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
|
/*
* Copyright 2014 Google Inc. All rights reserved.
*
* 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.
*/
#include <grpcpp/grpcpp.h>
#include <condition_variable>
#include <thread>
#include "monster_test.grpc.fb.h"
#include "monster_test_generated.h"
#include "test_assert.h"
using namespace MyGame::Example;
using flatbuffers::FlatBufferBuilder;
using flatbuffers::grpc::MessageBuilder;
void message_builder_tests();
// The callback implementation of our server, that derives from the generated
// code. It implements all rpcs specified in the FlatBuffers schema.
class ServiceImpl final : public MyGame::Example::MonsterStorage::Service {
virtual ::grpc::Status Store(
::grpc::ServerContext *context,
const flatbuffers::grpc::Message<Monster> *request,
flatbuffers::grpc::Message<Stat> *response) override {
// Create a response from the incoming request name.
fbb_.Clear();
auto stat_offset = CreateStat(
fbb_, fbb_.CreateString("Hello, " + request->GetRoot()->name()->str()));
fbb_.Finish(stat_offset);
// Transfer ownership of the message to gRPC
*response = fbb_.ReleaseMessage<Stat>();
return grpc::Status::OK;
}
virtual ::grpc::Status Retrieve(
::grpc::ServerContext *context,
const flatbuffers::grpc::Message<Stat> *request,
::grpc::ServerWriter<flatbuffers::grpc::Message<Monster>> *writer)
override {
for (int i = 0; i < 5; i++) {
fbb_.Clear();
// Create 5 monsters for resposne.
auto monster_offset =
CreateMonster(fbb_, 0, 0, 0,
fbb_.CreateString(request->GetRoot()->id()->str() +
" No." + std::to_string(i)));
fbb_.Finish(monster_offset);
flatbuffers::grpc::Message<Monster> monster =
fbb_.ReleaseMessage<Monster>();
// Send monster to client using streaming.
writer->Write(monster);
}
return grpc::Status::OK;
}
private:
flatbuffers::grpc::MessageBuilder fbb_;
};
// Track the server instance, so we can terminate it later.
grpc::Server *server_instance = nullptr;
// Mutex to protec this variable.
std::mutex wait_for_server;
std::condition_variable server_instance_cv;
// This function implements the server thread.
void RunServer() {
auto server_address = "0.0.0.0:50051";
// Callback interface we implemented above.
ServiceImpl service;
grpc::ServerBuilder builder;
builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
builder.RegisterService(&service);
// Start the server. Lock to change the variable we're changing.
wait_for_server.lock();
server_instance = builder.BuildAndStart().release();
wait_for_server.unlock();
server_instance_cv.notify_one();
std::cout << "Server listening on " << server_address << std::endl;
// This will block the thread and serve requests.
server_instance->Wait();
}
template<class Builder> void StoreRPC(MonsterStorage::Stub *stub) {
Builder fbb;
grpc::ClientContext context;
// Build a request with the name set.
auto monster_offset = CreateMonster(fbb, 0, 0, 0, fbb.CreateString("Fred"));
MessageBuilder mb(std::move(fbb));
mb.Finish(monster_offset);
auto request = mb.ReleaseMessage<Monster>();
flatbuffers::grpc::Message<Stat> response;
// The actual RPC.
auto status = stub->Store(&context, request, &response);
if (status.ok()) {
auto resp = response.GetRoot()->id();
std::cout << "RPC response: " << resp->str() << std::endl;
} else {
std::cout << "RPC failed" << std::endl;
}
}
template<class Builder> void RetrieveRPC(MonsterStorage::Stub *stub) {
Builder fbb;
grpc::ClientContext context;
fbb.Clear();
auto stat_offset = CreateStat(fbb, fbb.CreateString("Fred"));
fbb.Finish(stat_offset);
auto request = MessageBuilder(std::move(fbb)).ReleaseMessage<Stat>();
flatbuffers::grpc::Message<Monster> response;
auto stream = stub->Retrieve(&context, request);
while (stream->Read(&response)) {
auto resp = response.GetRoot()->name();
std::cout << "RPC Streaming response: " << resp->str() << std::endl;
}
}
int grpc_server_test() {
// Launch server.
std::thread server_thread(RunServer);
// wait for server to spin up.
std::unique_lock<std::mutex> lock(wait_for_server);
while (!server_instance) server_instance_cv.wait(lock);
// Now connect the client.
auto channel = grpc::CreateChannel("localhost:50051",
grpc::InsecureChannelCredentials());
auto stub = MyGame::Example::MonsterStorage::NewStub(channel);
StoreRPC<MessageBuilder>(stub.get());
StoreRPC<FlatBufferBuilder>(stub.get());
RetrieveRPC<MessageBuilder>(stub.get());
RetrieveRPC<FlatBufferBuilder>(stub.get());
#if !FLATBUFFERS_GRPC_DISABLE_AUTO_VERIFICATION
{
// Test that an invalid request errors out correctly
grpc::ClientContext context;
flatbuffers::grpc::Message<Monster> request; // simulate invalid message
flatbuffers::grpc::Message<Stat> response;
auto status = stub->Store(&context, request, &response);
// The rpc status should be INTERNAL to indicate a verification error. This
// matches the protobuf gRPC status code for an unparseable message.
assert(!status.ok());
assert(status.error_code() == ::grpc::StatusCode::INTERNAL);
assert(strcmp(status.error_message().c_str(),
"Message verification failed") == 0);
}
#endif
server_instance->Shutdown();
server_thread.join();
delete server_instance;
return 0;
}
int main(int /*argc*/, const char * /*argv*/[]) {
message_builder_tests();
grpc_server_test();
if (!testing_fails) {
TEST_OUTPUT_LINE("ALL TESTS PASSED");
return 0;
} else {
TEST_OUTPUT_LINE("%d FAILED TESTS", testing_fails);
return 1;
}
}
|
