Mercurial > hg > nginx-quic
annotate src/http/modules/ngx_http_upstream_ip_hash_module.c @ 7524:deebe988cbd7
Perl: reworked perl module to pass ctx instead of request.
This ensures that correct ctx is always available, including after
filter finalization. In particular, this fixes a segmentation fault
with the following configuration:
location / {
image_filter test;
perl 'sub {
my $r = shift;
$r->send_http_header();
$r->print("foo\n");
$r->print("bar\n");
}';
}
This also seems to be the only way to correctly handle filter finalization
in various complex cases, for example, when embedded perl is used both
in the original handler and in an error page called after filter
finalization.
author | Maxim Dounin <mdounin@mdounin.ru> |
---|---|
date | Fri, 12 Jul 2019 11:29:22 +0300 |
parents | ed599ea6c1f1 |
children |
rev | line source |
---|---|
884 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
884 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 #include <ngx_http.h> | |
11 | |
12 | |
13 typedef struct { | |
14 /* the round robin data must be first */ | |
15 ngx_http_upstream_rr_peer_data_t rrp; | |
16 | |
17 ngx_uint_t hash; | |
18 | |
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19 u_char addrlen; |
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20 u_char *addr; |
884 | 21 |
22 u_char tries; | |
23 | |
24 ngx_event_get_peer_pt get_rr_peer; | |
25 } ngx_http_upstream_ip_hash_peer_data_t; | |
26 | |
27 | |
28 static ngx_int_t ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, | |
29 ngx_http_upstream_srv_conf_t *us); | |
30 static ngx_int_t ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, | |
31 void *data); | |
32 static char *ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, | |
33 void *conf); | |
34 | |
35 | |
36 static ngx_command_t ngx_http_upstream_ip_hash_commands[] = { | |
37 | |
38 { ngx_string("ip_hash"), | |
39 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS, | |
40 ngx_http_upstream_ip_hash, | |
41 0, | |
42 0, | |
43 NULL }, | |
44 | |
45 ngx_null_command | |
46 }; | |
47 | |
48 | |
49 static ngx_http_module_t ngx_http_upstream_ip_hash_module_ctx = { | |
50 NULL, /* preconfiguration */ | |
51 NULL, /* postconfiguration */ | |
52 | |
53 NULL, /* create main configuration */ | |
54 NULL, /* init main configuration */ | |
55 | |
56 NULL, /* create server configuration */ | |
57 NULL, /* merge server configuration */ | |
58 | |
59 NULL, /* create location configuration */ | |
60 NULL /* merge location configuration */ | |
61 }; | |
62 | |
63 | |
64 ngx_module_t ngx_http_upstream_ip_hash_module = { | |
65 NGX_MODULE_V1, | |
66 &ngx_http_upstream_ip_hash_module_ctx, /* module context */ | |
67 ngx_http_upstream_ip_hash_commands, /* module directives */ | |
68 NGX_HTTP_MODULE, /* module type */ | |
69 NULL, /* init master */ | |
70 NULL, /* init module */ | |
71 NULL, /* init process */ | |
72 NULL, /* init thread */ | |
73 NULL, /* exit thread */ | |
74 NULL, /* exit process */ | |
75 NULL, /* exit master */ | |
76 NGX_MODULE_V1_PADDING | |
77 }; | |
78 | |
79 | |
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80 static u_char ngx_http_upstream_ip_hash_pseudo_addr[3]; |
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81 |
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82 |
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83 static ngx_int_t |
884 | 84 ngx_http_upstream_init_ip_hash(ngx_conf_t *cf, ngx_http_upstream_srv_conf_t *us) |
85 { | |
86 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) { | |
87 return NGX_ERROR; | |
88 } | |
89 | |
90 us->peer.init = ngx_http_upstream_init_ip_hash_peer; | |
91 | |
92 return NGX_OK; | |
93 } | |
94 | |
95 | |
96 static ngx_int_t | |
97 ngx_http_upstream_init_ip_hash_peer(ngx_http_request_t *r, | |
98 ngx_http_upstream_srv_conf_t *us) | |
99 { | |
100 struct sockaddr_in *sin; | |
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101 #if (NGX_HAVE_INET6) |
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102 struct sockaddr_in6 *sin6; |
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103 #endif |
884 | 104 ngx_http_upstream_ip_hash_peer_data_t *iphp; |
105 | |
106 iphp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_ip_hash_peer_data_t)); | |
107 if (iphp == NULL) { | |
108 return NGX_ERROR; | |
109 } | |
110 | |
111 r->upstream->peer.data = &iphp->rrp; | |
112 | |
113 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) { | |
114 return NGX_ERROR; | |
115 } | |
116 | |
117 r->upstream->peer.get = ngx_http_upstream_get_ip_hash_peer; | |
118 | |
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119 switch (r->connection->sockaddr->sa_family) { |
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120 |
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121 case AF_INET: |
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122 sin = (struct sockaddr_in *) r->connection->sockaddr; |
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123 iphp->addr = (u_char *) &sin->sin_addr.s_addr; |
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124 iphp->addrlen = 3; |
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125 break; |
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126 |
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127 #if (NGX_HAVE_INET6) |
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128 case AF_INET6: |
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129 sin6 = (struct sockaddr_in6 *) r->connection->sockaddr; |
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130 iphp->addr = (u_char *) &sin6->sin6_addr.s6_addr; |
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131 iphp->addrlen = 16; |
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132 break; |
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133 #endif |
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134 |
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135 default: |
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136 iphp->addr = ngx_http_upstream_ip_hash_pseudo_addr; |
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137 iphp->addrlen = 3; |
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138 } |
884 | 139 |
140 iphp->hash = 89; | |
141 iphp->tries = 0; | |
142 iphp->get_rr_peer = ngx_http_upstream_get_round_robin_peer; | |
143 | |
144 return NGX_OK; | |
145 } | |
146 | |
147 | |
148 static ngx_int_t | |
149 ngx_http_upstream_get_ip_hash_peer(ngx_peer_connection_t *pc, void *data) | |
150 { | |
151 ngx_http_upstream_ip_hash_peer_data_t *iphp = data; | |
152 | |
153 time_t now; | |
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154 ngx_int_t w; |
884 | 155 uintptr_t m; |
156 ngx_uint_t i, n, p, hash; | |
157 ngx_http_upstream_rr_peer_t *peer; | |
158 | |
159 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0, | |
160 "get ip hash peer, try: %ui", pc->tries); | |
161 | |
162 /* TODO: cached */ | |
163 | |
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164 ngx_http_upstream_rr_peers_rlock(iphp->rrp.peers); |
6102 | 165 |
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166 if (iphp->tries > 20 || iphp->rrp.peers->single) { |
6102 | 167 ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers); |
884 | 168 return iphp->get_rr_peer(pc, &iphp->rrp); |
169 } | |
170 | |
171 now = ngx_time(); | |
172 | |
173 pc->cached = 0; | |
174 pc->connection = NULL; | |
175 | |
176 hash = iphp->hash; | |
177 | |
178 for ( ;; ) { | |
179 | |
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180 for (i = 0; i < (ngx_uint_t) iphp->addrlen; i++) { |
884 | 181 hash = (hash * 113 + iphp->addr[i]) % 6271; |
182 } | |
183 | |
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184 w = hash % iphp->rrp.peers->total_weight; |
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185 peer = iphp->rrp.peers->peer; |
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186 p = 0; |
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187 |
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188 while (w >= peer->weight) { |
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189 w -= peer->weight; |
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190 peer = peer->next; |
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191 p++; |
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192 } |
884 | 193 |
194 n = p / (8 * sizeof(uintptr_t)); | |
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195 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t)); |
884 | 196 |
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197 if (iphp->rrp.tried[n] & m) { |
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198 goto next; |
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199 } |
884 | 200 |
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201 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
6480 | 202 "get ip hash peer, hash: %ui %04XL", p, (uint64_t) m); |
884 | 203 |
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204 ngx_http_upstream_rr_peer_lock(iphp->rrp.peers, peer); |
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205 |
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206 if (peer->down) { |
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207 ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); |
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208 goto next; |
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209 } |
884 | 210 |
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211 if (peer->max_fails |
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212 && peer->fails >= peer->max_fails |
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213 && now - peer->checked <= peer->fail_timeout) |
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214 { |
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215 ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); |
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216 goto next; |
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217 } |
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218 |
6705 | 219 if (peer->max_conns && peer->conns >= peer->max_conns) { |
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220 ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); |
6705 | 221 goto next; |
222 } | |
223 | |
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224 break; |
884 | 225 |
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226 next: |
884 | 227 |
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228 if (++iphp->tries > 20) { |
6102 | 229 ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers); |
884 | 230 return iphp->get_rr_peer(pc, &iphp->rrp); |
231 } | |
232 } | |
233 | |
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234 iphp->rrp.current = peer; |
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235 |
884 | 236 pc->sockaddr = peer->sockaddr; |
237 pc->socklen = peer->socklen; | |
238 pc->name = &peer->name; | |
239 | |
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240 peer->conns++; |
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241 |
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242 if (now - peer->checked > peer->fail_timeout) { |
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243 peer->checked = now; |
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244 } |
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245 |
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246 ngx_http_upstream_rr_peer_unlock(iphp->rrp.peers, peer); |
6102 | 247 ngx_http_upstream_rr_peers_unlock(iphp->rrp.peers); |
884 | 248 |
249 iphp->rrp.tried[n] |= m; | |
250 iphp->hash = hash; | |
251 | |
252 return NGX_OK; | |
253 } | |
254 | |
255 | |
256 static char * | |
257 ngx_http_upstream_ip_hash(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) | |
258 { | |
259 ngx_http_upstream_srv_conf_t *uscf; | |
260 | |
261 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module); | |
262 | |
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263 if (uscf->peer.init_upstream) { |
5373be93c0be
Upstream: warn if multiple non-stackable balancers are installed.
Ruslan Ermilov <ru@nginx.com>
parents:
4695
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264 ngx_conf_log_error(NGX_LOG_WARN, cf, 0, |
5373be93c0be
Upstream: warn if multiple non-stackable balancers are installed.
Ruslan Ermilov <ru@nginx.com>
parents:
4695
diff
changeset
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265 "load balancing method redefined"); |
5373be93c0be
Upstream: warn if multiple non-stackable balancers are installed.
Ruslan Ermilov <ru@nginx.com>
parents:
4695
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266 } |
5373be93c0be
Upstream: warn if multiple non-stackable balancers are installed.
Ruslan Ermilov <ru@nginx.com>
parents:
4695
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267 |
884 | 268 uscf->peer.init_upstream = ngx_http_upstream_init_ip_hash; |
269 | |
270 uscf->flags = NGX_HTTP_UPSTREAM_CREATE | |
4655
382c523d253a
Upstream: weights support in ip_hash balancer.
Maxim Dounin <mdounin@mdounin.ru>
parents:
4412
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271 |NGX_HTTP_UPSTREAM_WEIGHT |
6705 | 272 |NGX_HTTP_UPSTREAM_MAX_CONNS |
884 | 273 |NGX_HTTP_UPSTREAM_MAX_FAILS |
274 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT | |
275 |NGX_HTTP_UPSTREAM_DOWN; | |
276 | |
277 return NGX_CONF_OK; | |
278 } |