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comparison src/stream/ngx_stream_set_module.c @ 7713:45e9281c6c5b

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Stream: set module. Adds 'set' directive to the stream server context.
author Pavel Pautov <p.pautov@f5.com>
date Fri, 28 Aug 2020 14:10:54 -0700
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7712:eb940fe579cf 7713:45e9281c6c5b
1
2 /*
3 * Copyright (C) Pavel Pautov
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_stream.h>
11
12
13 typedef struct {
14 ngx_int_t index;
15 ngx_stream_set_variable_pt set_handler;
16 uintptr_t data;
17 ngx_stream_complex_value_t value;
18 } ngx_stream_set_cmd_t;
19
20
21 typedef struct {
22 ngx_array_t commands;
23 } ngx_stream_set_srv_conf_t;
24
25
26 static ngx_int_t ngx_stream_set_handler(ngx_stream_session_t *s);
27 static ngx_int_t ngx_stream_set_var(ngx_stream_session_t *s,
28 ngx_stream_variable_value_t *v, uintptr_t data);
29 static ngx_int_t ngx_stream_set_init(ngx_conf_t *cf);
30 static void *ngx_stream_set_create_srv_conf(ngx_conf_t *cf);
31 static char *ngx_stream_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
32
33
34 static ngx_command_t ngx_stream_set_commands[] = {
35
36 { ngx_string("set"),
37 NGX_STREAM_SRV_CONF|NGX_CONF_TAKE2,
38 ngx_stream_set,
39 NGX_STREAM_SRV_CONF_OFFSET,
40 0,
41 NULL },
42
43 ngx_null_command
44 };
45
46
47 static ngx_stream_module_t ngx_stream_set_module_ctx = {
48 NULL, /* preconfiguration */
49 ngx_stream_set_init, /* postconfiguration */
50
51 NULL, /* create main configuration */
52 NULL, /* init main configuration */
53
54 ngx_stream_set_create_srv_conf, /* create server configuration */
55 NULL /* merge server configuration */
56 };
57
58
59 ngx_module_t ngx_stream_set_module = {
60 NGX_MODULE_V1,
61 &ngx_stream_set_module_ctx, /* module context */
62 ngx_stream_set_commands, /* module directives */
63 NGX_STREAM_MODULE, /* module type */
64 NULL, /* init master */
65 NULL, /* init module */
66 NULL, /* init process */
67 NULL, /* init thread */
68 NULL, /* exit thread */
69 NULL, /* exit process */
70 NULL, /* exit master */
71 NGX_MODULE_V1_PADDING
72 };
73
74
75 static ngx_int_t
76 ngx_stream_set_handler(ngx_stream_session_t *s)
77 {
78 ngx_str_t str;
79 ngx_uint_t i;
80 ngx_stream_set_cmd_t *cmds;
81 ngx_stream_set_srv_conf_t *scf;
82 ngx_stream_variable_value_t vv;
83
84 scf = ngx_stream_get_module_srv_conf(s, ngx_stream_set_module);
85 cmds = scf->commands.elts;
86 vv = ngx_stream_variable_null_value;
87
88 for (i = 0; i < scf->commands.nelts; i++) {
89 if (ngx_stream_complex_value(s, &cmds[i].value, &str) != NGX_OK) {
90 return NGX_ERROR;
91 }
92
93 if (cmds[i].set_handler != NULL) {
94 vv.len = str.len;
95 vv.data = str.data;
96 cmds[i].set_handler(s, &vv, cmds[i].data);
97
98 } else {
99 s->variables[cmds[i].index].len = str.len;
100 s->variables[cmds[i].index].valid = 1;
101 s->variables[cmds[i].index].no_cacheable = 0;
102 s->variables[cmds[i].index].not_found = 0;
103 s->variables[cmds[i].index].data = str.data;
104 }
105 }
106
107 return NGX_DECLINED;
108 }
109
110
111 static ngx_int_t
112 ngx_stream_set_var(ngx_stream_session_t *s, ngx_stream_variable_value_t *v,
113 uintptr_t data)
114 {
115 *v = ngx_stream_variable_null_value;
116
117 return NGX_OK;
118 }
119
120
121 static ngx_int_t
122 ngx_stream_set_init(ngx_conf_t *cf)
123 {
124 ngx_stream_handler_pt *h;
125 ngx_stream_core_main_conf_t *cmcf;
126
127 cmcf = ngx_stream_conf_get_module_main_conf(cf, ngx_stream_core_module);
128
129 h = ngx_array_push(&cmcf->phases[NGX_STREAM_PREACCESS_PHASE].handlers);
130 if (h == NULL) {
131 return NGX_ERROR;
132 }
133
134 *h = ngx_stream_set_handler;
135
136 return NGX_OK;
137 }
138
139
140 static void *
141 ngx_stream_set_create_srv_conf(ngx_conf_t *cf)
142 {
143 ngx_stream_set_srv_conf_t *conf;
144
145 conf = ngx_pcalloc(cf->pool, sizeof(ngx_stream_set_srv_conf_t));
146 if (conf == NULL) {
147 return NULL;
148 }
149
150 /*
151 * set by ngx_pcalloc():
152 *
153 * conf->commands = { NULL };
154 */
155
156 return conf;
157 }
158
159
160 static char *
161 ngx_stream_set(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
162 {
163 ngx_stream_set_srv_conf_t *scf = conf;
164
165 ngx_str_t *args;
166 ngx_int_t index;
167 ngx_stream_set_cmd_t *set_cmd;
168 ngx_stream_variable_t *v;
169 ngx_stream_compile_complex_value_t ccv;
170
171 args = cf->args->elts;
172
173 if (args[1].data[0] != '$') {
174 ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
175 "invalid variable name \"%V\"", &args[1]);
176 return NGX_CONF_ERROR;
177 }
178
179 args[1].len--;
180 args[1].data++;
181
182 v = ngx_stream_add_variable(cf, &args[1],
183 NGX_STREAM_VAR_CHANGEABLE|NGX_STREAM_VAR_WEAK);
184 if (v == NULL) {
185 return NGX_CONF_ERROR;
186 }
187
188 index = ngx_stream_get_variable_index(cf, &args[1]);
189 if (index == NGX_ERROR) {
190 return NGX_CONF_ERROR;
191 }
192
193 if (v->get_handler == NULL) {
194 v->get_handler = ngx_stream_set_var;
195 }
196
197 if (scf->commands.elts == NULL) {
198 if (ngx_array_init(&scf->commands, cf->pool, 1,
199 sizeof(ngx_stream_set_cmd_t))
200 != NGX_OK)
201 {
202 return NGX_CONF_ERROR;
203 }
204 }
205
206 set_cmd = ngx_array_push(&scf->commands);
207 if (set_cmd == NULL) {
208 return NGX_CONF_ERROR;
209 }
210
211 set_cmd->index = index;
212 set_cmd->set_handler = v->set_handler;
213 set_cmd->data = v->data;
214
215 ngx_memzero(&ccv, sizeof(ngx_stream_compile_complex_value_t));
216
217 ccv.cf = cf;
218 ccv.value = &args[2];
219 ccv.complex_value = &set_cmd->value;
220
221 if (ngx_stream_compile_complex_value(&ccv) != NGX_OK) {
222 return NGX_CONF_ERROR;
223 }
224
225 return NGX_CONF_OK;
226 }