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
|
#include "greeter.grpc.fb.h"
#include "greeter_generated.h"
#include <grpcpp/grpcpp.h>
#include <iostream>
#include <memory>
#include <string>
class GreeterClient {
public:
GreeterClient(std::shared_ptr<grpc::Channel> channel)
: stub_(Greeter::NewStub(channel)) {}
std::string SayHello(const std::string &name) {
flatbuffers::grpc::MessageBuilder mb;
auto name_offset = mb.CreateString(name);
auto request_offset = CreateHelloRequest(mb, name_offset);
mb.Finish(request_offset);
auto request_msg = mb.ReleaseMessage<HelloRequest>();
flatbuffers::grpc::Message<HelloReply> response_msg;
grpc::ClientContext context;
auto status = stub_->SayHello(&context, request_msg, &response_msg);
if (status.ok()) {
const HelloReply *response = response_msg.GetRoot();
return response->message()->str();
} else {
std::cerr << status.error_code() << ": " << status.error_message()
<< std::endl;
return "RPC failed";
}
}
void SayManyHellos(const std::string &name, int num_greetings,
std::function<void(const std::string &)> callback) {
flatbuffers::grpc::MessageBuilder mb;
auto name_offset = mb.CreateString(name);
auto request_offset =
CreateManyHellosRequest(mb, name_offset, num_greetings);
mb.Finish(request_offset);
auto request_msg = mb.ReleaseMessage<ManyHellosRequest>();
flatbuffers::grpc::Message<HelloReply> response_msg;
grpc::ClientContext context;
auto stream = stub_->SayManyHellos(&context, request_msg);
while (stream->Read(&response_msg)) {
const HelloReply *response = response_msg.GetRoot();
callback(response->message()->str());
}
auto status = stream->Finish();
if (!status.ok()) {
std::cerr << status.error_code() << ": " << status.error_message()
<< std::endl;
callback("RPC failed");
}
}
private:
std::unique_ptr<Greeter::Stub> stub_;
};
int main(int argc, char **argv) {
std::string server_address("localhost:50051");
auto channel =
grpc::CreateChannel(server_address, grpc::InsecureChannelCredentials());
GreeterClient greeter(channel);
std::string name("world");
std::string message = greeter.SayHello(name);
std::cerr << "Greeter received: " << message << std::endl;
int num_greetings = 10;
greeter.SayManyHellos(name, num_greetings, [](const std::string &message) {
std::cerr << "Greeter received: " << message << std::endl;
});
return 0;
}
|
