#!/usr/bin/env ruby

# Copyright (c) 2007, 2011 Samuel G. D. Williams. <http://www.oriontransfer.co.nz>
# 
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
# 
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

require 'helper'

require 'fileutils'
require 'pathname'
require 'rexec'
require 'timeout'

class TaskTest < Test::Unit::TestCase
	TASK_PATH = Pathname.new(__FILE__).dirname + "./task.rb"
	TEXT = "The quick brown fox jumped over the lazy dog."
	STDOUT_TEXT = "STDOUT: " + TEXT
	STDERR_TEXT = "STDERR: " + TEXT

	def test_script_execution
		RExec::Task.open(TASK_PATH) do |task|
			task.input.puts(TEXT)
			task.input.close

			assert_equal STDOUT_TEXT, task.output.readline.chomp
			assert_equal STDERR_TEXT, task.error.readline.chomp
		end
	end

	def test_ruby_execution
		RExec::Task.open(["ruby", '-']) do |task|
			task.input.puts(TASK_PATH.read)
			task.input.puts("\004")

			task.input.puts(TEXT)
			task.input.close

			assert_equal STDOUT_TEXT, task.output.readline.chomp
			assert_equal STDERR_TEXT, task.error.readline.chomp
		end
	end

	def test_spawn_child
		rd, wr = IO.pipe
		pid = RExec::Task.spawn_child do
			rd.close
			wr.write(TEXT)
			wr.close
			exit(10)
		end

		wr.close

		pid, status = Process.wait2(pid)

		assert_equal rd.read, TEXT
		assert_equal status, status
	end

	def test_spawn_daemon
		rd, wr = IO.pipe

		# We launch one daemon to start another. The first daemon will exit, but the second will keep on running.
		ppid = RExec::Task.spawn_daemon do
			RExec::Task.spawn_daemon do
				rd.close
				sleep 0.5
				wr.puts(TEXT, Process.pid)
				wr.close
				sleep 0.5
			end
		end

		wr.close

		Timeout::timeout(5) do
			until !RExec::Task.running?(ppid) do
				sleep(0.1)
			end

			text = rd.readline.chomp
			pid = rd.readline.chomp.to_i

			assert_raises(EOFError) do
				rd.readline
			end

			assert_equal text, TEXT
			assert RExec::Task.running?(pid)

			until !RExec::Task.running?(pid) do
				sleep(0.1)
			end
		end
	end

	def test_task
		test_results = Proc.new do |input, output, error|
			input.puts TEXT
			input.flush

			assert_equal output.readline.chomp, STDOUT_TEXT
			assert_equal error.readline.chomp, STDERR_TEXT
		end

		RExec::Task.open(TASK_PATH) do |task|
			test_results.call(task.input, task.output, task.error)
		end

		rd, wr = IO.pipe

		RExec::Task.open(TASK_PATH, :in => rd) do |task|
			test_results.call(wr, task.output, task.error)
		end

		assert rd.closed?

		assert_raises(Errno::EPIPE) do
			wr.puts "The pipe is closed on the other side.."
		end

		in_rd, in_wr = IO.pipe
		out_rd, out_wr = IO.pipe
		err_rd, err_wr = IO.pipe

		spawn_child_daemon = Proc.new do
			task = RExec::Task.open(TASK_PATH, :in => in_rd, :out => out_wr, :err => err_wr, :daemonize => true)
		end

		task = RExec::Task.open(spawn_child_daemon, :daemonize => true)

		until !task.running? do
			sleep 0.1
		end

		test_results.call(in_wr, out_rd, err_rd)

		assert !task.running?
	end

	def test_task_passthrough
		script = "echo " + "Hello World!".dump + " | #{TASK_PATH.realpath.to_s.dump}"

		RExec::Task.open(script, :passthrough => :all) do

		end

		[$stdin, $stdout, $stderr].each do |io|
			assert !io.closed?
		end
	end
end