-
-
Notifications
You must be signed in to change notification settings - Fork 725
/
OperationExecutionMiddleware.cs
206 lines (185 loc) · 7.32 KB
/
OperationExecutionMiddleware.cs
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
using System;
using System.Threading.Tasks;
using Microsoft.Extensions.ObjectPool;
using HotChocolate.Execution.Instrumentation;
using HotChocolate.Execution.Processing;
using HotChocolate.Fetching;
using HotChocolate.Language;
using static HotChocolate.Execution.ThrowHelper;
namespace HotChocolate.Execution.Pipeline
{
internal sealed class OperationExecutionMiddleware
{
private readonly RequestDelegate _next;
private readonly IDiagnosticEvents _diagnosticEvents;
private readonly ObjectPool<OperationContext> _operationContextPool;
private readonly QueryExecutor _queryExecutor;
private readonly MutationExecutor _mutationExecutor;
private readonly SubscriptionExecutor _subscriptionExecutor;
private object? _cachedQueryValue;
private object? _cachedMutation;
public OperationExecutionMiddleware(
RequestDelegate next,
IDiagnosticEvents diagnosticEvents,
ObjectPool<OperationContext> operationContextPool,
QueryExecutor queryExecutor,
MutationExecutor mutationExecutor,
SubscriptionExecutor subscriptionExecutor)
{
_next = next ??
throw new ArgumentNullException(nameof(next));
_diagnosticEvents = diagnosticEvents ??
throw new ArgumentNullException(nameof(diagnosticEvents));
_operationContextPool = operationContextPool ??
throw new ArgumentNullException(nameof(operationContextPool));
_queryExecutor = queryExecutor ??
throw new ArgumentNullException(nameof(queryExecutor));
_mutationExecutor = mutationExecutor ??
throw new ArgumentNullException(nameof(mutationExecutor));
_subscriptionExecutor = subscriptionExecutor ??
throw new ArgumentNullException(nameof(subscriptionExecutor));
}
public async ValueTask InvokeAsync(
IRequestContext context,
IBatchDispatcher? batchDispatcher)
{
if (batchDispatcher is null)
{
throw OperationExecutionMiddleware_NoBatchDispatcher();
}
if (context is { Operation: not null, Variables: not null })
{
if (IsOperationAllowed(context))
{
await ExecuteOperationAsync(
context, batchDispatcher, context.Operation)
.ConfigureAwait(false);
}
else
{
context.Result = ErrorHelper.OperationKindNotAllowed();
}
}
else
{
context.Result = ErrorHelper.StateInvalidForOperationExecution();
}
}
private async Task ExecuteOperationAsync(
IRequestContext context,
IBatchDispatcher batchDispatcher,
IPreparedOperation operation)
{
if (operation.Definition.Operation == OperationType.Subscription)
{
context.Result = await _subscriptionExecutor
.ExecuteAsync(context)
.ConfigureAwait(false);
await _next(context).ConfigureAwait(false);
}
else
{
OperationContext? operationContext = _operationContextPool.Get();
try
{
IQueryResult? result = await ExecuteQueryOrMutationAsync(
context, batchDispatcher, operation, operationContext)
.ConfigureAwait(false);
if (operationContext.Execution.DeferredTaskBacklog.IsEmpty ||
result is null)
{
context.Result = result;
}
else
{
// if we have deferred query task we will take ownership
// of the life time handling and return the operation context
// once we handled all deferred tasks.
var operationContextOwner = new OperationContextOwner(
operationContext, _operationContextPool);
operationContext = null;
context.Result = new DeferredQueryResult
(
result,
new DeferredTaskExecutor(operationContextOwner),
session: operationContextOwner
);
}
await _next(context).ConfigureAwait(false);
}
finally
{
if (operationContext is not null)
{
_operationContextPool.Return(operationContext);
}
}
}
}
private async Task<IQueryResult?> ExecuteQueryOrMutationAsync(
IRequestContext context,
IBatchDispatcher batchDispatcher,
IPreparedOperation operation,
OperationContext operationContext)
{
IQueryResult? result = null;
if (operation.Definition.Operation == OperationType.Query)
{
object? query = RootValueResolver.Resolve(
context,
context.Services,
operation.RootType,
ref _cachedQueryValue);
operationContext.Initialize(
context,
context.Services,
batchDispatcher,
operation,
query,
context.Variables!);
result = await _queryExecutor
.ExecuteAsync(operationContext)
.ConfigureAwait(false);
}
else if (operation.Definition.Operation == OperationType.Mutation)
{
object? mutation = RootValueResolver.Resolve(
context,
context.Services,
operation.RootType,
ref _cachedMutation);
operationContext.Initialize(
context,
context.Services,
batchDispatcher,
operation,
mutation,
context.Variables!);
result = await _mutationExecutor
.ExecuteAsync(operationContext)
.ConfigureAwait(false);
}
return result;
}
private bool IsOperationAllowed(IRequestContext context)
{
if (context.Request.AllowedOperations is null or { Length: 0 })
{
return true;
}
if (context.Request.AllowedOperations is { Length: 1 } allowed &&
allowed[0] == context.Operation?.Type)
{
return true;
}
for (var i = 0; i < context.Request.AllowedOperations.Length; i++)
{
if (context.Request.AllowedOperations[i] == context.Operation?.Type)
{
return true;
}
}
return false;
}
}
}