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MiddlewareBase.cs
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MiddlewareBase.cs
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using System.Net;
using System.Runtime.CompilerServices;
using Microsoft.AspNetCore.Http;
using HotChocolate.AspNetCore.Instrumentation;
using HotChocolate.AspNetCore.Serialization;
using HotChocolate.Language;
using HotChocolate.Utilities;
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 IHttpResponseFormatter _responseFormatter;
private bool _disposed;
private readonly RequestExecutorProxy _executorProxy;
protected MiddlewareBase(
RequestDelegate next,
IRequestExecutorResolver executorResolver,
IHttpResponseFormatter responseFormatter,
string schemaName)
{
if (executorResolver is null)
{
throw new ArgumentNullException(nameof(executorResolver));
}
_next = next ??
throw new ArgumentNullException(nameof(next));
_responseFormatter = responseFormatter ??
throw new ArgumentNullException(nameof(responseFormatter));
SchemaName = schemaName;
IsDefaultSchema = SchemaName.EqualsOrdinal(Schema.DefaultName);
_executorProxy = new RequestExecutorProxy(executorResolver, schemaName);
}
/// <summary>
/// Gets the name of the schema that this middleware serves up.
/// </summary>
protected string 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 => _executorProxy;
/// <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 ValueTask<ISchema> GetSchemaAsync(CancellationToken cancellationToken)
=> _executorProxy.GetSchemaAsync(cancellationToken);
protected ValueTask WriteResultAsync(
HttpContext context,
IExecutionResult result,
AcceptMediaType[] acceptMediaTypes,
HttpStatusCode? statusCode = null)
=> _responseFormatter.FormatAsync(
context.Response,
result,
acceptMediaTypes,
statusCode,
context.RequestAborted);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
protected GraphQLRequestFlags CreateRequestFlags(AcceptMediaType[] acceptMediaTypes)
=> _responseFormatter.CreateRequestFlags(acceptMediaTypes);
protected static async Task<IExecutionResult> ExecuteSingleAsync(
HttpContext context,
IRequestExecutor requestExecutor,
IHttpRequestInterceptor requestInterceptor,
IServerDiagnosticEvents diagnosticEvents,
GraphQLRequest request,
GraphQLRequestFlags flags)
{
diagnosticEvents.StartSingleRequest(context, request);
var requestBuilder = QueryRequestBuilder.From(request);
requestBuilder.SetFlags(flags);
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,
GraphQLRequestFlags flags,
IReadOnlyList<string> operationNames)
{
diagnosticEvents.StartOperationBatchRequest(context, request, operationNames);
var requestBatch = new IQueryRequest[operationNames.Count];
for (var i = 0; i < operationNames.Count; i++)
{
var requestBuilder = QueryRequestBuilder.From(request);
requestBuilder.SetOperation(operationNames[i]);
requestBuilder.SetFlags(flags);
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,
GraphQLRequestFlags flags)
{
diagnosticEvents.StartBatchRequest(context, requests);
var requestBatch = new IQueryRequest[requests.Count];
for (var i = 0; i < requests.Count; i++)
{
var requestBuilder = QueryRequestBuilder.From(requests[i]);
requestBuilder.SetFlags(flags);
await requestInterceptor.OnCreateAsync(
context,
requestExecutor,
requestBuilder,
context.RequestAborted);
requestBatch[i] = requestBuilder.Create();
}
return await requestExecutor.ExecuteBatchAsync(
requestBatch,
cancellationToken: context.RequestAborted);
}
protected static RequestContentType ParseContentType(HttpContext context)
{
if (context.Items.TryGetValue(nameof(RequestContentType), out var value) &&
value is RequestContentType contentType)
{
return contentType;
}
var span = context.Request.ContentType.AsSpan();
if (span.StartsWith(ContentType.JsonSpan()))
{
context.Items[nameof(RequestContentType)] = RequestContentType.Json;
return RequestContentType.Json;
}
if (span.StartsWith(ContentType.MultiPartFormSpan()))
{
context.Items[nameof(RequestContentType)] = RequestContentType.Form;
return RequestContentType.Form;
}
context.Items[nameof(RequestContentType)] = RequestContentType.None;
return RequestContentType.None;
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!_disposed && disposing)
{
ExecutorProxy.Dispose();
_disposed = true;
}
}
}