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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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28
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50 char *uri_separator;
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51
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0
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52 in_port_t port;
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53
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54 unsigned default_port:1;
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55 } ngx_http_proxy_upstream_conf_t;
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56
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57
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58 typedef struct {
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2
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59 size_t send_lowat;
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0
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60 size_t header_buffer_size;
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61 size_t busy_buffers_size;
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62 size_t max_temp_file_size;
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63 size_t temp_file_write_size;
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64
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65 ngx_msec_t connect_timeout;
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66 ngx_msec_t send_timeout;
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67 ngx_msec_t read_timeout;
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68 time_t default_expires;
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69
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70 ngx_int_t lm_factor;
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71
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72 ngx_uint_t next_upstream;
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73 ngx_uint_t use_stale;
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74
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75 ngx_bufs_t bufs;
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76
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77 ngx_flag_t cyclic_temp_file;
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78 ngx_flag_t cache;
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79 ngx_flag_t preserve_host;
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6
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80 ngx_flag_t set_x_url;
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81 ngx_flag_t set_x_real_ip;
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82 ngx_flag_t add_x_forwarded_for;
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83 ngx_flag_t pass_server;
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84 ngx_flag_t pass_x_accel_expires;
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85 ngx_flag_t ignore_expires;
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86
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87 ngx_path_t *cache_path;
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88 ngx_path_t *temp_path;
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89
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90 ngx_http_busy_lock_t *busy_lock;
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91
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92 ngx_http_proxy_upstream_conf_t *upstream;
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93 ngx_peers_t *peers;
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94 } ngx_http_proxy_loc_conf_t;
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95
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96
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97 /*
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98 * "EXPR/10/5/- 200/EXP/60 4"
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99 * "MISS/-/-/B 503/-/- -"
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100 * "EXPR/10/20/SB HIT/-/- -"
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101 * "EXPR/10/15/NB HIT/-/- -"
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102 */
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103
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104 typedef struct {
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105 ngx_http_proxy_state_e cache_state;
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106 time_t expired;
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107 time_t bl_time;
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108 ngx_uint_t bl_state;
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109
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110 ngx_uint_t status;
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111 ngx_http_proxy_reason_e reason;
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112 time_t time;
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113 time_t expires;
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114
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115 ngx_str_t *peer;
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116 } ngx_http_proxy_state_t;
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117
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118
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119 typedef struct {
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120 ngx_list_t headers;
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121 #if 0
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122 ngx_table_t headers; /* it must be first field */
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123 #endif
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124
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125 ngx_table_elt_t *date;
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126 ngx_table_elt_t *server;
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127
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128 ngx_table_elt_t *expires;
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129 ngx_table_elt_t *cache_control;
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130 ngx_table_elt_t *etag;
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131 ngx_table_elt_t *x_accel_expires;
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132
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133 ngx_table_elt_t *connection;
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134 ngx_table_elt_t *content_type;
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135 ngx_table_elt_t *content_length;
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28
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136
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137 #if (NGX_HTTP_GZIP)
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4
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138 ngx_table_elt_t *content_encoding;
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28
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139 #endif
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140
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0
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141 ngx_table_elt_t *last_modified;
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142 ngx_table_elt_t *location;
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143 ngx_table_elt_t *accept_ranges;
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144 ngx_table_elt_t *x_pad;
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145
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146 off_t content_length_n;
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147 } ngx_http_proxy_headers_in_t;
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148
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149
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150 typedef struct {
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18
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151 ngx_http_cache_t ctx;
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152 ngx_uint_t status;
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153 ngx_str_t status_line;
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154
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155 ngx_http_proxy_headers_in_t headers_in;
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156 } ngx_http_proxy_cache_t;
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157
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158
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159 typedef struct {
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160 ngx_peer_connection_t peer;
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161 ngx_uint_t status;
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162 ngx_str_t status_line;
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163 ngx_uint_t method;
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164
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165 ngx_output_chain_ctx_t *output_chain_ctx;
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166 ngx_event_pipe_t *event_pipe;
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167
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168 ngx_http_proxy_headers_in_t headers_in;
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169 } ngx_http_proxy_upstream_t;
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170
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171
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172 typedef struct ngx_http_proxy_ctx_s ngx_http_proxy_ctx_t;
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173
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174 struct ngx_http_proxy_ctx_s {
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175 ngx_http_request_t *request;
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176 ngx_http_proxy_loc_conf_t *lcf;
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177 ngx_http_proxy_upstream_t *upstream;
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178 ngx_http_proxy_cache_t *cache;
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179
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180 ngx_buf_t *header_in;
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181
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182 ngx_http_busy_lock_ctx_t busy_lock;
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183
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184 unsigned accel:1;
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185
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186 unsigned cachable:1;
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187 unsigned stale:1;
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188 unsigned try_busy_lock:1;
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189 unsigned busy_locked:1;
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190 unsigned valid_header_in:1;
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191
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192 unsigned request_sent:1;
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193 unsigned header_sent:1;
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194
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195
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196 /* used to parse an upstream HTTP header */
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197 ngx_uint_t status;
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198 u_char *status_start;
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199 u_char *status_end;
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200 ngx_uint_t status_count;
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201 ngx_uint_t parse_state;
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202
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203 ngx_http_proxy_state_t *state;
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204 ngx_array_t states; /* of ngx_http_proxy_state_t */
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205
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206 /*
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207 * we declare "action" as "char *" because the actions are usually
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208 * the static strings and in the "u_char *" case we have to override
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209 * all the time their types
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210 */
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211
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212 char *action;
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213 ngx_http_log_ctx_t *saved_ctx;
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214 ngx_log_handler_pt saved_handler;
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215 };
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216
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217
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218 typedef struct {
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219 ngx_uint_t connection;
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220 ngx_http_proxy_ctx_t *proxy;
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221 } ngx_http_proxy_log_ctx_t;
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222
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223
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224 #define NGX_HTTP_PROXY_PARSE_NO_HEADER 30
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225
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226
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227 #define NGX_HTTP_PROXY_FT_ERROR 0x02
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228 #define NGX_HTTP_PROXY_FT_TIMEOUT 0x04
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229 #define NGX_HTTP_PROXY_FT_INVALID_HEADER 0x08
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230 #define NGX_HTTP_PROXY_FT_HTTP_500 0x10
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231 #define NGX_HTTP_PROXY_FT_HTTP_404 0x20
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232 #define NGX_HTTP_PROXY_FT_BUSY_LOCK 0x40
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233 #define NGX_HTTP_PROXY_FT_MAX_WAITING 0x80
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234
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235
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236 int ngx_http_proxy_request_upstream(ngx_http_proxy_ctx_t *p);
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237
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238 #if (NGX_HTTP_FILE_CACHE)
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239
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240 int ngx_http_proxy_get_cached_response(ngx_http_proxy_ctx_t *p);
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241 int ngx_http_proxy_send_cached_response(ngx_http_proxy_ctx_t *p);
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242 int ngx_http_proxy_is_cachable(ngx_http_proxy_ctx_t *p);
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243 int ngx_http_proxy_update_cache(ngx_http_proxy_ctx_t *p);
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244
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245 void ngx_http_proxy_cache_busy_lock(ngx_http_proxy_ctx_t *p);
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246
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247 #endif
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248
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249 void ngx_http_proxy_check_broken_connection(ngx_event_t *ev);
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250
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251 void ngx_http_proxy_busy_lock_handler(ngx_event_t *rev);
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252 void ngx_http_proxy_upstream_busy_lock(ngx_http_proxy_ctx_t *p);
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253
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254 u_char *ngx_http_proxy_log_error(void *data, u_char *buf, size_t len);
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255 void ngx_http_proxy_finalize_request(ngx_http_proxy_ctx_t *p, int rc);
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256 void ngx_http_proxy_close_connection(ngx_http_proxy_ctx_t *p);
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257
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258 int ngx_http_proxy_parse_status_line(ngx_http_proxy_ctx_t *p);
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259 int ngx_http_proxy_copy_header(ngx_http_proxy_ctx_t *p,
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260 ngx_http_proxy_headers_in_t *headers_in);
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261
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262
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263
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264 extern ngx_module_t ngx_http_proxy_module;
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265 extern ngx_http_header_t ngx_http_proxy_headers_in[];
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266
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267
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268
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269 #endif /* _NGX_HTTP_PROXY_HANDLER_H_INCLUDED_ */
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