view tests/testlib/ext-stream-clone-steps.py @ 50400:95acba2c29f6

encoding: avoid quadratic time complexity when json-encoding non-UTF8 strings

Apparently the code uses "+=" with a bytes object, which is linear-time, so the
whole encoding is quadratic-time. This patch makes us use a bytearray object,
instead, which has a(n amortized-)constant-time append operation.

The encoding is still not particularly fast, but at least a 10MB file
takes tens of seconds, not many hours to encode.

from mercurial import (
    encoding,
    extensions,
    streamclone,
    testing,
)


WALKED_FILE_1 = encoding.environ[b'HG_TEST_STREAM_WALKED_FILE_1']
WALKED_FILE_2 = encoding.environ[b'HG_TEST_STREAM_WALKED_FILE_2']


def _test_sync_point_walk_1(orig, repo):
    testing.write_file(WALKED_FILE_1)


def _test_sync_point_walk_2(orig, repo):
    assert repo._currentlock(repo._lockref) is None
    testing.wait_file(WALKED_FILE_2)


def uisetup(ui):
    extensions.wrapfunction(
        streamclone, '_test_sync_point_walk_1', _test_sync_point_walk_1
    )

    extensions.wrapfunction(
        streamclone, '_test_sync_point_walk_2', _test_sync_point_walk_2
    )