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jtm Smarty Rookie
Joined: 13 Nov 2003 Posts: 9
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Posted: Thu Nov 13, 2003 1:32 pm Post subject: Falling back to cache on error |
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I'm getting some data from a database which I then insert to a template.
I'm also using $smarty->caching = 1; so the page is cached and everything works fine.
But, when the cache expires, the php connects to the database but what if the database is down or there is some other error which prevents getting the critical data which needs to be inserted to the template? Is there any way to force smarty to use the old cache even if it's expired?
Think about the following pseudo code:
Code: |
$smarty->caching = 1;
if (! $smarty->is_cached(...)) {
// The cache is expired, get some data from a database, assing
// template variables etc so that the page is regenerated
...
if ( database is down) {
force smarty to use the old cache file
}
}
$smarty->display("template.tpl");
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Thanks in advice! =)
- jtm |
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messju Administrator
Joined: 16 Apr 2003 Posts: 3336 Location: Oldenburg, Germany
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Posted: Thu Nov 13, 2003 3:09 pm Post subject: Re: Falling back to cache on error |
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Code: |
$smarty->caching = 1;
if (! $smarty->is_cached(...)) {
// The cache is expired, get some data from a database, assing
// template variables etc so that the page is regenerated
...
if ( database is down) {
$smarty->cache_lifetime = -1;
if ($smarty->is_cached(...)) {
// there is an old cached version
} else {
// fatal error
}
}
}
$smarty->display("template.tpl");
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jtm Smarty Rookie
Joined: 13 Nov 2003 Posts: 9
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Posted: Thu Nov 13, 2003 5:41 pm Post subject: |
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That looked great but I've come cross to another problem.
As seen in thread http://www.phpinsider.com/smarty-forum/viewtopic.php?t=1343&start=0, there's a block function which did a bit the same.
I figured that I'd need something like a {cache} ... {/cache} block function which would also check if code inside would set some error template variable to true which would force the cache to use the old file.
The code which boots posted there did nearly that. The only drawback is that I don't need subtemplates here, I just need to cache the data inside those {cache} tags. It would look dumb if I just create a template which have nothing but one $insert_data_here variable. How can I create cache files by myself in a block function so that I can also use is_cached etc functions to check if they still are valid etc? |
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boots Administrator
Joined: 16 Apr 2003 Posts: 5611 Location: Toronto, Canada
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Posted: Thu Nov 13, 2003 5:52 pm Post subject: |
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hi jtm.
First off, messju's solution above is very nice
On to your last comments: I'm not sure if the plugin I proposed does exactly what you say. Just to be clear, though, it does not require you to create subtemplates--the plugin literally creates the subtemplate based on the block.
So if your template was index.tpl and you had the following block in that template:
Code: | {sec template=$smarty.template id=test group="abc" ttl=300}
blah
{/sec} |
the plugin will automagically write a new template into your template directory called index.tpl.test. It then includes the subtemplate which "compiles" it (which is superfluous in this case, IMO) and caches it.
Note that once the subtemplate is created, nothing prevents you from using it elsewhere using a normal inlclude. Of course, the outcomes will be less predictible so I'm not sure that it is a wonderful idea, but it has its interesting qualities and if managed well, can be quite useful, I think.
You may be able to use that plugin as a starting point for your needs. If you do such a thing, please post your results
At this point, I have no real intention to support it and there are several caveats (some mentioned in the thread you linked). For example, the resource api does not support writing templates so don't bother using this plugin for resource based templates. |
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jtm Smarty Rookie
Joined: 13 Nov 2003 Posts: 9
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Posted: Mon Nov 17, 2003 9:51 am Post subject: |
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I tried the code but I'm not quite satisfacted with the results.
It seems that smarty can't search template files from multiple source directories. I have one directory where my templates resists (which I have manually wrote) and I don't want templates, which are created by this {sec} block directove, to be created in the same directory.
I can easily modify the sec block handler to create the template files to a different directory but I can't make smarty look them from there. Any suggestions?
I also think that it could work better if the sec block directive could just store the data inside the block to a cache file, without using templates in the middle. Is this possible? can a plugin create cache files on it's own so that they can be used with is_cached etc?
EDIT: After a short discussion with messju in the IRC, I think that I got the right way to do this. I'll post my results later =)
- jtm |
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boots Administrator
Joined: 16 Apr 2003 Posts: 5611 Location: Toronto, Canada
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Posted: Mon Nov 17, 2003 3:16 pm Post subject: |
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jtm-- heh, yeah, it is definately not a fully developed solution. If you have improvements, I'd appreciate you posting them You may also consider posting them into the original thread if you think they are appropriate for others trying to solve atu's original query.
Cheers! |
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