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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 #ifndef _NGX_HTTP_PROXY_HANDLER_H_INCLUDED_
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8 #define _NGX_HTTP_PROXY_HANDLER_H_INCLUDED_
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9
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10
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11 #include <ngx_config.h>
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12 #include <ngx_core.h>
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13 #include <ngx_event.h>
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14 #include <ngx_event_connect.h>
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15 #include <ngx_event_pipe.h>
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16 #include <ngx_http.h>
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17
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18
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19 typedef enum {
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20 NGX_HTTP_PROXY_CACHE_PASS = 1,
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21 NGX_HTTP_PROXY_CACHE_BYPASS,
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22 NGX_HTTP_PROXY_CACHE_AUTH,
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23 NGX_HTTP_PROXY_CACHE_PGNC,
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24 NGX_HTTP_PROXY_CACHE_MISS,
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25 NGX_HTTP_PROXY_CACHE_EXPR,
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26 NGX_HTTP_PROXY_CACHE_AGED,
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27 NGX_HTTP_PROXY_CACHE_HIT
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28 } ngx_http_proxy_state_e;
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29
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30
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31 typedef enum {
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32 NGX_HTTP_PROXY_CACHE_BPS = 1,
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33 NGX_HTTP_PROXY_CACHE_XAE,
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34 NGX_HTTP_PROXY_CACHE_CTL,
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35 NGX_HTTP_PROXY_CACHE_EXP,
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36 NGX_HTTP_PROXY_CACHE_MVD,
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37 NGX_HTTP_PROXY_CACHE_LMF,
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38 NGX_HTTP_PROXY_CACHE_PDE
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39 } ngx_http_proxy_reason_e;
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40
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41
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42 typedef struct {
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43 ngx_str_t url;
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44 ngx_str_t host;
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45 ngx_str_t uri;
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46 ngx_str_t host_header;
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47 ngx_str_t port_text;
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48 ngx_str_t *location;
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49
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50 in_port_t port;
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51
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52 unsigned default_port:1;
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53 } ngx_http_proxy_upstream_conf_t;
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54
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55
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56 typedef struct {
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57 size_t header_buffer_size;
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58 size_t busy_buffers_size;
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59 size_t max_temp_file_size;
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60 size_t temp_file_write_size;
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61
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62 ngx_msec_t connect_timeout;
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63 ngx_msec_t send_timeout;
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64 ngx_msec_t read_timeout;
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65 time_t default_expires;
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66
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67 ngx_int_t lm_factor;
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68
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69 ngx_uint_t next_upstream;
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70 ngx_uint_t use_stale;
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71
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72 ngx_bufs_t bufs;
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73
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74 ngx_flag_t cyclic_temp_file;
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75 ngx_flag_t cache;
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76 ngx_flag_t preserve_host;
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77 ngx_flag_t set_x_real_ip;
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78 ngx_flag_t add_x_forwarded_for;
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79 ngx_flag_t pass_server;
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80 ngx_flag_t pass_x_accel_expires;
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81 ngx_flag_t ignore_expires;
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82
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83 ngx_path_t *cache_path;
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84 ngx_path_t *temp_path;
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85
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86 ngx_http_busy_lock_t *busy_lock;
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87
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88 ngx_http_proxy_upstream_conf_t *upstream;
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89 ngx_peers_t *peers;
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90 } ngx_http_proxy_loc_conf_t;
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91
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92
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93 /*
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94 * "EXPR/10/5/- 200/EXP/60 4"
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95 * "MISS/-/-/B 503/-/- -"
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96 * "EXPR/10/20/SB HIT/-/- -"
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97 * "EXPR/10/15/NB HIT/-/- -"
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98 */
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99
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100 typedef struct {
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101 ngx_http_proxy_state_e cache_state;
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102 time_t expired;
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103 time_t bl_time;
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104 ngx_uint_t bl_state;
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105
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106 ngx_uint_t status;
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107 ngx_http_proxy_reason_e reason;
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108 time_t time;
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109 time_t expires;
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110
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111 ngx_str_t *peer;
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112 } ngx_http_proxy_state_t;
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113
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114
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115 typedef struct {
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116 ngx_list_t headers;
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117 #if 0
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118 ngx_table_t headers; /* it must be first field */
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119 #endif
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120
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121 ngx_table_elt_t *date;
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122 ngx_table_elt_t *server;
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123
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124 ngx_table_elt_t *expires;
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125 ngx_table_elt_t *cache_control;
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126 ngx_table_elt_t *etag;
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127 ngx_table_elt_t *x_accel_expires;
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128
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129 ngx_table_elt_t *connection;
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130 ngx_table_elt_t *content_type;
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131 ngx_table_elt_t *content_length;
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132 ngx_table_elt_t *last_modified;
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133 ngx_table_elt_t *location;
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134 ngx_table_elt_t *accept_ranges;
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135 ngx_table_elt_t *x_pad;
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136
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137 off_t content_length_n;
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138 } ngx_http_proxy_headers_in_t;
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139
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140
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141 typedef struct {
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142 ngx_http_cache_ctx_t ctx;
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143 ngx_uint_t status;
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144 ngx_str_t status_line;
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145
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146 ngx_http_proxy_headers_in_t headers_in;
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147 } ngx_http_proxy_cache_t;
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148
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149
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150 typedef struct {
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151 ngx_peer_connection_t peer;
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152 ngx_uint_t status;
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153 ngx_str_t status_line;
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154 ngx_uint_t method;
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155
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156 ngx_output_chain_ctx_t *output_chain_ctx;
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157 ngx_event_pipe_t *event_pipe;
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158
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159 ngx_http_proxy_headers_in_t headers_in;
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160 } ngx_http_proxy_upstream_t;
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161
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162
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163 typedef struct ngx_http_proxy_ctx_s ngx_http_proxy_ctx_t;
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164
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165 struct ngx_http_proxy_ctx_s {
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166 ngx_http_request_t *request;
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167 ngx_http_proxy_loc_conf_t *lcf;
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168 ngx_http_proxy_upstream_t *upstream;
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169 ngx_http_proxy_cache_t *cache;
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170
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171 ngx_buf_t *header_in;
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172
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173 ngx_http_busy_lock_ctx_t busy_lock;
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174
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175 unsigned accel:1;
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176
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177 unsigned cachable:1;
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178 unsigned stale:1;
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179 unsigned try_busy_lock:1;
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180 unsigned busy_locked:1;
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181 unsigned valid_header_in:1;
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182
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183 unsigned request_sent:1;
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184 unsigned header_sent:1;
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185
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186
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187 /* used to parse an upstream HTTP header */
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188 ngx_uint_t status;
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189 u_char *status_start;
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190 u_char *status_end;
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191 ngx_uint_t status_count;
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192 ngx_uint_t parse_state;
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193
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194 ngx_http_proxy_state_t *state;
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195 ngx_array_t states; /* of ngx_http_proxy_state_t */
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196
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197 /*
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198 * we declare "action" as "char *" because the actions are usually
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199 * the static strings and in the "u_char *" case we have to override
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200 * all the time their types
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201 */
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202
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203 char *action;
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204 ngx_http_log_ctx_t *saved_ctx;
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205 ngx_log_handler_pt saved_handler;
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206 };
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207
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208
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209 typedef struct {
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210 ngx_uint_t connection;
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211 ngx_http_proxy_ctx_t *proxy;
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212 } ngx_http_proxy_log_ctx_t;
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213
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214
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215 #define NGX_HTTP_PROXY_PARSE_NO_HEADER 30
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216
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217
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218 #define NGX_HTTP_PROXY_FT_ERROR 0x02
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219 #define NGX_HTTP_PROXY_FT_TIMEOUT 0x04
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220 #define NGX_HTTP_PROXY_FT_INVALID_HEADER 0x08
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221 #define NGX_HTTP_PROXY_FT_HTTP_500 0x10
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222 #define NGX_HTTP_PROXY_FT_HTTP_404 0x20
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223 #define NGX_HTTP_PROXY_FT_BUSY_LOCK 0x40
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224 #define NGX_HTTP_PROXY_FT_MAX_WAITING 0x80
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225
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226
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227 int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p);
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228
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229 #if (NGX_HTTP_FILE_CACHE)
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230
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231 int ngx_http_proxy_get_cached_response(ngx_http_proxy_ctx_t *p);
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232 int ngx_http_proxy_send_cached_response(ngx_http_proxy_ctx_t *p);
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233 int ngx_http_proxy_is_cachable(ngx_http_proxy_ctx_t *p);
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234 int ngx_http_proxy_update_cache(ngx_http_proxy_ctx_t *p);
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235
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236 void ngx_http_proxy_cache_busy_lock(ngx_http_proxy_ctx_t *p);
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237
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238 #endif
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239
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240 void ngx_http_proxy_check_broken_connection(ngx_event_t *ev);
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241
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242 void ngx_http_proxy_busy_lock_handler(ngx_event_t *rev);
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243 void ngx_http_proxy_upstream_busy_lock(ngx_http_proxy_ctx_t *p);
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244
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245 size_t ngx_http_proxy_log_error(void *data, char *buf, size_t len);
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246 void ngx_http_proxy_finalize_request(ngx_http_proxy_ctx_t *p, int rc);
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247 void ngx_http_proxy_close_connection(ngx_http_proxy_ctx_t *p);
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248
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249 int ngx_http_proxy_parse_status_line(ngx_http_proxy_ctx_t *p);
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250 int ngx_http_proxy_copy_header(ngx_http_proxy_ctx_t *p,
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251 ngx_http_proxy_headers_in_t *headers_in);
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252
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253
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254
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255 extern ngx_module_t ngx_http_proxy_module;
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256 extern ngx_http_header_t ngx_http_proxy_headers_in[];
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257
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258
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259
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260 #endif /* _NGX_HTTP_PROXY_HANDLER_H_INCLUDED_ */
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