[Twisted-Python] How to restart Twisted service in-process

[Glyph Lefkowitz]

> On Feb 2, 2017, at 1:17 AM, Роман Мещеряков <romanmescheryakov at yandex.ru> wrote:
> 
> Hello everyone! I wrote Twisted-based TCP server which is capable of running in several relatively different modes. When mode switch is needed, I would like the server to restart itself by some means, for it to read new mode from configuration file and create corresponding implementation. Also I wanted the restart to occur without re-running twistd process, because it seems to me more appropriate for Linux daemon.

Hi Roman,

Sorry it took a while to get to this one :).

If your solution is working for you, then it's fine.  You've correctly understood the API associated with IServiceCollection and your implementation (at least at first glance, I don't have time to test it exhaustively :)) is correct.

However, there's a more philosophical question as well: if you really want to re-start from scratch, what exactly are you shutting down and starting up again?  Wouldn't you want to be able to load new code?  Simply stopping and starting objects won't re-initialize the process from the beginning, only from some indeterminate middle state where parts of the program are already set up; this doesn't have the usual desired effect of a "restart" where potentially unknown or buggy state is cleared away.

You may want to consider simply calling execv https://docs.python.org/2.7/library/os.html#os.execv <https://docs.python.org/2.7/library/os.html#os.execv> with [sys.executable] + sys.argv rather than trying to do this in terms of Twisted's APIs.

-glyph

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