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"""Functions for loading dynamic libraries.
These extend and correct ctypes functions.
"""
import os
import re
import sys
import ctypes
import ctypes.util
import pyglet
_debug_lib = pyglet.options['debug_lib']
_debug_trace = pyglet.options['debug_trace']
_is_pyglet_doc_run = getattr(sys, "is_pyglet_doc_run", False)
if pyglet.options['search_local_libs']:
script_path = pyglet.resource.get_script_home()
cwd = os.getcwd()
_local_lib_paths = [script_path, os.path.join(script_path, 'lib'), os.path.join(cwd, 'lib')]
if pyglet.compat_platform == 'win32':
os.environ["PATH"] += os.pathsep + os.pathsep.join(_local_lib_paths)
else:
_local_lib_paths = None
class _TraceFunction:
def __init__(self, func):
self.__dict__['_func'] = func
def __str__(self):
return self._func.__name__
def __call__(self, *args, **kwargs):
return self._func(*args, **kwargs)
def __getattr__(self, name):
return getattr(self._func, name)
def __setattr__(self, name, value):
setattr(self._func, name, value)
class _TraceLibrary:
def __init__(self, library):
self._library = library
print(library)
def __getattr__(self, name):
func = getattr(self._library, name)
f = _TraceFunction(func)
return f
if _is_pyglet_doc_run:
class LibraryMock:
"""Mock library used when generating documentation."""
def __getattr__(self, name):
return LibraryMock()
def __setattr__(self, name, value):
pass
def __call__(self, *args, **kwargs):
return LibraryMock()
def __rshift__(self, other):
return 0
class LibraryLoader:
platform = pyglet.compat_platform
# this is only for library loading, don't include it in pyglet.platform
if platform == 'cygwin':
platform = 'win32'
def load_library(self, *names, **kwargs):
"""Find and load a library.
More than one name can be specified, they will be tried in order.
Platform-specific library names (given as kwargs) are tried first.
Raises ImportError if library is not found.
"""
if _is_pyglet_doc_run:
return LibraryMock()
if 'framework' in kwargs and self.platform == 'darwin':
return self.load_framework(kwargs['framework'])
if not names:
raise ImportError("No library name specified")
platform_names = kwargs.get(self.platform, [])
if isinstance(platform_names, str):
platform_names = [platform_names]
elif type(platform_names) is tuple:
platform_names = list(platform_names)
if self.platform.startswith('linux'):
for name in names:
libname = self.find_library(name)
platform_names.append(libname or f'lib{name}.so')
platform_names.extend(names)
for name in platform_names:
try:
lib = ctypes.cdll.LoadLibrary(name)
if _debug_lib:
print(name, self.find_library(name))
if _debug_trace:
lib = _TraceLibrary(lib)
return lib
except OSError as o:
path = self.find_library(name)
if path:
try:
lib = ctypes.cdll.LoadLibrary(path)
if _debug_lib:
print(path)
if _debug_trace:
lib = _TraceLibrary(lib)
return lib
except OSError:
pass
elif self.platform == "win32" and o.winerror != 126:
if _debug_lib:
print(f"Unexpected error loading library {name}: {str(o)}")
raise ImportError(f'Library "{names[0]}" not found.')
def find_library(self, name):
return ctypes.util.find_library(name)
@staticmethod
def load_framework(name):
raise RuntimeError("Can't load framework on this platform.")
class MachOLibraryLoader(LibraryLoader):
def __init__(self):
if 'LD_LIBRARY_PATH' in os.environ:
self.ld_library_path = os.environ['LD_LIBRARY_PATH'].split(':')
else:
self.ld_library_path = []
if _local_lib_paths:
# search first for local libs
self.ld_library_path = _local_lib_paths + self.ld_library_path
os.environ['LD_LIBRARY_PATH'] = ':'.join(self.ld_library_path)
if 'DYLD_LIBRARY_PATH' in os.environ:
self.dyld_library_path = os.environ['DYLD_LIBRARY_PATH'].split(':')
else:
self.dyld_library_path = []
if 'DYLD_FALLBACK_LIBRARY_PATH' in os.environ:
self.dyld_fallback_library_path = os.environ['DYLD_FALLBACK_LIBRARY_PATH'].split(':')
else:
self.dyld_fallback_library_path = [os.path.expanduser('~/lib'), '/usr/local/lib', '/usr/lib']
def find_library(self, path):
"""Implements the dylib search as specified in Apple documentation:
http://developer.apple.com/library/content/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/DynamicLibraryUsageGuidelines.html
Before commencing the standard search, the method first checks
the bundle's ``Frameworks`` directory if the application is running
within a bundle (OS X .app).
"""
libname = os.path.basename(path)
search_path = []
if '.dylib' not in libname:
libname = 'lib' + libname + '.dylib'
# py2app support
if getattr(sys, 'frozen', None) == 'macosx_app' and 'RESOURCEPATH' in os.environ:
search_path.append(os.path.join(os.environ['RESOURCEPATH'],
'..',
'Frameworks',
libname))
# conda support
if os.environ.get('CONDA_PREFIX', False):
search_path.append(os.path.join(os.environ['CONDA_PREFIX'], 'lib', libname))
# pyinstaller.py sets sys.frozen to True, and puts dylibs in
# Contents/macOS, which path pyinstaller puts in sys._MEIPASS
if getattr(sys, 'frozen', False) and getattr(sys, '_MEIPASS', None):
meipass = getattr(sys, '_MEIPASS')
search_path.append(os.path.join(meipass, libname))
# conda support
if os.environ.get('CONDA_PREFIX', False):
search_path.append(os.path.join(os.environ['CONDA_PREFIX'], 'lib', libname))
if '/' in path:
search_path.extend([os.path.join(p, libname) for p in self.dyld_library_path])
search_path.append(path)
search_path.extend([os.path.join(p, libname) for p in self.dyld_fallback_library_path])
else:
search_path.extend([os.path.join(p, libname) for p in self.ld_library_path])
search_path.extend([os.path.join(p, libname) for p in self.dyld_library_path])
search_path.append(path)
search_path.extend([os.path.join(p, libname) for p in self.dyld_fallback_library_path])
for path in search_path:
if os.path.exists(path):
return path
return None
@staticmethod
def load_framework(name):
path = ctypes.util.find_library(name)
# Hack for compatibility with macOS > 11.0
if path is None:
frameworks = {
'AGL': '/System/Library/Frameworks/AGL.framework/AGL',
'IOKit': '/System/Library/Frameworks/IOKit.framework/IOKit',
'OpenAL': '/System/Library/Frameworks/OpenAL.framework/OpenAL',
'OpenGL': '/System/Library/Frameworks/OpenGL.framework/OpenGL'
}
path = frameworks.get(name)
if path:
lib = ctypes.cdll.LoadLibrary(path)
if _debug_lib:
print(path)
if _debug_trace:
lib = _TraceLibrary(lib)
return lib
raise ImportError(f"Can't find framework {name}.")
class LinuxLibraryLoader(LibraryLoader):
_ld_so_cache = None
_local_libs_cache = None
@staticmethod
def _find_libs(directories):
cache = {}
lib_re = re.compile(r'lib(.*)\.so(?:$|\.)')
for directory in directories:
try:
for file in os.listdir(directory):
match = lib_re.match(file)
if match:
# Index by filename
path = os.path.join(directory, file)
if file not in cache:
cache[file] = path
# Index by library name
library = match.group(1)
if library not in cache:
cache[library] = path
except OSError:
pass
return cache
def _create_ld_so_cache(self):
# Recreate search path followed by ld.so. This is going to be
# slow to build, and incorrect (ld.so uses ld.so.cache, which may
# not be up-to-date). Used only as fallback for distros without
# /sbin/ldconfig.
#
# We assume the DT_RPATH and DT_RUNPATH binary sections are omitted.
directories = []
try:
directories.extend(os.environ['LD_LIBRARY_PATH'].split(':'))
except KeyError:
pass
try:
with open('/etc/ld.so.conf') as fid:
directories.extend([directory.strip() for directory in fid])
except IOError:
pass
directories.extend(['/lib', '/usr/lib'])
self._ld_so_cache = self._find_libs(directories)
def find_library(self, path):
# search first for local libs
if _local_lib_paths:
if not self._local_libs_cache:
self._local_libs_cache = self._find_libs(_local_lib_paths)
if path in self._local_libs_cache:
return self._local_libs_cache[path]
# ctypes tries ldconfig, gcc and objdump. If none of these are
# present, we implement the ld-linux.so search path as described in
# the man page.
result = ctypes.util.find_library(path)
if result:
return result
if self._ld_so_cache is None:
self._create_ld_so_cache()
return self._ld_so_cache.get(path)
if pyglet.compat_platform == 'darwin':
loader = MachOLibraryLoader()
elif pyglet.compat_platform.startswith('linux'):
loader = LinuxLibraryLoader()
else:
loader = LibraryLoader()
load_library = loader.load_library
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