Class: Berater::LuaScript

Inherits:
Object
  • Object
show all
Defined in:
lib/berater/lua_script.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source) ⇒ LuaScript

Returns a new instance of LuaScript.



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# File 'lib/berater/lua_script.rb', line 9

def initialize(source)
  @source = source.dup.freeze
end

Instance Attribute Details

#source ⇒ Object (readonly)

Returns the value of attribute source.



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# File 'lib/berater/lua_script.rb', line 7

def source
  @source
end

Instance Method Details

#eval(redis, *args) ⇒ Object 



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# File 'lib/berater/lua_script.rb', line 17

def eval(redis, *args)
  redis.evalsha(sha, *args)
rescue Redis::CommandError => e
  raise unless e.message.include?('NOSCRIPT')

  # fall back to regular eval, which will trigger
  # script to be cached for next time
  redis.eval(minify, *args)
end

#load(redis) ⇒ Object 



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# File 'lib/berater/lua_script.rb', line 27

def load(redis)
  redis.script(:load, minify).tap do |sha|
    unless sha == self.sha
      raise "unexpected script SHA: expected #{self.sha}, got #{sha}"
    end
  end
end

#loaded?(redis) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/berater/lua_script.rb', line 35

def loaded?(redis)
  redis.script(:exists, sha)
end

#sha ⇒ Object 



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# File 'lib/berater/lua_script.rb', line 13

def sha
  @sha ||= Digest::SHA1.hexdigest(minify).freeze
end

#to_s ⇒ Object 



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# File 'lib/berater/lua_script.rb', line 39

def to_s
  source
end