view mercurial/policy.py @ 30762:35b516f800e0

wireproto: advertise supported media types and compression formats This commit introduces support for advertising a server's support for media types and compression formats in accordance with the spec defined in internals.wireproto. The bulk of the new code is a helper function in wireproto.py to obtain a prioritized list of compression engines available to the wire protocol. While not utilized yet, we implement support for obtaining the list of compression engines advertised by the client. The upcoming HTTP protocol enhancements are a bit lower-level than existing tests (most existing tests are command centric). So, this commit establishes a new test file that will be appropriate for holding tests around the functionality of the HTTP protocol itself. Rounding out this change, `hg debuginstall` now prints compression engines available to the server.
author Gregory Szorc <gregory.szorc@gmail.com>
date Sat, 24 Dec 2016 15:21:46 -0700
parents b4d117cee636
children 62939e0148f1
line wrap: on
line source

# policy.py - module policy logic for Mercurial.
#
# Copyright 2015 Gregory Szorc <gregory.szorc@gmail.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import os
import sys

# Rules for how modules can be loaded. Values are:
#
#    c - require C extensions
#    allow - allow pure Python implementation when C loading fails
#    cffi - required cffi versions (implemented within pure module)
#    cffi-allow - allow pure Python implementation if cffi version is missing
#    py - only load pure Python modules
#
# By default, require the C extensions for performance reasons.
policy = 'c'
policynoc = ('cffi', 'cffi-allow', 'py')
policynocffi = ('c', 'py')

try:
    from . import __modulepolicy__
    policy = __modulepolicy__.modulepolicy
except ImportError:
    pass

# PyPy doesn't load C extensions.
#
# The canonical way to do this is to test platform.python_implementation().
# But we don't import platform and don't bloat for it here.
if '__pypy__' in sys.builtin_module_names:
    policy = 'cffi'

# Our C extensions aren't yet compatible with Python 3. So use pure Python
# on Python 3 for now.
if sys.version_info[0] >= 3:
    policy = 'py'

# Environment variable can always force settings.
policy = os.environ.get('HGMODULEPOLICY', policy)