annotate src/http/ngx_http_upstream.h @ 3440:88741ec7731a stable-0.7

merge r3294, r3305: Fix a bug introduced in r2032: After a child process has read a terminate message from a channel, the process tries to read the channel again. The kernel (at least FreeBSD) may preempt the process and sends a SIGIO signal to a master process. The master process sends a new terminate message, the kernel switches again to the the child process, and the child process reads the messages instead of an EAGAIN error. And this may repeat over and over. Being that the child process can not exit the cycle and test the termination flag set by the message handler. The fix disallow the master process to send a new terminate message on SIGIO signal reception. It may send the message only on SIGALARM signal.
author Igor Sysoev <igor@sysoev.ru>
date Mon, 01 Feb 2010 15:49:36 +0000
parents 61962127b166
children ebcee0063cd8 0d8b8c84bab7
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2 /*
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3 * Copyright (C) Igor Sysoev
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4 */
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7 #ifndef _NGX_HTTP_UPSTREAM_H_INCLUDED_
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8 #define _NGX_HTTP_UPSTREAM_H_INCLUDED_
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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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19 #define NGX_HTTP_UPSTREAM_FT_ERROR 0x00000002
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20 #define NGX_HTTP_UPSTREAM_FT_TIMEOUT 0x00000004
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21 #define NGX_HTTP_UPSTREAM_FT_INVALID_HEADER 0x00000008
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22 #define NGX_HTTP_UPSTREAM_FT_HTTP_500 0x00000010
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23 #define NGX_HTTP_UPSTREAM_FT_HTTP_502 0x00000020
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24 #define NGX_HTTP_UPSTREAM_FT_HTTP_503 0x00000040
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25 #define NGX_HTTP_UPSTREAM_FT_HTTP_504 0x00000080
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26 #define NGX_HTTP_UPSTREAM_FT_HTTP_404 0x00000100
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27 #define NGX_HTTP_UPSTREAM_FT_UPDATING 0x00000200
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28 #define NGX_HTTP_UPSTREAM_FT_BUSY_LOCK 0x00000400
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29 #define NGX_HTTP_UPSTREAM_FT_MAX_WAITING 0x00000800
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30 #define NGX_HTTP_UPSTREAM_FT_NOLIVE 0x40000000
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31 #define NGX_HTTP_UPSTREAM_FT_OFF 0x80000000
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33 #define NGX_HTTP_UPSTREAM_FT_STATUS (NGX_HTTP_UPSTREAM_FT_HTTP_500 \
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34 |NGX_HTTP_UPSTREAM_FT_HTTP_502 \
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35 |NGX_HTTP_UPSTREAM_FT_HTTP_503 \
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36 |NGX_HTTP_UPSTREAM_FT_HTTP_504 \
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37 |NGX_HTTP_UPSTREAM_FT_HTTP_404)
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39 #define NGX_HTTP_UPSTREAM_INVALID_HEADER 40
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41
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42 #define NGX_HTTP_UPSTREAM_IGN_XA_REDIRECT 0x00000002
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43 #define NGX_HTTP_UPSTREAM_IGN_XA_EXPIRES 0x00000004
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44 #define NGX_HTTP_UPSTREAM_IGN_EXPIRES 0x00000008
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45 #define NGX_HTTP_UPSTREAM_IGN_CACHE_CONTROL 0x00000010
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48 typedef struct {
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49 ngx_msec_t bl_time;
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50 ngx_uint_t bl_state;
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52 ngx_uint_t status;
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53 time_t response_sec;
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54 ngx_uint_t response_msec;
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55 off_t response_length;
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56
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57 ngx_str_t *peer;
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58 } ngx_http_upstream_state_t;
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61 typedef struct {
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62 ngx_hash_t headers_in_hash;
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63 ngx_array_t upstreams;
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64 /* ngx_http_upstream_srv_conf_t */
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65 } ngx_http_upstream_main_conf_t;
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66
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67 typedef struct ngx_http_upstream_srv_conf_s ngx_http_upstream_srv_conf_t;
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68
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69 typedef ngx_int_t (*ngx_http_upstream_init_pt)(ngx_conf_t *cf,
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70 ngx_http_upstream_srv_conf_t *us);
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71 typedef ngx_int_t (*ngx_http_upstream_init_peer_pt)(ngx_http_request_t *r,
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72 ngx_http_upstream_srv_conf_t *us);
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75 typedef struct {
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76 ngx_http_upstream_init_pt init_upstream;
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77 ngx_http_upstream_init_peer_pt init;
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78 void *data;
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79 } ngx_http_upstream_peer_t;
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82 typedef struct {
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83 ngx_peer_addr_t *addrs;
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84 ngx_uint_t naddrs;
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85 ngx_uint_t weight;
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86 ngx_uint_t max_fails;
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87 time_t fail_timeout;
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89 unsigned down:1;
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90 unsigned backup:1;
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91 } ngx_http_upstream_server_t;
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94 #define NGX_HTTP_UPSTREAM_CREATE 0x0001
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95 #define NGX_HTTP_UPSTREAM_WEIGHT 0x0002
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96 #define NGX_HTTP_UPSTREAM_MAX_FAILS 0x0004
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97 #define NGX_HTTP_UPSTREAM_FAIL_TIMEOUT 0x0008
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98 #define NGX_HTTP_UPSTREAM_DOWN 0x0010
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99 #define NGX_HTTP_UPSTREAM_BACKUP 0x0020
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102 struct ngx_http_upstream_srv_conf_s {
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103 ngx_http_upstream_peer_t peer;
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104 void **srv_conf;
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106 ngx_array_t *servers; /* ngx_http_upstream_server_t */
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107
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108 ngx_uint_t flags;
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109 ngx_str_t host;
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110 u_char *file_name;
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111 ngx_uint_t line;
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112 in_port_t port;
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113 in_port_t default_port;
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114 };
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116
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117 typedef struct {
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118 ngx_http_upstream_srv_conf_t *upstream;
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119
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120 ngx_msec_t connect_timeout;
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121 ngx_msec_t send_timeout;
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122 ngx_msec_t read_timeout;
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123 ngx_msec_t timeout;
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125 size_t send_lowat;
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126 size_t buffer_size;
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127
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128 size_t busy_buffers_size;
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129 size_t max_temp_file_size;
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130 size_t temp_file_write_size;
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131
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132 size_t busy_buffers_size_conf;
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133 size_t max_temp_file_size_conf;
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134 size_t temp_file_write_size_conf;
509
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diff changeset
135
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136 ngx_bufs_t bufs;
529
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parents: 527
diff changeset
137
2786
4e002555652d proxy_ignore_headers and fastcgi_ignore_headers
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parents: 2754
diff changeset
138 ngx_uint_t ignore_headers;
2592
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diff changeset
139 ngx_uint_t next_upstream;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
140 ngx_uint_t store_access;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
141 ngx_flag_t buffering;
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parents: 2422
diff changeset
142 ngx_flag_t pass_request_headers;
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parents: 2422
diff changeset
143 ngx_flag_t pass_request_body;
479
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parents:
diff changeset
144
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diff changeset
145 ngx_flag_t ignore_client_abort;
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parents: 2422
diff changeset
146 ngx_flag_t intercept_errors;
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parents: 2422
diff changeset
147 ngx_flag_t cyclic_temp_file;
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diff changeset
148
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diff changeset
149 ngx_path_t *temp_path;
479
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parents:
diff changeset
150
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diff changeset
151 ngx_hash_t hide_headers_hash;
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parents: 2422
diff changeset
152 ngx_array_t *hide_headers;
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parents: 2422
diff changeset
153 ngx_array_t *pass_headers;
509
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parents: 507
diff changeset
154
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diff changeset
155 #if (NGX_HTTP_CACHE)
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diff changeset
156 ngx_shm_zone_t *cache;
479
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diff changeset
157
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158 ngx_uint_t cache_min_uses;
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parents: 2422
diff changeset
159 ngx_uint_t cache_use_stale;
2875
6e1941b321b7 proxy_cache_methods and fastcgi_cache_methods
Igor Sysoev <igor@sysoev.ru>
parents: 2786
diff changeset
160 ngx_uint_t cache_methods;
479
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parents:
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161
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diff changeset
162 ngx_array_t *cache_valid;
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parents: 2422
diff changeset
163 #endif
509
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diff changeset
164
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diff changeset
165 ngx_array_t *store_lengths;
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parents: 2422
diff changeset
166 ngx_array_t *store_values;
1295
5383f5232364 proxy_store and fastcgi_store were changed,
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parents: 1291
diff changeset
167
2592
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diff changeset
168 signed store:2;
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parents: 2422
diff changeset
169 unsigned intercept_404:1;
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parents: 2422
diff changeset
170 unsigned change_buffering:1;
581
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Igor Sysoev <igor@sysoev.ru>
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diff changeset
171
577
4d9ea73a627a nginx-0.3.10-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents: 573
diff changeset
172 #if (NGX_HTTP_SSL)
2592
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diff changeset
173 ngx_ssl_t *ssl;
2754
7d16774c757c style fix
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parents: 2592
diff changeset
174 ngx_flag_t ssl_session_reuse;
577
4d9ea73a627a nginx-0.3.10-RELEASE import
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parents: 573
diff changeset
175 #endif
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diff changeset
176
479
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177 } ngx_http_upstream_conf_t;
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178
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179
509
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diff changeset
180 typedef struct {
2592
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181 ngx_str_t name;
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diff changeset
182 ngx_http_header_handler_pt handler;
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diff changeset
183 ngx_uint_t offset;
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diff changeset
184 ngx_http_header_handler_pt copy_handler;
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parents: 2422
diff changeset
185 ngx_uint_t conf;
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diff changeset
186 ngx_uint_t redirect; /* unsigned redirect:1; */
509
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187 } ngx_http_upstream_header_t;
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188
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diff changeset
189
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diff changeset
190 typedef struct {
2592
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diff changeset
191 ngx_list_t headers;
509
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parents: 507
diff changeset
192
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193 ngx_uint_t status_n;
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diff changeset
194 ngx_str_t status_line;
529
e5d7d0334fdb nginx-0.1.39-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents: 527
diff changeset
195
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196 ngx_table_elt_t *status;
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diff changeset
197 ngx_table_elt_t *date;
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diff changeset
198 ngx_table_elt_t *server;
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parents: 2422
diff changeset
199 ngx_table_elt_t *connection;
509
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Igor Sysoev <igor@sysoev.ru>
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diff changeset
200
2592
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diff changeset
201 ngx_table_elt_t *expires;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
202 ngx_table_elt_t *etag;
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parents: 2422
diff changeset
203 ngx_table_elt_t *x_accel_expires;
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diff changeset
204 ngx_table_elt_t *x_accel_redirect;
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parents: 2422
diff changeset
205 ngx_table_elt_t *x_accel_limit_rate;
509
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parents: 507
diff changeset
206
2592
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diff changeset
207 ngx_table_elt_t *content_type;
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parents: 2422
diff changeset
208 ngx_table_elt_t *content_length;
509
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Igor Sysoev <igor@sysoev.ru>
parents: 507
diff changeset
209
2592
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diff changeset
210 ngx_table_elt_t *last_modified;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
211 ngx_table_elt_t *location;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
212 ngx_table_elt_t *accept_ranges;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
213 ngx_table_elt_t *www_authenticate;
509
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parents: 507
diff changeset
214
9b8c906f6e63 nginx-0.1.29-RELEASE import
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diff changeset
215 #if (NGX_HTTP_GZIP)
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diff changeset
216 ngx_table_elt_t *content_encoding;
509
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parents: 507
diff changeset
217 #endif
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diff changeset
218
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diff changeset
219 off_t content_length_n;
1885
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Igor Sysoev <igor@sysoev.ru>
parents: 1701
diff changeset
220
2592
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diff changeset
221 ngx_array_t cache_control;
509
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parents: 507
diff changeset
222 } ngx_http_upstream_headers_in_t;
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diff changeset
223
479
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parents:
diff changeset
224
1658
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parents: 1565
diff changeset
225 typedef struct {
2592
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diff changeset
226 ngx_str_t host;
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parents: 2422
diff changeset
227 in_port_t port;
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parents: 2422
diff changeset
228 ngx_uint_t no_port; /* unsigned no_port:1 */
2422
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Igor Sysoev <igor@sysoev.ru>
parents: 2402
diff changeset
229
2592
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diff changeset
230 ngx_uint_t naddrs;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
231 in_addr_t *addrs;
2422
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Igor Sysoev <igor@sysoev.ru>
parents: 2402
diff changeset
232
2592
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Igor Sysoev <igor@sysoev.ru>
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diff changeset
233 struct sockaddr *sockaddr;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
234 socklen_t socklen;
2422
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Igor Sysoev <igor@sysoev.ru>
parents: 2402
diff changeset
235
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diff changeset
236 ngx_resolver_ctx_t *ctx;
1658
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Igor Sysoev <igor@sysoev.ru>
parents: 1565
diff changeset
237 } ngx_http_upstream_resolved_t;
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parents: 1565
diff changeset
238
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Igor Sysoev <igor@sysoev.ru>
parents: 1565
diff changeset
239
2386
4ccaa42de633 use already available r and u instead of ev
Igor Sysoev <igor@sysoev.ru>
parents: 2377
diff changeset
240 typedef void (*ngx_http_upstream_handler_pt)(ngx_http_request_t *r,
4ccaa42de633 use already available r and u instead of ev
Igor Sysoev <igor@sysoev.ru>
parents: 2377
diff changeset
241 ngx_http_upstream_t *u);
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parents: 2377
diff changeset
242
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parents: 2377
diff changeset
243
479
c52408583801 nginx-0.1.14-RELEASE import
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parents:
diff changeset
244 struct ngx_http_upstream_s {
2592
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parents: 2422
diff changeset
245 ngx_http_upstream_handler_pt read_event_handler;
3a8a53c0c42f a prelimiary proxy cache support
Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
246 ngx_http_upstream_handler_pt write_event_handler;
2377
87b8c44906b5 *) refactor subrequest handling, now they run as separate posted requests
Igor Sysoev <igor@sysoev.ru>
parents: 2285
diff changeset
247
2592
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diff changeset
248 ngx_peer_connection_t peer;
479
c52408583801 nginx-0.1.14-RELEASE import
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parents:
diff changeset
249
2592
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diff changeset
250 ngx_event_pipe_t *pipe;
479
c52408583801 nginx-0.1.14-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
251
2592
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diff changeset
252 ngx_chain_t *request_bufs;
479
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parents:
diff changeset
253
2592
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diff changeset
254 ngx_output_chain_ctx_t output;
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
255 ngx_chain_writer_ctx_t writer;
479
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parents:
diff changeset
256
2592
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diff changeset
257 ngx_http_upstream_conf_t *conf;
479
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diff changeset
258
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diff changeset
259 ngx_http_upstream_headers_in_t headers_in;
509
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parents: 507
diff changeset
260
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diff changeset
261 ngx_http_upstream_resolved_t *resolved;
1658
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parents: 1565
diff changeset
262
2592
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diff changeset
263 ngx_buf_t buffer;
3a8a53c0c42f a prelimiary proxy cache support
Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
264 size_t length;
581
326634fb9d47 nginx-0.3.12-RELEASE import
Igor Sysoev <igor@sysoev.ru>
parents: 577
diff changeset
265
2592
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diff changeset
266 ngx_chain_t *out_bufs;
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parents: 2422
diff changeset
267 ngx_chain_t *busy_bufs;
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parents: 2422
diff changeset
268 ngx_chain_t *free_bufs;
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parents: 577
diff changeset
269
2592
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diff changeset
270 ngx_int_t (*input_filter_init)(void *data);
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Igor Sysoev <igor@sysoev.ru>
parents: 2422
diff changeset
271 ngx_int_t (*input_filter)(void *data, ssize_t bytes);
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272 void *input_filter_ctx;
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273
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274 #if (NGX_HTTP_CACHE)
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275 ngx_int_t (*create_key)(ngx_http_request_t *r);
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276 #endif
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277 ngx_int_t (*create_request)(ngx_http_request_t *r);
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278 ngx_int_t (*reinit_request)(ngx_http_request_t *r);
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279 ngx_int_t (*process_header)(ngx_http_request_t *r);
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280 void (*abort_request)(ngx_http_request_t *r);
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281 void (*finalize_request)(ngx_http_request_t *r,
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282 ngx_int_t rc);
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283 ngx_int_t (*rewrite_redirect)(ngx_http_request_t *r,
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284 ngx_table_elt_t *h, size_t prefix);
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285
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286 ngx_msec_t timeout;
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287
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288 ngx_http_upstream_state_t *state;
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289
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290 ngx_str_t method;
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291 ngx_str_t schema;
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292 ngx_str_t uri;
555
7bd37aef1e7e nginx-0.2.6-RELEASE import
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293
2592
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294 ngx_http_cleanup_pt *cleanup;
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295
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296 unsigned store:1;
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297 unsigned cacheable:1;
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298 unsigned accel:1;
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299 unsigned ssl:1;
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300 #if (NGX_HTTP_CACHE)
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301 unsigned cache_status:3;
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302 #endif
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303
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304 unsigned buffering:1;
649
1e720b0be7ec nginx-0.3.46-RELEASE import
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305
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306 unsigned request_sent:1;
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307 unsigned header_sent:1;
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308 };
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309
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310
2268
33556140681a *) ngx_http_upstream_test_next()
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311 typedef struct {
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312 ngx_uint_t status;
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313 ngx_uint_t mask;
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314 } ngx_http_upstream_next_t;
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315
33556140681a *) ngx_http_upstream_test_next()
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316
1162
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317 ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r,
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318 ngx_http_variable_value_t *v, uintptr_t data);
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319
3245
61962127b166 merge r3001, r3007, r3013:
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320 ngx_int_t ngx_http_upstream_create(ngx_http_request_t *r);
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321 void ngx_http_upstream_init(ngx_http_request_t *r);
651
39b7d7b33c91 nginx-0.3.47-RELEASE import
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322 ngx_http_upstream_srv_conf_t *ngx_http_upstream_add(ngx_conf_t *cf,
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323 ngx_url_t *u, ngx_uint_t flags);
1701
40d004d95d88 *) now ngx_conf_set_str_array_slot() tests NGX_CONF_UNSET_PTR
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324 ngx_int_t ngx_http_upstream_hide_headers_hash(ngx_conf_t *cf,
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325 ngx_http_upstream_conf_t *conf, ngx_http_upstream_conf_t *prev,
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326 ngx_str_t *default_hide_headers, ngx_hash_init_t *hash);
884
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diff changeset
327
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diff changeset
328
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329 #define ngx_http_conf_upstream_srv_conf(uscf, module) \
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330 uscf->srv_conf[module.ctx_index]
509
9b8c906f6e63 nginx-0.1.29-RELEASE import
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331
479
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332
2875
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333 extern ngx_module_t ngx_http_upstream_module;
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334 extern ngx_conf_bitmask_t ngx_http_upstream_cache_method_mask[];
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335
479
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336
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337
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338 #endif /* _NGX_HTTP_UPSTREAM_H_INCLUDED_ */