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Upstream hash: consistency across little/big endianness.

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This commit is contained in:
Sergey Kandaurov 2015-05-18 16:05:44 +03:00
parent 7c48049b72
commit 1ac2ceeb8d
2 changed files with 30 additions and 8 deletions
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19
src/http/modules/ngx_http_upstream_hash_module.c
View file

@ -277,13 +277,17 @@ ngx_http_upstream_init_chash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
{
u_char *host, *port, c;
size_t host_len, port_len, size;
uint32_t hash, base_hash, prev_hash;
uint32_t hash, base_hash;
ngx_str_t *server;
ngx_uint_t npoints, i, j;
ngx_http_upstream_rr_peer_t *peer;
ngx_http_upstream_rr_peers_t *peers;
ngx_http_upstream_chash_points_t *points;
ngx_http_upstream_hash_srv_conf_t *hcf;
union {
uint32_t value;
u_char byte[4];
} prev_hash;
if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
return NGX_ERROR;
@ -350,20 +354,27 @@ ngx_http_upstream_init_chash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us)
ngx_crc32_update(&base_hash, (u_char *) "", 1);
ngx_crc32_update(&base_hash, port, port_len);
prev_hash = 0;
prev_hash.value = 0;
npoints = peer->weight * 160;
for (j = 0; j < npoints; j++) {
hash = base_hash;
ngx_crc32_update(&hash, (u_char *) &prev_hash, sizeof(uint32_t));
ngx_crc32_update(&hash, prev_hash.byte, 4);
ngx_crc32_final(hash);
points->point[points->number].hash = hash;
points->point[points->number].server = server;
points->number++;
prev_hash = hash;
#if (NGX_HAVE_LITTLE_ENDIAN)
prev_hash.value = hash;
#else
prev_hash.byte[0] = (u_char) (hash & 0xff);
prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff);
prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff);
prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff);
#endif
}
}

19
src/stream/ngx_stream_upstream_hash_module.c
View file

@ -271,13 +271,17 @@ ngx_stream_upstream_init_chash(ngx_conf_t *cf,
{
u_char *host, *port, c;
size_t host_len, port_len, size;
uint32_t hash, base_hash, prev_hash;
uint32_t hash, base_hash;
ngx_str_t *server;
ngx_uint_t npoints, i, j;
ngx_stream_upstream_rr_peer_t *peer;
ngx_stream_upstream_rr_peers_t *peers;
ngx_stream_upstream_chash_points_t *points;
ngx_stream_upstream_hash_srv_conf_t *hcf;
union {
uint32_t value;
u_char byte[4];
} prev_hash;
if (ngx_stream_upstream_init_round_robin(cf, us) != NGX_OK) {
return NGX_ERROR;
@ -344,20 +348,27 @@ ngx_stream_upstream_init_chash(ngx_conf_t *cf,
ngx_crc32_update(&base_hash, (u_char *) "", 1);
ngx_crc32_update(&base_hash, port, port_len);
prev_hash = 0;
prev_hash.value = 0;
npoints = peer->weight * 160;
for (j = 0; j < npoints; j++) {
hash = base_hash;
ngx_crc32_update(&hash, (u_char *) &prev_hash, sizeof(uint32_t));
ngx_crc32_update(&hash, prev_hash.byte, 4);
ngx_crc32_final(hash);
points->point[points->number].hash = hash;
points->point[points->number].server = server;
points->number++;
prev_hash = hash;
#if (NGX_HAVE_LITTLE_ENDIAN)
prev_hash.value = hash;
#else
prev_hash.byte[0] = (u_char) (hash & 0xff);
prev_hash.byte[1] = (u_char) ((hash >> 8) & 0xff);
prev_hash.byte[2] = (u_char) ((hash >> 16) & 0xff);
prev_hash.byte[3] = (u_char) ((hash >> 24) & 0xff);
#endif
}
}