Merge pull request #603 from dawnbreak/docu

Some documentation for include/config.php.

1 files changed, 269 insertions, 105 deletions

diff --git a/include/config.php b/include/config.php
index add7b5f71..a77801717 100644
--- a/include/config.php
+++ b/include/config.php
@@ -1,30 +1,56 @@
-<?php /** @file */
-
+<?php
 /**
+ * @file include/config.php
+ * @brief Arbitrary configuration storage.
  *
- * Arbitrary configuration storage
  * Note:
  * Please do not store booleans - convert to 0/1 integer values
  * The get_?config() functions return boolean false for keys that are unset,
  * and this could lead to subtle bugs.
  *
- * There are a few places in the code (such as the admin panel) where boolean
- * configurations need to be fixed as of 10/08/2011.
+ * Arrays get stored as serialize strings.
+ *
+ * @todo There are a few places in the code (such as the admin panel) where
+ * boolean configurations need to be fixed as of 10/08/2011.
+ *
+ * - <b>config</b> is used for hub specific configurations. It overrides the
+ * configurations from .htconfig file. The storage is of size TEXT.
+ * - <b>pconfig</b> is used for channel specific configurations and takes a
+ * <i>channel_id</i> as identifier. It stores for example which features are
+ * enabled per channel. The storage is of size MEDIUMTEXT.
+ * @code $var = get_pconfig(local_user(), 'category', 'key');@endcode
+ * - <b>xconfig</b> is the same as pconfig, except that it uses <i>xchan</i> as
+ * an identifier. This is for example for people who do not have a local account.
+ * The storage is of size MEDIUMTEXT.
+ * @code $observer = $a->get_observer_hash();
+ * if ($observer) {
+ *     $var = get_xconfig($observer, 'category', 'key');
+ * }@endcode
+ *
+ * - get_config() and set_config() can also be done through the command line tool
+ * @ref util/config
+ * - get_pconfig() and set_pconfig() can also be done through the command line tool
+ * @ref util/pconfig and takes a channel_id as first argument. 
+ *
  */
 
-
-// retrieve a "family" of config variables from database to cached storage
-
+/**
+ * @brief Loads the hub's configuration from database to a cached storage.
+ *
+ * Retrieve a category ($family) of config variables from database to a cached
+ * storage in the global $a->config[$family].
+ *
+ * @param string $family
+ *  The category of the configuration value
+ */
 function load_config($family) {
 	global $a;
 
-	if(! array_key_exists($family,$a->config))
+	if(! array_key_exists($family, $a->config))
 		$a->config[$family] = array();
 
-	if(! array_key_exists('config_loaded',$a->config[$family])) {
-
+	if(! array_key_exists('config_loaded', $a->config[$family])) {
 		$r = q("SELECT * FROM config WHERE cat = '%s'", dbesc($family));
-
 		if($r !== false) {
 			if($r) {
 				foreach($r as $rr) {
@@ -37,24 +63,31 @@ function load_config($family) {
 	} 
 }
 
-// get a particular config variable given the family name
-// and key. Returns false if not set.
-// $instore is only used by the set_config function
-// to determine if the key already exists in the DB
-// If a key is found in the DB but doesn't exist in
-// local config cache, pull it into the cache so we don't have
-// to hit the DB again for this item.
-
-
+/**
+ * @brief Get a particular config variable given the category name ($family)
+ * and a key.
+ *
+ * Get a particular config variable from the given category ($family) and the
+ * $key from a cached storage in $a->config[$family]. If a key is found in the
+ * DB but does not exist in local config cache, pull it into the cache so we
+ * do not have to hit the DB again for this item.
+ * 
+ * Returns false if not set.
+ *
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to query
+ * @return mixed Return value or false on error or if not set
+ */
 function get_config($family, $key) {
-
 	global $a;
 
-	if((! array_key_exists($family,$a->config)) || (! array_key_exists('config_loaded',$a->config[$family])))
+	if((! array_key_exists($family, $a->config)) || (! array_key_exists('config_loaded', $a->config[$family])))
 		load_config($family);
 
-	if(array_key_exists('config_loaded',$a->config[$family])) {
-		if(! array_key_exists($key,$a->config[$family])) {
+	if(array_key_exists('config_loaded', $a->config[$family])) {
+		if(! array_key_exists($key, $a->config[$family])) {
 			return false;		
 		}
 		return ((! is_array($a->config[$family][$key])) && (preg_match('|^a:[0-9]+:{.*}$|s', $a->config[$family][$key])) 
@@ -65,36 +98,59 @@ function get_config($family, $key) {
 	return false;
 }
 
-function get_config_from_storage($family,$key) {
-	$ret = q("select * from config where cat = '%s' and k = '%s' limit 1",
+/**
+ * @brief Returns a value directly from the database configuration storage.
+ *
+ * This function queries directly the database and bypasses the chached storage
+ * from get_config($family, $key).
+ *
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to query
+ * @return mixed
+ */
+function get_config_from_storage($family, $key) {
+	$ret = q("SELECT * FROM config WHERE cat = '%s' AND k = '%s' LIMIT 1",
 		dbesc($family),
 		dbesc($key)
 	);
 	return $ret;
 }
 
-
-
-// Store a config value ($value) in the category ($family)
-// under the key ($key)
-// Return the value, or false if the database update failed
-
-function set_config($family,$key,$value) {
+/**
+ * @brief Sets a configuration value for the hub.
+ *
+ * Stores a config value ($value) in the category ($family) under the key ($key).
+ *
+ * Please do not store booleans - convert to 0/1 integer values!
+ *
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to set
+ * @param mixed $value
+ *  The value to store in the configuration
+ * @return mixed
+ *  Return the set value, or false if the database update failed
+ */
+function set_config($family, $key, $value) {
 	global $a;
+
 	// manage array value
 	$dbvalue = ((is_array($value))  ? serialize($value) : $value);
 	$dbvalue = ((is_bool($dbvalue)) ? intval($dbvalue)  : $dbvalue);
 
-	if(get_config($family,$key) === false || (! get_config_from_storage($family,$key))) {
-		$a->config[$family][$key] = $value;
-
+	if(get_config($family, $key) === false || (! get_config_from_storage($family, $key))) {
 		$ret = q("INSERT INTO config ( cat, k, v ) VALUES ( '%s', '%s', '%s' ) ",
 			dbesc($family),
 			dbesc($key),
 			dbesc($dbvalue)
 		);
-		if($ret)
-			return $value;
+		if($ret) {
+			$a->config[$family][$key] = $value;
+			$ret = $value;
+		}
 		return $ret;
 	}
 
@@ -104,18 +160,32 @@ function set_config($family,$key,$value) {
 		dbesc($key)
 	);
 
-	$a->config[$family][$key] = $value;
-
-	if($ret)
-		return $value;
+	if($ret) {
+		$a->config[$family][$key] = $value;
+		$ret = $value;
+	}
 	return $ret;
 }
 
-function del_config($family,$key) {
+/**
+ * @brief Deletes the given key from the hub's configuration database.
+ *
+ * Removes the configured value from the stored cache in $a->config[$family]
+ * and removes it from the database.
+ *
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to delete
+ * @return mixed
+ */
+function del_config($family, $key) {
 	global $a;
-	if(array_key_exists($family,$a->config) && array_key_exists($key,$a->config[$family]))
+	$ret = false;
+
+	if(array_key_exists($family, $a->config) && array_key_exists($key, $a->config[$family]))
 		unset($a->config[$family][$key]);
-	$ret = q("DELETE FROM config WHERE cat = '%s' AND k = '%s' LIMIT 1",
+		$ret = q("DELETE FROM config WHERE cat = '%s' AND k = '%s' LIMIT 1",
 		dbesc($family),
 		dbesc($key)
 	);
@@ -123,17 +193,25 @@ function del_config($family,$key) {
 }
 
 
-function load_pconfig($uid,$family = '') {
+/**
+ * @brief Loads all configuration values of a channel into a cached storage.
+ *
+ * All configuration values of the given channel are stored in global cache
+ * which is available under the global variable $a->config[$uid].
+ *
+ * @param string $uid
+ *  The channel_id
+ * @return void|false Nothing or false if $uid is false
+ */
+function load_pconfig($uid) {
 	global $a;
 
 	if($uid === false)
 		return false;
 
-	if(! array_key_exists($uid,$a->config))
+	if(! array_key_exists($uid, $a->config))
 		$a->config[$uid] = array();
 
-	// family is no longer used - load entire user config
-
 	$r = q("SELECT * FROM `pconfig` WHERE `uid` = %d",
 		intval($uid)
 	);
@@ -142,59 +220,88 @@ function load_pconfig($uid,$family = '') {
 		foreach($r as $rr) {
 			$k = $rr['k'];
 			$c = $rr['cat'];
-			if(! array_key_exists($c,$a->config[$uid])) {
+			if(! array_key_exists($c, $a->config[$uid])) {
 				$a->config[$uid][$c] = array();
 				$a->config[$uid][$c]['config_loaded'] = true;
 			}
 			$a->config[$uid][$c][$k] = $rr['v'];
 		}
-	} 
+	}
 }
 
-
-
-
-function get_pconfig($uid,$family, $key, $instore = false) {
-
+/**
+ * @brief Get a particular channel's config variable given the category name
+ * ($family) and a key.
+ *
+ * Get a particular channel's config value from the given category ($family)
+ * and the $key from a cached storage in $a->config[$uid].
+ *
+ * Returns false if not set.
+ *
+ * @param string $uid
+ *  The channel_id
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to query
+ * @param boolean $instore (deprecated, without function)
+ * @return mixed Stored value or false if it does not exist
+ */
+function get_pconfig($uid, $family, $key, $instore = false) {
+	logger('include/config.php: get_pconfig() deprecated instore param used', LOGGER_DEBUG);
 	global $a;
 
 	if($uid === false)
 		return false;
 
-	if(! array_key_exists($uid,$a->config))
+	if(! array_key_exists($uid, $a->config))
 		load_pconfig($uid);
 
-	if((! array_key_exists($family,$a->config[$uid])) || (! array_key_exists($key,$a->config[$uid][$family])))
+	if((! array_key_exists($family, $a->config[$uid])) || (! array_key_exists($key, $a->config[$uid][$family])))
 		return false;
-		
+
 	return ((! is_array($a->config[$uid][$family][$key])) && (preg_match('|^a:[0-9]+:{.*}$|s', $a->config[$uid][$family][$key])) 
 		? unserialize($a->config[$uid][$family][$key])
 		: $a->config[$uid][$family][$key]
 	);
 }
 
-function set_pconfig($uid,$family,$key,$value) {
-
+/**
+ * @brief Sets a configuration value for a channel.
+ *
+ * Stores a config value ($value) in the category ($family) under the key ($key)
+ * for the channel_id $uid.
+ *
+ * Please do not store booleans - convert to 0/1 integer values!
+ *
+ * @param string $uid
+ *  The channel_id
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to query
+ * @return mixed Stored $value or false
+ */
+function set_pconfig($uid, $family, $key, $value) {
 	global $a;
 
-
 	// manage array value
 	$dbvalue = ((is_array($value))  ? serialize($value) : $value);
 	$dbvalue = ((is_bool($dbvalue)) ? intval($dbvalue)  : $dbvalue);
 
-	if(get_pconfig($uid,$family,$key) === false) {
-		if(! array_key_exists($uid,$a->config))
+	if(get_pconfig($uid, $family, $key) === false) {
+		if(! array_key_exists($uid, $a->config))
 			$a->config[$uid] = array();
-		if(! array_key_exists($family,$a->config[$uid]))
+		if(! array_key_exists($family, $a->config[$uid]))
 			$a->config[$uid][$family] = array();
 
 		// keep a separate copy for all variables which were
 		// set in the life of this page. We need this to
 		// synchronise channel clones.
 
-		if(! array_key_exists('transient',$a->config[$uid]))
+		if(! array_key_exists('transient', $a->config[$uid]))
 			$a->config[$uid]['transient'] = array();
-		if(! array_key_exists($family,$a->config[$uid]['transient']))
+		if(! array_key_exists($family, $a->config[$uid]['transient']))
 			$a->config[$uid]['transient'][$family] = array();
 
 		$a->config[$uid][$family][$key] = $value;
@@ -222,9 +329,9 @@ function set_pconfig($uid,$family,$key,$value) {
 	// set in the life of this page. We need this to
 	// synchronise channel clones.
 
-	if(! array_key_exists('transient',$a->config[$uid]))
+	if(! array_key_exists('transient', $a->config[$uid]))
 		$a->config[$uid]['transient'] = array();
-	if(! array_key_exists($family,$a->config[$uid]['transient']))
+	if(! array_key_exists($family, $a->config[$uid]['transient']))
 		$a->config[$uid]['transient'][$family] = array();
 
 	$a->config[$uid][$family][$key] = $value;
@@ -235,13 +342,27 @@ function set_pconfig($uid,$family,$key,$value) {
 	return $ret;
 }
 
-
-function del_pconfig($uid,$family,$key) {
-
+/**
+ * @brief Deletes the given key from the channel's configuration.
+ *
+ * Removes the configured value from the stored cache in $a->config[$uid]
+ * and removes it from the database.
+ *
+ * @param string $uid
+ *  The channel_id
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to delete
+ * @return mixed
+ */
+function del_pconfig($uid, $family, $key) {
 	global $a;
-	if(x($a->config[$uid][$family],$key))
+	$ret = false;
+
+	if(x($a->config[$uid][$family], $key))
 		unset($a->config[$uid][$family][$key]);
-	$ret = q("DELETE FROM pconfig WHERE uid = %d AND cat = '%s' AND k = '%s' LIMIT 1",
+		$ret = q("DELETE FROM pconfig WHERE uid = %d AND cat = '%s' AND k = '%s' LIMIT 1",
 		intval($uid),
 		dbesc($family),
 		dbesc($key)
@@ -250,18 +371,25 @@ function del_pconfig($uid,$family,$key) {
 }
 
 
-
-function load_xconfig($xchan,$family = '') {
+/**
+ * @brief Loads a full xchan's configuration into a cached storage.
+ *
+ * All configuration values of the given observer hash are stored in global
+ * cache which is available under the global variable $a->config[$xchan].
+ *
+ * @param string $xchan
+ *  The observer's hash
+ * @return void|false Returns false if xchan is not set
+ */
+function load_xconfig($xchan) {
 	global $a;
 
 	if(! $xchan)
 		return false;
 
-	if(! array_key_exists($xchan,$a->config))
+	if(! array_key_exists($xchan, $a->config))
 		$a->config[$xchan] = array();
 
-	// family is no longer used. Entire config is loaded
-
 	$r = q("SELECT * FROM `xconfig` WHERE `xchan` = '%s'",
 		dbesc($xchan)
 	);
@@ -270,51 +398,77 @@ function load_xconfig($xchan,$family = '') {
 		foreach($r as $rr) {
 			$k = $rr['k'];
 			$c = $rr['cat'];
-			if(! array_key_exists($c,$a->config[$xchan])) {
+			if(! array_key_exists($c, $a->config[$xchan])) {
 				$a->config[$xchan][$c] = array();
 				$a->config[$xchan][$c]['config_loaded'] = true;
 			}
 			$a->config[$xchan][$c][$k] = $rr['v'];
 		}
-	} 
+	}
 }
 
-
-
-
-function get_xconfig($xchan,$family, $key) {
-
+/**
+ * @brief Get a particular observer's config variable given the category
+ * name ($family) and a key.
+ *
+ * Get a particular observer's config value from the given category ($family)
+ * and the $key from a cached storage in $a->config[$xchan].
+ *
+ * Returns false if not set.
+ *
+ * @param string $xchan
+ *  The observer's hash
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to query
+ * @return mixed Stored $value or false if it does not exist
+ */
+function get_xconfig($xchan, $family, $key) {
 	global $a;
 
 	if(! $xchan)
 		return false;
 
-	if(! array_key_exists($xchan,$a->config))
+	if(! array_key_exists($xchan, $a->config))
 		load_xconfig($xchan);
 
-	if((! array_key_exists($family,$a->config[$xchan])) || (! array_key_exists($key,$a->config[$xchan][$family])))
+	if((! array_key_exists($family, $a->config[$xchan])) || (! array_key_exists($key, $a->config[$xchan][$family])))
 		return false;
 
 	return ((! is_array($a->config[$xchan][$family][$key])) && (preg_match('|^a:[0-9]+:{.*}$|s', $a->config[$xchan][$family][$key])) 
 		? unserialize($a->config[$xchan][$family][$key])
 		: $a->config[$xchan][$family][$key]
 	);
-
 }
 
-
-function set_xconfig($xchan,$family,$key,$value) {
-
+/**
+ * @brief Sets a configuration value for an observer.
+ *
+ * Stores a config value ($value) in the category ($family) under the key ($key)
+ * for the observer's $xchan hash.
+ *
+ * Please do not store booleans - convert to 0/1 integer values!
+ *
+ * @param string $xchan
+ *  The observer's hash
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to set
+ * @return mixed Stored $value or false
+ */
+function set_xconfig($xchan, $family, $key, $value) {
 	global $a;
 
 	// manage array value
 	$dbvalue = ((is_array($value))  ? serialize($value) : $value);
 	$dbvalue = ((is_bool($dbvalue)) ? intval($dbvalue)  : $dbvalue);
 
-	if(get_xconfig($xchan,$family,$key) === false) {
-		if(! array_key_exists($xchan,$a->config))
+	if(get_xconfig($xchan, $family, $key) === false) {
+		if(! array_key_exists($xchan, $a->config))
 			$a->config[$xchan] = array();
-		if(! array_key_exists($family,$a->config[$xchan]))
+		if(! array_key_exists($family, $a->config[$xchan]))
 			$a->config[$xchan][$family] = array();
 
 		$a->config[$xchan][$family][$key] = $value;
@@ -341,22 +495,32 @@ function set_xconfig($xchan,$family,$key,$value) {
 	if($ret)
 		return $value;
 	return $ret;
-
 }
 
-
-function del_xconfig($xchan,$family,$key) {
-
+/**
+ * @brief Deletes the given key from the observer's config.
+ *
+ * Removes the configured value from the stored cache in $a->config[$xchan]
+ * and removes it from the database.
+ *
+ * @param string $xchan
+ *  The observer's hash
+ * @param string $family
+ *  The category of the configuration value
+ * @param string $key
+ *  The configuration key to delete
+ * @return mixed
+ */
+function del_xconfig($xchan, $family, $key) {
 	global $a;
-	if(x($a->config[$xchan][$family],$key))
+	$ret = false;
+
+	if(x($a->config[$xchan][$family], $key))
 		unset($a->config[$xchan][$family][$key]);
-	$ret = q("DELETE FROM `xconfig` WHERE `xchan` = '%s' AND `cat` = '%s' AND `k` = '%s' LIMIT 1",
+		$ret = q("DELETE FROM `xconfig` WHERE `xchan` = '%s' AND `cat` = '%s' AND `k` = '%s' LIMIT 1",
 		dbesc($xchan),
 		dbesc($family),
 		dbesc($key)
 	);
 	return $ret;
 }
-
-
-