[Satosa-dev] sharing state between satosa microservices

Am 2019-07-11 um 23:19 schrieb Giuseppe De Marco <giuseppe.demarco at unical.it>: Hi Rainer, very interesting to me. The last time I heard Borg pattern was 2010, I'm touched. It's simply a singleton pattern variation based on an attributes stored in the class scope. With your example I understand your proposal and yes, I think that's a good solution to handle this kind of shared state. In the past I used a modified singleton to share objects built with the same arguments: https://github.com/faif/python-patterns/blob/master/patterns/creational/bor… <https://github.com/faif/python-patterns/blob/master/patterns/creational/borg.py> this is also a simpler pure-borg example that I found very fun in its simplicity https://github.com/faif/python-patterns/blob/master/patterns/creational/bor… <https://github.com/faif/python-patterns/blob/master/patterns/creational/borg.py> Il giorno gio 11 lug 2019 alle ore 22:10 Rainer Hoerbe <rainer at hoerbe.at <mailto:rainer at hoerbe.at>> ha scritto: We did not have time in the last call to discuss this: There are use cases where we need to share state between a request and a response microservice. Now we have already 2 cases, so I suggest to define a common method to achieve this. The same approach could also be used to access the common config, e.g. if you need to know the proxy configuration (such as a backend entityid) in a microservice. A simple mechanism would be to use a module-level variable as singleton: ===================== shared_state.py state = {} ——— plugins/microservices/a.py from shared_state import state # import executes only once … state[’a’] = 'foo' ——— plugins/microservices/b.py from shared_state import state whatever(state['a‘]) ===================== I thing that for just passing request status to response microservices and passing config data around this should be good enough. There are several alternatives, like the Borg pattern, which I find harder to read. - Rainer _______________________________________________ Satosa-dev mailing list Satosa-dev at lists.sunet.se <mailto:Satosa-dev at lists.sunet.se> https://lists.sunet.se/listinfo/satosa-dev <https://lists.sunet.se/listinfo/satosa-dev> -- ____________________ Dott. Giuseppe De Marco CENTRO ICT DI ATENEO University of Calabria 87036 Rende (CS) - Italy Phone: +39 0984 496961 e-mail: giuseppe.demarco at unical.it <mailto:giuseppe.demarco at unical.it> ------------------------------------------------------------------------------------------------------------------ Il banner è generato automaticamente dal servizio di posta elettronica dell'Università della Calabria <http://www.unical.it/5x1000>