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FEATURE: Allow plugins to register demon processes (#11493)

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This allows plugins to call `register_demon_process` with a Class inheriting from Demon::Base. The unicorn master process will take care of spawning, monitoring and restarting the process. This API should be used with extreme caution, but it is significantly cleaner than spawning processes/threads in an `after_initialize` block.

This commit also cleans up the demon spawning logging so that it uses the same format as unicorn worker logging. It also switches to the block form of `fork` to ensure that Demons exit after running, rather than returning execution to where the fork took place.
This commit is contained in:
David Taylor
2020-12-16 09:43:39 +00:00
committed by GitHub
parent 38b6b098bc
commit 1d024f77a6
4 changed files with 27 additions and 10 deletions
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9
lib/plugin/instance.rb
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@ -861,6 +861,15 @@ class Plugin::Instance
), self)
end
# Register a new demon process to be forked by the Unicorn master.
# The demon_class should inherit from Demon::Base.
# With great power comes great responsibility - this method should
# be used with extreme caution. See `config/unicorn.conf.rb`.
def register_demon_process(demon_class)
raise "Not a demon class" if !demon_class.ancestors.include?(Demon::Base)
DiscoursePluginRegistry.demon_processes << demon_class
end
protected
def self.js_path