/*
 * Copyright (c) 2017-2022 Cisco and/or its affiliates.
 * 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.
 */
#ifndef __included_http_static_h__
#define __included_http_static_h__

#include <vnet/session/application_interface.h>
#include <vnet/session/session.h>
#include <http/http.h>

#include <vppinfra/hash.h>
#include <vppinfra/error.h>
#include <vppinfra/bihash_vec8_8.h>

/** @file http_static.h
 * Static http server definitions
 */

/** \brief Application session
 */
typedef struct
{
  CLIB_CACHE_LINE_ALIGN_MARK (cacheline0);
  u32 session_index;
  /** rx thread index */
  u32 thread_index;
  /** vpp session index, handle */
  u32 vpp_session_index;
  session_handle_t vpp_session_handle;
  /** Fully-resolved file path */
  u8 *path;
  /** File data, a vector */
  u8 *data;
  /** Current data send offset */
  u32 data_offset;
  /** Need to free data in detach_cache_entry */
  int free_data;
  /** File cache pool index */
  u32 cache_pool_index;
} hss_session_t;

/** \brief In-memory file data cache entry
 */
typedef struct
{
  /** Name of the file */
  u8 *filename;
  /** Contents of the file, as a u8 * vector */
  u8 *data;
  /** Last time the cache entry was used */
  f64 last_used;
  /** Cache LRU links */
  u32 next_index;
  u32 prev_index;
  /** Reference count, so we don't recycle while referenced */
  int inuse;
} hss_cache_entry_t;

typedef int (*hss_url_handler_t) (http_req_method_t, u8 *, hss_session_t *);

/** \brief Main data structure
 */
typedef struct
{
  /** Per thread vector of session pools */
  hss_session_t **sessions;
  /** Session pool reader writer lock */
  clib_spinlock_t cache_lock;

  /** Unified file data cache pool */
  hss_cache_entry_t *cache_pool;
  /** Hash table which maps file name to file data */
    BVT (clib_bihash) name_to_data;

  /** Hash tables for built-in GET and POST handlers */
  uword *get_url_handlers;
  uword *post_url_handlers;

  /** Current cache size */
  u64 cache_size;
  /** Max cache size in bytes */
  u64 cache_limit;
  /** Number of cache evictions */
  u64 cache_evictions;

  /** Cache LRU listheads */
  u32 first_index;
  u32 last_index;

  /** root path to be served */
  u8 *www_root;

  /** Application index */
  u32 app_index;

  /** Cert and key pair for tls */
  u32 ckpair_index;

  /* API message ID base */
  u16 msg_id_base;

  vlib_main_t *vlib_main;

  /*
   * Config
   */

  /** Enable debug messages */
  int debug_level;
  /** Number of preallocated fifos, usually 0 */
  u32 prealloc_fifos;
  /** Private segment size, usually 0 */
  u64 private_segment_size;
  /** Size of the allocated rx, tx fifos, roughly 8K or so */
  u32 fifo_size;
  /** The bind URI, defaults to tcp://0.0.0.0/80 */
  u8 *uri;
  /** Threshold for switching to ptr data in http msgs */
  u32 use_ptr_thresh;
  /** Enable the use of builtinurls */
  u8 enable_url_handlers;
} hss_main_t;

extern hss_main_t hss_main;

int hss_create (vlib_main_t *vm);

/**
 * Register a GET or POST URL handler
 */
void hss_register_url_handler (hss_url_handler_t fp, const char *url,
			       http_req_method_t type);
void hss_builtinurl_json_handlers_init (void);

#endif /* __included_http_static_h__ */

/*
 * fd.io coding-style-patch-verification: ON
 *
 * Local Variables:
 * eval: (c-set-style "gnu")
 * End:
 */