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640
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1
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2 /*
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3 * Copyright (C) Maxim Dounin
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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_uint_t max_cached;
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14 ngx_uint_t single; /* unsigned:1 */
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15
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16 ngx_queue_t cache;
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17 ngx_queue_t free;
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18
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19 ngx_http_upstream_init_pt original_init_upstream;
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20 ngx_http_upstream_init_peer_pt original_init_peer;
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21
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22 } ngx_http_upstream_keepalive_srv_conf_t;
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23
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24
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25 typedef struct {
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26 ngx_http_upstream_keepalive_srv_conf_t *conf;
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27
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28 ngx_http_upstream_t *upstream;
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29
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30 void *data;
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31
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32 ngx_event_get_peer_pt original_get_peer;
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33 ngx_event_free_peer_pt original_free_peer;
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34
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35 #if (NGX_HTTP_SSL)
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36 ngx_event_set_peer_session_pt original_set_session;
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37 ngx_event_save_peer_session_pt original_save_session;
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38 #endif
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39
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40 ngx_uint_t failed; /* unsigned:1 */
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41
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42 } ngx_http_upstream_keepalive_peer_data_t;
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43
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44
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45 typedef struct {
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46 ngx_http_upstream_keepalive_srv_conf_t *conf;
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47
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48 ngx_queue_t queue;
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49 ngx_connection_t *connection;
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50
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51 socklen_t socklen;
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52 u_char sockaddr[NGX_SOCKADDRLEN];
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53
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54 } ngx_http_upstream_keepalive_cache_t;
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55
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56
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57 static ngx_int_t ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r,
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58 ngx_http_upstream_srv_conf_t *us);
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59 static ngx_int_t ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc,
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60 void *data);
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61 static void ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc,
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62 void *data, ngx_uint_t state);
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63
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64 static void ngx_http_upstream_keepalive_dummy_handler(ngx_event_t *ev);
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65 static void ngx_http_upstream_keepalive_close_handler(ngx_event_t *ev);
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66 static void ngx_http_upstream_keepalive_close(ngx_connection_t *c);
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67
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68
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69 #if (NGX_HTTP_SSL)
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70 static ngx_int_t ngx_http_upstream_keepalive_set_session(
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71 ngx_peer_connection_t *pc, void *data);
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72 static void ngx_http_upstream_keepalive_save_session(ngx_peer_connection_t *pc,
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73 void *data);
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74 #endif
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75
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76 static void *ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf);
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77 static char *ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd,
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78 void *conf);
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79
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80
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81 static ngx_command_t ngx_http_upstream_keepalive_commands[] = {
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82
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83 { ngx_string("keepalive"),
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84 NGX_HTTP_UPS_CONF|NGX_CONF_TAKE12,
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85 ngx_http_upstream_keepalive,
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86 0,
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87 0,
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88 NULL },
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89
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90 ngx_null_command
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91 };
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92
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93
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94 static ngx_http_module_t ngx_http_upstream_keepalive_module_ctx = {
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95 NULL, /* preconfiguration */
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96 NULL, /* postconfiguration */
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97
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98 NULL, /* create main configuration */
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99 NULL, /* init main configuration */
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100
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101 ngx_http_upstream_keepalive_create_conf, /* create server configuration */
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102 NULL, /* merge server configuration */
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103
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104 NULL, /* create location configuration */
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105 NULL /* merge location configuration */
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106 };
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107
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108
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109 ngx_module_t ngx_http_upstream_keepalive_module = {
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110 NGX_MODULE_V1,
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111 &ngx_http_upstream_keepalive_module_ctx, /* module context */
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112 ngx_http_upstream_keepalive_commands, /* module directives */
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113 NGX_HTTP_MODULE, /* module type */
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114 NULL, /* init master */
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115 NULL, /* init module */
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116 NULL, /* init process */
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117 NULL, /* init thread */
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118 NULL, /* exit thread */
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119 NULL, /* exit process */
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120 NULL, /* exit master */
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121 NGX_MODULE_V1_PADDING
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122 };
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123
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124
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125 static ngx_int_t
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126 ngx_http_upstream_init_keepalive(ngx_conf_t *cf,
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127 ngx_http_upstream_srv_conf_t *us)
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128 {
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129 ngx_uint_t i;
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130 ngx_http_upstream_keepalive_srv_conf_t *kcf;
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131 ngx_http_upstream_keepalive_cache_t *cached;
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132
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133 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, cf->log, 0,
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134 "init keepalive");
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135
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136 kcf = ngx_http_conf_upstream_srv_conf(us,
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137 ngx_http_upstream_keepalive_module);
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138
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139 if (kcf->original_init_upstream(cf, us) != NGX_OK) {
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140 return NGX_ERROR;
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141 }
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142
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143 kcf->original_init_peer = us->peer.init;
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144
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145 us->peer.init = ngx_http_upstream_init_keepalive_peer;
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146
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147 /* allocate cache items and add to free queue */
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148
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149 cached = ngx_pcalloc(cf->pool,
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150 sizeof(ngx_http_upstream_keepalive_cache_t) * kcf->max_cached);
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151 if (cached == NULL) {
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152 return NGX_ERROR;
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153 }
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154
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155 ngx_queue_init(&kcf->cache);
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156 ngx_queue_init(&kcf->free);
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157
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158 for (i = 0; i < kcf->max_cached; i++) {
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159 ngx_queue_insert_head(&kcf->free, &cached[i].queue);
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160 cached[i].conf = kcf;
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161 }
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162
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163 return NGX_OK;
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164 }
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165
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166
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167 static ngx_int_t
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168 ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r,
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169 ngx_http_upstream_srv_conf_t *us)
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170 {
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171 ngx_http_upstream_keepalive_peer_data_t *kp;
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172 ngx_http_upstream_keepalive_srv_conf_t *kcf;
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173
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174 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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175 "init keepalive peer");
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176
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177 kcf = ngx_http_conf_upstream_srv_conf(us,
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178 ngx_http_upstream_keepalive_module);
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179
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180 kp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_keepalive_peer_data_t));
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181 if (kp == NULL) {
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182 return NGX_ERROR;
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183 }
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184
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185 if (kcf->original_init_peer(r, us) != NGX_OK) {
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186 return NGX_ERROR;
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187 }
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188
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189 kp->conf = kcf;
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190 kp->upstream = r->upstream;
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191 kp->data = r->upstream->peer.data;
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192 kp->original_get_peer = r->upstream->peer.get;
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193 kp->original_free_peer = r->upstream->peer.free;
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194
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195 r->upstream->peer.data = kp;
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196 r->upstream->peer.get = ngx_http_upstream_get_keepalive_peer;
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197 r->upstream->peer.free = ngx_http_upstream_free_keepalive_peer;
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198
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199 #if (NGX_HTTP_SSL)
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200 kp->original_set_session = r->upstream->peer.set_session;
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201 kp->original_save_session = r->upstream->peer.save_session;
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202 r->upstream->peer.set_session = ngx_http_upstream_keepalive_set_session;
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203 r->upstream->peer.save_session = ngx_http_upstream_keepalive_save_session;
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204 #endif
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205
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206 return NGX_OK;
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207 }
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208
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209
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210 static ngx_int_t
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211 ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc, void *data)
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212 {
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213 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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214 ngx_http_upstream_keepalive_cache_t *item;
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215
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216 ngx_int_t rc;
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217 ngx_queue_t *q, *cache;
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218 ngx_connection_t *c;
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219
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220 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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221 "get keepalive peer");
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222
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223 kp->failed = 0;
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224
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225 /* single pool of cached connections */
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226
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227 if (kp->conf->single && !ngx_queue_empty(&kp->conf->cache)) {
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228
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229 q = ngx_queue_head(&kp->conf->cache);
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230
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231 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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232 c = item->connection;
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233
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234 ngx_queue_remove(q);
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235 ngx_queue_insert_head(&kp->conf->free, q);
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236
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237 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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238 "get keepalive peer: using connection %p", c);
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239
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240 c->idle = 0;
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241 c->log = pc->log;
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242 c->read->log = pc->log;
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243 c->write->log = pc->log;
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244 c->pool->log = pc->log;
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245
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246 pc->connection = c;
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247 pc->cached = 1;
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248
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249 return NGX_DONE;
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250 }
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251
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252 rc = kp->original_get_peer(pc, kp->data);
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253
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254 if (kp->conf->single || rc != NGX_OK) {
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255 return rc;
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256 }
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257
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258 /* search cache for suitable connection */
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259
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260 cache = &kp->conf->cache;
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261
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262 for (q = ngx_queue_head(cache);
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263 q != ngx_queue_sentinel(cache);
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264 q = ngx_queue_next(q))
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265 {
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266 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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267 c = item->connection;
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268
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269 if (ngx_memn2cmp((u_char *) &item->sockaddr, (u_char *) pc->sockaddr,
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270 item->socklen, pc->socklen)
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271 == 0)
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272 {
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273 ngx_queue_remove(q);
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274 ngx_queue_insert_head(&kp->conf->free, q);
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275
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276 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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277 "get keepalive peer: using connection %p", c);
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278
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279 c->idle = 0;
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280 c->log = pc->log;
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281 c->read->log = pc->log;
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282 c->write->log = pc->log;
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283 c->pool->log = pc->log;
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284
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285 pc->connection = c;
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286 pc->cached = 1;
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287
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288 return NGX_DONE;
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289 }
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290 }
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291
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292 return NGX_OK;
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293 }
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294
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295
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296 static void
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297 ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc, void *data,
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298 ngx_uint_t state)
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299 {
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300 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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301 ngx_http_upstream_keepalive_cache_t *item;
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302
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303 ngx_queue_t *q;
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304 ngx_connection_t *c;
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305 ngx_http_upstream_t *u;
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306
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307 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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308 "free keepalive peer");
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309
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310 /* remember failed state - peer.free() may be called more than once */
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311
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312 if (state & NGX_PEER_FAILED) {
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313 kp->failed = 1;
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314 }
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315
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316 /* cache valid connections */
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317
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318 u = kp->upstream;
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319 c = pc->connection;
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320
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321 if (kp->failed
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322 || c == NULL
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323 || c->read->eof
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324 || c->read->error
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325 || c->read->timedout
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326 || c->write->error
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327 || c->write->timedout)
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328 {
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329 goto invalid;
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330 }
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331
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332 if (!u->keepalive) {
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333 goto invalid;
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334 }
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335
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336 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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337 goto invalid;
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338 }
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339
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340 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, pc->log, 0,
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341 "free keepalive peer: saving connection %p", c);
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342
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343 if (ngx_queue_empty(&kp->conf->free)) {
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344
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345 q = ngx_queue_last(&kp->conf->cache);
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346 ngx_queue_remove(q);
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347
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348 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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349
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350 ngx_http_upstream_keepalive_close(item->connection);
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351
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352 } else {
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353 q = ngx_queue_head(&kp->conf->free);
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354 ngx_queue_remove(q);
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355
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356 item = ngx_queue_data(q, ngx_http_upstream_keepalive_cache_t, queue);
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357 }
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358
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359 item->connection = c;
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360 ngx_queue_insert_head(&kp->conf->cache, q);
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361
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362 pc->connection = NULL;
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363
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364 if (c->read->timer_set) {
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365 ngx_del_timer(c->read);
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366 }
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367 if (c->write->timer_set) {
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368 ngx_del_timer(c->write);
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369 }
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370
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371 c->write->handler = ngx_http_upstream_keepalive_dummy_handler;
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372 c->read->handler = ngx_http_upstream_keepalive_close_handler;
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373
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374 c->data = item;
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375 c->idle = 1;
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376 c->log = ngx_cycle->log;
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377 c->read->log = ngx_cycle->log;
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378 c->write->log = ngx_cycle->log;
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379 c->pool->log = ngx_cycle->log;
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380
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381 item->socklen = pc->socklen;
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382 ngx_memcpy(&item->sockaddr, pc->sockaddr, pc->socklen);
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383
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384 if (c->read->ready) {
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385 ngx_http_upstream_keepalive_close_handler(c->read);
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386 }
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387
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388 invalid:
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389
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390 kp->original_free_peer(pc, kp->data, state);
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391 }
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392
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393
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394 static void
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395 ngx_http_upstream_keepalive_dummy_handler(ngx_event_t *ev)
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396 {
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397 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0,
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398 "keepalive dummy handler");
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399 }
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400
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401
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402 static void
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403 ngx_http_upstream_keepalive_close_handler(ngx_event_t *ev)
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404 {
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405 ngx_http_upstream_keepalive_srv_conf_t *conf;
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406 ngx_http_upstream_keepalive_cache_t *item;
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407
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408 int n;
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409 char buf[1];
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410 ngx_connection_t *c;
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411
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412 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, ev->log, 0,
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413 "keepalive close handler");
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414
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415 c = ev->data;
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416
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417 if (c->close) {
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418 goto close;
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419 }
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420
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421 n = recv(c->fd, buf, 1, MSG_PEEK);
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422
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423 if (n == -1 && ngx_socket_errno == NGX_EAGAIN) {
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424 /* stale event */
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425
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426 if (ngx_handle_read_event(c->read, 0) != NGX_OK) {
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427 goto close;
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428 }
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429
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430 return;
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431 }
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432
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433 close:
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434
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435 item = c->data;
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436 conf = item->conf;
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437
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438 ngx_http_upstream_keepalive_close(c);
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439
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440 ngx_queue_remove(&item->queue);
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441 ngx_queue_insert_head(&conf->free, &item->queue);
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442 }
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443
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444
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445 static void
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446 ngx_http_upstream_keepalive_close(ngx_connection_t *c)
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447 {
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448
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449 #if (NGX_HTTP_SSL)
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450
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451 if (c->ssl) {
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452 c->ssl->no_wait_shutdown = 1;
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453 c->ssl->no_send_shutdown = 1;
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454
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455 if (ngx_ssl_shutdown(c) == NGX_AGAIN) {
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456 c->ssl->handler = ngx_http_upstream_keepalive_close;
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457 return;
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458 }
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459 }
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460
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461 #endif
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462
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463 ngx_destroy_pool(c->pool);
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464 ngx_close_connection(c);
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465 }
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466
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467
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468 #if (NGX_HTTP_SSL)
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469
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470 static ngx_int_t
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471 ngx_http_upstream_keepalive_set_session(ngx_peer_connection_t *pc, void *data)
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472 {
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473 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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474
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475 return kp->original_set_session(pc, kp->data);
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476 }
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477
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478
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479 static void
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480 ngx_http_upstream_keepalive_save_session(ngx_peer_connection_t *pc, void *data)
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|
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481 {
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482 ngx_http_upstream_keepalive_peer_data_t *kp = data;
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|
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483
|
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484 kp->original_save_session(pc, kp->data);
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485 return;
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486 }
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487
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|
|
488 #endif
|
|
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489
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|
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490
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|
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491 static void *
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|
|
492 ngx_http_upstream_keepalive_create_conf(ngx_conf_t *cf)
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|
|
493 {
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|
|
494 ngx_http_upstream_keepalive_srv_conf_t *conf;
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|
|
495
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|
|
496 conf = ngx_pcalloc(cf->pool,
|
|
|
497 sizeof(ngx_http_upstream_keepalive_srv_conf_t));
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|
|
498 if (conf == NULL) {
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|
|
499 return NULL;
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|
|
500 }
|
|
|
501
|
|
|
502 /*
|
|
|
503 * set by ngx_pcalloc():
|
|
|
504 *
|
|
|
505 * conf->original_init_upstream = NULL;
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|
|
506 * conf->original_init_peer = NULL;
|
|
|
507 */
|
|
|
508
|
|
|
509 conf->max_cached = 1;
|
|
|
510
|
|
|
511 return conf;
|
|
|
512 }
|
|
|
513
|
|
|
514
|
|
|
515 static char *
|
|
|
516 ngx_http_upstream_keepalive(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
|
517 {
|
|
|
518 ngx_http_upstream_srv_conf_t *uscf;
|
|
|
519 ngx_http_upstream_keepalive_srv_conf_t *kcf;
|
|
|
520
|
|
|
521 ngx_int_t n;
|
|
|
522 ngx_str_t *value;
|
|
|
523 ngx_uint_t i;
|
|
|
524
|
|
|
525 uscf = ngx_http_conf_get_module_srv_conf(cf, ngx_http_upstream_module);
|
|
|
526
|
|
|
527 kcf = ngx_http_conf_upstream_srv_conf(uscf,
|
|
|
528 ngx_http_upstream_keepalive_module);
|
|
|
529
|
|
|
530 kcf->original_init_upstream = uscf->peer.init_upstream
|
|
|
531 ? uscf->peer.init_upstream
|
|
|
532 : ngx_http_upstream_init_round_robin;
|
|
|
533
|
|
|
534 uscf->peer.init_upstream = ngx_http_upstream_init_keepalive;
|
|
|
535
|
|
|
536 /* read options */
|
|
|
537
|
|
|
538 value = cf->args->elts;
|
|
|
539
|
|
|
540 n = ngx_atoi(value[1].data, value[1].len);
|
|
|
541
|
|
|
542 if (n == NGX_ERROR || n == 0) {
|
|
|
543 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
544 "invalid value \"%V\" in \"%V\" directive",
|
|
|
545 &value[1], &cmd->name);
|
|
|
546 return NGX_CONF_ERROR;
|
|
|
547 }
|
|
|
548
|
|
|
549 kcf->max_cached = n;
|
|
|
550
|
|
|
551 for (i = 2; i < cf->args->nelts; i++) {
|
|
|
552
|
|
|
553 if (ngx_strcmp(value[i].data, "single") == 0) {
|
|
|
554 kcf->single = 1;
|
|
|
555 continue;
|
|
|
556 }
|
|
|
557
|
|
|
558 goto invalid;
|
|
|
559 }
|
|
|
560
|
|
|
561 return NGX_CONF_OK;
|
|
|
562
|
|
|
563 invalid:
|
|
|
564
|
|
|
565 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
|
|
|
566 "invalid parameter \"%V\"", &value[i]);
|
|
|
567
|
|
|
568 return NGX_CONF_ERROR;
|
|
|
569 }
|
