mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-11-14 01:00:39 +00:00
247 lines
8.1 KiB
Python
247 lines
8.1 KiB
Python
"""Discover and load entry points from installed packages."""
|
|
# Copyright (c) Thomas Kluyver and contributors
|
|
# Distributed under the terms of the MIT license; see LICENSE file.
|
|
|
|
from contextlib import contextmanager
|
|
import glob
|
|
from importlib import import_module
|
|
import io
|
|
import itertools
|
|
import os.path as osp
|
|
import re
|
|
import sys
|
|
import warnings
|
|
import zipfile
|
|
|
|
if sys.version_info[0] >= 3:
|
|
import configparser
|
|
else:
|
|
from backports import configparser
|
|
|
|
entry_point_pattern = re.compile(r"""
|
|
(?P<modulename>\w+(\.\w+)*)
|
|
(:(?P<objectname>\w+(\.\w+)*))?
|
|
\s*
|
|
(\[(?P<extras>.+)\])?
|
|
$
|
|
""", re.VERBOSE)
|
|
|
|
file_in_zip_pattern = re.compile(r"""
|
|
(?P<dist_version>[^/\\]+)\.(dist|egg)-info
|
|
[/\\]entry_points.txt$
|
|
""", re.VERBOSE)
|
|
|
|
__version__ = '0.3'
|
|
|
|
class BadEntryPoint(Exception):
|
|
"""Raised when an entry point can't be parsed.
|
|
"""
|
|
def __init__(self, epstr):
|
|
self.epstr = epstr
|
|
|
|
def __str__(self):
|
|
return "Couldn't parse entry point spec: %r" % self.epstr
|
|
|
|
@staticmethod
|
|
@contextmanager
|
|
def err_to_warnings():
|
|
try:
|
|
yield
|
|
except BadEntryPoint as e:
|
|
warnings.warn(str(e))
|
|
|
|
class NoSuchEntryPoint(Exception):
|
|
"""Raised by :func:`get_single` when no matching entry point is found."""
|
|
def __init__(self, group, name):
|
|
self.group = group
|
|
self.name = name
|
|
|
|
def __str__(self):
|
|
return "No {!r} entry point found in group {!r}".format(self.name, self.group)
|
|
|
|
|
|
class CaseSensitiveConfigParser(configparser.ConfigParser):
|
|
optionxform = staticmethod(str)
|
|
|
|
|
|
class EntryPoint(object):
|
|
def __init__(self, name, module_name, object_name, extras=None, distro=None):
|
|
self.name = name
|
|
self.module_name = module_name
|
|
self.object_name = object_name
|
|
self.extras = extras
|
|
self.distro = distro
|
|
|
|
def __repr__(self):
|
|
return "EntryPoint(%r, %r, %r, %r)" % \
|
|
(self.name, self.module_name, self.object_name, self.distro)
|
|
|
|
def load(self):
|
|
"""Load the object to which this entry point refers.
|
|
"""
|
|
mod = import_module(self.module_name)
|
|
obj = mod
|
|
if self.object_name:
|
|
for attr in self.object_name.split('.'):
|
|
obj = getattr(obj, attr)
|
|
return obj
|
|
|
|
@classmethod
|
|
def from_string(cls, epstr, name, distro=None):
|
|
"""Parse an entry point from the syntax in entry_points.txt
|
|
|
|
:param str epstr: The entry point string (not including 'name =')
|
|
:param str name: The name of this entry point
|
|
:param Distribution distro: The distribution in which the entry point was found
|
|
:rtype: EntryPoint
|
|
:raises BadEntryPoint: if *epstr* can't be parsed as an entry point.
|
|
"""
|
|
m = entry_point_pattern.match(epstr)
|
|
if m:
|
|
mod, obj, extras = m.group('modulename', 'objectname', 'extras')
|
|
if extras is not None:
|
|
extras = re.split(r',\s*', extras)
|
|
return cls(name, mod, obj, extras, distro)
|
|
else:
|
|
raise BadEntryPoint(epstr)
|
|
|
|
class Distribution(object):
|
|
def __init__(self, name, version):
|
|
self.name = name
|
|
self.version = version
|
|
|
|
def __repr__(self):
|
|
return "Distribution(%r, %r)" % (self.name, self.version)
|
|
|
|
|
|
def iter_files_distros(path=None, repeated_distro='first'):
|
|
if path is None:
|
|
path = sys.path
|
|
|
|
# Distributions found earlier in path will shadow those with the same name
|
|
# found later. If these distributions used different module names, it may
|
|
# actually be possible to import both, but in most cases this shadowing
|
|
# will be correct.
|
|
distro_names_seen = set()
|
|
|
|
for folder in path:
|
|
if folder.rstrip('/\\').endswith('.egg'):
|
|
# Gah, eggs
|
|
egg_name = osp.basename(folder)
|
|
if '-' in egg_name:
|
|
distro = Distribution(*egg_name.split('-')[:2])
|
|
|
|
if (repeated_distro == 'first') \
|
|
and (distro.name in distro_names_seen):
|
|
continue
|
|
distro_names_seen.add(distro.name)
|
|
else:
|
|
distro = None
|
|
|
|
if osp.isdir(folder):
|
|
ep_path = osp.join(folder, 'EGG-INFO', 'entry_points.txt')
|
|
if osp.isfile(ep_path):
|
|
cp = CaseSensitiveConfigParser(delimiters=('=',))
|
|
cp.read([ep_path])
|
|
yield cp, distro
|
|
|
|
elif zipfile.is_zipfile(folder):
|
|
z = zipfile.ZipFile(folder)
|
|
try:
|
|
info = z.getinfo('EGG-INFO/entry_points.txt')
|
|
except KeyError:
|
|
continue
|
|
cp = CaseSensitiveConfigParser(delimiters=('=',))
|
|
with z.open(info) as f:
|
|
fu = io.TextIOWrapper(f)
|
|
cp.read_file(fu,
|
|
source=osp.join(folder, 'EGG-INFO', 'entry_points.txt'))
|
|
yield cp, distro
|
|
|
|
# zip imports, not egg
|
|
elif zipfile.is_zipfile(folder):
|
|
with zipfile.ZipFile(folder) as zf:
|
|
for info in zf.infolist():
|
|
m = file_in_zip_pattern.match(info.filename)
|
|
if not m:
|
|
continue
|
|
|
|
distro_name_version = m.group('dist_version')
|
|
if '-' in distro_name_version:
|
|
distro = Distribution(*distro_name_version.split('-', 1))
|
|
|
|
if (repeated_distro == 'first') \
|
|
and (distro.name in distro_names_seen):
|
|
continue
|
|
distro_names_seen.add(distro.name)
|
|
else:
|
|
distro = None
|
|
|
|
cp = CaseSensitiveConfigParser(delimiters=('=',))
|
|
with zf.open(info) as f:
|
|
fu = io.TextIOWrapper(f)
|
|
cp.read_file(fu, source=osp.join(folder, info.filename))
|
|
yield cp, distro
|
|
|
|
# Regular file imports (not egg, not zip file)
|
|
for path in itertools.chain(
|
|
glob.iglob(osp.join(folder, '*.dist-info', 'entry_points.txt')),
|
|
glob.iglob(osp.join(folder, '*.egg-info', 'entry_points.txt'))
|
|
):
|
|
distro_name_version = osp.splitext(osp.basename(osp.dirname(path)))[0]
|
|
if '-' in distro_name_version:
|
|
distro = Distribution(*distro_name_version.split('-', 1))
|
|
|
|
if (repeated_distro == 'first') \
|
|
and (distro.name in distro_names_seen):
|
|
continue
|
|
distro_names_seen.add(distro.name)
|
|
else:
|
|
distro = None
|
|
cp = CaseSensitiveConfigParser(delimiters=('=',))
|
|
cp.read([path])
|
|
yield cp, distro
|
|
|
|
def get_single(group, name, path=None):
|
|
"""Find a single entry point.
|
|
|
|
Returns an :class:`EntryPoint` object, or raises :exc:`NoSuchEntryPoint`
|
|
if no match is found.
|
|
"""
|
|
for config, distro in iter_files_distros(path=path):
|
|
if (group in config) and (name in config[group]):
|
|
epstr = config[group][name]
|
|
with BadEntryPoint.err_to_warnings():
|
|
return EntryPoint.from_string(epstr, name, distro)
|
|
|
|
raise NoSuchEntryPoint(group, name)
|
|
|
|
def get_group_named(group, path=None):
|
|
"""Find a group of entry points with unique names.
|
|
|
|
Returns a dictionary of names to :class:`EntryPoint` objects.
|
|
"""
|
|
result = {}
|
|
for ep in get_group_all(group, path=path):
|
|
if ep.name not in result:
|
|
result[ep.name] = ep
|
|
return result
|
|
|
|
def get_group_all(group, path=None):
|
|
"""Find all entry points in a group.
|
|
|
|
Returns a list of :class:`EntryPoint` objects.
|
|
"""
|
|
result = []
|
|
for config, distro in iter_files_distros(path=path):
|
|
if group in config:
|
|
for name, epstr in config[group].items():
|
|
with BadEntryPoint.err_to_warnings():
|
|
result.append(EntryPoint.from_string(epstr, name, distro))
|
|
|
|
return result
|
|
|
|
if __name__ == '__main__':
|
|
import pprint
|
|
pprint.pprint(get_group_all('console_scripts'))
|