6612
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1
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2 /*
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3 * Copyright (C) Roman Arutyunyan
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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_stream.h>
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11
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12
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13 typedef struct {
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14 ngx_stream_complex_value_t text;
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15 } ngx_stream_return_srv_conf_t;
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16
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17
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18 typedef struct {
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19 ngx_buf_t buf;
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20 } ngx_stream_return_ctx_t;
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21
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22
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23 static void ngx_stream_return_handler(ngx_stream_session_t *s);
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24 static void ngx_stream_return_write_handler(ngx_event_t *ev);
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25
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26 static void *ngx_stream_return_create_srv_conf(ngx_conf_t *cf);
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27 static char *ngx_stream_return(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
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28
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29
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30 static ngx_command_t ngx_stream_return_commands[] = {
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31
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32 { ngx_string("return"),
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33 NGX_STREAM_SRV_CONF|NGX_CONF_TAKE1,
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34 ngx_stream_return,
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35 NGX_STREAM_SRV_CONF_OFFSET,
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36 0,
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37 NULL },
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38
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39 ngx_null_command
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40 };
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41
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42
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43 static ngx_stream_module_t ngx_stream_return_module_ctx = {
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44 NULL, /* preconfiguration */
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45 NULL, /* postconfiguration */
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46
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47 NULL, /* create main configuration */
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48 NULL, /* init main configuration */
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49
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50 ngx_stream_return_create_srv_conf, /* create server configuration */
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51 NULL /* merge server configuration */
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52 };
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53
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54
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55 ngx_module_t ngx_stream_return_module = {
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56 NGX_MODULE_V1,
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57 &ngx_stream_return_module_ctx, /* module context */
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58 ngx_stream_return_commands, /* module directives */
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59 NGX_STREAM_MODULE, /* module type */
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60 NULL, /* init master */
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61 NULL, /* init module */
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62 NULL, /* init process */
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63 NULL, /* init thread */
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64 NULL, /* exit thread */
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65 NULL, /* exit process */
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66 NULL, /* exit master */
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67 NGX_MODULE_V1_PADDING
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68 };
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69
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70
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71 static void
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72 ngx_stream_return_handler(ngx_stream_session_t *s)
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73 {
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74 ngx_str_t text;
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75 ngx_connection_t *c;
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76 ngx_stream_return_ctx_t *ctx;
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77 ngx_stream_return_srv_conf_t *rscf;
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78
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79 c = s->connection;
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80
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81 c->log->action = "returning text";
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82
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83 rscf = ngx_stream_get_module_srv_conf(s, ngx_stream_return_module);
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84
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85 if (ngx_stream_complex_value(s, &rscf->text, &text) != NGX_OK) {
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86 ngx_stream_close_connection(c);
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87 return;
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88 }
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89
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90 ngx_log_debug1(NGX_LOG_DEBUG_STREAM, c->log, 0,
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91 "stream return text: \"%V\"", &text);
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92
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93 if (text.len == 0) {
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94 ngx_stream_close_connection(c);
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95 return;
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96 }
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97
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98 ctx = ngx_pcalloc(c->pool, sizeof(ngx_stream_return_ctx_t));
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99 if (ctx == NULL) {
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100 ngx_stream_close_connection(c);
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101 return;
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102 }
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103
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104 ngx_stream_set_ctx(s, ctx, ngx_stream_return_module);
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105
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106 ctx->buf.pos = text.data;
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107 ctx->buf.last = text.data + text.len;
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108
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109 c->write->handler = ngx_stream_return_write_handler;
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110
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111 ngx_stream_return_write_handler(c->write);
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112 }
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113
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114
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115 static void
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116 ngx_stream_return_write_handler(ngx_event_t *ev)
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117 {
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118 ssize_t n;
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119 ngx_buf_t *b;
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120 ngx_connection_t *c;
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121 ngx_stream_session_t *s;
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122 ngx_stream_return_ctx_t *ctx;
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123
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124 c = ev->data;
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125 s = c->data;
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126
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127 if (ev->timedout) {
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128 ngx_connection_error(c, NGX_ETIMEDOUT, "connection timed out");
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129 ngx_stream_close_connection(c);
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130 return;
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131 }
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132
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133 if (ev->ready) {
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134 ctx = ngx_stream_get_module_ctx(s, ngx_stream_return_module);
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135
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136 b = &ctx->buf;
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137
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138 n = c->send(c, b->pos, b->last - b->pos);
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139 if (n == NGX_ERROR) {
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140 ngx_stream_close_connection(c);
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141 return;
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142 }
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143
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144 if (n > 0) {
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145 b->pos += n;
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146
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147 if (b->pos == b->last) {
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148 ngx_stream_close_connection(c);
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149 return;
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150 }
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151 }
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152 }
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153
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154 if (ngx_handle_write_event(ev, 0) != NGX_OK) {
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155 ngx_stream_close_connection(c);
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156 return;
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157 }
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158
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159 ngx_add_timer(ev, 5000);
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160 }
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161
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162
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163 static void *
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164 ngx_stream_return_create_srv_conf(ngx_conf_t *cf)
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165 {
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166 ngx_stream_return_srv_conf_t *conf;
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167
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168 conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_return_srv_conf_t));
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169 if (conf == NULL) {
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170 return NULL;
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171 }
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172
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173 return conf;
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174 }
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175
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176
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177 static char *
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178 ngx_stream_return(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
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179 {
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180 ngx_stream_return_srv_conf_t *rscf = conf;
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181
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182 ngx_str_t *value;
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183 ngx_stream_core_srv_conf_t *cscf;
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184 ngx_stream_compile_complex_value_t ccv;
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185
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186 if (rscf->text.value.data) {
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187 return "is duplicate";
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188 }
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189
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190 value = cf->args->elts;
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191
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192 ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t));
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193
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194 ccv.cf = cf;
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195 ccv.value = &value[1];
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196 ccv.complex_value = &rscf->text;
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197
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198 if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) {
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199 return NGX_CONF_ERROR;
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200 }
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201
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202 cscf = ngx_stream_conf_get_module_srv_conf(cf, ngx_stream_core_module);
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203
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204 cscf->handler = ngx_stream_return_handler;
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205
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206 return NGX_CONF_OK;
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207 }
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