# test_server.py -- Compatibility tests for git server.
# Copyright (C) 2010 Google, Inc.
#
# Dulwich is dual-licensed under the Apache License, Version 2.0 and the GNU
# General Public License as public by the Free Software Foundation; version 2.0
# or (at your option) any later version. You can redistribute it and/or
# modify it under the terms of either of these two licenses.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# You should have received a copy of the licenses; if not, see
# <http://www.gnu.org/licenses/> for a copy of the GNU General Public License
# and <http://www.apache.org/licenses/LICENSE-2.0> for a copy of the Apache
# License, Version 2.0.
#

"""Compatibility tests between Dulwich and the cgit server.

Warning: these tests should be fairly stable, but when writing/debugging new
    tests, deadlocks may freeze the test process such that it cannot be
    Ctrl-C'ed. On POSIX systems, you can kill the tests with Ctrl-Z, "kill %".
"""

import threading
import os
import sys

from dulwich.server import (
    DictBackend,
    TCPGitServer,
    )
from dulwich.tests import skipIf
from dulwich.tests.compat.server_utils import (
    ServerTests,
    NoSideBand64kReceivePackHandler,
    )
from dulwich.tests.compat.utils import (
    CompatTestCase,
    require_git_version,
    )


@skipIf(sys.platform == 'win32',
        'Broken on windows, with very long fail time.')
class GitServerTestCase(ServerTests, CompatTestCase):
    """Tests for client/server compatibility.

    This server test case does not use side-band-64k in git-receive-pack.
    """

    protocol = 'git'

    def _handlers(self):
        return {b'git-receive-pack': NoSideBand64kReceivePackHandler}

    def _check_server(self, dul_server):
        receive_pack_handler_cls = dul_server.handlers[b'git-receive-pack']
        caps = receive_pack_handler_cls.capabilities()
        self.assertFalse(b'side-band-64k' in caps)

    def _start_server(self, repo):
        backend = DictBackend({b'/': repo})
        dul_server = TCPGitServer(backend, b'localhost', 0,
                                  handlers=self._handlers())
        self._check_server(dul_server)
        self.addCleanup(dul_server.shutdown)
        self.addCleanup(dul_server.server_close)
        threading.Thread(target=dul_server.serve).start()
        self._server = dul_server
        _, port = self._server.socket.getsockname()
        return port


@skipIf(sys.platform == 'win32',
        'Broken on windows, with very long fail time.')
class GitServerSideBand64kTestCase(GitServerTestCase):
    """Tests for client/server compatibility with side-band-64k support."""

    # side-band-64k in git-receive-pack was introduced in git 1.7.0.2
    min_git_version = (1, 7, 0, 2)

    def setUp(self):
        super(GitServerSideBand64kTestCase, self).setUp()
        # side-band-64k is broken in the windows client.
        # https://github.com/msysgit/git/issues/101
        # Fix has landed for the 1.9.3 release.
        if os.name == 'nt':
            require_git_version((1, 9, 3))

    def _handlers(self):
        return None  # default handlers include side-band-64k

    def _check_server(self, server):
        receive_pack_handler_cls = server.handlers[b'git-receive-pack']
        caps = receive_pack_handler_cls.capabilities()
        self.assertTrue(b'side-band-64k' in caps)
