> to throw.</param>
/// <returns>An awaitable that completes with a result <typeparamref name="T"/> once the <paramref name="correlatedTask"/> has executed and the correlation context has disposed.</returns>
/// <remarks>
/// When logging and tracing are both disabled, no correlation context is created and the task simply executed as it normally would.
/// </remarks>
public static Task <T> CorrelateAsync <T>(this IAsyncCorrelationManager asyncCorrelationManager, Func <Task <T> > correlatedTask, OnException <T>?onException)
{
if (asyncCorrelationManager is null)
{
throw new ArgumentNullException(nameof(asyncCorrelationManager));
}
return(asyncCorrelationManager.CorrelateAsync(null, correlatedTask, onException));
}
/// <summary>
/// Executes the <paramref name="correlatedTask"/> with its own <see cref="CorrelationContext"/>.
/// </summary>
/// <param name="asyncCorrelationManager">The async correlation manager.</param>
/// <param name="correlationId">The correlation id to use, or null to generate a new one.</param>
/// <param name="correlatedTask">The task to execute.</param>
/// <returns>An awaitable that completes once the <paramref name="correlatedTask"/> has executed and the correlation context has disposed.</returns>
/// <remarks>
/// When logging and tracing are both disabled, no correlation context is created and the task simply executed as it normally would.
/// </remarks>
public static Task CorrelateAsync(this IAsyncCorrelationManager asyncCorrelationManager, string?correlationId, Func <Task> correlatedTask)
{
if (asyncCorrelationManager is null)
{
throw new ArgumentNullException(nameof(asyncCorrelationManager));
}
return(asyncCorrelationManager.CorrelateAsync(correlationId, correlatedTask, null));
}
public Task Process(IncomingStepContext context, Func <Task> next)
{
Message message = context.Load <Message>();
message.Headers.TryGetValue(Headers.CorrelationId, out string?correlationId);
if (correlationId != null)
{
_logger.Debug("Correlation ID: {CorrelationId}", correlationId);
}
// If id is null, we just let manager assign new one.
return(_asyncCorrelationManager.CorrelateAsync(correlationId, next));
}
/// <summary>
/// Executes the <paramref name="correlatedTask"/> with its own <see cref="CorrelationContext"/>.
/// </summary>
/// <typeparam name="T">The return type of the awaitable task.</typeparam>
/// <param name="asyncCorrelationManager">The async correlation manager.</param>
/// <param name="correlationId">The correlation id to use, or null to generate a new one.</param>
/// <param name="correlatedTask">The task to execute.</param>
/// <returns>An awaitable that completes with a result <typeparamref name="T"/> once the <paramref name="correlatedTask"/> has executed and the correlation context has disposed.</returns>
/// <remarks>
/// When logging and tracing are both disabled, no correlation context is created and the task simply executed as it normally would.
/// </remarks>
public static Task <T> CorrelateAsync <T>(this IAsyncCorrelationManager asyncCorrelationManager, string correlationId, Func <Task <T> > correlatedTask)
{
return(asyncCorrelationManager.CorrelateAsync(correlationId, correlatedTask, null));
}
/// <summary>
/// Executes the <paramref name="correlatedTask"/> with its own <see cref="CorrelationContext"/>.
/// </summary>
/// <typeparam name="T">The return type of the awaitable task.</typeparam>
/// <param name="asyncCorrelationManager">The async correlation manager.</param>
/// <param name="correlatedTask">The task to execute.</param>
/// <param name="onException">A delegate to handle the exception inside the correlation scope, before it is disposed. Returns <see langword="true" /> to consider the exception handled, or <see langword="false" /> to throw.</param>
/// <returns>An awaitable that completes with a result <typeparamref name="T"/> once the <paramref name="correlatedTask"/> has executed and the correlation context has disposed.</returns>
/// <remarks>
/// When logging and tracing are both disabled, no correlation context is created and the task simply executed as it normally would.
/// </remarks>
public static Task <T> CorrelateAsync <T>(this IAsyncCorrelationManager asyncCorrelationManager, Func <Task <T> > correlatedTask, OnException <T> onException)
{
return(asyncCorrelationManager.CorrelateAsync(null, correlatedTask, onException));
}
/// <summary>
/// Executes the <paramref name="correlatedTask"/> with its own <see cref="CorrelationContext"/>.
/// </summary>
/// <typeparam name="T">The return type of the awaitable task.</typeparam>
/// <param name="asyncCorrelationManager">The async correlation manager.</param>
/// <param name="correlatedTask">The task to execute.</param>
/// <returns>An awaitable that completes with a result <typeparamref name="T"/> once the <paramref name="correlatedTask"/> has executed and the correlation context has disposed.</returns>
/// <remarks>
/// When logging and tracing are both disabled, no correlation context is created and the task simply executed as it normally would.
/// </remarks>
public static Task <T> CorrelateAsync <T>(this IAsyncCorrelationManager asyncCorrelationManager, Func <Task <T> > correlatedTask)
{
return(asyncCorrelationManager.CorrelateAsync(null, correlatedTask));
}
