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7c3a29c9d6
* Updates GitHub Actions * Switches from `bundler/inline` to an optional group in the `Gemfile` because the previous solution didn't work well with rspec * Adds the converter framework and tests * Allows loading private converters (see README) * Switches from multiple CLI tools to a single CLI * Makes DB connections reusable and adds a new abstraction for the `IntermediateDB` * `IntermediateDB` acts as an interface for IPC calls when a converter steps runs in parallel (forks). Only the main process writes to the DB. * Includes a simple example implementation of a converter for now.
106 lines
2.4 KiB
Ruby
106 lines
2.4 KiB
Ruby
# frozen_string_literal: true
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module Migrations
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module ForkManager
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@before_fork_hooks = []
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@after_fork_parent_hooks = []
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@after_fork_child_hooks = []
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@execute_parent_forks = true
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class << self
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def batch_forks
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@execute_parent_forks = false
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run_before_fork_hooks
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yield
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run_after_fork_parent_hooks
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@execute_parent_forks = true
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end
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def before_fork(run_once: false, &block)
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if block
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@before_fork_hooks << { run_once:, block: }
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block
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end
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end
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def remove_before_fork_hook(block)
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@before_fork_hooks.delete_if { |hook| hook[:block] == block }
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end
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def after_fork_parent(run_once: false, &block)
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if block
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@after_fork_parent_hooks << { run_once:, block: }
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block
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end
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end
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def remove_after_fork_parent_hook(block)
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@after_fork_parent_hooks.delete_if { |hook| hook[:block] == block }
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end
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def after_fork_child(&block)
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if block
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@after_fork_child_hooks << { run_once: true, block: }
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block
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end
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end
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def remove_after_fork_child_hook(block)
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@after_fork_child_hooks.delete_if { |hook| hook[:block] == block }
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end
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def fork
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run_before_fork_hooks if @execute_parent_forks
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pid =
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Process.fork do
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run_after_fork_child_hooks
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yield
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end
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@after_fork_child_hooks.clear
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run_after_fork_parent_hooks if @execute_parent_forks
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pid
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end
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def size
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@before_fork_hooks.size + @after_fork_parent_hooks.size + @after_fork_child_hooks.size
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end
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def clear!
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@before_fork_hooks.clear
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@after_fork_parent_hooks.clear
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@after_fork_child_hooks.clear
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end
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private
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def run_before_fork_hooks
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run_hooks(@before_fork_hooks)
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end
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def run_after_fork_parent_hooks
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run_hooks(@after_fork_parent_hooks)
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cleanup_run_once_hooks(@after_fork_child_hooks)
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end
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def run_after_fork_child_hooks
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run_hooks(@after_fork_child_hooks)
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end
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def run_hooks(hooks)
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hooks.each { |hook| hook[:block].call }
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cleanup_run_once_hooks(hooks)
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end
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def cleanup_run_once_hooks(hooks)
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hooks.delete_if { |hook| hook[:run_once] }
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end
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end
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end
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end
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