2 * collection4 - action_instance_data_json.c
3 * Copyright (C) 2010 Florian octo Forster
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this program; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301 USA
21 * Florian octo Forster <ff at octo.it>
32 #include "action_instance_data_json.h"
35 #include "graph_instance.h"
36 #include "graph_list.h"
37 #include "utils_cgi.h"
40 #include <fcgi_stdio.h>
42 /* Expire data after one day. */
43 #define EXPIRES_SECS 86400
45 static void write_callback (__attribute__((unused)) void *ctx, /* {{{ */
46 const char *str, unsigned int len)
48 fwrite ((void *) str, /* size = */ len, /* nmemb = */ 1, stdout);
49 } /* }}} void write_callback */
51 int action_instance_data_json (void) /* {{{ */
54 graph_instance_t *inst;
60 dp_time_t dp_begin = { 0, 0 };
61 dp_time_t dp_end = { 0, 0 };
63 yajl_gen_config handler_config;
67 char time_buffer[128];
70 cfg = gl_graph_get_selected ();
74 inst = inst_get_selected (cfg);
78 /* Get selected time(s) */
79 tt_begin = tt_end = tt_now = 0;
80 status = get_time_args (&tt_begin, &tt_end, &tt_now);
84 dp_begin.tv_sec = tt_begin;
86 dp_end.tv_sec = tt_end;
89 memset (&handler_config, 0, sizeof (handler_config));
90 handler_config.beautify = 0;
91 handler_config.indentString = " ";
93 handler = yajl_gen_alloc2 (write_callback,
95 /* alloc functions = */ NULL,
96 /* context = */ NULL);
100 printf ("Content-Type: application/json\n");
102 /* By default, permit caching until 1/1000th after the last data. If that
103 * data is in the past, assume the entire data is in the past and allow
104 * caching for one day. */
105 expires = tt_end + ((tt_end - tt_begin) / 1000);
106 if (expires < tt_now)
107 expires = tt_now + 86400;
109 status = time_to_rfc1123 (expires, time_buffer, sizeof (time_buffer));
111 printf ("Expires: %s\n"
112 "Cache-Control: public\n",
116 status = inst_data_to_json (inst,
117 dp_begin, dp_end, handler);
119 yajl_gen_free (handler);
122 } /* }}} int action_instance_data_json */
124 /* vim: set sw=2 sts=2 et fdm=marker : */