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
|
/**
* Copyright (C) 2018 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/util/future.h"
#include "mongo/stdx/thread.h"
#include "mongo/unittest/death_test.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/future_test_utils.h"
namespace mongo {
namespace {
// This is the motivating case for SharedStateBase::isJustForContinuation. Without that logic, there
// would be a long chain of SharedStates, growing longer with each recursion. That logic exists to
// limit it to a fixed-size chain.
TEST(Future_EdgeCases, looping_onError) {
int tries = 10;
std::function<Future<int>()> read = [&] {
return async([&] {
uassert(ErrorCodes::BadValue, "", --tries == 0);
return tries;
})
.onError([&](Status) { return read(); });
};
ASSERT_EQ(read().get(), 0);
}
// This tests for a bug in an earlier implementation of isJustForContinuation. Due to an off-by-one,
// it would replace the "then" continuation's SharedState. A different type is used for the return
// from then to cause it to fail a checked_cast close to the bug in debug builds.
TEST(Future_EdgeCases, looping_onError_with_then) {
int tries = 10;
std::function<Future<int>()> read = [&] {
return async([&] {
uassert(ErrorCodes::BadValue, "", --tries == 0);
return tries;
})
.onError([&](Status) { return read(); });
};
ASSERT_EQ(read().then([](int x) { return x + 0.5; }).get(), 0.5);
}
// Make sure we actually die if someone throws from the getAsync callback.
//
// With gcc 5.8 we terminate, but print "terminate() called. No exception is active". This works in
// clang and gcc 7, so hopefully we can change the death-test search string to "die die die!!!" when
// we upgrade the toolchain.
DEATH_TEST(Future_EdgeCases, Success_getAsync_throw, "terminate() called") {
Future<void>::makeReady().getAsync(
[](Status) { uasserted(ErrorCodes::BadValue, "die die die!!!"); });
}
} // namespace
} // namespace mongo
|