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"
25 #include "utils_debug.h"
27 /*
28 * Private variables
29 */
30 static const char *config_keys[] =
31 {
32 "DataDir"
33 };
34 static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
36 static char *datadir = NULL;
38 static int value_list_to_string (char *buffer, int buffer_len,
39 const data_set_t *ds, const value_list_t *vl)
40 {
41 int offset;
42 int status;
43 int i;
45 memset (buffer, '\0', sizeof (buffer_len));
47 status = snprintf (buffer, buffer_len, "%u", (unsigned int) vl->time);
48 if ((status < 1) || (status >= buffer_len))
49 return (-1);
50 offset = status;
52 for (i = 0; i < ds->ds_num; i++)
53 {
54 if ((ds->ds[i].type != DS_TYPE_COUNTER)
55 && (ds->ds[i].type != DS_TYPE_GAUGE))
56 return (-1);
58 if (ds->ds[i].type == DS_TYPE_COUNTER)
59 status = snprintf (buffer + offset, buffer_len - offset,
60 ",%llu", vl->values[i].counter);
61 else
62 status = snprintf (buffer + offset, buffer_len - offset,
63 ",%lf", vl->values[i].gauge);
65 if ((status < 1) || (status >= (buffer_len - offset)))
66 return (-1);
68 offset += status;
69 } /* for ds->ds_num */
71 return (0);
72 } /* int value_list_to_string */
74 static int value_list_to_filename (char *buffer, int buffer_len,
75 const data_set_t *ds, const value_list_t *vl)
76 {
77 int offset = 0;
78 int status;
80 if (datadir != NULL)
81 {
82 status = snprintf (buffer + offset, buffer_len - offset,
83 "%s/", datadir);
84 if ((status < 1) || (status >= buffer_len - offset))
85 return (-1);
86 offset += status;
87 }
89 status = snprintf (buffer + offset, buffer_len - offset,
90 "%s/", vl->host);
91 if ((status < 1) || (status >= buffer_len - offset))
92 return (-1);
93 offset += status;
95 if (strlen (vl->plugin_instance) > 0)
96 status = snprintf (buffer + offset, buffer_len - offset,
97 "%s-%s/", vl->plugin, vl->plugin_instance);
98 else
99 status = snprintf (buffer + offset, buffer_len - offset,
100 "%s/", vl->plugin);
101 if ((status < 1) || (status >= buffer_len - offset))
102 return (-1);
103 offset += status;
105 if (strlen (vl->type_instance) > 0)
106 status = snprintf (buffer + offset, buffer_len - offset,
107 "%s-%s", ds->type, vl->type_instance);
108 else
109 status = snprintf (buffer + offset, buffer_len - offset,
110 "%s", ds->type);
111 if ((status < 1) || (status >= buffer_len - offset))
112 return (-1);
113 offset += status;
115 {
116 time_t now;
117 struct tm stm;
119 /* TODO: Find a way to minimize the calls to `localtime_r',
120 * since they are pretty expensive.. */
121 now = time (NULL);
122 if (localtime_r (&now, &stm) == NULL)
123 {
124 syslog (LOG_ERR, "csv plugin: localtime_r failed");
125 return (1);
126 }
128 strftime (buffer + offset, buffer_len - offset,
129 "-%Y-%m-%d", &stm);
130 }
132 return (0);
133 } /* int value_list_to_filename */
135 static int csv_create_file (const char *filename, const data_set_t *ds)
136 {
137 FILE *csv;
138 int i;
140 if (check_create_dir (filename))
141 return (-1);
143 csv = fopen (filename, "w");
144 if (csv == NULL)
145 {
146 syslog (LOG_ERR, "csv plugin: fopen (%s) failed: %s",
147 filename, strerror(errno));
148 return (-1);
149 }
151 fprintf (csv, "epoch");
152 for (i = 0; i < ds->ds_num; i++)
153 fprintf (csv, ",%s", ds->ds[i].name);
155 fprintf (csv, "\n");
156 fclose (csv);
158 return 0;
159 } /* int csv_create_file */
161 static int csv_config (const char *key, const char *value)
162 {
163 if (strcasecmp ("DataDir", key) == 0)
164 {
165 if (datadir != NULL)
166 free (datadir);
167 datadir = strdup (value);
168 if (datadir != NULL)
169 {
170 int len = strlen (datadir);
171 while ((len > 0) && (datadir[len - 1] == '/'))
172 {
173 len--;
174 datadir[len] = '\0';
175 }
176 if (len <= 0)
177 {
178 free (datadir);
179 datadir = NULL;
180 }
181 }
182 }
183 else
184 {
185 return (-1);
186 }
187 return (0);
188 } /* int csv_config */
190 static int csv_write (const data_set_t *ds, const value_list_t *vl)
191 {
192 struct stat statbuf;
193 char filename[512];
194 char values[512];
195 FILE *csv;
196 int csv_fd;
197 struct flock fl;
198 int status;
200 if (value_list_to_filename (filename, sizeof (filename), ds, vl) != 0)
201 return (-1);
203 DBG ("filename = %s;", filename);
205 if (value_list_to_string (values, sizeof (values), ds, vl) != 0)
206 return (-1);
208 if (stat (filename, &statbuf) == -1)
209 {
210 if (errno == ENOENT)
211 {
212 if (csv_create_file (filename, ds))
213 return (-1);
214 }
215 else
216 {
217 syslog (LOG_ERR, "stat(%s) failed: %s",
218 filename, strerror (errno));
219 return (-1);
220 }
221 }
222 else if (!S_ISREG (statbuf.st_mode))
223 {
224 syslog (LOG_ERR, "stat(%s): Not a regular file!",
225 filename);
226 return (-1);
227 }
229 csv = fopen (filename, "a");
230 if (csv == NULL)
231 {
232 syslog (LOG_ERR, "csv plugin: fopen (%s) failed: %s",
233 filename, strerror (errno));
234 return (-1);
235 }
236 csv_fd = fileno (csv);
238 memset (&fl, '\0', sizeof (fl));
239 fl.l_start = 0;
240 fl.l_len = 0; /* till end of file */
241 fl.l_pid = getpid ();
242 fl.l_type = F_WRLCK;
243 fl.l_whence = SEEK_SET;
245 status = fcntl (csv_fd, F_SETLK, &fl);
246 if (status != 0)
247 {
248 syslog (LOG_ERR, "csv plugin: flock (%s) failed: %s",
249 filename, strerror (errno));
250 fclose (csv);
251 return (-1);
252 }
254 fprintf (csv, "%s\n", values);
256 /* The lock is implicitely released. I we don't release it explicitely
257 * because the `FILE *' may need to flush a cache first */
258 fclose (csv);
260 return (0);
261 } /* int csv_write */
263 void module_register (void)
264 {
265 plugin_register_config ("csv", csv_config,
266 config_keys, config_keys_num);
267 plugin_register_write ("csv", csv_write);
268 }