# @author Donovan Preston, Aaron Brashears
#
# Copyright (c) 2006-2007, Linden Research, Inc.
# 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.

import sys
from unittest import TestCase, main

from eventlib import processes

class TestEchoPool(TestCase):
    def setUp(self):
        self.pool = processes.ProcessPool('echo', ["hello"])

    def test_echo(self):
        result = None

        proc = self.pool.get()
        try:
            result = proc.read()
        finally:
            self.pool.put(proc)
        self.assertEquals(result, 'hello\n')

    def test_read_eof(self):
        proc = self.pool.get()
        try:
            proc.read()
            self.assertRaises(processes.DeadProcess, proc.read)
        finally:
            self.pool.put(proc)


class TestCatPool(TestCase):
    def setUp(self):
        self.pool = processes.ProcessPool('cat')

    def test_cat(self):
        result = None

        proc = self.pool.get()
        try:
            proc.write('goodbye')
            proc.close_stdin()
            result = proc.read()
        finally:
            self.pool.put(proc)

        self.assertEquals(result, 'goodbye')

    def test_write_to_dead(self):
        result = None

        proc = self.pool.get()
        try:
            proc.write('goodbye')
            proc.close_stdin()
            result = proc.read()
            self.assertRaises(processes.DeadProcess, proc.write, 'foo')
        finally:
            self.pool.put(proc)

    def test_close(self):
        result = None

        proc = self.pool.get()
        try:
            proc.write('hello')
            proc.close()
            self.assertRaises(processes.DeadProcess, proc.write, 'goodbye')
        finally:
            self.pool.put(proc)


class TestDyingProcessesLeavePool(TestCase):
    def setUp(self):
        self.pool = processes.ProcessPool('echo', ['hello'], max_size=1)

    def test_dead_process_not_inserted_into_pool(self):
        proc = self.pool.get()
        try:
            try:
                result = proc.read()
                self.assertEquals(result, 'hello\n')
                result = proc.read()
            except processes.DeadProcess:
                pass
        finally:
            self.pool.put(proc)
        proc2 = self.pool.get()
        self.assert_(proc is not proc2)


class TestProcessLivesForever(TestCase):
    def setUp(self):
        self.pool = processes.ProcessPool(sys.executable, ['-c', 'print "y"; import time; time.sleep(0.4); print "y"'], max_size=1)

    def test_reading_twice_from_same_process(self):
        # this test is a little timing-sensitive in that if the sub-process
        # completes its sleep before we do a full put/get then it will fail
        proc = self.pool.get()
        try:
            result = proc.read(2)
            self.assertEquals(result, 'y\n')
        finally:
            self.pool.put(proc)

        proc2 = self.pool.get()
        self.assert_(proc is proc2, "This will fail if there is a timing issue")
        try:
            result = proc2.read(2)
            self.assertEquals(result, 'y\n')
        finally:
            self.pool.put(proc2)


if __name__ == '__main__':
    main()