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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.
**/
/**
* Class to perform low level application related actions.
*/
class CApplicationManager {
/**
* Create new applications.
*
* @param array $applications
*
* @return array
*/
public function create(array $applications) {
$insertApplications = $applications;
foreach ($insertApplications as &$app) {
unset($app['applicationTemplates']);
}
unset($app);
$applicationids = DB::insertBatch('applications', $insertApplications);
$applicationTemplates = [];
foreach ($applications as $anum => &$application) {
$application['applicationid'] = $applicationids[$anum];
if (isset($application['applicationTemplates'])) {
foreach ($application['applicationTemplates'] as $applicationTemplate) {
$applicationTemplates[] = [
'applicationid' => $application['applicationid'],
'templateid' => $applicationTemplate['templateid']
];
}
}
}
unset($application);
// link inherited apps
DB::insertBatch('application_template', $applicationTemplates);
return $applications;
}
/**
* Update applications.
*
* @param array $applications
*
* @return array
*/
public function update(array $applications) {
$update = [];
$applicationTemplates = [];
foreach ($applications as $application) {
if (isset($application['applicationTemplates'])) {
foreach ($application['applicationTemplates'] as $applicationTemplate) {
$applicationTemplates[] = $applicationTemplate;
}
unset($application['applicationTemplates']);
}
$update[] = [
'values' => $application,
'where' => ['applicationid' => $application['applicationid']]
];
}
DB::update('applications', $update);
// replace existing application templates
if ($applicationTemplates) {
$dbApplicationTemplates = DBfetchArray(DBselect(
'SELECT * '.
' FROM application_template at'.
' WHERE '.dbConditionInt('at.applicationid', zbx_objectValues($applications, 'applicationid'))
));
DB::replace('application_template', $dbApplicationTemplates, $applicationTemplates);
}
return $applications;
}
/**
* Link applications in template to hosts.
*
* @param $templateId
* @param $hostIds
*
* @return bool
*/
public function link($templateId, $hostIds) {
$hostIds = zbx_toArray($hostIds);
// fetch template applications
$applications = DBfetchArray(DBselect(
'SELECT a.applicationid,a.name,a.hostid'.
' FROM applications a'.
' WHERE a.hostid='.zbx_dbstr($templateId)
));
$this->inherit($applications, $hostIds);
return true;
}
/**
* Inherit passed applications to hosts.
* If $hostIds is empty that means that we need to inherit all $applications to hosts which are linked to templates
* where $applications belong.
*
* Usual use case is:
* inherit is called with some $hostIds passed
* new applications are created/updated
* inherit is called again with created/updated applications but empty $hostIds
* if any of new applications belongs to template, inherit it to all hosts linked to that template
*
* @param array $applications
* @param array $hostIds
*
* @return bool
*/
public function inherit(array $applications, array $hostIds = []) {
$hostTemplateMap = $this->getChildHostsFromApplications($applications, $hostIds);
if (empty($hostTemplateMap)) {
return true;
}
$hostApps = $this->getApplicationMapsByHostIds(array_keys($hostTemplateMap));
$preparedApps = $this->prepareInheritedApps($applications, $hostTemplateMap, $hostApps);
$inheritedApps = $this->save($preparedApps);
$applications = zbx_toHash($applications, 'applicationid');
// update application linkage
$oldApplicationTemplateIds = [];
$movedAppTemplateIds = [];
$childAppIdsPairs = [];
$oldChildApps = [];
foreach ($inheritedApps as $newChildApp) {
$oldChildAppsByTemplateId = $hostApps[$newChildApp['hostid']]['byTemplateId'];
foreach ($newChildApp['applicationTemplates'] as $applicationTemplate) {
// check if the parent of this application had a different child on the same host
if (isset($oldChildAppsByTemplateId[$applicationTemplate['templateid']])
&& $oldChildAppsByTemplateId[$applicationTemplate['templateid']]['applicationid'] != $newChildApp['applicationid']) {
// if a different child existed, find the template-application link and remove it later
$oldChildApp = $oldChildAppsByTemplateId[$applicationTemplate['templateid']];
$oldApplicationTemplates = zbx_toHash($oldChildApp['applicationTemplates'], 'templateid');
$oldApplicationTemplateIds[] = $oldApplicationTemplates[$applicationTemplate['templateid']]['application_templateid'];
// save the IDs of the affected templates and old
if (isset($applications[$applicationTemplate['templateid']])) {
$movedAppTemplateIds[] = $applications[$applicationTemplate['templateid']]['hostid'];
$childAppIdsPairs[$oldChildApp['applicationid']] = $newChildApp['applicationid'];
}
$oldChildApps[] = $oldChildApp;
}
}
}
// move all items and web scenarios from the old app to the new
if ($childAppIdsPairs) {
$this->moveInheritedItems($movedAppTemplateIds, $childAppIdsPairs);
$this->moveInheritedHttpTests($movedAppTemplateIds, $childAppIdsPairs);
}
// delete old application links
if ($oldApplicationTemplateIds) {
DB::delete('application_template', [
'application_templateid' => $oldApplicationTemplateIds
]);
}
// delete old children that have only one parent
$delAppIds = [];
foreach ($oldChildApps as $app) {
if (count($app['applicationTemplates']) == 1) {
$delAppIds[] = $app['applicationid'];
}
}
if ($delAppIds && $emptyIds = $this->fetchEmptyIds($delAppIds)) {
$this->delete($emptyIds);
}
$this->inherit($inheritedApps);
return true;
}
/**
* Replaces applications for all items inherited from templates $templateIds according to the map given in
* $appIdPairs.
*
* @param array $templateIds
* @param array $appIdPairs an array of source application ID - target application ID pairs
*/
protected function moveInheritedItems(array $templateIds, array $appIdPairs) {
// fetch existing item application links for all items inherited from template $templateIds
$itemApps = DBfetchArray(DBselect(
'SELECT ia2.itemappid,ia2.applicationid,ia2.itemid'.
' FROM items i,items i2,items_applications ia2'.
' WHERE i.itemid=i2.templateid'.
' AND i2.itemid=ia2.itemid'.
' AND '.dbConditionInt('i.hostid', $templateIds).
' AND '.dbConditionInt('ia2.applicationid', array_keys($appIdPairs))
));
// find item application links to target applications that may already exist
$query = DBselect(
'SELECT ia.itemid,ia.applicationid'.
' FROM items_applications ia'.
' WHERE '.dbConditionInt('ia.applicationid', $appIdPairs).
' AND '.dbConditionInt('ia.itemid', zbx_objectValues($itemApps, 'itemid'))
);
$exItemAppIds = [];
while ($row = DBfetch($query)) {
$exItemAppIds[$row['itemid']][$row['applicationid']] = $row['applicationid'];
}
$newAppItems = [];
$delAppItemIds = [];
foreach ($itemApps as $itemApp) {
// if no link to the target app exists, add a new one
if (!isset($exItemAppIds[$itemApp['itemid']][$appIdPairs[$itemApp['applicationid']]])) {
$newAppItems[$appIdPairs[$itemApp['applicationid']]][] = $itemApp['itemappid'];
}
// if the link to the target app already exists, delete the link to the old app
else {
$delAppItemIds[] = $itemApp['itemappid'];
}
}
// link the items to the new apps
foreach ($newAppItems as $targetAppId => $itemAppIds) {
DB::updateByPk('items_applications', $itemAppIds, [
'applicationid' => $targetAppId
]);
}
// delete old item application links
if ($delAppItemIds) {
DB::delete('items_applications', ['itemappid' => $delAppItemIds]);
}
}
/**
* Return IDs of applications that are not used by items or HTTP tests.
*
* @param array $applicationIds
*
* @return array
*/
public function fetchEmptyIds(array $applicationIds) {
return DBfetchColumn(DBselect(
'SELECT a.applicationid '.
' FROM applications a'.
' WHERE '.dbConditionInt('a.applicationid', $applicationIds).
' AND NOT EXISTS (SELECT NULL FROM items_applications ia WHERE a.applicationid=ia.applicationid)'.
' AND NOT EXISTS (SELECT NULL FROM httptest ht WHERE a.applicationid=ht.applicationid)'
), 'applicationid');
}
/**
* Return IDs of applications that are children only (!) of the given parents.
*
* @param array $parentApplicationIds
*
* @return array
*/
public function fetchExclusiveChildIds(array $parentApplicationIds) {
return DBfetchColumn(DBselect(
'SELECT at.applicationid '.
' FROM application_template at'.
' WHERE '.dbConditionInt('at.templateid', $parentApplicationIds).
' AND NOT EXISTS (SELECT NULL FROM application_template at2 WHERE '.
' at.applicationid=at2.applicationid'.
' AND '.dbConditionInt('at2.templateid', $parentApplicationIds, true).
')'
), 'applicationid');
}
/**
* Delete applications.
*
* @param array $applicationIds
*/
public function delete(array $applicationIds) {
// unset applications from http tests
DB::update('httptest', [
'values' => ['applicationid' => null],
'where' => ['applicationid' => $applicationIds]
]);
// remove Monitoring > Latest data toggle profile values related to given applications
DB::delete('profiles', ['idx' => 'web.latest.toggle', 'idx2' => $applicationIds]);
DB::delete('applications', ['applicationid' => $applicationIds]);
}
/**
* Replaces the applications for all http tests inherited from templates $templateIds according to the map given in
* $appIdPairs.
*
* @param array $templateIds
* @param array $appIdPairs an array of source application ID - target application ID pairs
*/
protected function moveInheritedHttpTests(array $templateIds, array $appIdPairs) {
// find all http tests inherited from the given templates and linked to the given applications
$query = DBselect(
'SELECT ht2.applicationid,ht2.httptestid'.
' FROM httptest ht,httptest ht2'.
' WHERE ht.httptestid=ht2.templateid'.
' AND '.dbConditionInt('ht.hostid', $templateIds).
' AND '.dbConditionInt('ht2.applicationid', array_keys($appIdPairs))
);
$targetAppHttpTestIds = [];
while ($row = DBfetch($query)) {
$targetAppHttpTestIds[$appIdPairs[$row['applicationid']]][] = $row['httptestid'];
}
// link the http test to the new apps
foreach ($targetAppHttpTestIds as $targetAppId => $httpTestIds) {
DB::updateByPk('httptest', $httpTestIds, [
'applicationid' => $targetAppId
]);
}
}
/**
* Get array with hosts that are linked with templates which passed applications belongs to as key and
* templateid that host is linked to as value. If second parameter $hostIds is not empty, result should contain
* only passed host IDs.
*
* Example:
* We have template T1 with application A1 and template T1 with application A2 both linked to hosts H1 and H2.
* When we pass A1 to this function it should return array like:
* array(H1_id => array(T1_id, T2_id), H2_id => array(T1_id, T2_id));
*
* @param array $applications
* @param array $hostIds
*
* @return array
*/
protected function getChildHostsFromApplications(array $applications, array $hostIds = []) {
$hostsTemplatesMap = [];
$dbCursor = DBselect(
'SELECT ht.templateid,ht.hostid'.
' FROM hosts_templates ht'.
' WHERE '.dbConditionInt('ht.templateid', zbx_objectValues($applications, 'hostid')).
($hostIds ? ' AND '.dbConditionInt('ht.hostid', $hostIds) : '')
);
while ($dbHost = DBfetch($dbCursor)) {
$hostId = $dbHost['hostid'];
$templateId = $dbHost['templateid'];
if (!isset($hostsTemplatesMap[$hostId])) {
$hostsTemplatesMap[$hostId] = [];
}
$hostsTemplatesMap[$hostId][$templateId] = $templateId;
}
return $hostsTemplatesMap;
}
/**
* Generate application data for inheritance. Using passed parameters, decide if new application must be
* created on host or existing application must be updated.
*
* @param array $applications applications to prepare for inheritance
* @param array $hostsTemplatesMap map of host IDs to templates they are linked to
* @param array $hostApplications array of existing applications on the child host returned by
* self::getApplicationMapsByHostIds()
*
* @return array Return array with applications. Existing applications have "applicationid" key.
*/
protected function prepareInheritedApps(array $applications, array $hostsTemplatesMap, array $hostApplications) {
/*
* This variable holds array of working copies of results, indexed first by host ID (hence pre-filling
* with host IDs from $hostApplications as keys and empty arrays as values), and then by application name.
* For each host ID / application name pair, there is only one array with application data
* with key "applicationTemplates" which is updated, if application with same name is inherited from
* more than one template. In the end this variable gets looped through and plain result array is constructed.
*/
$newApplications = array_fill_keys(array_keys($hostApplications), []);
foreach ($applications as $application) {
$applicationId = $application['applicationid'];
foreach ($hostApplications as $hostId => $hostApplication) {
// If application template is not linked to host, skip it.
if (!isset($hostsTemplatesMap[$hostId][$application['hostid']])) {
continue;
}
if (!isset($newApplications[$hostId][$application['name']])) {
$newApplication = [
'name' => $application['name'],
'hostid' => $hostId,
'applicationTemplates' => []
];
}
else {
$newApplication = $newApplications[$hostId][$application['name']];
}
$existingApplication = null;
/*
* Look for an application with the same name, if one exists - link the parent application to it.
* If no application with the same name exists, look for a child application via "templateid".
* Use it only if it has only one parent. Otherwise a new application must be created.
*/
if (isset($hostApplication['byName'][$application['name']])) {
$existingApplication = $hostApplication['byName'][$application['name']];
}
elseif (isset($hostApplication['byTemplateId'][$applicationId])
&& count($hostApplication['byTemplateId'][$applicationId]['applicationTemplates']) == 1) {
$existingApplication = $hostApplication['byTemplateId'][$applicationId];
}
if ($existingApplication) {
$newApplication['applicationid'] = $existingApplication['applicationid'];
// Add the new template link to an existing child application if it's not present yet.
$newApplication['applicationTemplates'] = isset($existingApplication['applicationTemplates'])
? $existingApplication['applicationTemplates']
: [];
$applicationTemplateIds = zbx_objectValues($newApplication['applicationTemplates'], 'templateid');
if (!in_array($applicationId, $applicationTemplateIds)) {
$newApplication['applicationTemplates'][] = [
'applicationid' => $newApplication['applicationid'],
'templateid' => $applicationId
];
}
}
else {
// If no matching child application exists, add a new one.
$newApplication['applicationTemplates'][] = ['templateid' => $applicationId];
}
// Store new or updated application data so it can be reused.
$newApplications[$hostId][$application['name']] = $newApplication;
}
}
$result = [];
foreach ($newApplications as $hostId => $newApplicationsPerHost) {
foreach ($newApplicationsPerHost as $newApplication) {
$result[] = $newApplication;
}
}
return $result;
}
/**
* Get host applications for each passed host.
* Each host has two hashes with applications, one with name keys other with templateid keys.
*
* Resulting structure is:
* array(
* 'hostid1' => array(
* 'byName' => array(app1data, app2data, ...),
* 'nyTemplateId' => array(app1data, app2data, ...)
* ), ...
* );
*
* @param array $hostIds
*
* @return array
*/
protected function getApplicationMapsByHostIds(array $hostIds) {
$hostApps = [];
foreach ($hostIds as $hostid) {
$hostApps[$hostid] = ['byName' => [], 'byTemplateId' => []];
}
// fetch applications
$applications = DbFetchArrayAssoc(DBselect(
'SELECT a.applicationid,a.name,a.hostid'.
' FROM applications a'.
' WHERE '.dbConditionInt('a.hostid', $hostIds)
), 'applicationid');
$query = DBselect(
'SELECT *'.
' FROM application_template at'.
' WHERE '.dbConditionInt('at.applicationid', array_keys($applications))
);
while ($applicationTemplate = DbFetch($query)) {
$applications[$applicationTemplate['applicationid']]['applicationTemplates'][] = $applicationTemplate;
}
foreach ($applications as $app) {
$hostApps[$app['hostid']]['byName'][$app['name']] = $app;
if (isset($app['applicationTemplates'])) {
foreach ($app['applicationTemplates'] as $applicationTemplate) {
$hostApps[$app['hostid']]['byTemplateId'][$applicationTemplate['templateid']] = $app;
}
}
}
return $hostApps;
}
/**
* Save applications. If application has applicationid it gets updated otherwise a new one is created.
*
* @param array $applications
*
* @return array
*/
protected function save(array $applications) {
$appsCreate = [];
$appsUpdate = [];
foreach ($applications as $key => $app) {
if (isset($app['applicationid'])) {
$appsUpdate[] = $app;
}
else {
$appsCreate[$key] = $app;
}
}
if (!empty($appsCreate)) {
$newApps = $this->create($appsCreate);
foreach ($newApps as $key => $newApp) {
$applications[$key]['applicationid'] = $newApp['applicationid'];
}
}
if (!empty($appsUpdate)) {
$this->update($appsUpdate);
}
return $applications;
}
}
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