include/proxy/TransformInternal.h

/** @file

  A brief file description

  @section license License

  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you 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 "proxy/http/HttpSM.h"

class TransformVConnection;

class TransformTerminus : public VConnection
{
public:
  TransformTerminus(TransformVConnection *tvc);
  ~TransformTerminus() override;

  int handle_event(int event, void *edata);

  VIO *do_io_read(Continuation *c, int64_t nbytes, MIOBuffer *buf) override;
  VIO *do_io_write(Continuation *c, int64_t nbytes, IOBufferReader *buf, bool owner = false) override;
  void do_io_close(int lerrno = -1) override;
  void do_io_shutdown(ShutdownHowTo_t howto) override;

  void reenable(VIO *vio) override;

public:
  TransformVConnection *m_tvc;
  VIO                   m_read_vio;
  VIO                   m_write_vio;
  int                   m_event_count;
  int                   m_deletable;
  int                   m_closed;
  int                   m_called_user;

private:
  Event *_read_event     = nullptr;
  bool   _read_disabled  = true;
  Event *_write_event    = nullptr;
  bool   _write_disabled = true;
};

class TransformVConnection : public TransformVCChain
{
public:
  TransformVConnection(Continuation *cont, APIHook *hooks);
  ~TransformVConnection() override;

  int handle_event(int event, void *edata);

  VIO *do_io_read(Continuation *c, int64_t nbytes, MIOBuffer *buf) override;
  VIO *do_io_write(Continuation *c, int64_t nbytes, IOBufferReader *buf, bool owner = false) override;
  void do_io_close(int lerrno = -1) override;
  void do_io_shutdown(ShutdownHowTo_t howto) override;

  void reenable(VIO *vio) override;

  /** Compute the backlog.
      @return The actual backlog, or a value at least @a limit.
  */
  uint64_t backlog(uint64_t limit = UINT64_MAX) override;

public:
  VConnection      *m_transform;
  Continuation     *m_cont;
  TransformTerminus m_terminus;
  int               m_closed;
};

class TransformControl : public Continuation
{
public:
  TransformControl();

  int handle_event(int event, void *edata);

public:
  APIHooks        m_hooks;
  VConnection    *m_tvc       = nullptr;
  IOBufferReader *m_read_buf  = nullptr;
  MIOBuffer      *m_write_buf = nullptr;
};

class NullTransform : public INKVConnInternal
{
public:
  NullTransform(ProxyMutex *mutex);
  ~NullTransform() override;

  int handle_event(int event, void *edata);

public:
  MIOBuffer      *m_output_buf;
  IOBufferReader *m_output_reader;
  VIO            *m_output_vio;
};

class RangeTransform : public INKVConnInternal
{
public:
  RangeTransform(ProxyMutex *mutex, RangeRecord *ranges, int num_fields, HTTPHdr *transform_resp, const char *content_type,
                 int content_type_len, int64_t content_length);
  ~RangeTransform() override;

  int handle_event(int event, void *edata);

  void transform_to_range();
  void add_boundary(bool end);
  void add_sub_header(int index);
  void change_response_header();
  void calculate_output_cl();

public:
  MIOBuffer      *m_output_buf;
  IOBufferReader *m_output_reader;

  HTTPHdr     *m_transform_resp;
  VIO         *m_output_vio;
  int64_t      m_range_content_length;
  int          m_num_chars_for_cl;
  int          m_num_range_fields;
  int          m_current_range;
  const char  *m_content_type;
  int          m_content_type_len;
  RangeRecord *m_ranges;
  int64_t      m_output_cl;
  int64_t      m_done;
};