X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=graph_list.c;h=3b634f5848488f4322be617cae2063a7491d2839;hb=b2db68ebb7acdb345c07985fcdb35dcfbb36d4aa;hp=baa8849ea0f9c9985e40da8457263f7e1404d0f8;hpb=9e5770370bb085ccfb19f3dd14707542bf1475f1;p=collection4.git

diff --git a/graph_list.c b/graph_list.c
index baa8849..3b634f5 100644
--- a/graph_list.c
+++ b/graph_list.c
@@ -1,19 +1,600 @@
 #include <stdlib.h>
 #include <stdio.h>
+#include <stdint.h>
+#include <inttypes.h>
 #include <string.h>
 #include <time.h>
 #include <errno.h>
+#include <assert.h>
+#include <limits.h> /* PATH_MAX */
 
 #include "graph_list.h"
 #include "common.h"
+#include "utils_params.h"
 
-static graph_list_t *graph_list = NULL;
+#include <fcgiapp.h>
+#include <fcgi_stdio.h>
+
+/*
+ * Defines
+ */
+#define UPDATE_INTERVAL 10
+
+#define ANY_TOKEN "/any/"
+#define ALL_TOKEN "/all/"
+
+#if 0
+# define GL_DEBUG(...) do {             \
+  printf ("Content-Type: text/plain\n\n"); \
+  printf (__VA_ARGS__);                    \
+} while (0)
+#else
+# define GL_DEBUG(...) /**/
+#endif
+
+/*
+ * Data types
+ */
+struct graph_ident_s /* {{{ */
+{
+  char *host;
+  char *plugin;
+  char *plugin_instance;
+  char *type;
+  char *type_instance;
+}; /* }}} struct graph_ident_s */
+
+struct graph_instance_s /* {{{ */
+{
+  graph_ident_t select;
+
+  graph_ident_t *files;
+  size_t files_num;
+
+  graph_instance_t *next;
+}; /* }}} struct graph_instance_s */
+
+struct graph_config_s /* {{{ */
+{
+  graph_ident_t select;
+
+  char *title;
+  char *vertical_label;
+
+  graph_instance_t *instances;
+
+  graph_config_t *next;
+}; /* }}} struct graph_config_s */
+
+/*
+ * Global variables
+ */
+static graph_config_t *graph_config_head = NULL;
+
+static graph_ident_t *graph_list = NULL;
 static size_t graph_list_length = 0;
 static time_t gl_last_update = 0;
 
-static int gl_add_copy (graph_list_t *gl) /* {{{ */
+/*
+ * Private functions
+ */
+/* FIXME: These "print_*" functions are used for debugging. They should be
+ * removed at some point. */
+static int print_files (const graph_instance_t *inst) /* {{{ */
+{
+  size_t i;
+
+  for (i = 0; i < inst->files_num; i++)
+  {
+    graph_ident_t *file = inst->files + i;
+
+    printf ("    File \"%s/%s-%s/%s-%s\"\n",
+        file->host,
+        file->plugin, file->plugin_instance,
+        file->type, file->type_instance);
+  }
+
+  return (0);
+} /* }}} int print_instances */
+
+static int print_instances (const graph_config_t *cfg) /* {{{ */
+{
+  graph_instance_t *inst;
+
+  for (inst = cfg->instances; inst != NULL; inst = inst->next)
+  {
+    printf ("  Instance \"%s/%s-%s/%s-%s\"\n",
+        inst->select.host,
+        inst->select.plugin, inst->select.plugin_instance,
+        inst->select.type, inst->select.type_instance);
+
+    print_files (inst);
+  }
+
+  return (0);
+} /* }}} int print_instances */
+
+static int print_graphs (void) /* {{{ */
+{
+  graph_config_t *cfg;
+
+  for (cfg = graph_config_head; cfg != NULL; cfg = cfg->next)
+  {
+    printf ("Graph \"%s/%s-%s/%s-%s\"\n",
+        cfg->select.host,
+        cfg->select.plugin, cfg->select.plugin_instance,
+        cfg->select.type, cfg->select.type_instance);
+
+    print_instances (cfg);
+  }
+
+  return (0);
+} /* }}} int print_graphs */
+
+/* "Safe" version of strcmp(3): Either or both pointers may be NULL. */
+static int strcmp_s (const char *s1, const char *s2) /* {{{ */
+{
+  if ((s1 == NULL) && (s2 == NULL))
+    return (0);
+  else if (s1 == NULL)
+    return (1);
+  else if (s2 == NULL)
+    return (-1);
+  assert ((s1 != NULL) && (s2 != NULL));
+
+  return (strcmp (s1, s2));
+} /* }}} int strcmp_s */
+
+static _Bool part_matches (const char *sel, const char *val) /* {{{ */
+{
+  if ((sel == NULL) && (val == NULL))
+    return (1);
+
+  if (sel == NULL) /* && (val != NULL) */
+    return (0);
+
+  if ((strcasecmp (ALL_TOKEN, sel) == 0)
+      || (strcasecmp (ANY_TOKEN, sel) == 0))
+    return (1);
+
+  if (val == NULL) /* && (sel != NULL) */
+    return (0);
+
+  if (strcmp (sel, val) == 0)
+    return (1);
+
+  return (0);
+} /* }}} _Bool part_matches */
+
+static _Bool file_matches (const graph_ident_t *sel, /* {{{ */
+    const graph_ident_t *val)
+{
+  if ((sel == NULL) && (val == NULL))
+    return (0);
+  else if (sel == NULL)
+    return (-1);
+  else if (val == NULL)
+    return (1);
+
+  if (!part_matches (sel->host, val->host))
+    return (0);
+
+  if (!part_matches (sel->plugin, val->plugin))
+    return (0);
+
+  if (!part_matches (sel->plugin_instance, val->plugin_instance))
+    return (0);
+
+  if (!part_matches (sel->type, val->type))
+    return (0);
+
+  if (!part_matches (sel->type_instance, val->type_instance))
+    return (0);
+
+  return (1);
+} /* }}} _Bool ident_compare */
+
+/* Free all the pointers contained in the graph_ident_t but don't free the
+ * graph_ident_t* itself. */
+static void ident_destroy (graph_ident_t *ident) /* {{{ */
+{
+  if (ident == NULL)
+    return;
+
+  free (ident->host);
+  ident->host = NULL;
+  free (ident->plugin);
+  ident->plugin = NULL;
+  free (ident->plugin_instance);
+  ident->plugin_instance = NULL;
+  free (ident->type);
+  ident->type = NULL;
+  free (ident->type_instance);
+  ident->type_instance = NULL;
+} /* }}} void ident_destroy */
+
+static void instance_destroy (graph_instance_t *inst) /* {{{ */
+{
+  graph_instance_t *next;
+  size_t i;
+
+  if (inst == NULL)
+    return;
+
+  next = inst->next;
+
+  ident_destroy (&inst->select);
+
+  for (i = 0; i < inst->files_num; i++)
+    ident_destroy (inst->files + i);
+  free (inst->files);
+
+  free (inst);
+
+  instance_destroy (next);
+} /* }}} void instance_destroy */
+
+static void graph_destroy (graph_config_t *cfg) /* {{{ */
+{
+  graph_config_t *next;
+
+  if (cfg == NULL)
+    return;
+
+  next = cfg->next;
+
+  ident_destroy (&cfg->select);
+
+  free (cfg->title);
+  free (cfg->vertical_label);
+
+  instance_destroy (cfg->instances);
+
+  graph_destroy (next);
+} /* }}} void graph_destroy */
+
+/*
+ * Copy part of an identifier. If the "template" value is ANY_TOKEN, "value" is
+ * copied and returned. This function is used when creating graph_instance_t
+ * from graph_config_t.
+ */
+static char *identifier_copy_part (const char *template, const char *value) /* {{{ */
+{
+  if (template == NULL)
+  {
+    return (NULL);
+  }
+  else if (strcasecmp (ANY_TOKEN, template) == 0)
+  {
+    /* ANY in the graph selection => concrete value in the instance. */
+    if (value == NULL)
+      return (NULL);
+    else
+      return (strdup (value));
+  }
+  else if (strcasecmp (ALL_TOKEN, template) == 0)
+  {
+    /* ALL in the graph selection => ALL in the instance. */
+    return (strdup (ALL_TOKEN));
+  }
+  else
+  {
+    assert (value != NULL);
+    assert (strcmp (template, value) == 0);
+    return (strdup (template));
+  }
+} /* }}} int identifier_copy_part */
+
+static graph_instance_t *instance_create (graph_config_t *cfg, /* {{{ */
+    const graph_ident_t *file)
+{
+  graph_instance_t *i;
+
+  if ((cfg == NULL) || (file == NULL))
+    return (NULL);
+
+  i = malloc (sizeof (*i));
+  if (i == NULL)
+    return (NULL);
+  memset (i, 0, sizeof (*i));
+
+  i->select.host = identifier_copy_part (cfg->select.host, file->host);
+  i->select.plugin = identifier_copy_part (cfg->select.plugin, file->plugin);
+  i->select.plugin_instance = identifier_copy_part (cfg->select.plugin_instance,
+      file->plugin_instance);
+  i->select.type = identifier_copy_part (cfg->select.type, file->type);
+  i->select.type_instance = identifier_copy_part (cfg->select.type_instance,
+      file->type_instance);
+
+  i->files = NULL;
+  i->files_num = 0;
+
+  i->next = NULL;
+
+  if (cfg->instances == NULL)
+    cfg->instances = i;
+  else
+  {
+    graph_instance_t *last;
+
+    last = cfg->instances;
+    while (last->next != NULL)
+      last = last->next;
+
+    last->next = i;
+  }
+
+  return (i);
+} /* }}} graph_instance_t *instance_create */
+
+static int instance_add_file (graph_instance_t *inst, /* {{{ */
+    const graph_ident_t *file)
+{
+  graph_ident_t *tmp;
+
+  tmp = realloc (inst->files, sizeof (*inst->files) * (inst->files_num + 1));
+  if (tmp == NULL)
+    return (ENOMEM);
+  inst->files = tmp;
+  tmp = inst->files + inst->files_num;
+
+  memset (tmp, 0, sizeof (*tmp));
+  tmp->host = strdup (file->host);
+  tmp->plugin = strdup (file->plugin);
+  if (file->plugin_instance != NULL)
+    tmp->plugin_instance = strdup (file->plugin_instance);
+  else
+    tmp->plugin_instance = NULL;
+  tmp->type = strdup (file->type);
+  if (file->type_instance != NULL)
+    tmp->type_instance = strdup (file->type_instance);
+  else
+    tmp->type_instance = NULL;
+
+  inst->files_num++;
+
+  return (0);
+} /* }}} int instance_add_file */
+
+static graph_instance_t *graph_find_instance (graph_config_t *cfg, /* {{{ */
+    const graph_ident_t *file)
+{
+  graph_instance_t *i;
+
+  if ((cfg == NULL) || (file == NULL))
+    return (NULL);
+
+  for (i = cfg->instances; i != NULL; i = i->next)
+    if (file_matches (&i->select, file))
+      return (i);
+
+  return (NULL);
+} /* }}} graph_instance_t *graph_find_instance */
+
+static int graph_add_file (graph_config_t *cfg, const graph_ident_t *file) /* {{{ */
+{
+  graph_instance_t *inst;
+
+  inst = graph_find_instance (cfg, file);
+  if (inst == NULL)
+  {
+    inst = instance_create (cfg, file);
+    if (inst == NULL)
+      return (ENOMEM);
+  }
+
+  return (instance_add_file (inst, file));
+} /* }}} int graph_add_file */
+
+static int graph_append (graph_config_t *cfg) /* {{{ */
+{
+  graph_config_t *last;
+
+  if (cfg == NULL)
+    return (EINVAL);
+
+  if (graph_config_head == NULL)
+  {
+    graph_config_head = cfg;
+    return (0);
+  }
+
+  last = graph_config_head;
+  while (last->next != NULL)
+    last = last->next;
+
+  last->next = cfg;
+
+  return (0);
+} /* }}} int graph_append */
+
+static int graph_create_from_file (const graph_ident_t *file) /* {{{ */
+{
+  graph_config_t *cfg;
+
+  cfg = malloc (sizeof (*cfg));
+  if (cfg == NULL)
+    return (ENOMEM);
+  memset (cfg, 0, sizeof (*cfg));
+
+  cfg->select.host = strdup (file->host);
+  cfg->select.plugin = strdup (file->plugin);
+  cfg->select.plugin_instance = strdup (file->plugin_instance);
+  cfg->select.type = strdup (file->type);
+  cfg->select.type_instance = strdup (file->type_instance);
+
+  cfg->title = NULL;
+  cfg->vertical_label = NULL;
+  cfg->instances = NULL;
+  cfg->next = NULL;
+
+  graph_append (cfg);
+
+  return (graph_add_file (cfg, file));
+} /* }}} int graph_create_from_file */
+
+static int register_file (const graph_ident_t *file) /* {{{ */
+{
+  graph_config_t *cfg;
+  int num_graphs = 0;
+
+  for (cfg = graph_config_head; cfg != NULL; cfg = cfg->next)
+  {
+    int status;
+
+    if (!file_matches (&cfg->select, file))
+      continue;
+
+    status = graph_add_file (cfg, file);
+    if (status != 0)
+    {
+      /* report error */;
+    }
+    else
+    {
+      num_graphs++;
+    }
+  }
+
+  if (num_graphs == 0)
+    graph_create_from_file (file);
+
+  return (0);
+} /* }}} int register_file */
+
+static int FIXME_graph_create_from_file (const graph_ident_t *file, /* {{{ */
+    const char *title)
+{
+  graph_config_t *cfg;
+
+  cfg = malloc (sizeof (*cfg));
+  if (cfg == NULL)
+    return (ENOMEM);
+  memset (cfg, 0, sizeof (*cfg));
+
+  cfg->select.host = strdup (file->host);
+  cfg->select.plugin = strdup (file->plugin);
+  cfg->select.plugin_instance = strdup (file->plugin_instance);
+  cfg->select.type = strdup (file->type);
+  cfg->select.type_instance = strdup (file->type_instance);
+
+  cfg->title = NULL;
+  if (title != NULL)
+    cfg->title = strdup (title);
+  cfg->vertical_label = NULL;
+  cfg->instances = NULL;
+  cfg->next = NULL;
+
+  graph_append (cfg);
+
+  return (0);
+} /* }}} int FIXME_graph_create_from_file */
+
+/* FIXME: Actually read the config file here. */
+static int read_graph_config (void) /* {{{ */
+{
+  if (graph_config_head != NULL)
+    return (0);
+
+  graph_ident_t ident;
+
+
+  ident.host = ANY_TOKEN;
+  ident.plugin = "cpu";
+  ident.plugin_instance = ANY_TOKEN;
+  ident.type = "cpu";
+  ident.type_instance = ALL_TOKEN;
+  FIXME_graph_create_from_file (&ident, "CPU {instance} usage");
+
+  ident.plugin = "memory";
+  ident.plugin_instance = "";
+  ident.type = "memory";
+  FIXME_graph_create_from_file (&ident, "Memory usage");
+
+  ident.plugin = "swap";
+  ident.plugin_instance = "";
+  ident.type = "swap";
+  FIXME_graph_create_from_file (&ident, "Swap");
+
+  ident.plugin = ANY_TOKEN;
+  ident.plugin_instance = ANY_TOKEN;
+  ident.type = "ps_state";
+  FIXME_graph_create_from_file (&ident, "Processes");
+
+  ident.host = ALL_TOKEN;
+  ident.plugin = "cpu";
+  ident.plugin_instance = ALL_TOKEN;
+  ident.type = "cpu";
+  ident.type_instance = "idle";
+  FIXME_graph_create_from_file (&ident, "CPU idle overview");
+
+  return (0);
+} /* }}} int read_graph_config */
+
+static int gl_compare (const void *p0, const void *p1) /* {{{ */
+{
+  const graph_ident_t *gl0 = p0;
+  const graph_ident_t *gl1 = p1;
+  int status;
+
+  status = strcmp (gl0->host, gl1->host);
+  if (status != 0)
+    return (status);
+
+  status = strcmp (gl0->plugin, gl1->plugin);
+  if (status != 0)
+    return (status);
+
+  status = strcmp_s (gl0->plugin_instance, gl1->plugin_instance);
+  if (status != 0)
+    return (status);
+
+  status = strcmp (gl0->type, gl1->type);
+  if (status != 0)
+    return (status);
+
+  return (strcmp_s (gl0->type_instance, gl1->type_instance));
+} /* }}} int gl_compare */
+
+static void gl_clear_entry (graph_ident_t *gl) /* {{{ */
 {
-  graph_list_t *ptr;
+  if (gl == NULL)
+    return;
+
+  free (gl->host);
+  free (gl->plugin);
+  free (gl->plugin_instance);
+  free (gl->type);
+  free (gl->type_instance);
+
+  gl->host = NULL;
+  gl->plugin = NULL;
+  gl->plugin_instance = NULL;
+  gl->type = NULL;
+  gl->type_instance = NULL;
+} /* }}} void gl_clear_entry */
+
+static void gl_clear (void) /* {{{ */
+{
+  size_t i;
+  graph_config_t *cfg;
+
+  cfg = graph_config_head;
+  graph_config_head = NULL;
+  graph_destroy (cfg);
+
+  for (i = 0; i < graph_list_length; i++)
+    gl_clear_entry (graph_list + i);
+
+  free (graph_list);
+  graph_list = NULL;
+  graph_list_length = 0;
+  gl_last_update = 0;
+} /* }}} void gl_clear */
+
+static int gl_add_copy (graph_ident_t *gl) /* {{{ */
+{
+  graph_ident_t *ptr;
   int status;
 
   if (gl == NULL)
@@ -72,7 +653,7 @@ static int gl_add_copy (graph_list_t *gl) /* {{{ */
 
 static int callback_type (const char *type, void *user_data) /* {{{ */
 {
-  graph_list_t *gl;
+  graph_ident_t *gl;
   int status;
 
   if ((type == NULL) || (user_data == NULL))
@@ -92,6 +673,12 @@ static int callback_type (const char *type, void *user_data) /* {{{ */
     *gl->type_instance = 0;
     gl->type_instance++;
   }
+  else
+  {
+    gl->type_instance = gl->type + strlen (gl->type);
+  }
+
+  register_file (gl);
 
   status = gl_add_copy (gl);
 
@@ -104,7 +691,7 @@ static int callback_type (const char *type, void *user_data) /* {{{ */
 
 static int callback_plugin (const char *plugin, void *user_data) /* {{{ */
 {
-  graph_list_t *gl;
+  graph_ident_t *gl;
   int status;
 
   if ((plugin == NULL) || (user_data == NULL))
@@ -124,6 +711,10 @@ static int callback_plugin (const char *plugin, void *user_data) /* {{{ */
     *gl->plugin_instance = 0;
     gl->plugin_instance++;
   }
+  else
+  {
+    gl->plugin_instance = gl->plugin + strlen (gl->plugin);
+  }
 
   status = foreach_type (gl->host, plugin, callback_type, gl);
 
@@ -136,7 +727,7 @@ static int callback_plugin (const char *plugin, void *user_data) /* {{{ */
 
 static int callback_host (const char *host, void *user_data) /* {{{ */
 {
-  graph_list_t *gl;
+  graph_ident_t *gl;
   int status;
 
   if ((host == NULL) || (user_data == NULL))
@@ -158,17 +749,387 @@ static int callback_host (const char *host, void *user_data) /* {{{ */
   return (status);
 } /* }}} int callback_host */
 
+static const char *get_part_from_param (const char *prim_key, /* {{{ */
+    const char *sec_key)
+{
+  const char *val;
+
+  val = param (prim_key);
+  if (val != NULL)
+    return (val);
+  
+  return (param (sec_key));
+} /* }}} const char *get_part_from_param */
+
+int gl_ident_get_rrdargs (graph_config_t *cfg, /* {{{ */
+    graph_instance_t *inst,
+    graph_ident_t *ident,
+    str_array_t *args)
+{
+  char *file;
+  char **dses = NULL;
+  size_t dses_num = 0;
+  int status;
+  size_t i;
+
+  if ((cfg == NULL) || (inst == NULL) || (ident == NULL) || (args == NULL))
+    return (EINVAL);
+
+  file = ident_to_file (ident);
+  if (file == NULL)
+  {
+    GL_DEBUG ("gl_ident_get_rrdargs: ident_to_file returned NULL.\n");
+    return (-1);
+  }
+
+  GL_DEBUG ("gl_ident_get_rrdargs: file = %s;\n", file);
+
+  status = ds_list_from_rrd_file (file, &dses_num, &dses);
+  if (status != 0)
+  {
+    free (file);
+    return (status);
+  }
+
+  for (i = 0; i < dses_num; i++)
+  {
+    int index;
+
+    GL_DEBUG ("gl_ident_get_rrdargs: ds[%lu] = %s;\n", (unsigned long) i, dses[i]);
+
+    index = array_argc (args);
+
+    /* CDEFs */
+    array_append_format (args, "DEF:def_%04i_min=%s:%s:MIN",
+        index, file, dses[i]);
+    array_append_format (args, "DEF:def_%04i_avg=%s:%s:AVERAGE",
+        index, file, dses[i]);
+    array_append_format (args, "DEF:def_%04i_max=%s:%s:MAX",
+        index, file, dses[i]);
+    /* VDEFs */
+    array_append_format (args, "VDEF:vdef_%04i_min=def_%04i_min,MINIMUM",
+        index, index);
+    array_append_format (args, "VDEF:vdef_%04i_avg=def_%04i_avg,AVERAGE",
+        index, index);
+    array_append_format (args, "VDEF:vdef_%04i_max=def_%04i_max,MAXIMUM",
+        index, index);
+    array_append_format (args, "VDEF:vdef_%04i_lst=def_%04i_avg,LAST",
+        index, index);
+
+    /* Graph part */
+    array_append_format (args, "LINE1:def_%04i_avg#%06"PRIx32":%s",
+        index, get_random_color (), dses[i]);
+    array_append_format (args, "GPRINT:vdef_%04i_min:%%lg min,", index);
+    array_append_format (args, "GPRINT:vdef_%04i_avg:%%lg avg,", index);
+    array_append_format (args, "GPRINT:vdef_%04i_max:%%lg max,", index);
+    array_append_format (args, "GPRINT:vdef_%04i_lst:%%lg last\\l", index);
+
+    free (dses[i]);
+  }
+  free (dses);
+
+  free (file);
+
+  return (0);
+} /* }}} int gl_ident_get_rrdargs */
+
+/*
+ * Global functions
+ */
+char *ident_to_file (const graph_ident_t *ident) /* {{{ */
+{
+  char buffer[PATH_MAX];
+
+  buffer[0] = 0;
+
+  strlcat (buffer, DATA_DIR, sizeof (buffer));
+  strlcat (buffer, "/", sizeof (buffer));
+
+  strlcat (buffer, ident->host, sizeof (buffer));
+  strlcat (buffer, "/", sizeof (buffer));
+  strlcat (buffer, ident->plugin, sizeof (buffer));
+  if (ident->plugin_instance[0] != 0)
+  {
+    strlcat (buffer, "-", sizeof (buffer));
+    strlcat (buffer, ident->plugin_instance, sizeof (buffer));
+  }
+  strlcat (buffer, "/", sizeof (buffer));
+  strlcat (buffer, ident->type, sizeof (buffer));
+  if (ident->type_instance[0] != 0)
+  {
+    strlcat (buffer, "-", sizeof (buffer));
+    strlcat (buffer, ident->type_instance, sizeof (buffer));
+  }
+
+  strlcat (buffer, ".rrd", sizeof (buffer));
+
+  return (strdup (buffer));
+} /* }}} char *ident_to_file */
+
+int gl_instance_get_params (graph_config_t *cfg, graph_instance_t *inst, /* {{{ */
+    char *buffer, size_t buffer_size)
+{
+  if ((inst == NULL) || (buffer == NULL) || (buffer_size < 1))
+    return (EINVAL);
+
+  buffer[0] = 0;
+
+#define COPY_FIELD(field) do {                                  \
+  if (strcmp (cfg->select.field, inst->select.field) == 0)      \
+  {                                                             \
+    strlcat (buffer, #field, buffer_size);                      \
+    strlcat (buffer, "=", buffer_size);                         \
+    strlcat (buffer, cfg->select.field, buffer_size);           \
+  }                                                             \
+  else                                                          \
+  {                                                             \
+    strlcat (buffer, "graph_", buffer_size);                    \
+    strlcat (buffer, #field, buffer_size);                      \
+    strlcat (buffer, "=", buffer_size);                         \
+    strlcat (buffer, cfg->select.field, buffer_size);           \
+    strlcat (buffer, ";", buffer_size);                         \
+    strlcat (buffer, "inst_", buffer_size);                     \
+    strlcat (buffer, #field, buffer_size);                      \
+    strlcat (buffer, "=", buffer_size);                         \
+    strlcat (buffer, inst->select.field, buffer_size);          \
+  }                                                             \
+} while (0)
+
+  COPY_FIELD(host);
+  strlcat (buffer, ";", buffer_size);
+  COPY_FIELD(plugin);
+  strlcat (buffer, ";", buffer_size);
+  COPY_FIELD(plugin_instance);
+  strlcat (buffer, ";", buffer_size);
+  COPY_FIELD(type);
+  strlcat (buffer, ";", buffer_size);
+  COPY_FIELD(type_instance);
+
+#undef COPY_FIELD
+
+  return (0);
+} /* }}} int gl_instance_get_params */
+
+graph_instance_t *inst_get_selected (graph_config_t *cfg) /* {{{ */
+{
+  const char *host = get_part_from_param ("inst_host", "host");
+  const char *plugin = get_part_from_param ("inst_plugin", "plugin");
+  const char *plugin_instance = get_part_from_param ("inst_plugin_instance", "plugin_instance");
+  const char *type = get_part_from_param ("inst_type", "type");
+  const char *type_instance = get_part_from_param ("inst_type_instance", "type_instance");
+  graph_instance_t *inst;
+
+  if (cfg == NULL)
+    cfg = graph_get_selected ();
+
+  if (cfg == NULL)
+  {
+    GL_DEBUG ("inst_get_selected: cfg == NULL;\n");
+    return (NULL);
+  }
+
+  if ((host == NULL)
+      || (plugin == NULL) || (plugin_instance == NULL)
+      || (type == NULL) || (type_instance == NULL))
+  {
+    GL_DEBUG ("inst_get_selected: A parameter is NULL.\n");
+    return (NULL);
+  }
+
+  for (inst = cfg->instances; inst != NULL; inst = inst->next)
+  {
+    if ((strcmp (inst->select.host, host) != 0)
+        || (strcmp (inst->select.plugin, plugin) != 0)
+        || (strcmp (inst->select.plugin_instance, plugin_instance) != 0)
+        || (strcmp (inst->select.type, type) != 0)
+        || (strcmp (inst->select.type_instance, type_instance) != 0))
+      continue;
+
+    return (inst);
+  }
+
+  GL_DEBUG ("inst_get_selected: No match found.\n");
+  return (NULL);
+} /* }}} graph_instance_t *inst_get_selected */
+
+int gl_graph_get_all (gl_cfg_callback callback, /* {{{ */
+    void *user_data)
+{
+  graph_config_t *cfg;
+
+  if (callback == NULL)
+    return (EINVAL);
+
+  gl_update ();
+
+  for (cfg = graph_config_head; cfg != NULL; cfg = cfg->next)
+  {
+    int status;
+
+    status = (*callback) (cfg, user_data);
+    if (status != 0)
+      return (status);
+  }
+
+  return (0);
+} /* }}} int gl_graph_get_all */
+
+graph_config_t *graph_get_selected (void) /* {{{ */
+{
+  const char *host = get_part_from_param ("graph_host", "host");
+  const char *plugin = get_part_from_param ("graph_plugin", "plugin");
+  const char *plugin_instance = get_part_from_param ("graph_plugin_instance", "plugin_instance");
+  const char *type = get_part_from_param ("graph_type", "type");
+  const char *type_instance = get_part_from_param ("graph_type_instance", "type_instance");
+  graph_config_t *cfg;
+
+  if ((host == NULL)
+      || (plugin == NULL) || (plugin_instance == NULL)
+      || (type == NULL) || (type_instance == NULL))
+  {
+    printf ("Content-Type: text/plain\n\n");
+    printf ("graph_get_selected(): A param is NULL.\n");
+    return (NULL);
+  }
+
+  gl_update ();
+
+  for (cfg = graph_config_head; cfg != NULL; cfg = cfg->next)
+  {
+    if ((strcmp (cfg->select.host, host) != 0)
+        || (strcmp (cfg->select.plugin, plugin) != 0)
+        || (strcmp (cfg->select.plugin_instance, plugin_instance) != 0)
+        || (strcmp (cfg->select.type, type) != 0)
+        || (strcmp (cfg->select.type_instance, type_instance) != 0))
+      continue;
+
+    return (cfg);
+  }
+
+  printf ("Content-Type: text/plain\n\n");
+  printf ("graph_get_selected(): No matching graph found.\n");
+
+  return (NULL);
+} /* }}} graph_config_t *graph_get_selected */
+
+int gl_graph_instance_get_all (graph_config_t *cfg, /* {{{ */
+    gl_inst_callback callback, void *user_data)
+{
+  graph_instance_t *inst;
+
+  if ((cfg == NULL) || (callback == NULL))
+    return (EINVAL);
+
+  for (inst = cfg->instances; inst != NULL; inst = inst->next)
+  {
+    int status;
+
+    status = (*callback) (cfg, inst, user_data);
+    if (status != 0)
+      return (status);
+  }
+
+  return (0);
+} /* }}} int gl_graph_instance_get_all */
+
+int gl_graph_get_title (graph_config_t *cfg, /* {{{ */
+    char *buffer, size_t buffer_size)
+{
+  if ((cfg == NULL) || (buffer == NULL) || (buffer_size < 1))
+    return (EINVAL);
+
+  buffer[0] = 0;
+  strlcat (buffer, cfg->select.host, buffer_size);
+  strlcat (buffer, "/", buffer_size);
+  strlcat (buffer, cfg->select.plugin, buffer_size);
+  if (cfg->select.plugin_instance[0] != 0)
+  {
+    strlcat (buffer, "-", buffer_size);
+    strlcat (buffer, cfg->select.plugin_instance, buffer_size);
+  }
+  strlcat (buffer, "/", buffer_size);
+  strlcat (buffer, cfg->select.type, buffer_size);
+  if (cfg->select.type_instance[0] != 0)
+  {
+    strlcat (buffer, "-", buffer_size);
+    strlcat (buffer, cfg->select.type_instance, buffer_size);
+  }
+
+  return (0);
+} /* }}} int gl_graph_get_title */
+
+int gl_instance_get_all (gl_inst_callback callback, /* {{{ */
+    void *user_data)
+{
+  graph_config_t *cfg;
+
+  gl_update ();
+
+  for (cfg = graph_config_head; cfg != NULL; cfg = cfg->next)
+  {
+    graph_instance_t *inst;
+
+    for (inst = cfg->instances; inst != NULL; inst = inst->next)
+    {
+      int status;
+
+      status = (*callback) (cfg, inst, user_data);
+      if (status != 0)
+        return (status);
+    }
+  }
+
+  return (0);
+} /* }}} int gl_instance_get_all */
+
+int gl_instance_get_rrdargs (graph_config_t *cfg, /* {{{ */
+    graph_instance_t *inst,
+    str_array_t *args)
+{
+  size_t i;
+
+  if ((cfg == NULL) || (inst == NULL) || (args == NULL))
+    return (EINVAL);
+
+  if (cfg->title != NULL)
+  {
+    array_append (args, "-t");
+    array_append (args, cfg->title);
+  }
+
+  for (i = 0; i < inst->files_num; i++)
+  {
+    int status;
+
+    status = gl_ident_get_rrdargs (cfg, inst, inst->files + i, args);
+    if (status != 0)
+      return (status);
+  }
+
+  return (0);
+} /* }}} int gl_instance_get_rrdargs */
+
+/* DELETEME */
+
 int gl_update (void) /* {{{ */
 {
   time_t now;
-  graph_list_t gl;
+  graph_ident_t gl;
   int status;
 
+  /*
+  printf ("Content-Type: text/plain\n\n");
+  */
+
   now = time (NULL);
 
-  if ((gl_last_update + 2) >= now)
+  if ((gl_last_update + UPDATE_INTERVAL) >= now)
     return (0);
 
+  gl_clear ();
+
+  read_graph_config ();
+
   memset (&gl, 0, sizeof (gl));
   gl.host = NULL;
   gl.plugin = NULL;
@@ -176,9 +1137,13 @@ int gl_update (void) /* {{{ */
   gl.type = NULL;
   gl.type_instance = NULL;
 
-  /* TODO: Free old list */
-
   status = foreach_host (callback_host, &gl);
+
+  /* print_graphs (); */
+
+  if (graph_list_length > 1)
+    qsort (graph_list, graph_list_length, sizeof (*graph_list), gl_compare);
+
   return (status);
 } /* }}} int gl_update */
 
@@ -190,7 +1155,7 @@ int gl_foreach (gl_callback callback, void *user_data) /* {{{ */
   {
     int status;
 
-    status = (*callback) (graph_list + i, user_data);
+    status = (*callback) ((void *) (graph_list + i), user_data);
     if (status != 0)
       return (status);
   }