121 lines
		
	
	
		
			3.2 KiB
		
	
	
	
		
			Ruby
		
	
	
	
	
	
			
		
		
	
	
			121 lines
		
	
	
		
			3.2 KiB
		
	
	
	
		
			Ruby
		
	
	
	
	
	
# frozen_string_literal: true
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class Mastodon::RedisConfiguration
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  DEFAULTS = {
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    host: 'localhost',
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    port: 6379,
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    db: 0,
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  }.freeze
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  def base
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    @base ||= setup_config(prefix: nil, defaults: DEFAULTS)
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              .merge(namespace: base_namespace)
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  end
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  def sidekiq
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    @sidekiq ||= setup_config(prefix: 'SIDEKIQ_')
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                 .merge(namespace: sidekiq_namespace)
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  end
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  def cache
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    @cache ||= setup_config(prefix: 'CACHE_')
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               .merge({
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                 namespace: cache_namespace,
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                 expires_in: 10.minutes,
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                 connect_timeout: 5,
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                 pool: {
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                   size: Sidekiq.server? ? Sidekiq[:concurrency] : Integer(ENV['MAX_THREADS'] || 5),
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                   timeout: 5,
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                 },
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               })
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  end
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  private
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  def driver
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    ENV['REDIS_DRIVER'] == 'ruby' ? :ruby : :hiredis
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  end
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  def namespace
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    @namespace ||= ENV.fetch('REDIS_NAMESPACE', nil)
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  end
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  def base_namespace
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    return "mastodon_test#{ENV.fetch('TEST_ENV_NUMBER', nil)}" if Rails.env.test?
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    namespace
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  end
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  def sidekiq_namespace
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    namespace
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  end
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  def cache_namespace
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    namespace ? "#{namespace}_cache" : 'cache'
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  end
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  def setup_config(prefix: nil, defaults: {})
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    prefix = "#{prefix}REDIS_"
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    url      = ENV.fetch("#{prefix}URL", nil)
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    user     = ENV.fetch("#{prefix}USER", nil)
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    password = ENV.fetch("#{prefix}PASSWORD", nil)
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    host     = ENV.fetch("#{prefix}HOST", defaults[:host])
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    port     = ENV.fetch("#{prefix}PORT", defaults[:port])
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    db       = ENV.fetch("#{prefix}DB", defaults[:db])
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    return { url:, driver: } if url
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    sentinel_options = setup_sentinels(prefix, default_user: user, default_password: password)
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    if sentinel_options.present?
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      host = sentinel_options[:name]
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      port = nil
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      db ||= 0
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    end
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    url = construct_uri(host, port, db, user, password)
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    if url.present?
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      { url:, driver: }.merge(sentinel_options)
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    else
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      # Fall back to base config, which has defaults for the URL
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      # so this cannot lead to endless recursion.
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      base
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    end
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  end
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  def setup_sentinels(prefix, default_user: nil, default_password: nil)
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    name              = ENV.fetch("#{prefix}SENTINEL_MASTER", nil)
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    sentinel_port     = ENV.fetch("#{prefix}SENTINEL_PORT", 26_379)
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    sentinel_list     = ENV.fetch("#{prefix}SENTINELS", nil)
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    sentinel_username = ENV.fetch("#{prefix}SENTINEL_USERNAME", default_user)
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    sentinel_password = ENV.fetch("#{prefix}SENTINEL_PASSWORD", default_password)
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    sentinels = parse_sentinels(sentinel_list, default_port: sentinel_port)
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    if name.present? && sentinels.present?
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      { name:, sentinels:, sentinel_username:, sentinel_password: }
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    else
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      {}
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    end
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  end
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  def construct_uri(host, port, db, user, password)
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    return nil if host.blank?
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    Addressable::URI.parse("redis://#{host}:#{port}/#{db}").tap do |uri|
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      uri.user = user if user.present?
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      uri.password = password if password.present?
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    end.normalize.to_str
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  end
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  def parse_sentinels(sentinels_string, default_port: 26_379)
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    (sentinels_string || '').split(',').map do |sentinel|
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      host, port = sentinel.split(':')
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      port = (port || default_port).to_i
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      { host: host, port: port }
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    end.presence
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  end
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end
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