Merge branch 'master' into merge/collectd-4
[collectd.git] / src / apache.c
1 /**
2  * collectd - src/apache.c
3  * Copyright (C) 2006  Florian octo Forster
4  * Copyright (C) 2007  Florent EppO Monbillard
5  *
6  * This program is free software; you can redistribute it and/or modify it
7  * under the terms of the GNU General Public License as published by the
8  * Free Software Foundation; only version 2 of the License is applicable.
9  *
10  * This program is distributed in the hope that it will be useful, but
11  * WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13  * General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License along
16  * with this program; if not, write to the Free Software Foundation, Inc.,
17  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
18  *
19  * Authors:
20  *   Florian octo Forster <octo at verplant.org>
21  *   Florent EppO Monbillard <eppo at darox.net>
22  *   - connections/lighttpd extension
23  **/
24
25 #include "collectd.h"
26 #include "common.h"
27 #include "plugin.h"
28 #include "configfile.h"
29 #include "utils_debug.h"
30
31 #if HAVE_LIBCURL && HAVE_CURL_CURL_H
32 #  define APACHE_HAVE_READ 1
33 #  include <curl/curl.h>
34 #else
35 #  define APACHE_HAVE_READ 0
36 #endif
37
38 /* Limit to 2^27 bytes/s. That's what a gigabit-ethernet link can handle, in
39  * theory. */
40 static data_source_t apache_bytes_dsrc[1] =
41 {
42         {"count", DS_TYPE_COUNTER, 0, 134217728.0},
43 };
44
45 static data_set_t apache_bytes_ds =
46 {
47         "apache_bytes", 1, apache_bytes_dsrc
48 };
49
50 /* Limit to 2^20 requests/s */
51 static data_source_t apache_requests_dsrc[1] =
52 {
53         {"count", DS_TYPE_COUNTER, 0, 134217728.0},
54 };
55
56 static data_set_t apache_requests_ds =
57 {
58         "apache_requests", 1, apache_requests_dsrc
59 };
60
61 static data_source_t apache_scoreboard_dsrc[1] =
62 {
63         {"count", DS_TYPE_GAUGE, 0, 65535.0},
64 };
65
66 static data_set_t apache_scoreboard_ds =
67 {
68         "apache_scoreboard", 1, apache_scoreboard_dsrc
69 };
70
71 static data_source_t apache_connections_dsrc[1] =
72 {
73         {"count", DS_TYPE_GAUGE, 0, 65535.0},
74 };
75
76 static data_set_t apache_connections_ds =
77 {
78         "apache_connections", 1, apache_connections_dsrc
79 };
80
81 #if APACHE_HAVE_READ
82 static char *url    = NULL;
83 static char *user   = NULL;
84 static char *pass   = NULL;
85 static char *cacert = NULL;
86
87 static CURL *curl = NULL;
88
89 #define ABUFFER_SIZE 16384
90 static char apache_buffer[ABUFFER_SIZE];
91 static int  apache_buffer_len = 0;
92 static char apache_curl_error[CURL_ERROR_SIZE];
93
94 static const char *config_keys[] =
95 {
96         "URL",
97         "User",
98         "Password",
99         "CACert",
100         NULL
101 };
102 static int config_keys_num = 4;
103
104 static size_t apache_curl_callback (void *buf, size_t size, size_t nmemb, void *stream)
105 {
106         size_t len = size * nmemb;
107
108         if ((apache_buffer_len + len) >= ABUFFER_SIZE)
109         {
110                 len = (ABUFFER_SIZE - 1) - apache_buffer_len;
111         }
112
113         if (len <= 0)
114                 return (len);
115
116         memcpy (apache_buffer + apache_buffer_len, (char *) buf, len);
117         apache_buffer_len += len;
118         apache_buffer[apache_buffer_len] = '\0';
119
120         return (len);
121 }
122
123 static int config_set (char **var, const char *value)
124 {
125         if (*var != NULL)
126         {
127                 free (*var);
128                 *var = NULL;
129         }
130
131         if ((*var = strdup (value)) == NULL)
132                 return (1);
133         else
134                 return (0);
135 }
136
137 static int config (const char *key, const char *value)
138 {
139         if (strcasecmp (key, "url") == 0)
140                 return (config_set (&url, value));
141         else if (strcasecmp (key, "user") == 0)
142                 return (config_set (&user, value));
143         else if (strcasecmp (key, "password") == 0)
144                 return (config_set (&pass, value));
145         else if (strcasecmp (key, "cacert") == 0)
146                 return (config_set (&cacert, value));
147         else
148                 return (-1);
149 }
150
151 static int init (void)
152 {
153         static char credentials[1024];
154
155         if (curl != NULL)
156         {
157                 curl_easy_cleanup (curl);
158         }
159
160         if ((curl = curl_easy_init ()) == NULL)
161         {
162                 syslog (LOG_ERR, "apache: `curl_easy_init' failed.");
163                 return (-1);
164         }
165
166         curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, apache_curl_callback);
167         curl_easy_setopt (curl, CURLOPT_USERAGENT, PACKAGE_NAME"/"PACKAGE_VERSION);
168         curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, apache_curl_error);
169
170         if (user != NULL)
171         {
172                 if (snprintf (credentials, 1024, "%s:%s", user, pass == NULL ? "" : pass) >= 1024)
173                 {
174                         syslog (LOG_ERR, "apache: Credentials would have been truncated.");
175                         return (-1);
176                 }
177
178                 curl_easy_setopt (curl, CURLOPT_USERPWD, credentials);
179         }
180
181         if (url != NULL)
182         {
183                 curl_easy_setopt (curl, CURLOPT_URL, url);
184         }
185
186         if (cacert != NULL)
187         {
188                 curl_easy_setopt (curl, CURLOPT_CAINFO, cacert);
189         }
190
191         return (0);
192 } /* int init */
193
194 static void submit_counter (const char *type, const char *type_instance,
195                 unsigned long long value)
196 {
197         value_t values[1];
198         value_list_t vl = VALUE_LIST_INIT;
199
200         DBG ("type = %s; type_instance = %s; value = %llu;",
201                         type, type_instance, value);
202
203         values[0].counter = value;
204
205         vl.values = values;
206         vl.values_len = 1;
207         vl.time = time (NULL);
208         strcpy (vl.host, hostname);
209         strcpy (vl.plugin, "apache");
210         strcpy (vl.plugin_instance, "");
211         strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
212
213         plugin_dispatch_values (type, &vl);
214 } /* void submit_counter */
215
216 static void submit_gauge (const char *type, const char *type_instance,
217                 double value)
218 {
219         value_t values[1];
220         value_list_t vl = VALUE_LIST_INIT;
221
222         DBG ("type = %s; type_instance = %s; value = %lf;",
223                         type, type_instance, value);
224
225         values[0].gauge = value;
226
227         vl.values = values;
228         vl.values_len = 1;
229         vl.time = time (NULL);
230         strcpy (vl.host, hostname);
231         strcpy (vl.plugin, "apache");
232         strcpy (vl.plugin_instance, "");
233
234         if (type_instance != NULL)
235                 strncpy (vl.type_instance, type_instance,
236                                 sizeof (vl.type_instance));
237
238         plugin_dispatch_values (type, &vl);
239 } /* void submit_counter */
240
241 static void submit_scoreboard (char *buf)
242 {
243         /*
244          * Scoreboard Key:
245          * "_" Waiting for Connection, "S" Starting up, "R" Reading Request,
246          * "W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
247          * "C" Closing connection, "L" Logging, "G" Gracefully finishing,
248          * "I" Idle cleanup of worker, "." Open slot with no current process
249          */
250         long long open      = 0LL;
251         long long waiting   = 0LL;
252         long long starting  = 0LL;
253         long long reading   = 0LL;
254         long long sending   = 0LL;
255         long long keepalive = 0LL;
256         long long dnslookup = 0LL;
257         long long closing   = 0LL;
258         long long logging   = 0LL;
259         long long finishing = 0LL;
260         long long idle_cleanup = 0LL;
261
262         int i;
263
264         for (i = 0; buf[i] != '\0'; i++)
265         {
266                 if (buf[i] == '.') open++;
267                 else if (buf[i] == '_') waiting++;
268                 else if (buf[i] == 'S') starting++;
269                 else if (buf[i] == 'R') reading++;
270                 else if (buf[i] == 'W') sending++;
271                 else if (buf[i] == 'K') keepalive++;
272                 else if (buf[i] == 'D') dnslookup++;
273                 else if (buf[i] == 'C') closing++;
274                 else if (buf[i] == 'L') logging++;
275                 else if (buf[i] == 'G') finishing++;
276                 else if (buf[i] == 'I') idle_cleanup++;
277         }
278
279         submit_gauge ("apache_scoreboard", "open"     , open);
280         submit_gauge ("apache_scoreboard", "waiting"  , waiting);
281         submit_gauge ("apache_scoreboard", "starting" , starting);
282         submit_gauge ("apache_scoreboard", "reading"  , reading);
283         submit_gauge ("apache_scoreboard", "sending"  , sending);
284         submit_gauge ("apache_scoreboard", "keepalive", keepalive);
285         submit_gauge ("apache_scoreboard", "dnslookup", dnslookup);
286         submit_gauge ("apache_scoreboard", "closing"  , closing);
287         submit_gauge ("apache_scoreboard", "logging"  , logging);
288         submit_gauge ("apache_scoreboard", "finishing", finishing);
289         submit_gauge ("apache_scoreboard", "idle_cleanup", idle_cleanup);
290 }
291
292 static int apache_read (void)
293 {
294         int i;
295
296         char *ptr;
297         char *lines[16];
298         int   lines_num = 0;
299
300         char *fields[4];
301         int   fields_num;
302
303         if (curl == NULL)
304                 return (-1);
305         if (url == NULL)
306                 return (-1);
307
308         apache_buffer_len = 0;
309         if (curl_easy_perform (curl) != 0)
310         {
311                 syslog (LOG_ERR, "apache: curl_easy_perform failed: %s",
312                                 apache_curl_error);
313                 return (-1);
314         }
315
316         ptr = apache_buffer;
317         while ((lines[lines_num] = strtok (ptr, "\n\r")) != NULL)
318         {
319                 ptr = NULL;
320                 lines_num++;
321
322                 if (lines_num >= 16)
323                         break;
324         }
325
326         for (i = 0; i < lines_num; i++)
327         {
328                 fields_num = strsplit (lines[i], fields, 4);
329
330                 if (fields_num == 3)
331                 {
332                         if ((strcmp (fields[0], "Total") == 0)
333                                         && (strcmp (fields[1], "Accesses:") == 0))
334                                 submit_counter ("apache_requests", "",
335                                                 atoll (fields[2]));
336                         else if ((strcmp (fields[0], "Total") == 0)
337                                         && (strcmp (fields[1], "kBytes:") == 0))
338                                 submit_counter ("apache_bytes", "",
339                                                 1024LL * atoll (fields[2]));
340                 }
341                 else if (fields_num == 2)
342                 {
343                         if (strcmp (fields[0], "Scoreboard:") == 0)
344                                 submit_scoreboard (fields[1]);
345                         else if (strcmp (fields[0], "BusyServers:") == 0)
346                                 submit_gauge ("apache_connections", NULL, atol (fields[1]));
347                 }
348         }
349
350         apache_buffer_len = 0;
351
352         return (0);
353 } /* int apache_read */
354 #endif /* APACHE_HAVE_READ */
355
356 void module_register (void)
357 {
358         plugin_register_data_set (&apache_bytes_ds);
359         plugin_register_data_set (&apache_requests_ds);
360         plugin_register_data_set (&apache_scoreboard_ds);
361         plugin_register_data_set (&apache_connections_ds);
362
363 #if APACHE_HAVE_READ
364         plugin_register_config ("apache", config,
365                         config_keys, config_keys_num);
366         plugin_register_init ("apache", init);
367         plugin_register_read ("apache", apache_read);
368 #endif
369 }