1 /**
2 * collectd - src/csv.c
3 * Copyright (C) 2007 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; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "plugin.h"
24 #include "common.h"
26 /*
27 * Private variables
28 */
29 static const char *config_keys[] =
30 {
31 "DataDir"
32 };
33 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
35 static char *datadir = NULL;
37 static int value_list_to_string (char *buffer, int buffer_len,
38 const data_set_t *ds, const value_list_t *vl)
39 {
40 int offset;
41 int status;
42 int i;
44 memset (buffer, '\0', buffer_len);
46 status = snprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
47 if ((status < 1) || (status >= buffer_len))
48 return (-1);
49 offset = status;
51 for (i = 0; i < ds->ds_num; i++)
52 {
53 if ((ds->ds[i].type != DS_TYPE_COUNTER)
54 && (ds->ds[i].type != DS_TYPE_GAUGE))
55 return (-1);
57 if (ds->ds[i].type == DS_TYPE_COUNTER)
58 status = snprintf (buffer + offset, buffer_len - offset,
59 ",%llu", vl->values[i].counter);
60 else
61 status = snprintf (buffer + offset, buffer_len - offset,
62 ",%lf", vl->values[i].gauge);
64 if ((status < 1) || (status >= (buffer_len - offset)))
65 return (-1);
67 offset += status;
68 } /* for ds->ds_num */
70 return (0);
71 } /* int value_list_to_string */
73 static int value_list_to_filename (char *buffer, int buffer_len,
74 const data_set_t *ds, const value_list_t *vl)
75 {
76 int offset = 0;
77 int status;
79 if (datadir != NULL)
80 {
81 status = snprintf (buffer + offset, buffer_len - offset,
82 "%s/", datadir);
83 if ((status < 1) || (status >= buffer_len - offset))
84 return (-1);
85 offset += status;
86 }
88 status = snprintf (buffer + offset, buffer_len - offset,
89 "%s/", vl->host);
90 if ((status < 1) || (status >= buffer_len - offset))
91 return (-1);
92 offset += status;
94 if (strlen (vl->plugin_instance) > 0)
95 status = snprintf (buffer + offset, buffer_len - offset,
96 "%s-%s/", vl->plugin, vl->plugin_instance);
97 else
98 status = snprintf (buffer + offset, buffer_len - offset,
99 "%s/", vl->plugin);
100 if ((status < 1) || (status >= buffer_len - offset))
101 return (-1);
102 offset += status;
104 if (strlen (vl->type_instance) > 0)
105 status = snprintf (buffer + offset, buffer_len - offset,
106 "%s-%s", ds->type, vl->type_instance);
107 else
108 status = snprintf (buffer + offset, buffer_len - offset,
109 "%s", ds->type);
110 if ((status < 1) || (status >= buffer_len - offset))
111 return (-1);
112 offset += status;
114 {
115 time_t now;
116 struct tm stm;
118 /* TODO: Find a way to minimize the calls to `localtime_r',
119 * since they are pretty expensive.. */
120 now = time (NULL);
121 if (localtime_r (&now, &stm) == NULL)
122 {
123 ERROR ("csv plugin: localtime_r failed");
124 return (1);
125 }
127 strftime (buffer + offset, buffer_len - offset,
128 "-%Y-%m-%d", &stm);
129 }
131 return (0);
132 } /* int value_list_to_filename */
134 static int csv_create_file (const char *filename, const data_set_t *ds)
135 {
136 FILE *csv;
137 int i;
139 if (check_create_dir (filename))
140 return (-1);
142 csv = fopen (filename, "w");
143 if (csv == NULL)
144 {
145 char errbuf[1024];
146 ERROR ("csv plugin: fopen (%s) failed: %s",
147 filename,
148 sstrerror (errno, errbuf, sizeof (errbuf)));
149 return (-1);
150 }
152 fprintf (csv, "epoch");
153 for (i = 0; i < ds->ds_num; i++)
154 fprintf (csv, ",%s", ds->ds[i].name);
156 fprintf (csv, "\n");
157 fclose (csv);
159 return 0;
160 } /* int csv_create_file */
162 static int csv_config (const char *key, const char *value)
163 {
164 if (strcasecmp ("DataDir", key) == 0)
165 {
166 if (datadir != NULL)
167 free (datadir);
168 datadir = strdup (value);
169 if (datadir != NULL)
170 {
171 int len = strlen (datadir);
172 while ((len > 0) && (datadir[len - 1] == '/'))
173 {
174 len--;
175 datadir[len] = '\0';
176 }
177 if (len <= 0)
178 {
179 free (datadir);
180 datadir = NULL;
181 }
182 }
183 }
184 else
185 {
186 return (-1);
187 }
188 return (0);
189 } /* int csv_config */
191 static int csv_write (const data_set_t *ds, const value_list_t *vl)
192 {
193 struct stat statbuf;
194 char filename[512];
195 char values[512];
196 FILE *csv;
197 int csv_fd;
198 struct flock fl;
199 int status;
201 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
202 return (-1);
204 DEBUG ("csv plugin: csv_write: filename = %s;", filename);
206 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
207 return (-1);
209 if (stat (filename, &statbuf) == -1)
210 {
211 if (errno == ENOENT)
212 {
213 if (csv_create_file (filename, ds))
214 return (-1);
215 }
216 else
217 {
218 char errbuf[1024];
219 ERROR ("stat(%s) failed: %s", filename,
220 sstrerror (errno, errbuf,
221 sizeof (errbuf)));
222 return (-1);
223 }
224 }
225 else if (!S_ISREG (statbuf.st_mode))
226 {
227 ERROR ("stat(%s): Not a regular file!",
228 filename);
229 return (-1);
230 }
232 csv = fopen (filename, "a");
233 if (csv == NULL)
234 {
235 char errbuf[1024];
236 ERROR ("csv plugin: fopen (%s) failed: %s", filename,
237 sstrerror (errno, errbuf, sizeof (errbuf)));
238 return (-1);
239 }
240 csv_fd = fileno (csv);
242 memset (&fl, '\0', sizeof (fl));
243 fl.l_start = 0;
244 fl.l_len = 0; /* till end of file */
245 fl.l_pid = getpid ();
246 fl.l_type = F_WRLCK;
247 fl.l_whence = SEEK_SET;
249 status = fcntl (csv_fd, F_SETLK, &fl);
250 if (status != 0)
251 {
252 char errbuf[1024];
253 ERROR ("csv plugin: flock (%s) failed: %s", filename,
254 sstrerror (errno, errbuf, sizeof (errbuf)));
255 fclose (csv);
256 return (-1);
257 }
259 fprintf (csv, "%s\n", values);
261 /* The lock is implicitely released. I we don't release it explicitely
262 * because the `FILE *' may need to flush a cache first */
263 fclose (csv);
265 return (0);
266 } /* int csv_write */
268 void module_register (void)
269 {
270 plugin_register_config ("csv", csv_config,
271 config_keys, config_keys_num);
272 plugin_register_write ("csv", csv_write);
273 } /* void module_register */