130
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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_event.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_http_upstream_conf_t upstream;
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15 ngx_peers_t *peers;
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16 } ngx_http_memcached_loc_conf_t;
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17
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18
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19 typedef struct {
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20 size_t rest;
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21 ngx_http_request_t *request;
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22 } ngx_http_memcached_ctx_t;
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23
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24
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25 static ngx_int_t ngx_http_memcached_create_request(ngx_http_request_t *r);
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26 static ngx_int_t ngx_http_memcached_reinit_request(ngx_http_request_t *r);
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27 static ngx_int_t ngx_http_memcached_process_header(ngx_http_request_t *r);
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28 static ngx_int_t ngx_http_memcached_filter_init(void *data);
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29 static ngx_int_t ngx_http_memcached_filter(void *data, ssize_t bytes);
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30 static void ngx_http_memcached_abort_request(ngx_http_request_t *r);
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31 static void ngx_http_memcached_finalize_request(ngx_http_request_t *r,
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32 ngx_int_t rc);
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33
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34 static void *ngx_http_memcached_create_loc_conf(ngx_conf_t *cf);
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35 static char *ngx_http_memcached_merge_loc_conf(ngx_conf_t *cf,
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36 void *parent, void *child);
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37
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38 static char *ngx_http_memcached_pass(ngx_conf_t *cf, ngx_command_t *cmd,
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39 void *conf);
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40
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41
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42 static ngx_conf_bitmask_t ngx_http_memcached_next_upstream_masks[] = {
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43 { ngx_string("error"), NGX_HTTP_UPSTREAM_FT_ERROR },
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44 { ngx_string("timeout"), NGX_HTTP_UPSTREAM_FT_TIMEOUT },
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45 { ngx_string("invalid_response"), NGX_HTTP_UPSTREAM_FT_INVALID_HEADER },
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46 { ngx_string("not_found"), NGX_HTTP_UPSTREAM_FT_HTTP_404 },
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47 { ngx_null_string, 0 }
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48 };
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49
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50
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51 static ngx_command_t ngx_http_memcached_commands[] = {
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52
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53 { ngx_string("memcached_pass"),
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54 NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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55 ngx_http_memcached_pass,
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56 NGX_HTTP_LOC_CONF_OFFSET,
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57 0,
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58 NULL },
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59
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60 { ngx_string("memcached_connect_timeout"),
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61 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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62 ngx_conf_set_msec_slot,
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63 NGX_HTTP_LOC_CONF_OFFSET,
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64 offsetof(ngx_http_memcached_loc_conf_t, upstream.connect_timeout),
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65 NULL },
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66
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67 { ngx_string("memcached_send_timeout"),
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68 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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69 ngx_conf_set_msec_slot,
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70 NGX_HTTP_LOC_CONF_OFFSET,
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71 offsetof(ngx_http_memcached_loc_conf_t, upstream.send_timeout),
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72 NULL },
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73
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74 { ngx_string("memcached_buffer_size"),
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75 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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76 ngx_conf_set_size_slot,
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77 NGX_HTTP_LOC_CONF_OFFSET,
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78 offsetof(ngx_http_memcached_loc_conf_t, upstream.buffer_size),
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79 NULL },
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80
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81 { ngx_string("memcached_read_timeout"),
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82 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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83 ngx_conf_set_msec_slot,
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84 NGX_HTTP_LOC_CONF_OFFSET,
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85 offsetof(ngx_http_memcached_loc_conf_t, upstream.read_timeout),
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86 NULL },
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87
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88 { ngx_string("memcached_next_upstream"),
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89 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_1MORE,
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90 ngx_conf_set_bitmask_slot,
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91 NGX_HTTP_LOC_CONF_OFFSET,
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92 offsetof(ngx_http_memcached_loc_conf_t, upstream.next_upstream),
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93 &ngx_http_memcached_next_upstream_masks },
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94
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95 { ngx_string("memcached_upstream_max_fails"),
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96 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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97 ngx_conf_set_num_slot,
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98 NGX_HTTP_LOC_CONF_OFFSET,
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99 offsetof(ngx_http_memcached_loc_conf_t, upstream.max_fails),
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100 NULL },
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101
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102 { ngx_string("memcached_upstream_fail_timeout"),
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103 NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
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104 ngx_conf_set_sec_slot,
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105 NGX_HTTP_LOC_CONF_OFFSET,
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106 offsetof(ngx_http_memcached_loc_conf_t, upstream.fail_timeout),
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107 NULL },
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108
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109 ngx_null_command
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110 };
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111
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112
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113 ngx_http_module_t ngx_http_memcached_module_ctx = {
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114 NULL, /* preconfiguration */
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115 NULL, /* postconfiguration */
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116
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117 NULL, /* create main configuration */
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118 NULL, /* init main configuration */
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119
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120 NULL, /* create server configuration */
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121 NULL, /* merge server configuration */
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122
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123 ngx_http_memcached_create_loc_conf, /* create location configration */
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124 ngx_http_memcached_merge_loc_conf /* merge location configration */
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125 };
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126
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127
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128 ngx_module_t ngx_http_memcached_module = {
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129 NGX_MODULE_V1,
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130 &ngx_http_memcached_module_ctx, /* module context */
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131 ngx_http_memcached_commands, /* module directives */
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132 NGX_HTTP_MODULE, /* module type */
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133 NULL, /* init master */
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134 NULL, /* init module */
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135 NULL, /* init process */
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136 NULL, /* init thread */
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137 NULL, /* exit thread */
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138 NULL, /* exit process */
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139 NULL, /* exit master */
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140 NGX_MODULE_V1_PADDING
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141 };
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142
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143
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144 #define NGX_HTTP_MEMCACHED_END (sizeof(ngx_http_memcached_end) - 1)
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145 static u_char ngx_http_memcached_end[] = CRLF "END" CRLF;
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146
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147
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148 static ngx_int_t
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149 ngx_http_memcached_handler(ngx_http_request_t *r)
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150 {
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151 ngx_int_t rc;
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152 ngx_http_upstream_t *u;
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153 ngx_http_memcached_ctx_t *ctx;
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154 ngx_http_memcached_loc_conf_t *mlcf;
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155
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156 if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
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157 return NGX_HTTP_NOT_ALLOWED;
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158 }
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159
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160 rc = ngx_http_discard_body(r);
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161
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162 if (rc != NGX_OK && rc != NGX_AGAIN) {
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163 return rc;
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164 }
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165
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166 if (ngx_http_set_content_type(r) != NGX_OK) {
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167 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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168 }
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169
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170 mlcf = ngx_http_get_module_loc_conf(r, ngx_http_memcached_module);
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171
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172 u = ngx_pcalloc(r->pool, sizeof(ngx_http_upstream_t));
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173 if (u == NULL) {
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174 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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175 }
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176
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177 u->peer.log = r->connection->log;
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178 u->peer.log_error = NGX_ERROR_ERR;
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179 u->peer.peers = mlcf->peers;
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180 u->peer.tries = mlcf->peers->number;
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181 #if (NGX_THREADS)
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182 u->peer.lock = &r->connection->lock;
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183 #endif
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184
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185 u->output.tag = (ngx_buf_tag_t) &ngx_http_memcached_module;
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186
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187 u->conf = &mlcf->upstream;
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188
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189 u->create_request = ngx_http_memcached_create_request;
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190 u->reinit_request = ngx_http_memcached_reinit_request;
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191 u->process_header = ngx_http_memcached_process_header;
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192 u->abort_request = ngx_http_memcached_abort_request;
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193 u->finalize_request = ngx_http_memcached_finalize_request;
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194
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195 r->upstream = u;
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196
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197 ctx = ngx_palloc(r->pool, sizeof(ngx_http_memcached_ctx_t));
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198 if (ctx == NULL) {
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199 return NGX_HTTP_INTERNAL_SERVER_ERROR;
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200 }
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201
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202 ctx->rest = NGX_HTTP_MEMCACHED_END;
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203 ctx->request = r;
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204
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205 u->input_filter_init = ngx_http_memcached_filter_init;
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206 u->input_filter = ngx_http_memcached_filter;
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207 u->input_filter_ctx = ctx;
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208
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209 ngx_http_upstream_init(r);
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210
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211 return NGX_DONE;
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212 }
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213
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214
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215 static ngx_int_t
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216 ngx_http_memcached_create_request(ngx_http_request_t *r)
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217 {
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218 size_t len;
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219 ngx_buf_t *b;
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220 ngx_chain_t *cl;
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221
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222 len = sizeof("get ") - 1 + r->uri.len + sizeof(" " CRLF) - 1;
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223 if (r->args.len) {
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224 len += 1+ r->args.len;
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225 }
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226
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227 b = ngx_create_temp_buf(r->pool, len);
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228 if (b == NULL) {
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229 return NGX_ERROR;
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230 }
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231
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232 cl = ngx_alloc_chain_link(r->pool);
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233 if (cl == NULL) {
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234 return NGX_ERROR;
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235 }
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236
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237 cl->buf = b;
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238 cl->next = NULL;
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239
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240 r->upstream->request_bufs = cl;
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241
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242 *b->last++ = 'g'; *b->last++ = 'e'; *b->last++ = 't'; *b->last++ = ' ';
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243
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244 b->last = ngx_copy(b->last, r->uri.data, r->uri.len);
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245
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246 if (r->args.len) {
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247 *b->last++ = '?';
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248 b->last = ngx_copy(b->last, r->args.data, r->args.len);
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249 }
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250
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251 #if (NGX_DEBUG)
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252 {
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253 ngx_str_t s;
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254
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255 s.len = b->last - b->pos;
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256 s.data = b->pos;
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257 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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258 "http memcached request: \"%V\"", &s);
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259 }
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260 #endif
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261
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262 *b->last++ = ' '; *b->last++ = CR; *b->last++ = LF;
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263
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264 return NGX_OK;
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265 }
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266
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267
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268 static ngx_int_t
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269 ngx_http_memcached_reinit_request(ngx_http_request_t *r)
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270 {
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271 return NGX_OK;
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272 }
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273
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274
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275 static ngx_int_t
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276 ngx_http_memcached_process_header(ngx_http_request_t *r)
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277 {
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278 u_char *p, *len;
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279 ngx_str_t line;
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280 ngx_http_upstream_t *u;
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281
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282 u = r->upstream;
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283
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284 for (p = u->buffer.pos; p < u->buffer.last; p++) {
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285 if (*p == LF) {
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286 goto found;
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287 }
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288 }
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289
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290 return NGX_AGAIN;
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291
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292 found:
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293
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294 *p = '\0';
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295
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296 line.len = p - u->buffer.pos - 1;
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297 line.data = u->buffer.pos;
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298
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299 ngx_log_debug1(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
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300 "memcached: \"%V\"", &line);
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301
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302 p = u->buffer.pos;
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303
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304 if (ngx_strncmp(p, "VALUE ", sizeof("VALUE ") - 1) == 0) {
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305
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306 p += sizeof("VALUE ") - 1;
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307
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308 if (ngx_strncmp(p, r->uri.data, r->uri.len) != 0) {
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309 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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310 "memcached sent invalid key in response \"%V\" "
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311 "for key \"%V\"",
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312 &line, &r->uri);
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313
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314 return NGX_HTTP_UPSTREAM_INVALID_HEADER;
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315 }
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316
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317 p += r->uri.len;
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318
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319 if (*p++ != ' ') {
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320 goto no_valid;
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321 }
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322
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323 /* skip flags */
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324
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325 while (*p) {
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326 if (*p++ == ' ') {
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327 goto length;
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328 }
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329 }
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330
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331 goto no_valid;
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332
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333 length:
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334
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335 len = p;
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336
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337 while (*p && *p++ != CR) { /* void */ }
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338
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339 r->headers_out.content_length_n = ngx_atoof(len, p - len - 1);
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340 if (r->headers_out.content_length_n == -1) {
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341 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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342 "memcached sent invalid length in response \"%V\" "
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343 "for key \"%V\"",
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344 &line, &r->uri);
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345 return NGX_HTTP_UPSTREAM_INVALID_HEADER;
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346 }
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347
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348 u->headers_in.status_n = 200;
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349 u->buffer.pos = p + 1;
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350
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351 return NGX_OK;
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352 }
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353
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354 if (ngx_strcmp(p, "END\x0d") == 0) {
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355 ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
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356 "key: \"%V\" was not found by memcached", &r->uri);
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357
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358 u->headers_in.status_n = 404;
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359
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360 return NGX_OK;
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361 }
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362
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363 no_valid:
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364
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365 ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
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366 "memcached sent invalid response: \"%V\"", &line);
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367
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368 return NGX_HTTP_UPSTREAM_INVALID_HEADER;
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369 }
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370
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371
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372 static ngx_int_t
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373 ngx_http_memcached_filter_init(void *data)
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374 {
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375 ngx_http_memcached_ctx_t *ctx = data;
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376
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377 ngx_http_upstream_t *u;
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378
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379 u = ctx->request->upstream;
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380
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381 u->length += NGX_HTTP_MEMCACHED_END;
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382
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383 return NGX_OK;
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384 }
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385
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386
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387 static ngx_int_t
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388 ngx_http_memcached_filter(void *data, ssize_t bytes)
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389 {
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390 ngx_http_memcached_ctx_t *ctx = data;
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391
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392 u_char *last;
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393 ngx_buf_t *b;
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394 ngx_chain_t *cl, **ll;
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395 ngx_http_upstream_t *u;
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396
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397 u = ctx->request->upstream;
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398 b = &u->buffer;
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399
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400 if (u->length == ctx->rest) {
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401
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402 if (ngx_strncmp(b->last,
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403 ngx_http_memcached_end + NGX_HTTP_MEMCACHED_END
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404 - ctx->rest,
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405 bytes) != 0)
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406 {
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407 ngx_log_error(NGX_LOG_ERR, ctx->request->connection->log, 0,
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408 "memcached sent invalid trailer");
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409 }
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410
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411 u->length -= bytes;
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412 ctx->rest -= bytes;
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413
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414 return NGX_OK;
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415 }
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416
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417 for (cl = u->out_bufs, ll = &u->out_bufs; cl; cl = cl->next) {
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418 ll = &cl->next;
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419 }
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420
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421 cl = ngx_chain_get_free_buf(ctx->request->pool, &u->free_bufs);
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422 if (cl == NULL) {
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423 return NGX_ERROR;
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424 }
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425
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426 cl->buf->flush = 1;
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427 cl->buf->memory = 1;
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428
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429 *ll = cl;
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430
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431 cl->buf->pos = b->last;
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432 b->last += bytes;
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433 cl->buf->last = b->last;
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434
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435 ngx_log_debug4(NGX_LOG_DEBUG_HTTP, ctx->request->connection->log, 0,
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436 "memcached filter bytes:%z size:%z length:%z rest:%z",
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437 bytes, b->last - b->pos, u->length, ctx->rest);
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438
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439 if (b->last - b->pos <= (ssize_t) (u->length - NGX_HTTP_MEMCACHED_END)) {
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440 u->length -= bytes;
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441 return NGX_OK;
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442 }
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443
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444
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445 last = b->pos + u->length - NGX_HTTP_MEMCACHED_END;
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446
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447 if (ngx_strncmp(last, ngx_http_memcached_end, b->last - last) != 0) {
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448 ngx_log_error(NGX_LOG_ERR, ctx->request->connection->log, 0,
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449 "memcached sent invalid trailer");
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450 }
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451
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452 ctx->rest = u->length - (b->last - b->pos);
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453 b->last = last;
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454 cl->buf->last = last;
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455 u->length = ctx->rest;
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456
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457 return NGX_OK;
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458 }
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459
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460
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461 static void
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462 ngx_http_memcached_abort_request(ngx_http_request_t *r)
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463 {
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464 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
465 "abort http memcached request");
|
|
466 return;
|
|
467 }
|
|
468
|
|
469
|
|
470 static void
|
|
471 ngx_http_memcached_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
|
|
472 {
|
|
473 ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
|
|
474 "finalize http memcached request");
|
|
475 return;
|
|
476 }
|
|
477
|
|
478
|
|
479 static void *
|
|
480 ngx_http_memcached_create_loc_conf(ngx_conf_t *cf)
|
|
481 {
|
|
482 ngx_http_memcached_loc_conf_t *conf;
|
|
483
|
|
484 conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_memcached_loc_conf_t));
|
|
485 if (conf == NULL) {
|
|
486 return NGX_CONF_ERROR;
|
|
487 }
|
|
488
|
|
489 /*
|
|
490 * set by ngx_pcalloc():
|
|
491 *
|
|
492 * conf->upstream.bufs.num = 0;
|
|
493 * conf->upstream.next_upstream = 0;
|
|
494 * conf->upstream.temp_path = NULL;
|
|
495 * conf->upstream.schema = { 0, NULL };
|
|
496 * conf->upstream.uri = { 0, NULL };
|
|
497 * conf->upstream.location = NULL;
|
|
498 *
|
|
499 * conf->peers = NULL;
|
|
500 */
|
|
501
|
|
502 conf->upstream.connect_timeout = NGX_CONF_UNSET_MSEC;
|
|
503 conf->upstream.send_timeout = NGX_CONF_UNSET_MSEC;
|
|
504 conf->upstream.read_timeout = NGX_CONF_UNSET_MSEC;
|
|
505
|
|
506 conf->upstream.buffer_size = NGX_CONF_UNSET_SIZE;
|
|
507
|
|
508 conf->upstream.max_fails = NGX_CONF_UNSET_UINT;
|
|
509 conf->upstream.fail_timeout = NGX_CONF_UNSET;
|
|
510
|
|
511 /* "fastcgi_cyclic_temp_file" is disabled */
|
|
512 conf->upstream.cyclic_temp_file = 0;
|
|
513
|
|
514 /* the hardcoded values */
|
|
515 conf->upstream.send_lowat = 0;
|
|
516 conf->upstream.bufs.num = 0;
|
|
517 conf->upstream.busy_buffers_size = 0;
|
|
518 conf->upstream.max_temp_file_size = 0;
|
|
519 conf->upstream.temp_file_write_size = 0;
|
|
520 conf->upstream.pass_x_powered_by = 0;
|
|
521 conf->upstream.redirect_errors = 1;
|
|
522 conf->upstream.redirect_404 = 1;
|
|
523 conf->upstream.pass_server = 1;
|
|
524 conf->upstream.pass_date = 1;
|
|
525 conf->upstream.pass_request_headers = 0;
|
|
526 conf->upstream.pass_request_body = 0;
|
|
527
|
|
528 return conf;
|
|
529 }
|
|
530
|
|
531
|
|
532 static char *
|
|
533 ngx_http_memcached_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
|
|
534 {
|
|
535 ngx_http_memcached_loc_conf_t *prev = parent;
|
|
536 ngx_http_memcached_loc_conf_t *conf = child;
|
|
537
|
|
538 ngx_uint_t i;
|
|
539
|
|
540 ngx_conf_merge_msec_value(conf->upstream.connect_timeout,
|
|
541 prev->upstream.connect_timeout, 60000);
|
|
542
|
|
543 ngx_conf_merge_msec_value(conf->upstream.send_timeout,
|
|
544 prev->upstream.send_timeout, 60000);
|
|
545
|
|
546 ngx_conf_merge_msec_value(conf->upstream.read_timeout,
|
|
547 prev->upstream.read_timeout, 60000);
|
|
548
|
|
549 ngx_conf_merge_size_value(conf->upstream.buffer_size,
|
|
550 prev->upstream.buffer_size,
|
|
551 (size_t) ngx_pagesize);
|
|
552
|
|
553 ngx_conf_merge_bitmask_value(conf->upstream.next_upstream,
|
|
554 prev->upstream.next_upstream,
|
|
555 (NGX_CONF_BITMASK_SET
|
|
556 |NGX_HTTP_UPSTREAM_FT_ERROR
|
|
557 |NGX_HTTP_UPSTREAM_FT_TIMEOUT));
|
|
558
|
|
559 ngx_conf_merge_unsigned_value(conf->upstream.max_fails,
|
|
560 prev->upstream.max_fails, 1);
|
|
561
|
|
562 ngx_conf_merge_sec_value(conf->upstream.fail_timeout,
|
|
563 prev->upstream.fail_timeout, 10);
|
|
564
|
|
565 if (conf->peers && conf->peers->number > 1) {
|
|
566 for (i = 0; i < conf->peers->number; i++) {
|
|
567 conf->peers->peer[i].weight = 1;
|
|
568 conf->peers->peer[i].max_fails = conf->upstream.max_fails;
|
|
569 conf->peers->peer[i].fail_timeout = conf->upstream.fail_timeout;
|
|
570 }
|
|
571 }
|
|
572
|
|
573 return NGX_CONF_OK;
|
|
574 }
|
|
575
|
|
576
|
|
577 static char *
|
|
578 ngx_http_memcached_pass(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
|
|
579 {
|
|
580 ngx_http_memcached_loc_conf_t *lcf = conf;
|
|
581
|
|
582 ngx_str_t *value;
|
|
583 ngx_inet_upstream_t inet_upstream;
|
|
584 ngx_http_core_loc_conf_t *clcf;
|
|
585
|
|
586 if (lcf->upstream.schema.len) {
|
|
587 return "is duplicate";
|
|
588 }
|
|
589
|
|
590 value = cf->args->elts;
|
|
591
|
|
592 ngx_memzero(&inet_upstream, sizeof(ngx_inet_upstream_t));
|
|
593
|
|
594 inet_upstream.name = value[1];
|
|
595 inet_upstream.url = value[1];
|
|
596
|
|
597 lcf->peers = ngx_inet_upstream_parse(cf, &inet_upstream);
|
|
598 if (lcf->peers == NULL) {
|
|
599 return NGX_CONF_ERROR;
|
|
600 }
|
|
601
|
|
602 lcf->upstream.schema.len = sizeof("memcached://") - 1;
|
|
603 lcf->upstream.schema.data = (u_char *) "memcached://";
|
|
604
|
|
605 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
|
|
606
|
|
607 clcf->handler = ngx_http_memcached_handler;
|
|
608
|
|
609 lcf->upstream.location = clcf->name;
|
|
610
|
|
611 if (clcf->name.data[clcf->name.len - 1] == '/') {
|
|
612 clcf->auto_redirect = 1;
|
|
613 }
|
|
614
|
|
615 return NGX_CONF_OK;
|
|
616 }
|