zipextimporter.py
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r"""zipextimporter - an importer which can import extension modules from zipfiles
This file and also _memimporter.pyd is part of the py2exe package.
Overview
========
zipextimporter.py contains the ZipExtImporter class which allows to
load Python binary extension modules contained in a zip.archive,
without unpacking them to the file system.
Call the zipextimporter.install() function to install the import hook,
add a zip-file containing .pyd or .dll extension modules to sys.path,
and import them.
It uses the _memimporter extension which uses code from Joachim
Bauch's MemoryModule library. This library emulates the win32 api
function LoadLibrary.
Sample usage
============
You have to prepare a zip-archive 'lib.zip' containing
your Python's _socket.pyd for this example to work.
>>> import zipextimporter
>>> zipextimporter.install()
>>> import sys
>>> sys.path.insert(0, "lib.zip")
>>> import _socket
>>> print _socket
<module '_socket' from 'lib.zip\_socket.pyd'>
>>> _socket.__file__
'lib.zip\\_socket.pyd'
>>> _socket.__loader__
<ZipExtensionImporter object 'lib.zip'>
>>> # Reloading also works correctly:
>>> _socket is reload(_socket)
True
>>>
"""
import imp, sys
import zipimport
import _memimporter
class ZipExtensionImporter(zipimport.zipimporter):
_suffixes = [s[0] for s in imp.get_suffixes() if s[2] == imp.C_EXTENSION]
def find_module(self, fullname, path=None):
result = zipimport.zipimporter.find_module(self, fullname, path)
if result:
return result
if fullname in ("pywintypes", "pythoncom"):
fullname = fullname + "%d%d" % sys.version_info[:2]
fullname = fullname.replace(".", "\\") + ".dll"
if fullname in self._files:
return self
else:
fullname = fullname.replace(".", "\\")
for s in self._suffixes:
if (fullname + s) in self._files:
return self
return None
def locate_dll_image(self, name):
# A callback function for_memimporter.import_module. Tries to
# locate additional dlls. Returns the image as Python string,
# or None if not found.
if name in self._files:
return self.get_data(name)
return None
def load_module(self, fullname):
if sys.modules.has_key(fullname):
mod = sys.modules[fullname]
if _memimporter.get_verbose_flag():
sys.stderr.write("import %s # previously loaded from zipfile %s\n" % (fullname, self.archive))
return mod
_memimporter.set_find_proc(self.locate_dll_image)
try:
return zipimport.zipimporter.load_module(self, fullname)
except zipimport.ZipImportError:
pass
initname = "init" + fullname.split(".")[-1] # name of initfunction
filename = fullname.replace(".", "\\")
if filename in ("pywintypes", "pythoncom"):
filename = filename + "%d%d" % sys.version_info[:2]
suffixes = ('.dll',)
else:
suffixes = self._suffixes
for s in suffixes:
path = filename + s
if path in self._files:
if _memimporter.get_verbose_flag():
sys.stderr.write("# found %s in zipfile %s\n" % (path, self.archive))
code = self.get_data(path)
mod = _memimporter.import_module(code, initname, fullname, path)
mod.__file__ = "%s\\%s" % (self.archive, path)
mod.__loader__ = self
if _memimporter.get_verbose_flag():
sys.stderr.write("import %s # loaded from zipfile %s\n" % (fullname, mod.__file__))
return mod
raise zipimport.ZipImportError, "can't find module %s" % fullname
def __repr__(self):
return "<%s object %r>" % (self.__class__.__name__, self.archive)
def install():
"Install the zipextimporter"
sys.path_hooks.insert(0, ZipExtensionImporter)
sys.path_importer_cache.clear()
##if __name__ == "__main__":
## import doctest
## doctest.testmod()