Tools/Scripts/webkitpy/common/net/networktransaction_unittest.py

# Copyright (c) 2010 Google Inc. All rights reserved.
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import unittest

from webkitpy.common.net.networktransaction import NetworkTransaction, NetworkTimeout
from webkitpy.common.system.logtesting import LoggingTestCase


class NetworkTransactionTest(LoggingTestCase):
    exception = Exception("Test exception")

    def test_success(self):
        transaction = NetworkTransaction()
        self.assertEqual(transaction.run(lambda: 42), 42)

    def _raise_exception(self):
        raise self.exception

    def test_exception(self):
        transaction = NetworkTransaction()
        did_process_exception = False
        did_throw_exception = True
        try:
            transaction.run(lambda: self._raise_exception())
            did_throw_exception = False
        except Exception as e:
            did_process_exception = True
            self.assertEqual(e, self.exception)
        self.assertTrue(did_throw_exception)
        self.assertTrue(did_process_exception)

    def _raise_500_error(self):
        self._run_count += 1
        if self._run_count < 3:
            from webkitpy.thirdparty.autoinstalled.mechanize import HTTPError
            raise HTTPError("http://example.com/", 500, "internal server error", None, None)
        return 42

    def _raise_URLError(self):
        self._run_count += 1
        if self._run_count < 3:
            from webkitpy.thirdparty.autoinstalled.mechanize import URLError
            raise URLError("[Errno 60] Operation timed out")
        return 43

    def _raise_404_error(self):
        from webkitpy.thirdparty.autoinstalled.mechanize import HTTPError
        raise HTTPError("http://foo.com/", 404, "not found", None, None)

    def test_retry_on_HTTPError(self):
        self._run_count = 0
        transaction = NetworkTransaction(initial_backoff_seconds=0)
        self.assertEqual(transaction.run(lambda: self._raise_500_error()), 42)
        self.assertEqual(self._run_count, 3)
        self.assertLog(['WARNING: Received HTTP status 500 loading "http://example.com/".  '
                        'Retrying in 0 seconds...\n',
                        'WARNING: Received HTTP status 500 loading "http://example.com/".  '
                        'Retrying in 0.0 seconds...\n'])

    def test_retry_on_URLError(self):
        self._run_count = 0
        url = "http://example.com/"
        transaction = NetworkTransaction(initial_backoff_seconds=0)
        self.assertEqual(transaction.run(lambda: self._raise_URLError(), url), 43)
        self.assertEqual(self._run_count, 3)
        self.assertLog(['WARNING: Received URLError: "[Errno 60] Operation timed out" while loading http://example.com/. '
                        'Retrying in 0 seconds...\n',
                        'WARNING: Received URLError: "[Errno 60] Operation timed out" while loading http://example.com/. '
                        'Retrying in 0.0 seconds...\n'])

    def test_convert_404_to_None(self):
        transaction = NetworkTransaction(convert_404_to_None=True)
        self.assertEqual(transaction.run(lambda: self._raise_404_error()), None)

    def test_timeout(self):
        self._run_count = 0
        transaction = NetworkTransaction(initial_backoff_seconds=60 * 60, timeout_seconds=60)
        did_process_exception = False
        did_throw_exception = True
        try:
            transaction.run(lambda: self._raise_500_error())
            did_throw_exception = False
        except NetworkTimeout as e:
            did_process_exception = True
        self.assertTrue(did_throw_exception)
        self.assertTrue(did_process_exception)