annotate src/http/modules/ngx_http_upstream_least_conn_module.c @ 694:88a1b4797f2e NGINX_1_3_10

nginx 1.3.10 *) Change: domain names specified in configuration file are now resolved to IPv6 addresses as well as IPv4 ones. *) Change: now if the "include" directive with mask is used on Unix systems, included files are sorted in alphabetical order. *) Change: the "add_header" directive adds headers to 201 responses. *) Feature: the "geo" directive now supports IPv6 addresses in CIDR notation. *) Feature: the "flush" and "gzip" parameters of the "access_log" directive. *) Feature: variables support in the "auth_basic" directive. *) Bugfix: nginx could not be built with the ngx_http_perl_module in some cases. *) Bugfix: a segmentation fault might occur in a worker process if the ngx_http_xslt_module was used. *) Bugfix: nginx could not be built on MacOSX in some cases. Thanks to Piotr Sikora. *) Bugfix: the "limit_rate" directive with high rates might result in truncated responses on 32-bit platforms. Thanks to Alexey Antropov. *) Bugfix: a segmentation fault might occur in a worker process if the "if" directive was used. Thanks to Piotr Sikora. *) Bugfix: a "100 Continue" response was issued with "413 Request Entity Too Large" responses. *) Bugfix: the "image_filter", "image_filter_jpeg_quality" and "image_filter_sharpen" directives might be inherited incorrectly. Thanks to Ian Babrou. *) Bugfix: "crypt_r() failed" errors might appear if the "auth_basic" directive was used on Linux. *) Bugfix: in backup servers handling. Thanks to Thomas Chen. *) Bugfix: proxied HEAD requests might return incorrect response if the "gzip" directive was used.
author Igor Sysoev <http://sysoev.ru>
date Tue, 25 Dec 2012 00:00:00 +0400
parents 5cb5db9975ba
children
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1
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2 /*
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3 * Copyright (C) Maxim Dounin
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7
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8 #include <ngx_config.h>
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9 #include <ngx_core.h>
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10 #include <ngx_http.h>
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11
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12
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13 typedef struct {
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14 ngx_uint_t *conns;
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15 } ngx_http_upstream_least_conn_conf_t;
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16
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17
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18 typedef struct {
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19 /* the round robin data must be first */
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20 ngx_http_upstream_rr_peer_data_t rrp;
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21
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22 ngx_uint_t *conns;
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23
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24 ngx_event_get_peer_pt get_rr_peer;
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25 ngx_event_free_peer_pt free_rr_peer;
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26 } ngx_http_upstream_lc_peer_data_t;
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27
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29 static ngx_int_t ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r,
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30 ngx_http_upstream_srv_conf_t *us);
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31 static ngx_int_t ngx_http_upstream_get_least_conn_peer(
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32 ngx_peer_connection_t *pc, void *data);
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33 static void ngx_http_upstream_free_least_conn_peer(ngx_peer_connection_t *pc,
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34 void *data, ngx_uint_t state);
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35 static void *ngx_http_upstream_least_conn_create_conf(ngx_conf_t *cf);
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36 static char *ngx_http_upstream_least_conn(ngx_conf_t *cf, ngx_command_t *cmd,
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37 void *conf);
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38
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39
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40 static ngx_command_t ngx_http_upstream_least_conn_commands[] = {
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41
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42 { ngx_string("least_conn"),
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43 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS,
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44 ngx_http_upstream_least_conn,
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45 0,
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46 0,
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47 NULL },
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48
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49 ngx_null_command
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50 };
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51
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52
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53 static ngx_http_module_t ngx_http_upstream_least_conn_module_ctx = {
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54 NULL, /* preconfiguration */
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55 NULL, /* postconfiguration */
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56
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57 NULL, /* create main configuration */
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58 NULL, /* init main configuration */
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59
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60 ngx_http_upstream_least_conn_create_conf, /* create server configuration */
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61 NULL, /* merge server configuration */
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62
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63 NULL, /* create location configuration */
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64 NULL /* merge location configuration */
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65 };
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66
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67
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68 ngx_module_t ngx_http_upstream_least_conn_module = {
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69 NGX_MODULE_V1,
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70 &ngx_http_upstream_least_conn_module_ctx, /* module context */
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71 ngx_http_upstream_least_conn_commands, /* module directives */
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72 NGX_HTTP_MODULE, /* module type */
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73 NULL, /* init master */
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74 NULL, /* init module */
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75 NULL, /* init process */
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76 NULL, /* init thread */
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77 NULL, /* exit thread */
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78 NULL, /* exit process */
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79 NULL, /* exit master */
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80 NGX_MODULE_V1_PADDING
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81 };
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82
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83
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84 static ngx_int_t
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85 ngx_http_upstream_init_least_conn(ngx_conf_t *cf,
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86 ngx_http_upstream_srv_conf_t *us)
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87 {
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88 ngx_uint_t n;
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89 ngx_http_upstream_rr_peers_t *peers;
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90 ngx_http_upstream_least_conn_conf_t *lcf;
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91
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92 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0,
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93 "init least conn");
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94
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95 if (ngx_http_upstream_init_round_robin(cf, us) != NGX_OK) {
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96 return NGX_ERROR;
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97 }
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98
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99 peers = us->peer.data;
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100
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101 n = peers->number;
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102
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103 if (peers->next) {
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104 n += peers->next->number;
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105 }
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106
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107 lcf = ngx_http_conf_upstream_srv_conf(us,
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108 ngx_http_upstream_least_conn_module);
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109
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110 lcf->conns = ngx_pcalloc(cf->pool, sizeof(ngx_uint_t) * n);
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111 if (lcf->conns == NULL) {
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112 return NGX_ERROR;
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113 }
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114
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115 us->peer.init = ngx_http_upstream_init_least_conn_peer;
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116
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117 return NGX_OK;
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118 }
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119
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120
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121 static ngx_int_t
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122 ngx_http_upstream_init_least_conn_peer(ngx_http_request_t *r,
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123 ngx_http_upstream_srv_conf_t *us)
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124 {
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125 ngx_http_upstream_lc_peer_data_t *lcp;
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126 ngx_http_upstream_least_conn_conf_t *lcf;
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127
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128 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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129 "init least conn peer");
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130
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131 lcf = ngx_http_conf_upstream_srv_conf(us,
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132 ngx_http_upstream_least_conn_module);
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133
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134 lcp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_lc_peer_data_t));
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135 if (lcp == NULL) {
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136 return NGX_ERROR;
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137 }
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138
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139 lcp->conns = lcf->conns;
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140
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141 r->upstream->peer.data = &lcp->rrp;
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142
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143 if (ngx_http_upstream_init_round_robin_peer(r, us) != NGX_OK) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
144 return NGX_ERROR;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
145 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
146
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
147 r->upstream->peer.get = ngx_http_upstream_get_least_conn_peer;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
148 r->upstream->peer.free = ngx_http_upstream_free_least_conn_peer;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
149
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
150 lcp->get_rr_peer = ngx_http_upstream_get_round_robin_peer;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
151 lcp->free_rr_peer = ngx_http_upstream_free_round_robin_peer;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
152
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
153 return NGX_OK;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
154 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
155
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
156
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
157 static ngx_int_t
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
158 ngx_http_upstream_get_least_conn_peer(ngx_peer_connection_t *pc, void *data)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
159 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
160 ngx_http_upstream_lc_peer_data_t *lcp = data;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
161
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
162 time_t now;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
163 uintptr_t m;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
164 ngx_int_t rc, total;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
165 ngx_uint_t i, n, p, many;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
166 ngx_http_upstream_rr_peer_t *peer, *best;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
167 ngx_http_upstream_rr_peers_t *peers;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
168
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
169 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
170 "get least conn peer, try: %ui", pc->tries);
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
171
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
172 if (lcp->rrp.peers->single) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
173 return lcp->get_rr_peer(pc, &lcp->rrp);
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
174 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
175
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
176 pc->cached = 0;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
177 pc->connection = NULL;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
178
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
179 now = ngx_time();
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
180
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
181 peers = lcp->rrp.peers;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
182
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
183 best = NULL;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
184 total = 0;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
185
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
186 #if (NGX_SUPPRESS_WARN)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
187 many = 0;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
188 p = 0;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
189 #endif
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
190
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
191 for (i = 0; i < peers->number; i++) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
192
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
193 n = i / (8 * sizeof(uintptr_t));
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
194 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
195
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
196 if (lcp->rrp.tried[n] & m) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
197 continue;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
198 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
199
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
200 peer = &peers->peer[i];
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
201
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
202 if (peer->down) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
203 continue;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
204 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
205
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
206 if (peer->max_fails
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
207 && peer->fails >= peer->max_fails
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
208 && now - peer->checked <= peer->fail_timeout)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
209 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
210 continue;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
211 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
212
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
213 /*
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
214 * select peer with least number of connections; if there are
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
215 * multiple peers with the same number of connections, select
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
216 * based on round-robin
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
217 */
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
218
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
219 if (best == NULL
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
220 || lcp->conns[i] * best->weight < lcp->conns[p] * peer->weight)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
221 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
222 best = peer;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
223 many = 0;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
224 p = i;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
225
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
226 } else if (lcp->conns[i] * best->weight
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
227 == lcp->conns[p] * peer->weight)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
228 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
229 many = 1;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
230 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
231 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
232
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
233 if (best == NULL) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
234 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
235 "get least conn peer, no peer found");
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
236
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
237 goto failed;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
238 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
239
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
240 if (many) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
241 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
242 "get least conn peer, many");
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
243
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
244 for (i = p; i < peers->number; i++) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
245
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
246 n = i / (8 * sizeof(uintptr_t));
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
247 m = (uintptr_t) 1 << i % (8 * sizeof(uintptr_t));
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
248
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
249 if (lcp->rrp.tried[n] & m) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
250 continue;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
251 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
252
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
253 peer = &peers->peer[i];
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
254
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
255 if (peer->down) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
256 continue;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
257 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
258
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
259 if (lcp->conns[i] * best->weight != lcp->conns[p] * peer->weight) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
260 continue;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
261 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
262
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
263 if (peer->max_fails
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
264 && peer->fails >= peer->max_fails
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
265 && now - peer->checked <= peer->fail_timeout)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
266 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
267 continue;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
268 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
269
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
270 peer->current_weight += peer->effective_weight;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
271 total += peer->effective_weight;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
272
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
273 if (peer->effective_weight < peer->weight) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
274 peer->effective_weight++;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
275 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
276
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
277 if (peer->current_weight > best->current_weight) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
278 best = peer;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
279 p = i;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
280 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
281 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
282 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
283
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
284 best->current_weight -= total;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
285 best->checked = now;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
286
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
287 pc->sockaddr = best->sockaddr;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
288 pc->socklen = best->socklen;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
289 pc->name = &best->name;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
290
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
291 lcp->rrp.current = p;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
292
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
293 n = p / (8 * sizeof(uintptr_t));
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
294 m = (uintptr_t) 1 << p % (8 * sizeof(uintptr_t));
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
295
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
296 lcp->rrp.tried[n] |= m;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
297 lcp->conns[p]++;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
298
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
299 if (pc->tries == 1 && peers->next) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
300 pc->tries += peers->next->number;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
301 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
302
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
303 return NGX_OK;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
304
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
305 failed:
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
306
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
307 if (peers->next) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
308 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
309 "get least conn peer, backup servers");
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
310
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
311 lcp->conns += peers->number;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
312
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
313 lcp->rrp.peers = peers->next;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
314 pc->tries = lcp->rrp.peers->number;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
315
694
88a1b4797f2e nginx 1.3.10
Igor Sysoev <http://sysoev.ru>
parents: 682
diff changeset
316 n = (lcp->rrp.peers->number + (8 * sizeof(uintptr_t) - 1))
88a1b4797f2e nginx 1.3.10
Igor Sysoev <http://sysoev.ru>
parents: 682
diff changeset
317 / (8 * sizeof(uintptr_t));
88a1b4797f2e nginx 1.3.10
Igor Sysoev <http://sysoev.ru>
parents: 682
diff changeset
318
676
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
319 for (i = 0; i < n; i++) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
320 lcp->rrp.tried[i] = 0;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
321 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
322
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
323 rc = ngx_http_upstream_get_least_conn_peer(pc, lcp);
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
324
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
325 if (rc != NGX_BUSY) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
326 return rc;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
327 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
328 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
329
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
330 /* all peers failed, mark them as live for quick recovery */
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
331
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
332 for (i = 0; i < peers->number; i++) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
333 peers->peer[i].fails = 0;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
334 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
335
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
336 pc->name = peers->name;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
337
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
338 return NGX_BUSY;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
339 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
340
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
341
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
342 static void
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
343 ngx_http_upstream_free_least_conn_peer(ngx_peer_connection_t *pc,
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
344 void *data, ngx_uint_t state)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
345 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
346 ngx_http_upstream_lc_peer_data_t *lcp = data;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
347
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
348 ngx_log_debug2(NGX_LOG_DEBUG_HTTP, pc->log, 0,
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
349 "free least conn peer %ui %ui", pc->tries, state);
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
350
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
351 if (lcp->rrp.peers->single) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
352 lcp->free_rr_peer(pc, &lcp->rrp, state);
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
353 return;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
354 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
355
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
356 if (state == 0 && pc->tries == 0) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
357 return;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
358 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
359
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
360 lcp->conns[lcp->rrp.current]--;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
361
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
362 lcp->free_rr_peer(pc, &lcp->rrp, state);
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
363 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
364
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
365
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
366 static void *
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
367 ngx_http_upstream_least_conn_create_conf(ngx_conf_t *cf)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
368 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
369 ngx_http_upstream_least_conn_conf_t *conf;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
370
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
371 conf = ngx_pcalloc(cf->pool,
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
372 sizeof(ngx_http_upstream_least_conn_conf_t));
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
373 if (conf == NULL) {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
374 return NULL;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
375 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
376
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
377 /*
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
378 * set by ngx_pcalloc():
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
379 *
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
380 * conf->conns = NULL;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
381 */
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
382
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
383 return conf;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
384 }
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
385
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
386
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
387 static char *
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
388 ngx_http_upstream_least_conn(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
389 {
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
390 ngx_http_upstream_srv_conf_t *uscf;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
391
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
392 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
393
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
394 uscf->peer.init_upstream = ngx_http_upstream_init_least_conn;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
395
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
396 uscf->flags = NGX_HTTP_UPSTREAM_CREATE
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
397 |NGX_HTTP_UPSTREAM_WEIGHT
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
398 |NGX_HTTP_UPSTREAM_MAX_FAILS
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
399 |NGX_HTTP_UPSTREAM_FAIL_TIMEOUT
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
400 |NGX_HTTP_UPSTREAM_DOWN
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
401 |NGX_HTTP_UPSTREAM_BACKUP;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
402
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
403 return NGX_CONF_OK;
bfa81a0490a2 nginx 1.3.1
Igor Sysoev <http://sysoev.ru>
parents:
diff changeset
404 }