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[C++] Improve flatbuffers + gRPC integration (#4310)

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* 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
This commit is contained in:
Lawrence Chan
2017-06-07 15:56:49 -05:00
committed by Wouter van Oortmerssen
parent dadd1a926e
commit da67c0a71f
15 changed files with 583 additions and 141 deletions
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22
tests/monster_test.grpc.fb.cc
View File

@@ -31,46 +31,46 @@ MonsterStorage::Stub::Stub(const std::shared_ptr< ::grpc::ChannelInterface>& cha
, rpcmethod_Retrieve_(MonsterStorage_method_names[1], ::grpc::RpcMethod::SERVER_STREAMING, channel)
{}
::grpc::Status MonsterStorage::Stub::Store(::grpc::ClientContext* context, const flatbuffers::BufferRef<Monster>& request, flatbuffers::BufferRef<Stat>* response) {
::grpc::Status MonsterStorage::Stub::Store(::grpc::ClientContext* context, const flatbuffers::grpc::Message<Monster>& request, flatbuffers::grpc::Message<Stat>* response) {
return ::grpc::BlockingUnaryCall(channel_.get(), rpcmethod_Store_, context, request, response);
}
::grpc::ClientAsyncResponseReader< flatbuffers::BufferRef<Stat>>* MonsterStorage::Stub::AsyncStoreRaw(::grpc::ClientContext* context, const flatbuffers::BufferRef<Monster>& request, ::grpc::CompletionQueue* cq) {
return ::grpc::ClientAsyncResponseReader< flatbuffers::BufferRef<Stat>>::Create(channel_.get(), cq, rpcmethod_Store_, context, request);
::grpc::ClientAsyncResponseReader< flatbuffers::grpc::Message<Stat>>* MonsterStorage::Stub::AsyncStoreRaw(::grpc::ClientContext* context, const flatbuffers::grpc::Message<Monster>& request, ::grpc::CompletionQueue* cq) {
return ::grpc::ClientAsyncResponseReader< flatbuffers::grpc::Message<Stat>>::Create(channel_.get(), cq, rpcmethod_Store_, context, request);
}
::grpc::ClientReader< flatbuffers::BufferRef<Monster>>* MonsterStorage::Stub::RetrieveRaw(::grpc::ClientContext* context, const flatbuffers::BufferRef<Stat>& request) {
return new ::grpc::ClientReader< flatbuffers::BufferRef<Monster>>(channel_.get(), rpcmethod_Retrieve_, context, request);
::grpc::ClientReader< flatbuffers::grpc::Message<Monster>>* MonsterStorage::Stub::RetrieveRaw(::grpc::ClientContext* context, const flatbuffers::grpc::Message<Stat>& request) {
return new ::grpc::ClientReader< flatbuffers::grpc::Message<Monster>>(channel_.get(), rpcmethod_Retrieve_, context, request);
}
::grpc::ClientAsyncReader< flatbuffers::BufferRef<Monster>>* MonsterStorage::Stub::AsyncRetrieveRaw(::grpc::ClientContext* context, const flatbuffers::BufferRef<Stat>& request, ::grpc::CompletionQueue* cq, void* tag) {
return ::grpc::ClientAsyncReader< flatbuffers::BufferRef<Monster>>::Create(channel_.get(), cq, rpcmethod_Retrieve_, context, request, tag);
::grpc::ClientAsyncReader< flatbuffers::grpc::Message<Monster>>* MonsterStorage::Stub::AsyncRetrieveRaw(::grpc::ClientContext* context, const flatbuffers::grpc::Message<Stat>& request, ::grpc::CompletionQueue* cq, void* tag) {
return ::grpc::ClientAsyncReader< flatbuffers::grpc::Message<Monster>>::Create(channel_.get(), cq, rpcmethod_Retrieve_, context, request, tag);
}
MonsterStorage::Service::Service() {
AddMethod(new ::grpc::RpcServiceMethod(
MonsterStorage_method_names[0],
::grpc::RpcMethod::NORMAL_RPC,
new ::grpc::RpcMethodHandler< MonsterStorage::Service, flatbuffers::BufferRef<Monster>, flatbuffers::BufferRef<Stat>>(
new ::grpc::RpcMethodHandler< MonsterStorage::Service, flatbuffers::grpc::Message<Monster>, flatbuffers::grpc::Message<Stat>>(
std::mem_fn(&MonsterStorage::Service::Store), this)));
AddMethod(new ::grpc::RpcServiceMethod(
MonsterStorage_method_names[1],
::grpc::RpcMethod::SERVER_STREAMING,
new ::grpc::ServerStreamingHandler< MonsterStorage::Service, flatbuffers::BufferRef<Stat>, flatbuffers::BufferRef<Monster>>(
new ::grpc::ServerStreamingHandler< MonsterStorage::Service, flatbuffers::grpc::Message<Stat>, flatbuffers::grpc::Message<Monster>>(
std::mem_fn(&MonsterStorage::Service::Retrieve), this)));
}
MonsterStorage::Service::~Service() {
}
::grpc::Status MonsterStorage::Service::Store(::grpc::ServerContext* context, const flatbuffers::BufferRef<Monster>* request, flatbuffers::BufferRef<Stat>* response) {
::grpc::Status MonsterStorage::Service::Store(::grpc::ServerContext* context, const flatbuffers::grpc::Message<Monster>* request, flatbuffers::grpc::Message<Stat>* response) {
(void) context;
(void) request;
(void) response;
return ::grpc::Status(::grpc::StatusCode::UNIMPLEMENTED, "");
}
::grpc::Status MonsterStorage::Service::Retrieve(::grpc::ServerContext* context, const flatbuffers::BufferRef<Stat>* request, ::grpc::ServerWriter< flatbuffers::BufferRef<Monster>>* writer) {
::grpc::Status MonsterStorage::Service::Retrieve(::grpc::ServerContext* context, const flatbuffers::grpc::Message<Stat>* request, ::grpc::ServerWriter< flatbuffers::grpc::Message<Monster>>* writer) {
(void) context;
(void) request;
(void) writer;