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# Copyright (C) 2010, 2011 Sebastian Thiel ([email protected]) and contributors
#
# This module is part of GitDB and is released under
# the New BSD License: http://www.opensource.org/licenses/bsd-license.php
"""Test everything about packs reading and writing"""
from gitdb.test.lib import (
    TestBase,
    with_rw_directory,
    fixture_path
)

from gitdb.stream import DeltaApplyReader

from gitdb.pack import (
    PackEntity,
    PackIndexFile,
    PackFile
)

from gitdb.base import (
    OInfo,
    OStream,
)

from gitdb.fun import delta_types
from gitdb.exc import UnsupportedOperation
from gitdb.util import to_bin_sha

import pytest

import os
import tempfile


#{ Utilities
def bin_sha_from_filename(filename):
    return to_bin_sha(os.path.splitext(os.path.basename(filename))[0][5:])
#} END utilities


class TestPack(TestBase):

    packindexfile_v1 = (fixture_path('packs/pack-c0438c19fb16422b6bbcce24387b3264416d485b.idx'), 1, 67)
    packindexfile_v2 = (fixture_path('packs/pack-11fdfa9e156ab73caae3b6da867192221f2089c2.idx'), 2, 30)
    packindexfile_v2_3_ascii = (fixture_path('packs/pack-a2bf8e71d8c18879e499335762dd95119d93d9f1.idx'), 2, 42)
    packfile_v2_1 = (fixture_path('packs/pack-c0438c19fb16422b6bbcce24387b3264416d485b.pack'), 2, packindexfile_v1[2])
    packfile_v2_2 = (fixture_path('packs/pack-11fdfa9e156ab73caae3b6da867192221f2089c2.pack'), 2, packindexfile_v2[2])
    packfile_v2_3_ascii = (
        fixture_path('packs/pack-a2bf8e71d8c18879e499335762dd95119d93d9f1.pack'), 2, packindexfile_v2_3_ascii[2])

    def _assert_index_file(self, index, version, size):
        assert index.packfile_checksum() != index.indexfile_checksum()
        assert len(index.packfile_checksum()) == 20
        assert len(index.indexfile_checksum()) == 20
        assert index.version() == version
        assert index.size() == size
        assert len(index.offsets()) == size

        # get all data of all objects
        for oidx in range(index.size()):
            sha = index.sha(oidx)
            assert oidx == index.sha_to_index(sha)

            entry = index.entry(oidx)
            assert len(entry) == 3

            assert entry[0] == index.offset(oidx)
            assert entry[1] == sha
            assert entry[2] == index.crc(oidx)

            # verify partial sha
            for l in (4, 8, 11, 17, 20):
                assert index.partial_sha_to_index(sha[:l], l * 2) == oidx

        # END for each object index in indexfile
        self.assertRaises(ValueError, index.partial_sha_to_index, "\0", 2)

    def _assert_pack_file(self, pack, version, size):
        assert pack.version() == 2
        assert pack.size() == size
        assert len(pack.checksum()) == 20

        num_obj = 0
        for obj in pack.stream_iter():
            num_obj += 1
            info = pack.info(obj.pack_offset)
            stream = pack.stream(obj.pack_offset)

            assert info.pack_offset == stream.pack_offset
            assert info.type_id == stream.type_id
            assert hasattr(stream, 'read')

            # it should be possible to read from both streams
            assert obj.read() == stream.read()

            streams = pack.collect_streams(obj.pack_offset)
            assert streams

            # read the stream
            try:
                dstream = DeltaApplyReader.new(streams)
            except ValueError:
                # ignore these, old git versions use only ref deltas,
                # which we haven't resolved ( as we are without an index )
                # Also ignore non-delta streams
                continue
            # END get deltastream

            # read all
            data = dstream.read()
            assert len(data) == dstream.size

            # test seek
            dstream.seek(0)
            assert dstream.read() == data

            # read chunks
            # NOTE: the current implementation is safe, it basically transfers
            # all calls to the underlying memory map

        # END for each object
        assert num_obj == size

    def test_pack_index(self):
        # check version 1 and 2
        for indexfile, version, size in (self.packindexfile_v1, self.packindexfile_v2):
            index = PackIndexFile(indexfile)
            self._assert_index_file(index, version, size)
        # END run tests

    def test_pack(self):
        # there is this special version 3, but apparently its like 2 ...
        for packfile, version, size in (self.packfile_v2_3_ascii, self.packfile_v2_1, self.packfile_v2_2):
            pack = PackFile(packfile)
            self._assert_pack_file(pack, version, size)
        # END for each pack to test

    @with_rw_directory
    def test_pack_entity(self, rw_dir):
        pack_objs = list()
        for packinfo, indexinfo in ((self.packfile_v2_1, self.packindexfile_v1),
                                    (self.packfile_v2_2, self.packindexfile_v2),
                                    (self.packfile_v2_3_ascii, self.packindexfile_v2_3_ascii)):
            packfile, version, size = packinfo
            indexfile, version, size = indexinfo
            entity = PackEntity(packfile)
            assert entity.pack().path() == packfile
            assert entity.index().path() == indexfile
            pack_objs.extend(entity.stream_iter())

            count = 0
            for info, stream in zip(entity.info_iter(), entity.stream_iter()):
                count += 1
                assert info.binsha == stream.binsha
                assert len(info.binsha) == 20
                assert info.type_id == stream.type_id
                assert info.size == stream.size

                # we return fully resolved items, which is implied by the sha centric access
                assert not info.type_id in delta_types

                # try all calls
                assert len(entity.collect_streams(info.binsha))
                oinfo = entity.info(info.binsha)
                assert isinstance(oinfo, OInfo)
                assert oinfo.binsha is not None
                ostream = entity.stream(info.binsha)
                assert isinstance(ostream, OStream)
                assert ostream.binsha is not None

                # verify the stream
                try:
                    assert entity.is_valid_stream(info.binsha, use_crc=True)
                except UnsupportedOperation:
                    pass
                # END ignore version issues
                assert entity.is_valid_stream(info.binsha, use_crc=False)
            # END for each info, stream tuple
            assert count == size

        # END for each entity

        # pack writing - write all packs into one
        # index path can be None
        pack_path1 = tempfile.mktemp('', "pack1", rw_dir)
        pack_path2 = tempfile.mktemp('', "pack2", rw_dir)
        index_path = tempfile.mktemp('', 'index', rw_dir)
        iteration = 0

        def rewind_streams():
            for obj in pack_objs:
                obj.stream.seek(0)
        # END utility
        for ppath, ipath, num_obj in zip((pack_path1, pack_path2),
                                         (index_path, None),
                                         (len(pack_objs), None)):
            iwrite = None
            if ipath:
                ifile = open(ipath, 'wb')
                iwrite = ifile.write
            # END handle ip

            # make sure we rewind the streams ... we work on the same objects over and over again
            if iteration > 0:
                rewind_streams()
            # END rewind streams
            iteration += 1

            with open(ppath, 'wb') as pfile:
                pack_sha, index_sha = PackEntity.write_pack(pack_objs, pfile.write, iwrite, object_count=num_obj)
            assert os.path.getsize(ppath) > 100

            # verify pack
            pf = PackFile(ppath)
            assert pf.size() == len(pack_objs)
            assert pf.version() == PackFile.pack_version_default
            assert pf.checksum() == pack_sha
            pf.close()

            # verify index
            if ipath is not None:
                ifile.close()
                assert os.path.getsize(ipath) > 100
                idx = PackIndexFile(ipath)
                assert idx.version() == PackIndexFile.index_version_default
                assert idx.packfile_checksum() == pack_sha
                assert idx.indexfile_checksum() == index_sha
                assert idx.size() == len(pack_objs)
                idx.close()
            # END verify files exist
        # END for each packpath, indexpath pair

        # verify the packs thoroughly
        rewind_streams()
        entity = PackEntity.create(pack_objs, rw_dir)
        count = 0
        for info in entity.info_iter():
            count += 1
            for use_crc in range(2):
                assert entity.is_valid_stream(info.binsha, use_crc)
            # END for each crc mode
        # END for each info
        assert count == len(pack_objs)
        entity.close()
        
    def test_pack_64(self):
        # TODO: hex-edit a pack helping us to verify that we can handle 64 byte offsets
        # of course without really needing such a huge pack
        pytest.skip('not implemented')

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