8651b2ed3db95bf3335a1065302ad09c499f8fe8
[platform/upstream/grpc.git] / test / core / end2end / fuzzers / server_fuzzer.cc
1 /*
2  *
3  * Copyright 2016 gRPC authors.
4  *
5  * Licensed under the Apache License, Version 2.0 (the "License");
6  * you may not use this file except in compliance with the License.
7  * You may obtain a copy of the License at
8  *
9  *     http://www.apache.org/licenses/LICENSE-2.0
10  *
11  * Unless required by applicable law or agreed to in writing, software
12  * distributed under the License is distributed on an "AS IS" BASIS,
13  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14  * See the License for the specific language governing permissions and
15  * limitations under the License.
16  *
17  */
18
19 #include <grpc/grpc.h>
20
21 #include "src/core/ext/transport/chttp2/transport/chttp2_transport.h"
22 #include "src/core/lib/iomgr/executor.h"
23 #include "src/core/lib/slice/slice_internal.h"
24 #include "src/core/lib/surface/server.h"
25 #include "test/core/util/mock_endpoint.h"
26
27 bool squelch = true;
28 bool leak_check = true;
29
30 static void discard_write(grpc_slice /*slice*/) {}
31
32 static void* tag(intptr_t t) { return reinterpret_cast<void*>(t); }
33
34 static void dont_log(gpr_log_func_args* /*args*/) {}
35
36 extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
37   grpc_test_only_set_slice_hash_seed(0);
38   if (squelch) gpr_set_log_function(dont_log);
39   grpc_init();
40   {
41     grpc_core::ExecCtx exec_ctx;
42     grpc_core::Executor::SetThreadingAll(false);
43
44     grpc_resource_quota* resource_quota =
45         grpc_resource_quota_create("server_fuzzer");
46     grpc_endpoint* mock_endpoint =
47         grpc_mock_endpoint_create(discard_write, resource_quota);
48     grpc_resource_quota_unref_internal(resource_quota);
49     grpc_mock_endpoint_put_read(
50         mock_endpoint, grpc_slice_from_copied_buffer((const char*)data, size));
51
52     grpc_server* server = grpc_server_create(nullptr, nullptr);
53     grpc_completion_queue* cq = grpc_completion_queue_create_for_next(nullptr);
54     grpc_server_register_completion_queue(server, cq, nullptr);
55     // TODO(ctiller): add more registered methods (one for POST, one for PUT)
56     grpc_server_register_method(server, "/reg", nullptr, {}, 0);
57     grpc_server_start(server);
58     grpc_transport* transport =
59         grpc_create_chttp2_transport(nullptr, mock_endpoint, false);
60     server->core_server->SetupTransport(transport, nullptr, nullptr, nullptr);
61     grpc_chttp2_transport_start_reading(transport, nullptr, nullptr, nullptr);
62
63     grpc_call* call1 = nullptr;
64     grpc_call_details call_details1;
65     grpc_metadata_array request_metadata1;
66     grpc_call_details_init(&call_details1);
67     grpc_metadata_array_init(&request_metadata1);
68     int requested_calls = 0;
69
70     GPR_ASSERT(GRPC_CALL_OK ==
71                grpc_server_request_call(server, &call1, &call_details1,
72                                         &request_metadata1, cq, cq, tag(1)));
73     requested_calls++;
74
75     grpc_event ev;
76     while (true) {
77       grpc_core::ExecCtx::Get()->Flush();
78       ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME),
79                                       nullptr);
80       switch (ev.type) {
81         case GRPC_QUEUE_TIMEOUT:
82           goto done;
83         case GRPC_QUEUE_SHUTDOWN:
84           break;
85         case GRPC_OP_COMPLETE:
86           if (ev.tag == tag(1)) {
87             requested_calls--;
88             // TODO(ctiller): keep reading that call!
89           }
90           break;
91       }
92     }
93
94   done:
95     if (call1 != nullptr) grpc_call_unref(call1);
96     grpc_call_details_destroy(&call_details1);
97     grpc_metadata_array_destroy(&request_metadata1);
98     grpc_server_shutdown_and_notify(server, cq, tag(0xdead));
99     grpc_server_cancel_all_calls(server);
100     grpc_millis deadline = grpc_core::ExecCtx::Get()->Now() + 5000;
101     for (int i = 0; i <= requested_calls; i++) {
102       // A single grpc_completion_queue_next might not be sufficient for getting
103       // the tag from shutdown, because we might potentially get blocked by
104       // an operation happening on the timer thread.
105       // For example, the deadline timer might expire, leading to the timer
106       // thread trying to cancel the RPC and thereby acquiring a few references
107       // to the call. This will prevent the shutdown to complete till the timer
108       // thread releases those references.
109       // As a solution, we are going to keep performing a cq_next for a
110       // liberal period of 5 seconds for the timer thread to complete its work.
111       do {
112         ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME),
113                                         nullptr);
114         grpc_core::ExecCtx::Get()->InvalidateNow();
115       } while (ev.type != GRPC_OP_COMPLETE &&
116                grpc_core::ExecCtx::Get()->Now() < deadline);
117       GPR_ASSERT(ev.type == GRPC_OP_COMPLETE);
118     }
119     grpc_completion_queue_shutdown(cq);
120     for (int i = 0; i <= requested_calls; i++) {
121       do {
122         ev = grpc_completion_queue_next(cq, gpr_inf_past(GPR_CLOCK_REALTIME),
123                                         nullptr);
124         grpc_core::ExecCtx::Get()->InvalidateNow();
125       } while (ev.type != GRPC_QUEUE_SHUTDOWN &&
126                grpc_core::ExecCtx::Get()->Now() < deadline);
127       GPR_ASSERT(ev.type == GRPC_QUEUE_SHUTDOWN);
128     }
129     grpc_server_destroy(server);
130     grpc_completion_queue_destroy(cq);
131   }
132   grpc_shutdown();
133   return 0;
134 }