mirror of
https://github.com/google/flatbuffers.git
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da67c0a71f
* Rework flatbuffers + gRPC integration - Introduce `flatbuffers::grpc::Message<T>`, a `grpc_slice`-backed message buffer that handles refcounting and allows flatbuffers to transfer ownership to gRPC efficiently. This replaces `flatbuffers::BufferRef<T>`, which required a copy call and was also unsafe w.r.t. buffer lifetime. - Introduce `flatbuffers::grpc::MessageBuilder`, a gRPC-specific builder that forces a `grpc_slice`-backed allocator and also adds some helpful `Message<T>`-related methods. - Update serializers accordingly (now zero-copy between flatbuffers and gRPC). * gRPC: verify messages by default, but allow user to override * gRPC: fix some formatting issues * Disable verification by default, but add helper method * Make FlatBufferBuilder fields protected + remove vec accessor * Use bool add_ref parameter to toggle refcount incr * Remove unnecessary inline specifiers * Fix formatting * Use auto * Remove empty lines * Use grpc_slice helper macros * Simplify reset code * Disable Message copy ctor and assignment by default * Remove unused member * Enable gRPC verification by default * Use auto * Bake in message verification (remove template specialization) * Add RoundUp func * Consolidate gRPC message copy flag * Make vector_downward allocations fully lazy * Test message verification failure code/message * Add grpctest verification test comments * Simplify reallocate implementation * Make initial_size a size_t * Use ternary op for growth_policy * Use truthiness rather than dont explicit nullptr check * Indent preprocessor directives * Remove grpc message copy/assignment * Fix a few bugs * Add gRPC example * Add basic gRPC docs * Use doxygen EXAMPLE_PATH + @include * Reference example fbs in grpc docs * Move gRPC examples into grpc/samples * Fix pointer/reference formatting * Use std::function rather than templated callback func * Create fresh message builder for each request * Use Clear() in Reset() impl * Use FLATBUFFERS_CONSTEXPR
86 lines
2.5 KiB
C++
86 lines
2.5 KiB
C++
#include "greeter.grpc.fb.h"
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#include "greeter_generated.h"
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#include <grpc++/grpc++.h>
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#include <iostream>
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#include <memory>
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#include <string>
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class GreeterClient {
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public:
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GreeterClient(std::shared_ptr<grpc::Channel> channel)
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: stub_(Greeter::NewStub(channel)) {}
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std::string SayHello(const std::string &name) {
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flatbuffers::grpc::MessageBuilder mb;
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auto name_offset = mb.CreateString(name);
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auto request_offset = CreateHelloRequest(mb, name_offset);
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mb.Finish(request_offset);
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auto request_msg = mb.ReleaseMessage<HelloRequest>();
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flatbuffers::grpc::Message<HelloReply> response_msg;
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grpc::ClientContext context;
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auto status = stub_->SayHello(&context, request_msg, &response_msg);
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if (status.ok()) {
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const HelloReply *response = response_msg.GetRoot();
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return response->message()->str();
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} else {
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std::cerr << 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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void SayManyHellos(const std::string &name, int num_greetings,
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std::function<void(const std::string &)> callback) {
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flatbuffers::grpc::MessageBuilder mb;
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auto name_offset = mb.CreateString(name);
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auto request_offset =
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CreateManyHellosRequest(mb, name_offset, num_greetings);
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mb.Finish(request_offset);
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auto request_msg = mb.ReleaseMessage<ManyHellosRequest>();
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flatbuffers::grpc::Message<HelloReply> response_msg;
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grpc::ClientContext context;
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auto stream = stub_->SayManyHellos(&context, request_msg);
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while (stream->Read(&response_msg)) {
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const HelloReply *response = response_msg.GetRoot();
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callback(response->message()->str());
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}
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auto status = stream->Finish();
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if (!status.ok()) {
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std::cerr << status.error_code() << ": " << status.error_message()
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<< std::endl;
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callback("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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std::string server_address("localhost:50051");
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auto channel =
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grpc::CreateChannel(server_address, grpc::InsecureChannelCredentials());
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GreeterClient greeter(channel);
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std::string name("world");
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std::string message = greeter.SayHello(name);
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std::cerr << "Greeter received: " << message << std::endl;
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int num_greetings = 10;
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greeter.SayManyHellos(name, num_greetings, [](const std::string &message) {
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std::cerr << "Greeter received: " << message << std::endl;
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});
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return 0;
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}
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