| 1 | #ifndef HEADER_CURL_CONNCACHE_H
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| 2 | #define HEADER_CURL_CONNCACHE_H
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| 3 | /***************************************************************************
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| 4 | * _ _ ____ _
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| 5 | * Project ___| | | | _ \| |
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| 6 | * / __| | | | |_) | |
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| 7 | * | (__| |_| | _ <| |___
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| 8 | * \___|\___/|_| \_\_____|
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| 9 | *
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| 10 | * Copyright (C) 2015 - 2022, Daniel Stenberg, <[email protected]>, et al.
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| 11 | * Copyright (C) 2012 - 2014, Linus Nielsen Feltzing, <[email protected]>
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| 12 | *
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| 13 | * This software is licensed as described in the file COPYING, which
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| 14 | * you should have received as part of this distribution. The terms
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| 15 | * are also available at https://curl.se/docs/copyright.html.
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| 16 | *
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| 17 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 18 | * copies of the Software, and permit persons to whom the Software is
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| 19 | * furnished to do so, under the terms of the COPYING file.
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| 20 | *
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| 21 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 22 | * KIND, either express or implied.
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| 23 | *
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| 24 | * SPDX-License-Identifier: curl
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| 25 | *
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| 26 | ***************************************************************************/
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| 27 |
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| 28 | /*
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| 29 | * All accesses to struct fields and changing of data in the connection cache
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| 30 | * and connectbundles must be done with the conncache LOCKED. The cache might
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| 31 | * be shared.
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| 32 | */
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| 33 |
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| 34 | #include <curl/curl.h>
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| 35 | #include "timeval.h"
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| 36 |
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| 37 | struct connectdata;
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| 38 |
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| 39 | struct conncache {
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| 40 | struct Curl_hash hash;
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| 41 | size_t num_conn;
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| 42 | long next_connection_id;
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| 43 | struct curltime last_cleanup;
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| 44 | /* handle used for closing cached connections */
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| 45 | struct Curl_easy *closure_handle;
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| 46 | };
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| 47 |
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| 48 | #define BUNDLE_NO_MULTIUSE -1
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| 49 | #define BUNDLE_UNKNOWN 0 /* initial value */
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| 50 | #define BUNDLE_MULTIPLEX 2
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| 51 |
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| 52 | #ifdef CURLDEBUG
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| 53 | /* the debug versions of these macros make extra certain that the lock is
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| 54 | never doubly locked or unlocked */
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| 55 | #define CONNCACHE_LOCK(x) \
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| 56 | do { \
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| 57 | if((x)->share) { \
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| 58 | Curl_share_lock((x), CURL_LOCK_DATA_CONNECT, \
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| 59 | CURL_LOCK_ACCESS_SINGLE); \
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| 60 | DEBUGASSERT(!(x)->state.conncache_lock); \
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| 61 | (x)->state.conncache_lock = TRUE; \
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| 62 | } \
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| 63 | } while(0)
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| 64 |
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| 65 | #define CONNCACHE_UNLOCK(x) \
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| 66 | do { \
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| 67 | if((x)->share) { \
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| 68 | DEBUGASSERT((x)->state.conncache_lock); \
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| 69 | (x)->state.conncache_lock = FALSE; \
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| 70 | Curl_share_unlock((x), CURL_LOCK_DATA_CONNECT); \
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| 71 | } \
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| 72 | } while(0)
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| 73 | #else
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| 74 | #define CONNCACHE_LOCK(x) if((x)->share) \
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| 75 | Curl_share_lock((x), CURL_LOCK_DATA_CONNECT, CURL_LOCK_ACCESS_SINGLE)
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| 76 | #define CONNCACHE_UNLOCK(x) if((x)->share) \
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| 77 | Curl_share_unlock((x), CURL_LOCK_DATA_CONNECT)
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| 78 | #endif
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| 79 |
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| 80 | struct connectbundle {
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| 81 | int multiuse; /* supports multi-use */
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| 82 | size_t num_connections; /* Number of connections in the bundle */
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| 83 | struct Curl_llist conn_list; /* The connectdata members of the bundle */
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| 84 | };
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| 85 |
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| 86 | /* returns 1 on error, 0 is fine */
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| 87 | int Curl_conncache_init(struct conncache *, int size);
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| 88 | void Curl_conncache_destroy(struct conncache *connc);
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| 89 |
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| 90 | /* return the correct bundle, to a host or a proxy */
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| 91 | struct connectbundle *Curl_conncache_find_bundle(struct Curl_easy *data,
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| 92 | struct connectdata *conn,
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| 93 | struct conncache *connc);
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| 94 | /* returns number of connections currently held in the connection cache */
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| 95 | size_t Curl_conncache_size(struct Curl_easy *data);
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| 96 |
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| 97 | bool Curl_conncache_return_conn(struct Curl_easy *data,
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| 98 | struct connectdata *conn);
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| 99 | CURLcode Curl_conncache_add_conn(struct Curl_easy *data) WARN_UNUSED_RESULT;
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| 100 | void Curl_conncache_remove_conn(struct Curl_easy *data,
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| 101 | struct connectdata *conn,
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| 102 | bool lock);
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| 103 | bool Curl_conncache_foreach(struct Curl_easy *data,
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| 104 | struct conncache *connc,
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| 105 | void *param,
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| 106 | int (*func)(struct Curl_easy *data,
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| 107 | struct connectdata *conn,
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| 108 | void *param));
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| 109 |
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| 110 | struct connectdata *
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| 111 | Curl_conncache_find_first_connection(struct conncache *connc);
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| 112 |
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| 113 | struct connectdata *
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| 114 | Curl_conncache_extract_bundle(struct Curl_easy *data,
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| 115 | struct connectbundle *bundle);
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| 116 | struct connectdata *
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| 117 | Curl_conncache_extract_oldest(struct Curl_easy *data);
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| 118 | void Curl_conncache_close_all_connections(struct conncache *connc);
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| 119 | void Curl_conncache_print(struct conncache *connc);
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| 120 |
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| 121 | #endif /* HEADER_CURL_CONNCACHE_H */
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