aboutsummaryrefslogtreecommitdiff
path: root/lib/conncache.c
blob: dc5b58cbef817d40b1412130bdd3ebf2afe089dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
/***************************************************************************
 *                                  _   _ ____  _
 *  Project                     ___| | | |  _ \| |
 *                             / __| | | | |_) | |
 *                            | (__| |_| |  _ <| |___
 *                             \___|\___/|_| \_\_____|
 *
 * Copyright (C) 2012, 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 http://curl.haxx.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.
 *
 ***************************************************************************/

#include "setup.h"

#include <curl/curl.h>

#include "urldata.h"
#include "url.h"
#include "progress.h"
#include "multiif.h"
#include "sendf.h"
#include "rawstr.h"
#include "bundles.h"
#include "conncache.h"

#include "curl_memory.h"
/* The last #include file should be: */
#include "memdebug.h"

#define CONNECTION_HASH_SIZE 97

static void free_bundle_hash_entry(void *freethis)
{
  struct connectbundle *b = (struct connectbundle *) freethis;

  Curl_bundle_destroy(b);
}

struct conncache *Curl_conncache_init(conncachetype type)
{
  struct conncache *connc;

  connc = calloc(1, sizeof(struct conncache));
  if(!connc)
    return NULL;

  connc->hash = Curl_hash_alloc(CONNECTION_HASH_SIZE, Curl_hash_str,
                                Curl_str_key_compare, free_bundle_hash_entry);

  if(!connc->hash) {
    free(connc);
    return NULL;
  }

  connc->type = type;
  connc->num_connections = 0;

  return connc;
}

void Curl_conncache_destroy(struct conncache *connc)
{
  Curl_hash_destroy(connc->hash);
  free(connc);
}

struct connectbundle *Curl_conncache_find_bundle(struct conncache *connc,
                                                 char *hostname)
{
  struct connectbundle *bundle = NULL;

  if(connc)
    bundle = Curl_hash_pick(connc->hash, hostname, strlen(hostname)+1);

  return bundle;
}

static bool conncache_add_bundle(struct conncache *connc,
                                 char *hostname,
                                 struct connectbundle *bundle)
{
  void *p;

  p = Curl_hash_add(connc->hash, hostname, strlen(hostname)+1, bundle);

  return p?TRUE:FALSE;
}

static void conncache_remove_bundle(struct conncache *connc,
                                    struct connectbundle *bundle)
{
  struct curl_hash_iterator iter;
  struct curl_hash_element *he;

  if(!connc)
    return;

  Curl_hash_start_iterate(connc->hash, &iter);

  he = Curl_hash_next_element(&iter);
  while(he) {
    if(he->ptr == bundle) {
      /* The bundle is destroyed by the hash destructor function,
         free_bundle_hash_entry() */
      Curl_hash_delete(connc->hash, he->key, he->key_len);
      return;
    }

    he = Curl_hash_next_element(&iter);
  }
}

CURLcode Curl_conncache_add_conn(struct conncache *connc,
                                 struct connectdata *conn)
{
  CURLcode result;
  struct connectbundle *bundle;
  struct SessionHandle *data = conn->data;

  bundle = Curl_conncache_find_bundle(data->state.conn_cache,
                                      conn->host.name);
  if(!bundle) {
    result = Curl_bundle_create(data, &bundle);
    if(result != CURLE_OK)
      return result;

    if(!conncache_add_bundle(data->state.conn_cache,
                             conn->host.name, bundle))
      return CURLE_OUT_OF_MEMORY;
  }

  result = Curl_bundle_add_conn(bundle, conn);
  if(result != CURLE_OK)
    return result;

  connc->num_connections++;

  return CURLE_OK;
}

void Curl_conncache_remove_conn(struct conncache *connc,
                                struct connectdata *conn)
{
  struct connectbundle *bundle = conn->bundle;

  /* The bundle pointer can be NULL, since this function can be called
     due to a failed connection attempt, before being added to a bundle */
  if(bundle) {
    Curl_bundle_remove_conn(bundle, conn);
    if(bundle->num_connections == 0) {
      conncache_remove_bundle(connc, bundle);
    }
    connc->num_connections--;

    DEBUGF(infof(conn->data, "The cache now contains %d members\n",
                 connc->num_connections));
  }
}

/* This function iterates the entire connection cache and calls the
   function func() with the connection pointer as the first argument
   and the supplied 'param' argument as the other */
void Curl_conncache_foreach(struct conncache *connc,
                            void *param,
                            void (*func)(void *conn, void *param))
{
  struct curl_hash_iterator iter;
  struct curl_llist_element *curr;
  struct curl_hash_element *he;

  if(!connc)
    return;

  Curl_hash_start_iterate(connc->hash, &iter);

  he = Curl_hash_next_element(&iter);
  while(he) {
    struct connectbundle *bundle;
    struct connectdata *conn;

    bundle = he->ptr;

    curr = bundle->conn_list->head;
    while(curr) {
      /* Yes, we need to update curr before calling func(), because func()
         might decide to remove the connection */
      conn = curr->ptr;
      curr = curr->next;

      func(conn, param);
    }

    he = Curl_hash_next_element(&iter);
  }
}

/* Return the first connection found in the cache. Used when closing all
   connections */
struct connectdata *
Curl_conncache_find_first_connection(struct conncache *connc)
{
  struct curl_hash_iterator iter;
  struct curl_llist_element *curr;
  struct curl_hash_element *he;
  struct connectbundle *bundle;

  Curl_hash_start_iterate(connc->hash, &iter);

  he = Curl_hash_next_element(&iter);
  while(he) {
    bundle = he->ptr;

    curr = bundle->conn_list->head;
    if(curr) {
      return curr->ptr;
    }

    he = Curl_hash_next_element(&iter);
  }

  return NULL;
}


#if 0
/* Useful for debugging the connection cache */
void Curl_conncache_print(struct conncache *connc)
{
  struct curl_hash_iterator iter;
  struct curl_llist_element *curr;
  struct curl_hash_element *he;

  if(!connc)
    return;

  fprintf(stderr, "=Bundle cache=\n");

  Curl_hash_start_iterate(connc->hash, &iter);

  he = Curl_hash_next_element(&iter);
  while(he) {
    struct connectbundle *bundle;
    struct connectdata *conn;

    bundle = he->ptr;

    fprintf(stderr, "%s -", he->key);
    curr = bundle->conn_list->head;
    while(curr) {
      conn = curr->ptr;

      fprintf(stderr, " [%p %d]", (void *)conn, conn->inuse);
      curr = curr->next;
    }
    fprintf(stderr, "\n");

    he = Curl_hash_next_element(&iter);
  }
}
#endif