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📄 reloader.rb(3.12 KB)
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📄 utils.rb(17.91 KB)
📄 version.rb(785 B)

Editing: reloader.rb

# frozen_string_literal: true

# Copyright (C) 2009-2018 Michael Fellinger <m.fellinger@gmail.com>
# Rack::Reloader is subject to the terms of an MIT-style license.
# See MIT-LICENSE or https://opensource.org/licenses/MIT.

require 'pathname'

module Rack

# High performant source reloader
  #
  # This class acts as Rack middleware.
  #
  # What makes it especially suited for use in a production environment is that
  # any file will only be checked once and there will only be made one system
  # call stat(2).
  #
  # Please note that this will not reload files in the background, it does so
  # only when actively called.
  #
  # It is performing a check/reload cycle at the start of every request, but
  # also respects a cool down time, during which nothing will be done.
  class Reloader
    (require_relative 'core_ext/regexp'; using ::Rack::RegexpExtensions) if RUBY_VERSION < '2.4'

def initialize(app, cooldown = 10, backend = Stat)
      @app = app
      @cooldown = cooldown
      @last = (Time.now - cooldown)
      @cache = {}
      @mtimes = {}
      @reload_mutex = Mutex.new

extend backend
    end

def call(env)
      if @cooldown and Time.now > @last + @cooldown
        if Thread.list.size > 1
          @reload_mutex.synchronize{ reload! }
        else
          reload!
        end

@last = Time.now
      end

@app.call(env)
    end

def reload!(stderr = $stderr)
      rotation do |file, mtime|
        previous_mtime = @mtimes[file] ||= mtime
        safe_load(file, mtime, stderr) if mtime > previous_mtime
      end
    end

# A safe Kernel::load, issuing the hooks depending on the results
    def safe_load(file, mtime, stderr = $stderr)
      load(file)
      stderr.puts "#{self.class}: reloaded `#{file}'"
      file
    rescue LoadError, SyntaxError => ex
      stderr.puts ex
    ensure
      @mtimes[file] = mtime
    end

module Stat
      def rotation
        files = [$0, *$LOADED_FEATURES].uniq
        paths = ['./', *$LOAD_PATH].uniq

files.map{|file|
          next if /\.(so|bundle)$/.match?(file) # cannot reload compiled files

found, stat = figure_path(file, paths)
          next unless found && stat && mtime = stat.mtime

@cache[file] = found

yield(found, mtime)
        }.compact
      end

# Takes a relative or absolute +file+ name, a couple possible +paths+ that
      # the +file+ might reside in. Returns the full path and File::Stat for the
      # path.
      def figure_path(file, paths)
        found = @cache[file]
        found = file if !found and Pathname.new(file).absolute?
        found, stat = safe_stat(found)
        return found, stat if found

paths.find do |possible_path|
          path = ::File.join(possible_path, file)
          found, stat = safe_stat(path)
          return ::File.expand_path(found), stat if found
        end

return false, false
      end

def safe_stat(file)
        return unless file
        stat = ::File.stat(file)
        return file, stat if stat.file?
      rescue Errno::ENOENT, Errno::ENOTDIR, Errno::ESRCH
        @cache.delete(file) and false
      end
    end
  end
end

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