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conncache: make hashkey avoid malloc 

... to make it much faster. Idea developed with primepie on IRC.

Closes #1365
This commit is contained in:
Daniel Stenberg 2017-03-28 19:18:24 +02:00
parent 2549831daa
commit 2066072ff2
1 changed files with 15 additions and 18 deletions
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33
lib/conncache.c
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@ -5,8 +5,8 @@
* | (__| |_| | _ <| |___
* \___|\___/|_| \_\_____|
*
* Copyright (C) 2012, 2016, Linus Nielsen Feltzing, <linus@haxx.se>
* Copyright (C) 2012 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al.
* 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
@ -127,8 +127,9 @@ void Curl_conncache_destroy(struct conncache *connc)
Curl_hash_destroy(&connc->hash);
}
/* returns an allocated key to find a bundle for this connection */
static char *hashkey(struct connectdata *conn)
/* 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;
@ -141,7 +142,10 @@ static char *hashkey(struct connectdata *conn)
else
hostname = conn->host.name;
return aprintf("%s:%ld", hostname, conn->port);
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
@ -151,11 +155,9 @@ struct connectbundle *Curl_conncache_find_bundle(struct connectdata *conn,
{
struct connectbundle *bundle = NULL;
if(connc) {
char *key = hashkey(conn);
if(key) {
bundle = Curl_hash_pick(&connc->hash, key, strlen(key));
free(key);
}
char key[128];
hashkey(conn, key, sizeof(key));
bundle = Curl_hash_pick(&connc->hash, key, strlen(key));
}
return bundle;
@ -204,21 +206,16 @@ CURLcode Curl_conncache_add_conn(struct conncache *connc,
bundle = Curl_conncache_find_bundle(conn, data->state.conn_cache);
if(!bundle) {
char *key;
int rc;
char key[128];
result = bundle_create(data, &new_bundle);
if(result)
return result;
key = hashkey(conn);
if(!key) {
bundle_destroy(new_bundle);
return CURLE_OUT_OF_MEMORY;
}
hashkey(conn, key, sizeof(key));
rc = conncache_add_bundle(data->state.conn_cache, key, new_bundle);
free(key);
if(!rc) {
bundle_destroy(new_bundle);
return CURLE_OUT_OF_MEMORY;