Current File : //proc/3/cwd/lib/virtualbox/sdk/bindings/xpcom/python/xpcom/server/loader.py
# ***** BEGIN LICENSE BLOCK *****
# Version: MPL 1.1/GPL 2.0/LGPL 2.1
#
# The contents of this file are subject to the Mozilla Public License Version
# 1.1 (the "License"); you may not use this file except in compliance with
# the License. You may obtain a copy of the License at
# http://www.mozilla.org/MPL/
#
# Software distributed under the License is distributed on an "AS IS" basis,
# WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
# for the specific language governing rights and limitations under the
# License.
#
# The Original Code is the Python XPCOM language bindings.
#
# The Initial Developer of the Original Code is
# Activestate Tool Corp.
# Portions created by the Initial Developer are Copyright (C) 2000
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
# Mark Hammond <MarkH@ActiveState.com>
#
# Alternatively, the contents of this file may be used under the terms of
# either the GNU General Public License Version 2 or later (the "GPL"), or
# the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
# in which case the provisions of the GPL or the LGPL are applicable instead
# of those above. If you wish to allow use of your version of this file only
# under the terms of either the GPL or the LGPL, and not to allow others to
# use your version of this file under the terms of the MPL, indicate your
# decision by deleting the provisions above and replace them with the notice
# and other provisions required by the GPL or the LGPL. If you do not delete
# the provisions above, a recipient may use your version of this file under
# the terms of any one of the MPL, the GPL or the LGPL.
#
# ***** END LICENSE BLOCK *****
import xpcom
from xpcom import components, logger
from . import module
import glob
import os
from xpcom.client import Component
# Until we get interface constants.
When_Startup = 0
When_Component = 1
When_Timer = 2
def _has_good_attr(object, attr):
# Actually allows "None" to be specified to disable inherited attributes.
return getattr(object, attr, None) is not None
def FindCOMComponents(py_module):
# For now, just run over all classes looking for likely candidates.
comps = []
for name, object in list(py_module.__dict__.items()):
try:
if (type(object) == type or issubclass(object, object)) and \
_has_good_attr(object, "_com_interfaces_") and \
_has_good_attr(object, "_reg_clsid_") and \
_has_good_attr(object, "_reg_contractid_"):
comps.append(object)
except TypeError:
# The issubclass call raises TypeError when the obj is not a class.
pass;
return comps
def register_self(klass, compMgr, location, registryLocation, componentType):
pcl = PythonComponentLoader
from xpcom import _xpcom
svc = _xpcom.GetServiceManager().getServiceByContractID("@mozilla.org/categorymanager;1", components.interfaces.nsICategoryManager)
svc.addCategoryEntry("component-loader", pcl._reg_component_type_, pcl._reg_contractid_, 1, 1)
class PythonComponentLoader:
_com_interfaces_ = components.interfaces.nsIComponentLoader
_reg_clsid_ = "{63B68B1E-3E62-45f0-98E3-5E0B5797970C}" # Never copy these!
_reg_contractid_ = "moz.pyloader.1"
_reg_desc_ = "Python component loader"
# Optional function which performs additional special registration
# Appears that no special unregistration is needed for ComponentLoaders, hence no unregister function.
_reg_registrar_ = (register_self,None)
# Custom attributes for ComponentLoader registration.
_reg_component_type_ = "script/python"
def __init__(self):
self.com_modules = {} # Keyed by module's FQN as obtained from nsIFile.path
self.moduleFactory = module.Module
self.num_modules_this_register = 0
def _getCOMModuleForLocation(self, componentFile):
fqn = componentFile.path
mod = self.com_modules.get(fqn)
if mod is not None:
return mod
import ihooks, sys
base_name = os.path.splitext(os.path.basename(fqn))[0]
loader = ihooks.ModuleLoader()
module_name_in_sys = "component:%s" % (base_name,)
stuff = loader.find_module(base_name, [componentFile.parent.path])
assert stuff is not None, "Couldnt find the module '%s'" % (base_name,)
py_mod = loader.load_module( module_name_in_sys, stuff )
# Make and remember the COM module.
comps = FindCOMComponents(py_mod)
mod = self.moduleFactory(comps)
self.com_modules[fqn] = mod
return mod
def getFactory(self, clsid, location, type):
# return the factory
assert type == self._reg_component_type_, "Being asked to create an object not of my type:%s" % (type,)
# FIXME: how to do this without obsolete component manager?
cmo = components.manager.queryInterface(components.interfaces.nsIComponentManagerObsolete)
file_interface = cmo.specForRegistryLocation(location)
# delegate to the module.
m = self._getCOMModuleForLocation(file_interface)
return m.getClassObject(components.manager, clsid, components.interfaces.nsIFactory)
def init(self, comp_mgr, registry):
# void
self.comp_mgr = comp_mgr
logger.debug("Python component loader init() called")
# Called when a component of the appropriate type is registered,
# to give the component loader an opportunity to do things like
# annotate the registry and such.
def onRegister (self, clsid, type, className, proId, location, replace, persist):
logger.debug("Python component loader - onRegister() called")
def autoRegisterComponents (self, when, directory):
directory_path = directory.path
self.num_modules_this_register = 0
logger.debug("Auto-registering all Python components in '%s'", directory_path)
# ToDo - work out the right thing here
# eg - do we recurse?
# - do we support packages?
entries = directory.directoryEntries
while entries.HasMoreElements():
entry = entries.GetNext(components.interfaces.nsIFile)
if os.path.splitext(entry.path)[1]==".py":
try:
self.autoRegisterComponent(when, entry)
# Handle some common user errors
except xpcom.COMException as details:
from xpcom import nsError
# If the interface name does not exist, suppress the traceback
if details.errno==nsError.NS_ERROR_NO_INTERFACE:
logger.error("Registration of '%s' failed\n %s",
entry.leafName, details.message)
else:
logger.exception("Registration of '%s' failed!", entry.leafName)
except SyntaxError as details:
# Syntax error in source file - no useful traceback here either.
logger.error("Registration of '%s' failed\n %s",
entry.leafName, details)
except:
# All other exceptions get the full traceback.
logger.exception("Registration of '%s' failed.", entry.leafName)
def autoRegisterComponent (self, when, componentFile):
# bool return
# Check if we actually need to do anything
modtime = componentFile.lastModifiedTime
loader_mgr = components.manager.queryInterface(components.interfaces.nsIComponentLoaderManager)
if not loader_mgr.hasFileChanged(componentFile, None, modtime):
return 1
if self.num_modules_this_register == 0:
# New components may have just installed new Python
# modules into the main python directory (including new .pth files)
# So we ask Python to re-process our site directory.
# Note that the pyloader does the equivalent when loading.
try:
from xpcom import _xpcom
import site
NS_XPCOM_CURRENT_PROCESS_DIR="XCurProcD"
dirname = _xpcom.GetSpecialDirectory(NS_XPCOM_CURRENT_PROCESS_DIR)
dirname.append("python")
site.addsitedir(dirname.path)
except:
logger.exception("PyXPCOM loader failed to process site directory before component registration")
self.num_modules_this_register += 1
# auto-register via the module.
m = self._getCOMModuleForLocation(componentFile)
m.registerSelf(components.manager, componentFile, None, self._reg_component_type_)
loader_mgr = components.manager.queryInterface(components.interfaces.nsIComponentLoaderManager)
loader_mgr.saveFileInfo(componentFile, None, modtime)
return 1
def autoUnregisterComponent (self, when, componentFile):
# bool return
# auto-unregister via the module.
m = self._getCOMModuleForLocation(componentFile)
loader_mgr = components.manager.queryInterface(components.interfaces.nsIComponentLoaderManager)
try:
m.unregisterSelf(components.manager, componentFile)
finally:
loader_mgr.removeFileInfo(componentFile, None)
return 1
def registerDeferredComponents (self, when):
# bool return
logger.debug("Python component loader - registerDeferred() called")
return 0 # no more to register
def unloadAll (self, when):
# This is called at shutdown time - don't get too upset if an error
# results from logging due to the logfile being closed
try:
logger.debug("Python component loader being asked to unload all components!")
except:
# Evil blank except, but restricting to just catching IOError
# failure means custom logs could still screw us
pass
self.comp_mgr = None
self.com_modules = {}
def MakePythonComponentLoaderModule(serviceManager, nsIFile):
from . import module
return module.Module( [PythonComponentLoader] )
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