Class: Config::Sources::EnvSource

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

Overview

Allows settings to be loaded from a “flat” hash with string keys, like ENV.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(env, prefix: Config.env_prefix || Config.const_name, separator: Config.env_separator, converter: Config.env_converter, parse_values: Config.env_parse_values) ⇒ EnvSource

Returns a new instance of EnvSource.



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# File 'lib/config/sources/env_source.rb', line 10

def initialize(env,
               prefix: Config.env_prefix || Config.const_name,
               separator: Config.env_separator,
               converter: Config.env_converter,
               parse_values: Config.env_parse_values)
  @env = env
  @prefix = prefix.to_s.split(separator)
  @separator = separator
  @converter = converter
  @parse_values = parse_values
end

Instance Attribute Details

#converter ⇒ Object (readonly)

Returns the value of attribute converter.



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# File 'lib/config/sources/env_source.rb', line 7

def converter
  @converter
end

#parse_values ⇒ Object (readonly)

Returns the value of attribute parse_values.



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# File 'lib/config/sources/env_source.rb', line 8

def parse_values
  @parse_values
end

#prefix ⇒ Object (readonly)

Returns the value of attribute prefix.



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# File 'lib/config/sources/env_source.rb', line 5

def prefix
  @prefix
end

#separator ⇒ Object (readonly)

Returns the value of attribute separator.



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# File 'lib/config/sources/env_source.rb', line 6

def separator
  @separator
end

Instance Method Details

#load ⇒ Object 



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# File 'lib/config/sources/env_source.rb', line 22

def load
  return {} if @env.nil? || @env.empty?

  hash = Hash.new

  @env.each do |variable, value|
    keys = variable.to_s.split(separator)

    next if keys.shift(prefix.size) != prefix

    keys.map! { |key|
      case converter
        when :downcase then
          key.downcase
        when nil then
          key
        else
          raise "Invalid ENV variables name converter: #{converter}"
      end
    }

    leaf = keys[0...-1].inject(hash) { |h, key|
      h[key] ||= {}
    }

    unless leaf.is_a?(Hash)
      conflicting_key = (prefix + keys[0...-1]).join(separator)
      raise "Environment variable #{variable} conflicts with variable #{conflicting_key}"
    end

    leaf[keys.last] = parse_values ? __value(value) : value
  end

  hash
end