Is there a way to run a server-side command (or a PHP/AJAX function) when 504 error occurs?

[tukusejssirs]

@nao-pon, I need to manage many SMB shares (from Windows mounted on Linux server) for many users via a local website (all shares are available for all users), therefore I opted to mount the shares directly on the server and then add them as simple local storage in elFinder. All those shares should be permanent unless the remote (Windows) is down.

The only issue I currently experience is that when the machine goes offline, it tooks elFinder several seconds (10+ seconds) to notice this and then the following error shows up:

Invalid backend response.
Error occurred on the server side.
HTTP error 504

Is there a way to run a command (or a PHP/AJAX function) on the server when this error occurs? Then I’d destroy the elFinder instance and create a new one.

Thanks for the help!

[mguinness]

A quick and dirty way would be to use jQuery .ajaxError() to catch 504 Gateway Timeout.

[tukusejssirs]

Thanks for the answer @mguinness, I still need to find some time to try and implement your suggestion. That said it looks promising. 😉

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Here are some (more or less) related issues:

• Invalid backend response. Error occurred on the server side. HTTP error 500 #2351 (504 error)
• Is elFinder streaming files when clicking on a folder? #2328 (loading metadata of many files is quite slow and outputs 504);
• Unable to connect to backend. HTTP error 504 #1908 (creating a large archive is very slow and outputs 504);
• Failure on Backend connector when sending long query string (delete/copy multiple selection) #3282 (long query string).

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A partially OT questions: is there a way to make elFinder change the max_execution_time (generally: allow unlimited execution time for a particular process/function/whatever) when needed? I wouldn’t like to set it globally, just when needed (I already to this with other pages in a website where I use elFinder, but this does not work for elFinder for me for some reason).

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Update: Could elFinder query files and their metadata async’ly? That is as soon the metadata of a file are gathered, the file is shown in the UI. Also when the execution time limit is approaching, elFinder should start the gathering again (of course not quering files of which we already gathered the metadata).

Update 2: Can elFinder (or I) use set-time-limit together with checking if it is near the time limit, when it should be reset?

[nao-pon]

There are the following items as options to know the changes on the file system.

elFinder/php/elFinderVolumeDriver.class.php

Lines 468 to 486 in 1b9707c

	// Is support parent directory time stamp update on add|remove|rename item
	// Default `null` is auto detection that is LocalFileSystem, FTP or Dropbox are `true`
	'syncChkAsTs' => null,
	// Long pooling sync checker function for syncChkAsTs is true
	// Calls with args (TARGET DIRCTORY PATH, STAND-BY(sec), OLD TIMESTAMP, VOLUME DRIVER INSTANCE, ELFINDER INSTANCE)
	// This function must return the following values. Changed: New Timestamp or Same: Old Timestamp or Error: false
	// Default `null` is try use elFinderVolumeLocalFileSystem::localFileSystemInotify() on LocalFileSystem driver
	// another driver use elFinder stat() checker
	'syncCheckFunc' => null,
	// Long polling sync stand-by time (sec)
	'plStandby' => 30,
	// Sleep time (sec) for elFinder stat() checker (syncChkAsTs is true)
	'tsPlSleep' => 10,
	// Sleep time (sec) for elFinder ls() checker (syncChkAsTs is false)
	'lsPlSleep' => 30,
	// Client side sync interval minimum (ms)
	// Default `null` is auto set to ('tsPlSleep' or 'lsPlSleep') * 1000
	// `0` to disable auto sync
	'syncMinMs' => null,

[nao-pon]

@tukusejssirs You can extend the execution time by calling elFinder::checkAborted(); on PHP. If you are iterating, you can call it appropriately to prevent timeouts.

However, be aware that PHP does not control timeouts other than max_execution_time for Nginx servers.