graph_data_json action: Implemented action to query graph data via JSON.

diff --git a/src/Makefile.am b/src/Makefile.am
index 2923d04..96bbae7 100644 (file)
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -16,6 +16,7 @@ bin_PROGRAMS = collection.fcgi
 collection_fcgi_SOURCES = main.c \
                          oconfig.c oconfig.h aux_types.h scanner.l parser.y \
                          action_graph.c action_graph.h \
 collection_fcgi_SOURCES = main.c \
                          oconfig.c oconfig.h aux_types.h scanner.l parser.y \
                          action_graph.c action_graph.h \

+                         action_graph_data_json.c action_graph_data_json.h \

                          action_graph_def_json.c action_graph_def_json.h \
                          action_list_graphs.c action_list_graphs.h \
                          action_list_hosts.c action_list_hosts.h \
                          action_graph_def_json.c action_graph_def_json.h \
                          action_list_graphs.c action_list_graphs.h \
                          action_list_hosts.c action_list_hosts.h \

diff --git a/src/action_graph_data_json.c b/src/action_graph_data_json.c
new file mode 100644 (file)
index 0000000..388befd
--- /dev/null
+++ b/src/action_graph_data_json.c
@@ -0,0 +1,128 @@
+/**
+ * collection4 - action_graph_data_json.c
+ * Copyright (C) 2010  Florian octo Forster
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301  USA
+ *
+ * Authors:
+ *   Florian octo Forster <ff at octo.it>
+ **/
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <errno.h>
+#include <stdint.h>
+#include <inttypes.h>
+#include <assert.h>
+
+#include "action_graph_data_json.h"
+#include "common.h"
+#include "graph.h"
+#include "graph_instance.h"
+#include "graph_list.h"
+#include "utils_cgi.h"
+
+#include <fcgiapp.h>
+#include <fcgi_stdio.h>
+
+/* Expire data after one day. */
+#define EXPIRES_SECS 86400
+
+static void write_callback (__attribute__((unused)) void *ctx, /* {{{ */
+    const char *str, unsigned int len)
+{
+  fwrite ((void *) str, /* size = */ len, /* nmemb = */ 1, stdout);
+} /* }}} void write_callback */
+
+int action_graph_data_json (void) /* {{{ */
+{
+  graph_config_t *cfg;
+  graph_instance_t *inst;
+
+  time_t tt_begin = 0;
+  time_t tt_end = 0;
+  time_t tt_now = 0;
+
+  dp_time_t dp_begin = { 0, 0 };
+  dp_time_t dp_end = { 0, 0 };
+
+  yajl_gen_config handler_config;
+  yajl_gen handler;
+
+  time_t expires;
+  char time_buffer[128];
+  int status;
+
+  cfg = gl_graph_get_selected ();
+  if (cfg == NULL)
+    return (ENOMEM);
+
+  inst = inst_get_selected (cfg);
+  if (inst == NULL)
+    return (EINVAL);
+
+  /* Get selected time(s) */
+  tt_begin = tt_end = tt_now = 0;
+  status = get_time_args (&tt_begin, &tt_end, &tt_now);
+  if (status != 0)
+    return (status);
+
+  dp_begin.tv_sec = tt_begin;
+  dp_begin.tv_nsec = 0;
+  dp_end.tv_sec = tt_end;
+  dp_end.tv_nsec = 0;
+
+  memset (&handler_config, 0, sizeof (handler_config));
+  handler_config.beautify = 0;
+  handler_config.indentString = "  ";
+
+  handler = yajl_gen_alloc2 (write_callback,
+      &handler_config,
+      /* alloc functions = */ NULL,
+      /* context = */ NULL);
+  if (handler == NULL)
+  {
+    graph_destroy (cfg);
+    return (-1);
+  }
+
+  printf ("Content-Type: application/json\n");
+
+  /* By default, permit caching until 1/1000th after the last data. If that
+   * data is in the past, assume the entire data is in the past and allow
+   * caching for one day. */
+  expires = tt_end + ((tt_end - tt_begin) / 1000);
+  if (expires < tt_now)
+    expires = tt_now + 86400;
+
+  status = time_to_rfc1123 (expires, time_buffer, sizeof (time_buffer));
+  if (status == 0)
+    printf ("Expires: %s\n"
+        "Cache-Control: public\n",
+        time_buffer);
+  printf ("\n");
+
+  status = inst_data_to_json (inst,
+      dp_begin, dp_end, handler);
+
+  graph_destroy (cfg);
+  yajl_gen_free (handler);
+
+  return (status);
+} /* }}} int action_graph_data_json */
+
+/* vim: set sw=2 sts=2 et fdm=marker : */

diff --git a/src/action_graph_data_json.h b/src/action_graph_data_json.h
new file mode 100644 (file)
index 0000000..1da9571
--- /dev/null
+++ b/src/action_graph_data_json.h
@@ -0,0 +1,30 @@
+/**
+ * collection4 - action_graph_data_json.h
+ * Copyright (C) 2010  Florian octo Forster
+ * 
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA  02110-1301  USA
+ *
+ * Authors:
+ *   Florian octo Forster <ff at octo.it>
+ **/
+
+#ifndef ACTION_GRAPH_DATA_JSON_H
+#define ACTION_GRAPH_DATA_JSON_H 1
+
+int action_graph_data_json (void);
+
+#endif /* ACTION_GRAPH_DATA_JSON_H */
+/* vim: set sw=2 sts=2 et fdm=marker : */

diff --git a/src/main.c b/src/main.c
index b370e4c..2d05baa 100644 (file)
--- a/src/main.c
+++ b/src/main.c
@@ -37,6 +37,7 @@
 #include "utils_cgi.h"
 
 #include "action_graph.h"
 #include "utils_cgi.h"
 
 #include "action_graph.h"

+#include "action_graph_data_json.h"

 #include "action_graph_def_json.h"
 #include "action_list_graphs.h"
 #include "action_list_hosts.h"
 #include "action_graph_def_json.h"
 #include "action_list_graphs.h"
 #include "action_list_hosts.h"


@@ -63,6 +64,7 @@ static int action_usage (void);
 static const action_t actions[] =
 {
   { "graph",       action_graph },
 static const action_t actions[] =
 {
   { "graph",       action_graph },

+  { "graph_data_json", action_graph_data_json },

   { "graph_def_json", action_graph_def_json },
   { "list_graphs", action_list_graphs },
   { "list_hosts",  action_list_hosts },
   { "graph_def_json", action_graph_def_json },
   { "list_graphs", action_list_graphs },
   { "list_hosts",  action_list_hosts },