1
2 /*
3 * Copyright (C) Igor Sysoev
4 * Copyright (C) Nginx, Inc.
5 */
6
7
8 #include <ngx_config.h>
9 #include <ngx_core.h>
10 #include <ngx_http.h>
11
12
13 static ngx_int_t ngx_http_stub_status_variable(ngx_http_request_t *r,
14 ngx_http_variable_value_t *v, uintptr_t data);
15 static ngx_int_t ngx_http_stub_status_add_variables(ngx_conf_t *cf);
16
17 static char *ngx_http_set_status(ngx_conf_t *cf, ngx_command_t *cmd,
18 void *conf);
19
20 static ngx_command_t ngx_http_status_commands[] = {
21
22 { ngx_string("stub_status"),
23 NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
24 ngx_http_set_status,
25 0,
26 0,
27 NULL },
28
29 ngx_null_command
30 };
31
32
33
34 static ngx_http_module_t ngx_http_stub_status_module_ctx = {
35 ngx_http_stub_status_add_variables, /* preconfiguration */
36 NULL, /* postconfiguration */
37
38 NULL, /* create main configuration */
39 NULL, /* init main configuration */
40
41 NULL, /* create server configuration */
42 NULL, /* merge server configuration */
43
44 NULL, /* create location configuration */
45 NULL /* merge location configuration */
46 };
47
48
49 ngx_module_t ngx_http_stub_status_module = {
50 NGX_MODULE_V1,
51 &ngx_http_stub_status_module_ctx, /* module context */
52 ngx_http_status_commands, /* module directives */
53 NGX_HTTP_MODULE, /* module type */
54 NULL, /* init master */
55 NULL, /* init module */
56 NULL, /* init process */
57 NULL, /* init thread */
58 NULL, /* exit thread */
59 NULL, /* exit process */
60 NULL, /* exit master */
61 NGX_MODULE_V1_PADDING
62 };
63
64
65 static ngx_http_variable_t ngx_http_stub_status_vars[] = {
66
67 { ngx_string("connections_active"), NULL, ngx_http_stub_status_variable,
68 0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
69
70 { ngx_string("connections_reading"), NULL, ngx_http_stub_status_variable,
71 1, NGX_HTTP_VAR_NOCACHEABLE, 0 },
72
73 { ngx_string("connections_writing"), NULL, ngx_http_stub_status_variable,
74 2, NGX_HTTP_VAR_NOCACHEABLE, 0 },
75
76 { ngx_string("connections_waiting"), NULL, ngx_http_stub_status_variable,
77 3, NGX_HTTP_VAR_NOCACHEABLE, 0 },
78
79 { ngx_null_string, NULL, NULL, 0, 0, 0 }
80 };
81
82
83 static ngx_int_t ngx_http_status_handler(ngx_http_request_t *r)
84 {
85 size_t size;
86 ngx_int_t rc;
87 ngx_buf_t *b;
88 ngx_chain_t out;
89 ngx_atomic_int_t ap, hn, ac, rq, rd, wr, wa;
90
91 if (r->method != NGX_HTTP_GET && r->method != NGX_HTTP_HEAD) {
92 return NGX_HTTP_NOT_ALLOWED;
93 }
94
95 rc = ngx_http_discard_request_body(r);
96
97 if (rc != NGX_OK) {
98 return rc;
99 }
100
101 ngx_str_set(&r->headers_out.content_type, "text/plain");
102
103 if (r->method == NGX_HTTP_HEAD) {
104 r->headers_out.status = NGX_HTTP_OK;
105
106 rc = ngx_http_send_header(r);
107
108 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
109 return rc;
110 }
111 }
112
113 size = sizeof("Active connections: \n") + NGX_ATOMIC_T_LEN
114 + sizeof("server accepts handled requests\n") - 1
115 + 6 + 3 * NGX_ATOMIC_T_LEN
116 + sizeof("Reading: Writing: Waiting: \n") + 3 * NGX_ATOMIC_T_LEN;
117
118 b = ngx_create_temp_buf(r->pool, size);
119 if (b == NULL) {
120 return NGX_HTTP_INTERNAL_SERVER_ERROR;
121 }
122
123 out.buf = b;
124 out.next = NULL;
125
126 ap = *ngx_stat_accepted;
127 hn = *ngx_stat_handled;
128 ac = *ngx_stat_active;
129 rq = *ngx_stat_requests;
130 rd = *ngx_stat_reading;
131 wr = *ngx_stat_writing;
132 wa = *ngx_stat_waiting;
133
134 b->last = ngx_sprintf(b->last, "Active connections: %uA \n", ac);
135
136 b->last = ngx_cpymem(b->last, "server accepts handled requests\n",
137 sizeof("server accepts handled requests\n") - 1);
138
139 b->last = ngx_sprintf(b->last, " %uA %uA %uA \n", ap, hn, rq);
140
141 b->last = ngx_sprintf(b->last, "Reading: %uA Writing: %uA Waiting: %uA \n",
142 rd, wr, wa);
143
144 r->headers_out.status = NGX_HTTP_OK;
145 r->headers_out.content_length_n = b->last - b->pos;
146
147 b->last_buf = (r == r->main) ? 1 : 0;
148
149 rc = ngx_http_send_header(r);
150
151 if (rc == NGX_ERROR || rc > NGX_OK || r->header_only) {
152 return rc;
153 }
154
155 return ngx_http_output_filter(r, &out);
156 }
157
158
159 static ngx_int_t
160 ngx_http_stub_status_variable(ngx_http_request_t *r,
161 ngx_http_variable_value_t *v, uintptr_t data)
162 {
163 u_char *p;
164 ngx_atomic_int_t value;
165
166 p = ngx_pnalloc(r->pool, NGX_ATOMIC_T_LEN);
167 if (p == NULL) {
168 return NGX_ERROR;
169 }
170
171 switch (data) {
172 case 0:
173 value = *ngx_stat_active;
174 break;
175
176 case 1:
177 value = *ngx_stat_reading;
178 break;
179
180 case 2:
181 value = *ngx_stat_writing;
182 break;
183
184 case 3:
185 value = *ngx_stat_waiting;
186 break;
187
188 /* suppress warning */
189 default:
190 value = 0;
191 break;
192 }
193
194 v->len = ngx_sprintf(p, "%uA", value) - p;
195 v->valid = 1;
196 v->no_cacheable = 0;
197 v->not_found = 0;
198 v->data = p;
199
200 return NGX_OK;
201 }
202
203
204 static ngx_int_t
205 ngx_http_stub_status_add_variables(ngx_conf_t *cf)
206 {
207 ngx_http_variable_t *var, *v;
208
209 for (v = ngx_http_stub_status_vars; v->name.len; v++) {
210 var = ngx_http_add_variable(cf, &v->name, v->flags);
211 if (var == NULL) {
212 return NGX_ERROR;
213 }
214
215 var->get_handler = v->get_handler;
216 var->data = v->data;
217 }
218
219 return NGX_OK;
220 }
221
222
223 static char *ngx_http_set_status(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
224 {
225 ngx_http_core_loc_conf_t *clcf;
226
227 clcf = ngx_http_conf_get_module_loc_conf(cf, ngx_http_core_module);
228 clcf->handler = ngx_http_status_handler;
229
230 return NGX_CONF_OK;
231 }
232
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