[Sugar-devel] DataStore interface for HTML5 Activity

[lionel at olpc-france.org]

Hmmm.  Finally, I wonder if we need to keep the file handling in the
JavaScript Datastore interface.

I’ve wrote 5 Sugar activities. Each time I’ve only used the Datastore via
read_file/write_file functions and each time it was not to store a file but
to store a "state". And most of the time this state could be translated to a
string (JSON, XML, CSV, 
).

In fact the only case where a file could be interesting is when we handle
binary content (like images). But, at worse it could also be translated to
string and this string could be store in the state.

 

I’m interested by feedbacks from the list about this point: do you think
that file handling is need for the Datastore?

 

                Lionel.

 

 

De : Daniel Narvaez [mailto:dwnarvaez at gmail.com] 
Envoyé : mardi 30 avril 2013 19:06
À : Lionel Laské
Cc : sugar-devel at lists.sugarlabs.org
Objet : Re: [Sugar-devel] DataStore interface for HTML5 Activity

 

Doesn't seem to be implemented in webkigtk yet and the work sort of stalled
apparently

https://bugs.webkit.org/show_bug.cgi?id=58443

 

On 30 April 2013 18:42, Daniel Narvaez <dwnarvaez at gmail.com
<mailto:dwnarvaez at gmail.com> > wrote:

The firefox guys are apparently not very keen about the w3c File stuff

https://hacks.mozilla.org/2012/07/why-no-filesystem-api-in-firefox/

 

On 30 April 2013 18:27, Daniel Narvaez <dwnarvaez at gmail.com
<mailto:dwnarvaez at gmail.com> > wrote:

As you point out, the main problem here is the concept of file.

My understanding is that with the new file APIs you are basically requesting
a sandboxed filesystem, then you can write and read there as you please.
Though I don't know how the shell would then have access to that filesystem,
to be able to move the files into the datastore.

Chromium must be doing something similar to allow writing stuff to google
drive using those interfaces, though they implemented their interfaces
directly into Webkit.

 

On 30 April 2013 17:34, <lionel at olpc-france.org
<mailto:lionel at olpc-france.org> > wrote:

Hi all,

 

As we decided to our IRC meeting last week, I’ve wrote a first draft
proposal for the JavaScript DataStore interface [1].

 

Basically the interface just match the DataStore existing interface. 

The main issue is related to the concept of "file":

-          File is at the heart of the DataStore concept: the DataStore is
nothing else than a place to store files and metadata related to files,

-          But: file handling is not a common practice in JavaScript!

 

The good news is that HTML5 comes with few File system and Files handling
functions [2][3].

I didn’t test it but it should work on WebKit.

 

Do not hesitate to comment/update.

 

                Lionel

 

 

[1] http://wiki.sugarlabs.org/go/HTML5_activities#Datastore 

[2]  <http://dev.w3.org/2009/dap/file-system/pub/FileSystem/>
http://dev.w3.org/2009/dap/file-system/pub/FileSystem/

[3]  <http://dev.w3.org/2009/dap/file-system/file-writer.html>
http://dev.w3.org/2009/dap/file-system/file-writer.html

 

 

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-- 
Daniel Narvaez





-- 
Daniel Narvaez




-- 
Daniel Narvaez

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