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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#ifndef GRPCPP_IMPL_CODEGEN_CALLBACK_COMMON_H
#define GRPCPP_IMPL_CODEGEN_CALLBACK_COMMON_H
#include <functional>
#include <grpc/impl/codegen/grpc_types.h>
#include <grpcpp/impl/codegen/call.h>
#include <grpcpp/impl/codegen/channel_interface.h>
#include <grpcpp/impl/codegen/config.h>
#include <grpcpp/impl/codegen/core_codegen_interface.h>
#include <grpcpp/impl/codegen/status.h>
namespace grpc {
namespace internal {
/// An exception-safe way of invoking a user-specified callback function
template <class Func, class Arg>
void CatchingCallback(Func&& func, Arg&& arg) {
#if GRPC_ALLOW_EXCEPTIONS
try {
func(arg);
} catch (...) {
// nothing to return or change here, just don't crash the library
}
#else // GRPC_ALLOW_EXCEPTIONS
func(arg);
#endif // GRPC_ALLOW_EXCEPTIONS
}
// The contract on these tags is that they are single-shot. They must be
// constructed and then fired at exactly one point. There is no expectation
// that they can be reused without reconstruction.
class CallbackWithStatusTag
: public grpc_experimental_completion_queue_functor {
public:
// always allocated against a call arena, no memory free required
static void operator delete(void* ptr, std::size_t size) {
assert(size == sizeof(CallbackWithStatusTag));
}
// This operator should never be called as the memory should be freed as part
// of the arena destruction. It only exists to provide a matching operator
// delete to the operator new so that some compilers will not complain (see
// https://github.com/grpc/grpc/issues/11301) Note at the time of adding this
// there are no tests catching the compiler warning.
static void operator delete(void*, void*) { assert(0); }
CallbackWithStatusTag(grpc_call* call, std::function<void(Status)> f,
CompletionQueueTag* ops)
: call_(call), func_(std::move(f)), ops_(ops) {
g_core_codegen_interface->grpc_call_ref(call);
functor_run = &CallbackWithStatusTag::StaticRun;
}
~CallbackWithStatusTag() {}
Status* status_ptr() { return &status_; }
// force_run can not be performed on a tag if operations using this tag
// have been sent to PerformOpsOnCall. It is intended for error conditions
// that are detected before the operations are internally processed.
void force_run(Status s) {
status_ = std::move(s);
Run(true);
}
private:
grpc_call* call_;
std::function<void(Status)> func_;
CompletionQueueTag* ops_;
Status status_;
static void StaticRun(grpc_experimental_completion_queue_functor* cb,
int ok) {
static_cast<CallbackWithStatusTag*>(cb)->Run(static_cast<bool>(ok));
}
void Run(bool ok) {
void* ignored = ops_;
GPR_CODEGEN_ASSERT(ops_->FinalizeResult(&ignored, &ok));
GPR_CODEGEN_ASSERT(ignored == ops_);
// Last use of func_ or status_, so ok to move them out
CatchingCallback(std::move(func_), std::move(status_));
func_ = nullptr; // reset to clear this out for sure
status_ = Status(); // reset to clear this out for sure
g_core_codegen_interface->grpc_call_unref(call_);
}
};
class CallbackWithSuccessTag
: public grpc_experimental_completion_queue_functor {
public:
// always allocated against a call arena, no memory free required
static void operator delete(void* ptr, std::size_t size) {
assert(size == sizeof(CallbackWithSuccessTag));
}
// This operator should never be called as the memory should be freed as part
// of the arena destruction. It only exists to provide a matching operator
// delete to the operator new so that some compilers will not complain (see
// https://github.com/grpc/grpc/issues/11301) Note at the time of adding this
// there are no tests catching the compiler warning.
static void operator delete(void*, void*) { assert(0); }
CallbackWithSuccessTag(grpc_call* call, std::function<void(bool)> f,
CompletionQueueTag* ops)
: call_(call), func_(std::move(f)), ops_(ops) {
g_core_codegen_interface->grpc_call_ref(call);
functor_run = &CallbackWithSuccessTag::StaticRun;
}
CompletionQueueTag* ops() { return ops_; }
// force_run can not be performed on a tag if operations using this tag
// have been sent to PerformOpsOnCall. It is intended for error conditions
// that are detected before the operations are internally processed.
void force_run(bool ok) { Run(ok); }
private:
grpc_call* call_;
std::function<void(bool)> func_;
CompletionQueueTag* ops_;
static void StaticRun(grpc_experimental_completion_queue_functor* cb,
int ok) {
static_cast<CallbackWithSuccessTag*>(cb)->Run(static_cast<bool>(ok));
}
void Run(bool ok) {
void* ignored = ops_;
bool new_ok = ok;
GPR_CODEGEN_ASSERT(ops_->FinalizeResult(&ignored, &new_ok));
GPR_CODEGEN_ASSERT(ignored == ops_);
// Last use of func_, so ok to move it out for rvalue call above
CatchingCallback(std::move(func_), ok);
func_ = nullptr; // reset to clear this out for sure
g_core_codegen_interface->grpc_call_unref(call_);
}
};
} // namespace internal
} // namespace grpc
#endif // GRPCPP_IMPL_CODEGEN_CALLBACK_COMMON_H
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