Issue: Fatal Error: attempted to instantiate non-existent class vw_Start_Controller

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2 Weeks Ago 4:22 AM

mazzly

Junior Member

Fatal Error: attempted to instantiate non-existent class vw_Start_Controller

Related to https://www.vaultwiki.org/issues/6458/,

Pinned the PHP version to 8.1, which we have in the prod env, and am now getting a new error:

Code:

Fatal Error: attempted to instantiate non-existent class vw_Start_Controller
/home/nginx/domains/foo.com/public/src/addons/vw/vw/_core/controller/start/vw.php does not exist or does not contain the specified class.

#0: vw_Hard_Core::fetch_object() in [vw-platform]/src/addons/vw/vw/_hard/core.php at line 907
#1: vw_Hard_Core::controller() in [vw-platform]/src/addons/vw/vw/Core.php at line 52
#2: vw\vw\Core::init() in [vw-platform]/src/addons/vw/vw/Listener.php at line 57
#3: vw\vw\Listener::app_setup() in [vw-platform]/src/XF/Extension.php at line 81
#4: XF\Extension->fire() in [vw-platform]/src/XF/App.php at line 2994
#5: XF\App->fire() in [vw-platform]/src/XF/App.php at line 2032
#6: XF\App->setup() in [vw-platform]/src/XF/Admin/App.php at line 56
#7: XF\Admin\App->setup() in [vw-platform]/src/XF.php at line 497
#8: XF::setupApp() in [vw-platform]/src/XF.php at line 520
#9: XF::runApp() in [vw-platform]/admin.php at line 13

For some reason, it tries to load files from the path of the production server, although we are running this inside a local docker.

Issue Details

Issue Number 6459

Issue Type Bug

Project VaultWiki 4.x Series

Category Unknown

Status Fixed

Priority 2 - Fatal / Database Errors

Affected Version Unknown

Fixed Version (none)

Milestone (none)

Software DependencyAny

License TypePaid

Users able to reproduce bug 0

Users unable to reproduce bug 0

Attachments 0

Assigned Users (none)

Tags (none)

1 Week Ago 7:43 PM

pegasus

VaultWiki Team

Most likely you have hardcoded your paths in a file somewhere which you have duplicated to docker.

The default values for various paths are defined in src/addons/vw/vw/Helper/Paths.php. You were at least able to resolve the _hard/core.php file, so VW_HARD_PATH is being found automatically. By the looks of it, you have either hardcoded VW_DEPOT_PATH or VW_CORE_PATH.
The first place that comes to mind where you may have hardcoded it is the VW_DEPOT_PATH in src/addons/vw/vw/config.php.

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5 Days Ago 4:42 AM

mazzly

Junior Member

Nowhere in the code is that /home/nginx/... path found... And I also tried looking if the addon folders would have some symlinks but couldn't find anything...

Could these references be cached somewhere? Or stored in db?

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5 Days Ago 4:51 AM

mazzly

Junior Member

I also tried setting calling \XF::dump($path) in those places where VW_HARD_PATH, VW_DEPOT_PATH & VW_CORE_PATH are defined, and they are all correct... So, I guess that value is set wrong somewhere else?

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5 Days Ago 4:59 AM

mazzly

Junior Member

Turns out that

self::locate_class($type, $classname, $file, $dependency);

Returns the wrong file path for some classes... Dunno why, any ideas?

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4 Days Ago 3:31 PM
pegasus

VaultWiki Team
If this is a database restored from a backup on a different server, I see that it would be useful to expire the class cache or make it more agnostic to the base directory.

I also see that the current expiration logic may be flawed. In src/addons/vw/vw/_hard/core.php, find:

Code:

if ($cached AND $cached['expires'] < microtime(true))

Replace with:

Code:

if ($cached AND $cached['expires'] > microtime(true))

I believe this was using the cache if it was outdated, but if it wasn't outdated it wasn't using the cache. This would normally result in the cache never being used, but if you restored from a backup that was older than the cache lifetime, or if your site was especially inactive, this could result in actually using the stale cache.
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4 Days Ago 3:57 PM

pegasus

VaultWiki Team

Fixed in the next patch. Beginning with the patch, the cache will now be agnostic as to the path prefix containing the class location. Rather, the cache will store which path should be used, rather than the value of the path, e.g. "VW_CORE_PATH" rather than what VW_CORE_PATH points to. Also the cache expiry is fixed per my previous post.

With this change, the cache should now be portable across different systems if restoring from a backup on a different system, such as for server migrations, or creating test installations.

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2 Days Ago 2:33 AM

mazzly

Junior Member

Getting further... I was now able to open the local site, but it still throws an error (even after disabling vw/vw through the XF CLI).

Code:

ErrorException: [E_WARNING] require_once(/home/nginx/domains/....com/public/src/addons/vw/vw/_core/model/marker/vw.php): Failed to open stream: No such file or directory in src/addons/vw/vw/_hard/core.php at line 777
XF::handlePhpError() in src/addons/vw/vw/_hard/core.php at line 777
require_once() in src/addons/vw/vw/_hard/core.php at line 777
vw_Hard_Core::locate_class() in src/addons/vw/vw/_hard/core.php at line 402
vw_Hard_Core::fetch_object() in src/addons/vw/vw/_hard/core.php at line 892
vw_Hard_Core::model() in src/addons/vw/vw/_core/controller/fetch/page/vw.php at line 432
vw_Fetch_Page_Controller->stack_info() in src/addons/vw/vw/_core/controller/fetch/page/xf0.php at line 19
vw_Fetch_Page_Controller_XF0->stack_info() in src/addons/vw/vw/_core/controller/fetch/stack/vw.php at line 150
vw_Fetch_Stack_Controller->build_query() in src/addons/vw/vw/_core/controller/fetch/stack/vw.php at line 129
vw_Fetch_Stack_Controller->query() in src/addons/vw/vw/_core/controller/fetch/vw.php at line 615
vw_Fetch_Controller->query() in src/addons/vw/vw/_core/controller/fetch/vw.php at line 456
vw_Fetch_Controller->get() in src/addons/vw/vw/_core/controller/fetch/vw.php at line 295
vw_Fetch_Controller->get_by_route() in src/addons/vw/vw/Entity/Integrate.php at line 26
vw\vw\Entity\Integrate->canView() in src/XF/Entity/Node.php at line 54
XF\Entity\Node->canView() in src/XF/Mvc/Entity/AbstractCollection.php at line 328
XF\Mvc\Entity\AbstractCollection->XF\Mvc\Entity\{closure}()
array_filter() in src/XF/Mvc/Entity/AbstractCollection.php at line 197
XF\Mvc\Entity\AbstractCollection->filter() in src/XF/Mvc/Entity/AbstractCollection.php at line 329
XF\Mvc\Entity\AbstractCollection->filterViewable() in src/XF/Repository/Node.php at line 161
XF\Repository\Node->filterViewable() in src/XF/Repository/Node.php at line 22
XF\Repository\Node->getNodeList() in src/XF/Pub/Controller/Forum.php at line 54
XF\Pub\Controller\Forum->actionList() in src/addons/MaZ/AMP/XF/Pub/Controller/Forum.php at line 33
MaZ\AMP\XF\Pub\Controller\Forum->actionList() in src/XF/Mvc/Dispatcher.php at line 352
XF\Mvc\Dispatcher->dispatchClass() in src/XF/Mvc/Dispatcher.php at line 259
XF\Mvc\Dispatcher->dispatchFromMatch() in src/XF/Mvc/Dispatcher.php at line 115
XF\Mvc\Dispatcher->dispatchLoop() in src/XF/Mvc/Dispatcher.php at line 57
XF\Mvc\Dispatcher->run() in src/XF/App.php at line 2487
XF\App->run() in src/XF.php at line 524
XF::runApp() in index.php at line 20

1 Day Ago 11:36 AM
pegasus

VaultWiki Team
Okay, I see what is happening now. When the cache expires, it is not actually completely deleted. So leftover portions of the stale cache can still be used after the cache is updated again. The easiest way to get around this for now is just to manually delete the caches, as we'll have to redesign some of the logic so that it completely clears on expiration.

Run the following MySQL queries:

Code:

DELETE FROM xf_data_registry WHERE data_key IN ('vw_class_cache', 'vw_file_cache')

Code:

TRUNCATE TABLE xf_vw_accelerate

More notes: From what I am seeing in the code, the only way you would even have an existing cache with this issue, is if you freshly installed (not upgraded) VaultWiki using 4.1.7, then used it for a bit, then cloned that installation. Are you aware of another usage pattern that you might have performed?
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Issue: Fatal Error: attempted to instantiate non-existent class vw_Start_Controller

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