Open Stack

Forgot to say that the discussion was started in "[openstack-dev] [Mistral]
Crack at a "Real life" workflow" thread


On Sun, Mar 9, 2014 at 10:39 AM, Stan Lagun <slagun at mirantis.com> wrote:

> First of all MuranoPL is not a host but hosted language. It never intended
> to replace Python and if Python can do the job it is probably better than
> MuranoPL for that job.
> The problem with Python is that you cannot have Python code as a part of
> your DSL if you need to evaluate that DSL on server-side. Using Python's
> eval() is not secure. And you don't have enough control on what evaled code
> is allowed to do. MuranoPL on the contrary are fully sandboxed. You have
> absolute control over what functions/methods/APIs are exposed to DSL and
> DSL code can do nothing except for what it allowed to do. Besides you
> typically do want your DSL to be domain-specific so general-purpose
> language like Python can be suboptimal.
>
> I don't say MuranoPL is good for all projects. It has many Murano-specific
> things after all. In most cases you don't need all those OOP features that
> MuranoPL has. But the code organization, how it uses YAML, block structures
> and especially YAQL expressions can be of a great value to many projects
>
> For examples of MuranoPL classes you can browse
> https://github.com/istalker2/MuranoDsl/tree/master/meta folder. This is
> my private repository that I was using to develop PoC for MuranoPL engine.
> We are on the way to create production-quality implementation with
> unit-tests etc. in regular Murano repositories on stackforge
>
>
> On Sun, Mar 9, 2014 at 7:33 AM, Joshua Harlow <harlowja at yahoo-inc.com>wrote:
>
>> To continue from other thread....
>>
>> """
>> Personally I believe that YAQL-based DSLs similar (but probably simlet
>> than) MuranoPL can be of a great value for many OpenStack projects that
>> have DSLs of different kind. Murano for App Catatalog, Mistral for
>> workflows, Heat for HOT templates, Ceilometer for alarms & counter
>> aggregation rules, Nova for customizable resource scheduling and probably
>> many more.
>> """
>>
>> Isn't python a better host language for said DSLs than muranoPL? I am
>> still pretty weary of a DSL that starts to grow so many features to
>> encompass other DSLs since then it's not really a DSL but a non-DSL, and we
>> already have one that everyone is familiar with (python).
>>
>> Are there any good examples if muranoPL that I can look at that take
>> advantage of muranoPL classes, functions, namespaces which can be compared
>> to there python equivalents. Has such an analysis/evaluation been done?
>>
>> Sent from my really tiny device...
>> _______________________________________________
>> OpenStack-dev mailing list
>> OpenStack-dev at lists.openstack.org
>> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-dev
>>
>
>
>
> --
> Sincerely yours
> Stanislav (Stan) Lagun
> Senior Developer
> Mirantis
> 35b/3, Vorontsovskaya St.
> Moscow, Russia
> Skype: stanlagun
> www.mirantis.com
> slagun at mirantis.com
>



-- 
Sincerely yours
Stanislav (Stan) Lagun
Senior Developer
Mirantis
35b/3, Vorontsovskaya St.
Moscow, Russia
Skype: stanlagun
www.mirantis.com
slagun at mirantis.com
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