RoutingDataHandler.h

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/*
 * Copyright 2017-present Facebook, Inc.
 *
 * 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.
 */
#pragma once

#include <wangle/channel/AsyncSocketHandler.h>

namespace wangle {

template <typename R>
class RoutingDataHandler : public wangle::BytesToBytesHandler {
 public:
  struct RoutingData {
    RoutingData() : bufQueue(folly::IOBufQueue::cacheChainLength()) {}

    R routingData;
    folly::IOBufQueue bufQueue;
  };

  class Callback {
   public:
    virtual ~Callback() {}
    virtual void onRoutingData(uint64_t connId, RoutingData& routingData) = 0;
    virtual void onError(uint64_t connId, folly::exception_wrapper ex) = 0;
  };

  RoutingDataHandler(uint64_t connId, Callback* cob);
  ~RoutingDataHandler() override {}

  // BytesToBytesHandler implementation
  void read(Context* ctx, folly::IOBufQueue& q) override;
  void readEOF(Context* ctx) override;
  void readException(Context* ctx, folly::exception_wrapper ex) override;

  virtual bool parseRoutingData(folly::IOBufQueue& bufQueue,
                                RoutingData& routingData) = 0;

 private:
  uint64_t connId_;
  Callback* cob_{nullptr};
};

template <typename R>
class RoutingDataHandlerFactory {
 public:
  virtual ~RoutingDataHandlerFactory() {}

  virtual std::shared_ptr<RoutingDataHandler<R>> newHandler(
      uint64_t connId, typename RoutingDataHandler<R>::Callback* cob) = 0;
};

} // namespace wangle

#include <wangle/bootstrap/RoutingDataHandler-inl.h>