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From "Nick Richards (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CB-1316) Lose contents of localStorage if backed up while Journal emptying: "Error: database disk image is malformed"
Date Thu, 30 Aug 2012 23:49:07 GMT

     [ https://issues.apache.org/jira/browse/CB-1316?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nick Richards updated CB-1316:
------------------------------

    Description: 
The v1.6.1 workaround/fix CB-330 for iOS 5.1's localStorage iCloud-related file-deletion allows
me to use localStorage in my app.  However localStorage is sporadically and thereafter persistently
blank when I relaunch my application.  

Further, when I Download the application via Xcode Organizer to my Mac and open it using SQLITE3
the database is reported to be corrupt: "Error: database disk image is malformed" is what
sqlite says.  This is seen in (xcappdata)/AppData/Documents/Backups/localstorage.appdata.db
as well as AppData/Library/Caches/file__0.localstorage, after an app exit and restart.  Sometimes
I must time things to rapidly exit after using localStorage in the app (writing to the database)
for this situation to occur.  Also my application is set to exit when the user backgrounds
it, via the info.plist "Application does not run in background" (aka UIApplicationExitsOnSuspend
= YES) setting.

I expect the localStorage DB to not be corrupted / blank when I resume my application.

I once saw a SQLITE DB Journal file show up: AppData/Library/Caches/file__0.localstorage.journal
in Xcode's Organizer window while I was using my app.  This got me thinking that Cordova's
https://github.com/apache/incubator-cordova-ios/blob/master/CordovaLib/Classes/CDVLocalStorage.m
CB-330 implementation needs a tweak:  wait to perform the backup until after the Journal file
has been written.  I figure if Cordova backs-up the database while the Journal is still being
emptied then we'll get a corrupted localStorage!

Thank you,
Nick

  was:
The v1.6.1 workaround/fix CB-330 for iOS 5.1's localStorage iCloud-related file-deletion allows
me to use localStorage in my app.  However localStorage is sporadically and thereafter persistently
blank when I relaunch my application.  

Further, when I Download the application via Xcode Organizer to my Mac and open it using SQLITE3
the database is reported to be corrupt: "Error: database disk image is malformed" is what
sqlite says.  This is seen in (xcappdata)/AppData/Documents/Backups/localstorage.appdata.db
as well as AppData/Library/Caches/file__0.localstorage, after an app exit and restart.  Sometimes
I must time things to rapidly exit after writing to the database for this situation to occur.
 Also my application is set to exit when the user backgrounds it, via the info.plist "Application
does not run in background" (aka UIApplicationExitsOnSuspend = YES) setting.

I expect the localStorage DB to not be corrupted / blank when I resume my application.

I once saw a SQLITE DB Journal file show up: AppData/Library/Caches/file__0.localstorage.journal
in Xcode's Organizer window while I was using my app.  This got me thinking that Cordova's
https://github.com/apache/incubator-cordova-ios/blob/master/CordovaLib/Classes/CDVLocalStorage.m
CB-330 implementation needs a tweak:  wait to perform the backup until after the Journal file
has been written.  I figure if Cordova backs-up the database while the Journal is still being
emptied then we'll get a corrupted localStorage!

Thank you,
Nick

    
> Lose contents of localStorage if backed up while Journal emptying: "Error: database disk
image is malformed"
> ------------------------------------------------------------------------------------------------------------
>
>                 Key: CB-1316
>                 URL: https://issues.apache.org/jira/browse/CB-1316
>             Project: Apache Cordova
>          Issue Type: Bug
>    Affects Versions: 1.8.1
>         Environment: iOS 5.1+
>            Reporter: Nick Richards
>            Priority: Critical
>              Labels: database, ios5.1, localstorage
>
> The v1.6.1 workaround/fix CB-330 for iOS 5.1's localStorage iCloud-related file-deletion
allows me to use localStorage in my app.  However localStorage is sporadically and thereafter
persistently blank when I relaunch my application.  
> Further, when I Download the application via Xcode Organizer to my Mac and open it using
SQLITE3 the database is reported to be corrupt: "Error: database disk image is malformed"
is what sqlite says.  This is seen in (xcappdata)/AppData/Documents/Backups/localstorage.appdata.db
as well as AppData/Library/Caches/file__0.localstorage, after an app exit and restart.  Sometimes
I must time things to rapidly exit after using localStorage in the app (writing to the database)
for this situation to occur.  Also my application is set to exit when the user backgrounds
it, via the info.plist "Application does not run in background" (aka UIApplicationExitsOnSuspend
= YES) setting.
> I expect the localStorage DB to not be corrupted / blank when I resume my application.
> I once saw a SQLITE DB Journal file show up: AppData/Library/Caches/file__0.localstorage.journal
in Xcode's Organizer window while I was using my app.  This got me thinking that Cordova's
https://github.com/apache/incubator-cordova-ios/blob/master/CordovaLib/Classes/CDVLocalStorage.m
CB-330 implementation needs a tweak:  wait to perform the backup until after the Journal file
has been written.  I figure if Cordova backs-up the database while the Journal is still being
emptied then we'll get a corrupted localStorage!
> Thank you,
> Nick

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