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 <[email protected]> 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 <[email protected]>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 >> [email protected] >> 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 > [email protected] > -- Sincerely yours Stanislav (Stan) Lagun Senior Developer Mirantis 35b/3, Vorontsovskaya St. Moscow, Russia Skype: stanlagun www.mirantis.com [email protected]
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