1 /**
2 * collectd - src/utils_format_graphite.c
3 * Copyright (C) 2012 Thomas Meson
4 * Copyright (C) 2012 Florian octo Forster
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 * Thomas Meson <zllak at hycik.org>
21 * Florian octo Forster <octo at collectd.org>
22 **/
24 #include "collectd.h"
25 #include "plugin.h"
26 #include "common.h"
28 #include "utils_format_graphite.h"
29 #include "utils_cache.h"
31 #define GRAPHITE_FORBIDDEN " \t\"\\:!/()\n\r"
33 /* Utils functions to format data sets in graphite format.
34 * Largely taken from write_graphite.c as it remains the same formatting */
36 static int gr_format_values (char *ret, size_t ret_len,
37 int ds_num, const data_set_t *ds, const value_list_t *vl,
38 gauge_t const *rates)
39 {
40 size_t offset = 0;
41 int status;
43 assert (0 == strcmp (ds->type, vl->type));
45 memset (ret, 0, ret_len);
47 #define BUFFER_ADD(...) do { \
48 status = ssnprintf (ret + offset, ret_len - offset, \
49 __VA_ARGS__); \
50 if (status < 1) \
51 { \
52 return (-1); \
53 } \
54 else if (((size_t) status) >= (ret_len - offset)) \
55 { \
56 return (-1); \
57 } \
58 else \
59 offset += ((size_t) status); \
60 } while (0)
62 if (ds->ds[ds_num].type == DS_TYPE_GAUGE)
63 BUFFER_ADD (GAUGE_FORMAT, vl->values[ds_num].gauge);
64 else if (rates != NULL)
65 BUFFER_ADD ("%f", rates[ds_num]);
66 else if (ds->ds[ds_num].type == DS_TYPE_COUNTER)
67 BUFFER_ADD ("%llu", vl->values[ds_num].counter);
68 else if (ds->ds[ds_num].type == DS_TYPE_DERIVE)
69 BUFFER_ADD ("%"PRIi64, vl->values[ds_num].derive);
70 else if (ds->ds[ds_num].type == DS_TYPE_ABSOLUTE)
71 BUFFER_ADD ("%"PRIu64, vl->values[ds_num].absolute);
72 else
73 {
74 ERROR ("gr_format_values plugin: Unknown data source type: %i",
75 ds->ds[ds_num].type);
76 return (-1);
77 }
79 #undef BUFFER_ADD
81 return (0);
82 }
84 static void gr_copy_escape_part (char *dst, const char *src, size_t dst_len,
85 char escape_char)
86 {
87 size_t i;
89 memset (dst, 0, dst_len);
91 if (src == NULL)
92 return;
94 for (i = 0; i < dst_len; i++)
95 {
96 if (src[i] == 0)
97 {
98 dst[i] = 0;
99 break;
100 }
102 if ((src[i] == '.')
103 || isspace ((int) src[i])
104 || iscntrl ((int) src[i]))
105 dst[i] = escape_char;
106 else
107 dst[i] = src[i];
108 }
109 }
111 static int gr_format_name (char *ret, int ret_len,
112 value_list_t const *vl,
113 char const *ds_name,
114 char const *prefix,
115 char const *postfix,
116 char const escape_char,
117 unsigned int flags)
118 {
119 char n_host[DATA_MAX_NAME_LEN];
120 char n_plugin[DATA_MAX_NAME_LEN];
121 char n_plugin_instance[DATA_MAX_NAME_LEN];
122 char n_type[DATA_MAX_NAME_LEN];
123 char n_type_instance[DATA_MAX_NAME_LEN];
125 char tmp_plugin[2 * DATA_MAX_NAME_LEN + 1];
126 char tmp_type[2 * DATA_MAX_NAME_LEN + 1];
128 if (prefix == NULL)
129 prefix = "";
131 if (postfix == NULL)
132 postfix = "";
134 gr_copy_escape_part (n_host, vl->host,
135 sizeof (n_host), escape_char);
136 gr_copy_escape_part (n_plugin, vl->plugin,
137 sizeof (n_plugin), escape_char);
138 gr_copy_escape_part (n_plugin_instance, vl->plugin_instance,
139 sizeof (n_plugin_instance), escape_char);
140 gr_copy_escape_part (n_type, vl->type,
141 sizeof (n_type), escape_char);
142 gr_copy_escape_part (n_type_instance, vl->type_instance,
143 sizeof (n_type_instance), escape_char);
145 if (n_plugin_instance[0] != '\0')
146 ssnprintf (tmp_plugin, sizeof (tmp_plugin), "%s%c%s",
147 n_plugin,
148 (flags & GRAPHITE_SEPARATE_INSTANCES) ? '.' : '-',
149 n_plugin_instance);
150 else
151 sstrncpy (tmp_plugin, n_plugin, sizeof (tmp_plugin));
153 if (n_type_instance[0] != '\0')
154 ssnprintf (tmp_type, sizeof (tmp_type), "%s%c%s",
155 n_type,
156 (flags & GRAPHITE_SEPARATE_INSTANCES) ? '.' : '-',
157 n_type_instance);
158 else
159 sstrncpy (tmp_type, n_type, sizeof (tmp_type));
161 /* Assert always_append_ds -> ds_name */
162 assert (!(flags & GRAPHITE_ALWAYS_APPEND_DS) || (ds_name != NULL));
163 if (ds_name != NULL)
164 ssnprintf (ret, ret_len, "%s%s%s.%s.%s.%s",
165 prefix, n_host, postfix, tmp_plugin, tmp_type, ds_name);
166 else
167 ssnprintf (ret, ret_len, "%s%s%s.%s.%s",
168 prefix, n_host, postfix, tmp_plugin, tmp_type);
170 return (0);
171 }
173 static void escape_graphite_string (char *buffer, char escape_char)
174 {
175 char *head;
177 assert (strchr(GRAPHITE_FORBIDDEN, escape_char) == NULL);
179 for (head = buffer + strcspn(buffer, GRAPHITE_FORBIDDEN);
180 *head != '\0';
181 head += strcspn(head, GRAPHITE_FORBIDDEN))
182 *head = escape_char;
183 }
185 int format_graphite (char *buffer, size_t buffer_size,
186 data_set_t const *ds, value_list_t const *vl,
187 char const *prefix, char const *postfix, char const escape_char,
188 unsigned int flags)
189 {
190 int status = 0;
191 size_t i;
192 int buffer_pos = 0;
194 gauge_t *rates = NULL;
195 if (flags & GRAPHITE_STORE_RATES)
196 rates = uc_get_rate (ds, vl);
198 for (i = 0; i < ds->ds_num; i++)
199 {
200 char const *ds_name = NULL;
201 char key[10*DATA_MAX_NAME_LEN];
202 char values[512];
203 size_t message_len;
204 char message[1024];
206 if ((flags & GRAPHITE_ALWAYS_APPEND_DS)
207 || (ds->ds_num > 1))
208 ds_name = ds->ds[i].name;
210 /* Copy the identifier to `key' and escape it. */
211 status = gr_format_name (key, sizeof (key), vl, ds_name,
212 prefix, postfix, escape_char, flags);
213 if (status != 0)
214 {
215 ERROR ("format_graphite: error with gr_format_name");
216 sfree (rates);
217 return (status);
218 }
220 escape_graphite_string (key, escape_char);
221 /* Convert the values to an ASCII representation and put that into
222 * `values'. */
223 status = gr_format_values (values, sizeof (values), i, ds, vl, rates);
224 if (status != 0)
225 {
226 ERROR ("format_graphite: error with gr_format_values");
227 sfree (rates);
228 return (status);
229 }
231 /* Compute the graphite command */
232 message_len = (size_t) ssnprintf (message, sizeof (message),
233 "%s %s %u\r\n",
234 key,
235 values,
236 (unsigned int) CDTIME_T_TO_TIME_T (vl->time));
237 if (message_len >= sizeof (message)) {
238 ERROR ("format_graphite: message buffer too small: "
239 "Need %zu bytes.", message_len + 1);
240 sfree (rates);
241 return (-ENOMEM);
242 }
244 /* Append it in case we got multiple data set */
245 if ((buffer_pos + message_len) >= buffer_size)
246 {
247 ERROR ("format_graphite: target buffer too small");
248 sfree (rates);
249 return (-ENOMEM);
250 }
251 memcpy((void *) (buffer + buffer_pos), message, message_len);
252 buffer_pos += message_len;
253 }
254 sfree (rates);
255 return (status);
256 } /* int format_graphite */
258 /* vim: set sw=2 sts=2 et fdm=marker : */