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MiddlewareBase.cs
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MiddlewareBase.cs
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using System.Net;
using Microsoft.AspNetCore.Http;
using HotChocolate.AspNetCore.Instrumentation;
using HotChocolate.AspNetCore.Serialization;
using HotChocolate.Language;
using RequestDelegate = Microsoft.AspNetCore.Http.RequestDelegate;
namespace HotChocolate.AspNetCore;
/// <summary>
/// The Hot Chocolate ASP.NET core middleware base class.
/// </summary>
public class MiddlewareBase : IDisposable
{
private readonly RequestDelegate _next;
private readonly IHttpResultSerializer _resultSerializer;
private bool? _batching = null;
private bool _disposed;
protected MiddlewareBase(
RequestDelegate next,
IRequestExecutorResolver executorResolver,
IHttpResultSerializer resultSerializer,
NameString schemaName)
{
if (executorResolver == null)
{
throw new ArgumentNullException(nameof(executorResolver));
}
_next = next ??
throw new ArgumentNullException(nameof(next));
_resultSerializer = resultSerializer ??
throw new ArgumentNullException(nameof(resultSerializer));
SchemaName = schemaName;
IsDefaultSchema = SchemaName.Equals(Schema.DefaultName);
ExecutorProxy = new RequestExecutorProxy(executorResolver, schemaName);
}
/// <summary>
/// Gets the name of the schema that this middleware serves up.
/// </summary>
protected NameString SchemaName { get; }
/// <summary>
/// Specifies if this middleware handles the default schema.
/// </summary>
protected bool IsDefaultSchema { get; }
/// <summary>
/// Gets the request executor proxy.
/// </summary>
protected RequestExecutorProxy ExecutorProxy { get; }
/// <summary>
/// Invokes the next middleware in line.
/// </summary>
/// <param name="context">
/// The <see cref="HttpContext"/>.
/// </param>
protected Task NextAsync(HttpContext context) => _next(context);
/// <summary>
/// Gets the request executor for this middleware.
/// </summary>
/// <param name="cancellationToken">
/// The cancellation token.
/// </param>
/// <returns>
/// Returns the request executor for this middleware.
/// </returns>
protected ValueTask<IRequestExecutor> GetExecutorAsync(CancellationToken cancellationToken)
=> ExecutorProxy.GetRequestExecutorAsync(cancellationToken);
/// <summary>
/// Gets the schema for this middleware.
/// </summary>
/// <param name="cancellationToken">
/// The cancellation token.
/// </param>
/// <returns>
/// Returns the schema for this middleware.
/// </returns>
protected async ValueTask<ISchema> GetSchemaAsync(CancellationToken cancellationToken)
{
IRequestExecutor requestExecutor = await GetExecutorAsync(cancellationToken);
return requestExecutor.Schema;
}
protected ValueTask WriteResultAsync(
HttpContext context,
IExecutionResult result,
HttpStatusCode? statusCode = null)
=> WriteResultAsync(context.Response, result, statusCode, context.RequestAborted);
protected async ValueTask WriteResultAsync(
HttpResponse response,
IExecutionResult result,
HttpStatusCode? statusCode,
CancellationToken cancellationToken)
{
response.ContentType = _resultSerializer.GetContentType(result);
response.StatusCode = (int)(statusCode ?? _resultSerializer.GetStatusCode(result));
await _resultSerializer.SerializeAsync(result, response.Body, cancellationToken);
}
protected static async Task<IExecutionResult> ExecuteSingleAsync(
HttpContext context,
IRequestExecutor requestExecutor,
IHttpRequestInterceptor requestInterceptor,
IServerDiagnosticEvents diagnosticEvents,
GraphQLRequest request,
OperationType[]? allowedOperations = null)
{
diagnosticEvents.StartSingleRequest(context, request);
var requestBuilder = QueryRequestBuilder.From(request);
requestBuilder.SetAllowedOperations(allowedOperations);
await requestInterceptor.OnCreateAsync(
context, requestExecutor, requestBuilder, context.RequestAborted);
return await requestExecutor.ExecuteAsync(
requestBuilder.Create(), context.RequestAborted);
}
protected static async Task<IResponseStream> ExecuteOperationBatchAsync(
HttpContext context,
IRequestExecutor requestExecutor,
IHttpRequestInterceptor requestInterceptor,
IServerDiagnosticEvents diagnosticEvents,
GraphQLRequest request,
IReadOnlyList<string> operationNames)
{
diagnosticEvents.StartOperationBatchRequest(context, request, operationNames);
var requestBatch = new IReadOnlyQueryRequest[operationNames.Count];
for (var i = 0; i < operationNames.Count; i++)
{
var requestBuilder = QueryRequestBuilder.From(request);
requestBuilder.SetOperation(operationNames[i]);
await requestInterceptor.OnCreateAsync(
context,
requestExecutor,
requestBuilder,
context.RequestAborted);
requestBatch[i] = requestBuilder.Create();
}
return await requestExecutor.ExecuteBatchAsync(
requestBatch,
cancellationToken: context.RequestAborted);
}
protected static async Task<IResponseStream> ExecuteBatchAsync(
HttpContext context,
IRequestExecutor requestExecutor,
IHttpRequestInterceptor requestInterceptor,
IServerDiagnosticEvents diagnosticEvents,
IReadOnlyList<GraphQLRequest> requests)
{
diagnosticEvents.StartBatchRequest(context, requests);
var requestBatch = new IReadOnlyQueryRequest[requests.Count];
for (var i = 0; i < requests.Count; i++)
{
var requestBuilder = QueryRequestBuilder.From(requests[i]);
await requestInterceptor.OnCreateAsync(
context, requestExecutor, requestBuilder, context.RequestAborted);
requestBatch[i] = requestBuilder.Create();
}
return await requestExecutor.ExecuteBatchAsync(
requestBatch,
cancellationToken: context.RequestAborted);
}
protected static AllowedContentType ParseContentType(HttpContext context)
{
if (context.Items.TryGetValue(nameof(AllowedContentType), out var value) &&
value is AllowedContentType contentType)
{
return contentType;
}
ReadOnlySpan<char> span = context.Request.ContentType.AsSpan();
for (var i = 0; i < span.Length; i++)
{
if (span[i] == ';')
{
span = span[..i];
break;
}
}
if (span.SequenceEqual(ContentType.JsonSpan()))
{
context.Items[nameof(AllowedContentType)] = AllowedContentType.Json;
return AllowedContentType.Json;
}
if (span.SequenceEqual(ContentType.MultiPartSpan()))
{
context.Items[nameof(AllowedContentType)] = AllowedContentType.Form;
return AllowedContentType.Form;
}
context.Items[nameof(AllowedContentType)] = AllowedContentType.None;
return AllowedContentType.None;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!_disposed && disposing)
{
ExecutorProxy.Dispose();
_disposed = true;
}
}
}