1 /**
2 * collectd - src/utils_cmd_getval.c
3 * Copyright (C) 2008 Florian octo Forster
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
22 *
23 * Authors:
24 * Florian octo Forster <octo at collectd.org>
25 **/
27 #include "collectd.h"
28 #include "common.h"
29 #include "plugin.h"
31 #include "utils_cache.h"
32 #include "utils_parse_option.h"
33 #include "utils_cmd_getval.h"
35 #define print_to_socket(fh, ...) \
36 do { \
37 if (fprintf (fh, __VA_ARGS__) < 0) { \
38 char errbuf[1024]; \
39 WARNING ("handle_getval: failed to write to socket #%i: %s", \
40 fileno (fh), sstrerror (errno, errbuf, sizeof (errbuf))); \
41 return -1; \
42 } \
43 fflush(fh); \
44 } while (0)
46 int handle_getval (FILE *fh, char *buffer)
47 {
48 char *command;
49 char *identifier;
50 char *identifier_copy;
52 char *hostname;
53 char *plugin;
54 char *plugin_instance;
55 char *type;
56 char *type_instance;
57 gauge_t *values;
58 size_t values_num;
60 const data_set_t *ds;
62 int status;
63 size_t i;
65 if ((fh == NULL) || (buffer == NULL))
66 return (-1);
68 DEBUG ("utils_cmd_getval: handle_getval (fh = %p, buffer = %s);",
69 (void *) fh, buffer);
71 command = NULL;
72 status = parse_string (&buffer, &command);
73 if (status != 0)
74 {
75 print_to_socket (fh, "-1 Cannot parse command.\n");
76 return (-1);
77 }
78 assert (command != NULL);
80 if (strcasecmp ("GETVAL", command) != 0)
81 {
82 print_to_socket (fh, "-1 Unexpected command: `%s'.\n", command);
83 return (-1);
84 }
86 identifier = NULL;
87 status = parse_string (&buffer, &identifier);
88 if (status != 0)
89 {
90 print_to_socket (fh, "-1 Cannot parse identifier.\n");
91 return (-1);
92 }
93 assert (identifier != NULL);
95 if (*buffer != 0)
96 {
97 print_to_socket (fh, "-1 Garbage after end of command: %s\n", buffer);
98 return (-1);
99 }
101 /* parse_identifier() modifies its first argument,
102 * returning pointers into it */
103 identifier_copy = sstrdup (identifier);
105 status = parse_identifier (identifier_copy, &hostname,
106 &plugin, &plugin_instance,
107 &type, &type_instance);
108 if (status != 0)
109 {
110 DEBUG ("handle_getval: Cannot parse identifier `%s'.", identifier);
111 print_to_socket (fh, "-1 Cannot parse identifier `%s'.\n", identifier);
112 sfree (identifier_copy);
113 return (-1);
114 }
116 ds = plugin_get_ds (type);
117 if (ds == NULL)
118 {
119 DEBUG ("handle_getval: plugin_get_ds (%s) == NULL;", type);
120 print_to_socket (fh, "-1 Type `%s' is unknown.\n", type);
121 sfree (identifier_copy);
122 return (-1);
123 }
125 values = NULL;
126 values_num = 0;
127 status = uc_get_rate_by_name (identifier, &values, &values_num);
128 if (status != 0)
129 {
130 print_to_socket (fh, "-1 No such value\n");
131 sfree (identifier_copy);
132 return (-1);
133 }
135 if (ds->ds_num != values_num)
136 {
137 ERROR ("ds[%s]->ds_num = %zu, "
138 "but uc_get_rate_by_name returned %zu values.",
139 ds->type, ds->ds_num, values_num);
140 print_to_socket (fh, "-1 Error reading value from cache.\n");
141 sfree (values);
142 sfree (identifier_copy);
143 return (-1);
144 }
146 print_to_socket (fh, "%zu Value%s found\n", values_num,
147 (values_num == 1) ? "" : "s");
148 for (i = 0; i < values_num; i++)
149 {
150 print_to_socket (fh, "%s=", ds->ds[i].name);
151 if (isnan (values[i]))
152 {
153 print_to_socket (fh, "NaN\n");
154 }
155 else
156 {
157 print_to_socket (fh, "%12e\n", values[i]);
158 }
159 }
161 sfree (values);
162 sfree (identifier_copy);
164 return (0);
165 } /* int handle_getval */
167 /* vim: set sw=2 sts=2 ts=8 : */