mirror of https://github.com/grpc/grpc.git
The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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101 lines
3.4 KiB
101 lines
3.4 KiB
/* |
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* |
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* Copyright 2015, Google Inc. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions are |
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* met: |
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* |
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* * Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* * Redistributions in binary form must reproduce the above |
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* copyright notice, this list of conditions and the following disclaimer |
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* in the documentation and/or other materials provided with the |
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* distribution. |
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* * Neither the name of Google Inc. nor the names of its |
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* contributors may be used to endorse or promote products derived from |
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* this software without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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* |
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*/ |
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#include <iostream> |
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#include <memory> |
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#include <string> |
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#include <grpc++/grpc++.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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using grpc::Channel; |
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using grpc::ClientContext; |
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using grpc::Status; |
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using helloworld::HelloRequest; |
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using helloworld::HelloReply; |
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using helloworld::Greeter; |
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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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Status status = stub_->SayHello(&context, request, &reply); |
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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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// 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 (in this case, |
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// localhost at port 50051). We indicate that the channel isn't authenticated |
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// (use of InsecureChannelCredentials()). |
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GreeterClient greeter(grpc::CreateChannel( |
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"localhost:50051", 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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