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From Zachary Zolton <zachary.zol...@gmail.com>
Subject Re: Redirect from _list function?
Date Mon, 28 Sep 2009 20:16:21 GMT
I've posted a patch from my experiments to the ticket. I'm thinking
this'll require some Erlang-fu...?

Try not to laugh! ;^)

On Mon, Sep 28, 2009 at 1:59 PM, Chris Anderson <jchris@apache.org> wrote:
> On Mon, Sep 28, 2009 at 11:34 AM, Zachary Zolton
> <zachary.zolton@gmail.com> wrote:
>> Guys,
>>
>> I've started a ticket for this:
>> https://issues.apache.org/jira/browse/COUCHDB-514
>>
>> I don't know what level of effort would be required to fix this, or if
>> this is even compatible with the current view server protocol. I'm
>> motivated to solve this, but I'd need some coaching from someone with
>> more knowledge of CouchDB view server internals.
>>
>
> I'm into getting this to happen too. I barely have time, but I can advise.
>
> It wouldn't hurt to post a patch of what you tried, even if it didn;t
> work, as it will let other know which code you are digging into.
>
> Chris
>
>>
>> Cheers,
>>
>> Zach
>>
>>
>> On Sun, Sep 27, 2009 at 11:35 PM, Chris Anderson <jchris@apache.org> wrote:
>>> On Sun, Sep 27, 2009 at 8:26 PM, Zachary Zolton
>>> <zachary.zolton@gmail.com> wrote:
>>>> Hmm... I can't do anything that doesn't result in a view server timeout.
(^_-)
>>>>
>>>> Shall I open an issue? I can discuss what I tried, as well...
>>>>
>>>
>>> It never hurts to start a ticket. Especially if you have patches.
>>>
>>> Thinking about it more, it seems like the Erlang side is gonna be
>>> looking for that start signal before it will send a row. We'll need to
>>> design a dont-start signal, so that it can get a row without sending
>>> headers.
>>>
>>>> On Sun, Sep 27, 2009 at 12:06 PM, Paul Davis
>>>> <paul.joseph.davis@gmail.com> wrote:
>>>>> On Sun, Sep 27, 2009 at 1:04 PM, Zachary Zolton
>>>>> <zachary.zolton@gmail.com> wrote:
>>>>>> Hey guys, newb question for you: the make script concatenates all
the
>>>>>> /share/server/*.js scripts into main.js, right?
>>>>>>
>>>>>
>>>>> yepper.
>>>>>
>>>>>> I'm still trying to figure this stuff out...
>>>>>>
>>>>>> On Sat, Sep 26, 2009 at 11:35 PM, Zachary Zolton
>>>>>> <zachary.zolton@gmail.com> wrote:
>>>>>>> I'll start studying the query_server_spec.rb script; I think
I might
>>>>>>> be able to handle this in JavaScript...
>>>>>>>
>>>>>>> On Sat, Sep 26, 2009 at 11:22 PM, Chris Anderson <jchris@apache.org>
wrote:
>>>>>>>> On Sat, Sep 26, 2009 at 8:57 PM, Paul Davis <paul.joseph.davis@gmail.com>
wrote:
>>>>>>>>> its been awhile since i studied the Erlang side of this,
but IIRC,
>>>>>>>>> once getRow() returns, the response has started which
means that you
>>>>>>>>> can't send a redirect. To get it working proper then
would require a
>>>>>>>>> bit of a patch to wait on starting the response until
the first output
>>>>>>>>> from the _list function.
>>>>>>>>>
>>>>>>>>
>>>>>>>> Yes I think it would be a simple patch, once you understand
the
>>>>>>>> entrails of the _list system. You should read the query_server_spec.rb
>>>>>>>> to see what gets sent by the query server on first getRow()
call.
>>>>>>>>
>>>>>>>> It may be that this patch can be accomplished just in the
javascript side.
>>>>>>>>
>>>>>>>> Chris
>>>>>>>>
>>>>>>>>> Paul Davis
>>>>>>>>>
>>>>>>>>> On Sat, Sep 26, 2009 at 11:39 PM, Zachary Zolton
>>>>>>>>> <zachary.zolton@gmail.com> wrote:
>>>>>>>>>> Hey guys,
>>>>>>>>>>
>>>>>>>>>> I need to find a way to do a redirect from a _list
function after
>>>>>>>>>> calling the getRow() function. After looking at render.js
for a while
>>>>>>>>>> I can't see how to solve this without at least adding
to the API.
>>>>>>>>>>
>>>>>>>>>> Basically, I think that calling getRow() shouldn't
cause the view
>>>>>>>>>> server to send the headers (or awaiting chunks) unless
we've already
>>>>>>>>>> called send() or something like that. That way, we
can return from the
>>>>>>>>>> _list function after iterating to the first row that
should redirect.
>>>>>>>>>> (I'm not sure if this is a breaking change from the
current semantics,
>>>>>>>>>> however...)
>>>>>>>>>>
>>>>>>>>>> Would greatly appreciate a little guidance on how
to attack this!
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Cheers,
>>>>>>>>>>
>>>>>>>>>> Zach
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> ---------- Forwarded message ----------
>>>>>>>>>> From: Chris Anderson <jchris@apache.org>
>>>>>>>>>> Date: Fri, Sep 25, 2009 at 2:15 PM
>>>>>>>>>> Subject: Re: Redirect from _list function?
>>>>>>>>>> To: Zachary Zolton <zachary.zolton@gmail.com>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Fri, Sep 25, 2009 at 11:01 AM, Zachary Zolton
>>>>>>>>>> <zachary.zolton@gmail.com> wrote:
>>>>>>>>>>> So, now I find that using the send() function
to perform the redirect
>>>>>>>>>>> doesn't work after the first time I call getRow().
Upon checking out
>>>>>>>>>>> render.js, I see that the getRow() function calls
sendStart()—which I
>>>>>>>>>>> haven't quite yet figured out—but I can tell
there's something fishy
>>>>>>>>>>> going on there...
>>>>>>>>>>>
>>>>>>>>>>> Would I be correct to assume that the headers
are already set after
>>>>>>>>>>> calling getRow()?
>>>>>>>>>>
>>>>>>>>>> Yes... The headers are sent when the first getRow
is called. Fixing
>>>>>>>>>> this is definitely something I'd support.
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Fri, Sep 25, 2009 at 12:11 PM, Chris Anderson
<jchris@apache.org> wrote:
>>>>>>>>>>>> On Fri, Sep 25, 2009 at 8:40 AM, Zachary
Zolton
>>>>>>>>>>>> <zachary.zolton@gmail.com> wrote:
>>>>>>>>>>>>> Okay, I've update this section to differentiate
between the 0.9 and
>>>>>>>>>>>>> 0.10 _list API:
>>>>>>>>>>>>>
>>>>>>>>>>>>> http://wiki.apache.org/couchdb/Formatting_with_Show_and_List#Sending_a_Redirect
>>>>>>>>>>>>>
>>>>>>>>>>>>> Now, I'm feeling that the Other Fun Things
section could use a bit of
>>>>>>>>>>>>> love. Hmm...  :^)
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks for keeping the wiki in mind!
>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>> On Fri, Sep 25, 2009 at 10:19 AM, Zachary
Zolton
>>>>>>>>>>>>> <zachary.zolton@gmail.com> wrote:
>>>>>>>>>>>>>> Sweet! I'll try to amend the wiki
page for the _list API...
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On Fri, Sep 25, 2009 at 10:17 AM,
Jason Davies <jason@jasondavies.com> wrote:
>>>>>>>>>>>>>>> On 25 Sep 2009, at 16:16, Zachary
Zolton wrote:
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Thanks for all the help,
guys! Shall I delete that JIRA issue?
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> I already did :-)
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> --
>>>>>>>>>>>>>>> Jason Davies
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> www.jasondavies.com
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> --
>>>>>>>>>>>> Chris Anderson
>>>>>>>>>>>> http://jchrisa.net
>>>>>>>>>>>> http://couch.io
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Chris Anderson
>>>>>>>>>> http://jchrisa.net
>>>>>>>>>> http://couch.io
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> --
>>>>>>>> Chris Anderson
>>>>>>>> http://jchrisa.net
>>>>>>>> http://couch.io
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>>
>>>
>>> --
>>> Chris Anderson
>>> http://jchrisa.net
>>> http://couch.io
>>>
>>
>
>
>
> --
> Chris Anderson
> http://jchrisa.net
> http://couch.io
>

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