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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_msec_t delay;
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14 } ngx_http_delay_conf_t;
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15
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16
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17 static void ngx_http_delay_event_handler(ngx_http_request_t *r);
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18
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19
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20 static void *ngx_http_delay_create_conf(ngx_conf_t *cf);
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21 static char *ngx_http_delay_merge_conf(ngx_conf_t *cf, void *parent,
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22 void *child);
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23 static ngx_int_t ngx_http_delay_init(ngx_conf_t *cf);
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24
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25
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26 static ngx_command_t ngx_http_delay_commands[] = {
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27
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28 { ngx_string("delay"),
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29 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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30 ngx_conf_set_msec_slot,
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31 NGX_HTTP_LOC_CONF_OFFSET,
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32 offsetof(ngx_http_delay_conf_t, delay),
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33 NULL },
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34
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35 ngx_null_command
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36 };
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37
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38
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39 static ngx_http_module_t ngx_http_delay_module_ctx = {
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40 NULL, /* preconfiguration */
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41 ngx_http_delay_init, /* postconfiguration */
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42
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43 NULL, /* create main configuration */
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44 NULL, /* init main configuration */
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45
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46 NULL, /* create server configuration */
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47 NULL, /* merge server configuration */
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48
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49 ngx_http_delay_create_conf, /* create location configration */
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50 ngx_http_delay_merge_conf /* merge location configration */
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51 };
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52
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53
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54 ngx_module_t ngx_http_delay_module = {
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55 NGX_MODULE_V1,
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56 &ngx_http_delay_module_ctx, /* module context */
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57 ngx_http_delay_commands, /* module directives */
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58 NGX_HTTP_MODULE, /* module type */
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59 NULL, /* init master */
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60 NULL, /* init module */
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61 NULL, /* init process */
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62 NULL, /* init thread */
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63 NULL, /* exit thread */
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64 NULL, /* exit process */
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65 NULL, /* exit master */
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66 NGX_MODULE_V1_PADDING
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67 };
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68
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69
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70 static ngx_int_t
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71 ngx_http_delay_handler(ngx_http_request_t *r)
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72 {
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73 ngx_http_delay_conf_t *dcf;
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74
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75 if (ngx_http_get_module_ctx(r, ngx_http_delay_module) != NULL) {
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76 return NGX_DECLINED;
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77 }
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78
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79 dcf = ngx_http_get_module_loc_conf(r, ngx_http_delay_module);
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80
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81 if (dcf->delay == NGX_CONF_UNSET_MSEC) {
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82 return NGX_DECLINED;
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83 }
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84
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85 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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86 "delaying request");
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87
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88 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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89 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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90 }
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91
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92 r->read_event_handler = ngx_http_test_reading;
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93 r->write_event_handler = ngx_http_delay_event_handler;
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94
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95 ngx_add_timer(r->connection->write, dcf->delay);
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96
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97 ngx_http_set_ctx(r, (void *) 1, ngx_http_delay_module);
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98
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99 return NGX_AGAIN;
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100 }
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101
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102
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103 static void
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104 ngx_http_delay_event_handler(ngx_http_request_t *r)
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105 {
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106 ngx_event_t *wev;
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107
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108 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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109 "delay");
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110
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111 wev = r->connection->write;
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112
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113 if (!wev->timedout) {
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114
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115 if (ngx_handle_write_event(wev, 0) != NGX_OK) {
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116 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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117 }
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118
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119 return;
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120 }
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121
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122 wev->timedout = 0;
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123
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124 if (ngx_handle_read_event(r->connection->read, 0) != NGX_OK) {
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125 ngx_http_finalize_request(r, NGX_HTTP_INTERNAL_SERVER_ERROR);
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126 return;
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127 }
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128
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129 r->read_event_handler = ngx_http_block_reading;
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130 r->write_event_handler = ngx_http_core_run_phases;
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131
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132 ngx_http_core_run_phases(r);
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133 }
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134
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135
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136 static void *
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137 ngx_http_delay_create_conf(ngx_conf_t *cf)
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138 {
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139 ngx_http_delay_conf_t *conf;
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140
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141 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_delay_conf_t));
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142 if (conf == NULL) {
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143 return NULL;
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144 }
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145
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146 /*
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147 * set by ngx_pcalloc():
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148 *
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149 */
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150
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151 conf->delay = NGX_CONF_UNSET_MSEC;
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152
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153 return conf;
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154 }
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155
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156
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157 static char *
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158 ngx_http_delay_merge_conf(ngx_conf_t *cf, void *parent, void *child)
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159 {
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160 ngx_http_delay_conf_t *prev = parent;
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161 ngx_http_delay_conf_t *conf = child;
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162
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163 ngx_conf_merge_msec_value(conf->delay, prev->delay,
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164 NGX_CONF_UNSET_MSEC);
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165
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166 return NGX_CONF_OK;
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167 }
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168
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169
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170 static ngx_int_t
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171 ngx_http_delay_init(ngx_conf_t *cf)
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172 {
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173 ngx_http_handler_pt *h;
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174 ngx_http_core_main_conf_t *cmcf;
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175
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176 cmcf = ngx_http_conf_get_module_main_conf(cf, ngx_http_core_module);
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177
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178 h = ngx_array_push(&cmcf->phases[NGX_HTTP_PREACCESS_PHASE].handlers);
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179 if (h == NULL) {
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180 return NGX_ERROR;
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181 }
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182
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183 *h = ngx_http_delay_handler;
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184
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185 return NGX_OK;
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186 }
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