[opensource-dev] Client-side scripting in Snowglobe

Morgaine morgaine.dinova at googlemail.com
Thu Feb 18 04:57:48 PST 2010

A line got lost from my post owing to finger trouble.  Item 6 about Mono
should have read:

6. Some parties identify other reasons for avoiding Mono in general.
 Without getting into that subject at all, requiring Mono for client-side
scripting would make scripting unavailable to that portion of the user
base.  Since client-side scripting without Mono is perfectly feasible, Mono
should not be made mandatory for scripting, so that the widest user base can
be supported.



On Thu, Feb 18, 2010 at 12:42 PM, Morgaine
<morgaine.dinova at googlemail.com>wrote:

> I referred recently to Linden's internal project "Firefly" to add
> client-side scripting to SL viewers.  This has been the topic of open
> discussion at several Office Hours with Lindens in SL, but that openness has
> not extended to many design details --- the Firefly design process is not
> open to the community.  The only technical details that are being disclosed
> about Firefly appear to be:
>    - "Scripts" are actually *Mono assemblies*, so that only languages that
>    compile to Mono will be allowed.
>    - The programs run in a *sandbox*, which means that most platform
>    resources are not accessible to them.
> Please note that I quite like C# as a language, but the following remarks
> are about Mono use *in the SL viewer*, only, where its tradeoffs are poor.
> The first known detail about Firefly (mandatory Mono) is problematic on
> several fronts:
>    1. Only a tiny fraction of the world's applications, libraries and
>    languages work on Mono, so client-side scripting will be unable to benefit
>    from the huge mountain of resources available on the Internet.  This is an
>    extremely severe limitation, and an unnecessary restriction in the context
>    of client-side viewer scripting.  If I want to use a locally-installed
>    package X from within my client-side script, I should be able to.  What runs
>    client-side should always be our individual choice, not someone else's.
>    2. Programmers want to write client-side scripts in the language that
>    they know best, because that always yields the fastest progress and highest
>    quality results.  There was a good technical reason for forcing everyone to
>    use LSL server-side, but there is no technical reason to impose this
>    requirement on all client-side scripting.  It is counter-productive to force
>    CLR compatibility on client-side script developers when there is a simple
>    alternative:  define a *socket-based viewer API* for client-side
>    scripts instead, hence usable from any language.
>    3. Mono runs poorly on Linux, so from being rock-solid on Linux now,
>    the LL-derived viewers will become second-rate on this platform.
>    4. The viewer is already extremely bloated and a memory hog.  Adding a
>    Mono dependency will compound that horribly.
>    5. There is only one effective supplier of Mono:  Novell.  That is a
>    very bad situation to encourage and to support in the viewer.
>    6. Some parties identify other reasons for avoiding Mono in general.
>     Without getting into that subject at all,
> The second known detail about Firefly (mandatory sandbox) is problematic on
> two related fronts:
>    1. Sandboxes by design do not allow most platform resources to be
>    accessed, as a security measure.  This is fine and important when scripts
>    are being downloaded from unknown places (like Javascript in web pages), but
>    that same protection also means that client-side scripts would be powerless
>    to do useful things for us in concert with local applications, files,
>    devices, etc.  Sandboxing client-side scripts effectively hardwires in
>    script weakness for no reason discussed as a requirement.
>    2. Sandboxed applications cannot be linked with user-chosen native
>    libraries since allowing native code breaks sandbox protection.  This means
>    no accelerators, no extensions, and no interop with other systems since
>    sockets are inaccessible from any strong sandbox.  This also means no
>    evolution or progress outside of what the sandbox designers permit.
> This mailing list is concerned with development of open source viewers, in
> particular Snowglobe.  This is heralded as a *community* viewer, embodying
> *community* requirements much more directly than the LL mainstream viewer.
>  Client-side scripting will impact on every single aspect of Snowglobe bar
> none, yet the community is being excluded from the design of its most
> powerful infrastructure element.  This is entirely wrong, far beyond the
> normal observation that secrecy in design has no place in open source.
> It is hard to assess things technically when the design requirements are
> formulated in secret.  The Snowglobe community has design requirements too.
>  Those deserve to be examined here openly, not limiting Snowglobe to a
> design that stems from Linden requirements alone.
> Morgaine.
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