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Contents
// Copyright 2021 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 GRPC_CORE_LIB_CHANNEL_CHANNEL_ARGS_PRECONDITIONING_H
#define GRPC_CORE_LIB_CHANNEL_CHANNEL_ARGS_PRECONDITIONING_H
#include <grpc/support/port_platform.h>
#include <functional>
#include <vector>
#include <grpc/impl/codegen/grpc_types.h>
#include "src/core/lib/channel/channel_args.h"
namespace grpc_core {
// Registry of mutators for channel args.
// Surface APIs should call into this with channel args received from outside
// of gRPC, in order to prepare those channel args for the expections of the
// gRPC internals.
class ChannelArgsPreconditioning {
public:
// Take channel args and mutate them.
// Does not take ownership of the channel args passed in.
// Returns a new channel args object that is owned by the caller.
using Stage = std::function<ChannelArgs(ChannelArgs)>;
class Builder {
public:
// Register a new channel args preconditioner.
void RegisterStage(Stage stage);
// Build out the preconditioners.
ChannelArgsPreconditioning Build();
private:
std::vector<Stage> stages_;
};
// Take channel args and precondition them.
// Does not take ownership of the channel args passed in.
// Returns a new channel args object that is owned by the caller.
ChannelArgs PreconditionChannelArgs(const grpc_channel_args* args) const;
private:
std::vector<Stage> stages_;
};
} // namespace grpc_core
#endif // GRPC_CORE_LIB_CHANNEL_CHANNEL_ARGS_PRECONDITIONING_H
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