Module: ConfigHelper

Included in:
Core::Config
Defined in:
lib/svcbase/config/config_helper.rb

Overview

helpers module to DRY out config fetches with optional default

  • iterates through args looking for first symbol that is present.

  • non-symbols are treated as literals instead of lookups (so only one matters)

  • raises an error if value is present but not valid for type (Integer or Float)

  • raises an error if value is missing and no default specified

  • if supplied, default must either be valid for type or nil

Instance Method Summary collapse

Instance Method Details

#get_b!(*args) ⇒ Object 



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# File 'lib/svcbase/config/config_helper.rb', line 38

def get_b!(*args)
  get_x!(*args) do |v|
    return v if [true, false].include?(v)
    raise ArgumentError, 'not a bool or string' unless v.is_a? String
    case v.downcase
    when 'true'  then true
    when 'false' then false
    else raise ArgumentError, 'not true or false'
    end
  end
end

#get_f!(*args) ⇒ Object 



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# File 'lib/svcbase/config/config_helper.rb', line 30

def get_f!(*args)
  get_x!(*args) { |v| Float(v) }
end

#get_i!(*args) ⇒ Object 



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# File 'lib/svcbase/config/config_helper.rb', line 26

def get_i!(*args)
  get_x!(*args) { |v| Integer(v) }
end

#get_s!(*args) ⇒ Object 



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# File 'lib/svcbase/config/config_helper.rb', line 34

def get_s!(*args)
  get_x!(*args, &:to_s)
end

#get_x!(*args) ⇒ Object 



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# File 'lib/svcbase/config/config_helper.rb', line 11

def get_x!(*args)
  while args.length.positive?
    k = args.shift
    if k.is_a? Symbol
      k = k.to_s
      return yield(self[k]) if key? k
    else
      raise 'default not last argument' unless args.empty?
      return nil if k.nil?
      return yield(k)
    end
  end
  raise 'value not found'
end