LengthFieldPrepender.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 <folly/io/Cursor.h>
#include <wangle/channel/Handler.h>

namespace wangle {

class LengthFieldPrepender : public OutboundBytesToBytesHandler {
 public:
  explicit LengthFieldPrepender(int lengthFieldLength = 4,
                                int lengthAdjustment = 0,
                                bool lengthIncludesLengthField = false,
                                bool networkByteOrder = true);

  folly::Future<folly::Unit> write(
      Context* ctx,
      std::unique_ptr<folly::IOBuf> buf) override;

 private:
  int lengthFieldLength_;
  int lengthAdjustment_;
  bool lengthIncludesLengthField_;
  bool networkByteOrder_;
};

} // namespace wangle