Mercurial > hg > nginx

comparison src/http/modules/ngx_http_upstream_zone_module.c @ 6103:79ddb0bdb273

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Upstream: the "zone" directive. Upstreams with the "zone" directive are kept in shared memory, with a consistent view of all worker processes.
author Ruslan Ermilov <ru@nginx.com>
date Tue, 14 Apr 2015 19:01:25 +0300
parents
children caa103acf180
comparison
equal deleted inserted replaced
6102:3264b7828f72 6103:79ddb0bdb273
1
2 /*
3 * Copyright (C) Ruslan Ermilov
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_http.h>
11
12
13 static char *ngx_http_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd,
14 void *conf);
15 static ngx_int_t ngx_http_upstream_init_zone(ngx_shm_zone_t *shm_zone,
16 void *data);
17
18
19 static ngx_command_t ngx_http_upstream_zone_commands[] = {
20
21 { ngx_string("zone"),
22 NGX_HTTP_UPS_CONF|NGX_CONF_TAKE2,
23 ngx_http_upstream_zone,
24 0,
25 0,
26 NULL },
27
28 ngx_null_command
29 };
30
31
32 static ngx_http_module_t ngx_http_upstream_zone_module_ctx = {
33 NULL, /* preconfiguration */
34 NULL, /* postconfiguration */
35
36 NULL, /* create main configuration */
37 NULL, /* init main configuration */
38
39 NULL, /* create server configuration */
40 NULL, /* merge server configuration */
41
42 NULL, /* create location configuration */
43 NULL /* merge location configuration */
44 };
45
46
47 ngx_module_t ngx_http_upstream_zone_module = {
48 NGX_MODULE_V1,
49 &ngx_http_upstream_zone_module_ctx, /* module context */
50 ngx_http_upstream_zone_commands, /* module directives */
51 NGX_HTTP_MODULE, /* module type */
52 NULL, /* init master */
53 NULL, /* init module */
54 NULL, /* init process */
55 NULL, /* init thread */
56 NULL, /* exit thread */
57 NULL, /* exit process */
58 NULL, /* exit master */
59 NGX_MODULE_V1_PADDING
60 };
61
62
63 static char *
64 ngx_http_upstream_zone(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
65 {
66 ngx_http_upstream_srv_conf_t *uscf;
67 ssize_t size;
68 ngx_str_t *value;
69
70 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
71
72 value = cf->args->elts;
73
74 if (!value[1].len) {
75 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
76 "invalid zone name \"%V\"", &value[1]);
77 return NGX_CONF_ERROR;
78 }
79
80 size = ngx_parse_size(&value[2]);
81
82 if (size == NGX_ERROR) {
83 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
84 "invalid zone size \"%V\"", &value[2]);
85 return NGX_CONF_ERROR;
86 }
87
88 if (size < (ssize_t) (8 * ngx_pagesize)) {
89 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
90 "zone \"%V\" is too small", &value[1]);
91 return NGX_CONF_ERROR;
92 }
93
94 uscf->shm_zone = ngx_shared_memory_add(cf, &value[1], size,
95 &ngx_http_upstream_module);
96 if (uscf->shm_zone == NULL) {
97 return NGX_CONF_ERROR;
98 }
99
100 if (uscf->shm_zone->data) {
101 uscf = uscf->shm_zone->data;
102
103 ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
104 "upstream \"%V\" in %s:%ui "
105 "is already bound to zone \"%V\"",
106 &uscf->host, uscf->file_name, uscf->line,
107 &value[1]);
108 return NGX_CONF_ERROR;
109 }
110
111 uscf->shm_zone->init = ngx_http_upstream_init_zone;
112 uscf->shm_zone->data = uscf;
113
114 uscf->shm_zone->noreuse = 1;
115
116 return NGX_CONF_OK;
117 }
118
119
120 static ngx_int_t
121 ngx_http_upstream_init_zone(ngx_shm_zone_t *shm_zone, void *data)
122 {
123 ngx_http_upstream_srv_conf_t *ouscf = data;
124
125 size_t len;
126 ngx_slab_pool_t *shpool;
127 ngx_http_upstream_rr_peer_t *peer, **peerp;
128 ngx_http_upstream_rr_peers_t *peers, *backup;
129 ngx_http_upstream_srv_conf_t *uscf;
130
131 uscf = shm_zone->data;
132
133 if (ouscf) {
134 ngx_log_error(NGX_LOG_EMERG, shm_zone->shm.log, 0,
135 "zone \"%V\" cannot be reused", &shm_zone->shm.name);
136 return NGX_ERROR;
137 }
138
139 shpool = (ngx_slab_pool_t *) shm_zone->shm.addr;
140
141 if (shm_zone->shm.exists) {
142 return NGX_ERROR;
143 }
144
145
146 /* copy peers to shared memory */
147
148 len = sizeof(" in upstream zone \"\"") + shm_zone->shm.name.len;
149
150 shpool->log_ctx = ngx_slab_alloc(shpool, len);
151 if (shpool->log_ctx == NULL) {
152 return NGX_ERROR;
153 }
154
155 ngx_sprintf(shpool->log_ctx, " in upstream zone \"%V\"%Z",
156 &shm_zone->shm.name);
157
158 peers = ngx_slab_alloc(shpool, sizeof(ngx_http_upstream_rr_peers_t));
159 if (peers == NULL) {
160 return NGX_ERROR;
161 }
162
163 ngx_memcpy(peers, uscf->peer.data, sizeof(ngx_http_upstream_rr_peers_t));
164
165 peers->shpool = shpool;
166
167 for (peerp = &peers->peer; *peerp; peerp = &peer->next) {
168 /* pool is unlocked */
169 peer = ngx_slab_calloc_locked(shpool,
170 sizeof(ngx_http_upstream_rr_peer_t));
171 if (peer == NULL) {
172 return NGX_ERROR;
173 }
174
175 ngx_memcpy(peer, *peerp, sizeof(ngx_http_upstream_rr_peer_t));
176
177 *peerp = peer;
178 }
179
180 if (peers->next == NULL) {
181 goto done;
182 }
183
184 backup = ngx_slab_alloc(shpool, sizeof(ngx_http_upstream_rr_peers_t));
185 if (backup == NULL) {
186 return NGX_ERROR;
187 }
188
189 ngx_memcpy(backup, peers->next, sizeof(ngx_http_upstream_rr_peers_t));
190
191 backup->shpool = shpool;
192
193 for (peerp = &backup->peer; *peerp; peerp = &peer->next) {
194 /* pool is unlocked */
195 peer = ngx_slab_calloc_locked(shpool,
196 sizeof(ngx_http_upstream_rr_peer_t));
197 if (peer == NULL) {
198 return NGX_ERROR;
199 }
200
201 ngx_memcpy(peer, *peerp, sizeof(ngx_http_upstream_rr_peer_t));
202
203 *peerp = peer;
204 }
205
206 peers->next = backup;
207
208 done:
209
210 uscf->peer.data = peers;
211
212 return NGX_OK;
213 }