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#
# Author:: Ranjib Dey (<ranjib@linux.com>)
# Copyright:: Copyright 2015-2016, Ranjib Dey
# License:: Apache License, Version 2.0
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require "chef/event_dispatch/base"
require "chef/exceptions"
require "chef/config"
class Chef
module EventDispatch
class DSL
attr_reader :handler
def initialize(name)
klass = Class.new(Chef::EventDispatch::Base) do
attr_reader :name
end
@handler = klass.new
@handler.instance_variable_set(:@name, name)
# Use event.register API to add anonymous handler if Chef.run_context
# and associated event dispatcher is set, else fallback to
# Chef::Config[:event_handlers]
if Chef.run_context && Chef.run_context.events
Chef::Log.debug("Registering handler '#{name}' using events api")
Chef.run_context.events.register(handler)
else
Chef::Log.debug("Registering handler '#{name}' using global config")
Chef::Config[:event_handlers] << handler
end
end
# Adds a new event handler derived from base handler
# with user defined block against a chef event
#
# @return [Chef::EventDispatch::Base] a base handler object
def on(event_type, &block)
validate!(event_type)
handler.define_singleton_method(event_type) do |*args|
instance_exec(*args, &block)
end
end
private
def validate!(event_type)
all_event_types = (Chef::EventDispatch::Base.instance_methods - Object.instance_methods)
raise Chef::Exceptions::InvalidEventType, "Invalid event type: #{event_type}" unless all_event_types.include?(event_type)
end
end
end
end
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