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
|
#region Copyright notice and license
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#endregion
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Grpc.Core;
using Grpc.Core.Internal;
using Grpc.Core.Profiling;
using Grpc.Core.Utils;
using NUnit.Framework;
namespace Grpc.Core.Tests
{
public class CallCancellationTest
{
const string Host = "127.0.0.1";
MockServiceHelper helper;
Server server;
Channel channel;
[SetUp]
public void Init()
{
helper = new MockServiceHelper(Host);
server = helper.GetServer();
server.Start();
channel = helper.GetChannel();
}
[TearDown]
public void Cleanup()
{
channel.ShutdownAsync().Wait();
server.ShutdownAsync().Wait();
}
[Test]
public async Task ClientStreamingCall_CancelAfterBegin()
{
var barrier = new TaskCompletionSource<object>();
helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
{
barrier.SetResult(null);
await requestStream.ToListAsync();
return "";
});
var cts = new CancellationTokenSource();
var call = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall(new CallOptions(cancellationToken: cts.Token)));
await barrier.Task; // make sure the handler has started.
cts.Cancel();
try
{
// cannot use Assert.ThrowsAsync because it uses Task.Wait and would deadlock.
await call.ResponseAsync;
Assert.Fail();
}
catch (RpcException ex)
{
Assert.AreEqual(StatusCode.Cancelled, ex.Status.StatusCode);
}
}
[Test]
public async Task ClientStreamingCall_ServerSideReadAfterCancelNotificationReturnsNull()
{
var handlerStartedBarrier = new TaskCompletionSource<object>();
var cancelNotificationReceivedBarrier = new TaskCompletionSource<object>();
var successTcs = new TaskCompletionSource<string>();
helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
{
handlerStartedBarrier.SetResult(null);
// wait for cancellation to be delivered.
context.CancellationToken.Register(() => cancelNotificationReceivedBarrier.SetResult(null));
await cancelNotificationReceivedBarrier.Task;
var moveNextResult = await requestStream.MoveNext();
successTcs.SetResult(!moveNextResult ? "SUCCESS" : "FAIL");
return "";
});
var cts = new CancellationTokenSource();
var call = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall(new CallOptions(cancellationToken: cts.Token)));
await handlerStartedBarrier.Task;
cts.Cancel();
try
{
await call.ResponseAsync;
Assert.Fail();
}
catch (RpcException ex)
{
Assert.AreEqual(StatusCode.Cancelled, ex.Status.StatusCode);
}
Assert.AreEqual("SUCCESS", await successTcs.Task);
}
[Test]
public async Task ClientStreamingCall_CancelServerSideRead()
{
helper.ClientStreamingHandler = new ClientStreamingServerMethod<string, string>(async (requestStream, context) =>
{
var cts = new CancellationTokenSource();
var moveNextTask = requestStream.MoveNext(cts.Token);
cts.Cancel();
await moveNextTask;
return "";
});
var call = Calls.AsyncClientStreamingCall(helper.CreateClientStreamingCall());
try
{
// cannot use Assert.ThrowsAsync because it uses Task.Wait and would deadlock.
await call.ResponseAsync;
Assert.Fail();
}
catch (RpcException ex)
{
Assert.AreEqual(StatusCode.Cancelled, ex.Status.StatusCode);
}
}
[Test]
public async Task ServerStreamingCall_CancelClientSideRead()
{
helper.ServerStreamingHandler = new ServerStreamingServerMethod<string, string>(async (request, responseStream, context) =>
{
await responseStream.WriteAsync("abc");
while (!context.CancellationToken.IsCancellationRequested)
{
await Task.Delay(10);
}
});
var call = Calls.AsyncServerStreamingCall(helper.CreateServerStreamingCall(), "");
await call.ResponseStream.MoveNext();
Assert.AreEqual("abc", call.ResponseStream.Current);
var cts = new CancellationTokenSource();
var moveNextTask = call.ResponseStream.MoveNext(cts.Token);
cts.Cancel();
try
{
// cannot use Assert.ThrowsAsync because it uses Task.Wait and would deadlock.
await moveNextTask;
Assert.Fail();
}
catch (RpcException ex)
{
Assert.AreEqual(StatusCode.Cancelled, ex.Status.StatusCode);
}
}
}
}
|
