public override Task BatchRequestPreparationAsync(BatchRequestPreparationContext context,
CancellationToken cancellationToken = default)
{
BatchRequestPreparationCount += 1;
Assert.Equal(_state, context.State);
return(base.BatchRequestPreparationAsync(context, cancellationToken));
}
private async Task InvokeBatchAsync(HttpContext httpContext)
{
if (!httpContext.Request.IsMultiPartBatchRequest())
{
httpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
await httpContext.Response.WriteAsync("Invalid Content-Type.").ConfigureAwait(false);
return;
}
var boundary = httpContext.Request.GetMultipartBoundary();
if (string.IsNullOrEmpty(boundary))
{
httpContext.Response.StatusCode = StatusCodes.Status400BadRequest;
await httpContext.Response.WriteAsync("Invalid boundary in Content-Type.").ConfigureAwait(false);
return;
}
var startContext = new BatchStartContext
{
Request = httpContext.Request
};
var cancellationToken = httpContext.RequestAborted;
await _options.Events.BatchStartAsync(startContext, cancellationToken).ConfigureAwait(false);
Exception exception = null;
var abort = false;
var reader = new MultipartReader(boundary, httpContext.Request.Body);
// PathString.StartsWithSegments that we use requires the base path to not end in a slash.
var pathBase = httpContext.Request.PathBase;
if (pathBase.HasValue && pathBase.Value.EndsWith("/"))
{
pathBase = new PathString(pathBase.Value.Substring(0, pathBase.Value.Length - 1));
}
using (var writer = new MultipartWriter("batch", Guid.NewGuid().ToString()))
{
try
{
HttpApplicationRequestSection section;
while ((section = await reader
.ReadNextHttpApplicationRequestSectionAsync(pathBase, cancellationToken)
.ConfigureAwait(false)) != null)
{
httpContext.RequestAborted.ThrowIfCancellationRequested();
var preparationContext = new BatchRequestPreparationContext
{
RequestFeature = section.RequestFeature,
Features = CreateDefaultFeatures(httpContext.Features),
State = startContext.State
};
await _options.Events.BatchRequestPreparationAsync(preparationContext, cancellationToken)
.ConfigureAwait(false);
using (var state =
new RequestState(section.RequestFeature, _factory, preparationContext.Features))
{
using (httpContext.RequestAborted.Register(state.AbortRequest))
{
var executedContext = new BatchRequestExecutedContext
{
Request = state.Context.Request,
State = startContext.State
};
try
{
var executingContext = new BatchRequestExecutingContext
{
Request = state.Context.Request,
State = startContext.State
};
await _options.Events
.BatchRequestExecutingAsync(executingContext, cancellationToken)
.ConfigureAwait(false);
await _next.Invoke(state.Context).ConfigureAwait(false);
var response = await state.ResponseTaskAsync().ConfigureAwait(false);
executedContext.Response = state.Context.Response;
writer.Add(new HttpApplicationMultipart(response));
}
catch (Exception ex)
{
state.Abort(ex);
executedContext.Exception = ex;
}
finally
{
await _options.Events.BatchRequestExecutedAsync(executedContext, cancellationToken)
.ConfigureAwait(false);
abort = executedContext.Abort;
}
if (abort)
{
break;
}
}
}
}
}
catch (Exception ex)
{
exception = ex;
}
finally
{
var endContext = new BatchEndContext
{
Exception = exception,
State = startContext.State,
IsAborted = abort,
Response = httpContext.Response
};
if (endContext.Exception != null)
{
endContext.Response.StatusCode = StatusCodes.Status500InternalServerError;
}
await _options.Events.BatchEndAsync(endContext, cancellationToken).ConfigureAwait(false);
if (!endContext.IsHandled)
{
httpContext.Response.Headers.Add(HeaderNames.ContentType, writer.ContentType);
await writer.CopyToAsync(httpContext.Response.Body, cancellationToken).ConfigureAwait(false);
}
}
}
}