#!/usr/bin/python

# Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Regression tests for devserver."""

import os
import signal
import shutil
import subprocess
import sys
import time
import unittest
import urllib2
from xml.dom import minidom

# Paths are relative to this script's base directory.
STATIC_DIR = 'static'
TEST_IMAGE_PATH = 'testdata/devserver'
TEST_IMAGE_NAME = 'developer-test.gz'
TEST_IMAGE = TEST_IMAGE_PATH + '/' + TEST_IMAGE_NAME
TEST_FACTORY_CONFIG = 'testdata/devserver/miniomaha-test.conf'
TEST_DATA_PATH = '/tmp/devserver-test'
TEST_CLIENT_PREFIX = 'ChromeOSUpdateEngine'

UPDATE_REQUEST = """<?xml version="1.0" encoding="UTF-8"?>
<o:gupdate xmlns:o="http://www.google.com/update2/request" version="ChromeOSUpdateEngine-0.1.0.0" updaterversion="ChromeOSUpdateEngine-0.1.0.0" protocol="2.0" ismachine="1">
    <o:os version="Indy" platform="Chrome OS" sp="0.11.254.2011_03_09_1814_i686"></o:os>
    <o:app appid="{DEV-BUILD}" version="0.11.254.2011_03_09_1814" lang="en-US" track="developer-build" board="x86-generic" hardware_class="BETA DVT" delta_okay="true">
        <o:updatecheck></o:updatecheck>
        <o:event eventtype="3" eventresult="2" previousversion="0.11.216.2011_03_02_1358"></o:event>
    </o:app>
</o:gupdate>
"""
# TODO(girts): use a random available port.
UPDATE_URL = 'http://127.0.0.1:8080/update'

# Run all tests while being in /
base_dir = os.path.dirname(os.path.abspath(sys.argv[0]))
os.chdir("/")

class DevserverTest(unittest.TestCase):
  """Regressions tests for devserver."""

  def setUp(self):
    """Copies in testing files."""

    # Copy in developer-test.gz, as "static/" directory is hardcoded, and it
    # would be very hard to change it (static file serving is handled deep
    # inside webpy).
    self.image_src = os.path.join(base_dir, TEST_IMAGE)
    self.image = os.path.join(base_dir, STATIC_DIR, TEST_IMAGE_NAME)
    if os.path.exists(self.image):
      os.unlink(self.image)
    shutil.copy(self.image_src, self.image)

    self.factory_config = os.path.join(base_dir, TEST_FACTORY_CONFIG)

  def tearDown(self):
    """Removes testing files."""
    if os.path.exists(self.image):
      os.unlink(self.image)

  def testValidateFactoryConfig(self):
    """Tests --validate_factory_config."""
    cmd = [
        'python',
        os.path.join(base_dir, 'devserver.py'),
        '--validate_factory_config',
        '--client_prefix', TEST_CLIENT_PREFIX,
        '--factory_config', self.factory_config,
    ]
    process = subprocess.Popen(cmd, stdout=subprocess.PIPE)
    stdout, _ = process.communicate()
    self.assertEqual(0, process.returncode)
    self.assertTrue('Config file looks good.' in stdout)

  def _StartServer(self, data_dir=''):
    """Starts devserver, returns process."""
    cmd = [
        'python',
        os.path.join(base_dir, 'devserver.py'),
        'devserver.py',
        '--client_prefix', TEST_CLIENT_PREFIX,
        '--factory_config', self.factory_config,
    ]
    if data_dir:
      cmd.append('--data_dir')
      cmd.append(data_dir)
    process = subprocess.Popen(cmd)
    return process.pid

  def testHandleUpdate(self):
    """Tests running the server and getting an update."""
    pid = self._StartServer()
    try:
      # Wait for the server to start up.
      time.sleep(1)
      request = urllib2.Request(UPDATE_URL, UPDATE_REQUEST)
      connection = urllib2.urlopen(request)
      response = connection.read()
      connection.close()
      self.assertNotEqual('', response)

      # Parse the response and check if it contains the right result.
      dom = minidom.parseString(response)
      update = dom.getElementsByTagName('updatecheck')[0]

      codebase = update.getAttribute('codebase')
      self.assertEqual('http://127.0.0.1:8080/static/' + TEST_IMAGE_NAME,
                       codebase)

      hash_value = update.getAttribute('hash')
      self.assertEqual('kGcOinJ0vA8vdYX53FN0F5BdwfY=', hash_value)

      # Try to fetch the image.
      connection = urllib2.urlopen(codebase)
      contents = connection.read()
      connection.close()
      self.assertEqual('Developers, developers, developers!\n', contents)
    finally:
      os.kill(pid, signal.SIGKILL)

  def testHandleDatadirUpdate(self):
    """Tests getting an update from a specified datadir"""
    # Push the image to the expected path where devserver picks it up.
    image_path = os.path.join(TEST_DATA_PATH, STATIC_DIR)
    if not os.path.exists(image_path):
      os.makedirs(image_path)

    foreign_image = os.path.join(image_path, TEST_IMAGE_NAME)
    if os.path.exists(foreign_image):
      os.unlink(foreign_image)
    shutil.copy(self.image_src, foreign_image)

    pid = self._StartServer(data_dir=TEST_DATA_PATH)
    try:
      # Wait for the server to start up.
      time.sleep(1)

      request = urllib2.Request(UPDATE_URL, UPDATE_REQUEST)
      connection = urllib2.urlopen(request)
      response = connection.read()
      connection.close()
      self.assertNotEqual('', response)

      # Parse the response and check if it contains the right result.
      dom = minidom.parseString(response)
      update = dom.getElementsByTagName('updatecheck')[0]

      codebase = update.getAttribute('codebase')
      self.assertEqual('http://127.0.0.1:8080/static/' + TEST_IMAGE_NAME,
                       codebase)

      hash_value = update.getAttribute('hash')
      self.assertEqual('kGcOinJ0vA8vdYX53FN0F5BdwfY=', hash_value)

      # Try to fetch the image.
      connection = urllib2.urlopen(codebase)
      contents = connection.read()
      connection.close()
      self.assertEqual('Developers, developers, developers!\n', contents)
      os.unlink(foreign_image)
    finally:
      os.kill(pid, signal.SIGKILL)


if __name__ == '__main__':
  unittest.main()