dulwich/dulwich/tests/test_server.py

# test_server.py -- Tests for the git server
# Copyright (C) 2010 Google, Inc.
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2
# or (at your option) any later version of the License.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA  02110-1301, USA.


"""Tests for the smart protocol server."""


from cStringIO import StringIO
from unittest import TestCase

from dulwich.errors import (
    GitProtocolError,
    )
from dulwich.server import (
    UploadPackHandler,
    ProtocolGraphWalker,
    SingleAckGraphWalkerImpl,
    MultiAckGraphWalkerImpl,
    MultiAckDetailedGraphWalkerImpl,
    )

from dulwich.protocol import (
    SINGLE_ACK,
    MULTI_ACK,
    )

ONE = '1' * 40
TWO = '2' * 40
THREE = '3' * 40
FOUR = '4' * 40
FIVE = '5' * 40

class TestProto(object):
    def __init__(self):
        self._output = []
        self._received = {0: [], 1: [], 2: [], 3: []}

    def set_output(self, output_lines):
        self._output = ['%s\n' % line.rstrip() for line in output_lines]

    def read_pkt_line(self):
        if self._output:
            return self._output.pop(0)
        else:
            return None

    def write_sideband(self, band, data):
        self._received[band].append(data)

    def write_pkt_line(self, data):
        if data is None:
            data = 'None'
        self._received[0].append(data)

    def get_received_line(self, band=0):
        lines = self._received[band]
        if lines:
            return lines.pop(0)
        else:
            return None


class UploadPackHandlerTestCase(TestCase):
    def setUp(self):
        self._handler = UploadPackHandler(None, None, None)

    def test_set_client_capabilities(self):
        try:
            self._handler.set_client_capabilities([])
        except GitProtocolError:
            self.fail()

        try:
            self._handler.set_client_capabilities([
                'multi_ack', 'side-band-64k', 'thin-pack', 'ofs-delta'])
        except GitProtocolError:
            self.fail()

    def test_set_client_capabilities_error(self):
        self.assertRaises(GitProtocolError,
                          self._handler.set_client_capabilities,
                          ['weird_ack_level', 'ofs-delta'])
        try:
            self._handler.set_client_capabilities(['include-tag'])
        except GitProtocolError:
            self.fail()


class TestCommit(object):
    def __init__(self, sha, parents, commit_time):
        self.id = sha
        self._parents = parents
        self.commit_time = commit_time

    def get_parents(self):
        return self._parents

    def __repr__(self):
        return '%s(%s)' % (self.__class__.__name__, self._sha)


class TestBackend(object):
    def __init__(self, objects):
        self.object_store = objects


class TestHandler(object):
    def __init__(self, objects, proto):
        self.backend = TestBackend(objects)
        self.proto = proto
        self.stateless_rpc = False
        self.advertise_refs = False

    def capabilities(self):
        return 'multi_ack'


class ProtocolGraphWalkerTestCase(TestCase):
    def setUp(self):
        # Create the following commit tree:
        #   3---5
        #  /
        # 1---2---4
        self._objects = {
            ONE: TestCommit(ONE, [], 111),
            TWO: TestCommit(TWO, [ONE], 222),
            THREE: TestCommit(THREE, [ONE], 333),
            FOUR: TestCommit(FOUR, [TWO], 444),
            FIVE: TestCommit(FIVE, [THREE], 555),
            }
        self._walker = ProtocolGraphWalker(
            TestHandler(self._objects, TestProto()))

    def test_is_satisfied_no_haves(self):
        self.assertFalse(self._walker._is_satisfied([], ONE, 0))
        self.assertFalse(self._walker._is_satisfied([], TWO, 0))
        self.assertFalse(self._walker._is_satisfied([], THREE, 0))

    def test_is_satisfied_have_root(self):
        self.assertTrue(self._walker._is_satisfied([ONE], ONE, 0))
        self.assertTrue(self._walker._is_satisfied([ONE], TWO, 0))
        self.assertTrue(self._walker._is_satisfied([ONE], THREE, 0))

    def test_is_satisfied_have_branch(self):
        self.assertTrue(self._walker._is_satisfied([TWO], TWO, 0))
        # wrong branch
        self.assertFalse(self._walker._is_satisfied([TWO], THREE, 0))

    def test_all_wants_satisfied(self):
        self._walker.set_wants([FOUR, FIVE])
        # trivial case: wants == haves
        self.assertTrue(self._walker.all_wants_satisfied([FOUR, FIVE]))
        # cases that require walking the commit tree
        self.assertTrue(self._walker.all_wants_satisfied([ONE]))
        self.assertFalse(self._walker.all_wants_satisfied([TWO]))
        self.assertFalse(self._walker.all_wants_satisfied([THREE]))
        self.assertTrue(self._walker.all_wants_satisfied([TWO, THREE]))

    def test_read_proto_line(self):
        self._walker.proto.set_output([
            'want %s' % ONE,
            'want %s' % TWO,
            'have %s' % THREE,
            'foo %s' % FOUR,
            'bar',
            'done',
            ])
        self.assertEquals(('want', ONE), self._walker.read_proto_line())
        self.assertEquals(('want', TWO), self._walker.read_proto_line())
        self.assertEquals(('have', THREE), self._walker.read_proto_line())
        self.assertRaises(GitProtocolError, self._walker.read_proto_line)
        self.assertRaises(GitProtocolError, self._walker.read_proto_line)
        self.assertEquals(('done', None), self._walker.read_proto_line())
        self.assertEquals((None, None), self._walker.read_proto_line())

    def test_determine_wants(self):
        self.assertRaises(GitProtocolError, self._walker.determine_wants, {})

        self._walker.proto.set_output([
            'want %s multi_ack' % ONE,
            'want %s' % TWO,
            ])
        heads = {'ref1': ONE, 'ref2': TWO, 'ref3': THREE}
        self.assertEquals([ONE, TWO], self._walker.determine_wants(heads))

        self._walker.proto.set_output(['want %s multi_ack' % FOUR])
        self.assertRaises(GitProtocolError, self._walker.determine_wants, heads)

        self._walker.proto.set_output([])
        self.assertEquals([], self._walker.determine_wants(heads))

        self._walker.proto.set_output(['want %s multi_ack' % ONE, 'foo'])
        self.assertRaises(GitProtocolError, self._walker.determine_wants, heads)

        self._walker.proto.set_output(['want %s multi_ack' % FOUR])
        self.assertRaises(GitProtocolError, self._walker.determine_wants, heads)

    # TODO: test commit time cutoff


class TestProtocolGraphWalker(object):
    def __init__(self):
        self.acks = []
        self.lines = []
        self.done = False
        self.stateless_rpc = False
        self.advertise_refs = False

    def read_proto_line(self):
        return self.lines.pop(0)

    def send_ack(self, sha, ack_type=''):
        self.acks.append((sha, ack_type))

    def send_nak(self):
        self.acks.append((None, 'nak'))

    def all_wants_satisfied(self, haves):
        return self.done

    def pop_ack(self):
        if not self.acks:
            return None
        return self.acks.pop(0)


class AckGraphWalkerImplTestCase(TestCase):
    """Base setup and asserts for AckGraphWalker tests."""
    def setUp(self):
        self._walker = TestProtocolGraphWalker()
        self._walker.lines = [
            ('have', TWO),
            ('have', ONE),
            ('have', THREE),
            ('done', None),
            ]
        self._impl = self.impl_cls(self._walker)

    def assertNoAck(self):
        self.assertEquals(None, self._walker.pop_ack())

    def assertAcks(self, acks):
        for sha, ack_type in acks:
            self.assertEquals((sha, ack_type), self._walker.pop_ack())
        self.assertNoAck()

    def assertAck(self, sha, ack_type=''):
        self.assertAcks([(sha, ack_type)])

    def assertNak(self):
        self.assertAck(None, 'nak')

    def assertNextEquals(self, sha):
        self.assertEquals(sha, self._impl.next())


class SingleAckGraphWalkerImplTestCase(AckGraphWalkerImplTestCase):
    impl_cls = SingleAckGraphWalkerImpl

    def test_single_ack(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self._walker.done = True
        self._impl.ack(ONE)
        self.assertAck(ONE)

        self.assertNextEquals(THREE)
        self._impl.ack(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNoAck()

    def test_single_ack_flush(self):
        # same as ack test but ends with a flush-pkt instead of done
        self._walker.lines[-1] = (None, None)

        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self._walker.done = True
        self._impl.ack(ONE)
        self.assertAck(ONE)

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNoAck()

    def test_single_ack_nak(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNoAck()

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNak()

    def test_single_ack_nak_flush(self):
        # same as nak test but ends with a flush-pkt instead of done
        self._walker.lines[-1] = (None, None)

        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNoAck()

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNak()

class MultiAckGraphWalkerImplTestCase(AckGraphWalkerImplTestCase):
    impl_cls = MultiAckGraphWalkerImpl

    def test_multi_ack(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self._walker.done = True
        self._impl.ack(ONE)
        self.assertAck(ONE, 'continue')

        self.assertNextEquals(THREE)
        self._impl.ack(THREE)
        self.assertAck(THREE, 'continue')

        self.assertNextEquals(None)
        self.assertAck(THREE)

    def test_multi_ack_partial(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self._impl.ack(ONE)
        self.assertAck(ONE, 'continue')

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        # done, re-send ack of last common
        self.assertAck(ONE)

    def test_multi_ack_flush(self):
        self._walker.lines = [
            ('have', TWO),
            (None, None),
            ('have', ONE),
            ('have', THREE),
            ('done', None),
            ]
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNak() # nak the flush-pkt

        self._walker.done = True
        self._impl.ack(ONE)
        self.assertAck(ONE, 'continue')

        self.assertNextEquals(THREE)
        self._impl.ack(THREE)
        self.assertAck(THREE, 'continue')

        self.assertNextEquals(None)
        self.assertAck(THREE)

    def test_multi_ack_nak(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNoAck()

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNak()

class MultiAckDetailedGraphWalkerImplTestCase(AckGraphWalkerImplTestCase):
    impl_cls = MultiAckDetailedGraphWalkerImpl

    def test_multi_ack(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self._walker.done = True
        self._impl.ack(ONE)
        self.assertAcks([(ONE, 'common'), (ONE, 'ready')])

        self.assertNextEquals(THREE)
        self._impl.ack(THREE)
        self.assertAck(THREE, 'ready')

        self.assertNextEquals(None)
        self.assertAck(THREE)

    def test_multi_ack_partial(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self._impl.ack(ONE)
        self.assertAck(ONE, 'common')

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        # done, re-send ack of last common
        self.assertAck(ONE)

    def test_multi_ack_flush(self):
        # same as ack test but contains a flush-pkt in the middle
        self._walker.lines = [
            ('have', TWO),
            (None, None),
            ('have', ONE),
            ('have', THREE),
            ('done', None),
            ]
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNak() # nak the flush-pkt

        self._walker.done = True
        self._impl.ack(ONE)
        self.assertAcks([(ONE, 'common'), (ONE, 'ready')])

        self.assertNextEquals(THREE)
        self._impl.ack(THREE)
        self.assertAck(THREE, 'ready')

        self.assertNextEquals(None)
        self.assertAck(THREE)

    def test_multi_ack_nak(self):
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNoAck()

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNak()

    def test_multi_ack_nak_flush(self):
        # same as nak test but contains a flush-pkt in the middle
        self._walker.lines = [
            ('have', TWO),
            (None, None),
            ('have', ONE),
            ('have', THREE),
            ('done', None),
            ]
        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNak()

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNak()

    def test_multi_ack_stateless(self):
        # transmission ends with a flush-pkt
        self._walker.lines[-1] = (None, None)
        self._walker.stateless_rpc = True

        self.assertNextEquals(TWO)
        self.assertNoAck()

        self.assertNextEquals(ONE)
        self.assertNoAck()

        self.assertNextEquals(THREE)
        self.assertNoAck()

        self.assertNextEquals(None)
        self.assertNak()