#!/usr/bin/python
# Copyright (c) 2013 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.

"""Unittests for upload_symbols.py"""

from __future__ import print_function

import BaseHTTPServer
import ctypes
import errno
import logging
import multiprocessing
import os
import signal
import socket
import SocketServer
import sys
import time
import urllib2

# We specifically set up a local server to connect to, so make sure we
# delete any proxy settings that might screw that up.  We also need to
# do it here because modules that are imported below will implicitly
# initialize with this proxy setting rather than dynamically pull it
# on the fly :(.
os.environ.pop('http_proxy', None)

sys.path.insert(0, os.path.join(os.path.dirname(os.path.realpath(__file__)),
                                '..', '..'))
from chromite.lib import cros_build_lib
from chromite.lib import cros_test_lib
from chromite.lib import osutils
from chromite.lib import parallel
from chromite.lib import parallel_unittest
from chromite.lib import remote_access
from chromite.scripts import cros_generate_breakpad_symbols
from chromite.scripts import upload_symbols

# TODO(build): Finish test wrapper (http://crosbug.com/37517).
# Until then, this has to be after the chromite imports.
import isolateserver
import mock


class SymbolServerRequestHandler(BaseHTTPServer.BaseHTTPRequestHandler):
  """HTTP handler for symbol POSTs"""

  RESP_CODE = None
  RESP_MSG = None

  def do_POST(self):
    """Handle a POST request"""
    # Drain the data from the client.  If we don't, we might write the response
    # and close the socket before the client finishes, so they die with EPIPE.
    clen = int(self.headers.get('Content-Length', '0'))
    self.rfile.read(clen)

    self.send_response(self.RESP_CODE, self.RESP_MSG)
    self.end_headers()

  def log_message(self, *args, **kwargs):
    """Stub the logger as it writes to stderr"""
    pass


class SymbolServer(SocketServer.ThreadingTCPServer, BaseHTTPServer.HTTPServer):
  """Simple HTTP server that forks each request"""


class UploadSymbolsServerTest(cros_test_lib.MockTempDirTestCase):
  """Tests for UploadSymbols() and a local HTTP server"""

  SYM_CONTENTS = """MODULE Linux arm 123-456 blkid
PUBLIC 1471 0 main"""

  def SpawnServer(self, RequestHandler):
    """Spawn a new http server"""
    while True:
      try:
        port = remote_access.GetUnusedPort()
        address = ('', port)
        self.httpd = SymbolServer(address, RequestHandler)
        break
      except socket.error as e:
        if e.errno == errno.EADDRINUSE:
          continue
        raise
    self.server = 'http://localhost:%i' % port
    self.httpd_pid = os.fork()
    if self.httpd_pid == 0:
      self.httpd.serve_forever(poll_interval=0.1)
      sys.exit(0)

  def setUp(self):
    self.httpd_pid = None
    self.httpd = None
    self.server = None
    self.sym_file = os.path.join(self.tempdir, 'test.sym')
    osutils.WriteFile(self.sym_file, self.SYM_CONTENTS)

  def tearDown(self):
    # Only kill the server if we forked one.
    if self.httpd_pid:
      os.kill(self.httpd_pid, signal.SIGUSR1)

  def testSuccess(self):
    """The server returns success for all uploads"""
    class Handler(SymbolServerRequestHandler):
      """Always return 200"""
      RESP_CODE = 200

    self.SpawnServer(Handler)
    ret = upload_symbols.UploadSymbols('', server=self.server, sleep=0,
                                       sym_paths=[self.sym_file] * 10,
                                       retry=False)
    self.assertEqual(ret, 0)

  def testError(self):
    """The server returns errors for all uploads"""
    class Handler(SymbolServerRequestHandler):
      """Always return 500"""
      RESP_CODE = 500
      RESP_MSG = 'Internal Server Error'

    self.SpawnServer(Handler)
    ret = upload_symbols.UploadSymbols('', server=self.server, sleep=0,
                                       sym_paths=[self.sym_file] * 10,
                                       retry=False)
    self.assertEqual(ret, 4)

  def testHungServer(self):
    """The server chokes, but we recover"""
    class Handler(SymbolServerRequestHandler):
      """All connections choke forever"""
      def do_POST(self):
        while True:
          time.sleep(1000)

    self.SpawnServer(Handler)
    with mock.patch.object(upload_symbols, 'GetUploadTimeout') as m:
      m.return_value = 0.1
      ret = upload_symbols.UploadSymbols('', server=self.server, sleep=0,
                                         sym_paths=[self.sym_file] * 10,
                                         retry=False)
    self.assertEqual(ret, 4)


class UploadSymbolsTest(cros_test_lib.MockTempDirTestCase):
  """Tests for UploadSymbols()"""

  def setUp(self):
    for d in ('foo', 'bar', 'some/dir/here'):
      d = os.path.join(self.tempdir, d)
      osutils.SafeMakedirs(d)
      for f in ('ignored', 'real.sym', 'no.sym.here'):
        f = os.path.join(d, f)
        osutils.Touch(f)
    self.sym_paths = [
        'bar/real.sym',
        'foo/real.sym',
        'some/dir/here/real.sym',
    ]

    self.upload_mock = self.PatchObject(upload_symbols, 'UploadSymbol')
    self.PatchObject(cros_generate_breakpad_symbols, 'ReadSymsHeader',
                     return_value=cros_generate_breakpad_symbols.SymbolHeader(
                         os='os', cpu='cpu', id='id', name='name'))

  def _testUploadURL(self, official, expected_url):
    """Helper for checking the url used"""
    self.upload_mock.return_value = 0
    with parallel_unittest.ParallelMock():
      ret = upload_symbols.UploadSymbols('', official=official, retry=False,
                                         breakpad_dir=self.tempdir, sleep=0)
      self.assertEqual(ret, 0)
      self.assertEqual(self.upload_mock.call_count, 3)
      for call_args in self.upload_mock.call_args_list:
        url, sym_item = call_args[0]
        self.assertEqual(url, expected_url)
        self.assertTrue(sym_item.sym_file.endswith('.sym'))

  def testOfficialUploadURL(self):
    """Verify we upload to the real crash server for official builds"""
    self._testUploadURL(True, upload_symbols.OFFICIAL_UPLOAD_URL)

  def testUnofficialUploadURL(self):
    """Verify we upload to the staging crash server for unofficial builds"""
    self._testUploadURL(False, upload_symbols.STAGING_UPLOAD_URL)

  def testUploadSymbolFailureSimple(self):
    """Verify that when UploadSymbol fails, the error count is passed up"""
    def UploadSymbol(*_args, **kwargs):
      kwargs['num_errors'].value = 4
    self.upload_mock.side_effect = UploadSymbol
    with parallel_unittest.ParallelMock():
      ret = upload_symbols.UploadSymbols('', breakpad_dir=self.tempdir, sleep=0,
                                         retry=False)
      self.assertEquals(ret, 4)

  def testUploadCount(self):
    """Verify we can limit the number of uploaded symbols"""
    self.upload_mock.return_value = 0
    for c in xrange(3):
      self.upload_mock.reset_mock()
      with parallel_unittest.ParallelMock():
        ret = upload_symbols.UploadSymbols('', breakpad_dir=self.tempdir,
                                           sleep=0, upload_limit=c)
        self.assertEquals(ret, 0)
        self.assertEqual(self.upload_mock.call_count, c)

  def testFailedFileList(self):
    """Verify the failed file list is populated with the right content"""
    def UploadSymbol(*args, **kwargs):
      kwargs['failed_queue'].put(args[1].sym_file)
      kwargs['num_errors'].value = 4
    self.upload_mock.side_effect = UploadSymbol
    with parallel_unittest.ParallelMock():
      failed_list = os.path.join(self.tempdir, 'list')
      ret = upload_symbols.UploadSymbols('', breakpad_dir=self.tempdir, sleep=0,
                                         retry=False, failed_list=failed_list)
      self.assertEquals(ret, 4)

      # Need to sort the output as parallel/fs discovery can be unordered.
      got_list = sorted(osutils.ReadFile(failed_list).splitlines())
      self.assertEquals(self.sym_paths, got_list)

  def _testUpload(self, inputs, sym_paths=None):
    """Helper for testing uploading of specific paths"""
    if sym_paths is None:
      sym_paths = inputs

    self.upload_mock.return_value = 0
    with parallel_unittest.ParallelMock():
      ret = upload_symbols.UploadSymbols(sym_paths=inputs, sleep=0,
                                         retry=False)
      self.assertEquals(ret, 0)
      self.assertEquals(self.upload_mock.call_count, len(sym_paths))

      # Since upload order is arbitrary, we have to do a manual scan for each
      # path ourselves against the uploaded file list.
      found_syms = [x[0][1].sym_file for x in self.upload_mock.call_args_list]
      for found_sym in found_syms:
        for path in sym_paths:
          if found_sym.endswith(path):
            break
        else:
          raise AssertionError('Could not locate %s in %r' % (path, found_syms))

  def testUploadFiles(self):
    """Test uploading specific symbol files"""
    sym_paths = (
        os.path.join(self.tempdir, 'bar', 'real.sym'),
        os.path.join(self.tempdir, 'foo', 'real.sym'),
    )
    self._testUpload(sym_paths)

  def testUploadDirectory(self):
    """Test uploading directory of symbol files"""
    self._testUpload([self.tempdir], sym_paths=self.sym_paths)

  def testUploadLocalTarball(self):
    """Test uploading symbols contains in a local tarball"""
    tarball = os.path.join(self.tempdir, 'syms.tar.gz')
    cros_build_lib.CreateTarball(
        'syms.tar.gz', self.tempdir, compression=cros_build_lib.COMP_GZIP,
        inputs=('foo', 'bar', 'some'))
    self._testUpload([tarball], sym_paths=self.sym_paths)

  def testUploadRemoteTarball(self):
    """Test uploading symbols contains in a remote tarball"""
    # TODO: Need to figure out how to mock out lib.cache.TarballCache.

  def testDedupeNotifyFailure(self):
    """Test that a dedupe server failure midway doesn't wedge things"""
    api_mock = mock.MagicMock()

    def _Contains(items):
      """Do not dedupe anything"""
      return items
    api_mock.contains.side_effect = _Contains

    # Use a list so the closure below can modify the value.
    item_count = [0]
    # Pick a number big enough to trigger a hang normally, but not so
    # big it adds a lot of overhead.
    item_limit = 50
    def _Push(*_args):
      """Die in the middle of the push list"""
      item_count[0] += 1
      if item_count[0] > (item_limit / 10):
        raise ValueError('time to die')
    api_mock.push.side_effect = _Push

    self.PatchObject(isolateserver, 'get_storage_api', return_value=api_mock)

    def _Uploader(*args, **kwargs):
      """Pass the uploaded symbol to the deduper"""
      sym_item = args[1]
      passed_queue = kwargs['passed_queue']
      passed_queue.put(sym_item)
    self.upload_mock.side_effect = _Uploader

    self.upload_mock.return_value = 0
    with parallel_unittest.ParallelMock():
      ret = upload_symbols.UploadSymbols(
          '', sym_paths=[self.tempdir] * item_limit, sleep=0,
          dedupe_namespace='inva!id name$pace')
      self.assertEqual(ret, 0)
      # This test normally passes by not hanging.

  def testSlowDedupeSystem(self):
    """Verify a slow-to-join process doesn't break things when dedupe is off"""
    # The sleep value here is inherently a little racy, but seems to be good
    # enough to trigger the bug on a semi-regular basis on developer systems.
    self.PatchObject(upload_symbols, 'SymbolDeduplicatorNotify',
                     side_effect=lambda *args: time.sleep(1))
    # Test passing means the code didn't throw an exception.
    upload_symbols.UploadSymbols(sym_paths=[self.tempdir])


class SymbolDeduplicatorNotifyTest(cros_test_lib.MockTestCase):
  """Tests for SymbolDeduplicatorNotify()"""

  def setUp(self):
    self.storage_mock = self.PatchObject(isolateserver, 'get_storage_api')

  def testSmoke(self):
    """Basic run through the system."""
    q = mock.MagicMock()
    q.get.side_effect = (upload_symbols.FakeItem(), None,)
    upload_symbols.SymbolDeduplicatorNotify('name', q)

  def testStorageException(self):
    """We want to just warn & move on when dedupe server fails"""
    log_mock = self.PatchObject(cros_build_lib, 'Warning')
    q = mock.MagicMock()
    q.get.side_effect = (upload_symbols.FakeItem(), None,)
    self.storage_mock.side_effect = Exception
    upload_symbols.SymbolDeduplicatorNotify('name', q)
    self.assertEqual(log_mock.call_count, 1)


class SymbolDeduplicatorTest(cros_test_lib.MockTestCase):
  """Tests for SymbolDeduplicator()"""

  def setUp(self):
    self.storage_mock = mock.MagicMock()
    self.header_mock = self.PatchObject(
        cros_generate_breakpad_symbols, 'ReadSymsHeader',
        return_value=cros_generate_breakpad_symbols.SymbolHeader(
            os='os', cpu='cpu', id='id', name='name'))

  def testNoStorageOrPaths(self):
    """We don't want to talk to the server if there's no storage or files"""
    upload_symbols.SymbolDeduplicator(None, [])
    upload_symbols.SymbolDeduplicator(self.storage_mock, [])
    self.assertEqual(self.storage_mock.call_count, 0)
    self.assertEqual(self.header_mock.call_count, 0)

  def testStorageException(self):
    """We want to just warn & move on when dedupe server fails"""
    log_mock = self.PatchObject(cros_build_lib, 'Warning')
    self.storage_mock.contains.side_effect = Exception('storage error')
    sym_paths = ['/a', '/bbbbbb', '/cc.c']
    ret = upload_symbols.SymbolDeduplicator(self.storage_mock, sym_paths)
    self.assertEqual(log_mock.call_count, 1)
    self.assertEqual(self.storage_mock.contains.call_count, 1)
    self.assertEqual(self.header_mock.call_count, len(sym_paths))
    self.assertEqual(len(ret), len(sym_paths))


class UploadSymbolTest(cros_test_lib.MockTempDirTestCase):
  """Tests for UploadSymbol()"""

  def setUp(self):
    self.sym_file = os.path.join(self.tempdir, 'foo.sym')
    self.sym_item = upload_symbols.FakeItem(sym_file=self.sym_file)
    self.url = 'http://eatit'
    self.upload_mock = self.PatchObject(upload_symbols, 'SymUpload')

  def testUploadSymbolNormal(self):
    """Verify we try to upload on a normal file"""
    osutils.Touch(self.sym_file)
    ret = upload_symbols.UploadSymbol(self.url, self.sym_item)
    self.assertEqual(ret, 0)
    self.upload_mock.assert_called_with(self.url, self.sym_item)
    self.assertEqual(self.upload_mock.call_count, 1)

  def testUploadSymbolErrorCountExceeded(self):
    """Verify that when the error count gets too high, we stop uploading"""
    errors = ctypes.c_int(10000)
    # Pass in garbage values so that we crash if num_errors isn't handled.
    ret = upload_symbols.UploadSymbol(None, self.sym_item, sleep=None,
                                      num_errors=errors)
    self.assertEqual(ret, 0)

  def testUploadRetryErrors(self, side_effect=None):
    """Verify that we retry errors (and eventually give up)"""
    if not side_effect:
      side_effect = urllib2.HTTPError('http://', 400, 'fail', {}, None)
    self.upload_mock.side_effect = side_effect
    errors = ctypes.c_int()
    item = upload_symbols.FakeItem(sym_file='/dev/null')
    ret = upload_symbols.UploadSymbol(self.url, item, num_errors=errors)
    self.assertEqual(ret, 1)
    self.upload_mock.assert_called_with(self.url, item)
    self.assertTrue(self.upload_mock.call_count >= upload_symbols.MAX_RETRIES)

  def testConnectRetryErrors(self):
    """Verify that we retry errors (and eventually give up) w/connect errors"""
    side_effect = urllib2.URLError('foo')
    self.testUploadRetryErrors(side_effect=side_effect)

  def testTruncateTooBigFiles(self):
    """Verify we shrink big files"""
    def SymUpload(_url, sym_item):
      content = osutils.ReadFile(sym_item.sym_file)
      self.assertEqual(content, 'some junk\n')
    self.upload_mock.upload_mock.side_effect = SymUpload
    content = '\n'.join((
        'STACK CFI 1234',
        'some junk',
        'STACK CFI 1234',
    ))
    osutils.WriteFile(self.sym_file, content)
    ret = upload_symbols.UploadSymbol(self.url, self.sym_item, file_limit=1)
    self.assertEqual(ret, 0)
    # Make sure the item passed to the upload has a temp file and not the
    # original -- only the temp one has been stripped down.
    temp_item = self.upload_mock.call_args[0][1]
    self.assertNotEqual(temp_item.sym_file, self.sym_item.sym_file)
    self.assertEqual(self.upload_mock.call_count, 1)

  def testTruncateReallyLargeFiles(self):
    """Verify we try to shrink really big files"""
    warn_mock = self.PatchObject(cros_build_lib, 'PrintBuildbotStepWarnings')
    with open(self.sym_file, 'w+b') as f:
      f.truncate(upload_symbols.CRASH_SERVER_FILE_LIMIT + 100)
      f.seek(0)
      f.write('STACK CFI 1234\n\n')
    ret = upload_symbols.UploadSymbol(self.url, self.sym_item)
    self.assertEqual(ret, 0)
    # Make sure the item passed to the upload has a temp file and not the
    # original -- only the temp one has been truncated.
    temp_item = self.upload_mock.call_args[0][1]
    self.assertNotEqual(temp_item.sym_file, self.sym_item.sym_file)
    self.assertEqual(self.upload_mock.call_count, 1)
    self.assertEqual(warn_mock.call_count, 1)


class SymUploadTest(cros_test_lib.MockTempDirTestCase):
  """Tests for SymUpload()"""

  SYM_URL = 'http://localhost/post/it/here'
  SYM_CONTENTS = """MODULE Linux arm 123-456 blkid
PUBLIC 1471 0 main"""

  def setUp(self):
    self.sym_file = os.path.join(self.tempdir, 'test.sym')
    osutils.WriteFile(self.sym_file, self.SYM_CONTENTS)
    self.sym_item = upload_symbols.SymbolItem(self.sym_file)

  def testPostUpload(self):
    """Verify HTTP POST has all the fields we need"""
    m = self.PatchObject(urllib2, 'urlopen', autospec=True)
    upload_symbols.SymUpload(self.SYM_URL, self.sym_item)
    self.assertEquals(m.call_count, 1)
    req = m.call_args[0][0]
    self.assertEquals(req.get_full_url(), self.SYM_URL)
    data = ''.join([x for x in req.get_data()])

    fields = {
        'code_file': 'blkid',
        'debug_file': 'blkid',
        'debug_identifier': '123456',
        'os': 'Linux',
        'cpu': 'arm',
    }
    for key, val in fields.iteritems():
      line = 'Content-Disposition: form-data; name="%s"\r\n' % key
      self.assertTrue(line in data)
      line = '%s\r\n' % val
      self.assertTrue(line in data)
    line = ('Content-Disposition: form-data; name="symbol_file"; '
            'filename="test.sym"\r\n')
    self.assertTrue(line in data)
    self.assertTrue(self.SYM_CONTENTS in data)

  def testTimeout(self):
    """Verify timeouts scale based on filesize"""
    m = self.PatchObject(urllib2, 'urlopen', autospec=True)
    size = self.PatchObject(os.path, 'getsize')

    tests = (
        # Small files should get rounded up to the minimum timeout.
        (10, upload_symbols.UPLOAD_MIN_TIMEOUT),
        # A 50MiB file should take like ~4 minutes.
        (50 * 1024 * 1024, 257),
    )
    for size.return_value, timeout in tests:
      upload_symbols.SymUpload(self.SYM_URL, self.sym_item)
      self.assertEqual(m.call_args[1]['timeout'], timeout)


class UtilTest(cros_test_lib.TempDirTestCase):
  """Various tests for utility funcs."""

  def testWriteQueueToFile(self):
    """Basic test for WriteQueueToFile."""
    listing = os.path.join(self.tempdir, 'list')
    exp_list = [
        'b/c.txt',
        'foo.log',
        'there/might/be/giants',
    ]
    relpath = '/a'

    q = multiprocessing.Queue()
    for f in exp_list:
      q.put(os.path.join(relpath, f))
    q.put(None)
    upload_symbols.WriteQueueToFile(listing, q, '/a')

    got_list = osutils.ReadFile(listing).splitlines()
    self.assertEquals(exp_list, got_list)


if __name__ == '__main__':
  # pylint: disable=W0212
  # Set timeouts small so that if the unit test hangs, it won't hang for long.
  parallel._BackgroundTask.STARTUP_TIMEOUT = 5
  parallel._BackgroundTask.EXIT_TIMEOUT = 5

  # We want to test retry behavior, so make sure we don't sleep.
  upload_symbols.INITIAL_RETRY_DELAY = 0

  # Run the tests.
  cros_test_lib.main(level=logging.INFO)