Commits on Feb 3, 2024

1. Add Delayed::Plugins::Pidfile …

   The new plugin creates a pidfile at location
   `#{Rails.root}/tmp/delayed_job.pid` when a worker starts and then
   removes it when a worker stops. It uses `lifecycle.around(:execute)` to
   achieve this.
   
   The file is created in "write exclusive" mode. This means if the file
   already exists, `Errno::EEXIST` is raised. This ensures that a worker
   doesn't overwrite a pidfile in use.
   
   This plugin is useful to allow an outside observer (e.g. a healthcheck)
   to check if the worker started successfully.
   
   The plugin is not installed by default for backwards compatibility.
   Users can use it by adding to their initializer:
   
   Delayed::Worker.plugins << Delayed::Plugin::Pidfile
   
   refs collectiveidea#875

   

   jdufresne committed Feb 3, 2024
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