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359 lines
11 KiB
Python
359 lines
11 KiB
Python
# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2013-2017 Vinay Sajip.
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# Licensed to the Python Software Foundation under a contributor agreement.
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# See LICENSE.txt and CONTRIBUTORS.txt.
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#
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from __future__ import unicode_literals
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import bisect
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import io
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import logging
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import os
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import pkgutil
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import sys
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import types
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import zipimport
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from . import DistlibException
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from .util import cached_property, get_cache_base, Cache
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logger = logging.getLogger(__name__)
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cache = None # created when needed
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class ResourceCache(Cache):
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def __init__(self, base=None):
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if base is None:
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# Use native string to avoid issues on 2.x: see Python #20140.
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base = os.path.join(get_cache_base(), str('resource-cache'))
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super(ResourceCache, self).__init__(base)
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def is_stale(self, resource, path):
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"""
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Is the cache stale for the given resource?
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:param resource: The :class:`Resource` being cached.
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:param path: The path of the resource in the cache.
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:return: True if the cache is stale.
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"""
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# Cache invalidation is a hard problem :-)
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return True
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def get(self, resource):
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"""
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Get a resource into the cache,
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:param resource: A :class:`Resource` instance.
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:return: The pathname of the resource in the cache.
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"""
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prefix, path = resource.finder.get_cache_info(resource)
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if prefix is None:
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result = path
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else:
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result = os.path.join(self.base, self.prefix_to_dir(prefix), path)
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dirname = os.path.dirname(result)
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if not os.path.isdir(dirname):
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os.makedirs(dirname)
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if not os.path.exists(result):
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stale = True
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else:
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stale = self.is_stale(resource, path)
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if stale:
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# write the bytes of the resource to the cache location
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with open(result, 'wb') as f:
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f.write(resource.bytes)
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return result
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class ResourceBase(object):
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def __init__(self, finder, name):
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self.finder = finder
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self.name = name
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class Resource(ResourceBase):
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"""
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A class representing an in-package resource, such as a data file. This is
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not normally instantiated by user code, but rather by a
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:class:`ResourceFinder` which manages the resource.
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"""
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is_container = False # Backwards compatibility
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def as_stream(self):
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"""
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Get the resource as a stream.
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This is not a property to make it obvious that it returns a new stream
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each time.
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"""
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return self.finder.get_stream(self)
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@cached_property
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def file_path(self):
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global cache
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if cache is None:
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cache = ResourceCache()
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return cache.get(self)
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@cached_property
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def bytes(self):
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return self.finder.get_bytes(self)
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@cached_property
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def size(self):
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return self.finder.get_size(self)
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class ResourceContainer(ResourceBase):
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is_container = True # Backwards compatibility
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@cached_property
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def resources(self):
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return self.finder.get_resources(self)
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class ResourceFinder(object):
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"""
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Resource finder for file system resources.
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"""
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if sys.platform.startswith('java'):
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skipped_extensions = ('.pyc', '.pyo', '.class')
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else:
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skipped_extensions = ('.pyc', '.pyo')
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def __init__(self, module):
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self.module = module
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self.loader = getattr(module, '__loader__', None)
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self.base = os.path.dirname(getattr(module, '__file__', ''))
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def _adjust_path(self, path):
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return os.path.realpath(path)
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def _make_path(self, resource_name):
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# Issue #50: need to preserve type of path on Python 2.x
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# like os.path._get_sep
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if isinstance(resource_name, bytes): # should only happen on 2.x
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sep = b'/'
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else:
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sep = '/'
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parts = resource_name.split(sep)
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parts.insert(0, self.base)
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result = os.path.join(*parts)
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return self._adjust_path(result)
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def _find(self, path):
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return os.path.exists(path)
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def get_cache_info(self, resource):
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return None, resource.path
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def find(self, resource_name):
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path = self._make_path(resource_name)
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if not self._find(path):
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result = None
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else:
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if self._is_directory(path):
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result = ResourceContainer(self, resource_name)
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else:
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result = Resource(self, resource_name)
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result.path = path
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return result
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def get_stream(self, resource):
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return open(resource.path, 'rb')
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def get_bytes(self, resource):
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with open(resource.path, 'rb') as f:
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return f.read()
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def get_size(self, resource):
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return os.path.getsize(resource.path)
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def get_resources(self, resource):
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def allowed(f):
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return (f != '__pycache__' and not
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f.endswith(self.skipped_extensions))
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return set([f for f in os.listdir(resource.path) if allowed(f)])
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def is_container(self, resource):
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return self._is_directory(resource.path)
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_is_directory = staticmethod(os.path.isdir)
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def iterator(self, resource_name):
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resource = self.find(resource_name)
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if resource is not None:
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todo = [resource]
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while todo:
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resource = todo.pop(0)
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yield resource
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if resource.is_container:
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rname = resource.name
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for name in resource.resources:
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if not rname:
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new_name = name
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else:
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new_name = '/'.join([rname, name])
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child = self.find(new_name)
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if child.is_container:
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todo.append(child)
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else:
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yield child
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class ZipResourceFinder(ResourceFinder):
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"""
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Resource finder for resources in .zip files.
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"""
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def __init__(self, module):
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super(ZipResourceFinder, self).__init__(module)
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archive = self.loader.archive
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self.prefix_len = 1 + len(archive)
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# PyPy doesn't have a _files attr on zipimporter, and you can't set one
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if hasattr(self.loader, '_files'):
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self._files = self.loader._files
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else:
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self._files = zipimport._zip_directory_cache[archive]
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self.index = sorted(self._files)
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def _adjust_path(self, path):
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return path
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def _find(self, path):
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path = path[self.prefix_len:]
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if path in self._files:
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result = True
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else:
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if path and path[-1] != os.sep:
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path = path + os.sep
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i = bisect.bisect(self.index, path)
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try:
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result = self.index[i].startswith(path)
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except IndexError:
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result = False
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if not result:
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logger.debug('_find failed: %r %r', path, self.loader.prefix)
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else:
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logger.debug('_find worked: %r %r', path, self.loader.prefix)
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return result
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def get_cache_info(self, resource):
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prefix = self.loader.archive
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path = resource.path[1 + len(prefix):]
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return prefix, path
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def get_bytes(self, resource):
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return self.loader.get_data(resource.path)
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def get_stream(self, resource):
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return io.BytesIO(self.get_bytes(resource))
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def get_size(self, resource):
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path = resource.path[self.prefix_len:]
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return self._files[path][3]
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def get_resources(self, resource):
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path = resource.path[self.prefix_len:]
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if path and path[-1] != os.sep:
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path += os.sep
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plen = len(path)
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result = set()
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i = bisect.bisect(self.index, path)
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while i < len(self.index):
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if not self.index[i].startswith(path):
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break
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s = self.index[i][plen:]
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result.add(s.split(os.sep, 1)[0]) # only immediate children
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i += 1
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return result
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def _is_directory(self, path):
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path = path[self.prefix_len:]
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if path and path[-1] != os.sep:
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path += os.sep
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i = bisect.bisect(self.index, path)
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try:
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result = self.index[i].startswith(path)
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except IndexError:
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result = False
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return result
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_finder_registry = {
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type(None): ResourceFinder,
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zipimport.zipimporter: ZipResourceFinder
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}
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try:
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# In Python 3.6, _frozen_importlib -> _frozen_importlib_external
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try:
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import _frozen_importlib_external as _fi
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except ImportError:
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import _frozen_importlib as _fi
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_finder_registry[_fi.SourceFileLoader] = ResourceFinder
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_finder_registry[_fi.FileFinder] = ResourceFinder
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# See issue #146
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_finder_registry[_fi.SourcelessFileLoader] = ResourceFinder
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del _fi
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except (ImportError, AttributeError):
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pass
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def register_finder(loader, finder_maker):
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_finder_registry[type(loader)] = finder_maker
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_finder_cache = {}
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def finder(package):
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"""
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Return a resource finder for a package.
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:param package: The name of the package.
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:return: A :class:`ResourceFinder` instance for the package.
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"""
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if package in _finder_cache:
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result = _finder_cache[package]
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else:
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if package not in sys.modules:
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__import__(package)
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module = sys.modules[package]
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path = getattr(module, '__path__', None)
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if path is None:
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raise DistlibException('You cannot get a finder for a module, '
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'only for a package')
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loader = getattr(module, '__loader__', None)
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finder_maker = _finder_registry.get(type(loader))
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if finder_maker is None:
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raise DistlibException('Unable to locate finder for %r' % package)
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result = finder_maker(module)
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_finder_cache[package] = result
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return result
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_dummy_module = types.ModuleType(str('__dummy__'))
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def finder_for_path(path):
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"""
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Return a resource finder for a path, which should represent a container.
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:param path: The path.
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:return: A :class:`ResourceFinder` instance for the path.
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"""
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result = None
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# calls any path hooks, gets importer into cache
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pkgutil.get_importer(path)
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loader = sys.path_importer_cache.get(path)
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finder = _finder_registry.get(type(loader))
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if finder:
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module = _dummy_module
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module.__file__ = os.path.join(path, '')
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module.__loader__ = loader
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result = finder(module)
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return result
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