mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
105 lines
3.0 KiB
105 lines
3.0 KiB
3 years ago
|
/*
|
||
|
|
*
|
||
|
|
* Copyright 2022 The gRPC authors.
|
||
|
|
*
|
||
|
|
* 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 <iostream>
|
||
|
|
#include <memory>
|
||
|
|
#include <string>
|
||
|
|
|
||
|
|
#include <grpcpp/grpcpp.h>
|
||
|
|
|
||
|
|
#include "protos/helloworld.grpc.pb.h"
|
||
|
|
|
||
|
|
using grpc::Channel;
|
||
|
|
using grpc::ClientContext;
|
||
|
|
using grpc::Status;
|
||
|
|
using helloworld::Greeter;
|
||
|
|
using helloworld::HelloReply;
|
||
|
|
using helloworld::HelloRequest;
|
||
|
|
|
||
|
|
class GreeterClient {
|
||
|
|
public:
|
||
|
|
GreeterClient(std::shared_ptr<Channel> channel)
|
||
|
|
: stub_(Greeter::NewStub(channel)) {}
|
||
|
|
|
||
|
|
// Assembles the client's payload, sends it and presents the response back
|
||
|
|
// from the server.
|
||
|
|
std::string SayHello(const std::string& user) {
|
||
|
|
// Data we are sending to the server.
|
||
|
|
HelloRequest request;
|
||
|
|
request.set_name(user);
|
||
|
|
|
||
|
|
// Container for the data we expect from the server.
|
||
|
|
HelloReply reply;
|
||
|
|
|
||
|
|
// Context for the client. It could be used to convey extra information to
|
||
|
|
// the server and/or tweak certain RPC behaviors.
|
||
|
|
ClientContext context;
|
||
|
|
|
||
|
|
// The actual RPC.
|
||
|
|
Status status = stub_->SayHello(&context, request, &reply);
|
||
|
|
|
||
|
|
// Act upon its status.
|
||
|
|
if (status.ok()) {
|
||
|
|
return reply.message();
|
||
|
|
} else {
|
||
|
|
std::cout << status.error_code() << ": " << status.error_message()
|
||
|
|
<< std::endl;
|
||
|
|
return "RPC failed";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
std::unique_ptr<Greeter::Stub> stub_;
|
||
|
|
};
|
||
|
|
|
||
|
|
int main(int argc, char** argv) {
|
||
|
|
// Instantiate the client. It requires a channel, out of which the actual RPCs
|
||
|
|
// are created. This channel models a connection to an endpoint specified by
|
||
|
|
// the argument "--target=" which is the only expected argument.
|
||
|
|
// We indicate that the channel isn't authenticated (use of
|
||
|
|
// InsecureChannelCredentials()).
|
||
|
|
std::string target_str;
|
||
|
|
std::string arg_str("--target");
|
||
|
|
if (argc > 1) {
|
||
|
|
std::string arg_val = argv[1];
|
||
|
|
size_t start_pos = arg_val.find(arg_str);
|
||
|
|
if (start_pos != std::string::npos) {
|
||
|
|
start_pos += arg_str.size();
|
||
|
|
if (arg_val[start_pos] == '=') {
|
||
|
|
target_str = arg_val.substr(start_pos + 1);
|
||
|
|
} else {
|
||
|
|
std::cout << "The only correct argument syntax is --target="
|
||
|
|
<< std::endl;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
std::cout << "The only acceptable argument is --target=" << std::endl;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
target_str = "localhost:50051";
|
||
|
|
}
|
||
|
|
GreeterClient greeter(
|
||
|
|
grpc::CreateChannel(target_str, grpc::InsecureChannelCredentials()));
|
||
|
|
std::string user("world");
|
||
|
|
std::string reply = greeter.SayHello(user);
|
||
|
|
std::cout << "Greeter received: " << reply << std::endl;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
}
|