Implemented the dynamic heartbeat for the apache plugin (it was added after the branc...
[collectd.git] / src / apache.c
1 /**
2  * collectd - src/apache.c
3  * Copyright (C) 2006  Florian octo Forster
4  *
5  * This program is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License as published by the
7  * Free Software Foundation; either version 2 of the License, or (at your
8  * option) any later version.
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  **/
22
23 #include "collectd.h"
24 #include "common.h"
25 #include "plugin.h"
26 #include "configfile.h"
27
28 #define MODULE_NAME "apache"
29
30 #if HAVE_LIBCURL && HAVE_CURL_CURL_H
31 #  define APACHE_HAVE_READ 1
32 #  include <curl/curl.h>
33 #else
34 #  define APACHE_HAVE_READ 0
35 #endif
36
37 static char *url  = NULL;
38 static char *user = NULL;
39 static char *pass = NULL;
40
41 #if APACHE_HAVE_READ
42 static CURL *curl = NULL;
43
44 static char apache_buffer[4096];
45 static int  apache_buffer_len = 0;
46 static char apache_curl_error[CURL_ERROR_SIZE];
47 #endif
48
49 static char *bytes_file = "apache/apache_bytes.rrd";
50 static char *bytes_ds_def[] =
51 {
52         "DS:count:COUNTER:"COLLECTD_HEARTBEAT":0:U",
53         NULL
54 };
55 static int bytes_ds_num = 1;
56
57 static char *requests_file = "apache/apache_requests.rrd";
58 static char *requests_ds_def[] =
59 {
60         "DS:count:COUNTER:"COLLECTD_HEARTBEAT":0:U",
61         NULL
62 };
63 static int requests_ds_num = 1;
64
65 static char *scoreboard_file = "apache/apache_scoreboard-%s.rrd";
66 static char *scoreboard_ds_def[] =
67 {
68         "DS:count:GAUGE:"COLLECTD_HEARTBEAT":0:U",
69         NULL
70 };
71 static int scoreboard_ds_num = 1;
72
73 static char *config_keys[] =
74 {
75         "URL",
76         "User",
77         "Password",
78         NULL
79 };
80 static int config_keys_num = 3;
81
82
83 static size_t apache_curl_callback (void *buf, size_t size, size_t nmemb, void *stream)
84 {
85         size_t len = size * nmemb;
86
87         if ((apache_buffer_len + len) >= 4096)
88         {
89                 len = 4095 - apache_buffer_len;
90         }
91
92         if (len <= 0)
93                 return (len);
94
95         memcpy (apache_buffer + apache_buffer_len, (char *) buf, len);
96         apache_buffer_len += len;
97         apache_buffer[apache_buffer_len] = '\0';
98
99         return (len);
100 }
101
102 static int config_set (char **var, char *value)
103 {
104         if (*var != NULL)
105         {
106                 free (*var);
107                 *var = NULL;
108         }
109
110         if ((*var = strdup (value)) == NULL)
111                 return (1);
112         else
113                 return (0);
114 }
115
116 static int config (char *key, char *value)
117 {
118         if (strcasecmp (key, "url") == 0)
119                 return (config_set (&url, value));
120         else if (strcasecmp (key, "user") == 0)
121                 return (config_set (&user, value));
122         else if (strcasecmp (key, "password") == 0)
123                 return (config_set (&pass, value));
124         else
125                 return (-1);
126 }
127
128 static void init (void)
129 {
130 #if APACHE_HAVE_READ
131         static char credentials[1024];
132
133         if (curl != NULL)
134         {
135                 curl_easy_cleanup (curl);
136         }
137
138         if ((curl = curl_easy_init ()) == NULL)
139         {
140                 syslog (LOG_ERR, "apache: `curl_easy_init' failed.");
141                 return;
142         }
143
144         curl_easy_setopt (curl, CURLOPT_WRITEFUNCTION, apache_curl_callback);
145         curl_easy_setopt (curl, CURLOPT_USERAGENT, PACKAGE_NAME"/"PACKAGE_VERSION);
146         curl_easy_setopt (curl, CURLOPT_ERRORBUFFER, apache_curl_error);
147
148         if (user != NULL)
149         {
150                 if (snprintf (credentials, 1024, "%s:%s", user, pass == NULL ? "" : pass) >= 1024)
151                 {
152                         syslog (LOG_ERR, "apache: Credentials would have been truncated.");
153                         return;
154                 }
155
156                 curl_easy_setopt (curl, CURLOPT_USERPWD, credentials);
157         }
158
159         if (url != NULL)
160         {
161                 curl_easy_setopt (curl, CURLOPT_URL, url);
162         }
163 #endif /* APACHE_HAVE_READ */
164 }
165
166 static void bytes_write (char *host, char *inst, char *val)
167 {
168         rrd_update_file (host, bytes_file, val, bytes_ds_def, bytes_ds_num);
169 }
170
171 static void requests_write (char *host, char *inst, char *val)
172 {
173         rrd_update_file (host, requests_file, val, requests_ds_def, requests_ds_num);
174 }
175
176 static void scoreboard_write (char *host, char *inst, char *val)
177 {
178         char buf[1024];
179
180         if (snprintf (buf, 1024, scoreboard_file, inst) >= 1024)
181                 return;
182
183         rrd_update_file (host, buf, val, scoreboard_ds_def, scoreboard_ds_num);
184 }
185
186 #if APACHE_HAVE_READ
187 static void submit (char *type, char *inst, long long value)
188 {
189         char buf[1024];
190         int  status;
191
192         status = snprintf (buf, 1024, "%u:%lli", (unsigned int) curtime, value);
193         if (status < 0)
194         {
195                 syslog (LOG_ERR, "apache: bytes_submit: snprintf failed");
196                 return;
197         }
198         else if (status >= 1024)
199         {
200                 syslog (LOG_WARNING, "apache: bytes_submit: snprintf was truncated");
201                 return;
202         }
203
204         plugin_submit (type, inst, buf);
205 }
206
207 static void submit_scoreboard (char *buf)
208 {
209         /*
210          * Scoreboard Key:
211          * "_" Waiting for Connection, "S" Starting up, "R" Reading Request,
212          * "W" Sending Reply, "K" Keepalive (read), "D" DNS Lookup,
213          * "C" Closing connection, "L" Logging, "G" Gracefully finishing,
214          * "I" Idle cleanup of worker, "." Open slot with no current process
215          */
216         long long open      = 0LL;
217         long long waiting   = 0LL;
218         long long starting  = 0LL;
219         long long reading   = 0LL;
220         long long sending   = 0LL;
221         long long keepalive = 0LL;
222         long long dnslookup = 0LL;
223         long long closing   = 0LL;
224         long long logging   = 0LL;
225         long long finishing = 0LL;
226         long long idle_cleanup = 0LL;
227
228         int i;
229
230         for (i = 0; buf[i] != '\0'; i++)
231         {
232                 if (buf[i] == '.') open++;
233                 else if (buf[i] == '_') waiting++;
234                 else if (buf[i] == 'S') starting++;
235                 else if (buf[i] == 'R') reading++;
236                 else if (buf[i] == 'W') sending++;
237                 else if (buf[i] == 'K') keepalive++;
238                 else if (buf[i] == 'D') dnslookup++;
239                 else if (buf[i] == 'C') closing++;
240                 else if (buf[i] == 'L') logging++;
241                 else if (buf[i] == 'G') finishing++;
242                 else if (buf[i] == 'I') idle_cleanup++;
243         }
244
245         submit ("apache_scoreboard", "open"     , open);
246         submit ("apache_scoreboard", "waiting"  , waiting);
247         submit ("apache_scoreboard", "starting" , starting);
248         submit ("apache_scoreboard", "reading"  , reading);
249         submit ("apache_scoreboard", "sending"  , sending);
250         submit ("apache_scoreboard", "keepalive", keepalive);
251         submit ("apache_scoreboard", "dnslookup", dnslookup);
252         submit ("apache_scoreboard", "closing"  , closing);
253         submit ("apache_scoreboard", "logging"  , logging);
254         submit ("apache_scoreboard", "finishing", finishing);
255         submit ("apache_scoreboard", "idle_cleanup", idle_cleanup);
256 }
257
258 static void apache_read (void)
259 {
260         int i;
261
262         char *ptr;
263         char *lines[16];
264         int   lines_num = 0;
265
266         char *fields[4];
267         int   fields_num;
268
269         if (curl == NULL)
270                 return;
271         if (url == NULL)
272                 return;
273
274         if (curl_easy_perform (curl) != 0)
275         {
276                 syslog (LOG_WARNING, "apache: curl_easy_perform failed: %s", apache_curl_error);
277                 return;
278         }
279
280         ptr = apache_buffer;
281         while ((lines[lines_num] = strtok (ptr, "\n\r")) != NULL)
282         {
283                 ptr = NULL;
284                 lines_num++;
285
286                 if (lines_num >= 16)
287                         break;
288         }
289
290         for (i = 0; i < lines_num; i++)
291         {
292                 fields_num = strsplit (lines[i], fields, 4);
293
294                 if (fields_num == 3)
295                 {
296                         if ((strcmp (fields[0], "Total") == 0)
297                                         && (strcmp (fields[1], "Accesses:") == 0))
298                                 submit ("apache_requests", NULL, atoll (fields[2]));
299                         else if ((strcmp (fields[0], "Total") == 0)
300                                         && (strcmp (fields[1], "kBytes:") == 0))
301                                 submit ("apache_bytes", NULL, 1024LL * atoll (fields[2]));
302                 }
303                 else if (fields_num == 2)
304                 {
305                         if (strcmp (fields[0], "Scoreboard:") == 0)
306                                 submit_scoreboard (fields[1]);
307                 }
308         }
309
310         apache_buffer_len = 0;
311 }
312 #else
313 #  define apache_read NULL
314 #endif /* APACHE_HAVE_READ */
315
316 void module_register (void)
317 {
318         plugin_register (MODULE_NAME, init, apache_read, NULL);
319         plugin_register ("apache_requests",   NULL, NULL, requests_write);
320         plugin_register ("apache_bytes",      NULL, NULL, bytes_write);
321         plugin_register ("apache_scoreboard", NULL, NULL, scoreboard_write);
322         cf_register (MODULE_NAME, config, config_keys, config_keys_num);
323 }
324
325 #undef MODULE_NAME