9de66df33173c207910bc360d2987ef80735f57e
1 /**
2 * collectd - src/utils_cms_getval.c
3 * Copyright (C) 2008 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 * Author:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
26 #include "utils_cache.h"
27 #include "utils_parse_option.h"
29 #define print_to_socket(fh, ...) \
30 if (fprintf (fh, __VA_ARGS__) < 0) { \
31 char errbuf[1024]; \
32 WARNING ("handle_getval: failed to write to socket #%i: %s", \
33 fileno (fh), sstrerror (errno, errbuf, sizeof (errbuf))); \
34 return -1; \
35 } \
36 fflush(fh);
38 int handle_getval (FILE *fh, char *buffer)
39 {
40 char *command;
41 char *identifier;
42 char *identifier_copy;
44 char *hostname;
45 char *plugin;
46 char *plugin_instance;
47 char *type;
48 char *type_instance;
49 gauge_t *values;
50 size_t values_num;
52 const data_set_t *ds;
54 int status;
55 size_t i;
57 if ((fh == NULL) || (buffer == NULL))
58 return (-1);
60 DEBUG ("utils_cmd_getval: handle_getval (fh = %p, buffer = %s);",
61 (void *) fh, buffer);
63 command = NULL;
64 status = parse_string (&buffer, &command);
65 if (status != 0)
66 {
67 print_to_socket (fh, "-1 Cannot parse command.\n");
68 return (-1);
69 }
70 assert (command != NULL);
72 if (strcasecmp ("GETVAL", command) != 0)
73 {
74 print_to_socket (fh, "-1 Unexpected command: `%s'.\n", command);
75 return (-1);
76 }
78 identifier = NULL;
79 status = parse_string (&buffer, &identifier);
80 if (status != 0)
81 {
82 print_to_socket (fh, "-1 Cannot parse identifier.\n");
83 return (-1);
84 }
85 assert (identifier != NULL);
87 if (*buffer != 0)
88 {
89 print_to_socket (fh, "-1 Garbage after end of command: %s\n", buffer);
90 return (-1);
91 }
93 /* parse_identifier() modifies its first argument,
94 * returning pointers into it */
95 identifier_copy = sstrdup (identifier);
97 status = parse_identifier (identifier_copy, &hostname,
98 &plugin, &plugin_instance,
99 &type, &type_instance);
100 if (status != 0)
101 {
102 DEBUG ("handle_getval: Cannot parse identifier `%s'.", identifier);
103 print_to_socket (fh, "-1 Cannot parse identifier `%s'.\n", identifier);
104 sfree (identifier_copy);
105 return (-1);
106 }
108 ds = plugin_get_ds (type);
109 if (ds == NULL)
110 {
111 DEBUG ("handle_getval: plugin_get_ds (%s) == NULL;", type);
112 print_to_socket (fh, "-1 Type `%s' is unknown.\n", type);
113 sfree (identifier_copy);
114 return (-1);
115 }
117 values = NULL;
118 values_num = 0;
119 status = uc_get_rate_by_name (identifier, &values, &values_num);
120 if (status != 0)
121 {
122 print_to_socket (fh, "-1 No such value\n");
123 sfree (identifier_copy);
124 return (-1);
125 }
127 if ((size_t) ds->ds_num != values_num)
128 {
129 ERROR ("ds[%s]->ds_num = %i, "
130 "but uc_get_rate_by_name returned %u values.",
131 ds->type, ds->ds_num, (unsigned int) values_num);
132 print_to_socket (fh, "-1 Error reading value from cache.\n");
133 sfree (values);
134 sfree (identifier_copy);
135 return (-1);
136 }
138 print_to_socket (fh, "%u Value%s found\n", (unsigned int) values_num,
139 (values_num == 1) ? "" : "s");
140 for (i = 0; i < values_num; i++)
141 {
142 print_to_socket (fh, "%s=", ds->ds[i].name);
143 if (isnan (values[i]))
144 {
145 print_to_socket (fh, "NaN\n");
146 }
147 else
148 {
149 print_to_socket (fh, "%12e\n", values[i]);
150 }
151 }
153 sfree (values);
154 sfree (identifier_copy);
156 return (0);
157 } /* int handle_getval */
159 /* vim: set sw=2 sts=2 ts=8 : */