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#
# Author:: Daniel DeLeo (<dan@chef.io>)
#
# Copyright:: Copyright (c) Chef Software Inc.
# 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 "spec_helper"
require "chef/event_dispatch/dispatcher"
describe Chef::EventDispatch::Dispatcher do
subject(:dispatcher) { Chef::EventDispatch::Dispatcher.new }
let(:event_sink) { instance_double("Chef::EventDispatch::Base") }
it "has no subscribers by default" do
expect(dispatcher.subscribers).to be_empty
end
context "when an event sink is registered" do
before do
dispatcher.register(event_sink)
end
it "it has the event sink as a subscriber" do
expect(dispatcher.subscribers.size).to eq(1)
expect(dispatcher.subscribers.first).to eq(event_sink)
end
it "forwards events to the subscribed event sink" do
# the events all have different arity and such so we just hit a few different events:
run_status = Chef::RunStatus.new({}, {})
expect(event_sink).to receive(:run_start).with("12.4.0", run_status)
dispatcher.run_start("12.4.0", run_status)
cookbook_version = double("cookbook_version")
expect(event_sink).to receive(:synchronized_cookbook).with("apache2", cookbook_version)
dispatcher.synchronized_cookbook("apache2", cookbook_version)
exception = StandardError.new("foo")
expect(event_sink).to receive(:recipe_file_load_failed).with("/path/to/file.rb", exception, "myrecipe")
dispatcher.recipe_file_load_failed("/path/to/file.rb", exception, "myrecipe")
end
context "when an event sink has fewer arguments for an event" do
# Can't use a double because they don't report arity correctly.
let(:event_sink) do
Class.new(Chef::EventDispatch::Base) do
attr_reader :synchronized_cookbook_args
def synchronized_cookbook(cookbook_name)
@synchronized_cookbook_args = [cookbook_name]
end
end.new
end
it "trims the arugment list" do
cookbook_version = double("cookbook_version")
dispatcher.synchronized_cookbook("apache2", cookbook_version)
expect(event_sink.synchronized_cookbook_args).to eq ["apache2"]
end
end
end
context "when two event sinks have different arguments for an event" do
let(:event_sink_1) do
Class.new(Chef::EventDispatch::Base) do
attr_reader :synchronized_cookbook_args
def synchronized_cookbook(cookbook_name)
@synchronized_cookbook_args = [cookbook_name]
end
end.new
end
let(:event_sink_2) do
Class.new(Chef::EventDispatch::Base) do
attr_reader :synchronized_cookbook_args
def synchronized_cookbook(cookbook_name, cookbook)
@synchronized_cookbook_args = [cookbook_name, cookbook]
end
end.new
end
context "and the one with fewer arguments comes first" do
before do
dispatcher.register(event_sink_1)
dispatcher.register(event_sink_2)
end
it "trims the arugment list" do
cookbook_version = double("cookbook_version")
dispatcher.synchronized_cookbook("apache2", cookbook_version)
expect(event_sink_1.synchronized_cookbook_args).to eq ["apache2"]
expect(event_sink_2.synchronized_cookbook_args).to eq ["apache2", cookbook_version]
end
end
context "and the one with fewer arguments comes last" do
before do
dispatcher.register(event_sink_2)
dispatcher.register(event_sink_1)
end
it "trims the arugment list" do
cookbook_version = double("cookbook_version")
dispatcher.synchronized_cookbook("apache2", cookbook_version)
expect(event_sink_1.synchronized_cookbook_args).to eq ["apache2"]
expect(event_sink_2.synchronized_cookbook_args).to eq ["apache2", cookbook_version]
end
end
end
context "events that queue events" do
class Accumulator
def self.sequence
@sequence ||= []
end
end
let(:event_sink_1) do
Class.new(Chef::EventDispatch::Base) do
def synchronized_cookbook(dispatcher, arg)
dispatcher.enqueue(:event_two, arg)
Accumulator.sequence << [ :sink_1_event_1, arg ]
end
def event_two(arg)
Accumulator.sequence << [ :sink_1_event_2, arg ]
end
end.new
end
let(:event_sink_2) do
Class.new(Chef::EventDispatch::Base) do
def synchronized_cookbook(dispatcher, arg)
Accumulator.sequence << [ :sink_2_event_1, arg ]
end
def event_two(arg)
Accumulator.sequence << [ :sink_2_event_2, arg ]
end
end.new
end
before do
dispatcher.register(event_sink_1)
dispatcher.register(event_sink_2)
end
it "runs the events in the correct order without interleaving the enqueued event" do
dispatcher.synchronized_cookbook(dispatcher, "two")
expect(Accumulator.sequence).to eql([
[:sink_1_event_1, "two"], # the call to enqueue the event happens here
[:sink_2_event_1, "two"], # event 1 fully finishes
[:sink_1_event_2, "two"],
[:sink_2_event_2, "two"], # then event 2 runs and finishes
])
end
end
end
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