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<?php
/*
** Zabbix
** Copyright (C) 2001-2019 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 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 General Public License for more details.
**
** You should have received a copy of the GNU 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.
**/
/**
* Shows surrogate screen filled with simple graphs generated by selected item prototype or preview of item prototype.
*/
class CScreenLldSimpleGraph extends CScreenLldGraphBase {
/**
* @var array
*/
protected $createdItemIds = [];
/**
* @var array
*/
protected $itemPrototype = null;
/**
* Makes and returns simple graph screen items.
*
* @return array
*/
protected function getSurrogateScreenItems() {
$createdItemIds = $this->getCreatedItemIds();
return $this->getSimpleGraphsForSurrogateScreen($createdItemIds);
}
/**
* Retrieves items created for item prototype given as resource for this screen item
* and returns array of the item IDs, ordered by item name.
*
* @return array
*/
protected function getCreatedItemIds() {
if (!$this->createdItemIds) {
$itemPrototype = $this->getItemPrototype();
if ($itemPrototype) {
// get all created (discovered) items for current host
$allCreatedItems = API::Item()->get([
'output' => ['itemid', 'name', 'key_', 'hostid'],
'hostids' => [$itemPrototype['discoveryRule']['hostid']],
'selectItemDiscovery' => ['itemid', 'parent_itemid'],
'filter' => ['flags' => ZBX_FLAG_DISCOVERY_CREATED],
]);
// collect those items where parent item is item prototype selected for this screen item as resource
$createdItems = [];
foreach ($allCreatedItems as $item) {
if ($item['itemDiscovery']['parent_itemid'] == $itemPrototype['itemid']) {
$createdItems[] = $item;
}
}
$createdItems = CMacrosResolverHelper::resolveItemNames($createdItems);
foreach ($createdItems as $item) {
$this->createdItemIds[$item['itemid']] = $item['name_expanded'];
}
natsort($this->createdItemIds);
$this->createdItemIds = array_keys($this->createdItemIds);
}
}
return $this->createdItemIds;
}
/**
* Makes and return simple graph screen items from given item IDs.
*
* @param array $itemIds
*
* @return array
*/
protected function getSimpleGraphsForSurrogateScreen(array $itemIds) {
$screenItemTemplate = $this->getScreenItemTemplate(SCREEN_RESOURCE_SIMPLE_GRAPH);
$screenItems = [];
foreach ($itemIds as $itemId) {
$screenItem = $screenItemTemplate;
$screenItem['resourceid'] = $itemId;
$screenItem['screenitemid'] = $itemId;
$screenItems[] = $screenItem;
}
return $screenItems;
}
/**
* Returns output for simple graph preview.
*
* @return CTag
*/
protected function getPreviewOutput() {
$itemPrototype = $this->getItemPrototype();
$queryParams = [
'items' => [$itemPrototype],
'period' => 3600,
'legend' => 1,
'width' => $this->screenitem['width'],
'height' => $this->screenitem['height'],
'name' => $itemPrototype['hosts'][0]['name'].NAME_DELIMITER.$itemPrototype['name']
];
return new CSpan(new CImg('chart3.php?'.http_build_query($queryParams)));
}
/**
* Resolves and retrieves effective item prototype used in this screen item.
*
* @return array|bool
*/
protected function getItemPrototype() {
if ($this->itemPrototype === null) {
$resourceid = array_key_exists('real_resourceid', $this->screenitem)
? $this->screenitem['real_resourceid']
: $this->screenitem['resourceid'];
$options = [
'output' => ['itemid', 'name'],
'selectHosts' => ['name'],
'selectDiscoveryRule' => ['hostid']
];
/*
* If screen item is dynamic or is templated screen, real item prototype is looked up by "key"
* used as resource ID for this screen item and by current host.
*/
if ($this->screenitem['dynamic'] == SCREEN_DYNAMIC_ITEM && $this->hostid) {
$currentItemPrototype = API::ItemPrototype()->get([
'output' => ['key_'],
'itemids' => [$resourceid]
]);
$currentItemPrototype = reset($currentItemPrototype);
$options['hostids'] = [$this->hostid];
$options['filter'] = ['key_' => $currentItemPrototype['key_']];
}
// otherwise just use resource ID given to to this screen item.
else {
$options['itemids'] = [$resourceid];
}
$selectedItemPrototype = API::ItemPrototype()->get($options);
$this->itemPrototype = reset($selectedItemPrototype);
}
return $this->itemPrototype;
}
}
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