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Kota,

Thanks for your reply, very helpful!

I know Storlets can provide user-defined computation functionalities,
but I guess some capabilities can only be achieved using middleware.
For example, a user may want such a feature: upon each PUT request, it
creates a compressed copy of the object and stores both the original
copy and compressed copy. It's feasible using middlware but I don't
think Storlets provide such capability.

Another example is that a user may want to install a Swift3-like
middleware to provide APIs to a 3rd party, but she doesn't want other
users to see this middleware.

Regards,
Qiao

On Mon, Sep 17, 2018 at 9:19 PM Kota TSUYUZAKI
<tsuyuzaki.kota at lab.ntt.co.jp> wrote:
>
> With Storlets, users will be able to create their own applications that are able to run like as a Swift middeleware. The application (currently Python and Java are supported as the language but the
> apps can calls any binaries in the workspace) can be uploaded as a Swift object, then, users can invoke them with just an extra header that specifies your apps.
>
> To fit your own use case, we may have to consider to invole or to integrate the system for you but I believe Storlets could be a choice for you.
>
> In detail, Storlets documantation is around there,
>
> Top Level Index: https://docs.openstack.org/storlets/latest/index.html
> System Overview: https://docs.openstack.org/storlets/latest/storlet_engine_overview.html
> APIs: https://docs.openstack.org/storlets/latest/api/overview_api.html
>
> Thanks,
>
> Kota
>
> (2018/09/17 8:59), John Dickinson wrote:
> > You may be interested in Storlets. It's another OpenStack project, maintained by a Swift core reviewer, that provides this sort of user-defined middleware functionality.
> >
> > You can also ask about it in #openstack-swift
> >
> > --John
> >
> >
> >
> > On 16 Sep 2018, at 9:25, Qiao Kang wrote:
> >
> >> Hi,
> >>
> >> I'm wondering whether Swift allows any user (not the administrator) to
> >> specify which middleware that she/he wants his data object to go throught.
> >> For instance, Alice wants to install a middleware but doesn't want Bob to
> >> use it, where Alice and Bob are two accounts in a single Swift cluster.
> >>
> >> Or maybe all middlewares are pre-installed globally and cannot be
> >> customized on a per-account basis?
> >>
> >> Thanks,
> >> Qiao
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>
> --
> ----------------------------------------------------------
> Kota Tsuyuzaki(露﨑　浩太)  <tsuyuzaki.kota at lab.ntt.co.jp>
> NTT Software Innovation Center
> Distributed Computing Technology Project
> Phone  0422-59-2837
> Fax    0422-59-2965
> -----------------------------------------------------------
>
>
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