apidefs.h.in

/** @file

  This header file defines common types that can be shared
  between internal code and TS APIs.

  @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.

  @section developers Developers

  Developers, when adding a new element to an enum, append it. DO NOT
  insert it.  Otherwise, binary compatibility of plugins will be broken!

 */

#pragma once

/*
 * ATS Plugin just needs to include <ts/ts.h>,
 * should not include this file directly!
 *
 */

/* GENERATED FILE WARNING!  DO NOT EDIT apidefs.h
 *
 * You must modify apidefs.h.in instead.
 *
 */

#include <cstdint>
#include <netinet/in.h>
#include <sys/types.h>
#include <sys/socket.h>

/** Apply printf format string compile-time argument checking to a function.
 *
 *
 * For example, given the following function from DiagsTypes.h:
 *
 * @code
 * class Diags {
 *
 * ...
 *
 * void
 * print(
 *     const char *tag,
 *     DiagsLevel level,
 *     const SourceLocation *loc,
 *     const char *fmt,
 *     ...) const;
 *
 * ...
 *
 * };
 * @endcode
 *
 * This macro can be used to apply compiler checking for ... against the fmt
 * argument like so:
 *
 *
 * @code
 * class Diags {
 *
 * ...
 *
 * void
 * print(
 *     const char *tag,
 *     DiagsLevel level,
 *     const SourceLocation *loc,
 *     const char *fmt,
 *     ...) const TS_PRINTFLIKE(5, 6);
 *
 * ...
 *
 * };
 * @endcode
 *
 * Note in this case, (5, 6) rather than (4, 5) is passed because `this`
 * counts as the implicit first parameter of this member function.
 *
 * @param[in] fmt_index The index of the format string argument, with argument
 * indexing starting at 1.
 *
 * @param[in] arg_index The index of the first format argument string, with
 * argument indexing starting at 1.
 */
#if !defined(TS_PRINTFLIKE)
#if defined(__GNUC__) || defined(__clang__)
#define TS_PRINTFLIKE(fmt_index, arg_index) __attribute__((format(printf, fmt_index, arg_index)))
#else
#define TS_PRINTFLIKE(fmt_index, arg_index)
#endif
#endif

#if !defined(TS_NORETURN)
#if defined(__GNUC__) || defined(__clang__)
#define TS_NORETURN __attribute__((noreturn))
#else
#define TS_NORETURN
#endif
#endif

/* Version info
 *
 * Version numbers need to be preprocessor symbols for conditional compilation.
 */
/* clang-format off */
char const TS_VERSION_STRING[] = "@TS_VERSION_STRING@";
#define TS_VERSION_NUMBER @TS_VERSION_NUMBER@
#define TS_VERSION_MAJOR @TS_VERSION_MAJOR@
#define TS_VERSION_MINOR @TS_VERSION_MINOR@
#define TS_VERSION_MICRO @TS_VERSION_MICRO@
/* clang-format on */

constexpr long
TS_HTTP_VERSION(int a, int b)
{
  return ((long(a) & 0xFFFF) << 16) | (b & 0xFFFF);
}
constexpr int
TS_HTTP_MINOR(long v)
{
  return int(v & 0xFFFF);
}
constexpr int
TS_HTTP_MAJOR(long v)
{
  return int((v >> 16) & 0xFFFF);
}

#ifndef TS_RES_MEM_PATH
#define __TS_RES_PATH(x) #x
#define _TS_RES_PATH(x)  __TS_RES_PATH(x)
#define TS_RES_PATH(x)   x __FILE__ ":" _TS_RES_PATH(__LINE__)
#define TS_RES_MEM_PATH  TS_RES_PATH("memory/")
#endif

/**
    The following struct is used by TSPluginRegister(). It stores
    registration information about the plugin.

 */
struct TSPluginRegistrationInfo {
  const char *plugin_name;
  const char *vendor_name;
  const char *support_email;
};

struct TSPluginMsg {
  const char *tag;       ///< Message tag (null terminated).
  void const *data;      ///< Message data (payload)
  size_t      data_size; ///< Amount of message data.
};

/**
    This set of enums are possible values returned by
    TSHttpHdrParseReq() and TSHttpHdrParseResp().

 */
enum TSParseResult {
  TS_PARSE_ERROR = -1,
  TS_PARSE_DONE  = 0,
  TS_PARSE_CONT  = 1,
};

/**
    This set of enums represents the possible HTTP types that
    can be assigned to an HTTP header. When a header is created
    with TSHttpHdrCreate(), it is automatically assigned a type of
    TS_HTTP_TYPE_UNKNOWN. You can modify the HTTP type ONCE after it
    the header is created, using TSHttpHdrTypeSet(). After setting the
    HTTP type once, you cannot set it again. Use TSHttpHdrTypeGet()
    to obtain the TSHttpType of an HTTP header.

 */
enum TSHttpType {
  TS_HTTP_TYPE_UNKNOWN,
  TS_HTTP_TYPE_REQUEST,
  TS_HTTP_TYPE_RESPONSE,
};

/**
    This set of enums represents possible return values from
    TSHttpHdrStatusGet(), which retrieves the status code from an
    HTTP response header (TSHttpHdrStatusGet() retrieves status codes
    only from headers of type TS_HTTP_TYPE_RESPONSE). You can also set
    the TSHttpStatus of a response header using TSHttpHdrStatusSet().

 */
enum TSHttpStatus {
  TS_HTTP_STATUS_NONE                            = 0,
  TS_HTTP_STATUS_CONTINUE                        = 100,
  TS_HTTP_STATUS_SWITCHING_PROTOCOL              = 101,
  TS_HTTP_STATUS_EARLY_HINTS                     = 103,
  TS_HTTP_STATUS_OK                              = 200,
  TS_HTTP_STATUS_CREATED                         = 201,
  TS_HTTP_STATUS_ACCEPTED                        = 202,
  TS_HTTP_STATUS_NON_AUTHORITATIVE_INFORMATION   = 203,
  TS_HTTP_STATUS_NO_CONTENT                      = 204,
  TS_HTTP_STATUS_RESET_CONTENT                   = 205,
  TS_HTTP_STATUS_PARTIAL_CONTENT                 = 206,
  TS_HTTP_STATUS_MULTI_STATUS                    = 207,
  TS_HTTP_STATUS_ALREADY_REPORTED                = 208,
  TS_HTTP_STATUS_IM_USED                         = 211,
  TS_HTTP_STATUS_MULTIPLE_CHOICES                = 300,
  TS_HTTP_STATUS_MOVED_PERMANENTLY               = 301,
  TS_HTTP_STATUS_MOVED_TEMPORARILY               = 302,
  TS_HTTP_STATUS_SEE_OTHER                       = 303,
  TS_HTTP_STATUS_NOT_MODIFIED                    = 304,
  TS_HTTP_STATUS_USE_PROXY                       = 305,
  TS_HTTP_STATUS_TEMPORARY_REDIRECT              = 307,
  TS_HTTP_STATUS_PERMANENT_REDIRECT              = 308,
  TS_HTTP_STATUS_BAD_REQUEST                     = 400,
  TS_HTTP_STATUS_UNAUTHORIZED                    = 401,
  TS_HTTP_STATUS_PAYMENT_REQUIRED                = 402,
  TS_HTTP_STATUS_FORBIDDEN                       = 403,
  TS_HTTP_STATUS_NOT_FOUND                       = 404,
  TS_HTTP_STATUS_METHOD_NOT_ALLOWED              = 405,
  TS_HTTP_STATUS_NOT_ACCEPTABLE                  = 406,
  TS_HTTP_STATUS_PROXY_AUTHENTICATION_REQUIRED   = 407,
  TS_HTTP_STATUS_REQUEST_TIMEOUT                 = 408,
  TS_HTTP_STATUS_CONFLICT                        = 409,
  TS_HTTP_STATUS_GONE                            = 410,
  TS_HTTP_STATUS_LENGTH_REQUIRED                 = 411,
  TS_HTTP_STATUS_PRECONDITION_FAILED             = 412,
  TS_HTTP_STATUS_REQUEST_ENTITY_TOO_LARGE        = 413,
  TS_HTTP_STATUS_REQUEST_URI_TOO_LONG            = 414,
  TS_HTTP_STATUS_UNSUPPORTED_MEDIA_TYPE          = 415,
  TS_HTTP_STATUS_REQUESTED_RANGE_NOT_SATISFIABLE = 416,
  TS_HTTP_STATUS_EXPECTATION_FAILED              = 417,
  TS_HTTP_STATUS_UNPROCESSABLE_ENTITY            = 422,
  TS_HTTP_STATUS_LOCKED                          = 423,
  TS_HTTP_STATUS_FAILED_DEPENDENCY               = 424,
  TS_HTTP_STATUS_UPGRADE_REQUIRED                = 426,
  TS_HTTP_STATUS_PRECONDITION_REQUIRED           = 428,
  TS_HTTP_STATUS_TOO_MANY_REQUESTS               = 429,
  TS_HTTP_STATUS_REQUEST_HEADER_FIELDS_TOO_LARGE = 431,
  TS_HTTP_STATUS_UNAVAILABLE_FOR_LEGAL_REASONS   = 451,
  TS_HTTP_STATUS_INTERNAL_SERVER_ERROR           = 500,
  TS_HTTP_STATUS_NOT_IMPLEMENTED                 = 501,
  TS_HTTP_STATUS_BAD_GATEWAY                     = 502,
  TS_HTTP_STATUS_SERVICE_UNAVAILABLE             = 503,
  TS_HTTP_STATUS_GATEWAY_TIMEOUT                 = 504,
  TS_HTTP_STATUS_HTTPVER_NOT_SUPPORTED           = 505,
  TS_HTTP_STATUS_VARIANT_ALSO_NEGOTIATES         = 506,
  TS_HTTP_STATUS_INSUFFICIENT_STORAGE            = 507,
  TS_HTTP_STATUS_LOOP_DETECTED                   = 508,
  TS_HTTP_STATUS_NOT_EXTENDED                    = 510,
  TS_HTTP_STATUS_NETWORK_AUTHENTICATION_REQUIRED = 511,
};

/**
    TSEvents are sent to continuations when they are called back.
    The TSEvent provides the continuation's handler function with
    information about the callback. Based on the event it receives,
    the handler function can decide what to do.
 */
enum TSEvent {
  TS_EVENT_NONE      = 0,
  TS_EVENT_IMMEDIATE = 1,
  TS_EVENT_TIMEOUT   = 2,
  TS_EVENT_ERROR     = 3,
  TS_EVENT_CONTINUE  = 4,

  TS_EVENT_VCONN_READ_READY         = 100,
  TS_EVENT_VCONN_WRITE_READY        = 101,
  TS_EVENT_VCONN_READ_COMPLETE      = 102,
  TS_EVENT_VCONN_WRITE_COMPLETE     = 103,
  TS_EVENT_VCONN_EOS                = 104,
  TS_EVENT_VCONN_INACTIVITY_TIMEOUT = 105,
  TS_EVENT_VCONN_ACTIVE_TIMEOUT     = 106,
  TS_EVENT_VCONN_START              = 107,
  TS_EVENT_VCONN_CLOSE              = 108,
  TS_EVENT_VCONN_OUTBOUND_START     = 109,
  TS_EVENT_VCONN_OUTBOUND_CLOSE     = 110,
  TS_EVENT_VCONN_PRE_ACCEPT         = TS_EVENT_VCONN_START, // Deprecated but still compatible

  TS_EVENT_NET_CONNECT        = 200,
  TS_EVENT_NET_CONNECT_FAILED = 201,
  TS_EVENT_NET_ACCEPT         = 202,
  TS_EVENT_NET_ACCEPT_FAILED  = 204,

  TS_EVENT_HOST_LOOKUP = 500,

  TS_EVENT_CACHE_OPEN_READ              = 1102,
  TS_EVENT_CACHE_OPEN_READ_FAILED       = 1103,
  TS_EVENT_CACHE_OPEN_WRITE             = 1108,
  TS_EVENT_CACHE_OPEN_WRITE_FAILED      = 1109,
  TS_EVENT_CACHE_REMOVE                 = 1112,
  TS_EVENT_CACHE_REMOVE_FAILED          = 1113,
  TS_EVENT_CACHE_SCAN                   = 1120,
  TS_EVENT_CACHE_SCAN_FAILED            = 1121,
  TS_EVENT_CACHE_SCAN_OBJECT            = 1122,
  TS_EVENT_CACHE_SCAN_OPERATION_BLOCKED = 1123,
  TS_EVENT_CACHE_SCAN_OPERATION_FAILED  = 1124,
  TS_EVENT_CACHE_SCAN_DONE              = 1125,
  TS_EVENT_CACHE_LOOKUP                 = 1126,
  TS_EVENT_CACHE_READ                   = 1127,
  TS_EVENT_CACHE_DELETE                 = 1128,
  TS_EVENT_CACHE_WRITE                  = 1129,
  TS_EVENT_CACHE_WRITE_HEADER           = 1130,
  TS_EVENT_CACHE_CLOSE                  = 1131,
  TS_EVENT_CACHE_LOOKUP_READY           = 1132,
  TS_EVENT_CACHE_LOOKUP_COMPLETE        = 1133,
  TS_EVENT_CACHE_READ_READY             = 1134,
  TS_EVENT_CACHE_READ_COMPLETE          = 1135,

  TS_EVENT_INTERNAL_1200 = 1200,

  TS_EVENT_SSL_SESSION_GET    = 2000,
  TS_EVENT_SSL_SESSION_NEW    = 2001,
  TS_EVENT_SSL_SESSION_REMOVE = 2002,

  TS_EVENT_AIO_DONE = 3900,

  TS_EVENT_HTTP_CONTINUE                     = 60000,
  TS_EVENT_HTTP_ERROR                        = 60001,
  TS_EVENT_HTTP_READ_REQUEST_HDR             = 60002,
  TS_EVENT_HTTP_OS_DNS                       = 60003,
  TS_EVENT_HTTP_SEND_REQUEST_HDR             = 60004,
  TS_EVENT_HTTP_READ_CACHE_HDR               = 60005,
  TS_EVENT_HTTP_READ_RESPONSE_HDR            = 60006,
  TS_EVENT_HTTP_SEND_RESPONSE_HDR            = 60007,
  TS_EVENT_HTTP_REQUEST_TRANSFORM            = 60008,
  TS_EVENT_HTTP_RESPONSE_TRANSFORM           = 60009,
  TS_EVENT_HTTP_SELECT_ALT                   = 60010,
  TS_EVENT_HTTP_TXN_START                    = 60011,
  TS_EVENT_HTTP_TXN_CLOSE                    = 60012,
  TS_EVENT_HTTP_SSN_START                    = 60013,
  TS_EVENT_HTTP_SSN_CLOSE                    = 60014,
  TS_EVENT_HTTP_CACHE_LOOKUP_COMPLETE        = 60015,
  TS_EVENT_HTTP_PRE_REMAP                    = 60016,
  TS_EVENT_HTTP_POST_REMAP                   = 60017,
  TS_EVENT_HTTP_REQUEST_BUFFER_READ_COMPLETE = 60018,
  TS_EVENT_HTTP_RESPONSE_CLIENT              = 60019,
  TS_EVENT_HTTP_REQUEST_CLIENT               = 60020,
  TS_EVENT_HTTP_TUNNEL_START                 = 60021,

  TS_EVENT_LIFECYCLE_PORTS_INITIALIZED          = 60100,
  TS_EVENT_LIFECYCLE_PORTS_READY                = 60101,
  TS_EVENT_LIFECYCLE_CACHE_READY                = 60102,
  TS_EVENT_LIFECYCLE_SERVER_SSL_CTX_INITIALIZED = 60103,
  TS_EVENT_LIFECYCLE_CLIENT_SSL_CTX_INITIALIZED = 60104,
  TS_EVENT_LIFECYCLE_MSG                        = 60105,
  TS_EVENT_LIFECYCLE_TASK_THREADS_READY         = 60106,
  TS_EVENT_LIFECYCLE_SHUTDOWN                   = 60107,

  TS_EVENT_INTERNAL_60200    = 60200,
  TS_EVENT_INTERNAL_60201    = 60201,
  TS_EVENT_INTERNAL_60202    = 60202,
  TS_EVENT_SSL_CERT          = 60203,
  TS_EVENT_SSL_SERVERNAME    = 60204,
  TS_EVENT_SSL_VERIFY_SERVER = 60205,
  TS_EVENT_SSL_VERIFY_CLIENT = 60206,
  TS_EVENT_SSL_CLIENT_HELLO  = 60207,
  TS_EVENT_SSL_SECRET        = 60208,

  TS_EVENT_MGMT_UPDATE = 60300,
};
TSEvent const TS_EVENT_HTTP_READ_REQUEST_PRE_REMAP = TS_EVENT_HTTP_PRE_REMAP; /* backwards compat */

/**
    This set of enums represents the possible hooks where you can
    set up continuation callbacks. The functions used to register a
    continuation for a particular hook are:

    TSHttpHookAdd: adds a global hook. You can globally add
    any hook except for
     - TS_HTTP_REQUEST_TRANSFORM_HOOK
     - TS_HTTP_RESPONSE_TRANSFORM_HOOK
     - TS_HTTP_RESPONSE_CLIENT_HOOK
     - TS_HTTP_REQUEST_CLIENT_HOOK

    The following hooks can ONLY be added globally:
     - TS_HTTP_SELECT_ALT_HOOK
     - TS_HTTP_SSN_START_HOOK

    TSHttpSsnHookAdd: adds a transaction hook to each transaction
    within a session. You can only use transaction hooks with this call:
     - TS_HTTP_READ_REQUEST_HDR_HOOK
     - TS_HTTP_OS_DNS_HOOK
     - TS_HTTP_SEND_REQUEST_HDR_HOOK
     - TS_HTTP_READ_CACHE_HDR_HOOK
     - TS_HTTP_READ_RESPONSE_HDR_HOOK
     - TS_HTTP_SEND_RESPONSE_HDR_HOOK
     - TS_HTTP_REQUEST_TRANSFORM_HOOK
     - TS_HTTP_RESPONSE_TRANSFORM_HOOK
     - TS_HTTP_RESPONSE_CLIENT_HOOK
     - TS_HTTP_REQUEST_CLIENT_HOOK
     - TS_HTTP_TXN_START_HOOK
     - TS_HTTP_TXN_CLOSE_HOOK
     - TS_HTTP_SSN_CLOSE_HOOK

    TSHttpTxnHookAdd: adds a callback at a specific point within
    an HTTP transaction. The following hooks can be used with this
    function:
     - TS_HTTP_READ_REQUEST_HDR_HOOK
     - TS_HTTP_OS_DNS_HOOK
     - TS_HTTP_SEND_REQUEST_HDR_HOOK
     - TS_HTTP_READ_CACHE_HDR_HOOK
     - TS_HTTP_READ_RESPONSE_HDR_HOOK
     - TS_HTTP_SEND_RESPONSE_HDR_HOOK
     - TS_HTTP_REQUEST_TRANSFORM_HOOK
     - TS_HTTP_RESPONSE_TRANSFORM_HOOK
     - TS_HTTP_TXN_CLOSE_HOOK

    The two transform hooks can ONLY be added as transaction hooks.

    TS_VCONN_START_HOOK - called just after the connection is created,
    before other activity such as I/O or TLS handshakes  No handshake
    data has been read or sent (from the proxy) at this point

    TS_HTTP_LAST_HOOK _must_ be the last element. Only right place
    to insert a new element is just before TS_HTTP_LAST_HOOK.


    @note The TS_HTTP hooks below have to be in the same order as their
    corresponding TS_EVENT counterparts.  We use this in calculating the
    corresponding event from a hook ID by summing
    TS_EVENT_HTTP_READ_REQUEST_HDR with the hook ID (see the invoke call in
    HttpSM::state_api_callout). For example, the following expression must be
    true:

    TS_EVENT_HTTP_TXN_CLOSE == TS_EVENT_HTTP_READ_REQUEST_HDR + TS_HTTP_TXN_CLOSE_HOOK

 */
enum TSHttpHookID {
/*
   The following macro helps maintain the relationship between the TS_HTTP
   hooks and their TS_EVENT_HTTP counterparts as described in the above
   doxygen comment.
 */
#define DERIVE_HOOK_VALUE_FROM_EVENT(COMMON) TS_HTTP_##COMMON##_HOOK = TS_EVENT_HTTP_##COMMON - TS_EVENT_HTTP_READ_REQUEST_HDR
  DERIVE_HOOK_VALUE_FROM_EVENT(READ_REQUEST_HDR),             // TS_HTTP_READ_REQUEST_HDR_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(OS_DNS),                       // TS_HTTP_OS_DNS_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(SEND_REQUEST_HDR),             // TS_HTTP_SEND_REQUEST_HDR_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(READ_CACHE_HDR),               // TS_HTTP_READ_CACHE_HDR_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(READ_RESPONSE_HDR),            // TS_HTTP_READ_RESPONSE_HDR_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(SEND_RESPONSE_HDR),            // TS_HTTP_SEND_RESPONSE_HDR_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(REQUEST_TRANSFORM),            // TS_HTTP_REQUEST_TRANSFORM_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(RESPONSE_TRANSFORM),           // TS_HTTP_RESPONSE_TRANSFORM_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(SELECT_ALT),                   // TS_HTTP_SELECT_ALT_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(TXN_START),                    // TS_HTTP_TXN_START_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(TXN_CLOSE),                    // TS_HTTP_TXN_CLOSE_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(SSN_START),                    // TS_HTTP_SSN_START_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(SSN_CLOSE),                    // TS_HTTP_SSN_CLOSE_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(CACHE_LOOKUP_COMPLETE),        // TS_HTTP_CACHE_LOOKUP_COMPLETE_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(PRE_REMAP),                    // TS_HTTP_PRE_REMAP_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(POST_REMAP),                   // TS_HTTP_POST_REMAP_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(REQUEST_BUFFER_READ_COMPLETE), // TS_HTTP_REQUEST_BUFFER_READ_COMPLETE_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(RESPONSE_CLIENT),              // TS_HTTP_RESPONSE_CLIENT_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(REQUEST_CLIENT),               // TS_HTTP_REQUEST_CLIENT_HOOK
  DERIVE_HOOK_VALUE_FROM_EVENT(TUNNEL_START),                 // TS_HTTP_TUNNEL_START_HOOK

// NOTE:
// If adding any TS_HTTP hooks, be sure to understand the note above in the
// doxygen comment about the ordering of these enum values with respect to
// their corresponding TS_EVENT values.
#undef DERIVE_HOOK_VALUE_FROM_EVENT

  // Putting the SSL hooks in the same enum space
  // So both sets of hooks can be set by the same Hook function
  TS_SSL_FIRST_HOOK,
  TS_VCONN_START_HOOK      = TS_SSL_FIRST_HOOK,
  TS_VCONN_PRE_ACCEPT_HOOK = TS_VCONN_START_HOOK, // Deprecated but compatible for now.
  TS_VCONN_CLOSE_HOOK,
  TS_SSL_CLIENT_HELLO_HOOK,
  TS_SSL_SNI_HOOK,
  TS_SSL_CERT_HOOK = TS_SSL_SNI_HOOK,
  TS_SSL_SERVERNAME_HOOK,
  TS_SSL_SERVER_VERIFY_HOOK,
  TS_SSL_VERIFY_SERVER_HOOK = TS_SSL_SERVER_VERIFY_HOOK,
  TS_SSL_VERIFY_CLIENT_HOOK,
  TS_SSL_SESSION_HOOK,
  TS_VCONN_OUTBOUND_START_HOOK,
  TS_VCONN_OUTBOUND_CLOSE_HOOK,
  TS_SSL_LAST_HOOK = TS_VCONN_OUTBOUND_CLOSE_HOOK,
  TS_HTTP_LAST_HOOK,
};

/** Plugin lifecycle hooks.

    These are called during lifecycle events of a plugin. They
    should be set in the plugin initialization function. The
    continuation is invoked with an event ID specified for each hook
    and @c nullptr for the event data.

    TS_LIFECYCLE_PORTS_INITIALIZED_HOOK

      called once, after the HTTP proxy port data structures have
      been initialized. In particular, SSL related calls that depend
      on accept endpoints may be invoked. After this hook is
      finished, the proxy port sockets are opened and connections
      are accepted.

      Event: TS_EVENT_LIFECYCLE_PORTS_INITIALIZED

    TS_LIFECYCLE_PORTS_READY_HOOK

      called once, after the sockets have been opened and the accept
      threads have been started. That is, the ports are ready to
      accept connections. This is *not* guaranteed to be called
      before the first connection is accepted.

      Event: TS_EVENT_LIFECYCLE_PORTS_READY

    TS_LIFECYCLE_CACHE_READY_HOOK

      called once, after the cache has finished its
      initialization. It is either online or has failed when this
      hook is called.

      Event: TS_EVENT_LIFECYCLE_CACHE_READY

    TS_LIFECYCLE_SERVER_SSL_CTX_INITIALIZED_HOOK

      called every time after a server SSL_CTX has finished the initialization.
      It exposes the initialized SSL_CTX pointer.

      Event: TS_EVENT_LIFECYCLE_SERVER_SSL_CTX_INITIALIZED

    TS_LIFECYCLE_CLIENT_SSL_CTX_INITIALIZED_HOOK

      called once, after the client SSL_CTX has finished the initialization.
      It exposes the initialized SSL_CTX pointer.

      Event: TS_EVENT_LIFECYCLE_CLIENT_SSL_CTX_INITIALIZED

    TS_LIFECYCLE_MSG_HOOK

      Called in response to an external agent. The data is a pointer to  an instance of TSPluginMsg.

      Event: TS_EVENT_LIFECYCLE_MSG

    TS_LIFECYCLE_TASK_THREADS_READY_HOOK

      called once, after the task threads have been started.

      Event: TS_EVENT_LIFECYCLE_TASK_THREADS_READY

    TS_LIFECYCLE_SHUTDOWN_HOOK

      called once, after receiving a shutdown signal, such as SIGTERM.

      Event: TS_EVENT_LIFECYCLE_SHUTDOWN

    Ordering guarantees:

    - TS_LIFECYCLE_PORTS_INITIALIZED_HOOK before TS_LIFECYCLE_PORTS_READY_HOOK.

    NOTE! ONLY the orderings EXPLICITLY mentioned above are guaranteed.

 */
enum TSLifecycleHookID {
  TS_LIFECYCLE_PORTS_INITIALIZED_HOOK,
  TS_LIFECYCLE_PORTS_READY_HOOK,
  TS_LIFECYCLE_CACHE_READY_HOOK,
  TS_LIFECYCLE_SERVER_SSL_CTX_INITIALIZED_HOOK,
  TS_LIFECYCLE_CLIENT_SSL_CTX_INITIALIZED_HOOK,
  TS_LIFECYCLE_MSG_HOOK,
  TS_LIFECYCLE_TASK_THREADS_READY_HOOK,
  TS_LIFECYCLE_SHUTDOWN_HOOK,
  TS_LIFECYCLE_SSL_SECRET_HOOK,
  TS_LIFECYCLE_LAST_HOOK,
};

enum TSServerState {
  TS_SRVSTATE_STATE_UNDEFINED = 0,
  TS_SRVSTATE_ACTIVE_TIMEOUT,
  TS_SRVSTATE_BAD_INCOMING_RESPONSE,
  TS_SRVSTATE_CONNECTION_ALIVE,
  TS_SRVSTATE_CONNECTION_CLOSED,
  TS_SRVSTATE_CONNECTION_ERROR,
  TS_SRVSTATE_INACTIVE_TIMEOUT,
  TS_SRVSTATE_OPEN_RAW_ERROR,
  TS_SRVSTATE_PARSE_ERROR,
  TS_SRVSTATE_TRANSACTION_COMPLETE,
  TS_SRVSTATE_PARENT_RETRY,
  TS_SRVSTATE_OUTBOUND_CONGESTION,
};

enum TSLookingUpType {
  TS_LOOKUP_UNDEFINED_LOOKUP,
  TS_LOOKUP_PARENT_PROXY,
  TS_LOOKUP_ORIGIN_SERVER,
  TS_LOOKUP_INCOMING_ROUTER,
  TS_LOOKUP_HOST_NONE,
};

enum TSCacheLookupResult {
  TS_CACHE_LOOKUP_MISS,
  TS_CACHE_LOOKUP_HIT_STALE,
  TS_CACHE_LOOKUP_HIT_FRESH,
  TS_CACHE_LOOKUP_SKIPPED,
};

enum TSCacheDataType {
  TS_CACHE_DATA_TYPE_NONE,
  TS_CACHE_DATA_TYPE_HTTP,
  TS_CACHE_DATA_TYPE_OTHER,
};

enum TSCacheError {
  TS_CACHE_ERROR_NO_DOC    = -20400,
  TS_CACHE_ERROR_DOC_BUSY  = -20401,
  TS_CACHE_ERROR_NOT_READY = -20407,
};

enum TSCacheScanResult {
  TS_CACHE_SCAN_RESULT_DONE     = 0,
  TS_CACHE_SCAN_RESULT_CONTINUE = 1,
  TS_CACHE_SCAN_RESULT_DELETE   = 10,
  TS_CACHE_SCAN_RESULT_DELETE_ALL_ALTERNATES,
  TS_CACHE_SCAN_RESULT_UPDATE,
  TS_CACHE_SCAN_RESULT_RETRY,
};

enum TSHttpTxnInfoKey {
  TS_TXN_INFO_NONE = -1,
  TS_TXN_INFO_CACHE_HIT_RAM,
  TS_TXN_INFO_CACHE_COMPRESSED_IN_RAM,
  TS_TXN_INFO_CACHE_HIT_RWW, // READ_WHILE_WRITE
  TS_TXN_INFO_CACHE_OPEN_READ_TRIES,
  TS_TXN_INFO_CACHE_OPEN_WRITE_TRIES,
  TS_TXN_INFO_CACHE_VOLUME,
  TS_TXN_INFO_LAST_ENTRY,
};

enum TSHttpSsnInfoKey {
  TS_SSN_INFO_NONE = -1,
  TS_SSN_INFO_TRANSACTION_COUNT,
  TS_SSN_INFO_RECEIVED_FRAME_COUNT,
};

enum TSVConnPPInfoKey {
  TS_PP_INFO_VERSION = 0x100,
  TS_PP_INFO_SRC_ADDR,
  TS_PP_INFO_SRC_PORT,
  TS_PP_INFO_DST_ADDR,
  TS_PP_INFO_DST_PORT,
  TS_PP_INFO_PROTOCOL,
  TS_PP_INFO_SOCK_TYPE,
};

#define TS_SSN_INFO_RECEIVED_FRAME_COUNT_H2_UNKNOWN 999
#define TS_SSN_INFO_RECEIVED_FRAME_COUNT_H3_UNKNOWN 0x21

enum TSVConnCloseFlags {
  TS_VC_CLOSE_ABORT  = -1,
  TS_VC_CLOSE_NORMAL = 1,
};

enum TSIOBufferSizeIndex {
  TS_IOBUFFER_SIZE_INDEX_128  = 0,
  TS_IOBUFFER_SIZE_INDEX_256  = 1,
  TS_IOBUFFER_SIZE_INDEX_512  = 2,
  TS_IOBUFFER_SIZE_INDEX_1K   = 3,
  TS_IOBUFFER_SIZE_INDEX_2K   = 4,
  TS_IOBUFFER_SIZE_INDEX_4K   = 5,
  TS_IOBUFFER_SIZE_INDEX_8K   = 6,
  TS_IOBUFFER_SIZE_INDEX_16K  = 7,
  TS_IOBUFFER_SIZE_INDEX_32K  = 8,
  TS_IOBUFFER_SIZE_INDEX_64K  = 9,
  TS_IOBUFFER_SIZE_INDEX_128K = 10,
  TS_IOBUFFER_SIZE_INDEX_256K = 11,
  TS_IOBUFFER_SIZE_INDEX_512K = 12,
  TS_IOBUFFER_SIZE_INDEX_1M   = 13,
  TS_IOBUFFER_SIZE_INDEX_2M   = 14,
};

enum TSIOBufferWaterMark {
  TS_IOBUFFER_WATER_MARK_UNDEFINED         = -1,
  TS_IOBUFFER_WATER_MARK_PLUGIN_VC_DEFAULT = 0,     // mirror of DEFAULT_PLUGIN_VC_BUFFER_WATER_MARK
  TS_IOBUFFER_WATER_MARK_HTTP_DEFAULT      = 32768, // mirror of default_buffer_water_mark
};

enum TSReturnCode {
  TS_ERROR   = -1,
  TS_SUCCESS = 0,
};

enum TSFetchWakeUpOptions {
  NO_CALLBACK = 0,
  AFTER_HEADER,
  AFTER_BODY,
};

/// Values for per server outbound connection tracking group definition.
/// See proxy.config.http.per_server.match
enum TSOutboundConnectionMatchType {
  TS_SERVER_OUTBOUND_MATCH_IP,
  TS_SERVER_OUTBOUND_MATCH_PORT,
  TS_SERVER_OUTBOUND_MATCH_HOST,
  TS_SERVER_OUTBOUND_MATCH_BOTH,
};

/* librecords types */

/* The values of this enum must match enum RecT in I_RecDefs.h */
enum TSRecordType {
  TS_RECORDTYPE_NULL    = 0x00,
  TS_RECORDTYPE_CONFIG  = 0x01,
  TS_RECORDTYPE_PROCESS = 0x02,
  TS_RECORDTYPE_NODE    = 0x04,
  TS_RECORDTYPE_PLUGIN  = 0x20,
  TS_RECORDTYPE_ALL     = 0x3F,
};

/* The values of this enum must match enum RecDataT in I_RecDefs.h */
enum TSRecordDataType {
  TS_RECORDDATATYPE_NULL = 0,
  TS_RECORDDATATYPE_INT,
  TS_RECORDDATATYPE_FLOAT,
  TS_RECORDDATATYPE_STRING,
  TS_RECORDDATATYPE_COUNTER,
  TS_RECORDDATATYPE_STAT_CONST,
  TS_RECORDDATATYPE_STAT_FX,
  TS_RECORDDATATYPE_MAX,
};

union TSRecordData {
  int64_t rec_int;
  float   rec_float;
  char   *rec_string;
  int64_t rec_counter;
};

/* The values of this enum must match enum RecPersistT in I_RecDefs.h */
enum TSRecordPersistType {
  TS_RECORDP_NULL,
  TS_RECORDP_PERSISTENT,
  TS_RECORDP_NON_PERSISTENT,
};

/* The values of this enum must match enum RecUpdateT in I_RecDefs.h */
enum TSRecordUpdateType {
  TS_RECORDUPDATE_NULL,
  TS_RECORDUPDATE_DYNAMIC,
  TS_RECORDUPDATE_RESTART_TS,
};

/* The values of this enum must match enum RecCheckT in I_RecDefs.h */
enum TSRecordCheckType {
  TS_RECORDCHECK_NULL,
  TS_RECORDCHECK_STR,
  TS_RECORDCHECK_INT,
  TS_RECORDCHECK_IP,
};

/* The values of this enum must match enum RecAccessT in I_RecDefs.h */
enum TSRecordAccessType {
  TS_RECORDACCESS_NULL,
  TS_RECORDACCESS_NO_ACCESS,
  TS_RECORDACCESS_READ_ONLY,
};

enum TSOverridableConfigKey {
  TS_CONFIG_NULL = -1,
  TS_CONFIG_URL_REMAP_PRISTINE_HOST_HDR,
  TS_CONFIG_HTTP_CHUNKING_ENABLED,
  TS_CONFIG_HTTP_NEGATIVE_CACHING_ENABLED,
  TS_CONFIG_HTTP_NEGATIVE_CACHING_LIFETIME,
  TS_CONFIG_HTTP_CACHE_WHEN_TO_REVALIDATE,
  TS_CONFIG_HTTP_KEEP_ALIVE_ENABLED_IN,
  TS_CONFIG_HTTP_KEEP_ALIVE_ENABLED_OUT,
  TS_CONFIG_HTTP_KEEP_ALIVE_POST_OUT,
  TS_CONFIG_HTTP_SERVER_SESSION_SHARING_MATCH,
  TS_CONFIG_NET_SOCK_RECV_BUFFER_SIZE_OUT,
  TS_CONFIG_NET_SOCK_SEND_BUFFER_SIZE_OUT,
  TS_CONFIG_NET_SOCK_OPTION_FLAG_OUT,
  TS_CONFIG_HTTP_FORWARD_PROXY_AUTH_TO_PARENT,
  TS_CONFIG_HTTP_ANONYMIZE_REMOVE_FROM,
  TS_CONFIG_HTTP_ANONYMIZE_REMOVE_REFERER,
  TS_CONFIG_HTTP_ANONYMIZE_REMOVE_USER_AGENT,
  TS_CONFIG_HTTP_ANONYMIZE_REMOVE_COOKIE,
  TS_CONFIG_HTTP_ANONYMIZE_REMOVE_CLIENT_IP,
  TS_CONFIG_HTTP_ANONYMIZE_INSERT_CLIENT_IP,
  TS_CONFIG_HTTP_RESPONSE_SERVER_ENABLED,
  TS_CONFIG_HTTP_INSERT_SQUID_X_FORWARDED_FOR,
  TS_CONFIG_HTTP_SEND_HTTP11_REQUESTS,
  TS_CONFIG_HTTP_CACHE_HTTP,
  TS_CONFIG_HTTP_CACHE_IGNORE_CLIENT_NO_CACHE,
  TS_CONFIG_HTTP_CACHE_IGNORE_CLIENT_CC_MAX_AGE,
  TS_CONFIG_HTTP_CACHE_IMS_ON_CLIENT_NO_CACHE,
  TS_CONFIG_HTTP_CACHE_IGNORE_SERVER_NO_CACHE,
  TS_CONFIG_HTTP_CACHE_CACHE_RESPONSES_TO_COOKIES,
  TS_CONFIG_HTTP_CACHE_IGNORE_AUTHENTICATION,
  TS_CONFIG_HTTP_CACHE_CACHE_URLS_THAT_LOOK_DYNAMIC,
  TS_CONFIG_HTTP_CACHE_REQUIRED_HEADERS,
  TS_CONFIG_HTTP_INSERT_REQUEST_VIA_STR,
  TS_CONFIG_HTTP_INSERT_RESPONSE_VIA_STR,
  TS_CONFIG_HTTP_CACHE_HEURISTIC_MIN_LIFETIME,
  TS_CONFIG_HTTP_CACHE_HEURISTIC_MAX_LIFETIME,
  TS_CONFIG_HTTP_CACHE_GUARANTEED_MIN_LIFETIME,
  TS_CONFIG_HTTP_CACHE_GUARANTEED_MAX_LIFETIME,
  TS_CONFIG_HTTP_CACHE_MAX_STALE_AGE,
  TS_CONFIG_HTTP_KEEP_ALIVE_NO_ACTIVITY_TIMEOUT_IN,
  TS_CONFIG_HTTP_KEEP_ALIVE_NO_ACTIVITY_TIMEOUT_OUT,
  TS_CONFIG_HTTP_TRANSACTION_NO_ACTIVITY_TIMEOUT_IN,
  TS_CONFIG_HTTP_TRANSACTION_NO_ACTIVITY_TIMEOUT_OUT,
  TS_CONFIG_HTTP_TRANSACTION_ACTIVE_TIMEOUT_OUT,
  TS_CONFIG_HTTP_CONNECT_ATTEMPTS_MAX_RETRIES,
  TS_CONFIG_HTTP_CONNECT_ATTEMPTS_MAX_RETRIES_DOWN_SERVER,
  TS_CONFIG_HTTP_CONNECT_ATTEMPTS_RR_RETRIES,
  TS_CONFIG_HTTP_CONNECT_ATTEMPTS_TIMEOUT,
  TS_CONFIG_HTTP_DOWN_SERVER_CACHE_TIME,
  TS_CONFIG_HTTP_DOC_IN_CACHE_SKIP_DNS,
  TS_CONFIG_HTTP_BACKGROUND_FILL_ACTIVE_TIMEOUT,
  TS_CONFIG_HTTP_RESPONSE_SERVER_STR,
  TS_CONFIG_HTTP_CACHE_HEURISTIC_LM_FACTOR,
  TS_CONFIG_HTTP_BACKGROUND_FILL_COMPLETED_THRESHOLD,
  TS_CONFIG_NET_SOCK_PACKET_MARK_OUT,
  TS_CONFIG_NET_SOCK_PACKET_TOS_OUT,
  TS_CONFIG_HTTP_INSERT_AGE_IN_RESPONSE,
  TS_CONFIG_HTTP_CHUNKING_SIZE,
  TS_CONFIG_HTTP_FLOW_CONTROL_ENABLED,
  TS_CONFIG_HTTP_FLOW_CONTROL_LOW_WATER_MARK,
  TS_CONFIG_HTTP_FLOW_CONTROL_HIGH_WATER_MARK,
  TS_CONFIG_HTTP_CACHE_RANGE_LOOKUP,
  TS_CONFIG_HTTP_DEFAULT_BUFFER_SIZE,
  TS_CONFIG_HTTP_DEFAULT_BUFFER_WATER_MARK,
  TS_CONFIG_HTTP_REQUEST_HEADER_MAX_SIZE,
  TS_CONFIG_HTTP_RESPONSE_HEADER_MAX_SIZE,
  TS_CONFIG_HTTP_NEGATIVE_REVALIDATING_ENABLED,
  TS_CONFIG_HTTP_NEGATIVE_REVALIDATING_LIFETIME,
  TS_CONFIG_SSL_HSTS_MAX_AGE,
  TS_CONFIG_SSL_HSTS_INCLUDE_SUBDOMAINS,
  TS_CONFIG_HTTP_CACHE_OPEN_READ_RETRY_TIME,
  TS_CONFIG_HTTP_CACHE_MAX_OPEN_READ_RETRIES,
  TS_CONFIG_HTTP_CACHE_RANGE_WRITE,
  TS_CONFIG_HTTP_POST_CHECK_CONTENT_LENGTH_ENABLED,
  TS_CONFIG_HTTP_GLOBAL_USER_AGENT_HEADER,
  TS_CONFIG_HTTP_AUTH_SERVER_SESSION_PRIVATE,
  TS_CONFIG_HTTP_SLOW_LOG_THRESHOLD,
  TS_CONFIG_HTTP_CACHE_GENERATION,
  TS_CONFIG_BODY_FACTORY_TEMPLATE_BASE,
  TS_CONFIG_HTTP_CACHE_OPEN_WRITE_FAIL_ACTION,
  TS_CONFIG_HTTP_NUMBER_OF_REDIRECTIONS,
  TS_CONFIG_HTTP_CACHE_MAX_OPEN_WRITE_RETRIES,
  TS_CONFIG_HTTP_CACHE_MAX_OPEN_WRITE_RETRY_TIMEOUT,
  TS_CONFIG_HTTP_REDIRECT_USE_ORIG_CACHE_KEY,
  TS_CONFIG_HTTP_ATTACH_SERVER_SESSION_TO_CLIENT,
  TS_CONFIG_WEBSOCKET_NO_ACTIVITY_TIMEOUT,
  TS_CONFIG_WEBSOCKET_ACTIVE_TIMEOUT,
  TS_CONFIG_HTTP_UNCACHEABLE_REQUESTS_BYPASS_PARENT,
  TS_CONFIG_HTTP_PARENT_PROXY_TOTAL_CONNECT_ATTEMPTS,
  TS_CONFIG_HTTP_TRANSACTION_ACTIVE_TIMEOUT_IN,
  TS_CONFIG_SRV_ENABLED,
  TS_CONFIG_HTTP_FORWARD_CONNECT_METHOD,
  TS_CONFIG_SSL_CERT_FILENAME,
  TS_CONFIG_SSL_CLIENT_CERT_FILENAME = TS_CONFIG_SSL_CERT_FILENAME,
  TS_CONFIG_SSL_CERT_FILEPATH,
  TS_CONFIG_PARENT_FAILURES_UPDATE_HOSTDB,
  TS_CONFIG_HTTP_CACHE_IGNORE_ACCEPT_MISMATCH,
  TS_CONFIG_HTTP_CACHE_IGNORE_ACCEPT_LANGUAGE_MISMATCH,
  TS_CONFIG_HTTP_CACHE_IGNORE_ACCEPT_ENCODING_MISMATCH,
  TS_CONFIG_HTTP_CACHE_IGNORE_ACCEPT_CHARSET_MISMATCH,
  TS_CONFIG_HTTP_PARENT_PROXY_FAIL_THRESHOLD,
  TS_CONFIG_HTTP_PARENT_PROXY_RETRY_TIME,
  TS_CONFIG_HTTP_PER_PARENT_CONNECT_ATTEMPTS,
  TS_CONFIG_HTTP_NORMALIZE_AE,
  TS_CONFIG_HTTP_INSERT_FORWARDED,
  TS_CONFIG_HTTP_PROXY_PROTOCOL_OUT,
  TS_CONFIG_HTTP_ALLOW_MULTI_RANGE,
  TS_CONFIG_HTTP_REQUEST_BUFFER_ENABLED,
  TS_CONFIG_HTTP_ALLOW_HALF_OPEN,
  TS_CONFIG_HTTP_SERVER_MIN_KEEP_ALIVE_CONNS,
  TS_CONFIG_HTTP_PER_SERVER_CONNECTION_MAX,
  TS_CONFIG_HTTP_PER_SERVER_CONNECTION_MATCH,
  TS_CONFIG_SSL_CLIENT_VERIFY_SERVER_POLICY,
  TS_CONFIG_SSL_CLIENT_VERIFY_SERVER_PROPERTIES,
  TS_CONFIG_SSL_CLIENT_SNI_POLICY,
  TS_CONFIG_SSL_CLIENT_PRIVATE_KEY_FILENAME,
  TS_CONFIG_SSL_CLIENT_CA_CERT_FILENAME,
  TS_CONFIG_SSL_CLIENT_ALPN_PROTOCOLS,
  TS_CONFIG_HTTP_HOST_RESOLUTION_PREFERENCE,
  TS_CONFIG_HTTP_CONNECT_DOWN_POLICY,
  TS_CONFIG_HTTP_MAX_PROXY_CYCLES,
  TS_CONFIG_PLUGIN_VC_DEFAULT_BUFFER_INDEX,
  TS_CONFIG_PLUGIN_VC_DEFAULT_BUFFER_WATER_MARK,
  TS_CONFIG_NET_SOCK_NOTSENT_LOWAT,
  TS_CONFIG_BODY_FACTORY_RESPONSE_SUPPRESSION_MODE,
  TS_CONFIG_HTTP_ENABLE_PARENT_TIMEOUT_MARKDOWNS,
  TS_CONFIG_HTTP_DISABLE_PARENT_MARKDOWNS,
  TS_CONFIG_NET_DEFAULT_INACTIVITY_TIMEOUT,
  TS_CONFIG_HTTP_NO_DNS_JUST_FORWARD_TO_PARENT,
  TS_CONFIG_HTTP_CACHE_IGNORE_QUERY,
  TS_CONFIG_HTTP_DROP_CHUNKED_TRAILERS,
  TS_CONFIG_HTTP_STRICT_CHUNK_PARSING,
  TS_CONFIG_HTTP_NEGATIVE_CACHING_LIST,
  TS_CONFIG_HTTP_CONNECT_ATTEMPTS_RETRY_BACKOFF_BASE,
  TS_CONFIG_HTTP_NEGATIVE_REVALIDATING_LIST,
  TS_CONFIG_HTTP_CACHE_POST_METHOD,
  TS_CONFIG_LAST_ENTRY,
};

/* The TASK pool of threads is the primary method of off-loading continuations from the
   net-threads. Configure this with proxy.config.task_threads in records.yaml. */
enum TSThreadPool {
  TS_THREAD_POOL_NET,
  TS_THREAD_POOL_TASK,
  /* unlikely you should use these */
  TS_THREAD_POOL_DNS,
  TS_THREAD_POOL_UDP,
};

/* TSHRTime stuff, this is a candidate for deprecation in v10.0.0 */
using TSHRTime = int64_t;

TSHRTime const TS_HRTIME_NSECOND = 1;
TSHRTime const TS_HRTIME_USECOND = 1000 * TS_HRTIME_NSECOND;
TSHRTime const TS_HRTIME_MSECOND = 1000 * TS_HRTIME_USECOND;
TSHRTime const TS_HRTIME_SECOND  = 1000 * TS_HRTIME_MSECOND;

constexpr TSHRTime
TS_HRTIME_SECONDS(TSHRTime x)
{
  return x * TS_HRTIME_SECOND;
}
constexpr TSHRTime
TS_HRTIME_MSECONDS(TSHRTime x)
{
  return x * TS_HRTIME_MSECOND;
}
constexpr TSHRTime
TS_HRTIME_USECONDS(TSHRTime x)
{
  return x * TS_HRTIME_USECOND;
}
constexpr TSHRTime
TS_HRTIME_NSECONDS(TSHRTime x)
{
  return x * TS_HRTIME_NSECOND;
}

/* The TSMilestonesType is an enum defining all the various milestones ("timers") that
   we track for a request. */
enum TSMilestonesType {
  TS_MILESTONE_NULL = -1,
  TS_MILESTONE_UA_BEGIN,
  TS_MILESTONE_UA_FIRST_READ,
  TS_MILESTONE_UA_READ_HEADER_DONE,
  TS_MILESTONE_UA_BEGIN_WRITE,
  TS_MILESTONE_UA_CLOSE,
  TS_MILESTONE_SERVER_FIRST_CONNECT,
  TS_MILESTONE_SERVER_CONNECT,
  TS_MILESTONE_SERVER_CONNECT_END,
  TS_MILESTONE_SERVER_BEGIN_WRITE,
  TS_MILESTONE_SERVER_FIRST_READ,
  TS_MILESTONE_SERVER_READ_HEADER_DONE,
  TS_MILESTONE_SERVER_CLOSE,
  TS_MILESTONE_CACHE_OPEN_READ_BEGIN,
  TS_MILESTONE_CACHE_OPEN_READ_END,
  TS_MILESTONE_CACHE_OPEN_WRITE_BEGIN,
  TS_MILESTONE_CACHE_OPEN_WRITE_END,
  TS_MILESTONE_DNS_LOOKUP_BEGIN,
  TS_MILESTONE_DNS_LOOKUP_END,
  TS_MILESTONE_SM_START,
  TS_MILESTONE_SM_FINISH,
  TS_MILESTONE_PLUGIN_ACTIVE,
  TS_MILESTONE_PLUGIN_TOTAL,
  TS_MILESTONE_TLS_HANDSHAKE_START,
  TS_MILESTONE_TLS_HANDSHAKE_END,
  TS_MILESTONE_LAST_ENTRY,
};

/* These type aliases are used with the corresponding TSMgmt*Get functions
   for storing the values retrieved by those functions. For example,
   TSMgmtCounterGet() retrieves an TSMgmtCounter. */
using TSMgmtInt     = int64_t;
using TSMgmtCounter = int64_t;
using TSMgmtFloat   = float;
using TSMgmtString  = char *;

/// The source of a management value.
enum TSMgmtSource {
  TS_MGMT_SOURCE_NULL,     ///< No source / value not found.
  TS_MGMT_SOURCE_DEFAULT,  ///< Built in core default.
  TS_MGMT_SOURCE_PLUGIN,   ///< Plugin supplied default.
  TS_MGMT_SOURCE_EXPLICIT, ///< Set by administrator (config file, external API, etc.)
  TS_MGMT_SOURCE_ENV,      ///< Process environment variable.
};

/// The User Arg type, used for Txn/Ssn/VConn user argument slots
enum TSUserArgType {
  TS_USER_ARGS_TXN,   ///< Transaction based.
  TS_USER_ARGS_SSN,   ///< Session based
  TS_USER_ARGS_VCONN, ///< VConnection based
  TS_USER_ARGS_GLB,   ///< Global based
  TS_USER_ARGS_COUNT, ///< Fake enum, # of valid entries.
};

/** An enumeration of HTTP version types for the priority functions that behave
 * differently across HTTP protocols. */
enum TSHttpPriorityType {
  HTTP_PRIORITY_TYPE_HTTP_UNSPECIFIED = 1,
  HTTP_PRIORITY_TYPE_HTTP_2,
  HTTP_PRIORITY_TYPE_HTTP_3,
};

/** The abstract type of the various HTTP priority implementations. */
struct TSHttpPriority {
  /** The reference to the concrete HTTP priority implementation. This will be
   * a value from TSHttpPriorityType. */
  uint8_t priority_type;
  /** The space allocated for the concrete priority implementation.
   *
   * Note that this has to take padding into account. There is a static_assert
   * in InkAPI.cc to verify that TSHttpPriority is at least as large as
   * TSHttp2Priority. As other structures are added that are represented by
   * TSHttpPriority add more static_asserts to verify that TSHttpPriority is as
   * large as it needs to be.
   */
  uint8_t data[7];
};

/** A structure for HTTP/2 priority.
 *
 * For an explanation of these terms with respect to HTTP/2, see RFC 7540,
 * section 5.3.
 */
struct TSHttp2Priority {
  uint8_t priority_type; /** HTTP_PROTOCOL_TYPE_HTTP_2 */
  uint8_t weight;
  /** The stream dependency. Per spec, see RFC 7540 section 6.2, this is 31
   * bits. We use a signed 32 bit structure to store either a valid dependency
   * or -1 if the stream has no dependency. */
  int32_t stream_dependency;
};

using TSFile = struct tsapi_file *;

using TSMLoc          = struct tsapi_mloc *;
using TSMBuffer       = struct tsapi_mbuffer *;
using TSHttpSsn       = struct tsapi_httpssn *;
using TSHttpTxn       = struct tsapi_httptxn *;
using TSSslConnection = struct tsapi_ssl_obj *;
using TSSslSession    = struct tsapi_ssl_session *;
using TSHttpAltInfo   = struct tsapi_httpaltinfo *;
using TSMimeParser    = struct tsapi_mimeparser *;
using TSHttpParser    = struct tsapi_httpparser *;
using TSCacheKey      = struct tsapi_cachekey *;
using TSCacheHttpInfo = struct tsapi_cachehttpinfo *;
using TSCacheTxn      = struct tsapi_cachetxn *;
using TSSslVerifyCTX  = struct tsapi_x509_store_ctx *;

using TSPortDescriptor   = struct tsapi_port *;
using TSVIO              = struct tsapi_vio *;
using TSThread           = struct tsapi_thread *;
using TSEventThread      = struct tsapi_event_thread *;
using TSSslX509          = struct tsapi_x509 *;
using TSMutex            = struct tsapi_mutex *;
using TSConfig           = struct tsapi_config *;
using TSCont             = struct tsapi_cont *;
using TSVConn            = struct tsapi_cont *; /* a VConn is really a specialized TSCont */
using TSSslContext       = struct tsapi_ssl_context *;
using TSAction           = struct tsapi_action *;
using TSIOBuffer         = struct tsapi_iobuffer *;
using TSIOBufferData     = struct tsapi_iobufferdata *;
using TSIOBufferBlock    = struct tsapi_bufferblock *;
using TSIOBufferReader   = struct tsapi_bufferreader *;
using TSHostLookupResult = struct tsapi_hostlookupresult *;
using TSAIOCallback      = struct tsapi_aiocallback *;
using TSAcceptor         = struct tsapi_net_accept *;
using TSRemapPluginInfo  = struct tsapi_remap_plugin_info *;
using TSClientHello      = struct tsapi_ssl_client_hello *;

using TSFetchSM = struct tsapi_fetchsm *;

using TSThreadFunc        = void *(*)(void *data);
using TSEventFunc         = int (*)(TSCont contp, TSEvent event, void *edata);
using TSConfigDestroyFunc = void (*)(void *data);

struct TSFetchEvent {
  int success_event_id;
  int failure_event_id;
  int timeout_event_id;
};

struct TSFetchUrlParams {
  const char              *request;
  int                      request_len;
  int                      port;
  struct sockaddr_storage  ip;
  TSCont                   contp;
  TSFetchEvent             events;
  TSFetchWakeUpOptions     options;
  struct TSFetchUrlParams *next;
};
using TSFetchUrlParams_t = TSFetchUrlParams;

// Extended FetchSM APIs
enum TSFetchEventExt {
  TS_FETCH_EVENT_EXT_HEAD_READY = -1,
  TS_FETCH_EVENT_EXT_HEAD_DONE  = -2,
  TS_FETCH_EVENT_EXT_BODY_READY = -3,
  TS_FETCH_EVENT_EXT_BODY_DONE  = -4,
};

enum TSFetchFlags {
  TS_FETCH_FLAGS_NONE                 = 0,      // do nothing
  TS_FETCH_FLAGS_STREAM               = 1 << 1, // enable stream IO
  TS_FETCH_FLAGS_DECHUNK              = 1 << 2, // dechunk body content
  TS_FETCH_FLAGS_NEWLOCK              = 1 << 3, // allocate new lock for fetch sm
  TS_FETCH_FLAGS_NOT_INTERNAL_REQUEST = 1 << 4, // Allow this fetch to be created as a non-internal request.
  TS_FETCH_FLAGS_SKIP_REMAP           = 1 << 5, // Skip remapping and allow requesting arbitary URL
};

// This is a duplicate of the SSL_MAX_SSL_SESSION_ID_LENGTH constant
// Redefining here so we don't include the openssl/ssl.h file here
const int TS_SSL_MAX_SSL_SESSION_ID_LENGTH = 32;

// This mirrors the internal data structure SSLSessionID
struct TSSslSessionID {
  size_t len;
  char   bytes[TS_SSL_MAX_SSL_SESSION_ID_LENGTH];
};

struct TSSecretID {
  const char *cert_name;
  size_t      cert_name_len;
  const char *key_name;
  size_t      key_name_len;
};

enum TSConnectType {
  TS_CONNECT_UNDEFINED,
  TS_CONNECT_PLUGIN,
  TS_CONNECT_LAST_ENTRY,
};

struct TSHttpConnectOptions {
  TSConnectType          connect_type;
  struct sockaddr const *addr;
  const char            *tag;
  int64_t                id;
  TSIOBufferSizeIndex    buffer_index;
  TSIOBufferWaterMark    buffer_water_mark;
};

/* --------------------------------------------------------------------------
   URL schemes */
extern const char *TS_URL_SCHEME_FILE;
extern const char *TS_URL_SCHEME_FTP;
extern const char *TS_URL_SCHEME_GOPHER;
extern const char *TS_URL_SCHEME_HTTP;
extern const char *TS_URL_SCHEME_HTTPS;
extern const char *TS_URL_SCHEME_MAILTO;
extern const char *TS_URL_SCHEME_NEWS;
extern const char *TS_URL_SCHEME_NNTP;
extern const char *TS_URL_SCHEME_PROSPERO;
extern const char *TS_URL_SCHEME_TELNET;
extern const char *TS_URL_SCHEME_TUNNEL;
extern const char *TS_URL_SCHEME_WAIS;
extern const char *TS_URL_SCHEME_PNM;
extern const char *TS_URL_SCHEME_RTSP;
extern const char *TS_URL_SCHEME_RTSPU;
extern const char *TS_URL_SCHEME_MMS;
extern const char *TS_URL_SCHEME_MMSU;
extern const char *TS_URL_SCHEME_MMST;
extern const char *TS_URL_SCHEME_WS;
extern const char *TS_URL_SCHEME_WSS;

/* --------------------------------------------------------------------------
   URL scheme string lengths */
extern int TS_URL_LEN_FILE;
extern int TS_URL_LEN_FTP;
extern int TS_URL_LEN_GOPHER;
extern int TS_URL_LEN_HTTP;
extern int TS_URL_LEN_HTTPS;
extern int TS_URL_LEN_MAILTO;
extern int TS_URL_LEN_NEWS;
extern int TS_URL_LEN_NNTP;
extern int TS_URL_LEN_PROSPERO;
extern int TS_URL_LEN_TELNET;
extern int TS_URL_LEN_WAIS;
extern int TS_URL_LEN_WS;
extern int TS_URL_LEN_WSS;

/* --------------------------------------------------------------------------
   MIME fields */
extern const char *TS_MIME_FIELD_ACCEPT;
extern const char *TS_MIME_FIELD_ACCEPT_CHARSET;
extern const char *TS_MIME_FIELD_ACCEPT_ENCODING;
extern const char *TS_MIME_FIELD_ACCEPT_LANGUAGE;
extern const char *TS_MIME_FIELD_ACCEPT_RANGES;
extern const char *TS_MIME_FIELD_AGE;
extern const char *TS_MIME_FIELD_ALLOW;
extern const char *TS_MIME_FIELD_APPROVED;
extern const char *TS_MIME_FIELD_AUTHORIZATION;
extern const char *TS_MIME_FIELD_BYTES;
extern const char *TS_MIME_FIELD_CACHE_CONTROL;
extern const char *TS_MIME_FIELD_CLIENT_IP;
extern const char *TS_MIME_FIELD_CONNECTION;
extern const char *TS_MIME_FIELD_CONTENT_BASE;
extern const char *TS_MIME_FIELD_CONTENT_ENCODING;
extern const char *TS_MIME_FIELD_CONTENT_LANGUAGE;
extern const char *TS_MIME_FIELD_CONTENT_LENGTH;
extern const char *TS_MIME_FIELD_CONTENT_LOCATION;
extern const char *TS_MIME_FIELD_CONTENT_MD5;
extern const char *TS_MIME_FIELD_CONTENT_RANGE;
extern const char *TS_MIME_FIELD_CONTENT_TYPE;
extern const char *TS_MIME_FIELD_CONTROL;
extern const char *TS_MIME_FIELD_COOKIE;
extern const char *TS_MIME_FIELD_DATE;
extern const char *TS_MIME_FIELD_DISTRIBUTION;
extern const char *TS_MIME_FIELD_ETAG;
extern const char *TS_MIME_FIELD_EXPECT;
extern const char *TS_MIME_FIELD_EXPIRES;
extern const char *TS_MIME_FIELD_FOLLOWUP_TO;
extern const char *TS_MIME_FIELD_FROM;
extern const char *TS_MIME_FIELD_HOST;
extern const char *TS_MIME_FIELD_IF_MATCH;
extern const char *TS_MIME_FIELD_IF_MODIFIED_SINCE;
extern const char *TS_MIME_FIELD_IF_NONE_MATCH;
extern const char *TS_MIME_FIELD_IF_RANGE;
extern const char *TS_MIME_FIELD_IF_UNMODIFIED_SINCE;
extern const char *TS_MIME_FIELD_KEEP_ALIVE;
extern const char *TS_MIME_FIELD_KEYWORDS;
extern const char *TS_MIME_FIELD_LAST_MODIFIED;
extern const char *TS_MIME_FIELD_LINES;
extern const char *TS_MIME_FIELD_LOCATION;
extern const char *TS_MIME_FIELD_MAX_FORWARDS;
extern const char *TS_MIME_FIELD_MESSAGE_ID;
extern const char *TS_MIME_FIELD_NEWSGROUPS;
extern const char *TS_MIME_FIELD_ORGANIZATION;
extern const char *TS_MIME_FIELD_PATH;
extern const char *TS_MIME_FIELD_PRAGMA;
extern const char *TS_MIME_FIELD_PROXY_AUTHENTICATE;
extern const char *TS_MIME_FIELD_PROXY_AUTHORIZATION;
extern const char *TS_MIME_FIELD_PROXY_CONNECTION;
extern const char *TS_MIME_FIELD_PUBLIC;
extern const char *TS_MIME_FIELD_RANGE;
extern const char *TS_MIME_FIELD_REFERENCES;
extern const char *TS_MIME_FIELD_REFERER;
extern const char *TS_MIME_FIELD_REPLY_TO;
extern const char *TS_MIME_FIELD_RETRY_AFTER;
extern const char *TS_MIME_FIELD_SENDER;
extern const char *TS_MIME_FIELD_SERVER;
extern const char *TS_MIME_FIELD_SET_COOKIE;
extern const char *TS_MIME_FIELD_STRICT_TRANSPORT_SECURITY;
extern const char *TS_MIME_FIELD_SUBJECT;
extern const char *TS_MIME_FIELD_SUMMARY;
extern const char *TS_MIME_FIELD_TE;
extern const char *TS_MIME_FIELD_TRANSFER_ENCODING;
extern const char *TS_MIME_FIELD_UPGRADE;
extern const char *TS_MIME_FIELD_USER_AGENT;
extern const char *TS_MIME_FIELD_VARY;
extern const char *TS_MIME_FIELD_VIA;
extern const char *TS_MIME_FIELD_WARNING;
extern const char *TS_MIME_FIELD_WWW_AUTHENTICATE;
extern const char *TS_MIME_FIELD_XREF;
extern const char *TS_MIME_FIELD_X_FORWARDED_FOR;
extern const char *TS_MIME_FIELD_FORWARDED;

/* --------------------------------------------------------------------------
   MIME fields string lengths */
extern int TS_MIME_LEN_ACCEPT;
extern int TS_MIME_LEN_ACCEPT_CHARSET;
extern int TS_MIME_LEN_ACCEPT_ENCODING;
extern int TS_MIME_LEN_ACCEPT_LANGUAGE;
extern int TS_MIME_LEN_ACCEPT_RANGES;
extern int TS_MIME_LEN_AGE;
extern int TS_MIME_LEN_ALLOW;
extern int TS_MIME_LEN_APPROVED;
extern int TS_MIME_LEN_AUTHORIZATION;
extern int TS_MIME_LEN_BYTES;
extern int TS_MIME_LEN_CACHE_CONTROL;
extern int TS_MIME_LEN_CLIENT_IP;
extern int TS_MIME_LEN_CONNECTION;
extern int TS_MIME_LEN_CONTENT_BASE;
extern int TS_MIME_LEN_CONTENT_ENCODING;
extern int TS_MIME_LEN_CONTENT_LANGUAGE;
extern int TS_MIME_LEN_CONTENT_LENGTH;
extern int TS_MIME_LEN_CONTENT_LOCATION;
extern int TS_MIME_LEN_CONTENT_MD5;
extern int TS_MIME_LEN_CONTENT_RANGE;
extern int TS_MIME_LEN_CONTENT_TYPE;
extern int TS_MIME_LEN_CONTROL;
extern int TS_MIME_LEN_COOKIE;
extern int TS_MIME_LEN_DATE;
extern int TS_MIME_LEN_DISTRIBUTION;
extern int TS_MIME_LEN_ETAG;
extern int TS_MIME_LEN_EXPECT;
extern int TS_MIME_LEN_EXPIRES;
extern int TS_MIME_LEN_FOLLOWUP_TO;
extern int TS_MIME_LEN_FROM;
extern int TS_MIME_LEN_HOST;
extern int TS_MIME_LEN_IF_MATCH;
extern int TS_MIME_LEN_IF_MODIFIED_SINCE;
extern int TS_MIME_LEN_IF_NONE_MATCH;
extern int TS_MIME_LEN_IF_RANGE;
extern int TS_MIME_LEN_IF_UNMODIFIED_SINCE;
extern int TS_MIME_LEN_KEEP_ALIVE;
extern int TS_MIME_LEN_KEYWORDS;
extern int TS_MIME_LEN_LAST_MODIFIED;
extern int TS_MIME_LEN_LINES;
extern int TS_MIME_LEN_LOCATION;
extern int TS_MIME_LEN_MAX_FORWARDS;
extern int TS_MIME_LEN_MESSAGE_ID;
extern int TS_MIME_LEN_NEWSGROUPS;
extern int TS_MIME_LEN_ORGANIZATION;
extern int TS_MIME_LEN_PATH;
extern int TS_MIME_LEN_PRAGMA;
extern int TS_MIME_LEN_PROXY_AUTHENTICATE;
extern int TS_MIME_LEN_PROXY_AUTHORIZATION;
extern int TS_MIME_LEN_PROXY_CONNECTION;
extern int TS_MIME_LEN_PUBLIC;
extern int TS_MIME_LEN_RANGE;
extern int TS_MIME_LEN_REFERENCES;
extern int TS_MIME_LEN_REFERER;
extern int TS_MIME_LEN_REPLY_TO;
extern int TS_MIME_LEN_RETRY_AFTER;
extern int TS_MIME_LEN_SENDER;
extern int TS_MIME_LEN_SERVER;
extern int TS_MIME_LEN_SET_COOKIE;
extern int TS_MIME_LEN_STRICT_TRANSPORT_SECURITY;
extern int TS_MIME_LEN_SUBJECT;
extern int TS_MIME_LEN_SUMMARY;
extern int TS_MIME_LEN_TE;
extern int TS_MIME_LEN_TRANSFER_ENCODING;
extern int TS_MIME_LEN_UPGRADE;
extern int TS_MIME_LEN_USER_AGENT;
extern int TS_MIME_LEN_VARY;
extern int TS_MIME_LEN_VIA;
extern int TS_MIME_LEN_WARNING;
extern int TS_MIME_LEN_WWW_AUTHENTICATE;
extern int TS_MIME_LEN_XREF;
extern int TS_MIME_LEN_X_FORWARDED_FOR;
extern int TS_MIME_LEN_FORWARDED;

/* --------------------------------------------------------------------------
   HTTP values */
extern const char *TS_HTTP_VALUE_BYTES;
extern const char *TS_HTTP_VALUE_CHUNKED;
extern const char *TS_HTTP_VALUE_CLOSE;
extern const char *TS_HTTP_VALUE_COMPRESS;
extern const char *TS_HTTP_VALUE_DEFLATE;
extern const char *TS_HTTP_VALUE_GZIP;
extern const char *TS_HTTP_VALUE_BROTLI;
extern const char *TS_HTTP_VALUE_ZSTD;
extern const char *TS_HTTP_VALUE_IDENTITY;
extern const char *TS_HTTP_VALUE_KEEP_ALIVE;
extern const char *TS_HTTP_VALUE_MAX_AGE;
extern const char *TS_HTTP_VALUE_MAX_STALE;
extern const char *TS_HTTP_VALUE_MIN_FRESH;
extern const char *TS_HTTP_VALUE_MUST_REVALIDATE;
extern const char *TS_HTTP_VALUE_NONE;
extern const char *TS_HTTP_VALUE_NO_CACHE;
extern const char *TS_HTTP_VALUE_NO_STORE;
extern const char *TS_HTTP_VALUE_NO_TRANSFORM;
extern const char *TS_HTTP_VALUE_ONLY_IF_CACHED;
extern const char *TS_HTTP_VALUE_PRIVATE;
extern const char *TS_HTTP_VALUE_PROXY_REVALIDATE;
extern const char *TS_HTTP_VALUE_PUBLIC;

/* --------------------------------------------------------------------------
   HTTP values string lengths */
extern int TS_HTTP_LEN_BYTES;
extern int TS_HTTP_LEN_CHUNKED;
extern int TS_HTTP_LEN_CLOSE;
extern int TS_HTTP_LEN_COMPRESS;
extern int TS_HTTP_LEN_DEFLATE;
extern int TS_HTTP_LEN_GZIP;
extern int TS_HTTP_LEN_BROTLI;
extern int TS_HTTP_LEN_ZSTD;
extern int TS_HTTP_LEN_IDENTITY;
extern int TS_HTTP_LEN_KEEP_ALIVE;
extern int TS_HTTP_LEN_MAX_AGE;
extern int TS_HTTP_LEN_MAX_STALE;
extern int TS_HTTP_LEN_MIN_FRESH;
extern int TS_HTTP_LEN_MUST_REVALIDATE;
extern int TS_HTTP_LEN_NONE;
extern int TS_HTTP_LEN_NO_CACHE;
extern int TS_HTTP_LEN_NO_STORE;
extern int TS_HTTP_LEN_NO_TRANSFORM;
extern int TS_HTTP_LEN_ONLY_IF_CACHED;
extern int TS_HTTP_LEN_PRIVATE;
extern int TS_HTTP_LEN_PROXY_REVALIDATE;
extern int TS_HTTP_LEN_PUBLIC;

/* --------------------------------------------------------------------------
   HTTP methods */
extern const char *TS_HTTP_METHOD_CONNECT;
extern const char *TS_HTTP_METHOD_DELETE;
extern const char *TS_HTTP_METHOD_GET;
extern const char *TS_HTTP_METHOD_HEAD;
extern const char *TS_HTTP_METHOD_OPTIONS;
extern const char *TS_HTTP_METHOD_POST;
extern const char *TS_HTTP_METHOD_PURGE;
extern const char *TS_HTTP_METHOD_PUT;
extern const char *TS_HTTP_METHOD_TRACE;
extern const char *TS_HTTP_METHOD_PUSH;

/* --------------------------------------------------------------------------
   HTTP methods string lengths */
extern int TS_HTTP_LEN_CONNECT;
extern int TS_HTTP_LEN_DELETE;
extern int TS_HTTP_LEN_GET;
extern int TS_HTTP_LEN_HEAD;
extern int TS_HTTP_LEN_OPTIONS;
extern int TS_HTTP_LEN_POST;
extern int TS_HTTP_LEN_PURGE;
extern int TS_HTTP_LEN_PUT;
extern int TS_HTTP_LEN_TRACE;
extern int TS_HTTP_LEN_PUSH;

/* --------------------------------------------------------------------------
   TLS Next Protocol well-known protocol names. */

extern const char *const TS_ALPN_PROTOCOL_HTTP_0_9;
extern const char *const TS_ALPN_PROTOCOL_HTTP_1_0;
extern const char *const TS_ALPN_PROTOCOL_HTTP_1_1;
extern const char *const TS_ALPN_PROTOCOL_HTTP_2_0;
extern const char *const TS_ALPN_PROTOCOL_HTTP_3;
extern const char *const TS_ALPN_PROTOCOL_HTTP_3_D29;
extern const char *const TS_ALPN_PROTOCOL_HTTP_QUIC;
extern const char *const TS_ALPN_PROTOCOL_HTTP_QUIC_D29;

extern int TS_ALPN_PROTOCOL_INDEX_HTTP_0_9;
extern int TS_ALPN_PROTOCOL_INDEX_HTTP_1_0;
extern int TS_ALPN_PROTOCOL_INDEX_HTTP_1_1;
extern int TS_ALPN_PROTOCOL_INDEX_HTTP_2_0;
extern int TS_ALPN_PROTOCOL_INDEX_HTTP_3;
extern int TS_ALPN_PROTOCOL_INDEX_HTTP_QUIC;

extern const char *const TS_ALPN_PROTOCOL_GROUP_HTTP;
extern const char *const TS_ALPN_PROTOCOL_GROUP_HTTP2;

extern const char *const TS_PROTO_TAG_HTTP_1_0;
extern const char *const TS_PROTO_TAG_HTTP_1_1;
extern const char *const TS_PROTO_TAG_HTTP_2_0;
extern const char *const TS_PROTO_TAG_HTTP_3;
extern const char *const TS_PROTO_TAG_HTTP_QUIC;
extern const char *const TS_PROTO_TAG_TLS_1_3;
extern const char *const TS_PROTO_TAG_TLS_1_2;
extern const char *const TS_PROTO_TAG_TLS_1_1;
extern const char *const TS_PROTO_TAG_TLS_1_0;
extern const char *const TS_PROTO_TAG_TCP;
extern const char *const TS_PROTO_TAG_UDP;
extern const char *const TS_PROTO_TAG_IPV4;
extern const char *const TS_PROTO_TAG_IPV6;

/* --------------------------------------------------------------------------
   MLoc Constants */
/**
    Use TS_NULL_MLOC as the parent in calls that require a parent
    when an TSMLoc does not have a parent TSMLoc. For example if
    the TSMLoc is obtained by a call to TSHttpTxnClientReqGet(),

 */
TSMLoc const TS_NULL_MLOC = nullptr;

/* --------------------------------------------------------------------------
   HostStatus types */

enum TSHostStatus {
  TS_HOST_STATUS_INIT,
  TS_HOST_STATUS_DOWN,
  TS_HOST_STATUS_UP,
};

/* MUST match proxy/HostStatus.h Reason.
 * If a value is added here, it MUST be added there with the same value.
 */
enum TSHostStatusReason {
  TS_HOST_STATUS_ACTIVE      = 0x1,
  TS_HOST_STATUS_LOCAL       = 0x2,
  TS_HOST_STATUS_MANUAL      = 0x4,
  TS_HOST_STATUS_SELF_DETECT = 0x8,
  TS_HOST_STATUS_ALL         = 0xf,
};

/* --------------------------------------------------------------------------
   Interface for the UUID APIs. https://www.ietf.org/rfc/rfc4122.txt. */
enum TSUuidVersion {
  TS_UUID_UNDEFINED = 0,
  TS_UUID_V1        = 1,
  TS_UUID_V2,
  TS_UUID_V3,
  TS_UUID_V4, /* At this point, this is the only implemented version (or variant) */
  TS_UUID_V5,
};

const int TS_UUID_STRING_LEN   = 36;
const int TS_CRUUID_STRING_LEN = TS_UUID_STRING_LEN + 19 + 1; /* UUID-len + len(uint64_t) + '-' */
using TSUuid                   = struct tsapi_uuid *;

/* Various HTTP "control" modes */
enum TSHttpCntlType {
  TS_HTTP_CNTL_LOGGING_MODE,
  TS_HTTP_CNTL_INTERCEPT_RETRY_MODE,
  TS_HTTP_CNTL_RESPONSE_CACHEABLE,
  TS_HTTP_CNTL_REQUEST_CACHEABLE,
  TS_HTTP_CNTL_SERVER_NO_STORE,
  TS_HTTP_CNTL_TXN_DEBUG,
  TS_HTTP_CNTL_SKIP_REMAPPING,
};

// JSONRPC 2.0 related interface.
using TSRPCProviderHandle = struct tsapi_rpcproviderhandle *;
using TSYaml              = struct tsapi_yaml *;

///
/// @brief JSON-RPC Handler options
///
/// This class holds information about how a handler will be managed and delivered when called. The JSON-RPC manager would use
/// this object to perform certain validation.
///
struct TSRPCHandlerOptions {
  struct Auth {
    int restricted; ///< Tells the RPC Manager if the call can be delivered or not based on the config rules.
  } auth{1};
};

/// Configuration field info related to a parsed YAML node.
///
/// This contains information about the parsed record field. This will be passed back to the @a TSYAMLRecNodeHandler
/// when you call @a TSRecYAMLConfigParse. This class holds the record name as well as the YAML node in case the caller
/// wants to use this information to manipulate the record.
struct TSYAMLRecCfgFieldData {
  const char *field_name;  ///< YAML field name. null terminated
  const char *record_name; ///< record name. null terminated
  TSYaml      value_node;  ///< YAML::Node pointer.
};

typedef enum {
  TS_TXN_TYPE_UNKNOWN,
  TS_TXN_TYPE_HTTP,
  TS_TXN_TYPE_EXPLICIT_TUNNEL,
  TS_TXN_TYPE_TR_PASS_TUNNEL,
} TSTxnType;

/// Exposed for custom parent selection behavior.
///
/// This can used in association with TS_EVENT_HTTP_OS_DNS.
/// Plugins may set this to indicate how to retry.
/// If handled false:
///   then no plugin set it and Core will proceed to do its own thing.
/// If handled true:
///   core will not do any parent processing, markdown, or anything else,
///   but will use the values in this for whether to use the existing
///   response or make another request
struct TSResponseAction {
  char const *hostname;     ///< host for next request (must be null terminated?)
  size_t      hostname_len; ///< host len for next request (not including null)
  in_port_t   port;         ///< port for next request
  bool        fail;
  bool        is_retry;
  bool        nextHopExists;
  bool        responseIsRetryable;
  bool        goDirect;
  bool        parentIsProxy;
  bool        no_cache;
};

/* --------------------------------------------------------------------------
   Init */

/**
    This function must be defined by all plugins. Traffic Server
    calls this initialization routine when it loads the plugin (at
    startup), and sets argc and argv appropriately based on the values
    in plugin.config.  (Functions linked dynamically, and called using
    dlsym() must be undecorated / extern "C".)

    @param argc the number of initial values specified in plugin.config,
      plus one. If only the name of your plugin shared object is
      specified in plugin.config, argc=1.
    @param argv the vector of arguments. The length of argv is argc.
      argv[0] is the name of the plugin shared library. Subsequent
      values of argv are initialization values specified in
      plugin.config.

 */
extern "C" void TSPluginInit(int argc, const char *argv[]);

namespace ts
{
static const int NO_FD = -1; ///< No or invalid file descriptor.
}

#ifndef ATS_BUILD

#endif