#!/usr/bin/env python
#
# Copyright 2014 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

"""Integration test for breakpad in content shell.

This test checks that content shell and breakpad are correctly hooked up, as
well as that the tools can symbolize a stack trace."""


import glob
import optparse
import os
import shutil
import subprocess
import sys
import tempfile


CONCURRENT_TASKS=4


def main():
  parser = optparse.OptionParser()
  parser.add_option('', '--build-dir', default='',
                    help='The build output directory.')
  parser.add_option('', '--binary', default='',
                    help='The path of the binary to generate symbols for.')
  parser.add_option('', '--no-symbols', default=False, action='store_true',
                    help='Symbols are not expected to work.')
  parser.add_option('-j', '--jobs', default=CONCURRENT_TASKS, action='store',
                    type='int', help='Number of parallel tasks to run.')
  parser.add_option('-v', '--verbose', action='store_true',
                    help='Print verbose status output.')

  (options, _) = parser.parse_args()

  if not options.build_dir:
    print "Required option --build-dir missing."
    return 1

  if not options.binary:
    print "Required option --binary missing."
    return 1

  if not os.access(options.binary, os.X_OK):
    print "Cannot find %s." % options.binary
    return 1

  failure = ''

  # Create a temporary directory to store the crash dumps and symbols in.
  crash_dir = tempfile.mkdtemp()

  try:
    print "# Generate symbols."
    breakpad_tools_dir = os.path.join(
        os.path.dirname(__file__), '..', '..', '..',
        'components', 'crash', 'content', 'tools')
    generate_symbols = os.path.join(
        breakpad_tools_dir, 'generate_breakpad_symbols.py')
    symbols_dir = os.path.join(crash_dir, 'symbols')
    cmd = [generate_symbols,
           '--build-dir=%s' % options.build_dir,
           '--binary=%s' % options.binary,
           '--symbols-dir=%s' % symbols_dir,
           '--jobs=%d' % options.jobs]
    if options.verbose:
      cmd.append('--verbose')
      print ' '.join(cmd)
    failure = 'Failed to run generate_breakpad_symbols.py.'
    subprocess.check_call(cmd)

    print "# Run content_shell and make it crash."
    cmd = [options.binary,
           '--run-layout-test',
           'chrome://crash',
           '--enable-crash-reporter',
           '--crash-dumps-dir=%s' % crash_dir]
    if options.verbose:
      print ' '.join(cmd)
    failure = 'Failed to run content_shell.'
    if options.verbose:
      subprocess.check_call(cmd)
    else:
      with open(os.devnull, 'w') as devnull:
        subprocess.check_call(cmd, stdout=devnull, stderr=devnull)

    print "# Retrieve crash dump."
    dmp_files = glob.glob(os.path.join(crash_dir, '*.dmp'))
    failure = 'Expected 1 crash dump, found %d.' % len(dmp_files)
    if len(dmp_files) != 1:
      raise Exception(failure)
    dmp_file = dmp_files[0]
    minidump = os.path.join(crash_dir, 'minidump')

    dmp_to_minidump = os.path.join(breakpad_tools_dir, 'dmp2minidump.py')
    cmd = [dmp_to_minidump, dmp_file, minidump]
    if options.verbose:
      print ' '.join(cmd)
    failure = 'Failed to run dmp_to_minidump.'
    subprocess.check_call(cmd)

    print "# Symbolize crash dump."
    minidump_stackwalk = os.path.join(options.build_dir, 'minidump_stackwalk')
    cmd = [minidump_stackwalk, minidump, symbols_dir]
    if options.verbose:
      print ' '.join(cmd)
    failure = 'Failed to run minidump_stackwalk.'
    proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stack = proc.communicate()[0]

    # Check whether the stack contains a CrashIntentionally symbol.
    found_symbol = 'CrashIntentionally' in stack

    if options.no_symbols:
      if found_symbol:
        if options.verbose:
          print stack
        failure = 'Found unexpected reference to CrashIntentionally in stack'
        raise Exception(failure)
    else:
      if not found_symbol:
        if options.verbose:
          print stack
        failure = 'Could not find reference to CrashIntentionally in stack.'
        raise Exception(failure)

  except:
    print "FAIL: %s" % failure
    return 1

  else:
    print "PASS: Breakpad integration test ran successfully."
    return 0

  finally:
    try:
      shutil.rmtree(crash_dir)
    except:
      print 'Failed to delete temp directory "%s".' % crash_dir


if '__main__' == __name__:
  sys.exit(main())