1
2 /*
3 * Copyright (C) Igor Sysoev
4 */
5
6
7 #ifndef _NGX_HTTP_UPSTREAM_H_INCLUDED_
8 #define _NGX_HTTP_UPSTREAM_H_INCLUDED_
9
10
11 #include <ngx_config.h>
12 #include <ngx_core.h>
13 #include <ngx_event.h>
14 #include <ngx_event_connect.h>
15 #include <ngx_event_pipe.h>
16 #include <ngx_http.h>
17
18
19 #define NGX_HTTP_UPSTREAM_FT_ERROR 0x00000002
20 #define NGX_HTTP_UPSTREAM_FT_TIMEOUT 0x00000004
21 #define NGX_HTTP_UPSTREAM_FT_INVALID_HEADER 0x00000008
22 #define NGX_HTTP_UPSTREAM_FT_HTTP_500 0x00000010
23 #define NGX_HTTP_UPSTREAM_FT_HTTP_503 0x00000020
24 #define NGX_HTTP_UPSTREAM_FT_HTTP_404 0x00000040
25 #define NGX_HTTP_UPSTREAM_FT_BUSY_LOCK 0x00000080
26 #define NGX_HTTP_UPSTREAM_FT_MAX_WAITING 0x00000100
27 #define NGX_HTTP_UPSTREAM_FT_NOLIVE 0x40000000
28 #define NGX_HTTP_UPSTREAM_FT_OFF 0x80000000
29
30
31 #define NGX_HTTP_UPSTREAM_INVALID_HEADER 40
32
33
34 typedef struct {
35 ngx_msec_t bl_time;
36 ngx_uint_t bl_state;
37
38 ngx_uint_t status;
39 time_t response_sec;
40 ngx_uint_t response_msec;
41
42 ngx_str_t *peer;
43 } ngx_http_upstream_state_t;
44
45
46 typedef struct {
47 ngx_hash_t headers_in_hash;
48 ngx_array_t upstreams;
49 /* ngx_http_upstream_srv_conf_t */
50 } ngx_http_upstream_main_conf_t;
51
52 typedef struct ngx_http_upstream_srv_conf_s ngx_http_upstream_srv_conf_t;
53
54 typedef ngx_int_t (*ngx_http_upstream_init_pt)(ngx_conf_t *cf,
55 ngx_http_upstream_srv_conf_t *us);
56 typedef ngx_int_t (*ngx_http_upstream_init_peer_pt)(ngx_http_request_t *r,
57 ngx_http_upstream_srv_conf_t *us);
58
59
60 typedef struct {
61 ngx_http_upstream_init_pt init_upstream;
62 ngx_http_upstream_init_peer_pt init;
63 void *data;
64 } ngx_http_upstream_peer_t;
65
66
67 typedef struct {
68 ngx_peer_addr_t *addrs;
69 ngx_uint_t naddrs;
70 ngx_uint_t weight;
71 ngx_uint_t max_fails;
72 time_t fail_timeout;
73
74 unsigned down:1;
75 unsigned backup:1;
76 } ngx_http_upstream_server_t;
77
78
79 #define NGX_HTTP_UPSTREAM_CREATE 0x0001
80 #define NGX_HTTP_UPSTREAM_WEIGHT 0x0002
81 #define NGX_HTTP_UPSTREAM_MAX_FAILS 0x0004
82 #define NGX_HTTP_UPSTREAM_FAIL_TIMEOUT 0x0008
83 #define NGX_HTTP_UPSTREAM_DOWN 0x0010
84 #define NGX_HTTP_UPSTREAM_BACKUP 0x0020
85
86
87 struct ngx_http_upstream_srv_conf_s {
88 ngx_http_upstream_peer_t peer;
89 void **srv_conf;
90
91 ngx_array_t *servers; /* ngx_http_upstream_server_t */
92
93 ngx_uint_t flags;
94 ngx_str_t host;
95 u_char *file_name;
96 ngx_uint_t line;
97 in_port_t port;
98 in_port_t default_port;
99 };
100
101
102 typedef struct {
103 ngx_http_upstream_srv_conf_t *upstream;
104
105 ngx_msec_t connect_timeout;
106 ngx_msec_t send_timeout;
107 ngx_msec_t read_timeout;
108 ngx_msec_t timeout;
109
110 size_t send_lowat;
111 size_t buffer_size;
112
113 size_t busy_buffers_size;
114 size_t max_temp_file_size;
115 size_t temp_file_write_size;
116
117 size_t busy_buffers_size_conf;
118 size_t max_temp_file_size_conf;
119 size_t temp_file_write_size_conf;
120
121 ngx_uint_t next_upstream;
122 ngx_uint_t store_access;
123
124 ngx_bufs_t bufs;
125
126 ngx_flag_t buffering;
127 ngx_flag_t pass_request_headers;
128 ngx_flag_t pass_request_body;
129
130 ngx_flag_t ignore_client_abort;
131 ngx_flag_t intercept_errors;
132 ngx_flag_t cyclic_temp_file;
133
134 ngx_path_t *temp_path;
135
136 ngx_hash_t hide_headers_hash;
137 ngx_array_t *hide_headers;
138 ngx_array_t *pass_headers;
139
140 ngx_str_t schema;
141
142 ngx_array_t *store_lengths;
143 ngx_array_t *store_values;
144
145 signed store:2;
146 unsigned intercept_404:1;
147 unsigned change_buffering:1;
148
149 #if (NGX_HTTP_SSL)
150 ngx_ssl_t *ssl;
151 #endif
152
153 } ngx_http_upstream_conf_t;
154
155
156 typedef struct {
157 ngx_str_t name;
158 ngx_http_header_handler_pt handler;
159 ngx_uint_t offset;
160 ngx_http_header_handler_pt copy_handler;
161 ngx_uint_t conf;
162 ngx_uint_t redirect; /* unsigned redirect:1; */
163 } ngx_http_upstream_header_t;
164
165
166 typedef struct {
167 ngx_list_t headers;
168
169 ngx_uint_t status_n;
170 ngx_str_t status_line;
171
172 ngx_table_elt_t *status;
173 ngx_table_elt_t *date;
174 ngx_table_elt_t *server;
175 ngx_table_elt_t *connection;
176
177 ngx_table_elt_t *expires;
178 ngx_table_elt_t *etag;
179 ngx_table_elt_t *x_accel_expires;
180 ngx_table_elt_t *x_accel_redirect;
181 ngx_table_elt_t *x_accel_limit_rate;
182
183 ngx_table_elt_t *content_type;
184 ngx_table_elt_t *content_length;
185
186 ngx_table_elt_t *last_modified;
187 ngx_table_elt_t *location;
188 ngx_table_elt_t *accept_ranges;
189 ngx_table_elt_t *www_authenticate;
190
191 #if (NGX_HTTP_GZIP)
192 ngx_table_elt_t *content_encoding;
193 #endif
194
195 off_t content_length_n;
196
197 ngx_array_t cache_control;
198 } ngx_http_upstream_headers_in_t;
199
200
201 typedef struct {
202 ngx_str_t host;
203 in_port_t port;
204 ngx_uint_t naddrs;
205 in_addr_t *addrs;
206 ngx_resolver_ctx_t *ctx;
207 } ngx_http_upstream_resolved_t;
208
209
210 struct ngx_http_upstream_s {
211 ngx_peer_connection_t peer;
212
213 ngx_event_pipe_t *pipe;
214
215 ngx_chain_t *request_bufs;
216
217 ngx_output_chain_ctx_t output;
218 ngx_chain_writer_ctx_t writer;
219
220 ngx_http_upstream_conf_t *conf;
221
222 ngx_http_upstream_headers_in_t headers_in;
223
224 ngx_http_upstream_resolved_t *resolved;
225
226 ngx_buf_t buffer;
227 size_t length;
228
229 ngx_chain_t *out_bufs;
230 ngx_chain_t *busy_bufs;
231 ngx_chain_t *free_bufs;
232
233 ngx_int_t (*input_filter_init)(void *data);
234 ngx_int_t (*input_filter)(void *data, ssize_t bytes);
235 void *input_filter_ctx;
236
237 ngx_int_t (*create_request)(ngx_http_request_t *r);
238 ngx_int_t (*reinit_request)(ngx_http_request_t *r);
239 ngx_int_t (*process_header)(ngx_http_request_t *r);
240 void (*abort_request)(ngx_http_request_t *r);
241 void (*finalize_request)(ngx_http_request_t *r,
242 ngx_int_t rc);
243 ngx_int_t (*rewrite_redirect)(ngx_http_request_t *r,
244 ngx_table_elt_t *h, size_t prefix);
245
246 ngx_msec_t timeout;
247
248 ngx_http_upstream_state_t *state;
249
250 ngx_str_t method;
251 ngx_str_t schema;
252 ngx_str_t uri;
253
254 ngx_http_cleanup_pt *cleanup;
255
256 unsigned store:1;
257 unsigned cacheable:1;
258 unsigned accel:1;
259 unsigned ssl:1;
260
261 unsigned buffering:1;
262
263 unsigned request_sent:1;
264 unsigned header_sent:1;
265 };
266
267
268 ngx_int_t ngx_http_upstream_header_variable(ngx_http_request_t *r,
269 ngx_http_variable_value_t *v, uintptr_t data);
270
271 void ngx_http_upstream_init(ngx_http_request_t *r);
272 ngx_http_upstream_srv_conf_t *ngx_http_upstream_add(ngx_conf_t *cf,
273 ngx_url_t *u, ngx_uint_t flags);
274 ngx_int_t ngx_http_upstream_hide_headers_hash(ngx_conf_t *cf,
275 ngx_http_upstream_conf_t *conf, ngx_http_upstream_conf_t *prev,
276 ngx_str_t *default_hide_headers, ngx_hash_init_t *hash);
277
278
279 #define ngx_http_conf_upstream_srv_conf(uscf, module) \
280 uscf->srv_conf[module.ctx_index]
281
282
283 extern ngx_module_t ngx_http_upstream_module;
284
285
286 #endif /* _NGX_HTTP_UPSTREAM_H_INCLUDED_ */
287
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