graph_list: Add basic configuration infrastructure.

diff --git a/graph_list.c b/graph_list.c
index eeab51a..d858374 100644 (file)
--- a/graph_list.c
+++ b/graph_list.c
@@ -5,15 +5,122 @@
 #include <errno.h>
 #include <assert.h>
 
+#include <fcgiapp.h>
+#include <fcgi_stdio.h>
+
 #include "graph_list.h"
 #include "common.h"
 
+/*
+ * Defines
+ */
 #define UPDATE_INTERVAL 10
 
-static graph_list_t *graph_list = NULL;
+#define ANY_TOKEN "/any/"
+#define ALL_TOKEN "/all/"
+
+/*
+ * 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;
+typedef struct graph_instance_s graph_instance_t;
+struct graph_instance_s
+{
+  graph_ident_t select;
+
+  graph_ident_t *files;
+  size_t files_num;
+
+  graph_instance_t *next;
+};
+
+struct graph_config_s;
+typedef struct graph_config_s graph_config_t;
+struct graph_config_s
+{
+  graph_ident_t select;
+
+  char *title;
+  char *vertical_label;
+
+  graph_instance_t *instances;
+
+  graph_config_t *next;
+};
+
+/*
+ * 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;
 
+/*
+ * Private functions
+ */
+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) /* {{{ */
 {
@@ -28,10 +135,335 @@ static int strcmp_s (const char *s1, const char *s2) /* {{{ */
   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 */
+
+/*
+ * 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) /* {{{ */
+{
+  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 (0);
+} /* }}} int FIXME_graph_create_from_file */
+
+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);
+
+  ident.plugin = "memory";
+  ident.plugin_instance = "";
+  ident.type = "memory";
+  FIXME_graph_create_from_file (&ident);
+
+  ident.plugin = "swap";
+  ident.plugin_instance = "";
+  ident.type = "swap";
+  FIXME_graph_create_from_file (&ident);
+
+  ident.plugin = ANY_TOKEN;
+  ident.plugin_instance = ANY_TOKEN;
+  ident.type = "ps_state";
+  FIXME_graph_create_from_file (&ident);
+
+  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);
+
+  return (0);
+} /* }}} int read_graph_config */
+
+
+
 static int gl_compare (const void *p0, const void *p1) /* {{{ */
 {
-  const graph_list_t *gl0 = p0;
-  const graph_list_t *gl1 = p1;
+  const graph_ident_t *gl0 = p0;
+  const graph_ident_t *gl1 = p1;
   int status;
 
   status = strcmp (gl0->host, gl1->host);
@@ -53,7 +485,7 @@ static int gl_compare (const void *p0, const void *p1) /* {{{ */
   return (strcmp_s (gl0->type_instance, gl1->type_instance));
 } /* }}} int gl_compare */
 
-static void gl_clear_entry (graph_list_t *gl) /* {{{ */
+static void gl_clear_entry (graph_ident_t *gl) /* {{{ */
 {
   if (gl == NULL)
     return;
@@ -84,9 +516,9 @@ static void gl_clear (void) /* {{{ */
   gl_last_update = 0;
 } /* }}} void gl_clear */
 
-static int gl_add_copy (graph_list_t *gl) /* {{{ */
+static int gl_add_copy (graph_ident_t *gl) /* {{{ */
 {
-  graph_list_t *ptr;
+  graph_ident_t *ptr;
   int status;
 
   if (gl == NULL)
@@ -145,7 +577,7 @@ 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))
@@ -165,6 +597,12 @@ 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);
 
@@ -177,7 +615,7 @@ 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))
@@ -197,6 +635,10 @@ 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);
 
@@ -209,7 +651,7 @@ 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))
@@ -231,12 +673,19 @@ static int callback_host (const char *host, void *user_data) /* {{{ */
   return (status);
 } /* }}} int callback_host */
 
+/*
+ * Global functions
+ */
 int gl_update (void) /* {{{ */
 {
   time_t now;
-  graph_list_t gl;
+  graph_ident_t gl;
   int status;
 
+  printf ("Content-Type: text/plain\n\n");
+
+  read_graph_config ();
+
   now = time (NULL);
 
   if ((gl_last_update + UPDATE_INTERVAL) >= now)
@@ -253,6 +702,8 @@ int gl_update (void) /* {{{ */
 
   status = foreach_host (callback_host, &gl);
 
+  print_graphs ();
+
   if (graph_list_length > 1)
     qsort (graph_list, graph_list_length, sizeof (*graph_list), gl_compare);
 
@@ -267,7 +718,7 @@ 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);
   }

diff --git a/graph_list.h b/graph_list.h
index 517b1b4..3669e02 100644 (file)
--- a/graph_list.h
+++ b/graph_list.h
@@ -1,6 +1,9 @@
 #ifndef GRAPH_LIST_H
 #define GRAPH_LIST_H 1
 
+struct graph_ident_s;
+typedef struct graph_ident_s graph_ident_t;
+
 struct graph_list_s
 {
   char *host;