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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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106 lines
3.4 KiB
106 lines
3.4 KiB
/* |
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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 <vector> |
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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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#include "examples/protos/route_guide.grpc.pb.h" |
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#else |
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#include "helloworld.grpc.pb.h" |
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#include "route_guide.grpc.pb.h" |
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#endif |
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ABSL_FLAG(std::string, target, "localhost:50051", "Server address"); |
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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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int main(int argc, char** argv) { |
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absl::ParseCommandLine(argc, argv); |
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// Instantiate the client. It requires a channel, out of which the actual RPCs |
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// are created. This channel models a connection to an endpoint specified by |
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// the argument "--target=" which is the only expected argument. |
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std::string target_str = absl::GetFlag(FLAGS_target); |
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// We indicate that the channel isn't authenticated (use of |
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// InsecureChannelCredentials()). |
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auto channel = |
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grpc::CreateChannel(target_str, grpc::InsecureChannelCredentials()); |
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std::mutex mu; |
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std::condition_variable cv; |
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int done_count = 0; |
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// Callbacks will be called on background threads |
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std::unique_lock<std::mutex> lock(mu); |
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ClientContext hello_context; |
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helloworld::HelloRequest hello_request; |
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helloworld::HelloReply hello_response; |
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Status hello_status; |
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ClientContext feature_context; |
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routeguide::Point feature_request; |
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routeguide::Feature feature_response; |
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Status feature_status; |
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// Request to a Greeter service |
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hello_request.set_name("user"); |
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helloworld::Greeter::NewStub(channel)->async()->SayHello( |
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&hello_context, &hello_request, &hello_response, [&](Status status) { |
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std::lock_guard<std::mutex> lock(mu); |
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done_count++; |
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hello_status = std::move(status); |
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cv.notify_all(); |
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}); |
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// Request to a RouteGuide service |
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feature_request.set_latitude(50); |
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feature_request.set_longitude(100); |
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routeguide::RouteGuide::NewStub(channel)->async()->GetFeature( |
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&feature_context, &feature_request, &feature_response, |
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[&](Status status) { |
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std::lock_guard<std::mutex> lock(mu); |
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done_count++; |
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feature_status = std::move(status); |
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cv.notify_all(); |
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}); |
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// Wait for both requests to finish |
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cv.wait(lock, [&]() { return done_count == 2; }); |
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if (hello_status.ok()) { |
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std::cout << "Greeter received: " << hello_response.message() << std::endl; |
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} else { |
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std::cerr << "Greeter failed: " << hello_status.error_message() |
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<< std::endl; |
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} |
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if (feature_status.ok()) { |
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std::cout << "Found feature: " << feature_response.name() << std::endl; |
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} else { |
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std::cerr << "Getting feature failed: " << feature_status.error_message() |
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<< std::endl; |
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} |
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return 0; |
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}
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