Mercurial > hg > ngx_http_upstream_keepalive
annotate ngx_http_upstream_keepalive_module.c @ 0:725ee11164f3
Keepalive upstream balancer: transparent skeleton.
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 20 Oct 2008 18:00:33 +0400 |
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children | ca955a7f651b |
rev | line source |
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0
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Keepalive upstream balancer: transparent skeleton.
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
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4 */ |
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5 |
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6 |
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7 #include <ngx_config.h> |
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8 #include <ngx_core.h> |
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9 #include <ngx_http.h> |
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10 |
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11 |
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12 typedef struct { |
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13 ngx_int_t cached; |
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14 |
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15 ngx_http_upstream_init_pt original_init_upstream; |
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16 ngx_http_upstream_init_peer_pt original_init_peer; |
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17 |
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18 } ngx_http_upstream_keepalive_srv_conf_t; |
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19 |
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20 typedef struct { |
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21 void *data; |
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22 |
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23 ngx_event_get_peer_pt original_get_peer; |
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24 ngx_event_free_peer_pt original_free_peer; |
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25 |
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26 } ngx_http_upstream_keepalive_peer_data_t; |
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27 |
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28 |
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29 static ngx_int_t ngx_http_upstream_init_keepalive_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_keepalive_peer(ngx_peer_connection_t *pc, |
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32 void *data); |
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33 static void ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc, |
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34 void *data, ngx_uint_t state); |
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35 |
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36 static void *ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf); |
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37 static char *ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd, |
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38 void *conf); |
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39 |
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40 |
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41 static ngx_command_t ngx_http_upstream_keepalive_commands[] = { |
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42 |
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43 { ngx_string("keepalive"), |
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44 NGX_HTTP_UPS_CONF|NGX_CONF_NOARGS, |
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45 ngx_http_upstream_keepalive, |
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46 0, |
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47 0, |
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48 NULL }, |
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49 |
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50 ngx_null_command |
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51 }; |
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52 |
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53 |
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54 static ngx_http_module_t ngx_http_upstream_keepalive_module_ctx = { |
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55 NULL, /* preconfiguration */ |
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56 NULL, /* postconfiguration */ |
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57 |
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58 NULL, /* create main configuration */ |
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59 NULL, /* init main configuration */ |
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60 |
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61 ngx_http_upstream_keepalive_create_conf, /* create server configuration */ |
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62 NULL, /* merge server configuration */ |
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63 |
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64 NULL, /* create location configuration */ |
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65 NULL /* merge location configuration */ |
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66 }; |
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67 |
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68 |
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69 ngx_module_t ngx_http_upstream_keepalive_module = { |
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70 NGX_MODULE_V1, |
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71 &ngx_http_upstream_keepalive_module_ctx, /* module context */ |
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72 ngx_http_upstream_keepalive_commands, /* module directives */ |
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73 NGX_HTTP_MODULE, /* module type */ |
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74 NULL, /* init master */ |
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75 NULL, /* init module */ |
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76 NULL, /* init process */ |
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77 NULL, /* init thread */ |
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78 NULL, /* exit thread */ |
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79 NULL, /* exit process */ |
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80 NULL, /* exit master */ |
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81 NGX_MODULE_V1_PADDING |
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82 }; |
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83 |
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84 |
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85 ngx_int_t |
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86 ngx_http_upstream_init_keepalive(ngx_conf_t *cf, |
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87 ngx_http_upstream_srv_conf_t *us) |
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88 { |
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89 ngx_http_upstream_keepalive_srv_conf_t *kcf; |
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90 |
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91 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0, |
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92 "init keepalive"); |
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93 |
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94 kcf = ngx_http_conf_upstream_srv_conf(us, |
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95 ngx_http_upstream_keepalive_module); |
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96 |
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97 if (kcf->original_init_upstream(cf, us) != NGX_OK) { |
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98 return NGX_ERROR; |
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99 } |
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100 |
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101 kcf->original_init_peer = us->peer.init; |
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102 |
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103 us->peer.init = ngx_http_upstream_init_keepalive_peer; |
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104 |
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105 return NGX_OK; |
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106 } |
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107 |
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108 |
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109 static ngx_int_t |
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110 ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r, |
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111 ngx_http_upstream_srv_conf_t *us) |
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112 { |
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113 ngx_http_upstream_keepalive_peer_data_t *kp; |
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114 ngx_http_upstream_keepalive_srv_conf_t *kcf; |
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115 |
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116 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0, |
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117 "init keepalive peer"); |
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118 |
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119 kcf = ngx_http_conf_upstream_srv_conf(us, |
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120 ngx_http_upstream_keepalive_module); |
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121 |
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122 kp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_keepalive_peer_data_t)); |
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123 if (kp == NULL) { |
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124 return NGX_ERROR; |
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125 } |
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126 |
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127 if (kcf->original_init_peer(r, us) != NGX_OK) { |
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128 return NGX_ERROR; |
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129 } |
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130 |
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131 kp->data = r->upstream->peer.data; |
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132 kp->original_get_peer = r->upstream->peer.get; |
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133 kp->original_free_peer = r->upstream->peer.free; |
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134 |
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135 r->upstream->peer.data = kp; |
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136 r->upstream->peer.get = ngx_http_upstream_get_keepalive_peer; |
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137 r->upstream->peer.free = ngx_http_upstream_free_keepalive_peer; |
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138 |
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139 return NGX_OK; |
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140 } |
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141 |
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142 |
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143 static ngx_int_t |
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144 ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc, void *data) |
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145 { |
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146 ngx_http_upstream_keepalive_peer_data_t *kp = data; |
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147 |
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148 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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149 "get keepalive peer"); |
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150 |
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151 return kp->original_get_peer(pc, kp->data); |
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152 } |
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153 |
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154 |
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155 static void |
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156 ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc, void *data, |
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157 ngx_uint_t state) |
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158 { |
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159 ngx_http_upstream_keepalive_peer_data_t *kp = data; |
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160 |
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161 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0, |
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162 "free keepalive peer"); |
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163 |
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164 return kp->original_free_peer(pc, kp->data, state); |
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165 } |
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166 |
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167 |
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168 static void * |
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169 ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf) |
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170 { |
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171 ngx_http_upstream_keepalive_srv_conf_t *conf; |
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172 |
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173 conf = ngx_pcalloc(cf->pool, |
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174 sizeof(ngx_http_upstream_keepalive_srv_conf_t)); |
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175 if (conf == NULL) { |
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176 return NGX_CONF_ERROR; |
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177 } |
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178 |
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179 /* |
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180 * set by ngx_pcalloc(): |
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181 * |
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182 * conf->cached = 0; |
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183 * conf->original_init_upstream = NULL; |
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184 * conf->original_init_peer = NULL; |
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185 */ |
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186 |
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187 return conf; |
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188 } |
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189 |
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190 |
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191 static char * |
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192 ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd, void *conf) |
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193 { |
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194 ngx_http_upstream_srv_conf_t *uscf; |
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195 ngx_http_upstream_keepalive_srv_conf_t *kcf; |
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196 |
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197 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module); |
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198 |
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199 kcf = ngx_http_conf_upstream_srv_conf(uscf, |
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200 ngx_http_upstream_keepalive_module); |
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201 |
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202 kcf->original_init_upstream = uscf->peer.init_upstream |
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203 ? uscf->peer.init_upstream |
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204 : ngx_http_upstream_init_round_robin; |
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205 |
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206 uscf->peer.init_upstream = ngx_http_upstream_init_keepalive; |
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207 |
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208 return NGX_CONF_OK; |
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209 } |