[web-devel] juliusFile in yesod 0.8 eating all memory

[Michael Snoyman]

On Fri, Apr 29, 2011 at 5:32 PM, JP Moresmau <jpmoresmau at gmail.com> wrote:
> Right, found it.
>
>>>> instance (ToJSON a)=> ToJavascript a where
>>>>       toJavascript =toJavascript . toJSON
>
> That used to work but now seems to go into an infinite loop. I've
> replaced it by:
>
> instance (ToJSON a)=> ToJavascript a where
>       toJavascript =fromLazyText . decodeUtf8  . encode . toJSON

Unfortunately, that's the best we can do here, since Javascript only
works with Text, and aeson only works with ByteString.

> and everything works again. Not very elegant, have I missed something?
> Shouldn't that instance be part of Yesod somewhere? I mean if we
> standardize on Aeson, and we want variables in Javascript, it makes
> sense to serialize ToJSON instances in a Julius template.

Good catch, it's supposed to be in yesod-json, but it's commented out
right now. It was probably part of the changeover from json-types to
aeson and got forgotten. I'm not a huge fan of the placement of this
instance (it *is* an orphan), but the alternative is adding aeson as a
dependency to hamlet.

Michael

> JP
>
> On Fri, Apr 29, 2011 at 4:06 PM, JP Moresmau <jpmoresmau at gmail.com> wrote:
>> juliusFile, I'm not running any scaffolded site, I've built everything
>> with 1s and 0s. (-:
>> Changing to juliusFileDebug results in the same behavior.
>>
>> JP
>>
>> On Fri, Apr 29, 2011 at 3:56 PM, Michael Snoyman <michael at snoyman.com> wrote:
>>> Are you running juliusFile or juliusFileDebug? (The scaffolded site
>>> uses the latter by default.)
>>>
>>> Michael
>>>
>>> On Fri, Apr 29, 2011 at 4:52 PM, JP Moresmau <jpmoresmau at gmail.com> wrote:
>>>> Hi all,
>>>>
>>>> I've just upgraded to Yesod 0.8. I've changed all my Strings into
>>>> Texts, and all my Data.JSON.Types into Data.Aeson.Types. I use these
>>>> JSON objects in julius templates, by adding the orphan instance:
>>>> instance (ToJSON a)=> ToJavascript a where
>>>>       toJavascript =toJavascript . toJSON
>>>>
>>>> (Removing that instance causes compilation error, and I had it when I
>>>> was using json-types).
>>>> addJulius works fine when it contains Javascript code. However on one
>>>> page I use juliusFile to load an external template. This eats all my
>>>> memory and never returns under Warp when I launch the compiled exe (I
>>>> see "thread killed" messages in the console, though), and in GHCi
>>>> crashes with "out of memory".
>>>> The code hasn't changed and was working fine in yesod 0.7 before the
>>>> upgrade. If I remove juliusFile the page displays instantly.
>>>>
>>>> Any idea? I'm a bit stumped. I suppose I'm going to remove each of my
>>>> variables in the julius file to narrow it down, but if anybody has any
>>>> insight...
>>>>
>>>> Thanks!
>>>>
>>>> --
>>>> JP Moresmau
>>>> http://jpmoresmau.blogspot.com/
>>>>
>>>> _______________________________________________
>>>> web-devel mailing list
>>>> web-devel at haskell.org
>>>> http://www.haskell.org/mailman/listinfo/web-devel
>>>>
>>>
>>
>>
>>
>> --
>> JP Moresmau
>> http://jpmoresmau.blogspot.com/
>>
>
>
>
> --
> JP Moresmau
> http://jpmoresmau.blogspot.com/
>