1 // Copyright 2023 gRPC authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <condition_variable>
16 #include <iostream>
17 #include <memory>
18 #include <mutex>
19 #include <string>
20 #include <vector>
21
22 #include "absl/flags/flag.h"
23 #include "absl/flags/parse.h"
24 #include "absl/strings/str_cat.h"
25
26 #include <grpcpp/grpcpp.h>
27
28 #ifdef BAZEL_BUILD
29 #include "examples/protos/helloworld.grpc.pb.h"
30 #else
31 #include "helloworld.grpc.pb.h"
32 #endif
33
34 ABSL_FLAG(std::string, target, "localhost:50051", "Server address");
35
36 using grpc::Channel;
37 using grpc::ClientContext;
38 using grpc::Status;
39 using grpc::StatusCode;
40 using helloworld::Greeter;
41 using helloworld::HelloReply;
42 using helloworld::HelloRequest;
43
unaryCall(std::shared_ptr<Channel> channel,std::string label,std::string message,grpc::StatusCode expected_code)44 void unaryCall(std::shared_ptr<Channel> channel, std::string label,
45 std::string message, grpc::StatusCode expected_code) {
46 std::unique_ptr<Greeter::Stub> stub = Greeter::NewStub(channel);
47
48 // Data we are sending to the server.
49 HelloRequest request;
50 request.set_name(message);
51
52 // Container for the data we expect from the server.
53 HelloReply reply;
54
55 // Context for the client. It could be used to convey extra information to
56 // the server and/or tweak certain RPC behaviors.
57 ClientContext context;
58
59 // Set 1 second timeout
60 context.set_deadline(std::chrono::system_clock::now() +
61 std::chrono::seconds(1));
62
63 // The actual RPC.
64 std::mutex mu;
65 std::condition_variable cv;
66 bool done = false;
67 Status status;
68 stub->async()->SayHello(&context, &request, &reply,
69 [&mu, &cv, &done, &status](Status s) {
70 status = std::move(s);
71 std::lock_guard<std::mutex> lock(mu);
72 done = true;
73 cv.notify_one();
74 });
75
76 std::unique_lock<std::mutex> lock(mu);
77 while (!done) {
78 cv.wait(lock);
79 }
80
81 // Act upon its status.
82 std::cout << "[" << label << "] wanted = " << expected_code
83 << ", got = " << status.error_code() << std::endl;
84 }
85
main(int argc,char ** argv)86 int main(int argc, char** argv) {
87 absl::ParseCommandLine(argc, argv);
88 // Instantiate the client. It requires a channel, out of which the actual RPCs
89 // are created. This channel models a connection to an endpoint specified by
90 // the argument "--target=" which is the only expected argument.
91 std::string target_str = absl::GetFlag(FLAGS_target);
92 // We indicate that the channel isn't authenticated (use of
93 // InsecureChannelCredentials()).
94 std::shared_ptr<Channel> channel =
95 grpc::CreateChannel(target_str, grpc::InsecureChannelCredentials());
96 // Making test calls
97 unaryCall(channel, "Successful request", "world", grpc::StatusCode::OK);
98 unaryCall(channel, "Exceeds deadline", "delay",
99 grpc::StatusCode::DEADLINE_EXCEEDED);
100 unaryCall(channel, "Successful request with propagated deadline",
101 "[propagate me]world", grpc::StatusCode::OK);
102 unaryCall(channel, "Exceeds propagated deadline",
103 "[propagate me][propagate me]world",
104 grpc::StatusCode::DEADLINE_EXCEEDED);
105 return 0;
106 }
107