RequestHandler.h

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/*
 *  Copyright (c) 2015-present, Facebook, Inc.
 *  All rights reserved.
 *
 *  This source code is licensed under the BSD-style license found in the
 *  LICENSE file in the root directory of this source tree. An additional grant
 *  of patent rights can be found in the PATENTS file in the same directory.
 *
 */
#pragma once

#include <proxygen/lib/http/session/HTTPTransaction.h>

namespace proxygen {

class ResponseHandler;
class ExMessageHandler;

class RequestHandler {
 public:
  virtual void setResponseHandler(ResponseHandler* handler) noexcept {
    downstream_ = CHECK_NOTNULL(handler);
  }

  virtual void onRequest(std::unique_ptr<HTTPMessage> headers) noexcept = 0;

  virtual void onBody(std::unique_ptr<folly::IOBuf> body) noexcept = 0;

  virtual void onUpgrade(proxygen::UpgradeProtocol prot) noexcept = 0;

  virtual void onEOM() noexcept = 0;

  virtual void requestComplete() noexcept = 0;

  virtual void onError(ProxygenError err) noexcept = 0;

  virtual void onEgressPaused() noexcept {
  }

  virtual void onEgressResumed() noexcept {
  }

  virtual bool canHandleExpect() noexcept {
    return false;
  }

  virtual ExMessageHandler* getExHandler() noexcept {
    LOG(FATAL) << "Not implemented";
  }

  virtual ResponseHandler* getDownstream() noexcept {
    return downstream_;
  }

  virtual ~RequestHandler() {}

 protected:
  ResponseHandler* downstream_{nullptr};
};

}