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# encoding: utf-8
#
# Author:: Dominik Richter (<dominik.richter@gmail.com>)
# Author:: Christoph Hartmann (<chris@lollyrock.com>)
module Train
module Options
def self.attach(target)
target.class.method(:include).call(ClassOptions)
target.method(:include).call(InstanceOptions)
end
module ClassOptions
def option(name, conf = nil, &block)
d = conf || {}
unless d.is_a? Hash
raise Train::ClientError,
"The transport plugin #{self} declared an option #{name} "\
"and didn't provide a valid configuration hash."
end
if !conf.nil? && !conf[:default].nil? && block_given?
raise Train::ClientError,
"The transport plugin #{self} declared an option #{name} "\
"with both a default value and block. Only use one of these."
end
d[:default] = block if block_given?
default_options[name] = d
end
def default_options
@default_options = {} unless defined? @default_options
@default_options
end
def include_options(other)
unless other.respond_to?(:default_options)
raise "Trying to include options from module #{other.inspect}, "\
"which doesn't seem to support options."
end
default_options.merge!(other.default_options)
end
end
module InstanceOptions
# @return [Hash] options, which created this Transport
attr_reader :options
def default_options
self.class.default_options
end
def merge_options(base, opts)
res = base.merge(opts || {})
default_options.each do |field, hm|
next unless res[field].nil? && hm.key?(:default)
default = hm[:default]
if default.is_a? Proc
res[field] = default.call(res)
else
res[field] = default
end
end
res
end
def validate_options(opts)
default_options.each do |field, hm|
if opts[field].nil? && hm[:required]
raise Train::ClientError,
"You must provide a value for #{field.to_s.inspect}."
end
end
opts
end
end
end
end
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