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require 'dotenv'
# Hot Live Constants
module HotConstants
HOTENV = {} # rubocop:disable Style/MutableConstant
LOGGER = SemanticLogger[to_s]
class << self
def initialize
@on_change_listeners = {}
env_sample = Dotenv.parse('.env.sample') # TODO: able to detect add/remove, then either call define_method or undef_method!
env_sample.each do |key, value|
dkey = key.downcase
method = method_from_value(value)
singleton_class.define_method(dkey) { method.call(key, value) }
LOGGER.info("create method <#{dkey}> performing <#{method.name}> with default value <#{value}> ")
end
reload!
end
def reload!
HOTENV.replace Dotenv.parse # TODO: detect true changes before processing block below (or yield)
@on_change_listeners.each_pair do |key, block|
old_value = nil # TODO: remember last previous value
new_value = method(key).call
block.call(new_value)
end
end
def on_change(key, &block)
@on_change_listeners[key.downcase.to_sym] = block
end
private
def load_boolean(key, default) = HOTENV.fetch(key, default).to_s.downcase == 'true'
def load_integer(key, default) = HOTENV.fetch(key, default).to_i
def load_string(key, default) = HOTENV.fetch(key, default)
def method_from_value(value)
case value.downcase
when /^(true|false)$/ then method(:load_boolean)
when /^\d+$/ then method(:load_integer)
else method(:load_string)
end
end
end
end