[imp] Horde cache problem

[Jan Schneider]

Zitat von Jochen Roderburg <Roderburg at Uni-Koeln.DE>:

> Zitat von lst_hoe02 at kwsoft.de:
>
>> Zitat von Jochen Roderburg <Roderburg at Uni-Koeln.DE>:
>>
>>> When I have a running webmail session with activated Horde cache  
>>> and  another mail program is changing something on the mail  
>>> server, the  changes are not reflected on the webmail side.
>>>
>>
>> At least for IMAP folders this is documented:
>>
>> [cache_folders]
>> If set to true, note that any folders created on the server during  
>> an  IMP session that are NOT created via IMP will not be displayed  
>> until  the next login. If IMP will be the exclusive means of  
>> accessing the  mail server, or you are not concerned about this  
>> behavior, this  setting should be set to true.
>
> Yes, I have seen and understood this particular case and have  
> decided that I am "not concerned about this behavior".
>
>> But for message status, delete, new etc. it's working fine here  
>> with  Cyrus as IMAP server and parallel access with Thunderbird  
>> (IMAP) and  IMP/Horde. You have to wait for refresh for sure but  
>> this is standard  IMAP behavior.
>
> These are the cases that trouble me.
>
> When I read now that this works in your installation and see no  
> warnings in the configuration dialogs, I think it is really the  
> correct intended behaviour that changes on the mailserver are shown  
> and I have a "special" problem here. General experience says then  
> that in such strange cases the real cause is "something completely  
> different".
>
> A test scenario here:
>
> "Old" IMP (Horde2/IMP3)
> "New" IMP (Horde3/IMP4) with activated Horde cache
> Thunderbird 3.1
>
> When I sent a new mail to my account, it is shown in all three  
> candidates. In Thunderbird immediately, in the IMP's after a (manual  
> or automatic) refresh of the mailbox list.
>
> I delete the mail now in the Old IMP (IMAP delete) and it is shown  
> there as deleted. In Thunderbird it is also immediately shown as  
> deleted. In the New IMP
> it is *not* shown as deleted, and I do not find a way to persuade it  
> to display this correctly. No webmail refreshes help, no Browser  
> refreshes. I can logout and re-login. I can login on different  
> systems with different browsers, everywhere it is displayed as not  
> deleted. It even survives a complete server restart.

This is expected behavior. Due to limitations in the PHP imap  
extension, IMAP flag changes outside of IMP can't be detected when  
using either "msgcache" or "mlistcache" in the IMP configuration. I  
can't remember which one.

> The only way I found to get rid of the situation is to deactivate  
> the Horde cache or clear the cache storage (memcached meanwhile).
>
> Can anybody tell me how this whole thing is supposed to work  
> internally? How does IMP find out that something has changed on the  
> IMAP server and its cached version is no longer valid?
>
> Best Regards,
> Jochen Roderburg
>
>
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Jan.

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