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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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110 lines
3.1 KiB
110 lines
3.1 KiB
2 years ago
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/*
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*
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* Copyright 2023 gRPC authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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#include <condition_variable>
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#include <iostream>
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#include <memory>
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#include <mutex>
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#include <string>
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#include "absl/flags/flag.h"
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#include "absl/flags/parse.h"
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#include <grpcpp/grpcpp.h>
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#ifdef BAZEL_BUILD
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#include "examples/protos/helloworld.grpc.pb.h"
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#else
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#include "helloworld.grpc.pb.h"
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#endif
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ABSL_FLAG(std::string, target, "xds:///helloworld:50051", "Target string");
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ABSL_FLAG(bool, secure, true, "Secure mode");
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using grpc::Channel;
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using grpc::ClientContext;
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using grpc::Status;
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using helloworld::Greeter;
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using helloworld::HelloReply;
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using helloworld::HelloRequest;
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class GreeterClient {
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public:
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GreeterClient(std::shared_ptr<Channel> channel)
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: stub_(Greeter::NewStub(channel)) {}
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// Assembles the client's payload, sends it and presents the response back
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// from the server.
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std::string SayHello(const std::string& user) {
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// Data we are sending to the server.
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HelloRequest request;
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request.set_name(user);
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// Container for the data we expect from the server.
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HelloReply reply;
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// Context for the client. It could be used to convey extra information to
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// the server and/or tweak certain RPC behaviors.
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ClientContext context;
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// The actual RPC.
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std::mutex mu;
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std::condition_variable cv;
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bool done = false;
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Status status;
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stub_->async()->SayHello(&context, &request, &reply,
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[&mu, &cv, &done, &status](Status s) {
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status = std::move(s);
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std::lock_guard<std::mutex> lock(mu);
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done = true;
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cv.notify_one();
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});
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std::unique_lock<std::mutex> lock(mu);
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while (!done) {
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cv.wait(lock);
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}
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// Act upon its status.
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if (status.ok()) {
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return reply.message();
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} else {
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std::cout << status.error_code() << ": " << status.error_message()
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<< std::endl;
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return "RPC failed";
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}
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}
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private:
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std::unique_ptr<Greeter::Stub> stub_;
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};
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int main(int argc, char** argv) {
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absl::ParseCommandLine(argc, argv);
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GreeterClient greeter(grpc::CreateChannel(
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absl::GetFlag(FLAGS_target),
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absl::GetFlag(FLAGS_secure)
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? grpc::XdsCredentials(grpc::InsecureChannelCredentials())
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: grpc::InsecureChannelCredentials()));
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std::string user("world");
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std::string reply = greeter.SayHello(user);
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std::cout << "Greeter received: " << reply << std::endl;
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return 0;
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}
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