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#ifndef HEADER_CURL_CONNCACHE_H
#define HEADER_CURL_CONNCACHE_H
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2015 - 2021, Daniel Stenberg, <daniel@haxx.se>, et al.
* Copyright (C) 2012 - 2014, Linus Nielsen Feltzing, <linus@haxx.se>
*
* This software is licensed as described in the file COPYING, which
* you should have received as part of this distribution. The terms
* are also available at https://curl.se/docs/copyright.html.
*
* You may opt to use, copy, modify, merge, publish, distribute and/or sell
* copies of the Software, and permit persons to whom the Software is
* furnished to do so, under the terms of the COPYING file.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
***************************************************************************/
/*
* All accesses to struct fields and changing of data in the connection cache
* and connectbundles must be done with the conncache LOCKED. The cache might
* be shared.
*/
#include "timeval.h"
struct connectdata;
struct conncache {
struct Curl_hash hash;
size_t num_conn;
long next_connection_id;
struct curltime last_cleanup;
/* handle used for closing cached connections */
struct Curl_easy *closure_handle;
};
#define BUNDLE_NO_MULTIUSE -1
#define BUNDLE_UNKNOWN 0 /* initial value */
#define BUNDLE_MULTIPLEX 2
#ifdef CURLDEBUG
/* the debug versions of these macros make extra certain that the lock is
never doubly locked or unlocked */
#define CONNCACHE_LOCK(x) \
do { \
if((x)->share) { \
Curl_share_lock((x), CURL_LOCK_DATA_CONNECT, \
CURL_LOCK_ACCESS_SINGLE); \
DEBUGASSERT(!(x)->state.conncache_lock); \
(x)->state.conncache_lock = TRUE; \
} \
} while(0)
#define CONNCACHE_UNLOCK(x) \
do { \
if((x)->share) { \
DEBUGASSERT((x)->state.conncache_lock); \
(x)->state.conncache_lock = FALSE; \
Curl_share_unlock((x), CURL_LOCK_DATA_CONNECT); \
} \
} while(0)
#else
#define CONNCACHE_LOCK(x) if((x)->share) \
Curl_share_lock((x), CURL_LOCK_DATA_CONNECT, CURL_LOCK_ACCESS_SINGLE)
#define CONNCACHE_UNLOCK(x) if((x)->share) \
Curl_share_unlock((x), CURL_LOCK_DATA_CONNECT)
#endif
struct connectbundle {
int multiuse; /* supports multi-use */
size_t num_connections; /* Number of connections in the bundle */
struct Curl_llist conn_list; /* The connectdata members of the bundle */
};
/* returns 1 on error, 0 is fine */
int Curl_conncache_init(struct conncache *, int size);
void Curl_conncache_destroy(struct conncache *connc);
/* return the correct bundle, to a host or a proxy */
struct connectbundle *Curl_conncache_find_bundle(struct Curl_easy *data,
struct connectdata *conn,
struct conncache *connc,
const char **hostp);
/* returns number of connections currently held in the connection cache */
size_t Curl_conncache_size(struct Curl_easy *data);
bool Curl_conncache_return_conn(struct Curl_easy *data,
struct connectdata *conn);
CURLcode Curl_conncache_add_conn(struct Curl_easy *data) WARN_UNUSED_RESULT;
void Curl_conncache_remove_conn(struct Curl_easy *data,
struct connectdata *conn,
bool lock);
bool Curl_conncache_foreach(struct Curl_easy *data,
struct conncache *connc,
void *param,
int (*func)(struct Curl_easy *data,
struct connectdata *conn,
void *param));
struct connectdata *
Curl_conncache_find_first_connection(struct conncache *connc);
struct connectdata *
Curl_conncache_extract_bundle(struct Curl_easy *data,
struct connectbundle *bundle);
struct connectdata *
Curl_conncache_extract_oldest(struct Curl_easy *data);
void Curl_conncache_close_all_connections(struct conncache *connc);
void Curl_conncache_print(struct conncache *connc);
#endif /* HEADER_CURL_CONNCACHE_H */
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