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| TresEquis | hannosch: PAS was written for 2.7.0 originally | 00:14 |
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| hannosch | TresEquis: aha :) I've started at Zope 2.5 or so... been there but I don't remember the details anymore | 00:16 |
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| TresEquis | vezult: you might have to go back in time a bit to find a version of PAS compatible with Zope 2.7.0 | 00:24 |
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| newbery | does anyone know why OFS.Image.Image starts a stream download directly with response.write instead of just using a bodyproducer like blobs and FSImage? | 11:26 |
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| TheJester | It predates FSImage by 20 years... | 11:33 |
| newbery | right... just wondering if this was retained for a reason? Otherwise, I would like to fix it as it messes with the Publisher events | 11:34 |
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| moo--- | newbery: Can you give me any pointers how to stream fles out of Zope instead of buffering them memory? I need that functionality also. | 12:03 |
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| newbery | moo---: sorry, was afk | 12:55 |
| newbery | moo---: just getting a handle on it myself... | 12:55 |
| newbery | moo---: there looks like two ways... old way and new way... but maybe the old way is retained for some reason. I'm not sure | 12:56 |
| newbery | the new way... is where your response contains an outputBody method by the time it reaches line 252 in Publish.py | 12:57 |
| moo--- | ok | 13:00 |
| moo--- | newbery: and outputbody() is supposed to call response.write? | 13:01 |
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| newbery | moo---: no, response.write seems to be the "old" way. response.write writes to stdout and so does outputBody, but the second does it later in the process after the new Publish events. | 13:05 |
| moo--- | newbery: outputBody() itself does not do anything... it needs still some way to "generate" the response | 13:05 |
| moo--- | darn I hope there would a good doc about this | 13:05 |
| newbery | right... hence the bodyproducer bit... which I'm still working through | 13:06 |
| moo--- | newbery: drop me a word when you figure it out | 13:06 |
| newbery | no prob... I think I'm drafting this into a question for the zope email list | 13:07 |
| newbery | moo---: basically you can see the key methods in ZServer.HTTPResponse.outputBody() and ...setBody(). The setBody will attach a stream iterator if the body provides IStreamIterator | 13:15 |
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| newbery | now that a different timezone is up, I'm reposting a question from last night... | 23:11 |
| newbery | does anyone know why OFS.Image.Image starts a stream download directly with response.write instead of just using a bodyproducer stream iterator like blobs and FSImage? | 23:12 |
| newbery | at least the Plone 4 FSImage.... the older one still uses OFS.Image | 23:12 |
| newbery | probably because the new one is also a blob | 23:13 |
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| mcdonc | newbery: ooh i know the answer! | 23:27 |
| newbery | i figured you might :-) | 23:27 |
| mcdonc | when blobs are used, the system doesn't rely on zodb for the data | 23:27 |
| mcdonc | its on the filesystem | 23:27 |
| mcdonc | when you return a stream iterator to zserver, the publisher believes its job is done, and it closes the zodb connection | 23:28 |
| newbery | ahh | 23:28 |
| mcdonc | that cant work for objects in the zodb of course | 23:28 |
| newbery | damn... the early response.write doesn't trigger a publisher event so it doesn't look like I can hook in something right before delivery like I can do everything else :( | 23:30 |
| newbery | does this call for another event inside the write function? | 23:30 |
| mcdonc | i rewrote this for a reason ;-) | 23:30 |
| mcdonc | newbery: it calls for.. something.. that something might be a redesign | 23:31 |
| newbery | a redesign of publisher? or ofs.image? | 23:31 |
| mcdonc | either? both? ... what are you actually trying to have it do before every response? | 23:32 |
| newbery | plone.app.caching hooks into PubBeforeCommit in order to write it's headers... doesn't work with these.... also screws up with large CSS/JS from the resource registry as they become Pdata objects, which gets the same treatment | 23:34 |
| mcdonc | in the post-wsgi world, this would likely be done via middleware | 23:34 |
| mcdonc | i realize that doesn't help without a lot of pain | 23:35 |
| newbery | what do you think of adding a new Publish event.... say something like PubBeforeStream? | 23:36 |
| mcdonc | i'm not really a user of that code anymore.. but in general... adding code there is the traditional way things have been done... as horrifying as the result is ;-) | 23:36 |
| newbery | i'm not horrified... but my threshold for horror is pretty high ;-) | 23:38 |
| mcdonc | i dunno about PubBeforeStream... i mean | 23:38 |
| mcdonc | really | 23:38 |
| mcdonc | i think maybe p.a.caching should use a different event | 23:38 |
| mcdonc | to hook | 23:38 |
| newbery | suggestions? | 23:38 |
| mcdonc | because the commit event is not really quite right | 23:38 |
| mcdonc | no.. | 23:39 |
| mcdonc | i have no suggestions | 23:39 |
| mcdonc | its not writtten right | 23:39 |
| mcdonc | cant fix design crap through software i fear | 23:39 |
| mcdonc | so.. yup, another event shall be added and everyone will be happy ;-) | 23:40 |
| newbery | alright... making people happy is all that matters | 23:40 |
| mcdonc | here's how i think it should work | 23:41 |
| mcdonc | rather than p.a.caching setting headers | 23:41 |
| mcdonc | content types should *ask* a cache policy about which kinds of headers to set | 23:41 |
| mcdonc | and the content type should set it itself | 23:41 |
| mcdonc | while being served | 23:41 |
| newbery | sounds like a cool design but... would also need something similar for simple template views, browser views/pages, zope 3 resources, etc... that's sound suspiciously like a nasty rat hole | 23:43 |
| mcdonc | yup... might as well start all over... | 23:44 |
| newbery | hmm... if only there was a framework to start all over with... ;-) | 23:44 |
| mcdonc | yeah... ah well. ;-) | 23:47 |
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| newbery | okay... well, we plays with whom we brought. The p.a.caching way may be non-optimal design-wise but it's much better than Cachefu and it works pretty well... except for this last bit | 23:47 |
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| mcdonc | yeah.. unfortunately once you start streaming you cant set headers any longer | 23:49 |
| mcdonc | so hooking header setting needs to happen slightly earlier i guess | 23:50 |
| mcdonc | and if no suitable event exists, i guess adding one isnt the worst thing in the world | 23:50 |
| newbery | damn... and I really thought I could finish this without monkeypatching | 23:50 |
| mcdonc | impossible ;-) | 23:52 |
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