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