Permalink
Fetching contributors…
Cannot retrieve contributors at this time
361 lines (292 sloc) 9.36 KB
/***************************************************************************
* _ _ ____ _
* Project ___| | | | _ \| |
* / __| | | | |_) | |
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012 - 2016, Linus Nielsen Feltzing, <linus@haxx.se>
* Copyright (C) 2012 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al.
*
* 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.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 "curl_setup.h"
#include <curl/curl.h>
#include "urldata.h"
#include "url.h"
#include "progress.h"
#include "multiif.h"
#include "sendf.h"
#include "conncache.h"
/* The last 3 #include files should be in this order */
#include "curl_printf.h"
#include "curl_memory.h"
#include "memdebug.h"
static void conn_llist_dtor(void *user, void *element)
{
struct connectdata *data = element;
(void)user;
data->bundle = NULL;
}
static CURLcode bundle_create(struct Curl_easy *data,
struct connectbundle **cb_ptr)
{
(void)data;
DEBUGASSERT(*cb_ptr == NULL);
*cb_ptr = malloc(sizeof(struct connectbundle));
if(!*cb_ptr)
return CURLE_OUT_OF_MEMORY;
(*cb_ptr)->num_connections = 0;
(*cb_ptr)->multiuse = BUNDLE_UNKNOWN;
Curl_llist_init(&(*cb_ptr)->conn_list, (curl_llist_dtor) conn_llist_dtor);
return CURLE_OK;
}
static void bundle_destroy(struct connectbundle *cb_ptr)
{
if(!cb_ptr)
return;
Curl_llist_destroy(&cb_ptr->conn_list, NULL);
free(cb_ptr);
}
/* Add a connection to a bundle */
static CURLcode bundle_add_conn(struct connectbundle *cb_ptr,
struct connectdata *conn)
{
Curl_llist_insert_next(&cb_ptr->conn_list, cb_ptr->conn_list.tail, conn,
&conn->bundle_node);
conn->bundle = cb_ptr;
cb_ptr->num_connections++;
return CURLE_OK;
}
/* Remove a connection from a bundle */
static int bundle_remove_conn(struct connectbundle *cb_ptr,
struct connectdata *conn)
{
struct curl_llist_element *curr;
curr = cb_ptr->conn_list.head;
while(curr) {
if(curr->ptr == conn) {
Curl_llist_remove(&cb_ptr->conn_list, curr, NULL);
cb_ptr->num_connections--;
conn->bundle = NULL;
return 1; /* we removed a handle */
}
curr = curr->next;
}
return 0;
}
static void free_bundle_hash_entry(void *freethis)
{
struct connectbundle *b = (struct connectbundle *) freethis;
bundle_destroy(b);
}
int Curl_conncache_init(struct conncache *connc, int size)
{
return Curl_hash_init(&connc->hash, size, Curl_hash_str,
Curl_str_key_compare, free_bundle_hash_entry);
}
void Curl_conncache_destroy(struct conncache *connc)
{
if(connc)
Curl_hash_destroy(&connc->hash);
}
/* creates a key to find a bundle for this connection */
static void hashkey(struct connectdata *conn, char *buf,
size_t len) /* something like 128 is fine */
{
const char *hostname;
if(conn->bits.socksproxy)
hostname = conn->socks_proxy.host.name;
else if(conn->bits.httpproxy)
hostname = conn->http_proxy.host.name;
else if(conn->bits.conn_to_host)
hostname = conn->conn_to_host.name;
else
hostname = conn->host.name;
DEBUGASSERT(len > 32);
/* put the number first so that the hostname gets cut off if too long */
snprintf(buf, len, "%ld%s", conn->port, hostname);
}
/* Look up the bundle with all the connections to the same host this
connectdata struct is setup to use. */
struct connectbundle *Curl_conncache_find_bundle(struct connectdata *conn,
struct conncache *connc)
{
struct connectbundle *bundle = NULL;
if(connc) {
char key[128];
hashkey(conn, key, sizeof(key));
bundle = Curl_hash_pick(&connc->hash, key, strlen(key));
}
return bundle;
}
static bool conncache_add_bundle(struct conncache *connc,
char *key,
struct connectbundle *bundle)
{
void *p = Curl_hash_add(&connc->hash, key, strlen(key), 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 connectbundle *new_bundle = NULL;
struct Curl_easy *data = conn->data;
bundle = Curl_conncache_find_bundle(conn, data->state.conn_cache);
if(!bundle) {
int rc;
char key[128];
result = bundle_create(data, &new_bundle);
if(result)
return result;
hashkey(conn, key, sizeof(key));
rc = conncache_add_bundle(data->state.conn_cache, key, new_bundle);
if(!rc) {
bundle_destroy(new_bundle);
return CURLE_OUT_OF_MEMORY;
}
bundle = new_bundle;
}
result = bundle_add_conn(bundle, conn);
if(result) {
if(new_bundle)
conncache_remove_bundle(data->state.conn_cache, new_bundle);
return result;
}
conn->connection_id = connc->next_connection_id++;
connc->num_connections++;
DEBUGF(infof(conn->data, "Added connection %ld. "
"The cache now contains %" CURL_FORMAT_CURL_OFF_TU " members\n",
conn->connection_id, (curl_off_t) 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) {
bundle_remove_conn(bundle, conn);
if(bundle->num_connections == 0) {
conncache_remove_bundle(connc, bundle);
}
if(connc) {
connc->num_connections--;
DEBUGF(infof(conn->data, "The cache now contains %"
CURL_FORMAT_CURL_OFF_TU " members\n",
(curl_off_t) 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,
Return 0 from func() to continue the loop, return 1 to abort it.
*/
void Curl_conncache_foreach(struct conncache *connc,
void *param,
int (*func)(struct connectdata *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;
bundle = he->ptr;
he = Curl_hash_next_element(&iter);
curr = bundle->conn_list.head;
while(curr) {
/* Yes, we need to update curr before calling func(), because func()
might decide to remove the connection */
struct connectdata *conn = curr->ptr;
curr = curr->next;
if(1 == func(conn, param))
return;
}
}
}
/* 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_hash_element *he;
struct connectbundle *bundle;
Curl_hash_start_iterate(&connc->hash, &iter);
he = Curl_hash_next_element(&iter);
while(he) {
struct curl_llist_element *curr;
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