ngx_stream_upstream_zone_module.c
/*
* Copyright (C) Ruslan Ermilov
* Copyright (C) Nginx, Inc.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_stream.h>
static char *ngx_stream_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd,
void *conf);
static ngx_int_t ngx_stream_upstream_init_zone(ngx_shm_zone_t *shm_zone,
void *data);
static ngx_stream_upstream_rr_peers_t *ngx_stream_upstream_zone_copy_peers(
ngx_slab_pool_t *shpool, ngx_stream_upstream_srv_conf_t *uscf);
static ngx_stream_upstream_rr_peer_t *ngx_stream_upstream_zone_copy_peer(
ngx_stream_upstream_rr_peers_t *peers, ngx_stream_upstream_rr_peer_t *src);
static ngx_command_t ngx_stream_upstream_zone_commands[] = {
{ ngx_string("zone"),
NGX_STREAM_UPS_CONF|NGX_CONF_TAKE12,
ngx_stream_upstream_zone,
0,
0,
NULL },
ngx_null_command
};
static ngx_stream_module_t ngx_stream_upstream_zone_module_ctx = {
NULL, /* preconfiguration */
NULL, /* postconfiguration */
NULL, /* create main configuration */
NULL, /* init main configuration */
NULL, /* create server configuration */
NULL /* merge server configuration */
};
ngx_module_t ngx_stream_upstream_zone_module = {
NGX_MODULE_V1,
&ngx_stream_upstream_zone_module_ctx, /* module context */
ngx_stream_upstream_zone_commands, /* module directives */
NGX_STREAM_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
NULL, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
static char *
ngx_stream_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ssize_t size;
ngx_str_t *value;
ngx_stream_upstream_srv_conf_t *uscf;
ngx_stream_upstream_main_conf_t *umcf;
uscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_upstream_module);
umcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_upstream_module);
value = cf->args->elts;
if (!value[1].len) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid zone name \"%V\"", &value[1]);
return NGX_CONF_ERROR;
}
if (cf->args->nelts == 3) {
size = ngx_parse_size(&value[2]);
if (size == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"invalid zone size \"%V\"", &value[2]);
return NGX_CONF_ERROR;
}
if (size < (ssize_t) (8 * ngx_pagesize)) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"zone \"%V\" is too small", &value[1]);
return NGX_CONF_ERROR;
}
} else {
size = 0;
}
uscf->shm_zone = ngx_shared_memory_add(cf, &value[1], size,
&ngx_stream_upstream_module);
if (uscf->shm_zone == NULL) {
return NGX_CONF_ERROR;
}
uscf->shm_zone->init = ngx_stream_upstream_init_zone;
uscf->shm_zone->data = umcf;
uscf->shm_zone->noreuse = 1;
return NGX_CONF_OK;
}
static ngx_int_t
ngx_stream_upstream_init_zone(ngx_shm_zone_t *shm_zone, void *data)
{
size_t len;
ngx_uint_t i;
ngx_slab_pool_t *shpool;
ngx_stream_upstream_rr_peers_t *peers, **peersp;
ngx_stream_upstream_srv_conf_t *uscf, **uscfp;
ngx_stream_upstream_main_conf_t *umcf;
shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
umcf = shm_zone->data;
uscfp = umcf->upstreams.elts;
if (shm_zone->shm.exists) {
peers = shpool->data;
for (i = 0; i < umcf->upstreams.nelts; i++) {
uscf = uscfp[i];
if (uscf->shm_zone != shm_zone) {
continue;
}
uscf->peer.data = peers;
peers = peers->zone_next;
}
return NGX_OK;
}
len = sizeof(" in upstream zone \"\"") + shm_zone->shm.name.len;
shpool->log_ctx = ngx_slab_alloc(shpool, len);
if (shpool->log_ctx == NULL) {
return NGX_ERROR;
}
ngx_sprintf(shpool->log_ctx, " in upstream zone \"%V\"%Z",
&shm_zone->shm.name);
/* copy peers to shared memory */
peersp = (ngx_stream_upstream_rr_peers_t **) (void *) &shpool->data;
for (i = 0; i < umcf->upstreams.nelts; i++) {
uscf = uscfp[i];
if (uscf->shm_zone != shm_zone) {
continue;
}
peers = ngx_stream_upstream_zone_copy_peers(shpool, uscf);
if (peers == NULL) {
return NGX_ERROR;
}
*peersp = peers;
peersp = &peers->zone_next;
}
return NGX_OK;
}
static ngx_stream_upstream_rr_peers_t *
ngx_stream_upstream_zone_copy_peers(ngx_slab_pool_t *shpool,
ngx_stream_upstream_srv_conf_t *uscf)
{
ngx_str_t *name;
ngx_stream_upstream_rr_peer_t *peer, **peerp;
ngx_stream_upstream_rr_peers_t *peers, *backup;
peers = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t));
if (peers == NULL) {
return NULL;
}
ngx_memcpy(peers, uscf->peer.data, sizeof(ngx_stream_upstream_rr_peers_t));
name = ngx_slab_alloc(shpool, sizeof(ngx_str_t));
if (name == NULL) {
return NULL;
}
name->data = ngx_slab_alloc(shpool, peers->name->len);
if (name->data == NULL) {
return NULL;
}
ngx_memcpy(name->data, peers->name->data, peers->name->len);
name->len = peers->name->len;
peers->name = name;
peers->shpool = shpool;
for (peerp = &peers->peer; *peerp; peerp = &peer->next) {
/* pool is unlocked */
peer = ngx_stream_upstream_zone_copy_peer(peers, *peerp);
if (peer == NULL) {
return NULL;
}
*peerp = peer;
}
if (peers->next == NULL) {
goto done;
}
backup = ngx_slab_alloc(shpool, sizeof(ngx_stream_upstream_rr_peers_t));
if (backup == NULL) {
return NULL;
}
ngx_memcpy(backup, peers->next, sizeof(ngx_stream_upstream_rr_peers_t));
backup->name = name;
backup->shpool = shpool;
for (peerp = &backup->peer; *peerp; peerp = &peer->next) {
/* pool is unlocked */
peer = ngx_stream_upstream_zone_copy_peer(backup, *peerp);
if (peer == NULL) {
return NULL;
}
*peerp = peer;
}
peers->next = backup;
done:
uscf->peer.data = peers;
return peers;
}
static ngx_stream_upstream_rr_peer_t *
ngx_stream_upstream_zone_copy_peer(ngx_stream_upstream_rr_peers_t *peers,
ngx_stream_upstream_rr_peer_t *src)
{
ngx_slab_pool_t *pool;
ngx_stream_upstream_rr_peer_t *dst;
pool = peers->shpool;
dst = ngx_slab_calloc_locked(pool, sizeof(ngx_stream_upstream_rr_peer_t));
if (dst == NULL) {
return NULL;
}
if (src) {
ngx_memcpy(dst, src, sizeof(ngx_stream_upstream_rr_peer_t));
dst->sockaddr = NULL;
dst->name.data = NULL;
dst->server.data = NULL;
}
dst->sockaddr = ngx_slab_calloc_locked(pool, sizeof(ngx_sockaddr_t));
if (dst->sockaddr == NULL) {
goto failed;
}
dst->name.data = ngx_slab_calloc_locked(pool, NGX_SOCKADDR_STRLEN);
if (dst->name.data == NULL) {
goto failed;
}
if (src) {
ngx_memcpy(dst->sockaddr, src->sockaddr, src->socklen);
ngx_memcpy(dst->name.data, src->name.data, src->name.len);
dst->server.data = ngx_slab_alloc_locked(pool, src->server.len);
if (dst->server.data == NULL) {
goto failed;
}
ngx_memcpy(dst->server.data, src->server.data, src->server.len);
}
return dst;
failed:
if (dst->server.data) {
ngx_slab_free_locked(pool, dst->server.data);
}
if (dst->name.data) {
ngx_slab_free_locked(pool, dst->name.data);
}
if (dst->sockaddr) {
ngx_slab_free_locked(pool, dst->sockaddr);
}
ngx_slab_free_locked(pool, dst);
return NULL;
}
