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From "Dave Cottlehuber (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1779) Support of HTTP PATCH method to upload/update attachments in chunks
Date Fri, 26 Apr 2013 08:28:16 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1779?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642672#comment-13642672
] 

Dave Cottlehuber commented on COUCHDB-1779:
-------------------------------------------

Hi Sebastian,

It's definitely possible, and a good idea too. You should be able to do almost all of this
already today, using update handlers http://wiki.apache.org/couchdb/Document_Update_Handlers
which you could write in javascript, and possibly a little bit of Erlang to accept PATCH verbs
too. The update handler would accept a doc id, and the PATCH component, and internally it
will be given by couchdb a copy of the original document, the full request object, and obviously
the new document. Your code then needs to merge the PATCH and the old doc, and returns that.
Be aware that update handlers can still get conflicts, the only difference to a client-side
equivalent is that it runs on the server.

If you're interested in adding this feature to couch we'll be happy to assist you along the
way! I'd love to see this in the next feature release of couchdb, whether in JS or Erlang.
                
> Support of HTTP PATCH method to upload/update attachments in chunks
> -------------------------------------------------------------------
>
>                 Key: COUCHDB-1779
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1779
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: Database Core, HTTP Interface
>            Reporter: Sebastian Podjasek
>            Priority: Minor
>
> I'm wondering would it be possible to implement PATCH methods for document attachments.
> I'm currently facing a theoretical problem to upload large files over GSM network, my
storage back-end is CouchDB with our own API served in front-end. I was thinking about few
other solutions, but all of them involves some post processing of document after receiving
last chunk, it would be great to just invoke this:
>    PATCH /database/0519690fc465fc0e9cc0f89fa87973fc/bigfile.dat?_rev=13-c969cb72e5428ca2ccdd191e0cd7bf4b
HTTP/1.1
>    Content-Type: application/octet-string
>    Range: bytes=1200-1300
>    Content-Length: 100
> What do you think about this. Is it theoretically possible.

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