Class: Res::Config

Inherits:
Object
  • Object
show all
Defined in:
lib/res/config.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(items, args = {}) ⇒ Config

Returns a new instance of Config.



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# File 'lib/res/config.rb', line 8

def initialize(items, args = {})
  @required = *items
  @optional = args[:optional] || []
  @prepend = args[:pre_env] || ''
  items = required + optional
  @struct = Struct.new(*items).new
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args, &block) ⇒ Object 



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# File 'lib/res/config.rb', line 54

def method_missing(m, *args, &block)
  struct.send(m,*args, &block)
end

Instance Attribute Details

#optional ⇒ Object

Returns the value of attribute optional.



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# File 'lib/res/config.rb', line 6

def optional
  @optional
end

#prepend ⇒ Object

Returns the value of attribute prepend.



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# File 'lib/res/config.rb', line 6

def prepend
  @prepend
end

#required ⇒ Object

Returns the value of attribute required.



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# File 'lib/res/config.rb', line 6

def required
  @required
end

#struct ⇒ Object

Returns the value of attribute struct.



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# File 'lib/res/config.rb', line 6

def struct
  @struct
end

Class Method Details

.symbolize_keys(hash) ⇒ Object 



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# File 'lib/res/config.rb', line 46

def self.symbolize_keys(hash)
  symbolized_hash = {}
  hash.each do |key, value|
    symbolized_hash[key.to_sym] = value
  end
  symbolized_hash
end

Instance Method Details

#load_from_config(config_file) ⇒ Object 



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# File 'lib/res/config.rb', line 36

def load_from_config(config_file)
  config = {}
  if File.exists?(config_file)
    config = Res::Config.symbolize_keys(YAML::load(File.open(config_file)))
  else
    raise "Couldn't find config file '#{config_file}'"
  end
  config
end

#process(args = {}) ⇒ Object

Load in config – this can come from three places:

  1. Arguments passed to the initializer

  2. From environment variables

  3. From a config file



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# File 'lib/res/config.rb', line 20

def process( args = {} )
  
  config_from_file = {}
  if args[:config_file]
    config_from_file = load_from_config(args[:config_file])
    args.delete(:config_file)
  end
  
  missing = []
  struct.members.each do |item|
    struct[item] = args[item] || ENV[(prepend + item.to_s).upcase] || config_from_file[item] || nil
    missing << item if (struct[item].nil? && required.include?(item))
  end
  raise "Missing configuration: " + missing.join( ", ") if missing.any?
end