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gecko/extensions/python/xpcom/client/__init__.py

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# ***** 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, 2001
# the Initial Developer. All Rights Reserved.
#
# Contributor(s):
# Mark Hammond <MarkH@ActiveState.com> (original author)
#
# 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 os
import new
import logging
from xpcom import xpt, COMException, nsError, logger
# Suck in stuff from _xpcom we use regularly to prevent a module lookup
from xpcom._xpcom import IID_nsISupports, IID_nsIClassInfo, \
IID_nsISupportsCString, IID_nsISupportsString, \
IID_nsISupportsWeakReference, IID_nsIWeakReference, \
XPTI_GetInterfaceInfoManager, GetComponentManager, NS_InvokeByIndex
# Attribute names we may be __getattr__'d for, but know we don't want to delegate
# Could maybe just look for startswith("__") but this may screw things for some objects.
_special_getattr_names = ["__del__", "__len__", "__nonzero__", "__eq__", "__neq__"]
_just_int_interfaces = ["nsISupportsPRInt32", "nsISupportsPRInt16", "nsISupportsPRUint32", "nsISupportsPRUint16", "nsISupportsPRUint8", "nsISupportsPRBool"]
_just_long_interfaces = ["nsISupportsPRInt64", "nsISupportsPRUint64"]
_just_float_interfaces = ["nsISupportsDouble", "nsISupportsFloat"]
# When doing a specific conversion, the order we try the interfaces in.
_int_interfaces = _just_int_interfaces + _just_float_interfaces
_long_interfaces = _just_long_interfaces + _just_int_interfaces + _just_float_interfaces
_float_interfaces = _just_float_interfaces + _just_long_interfaces + _just_int_interfaces
method_template = """
def %s(self, %s):
return NS_InvokeByIndex(self._comobj_, %d, (%s, (%s)))
"""
def _MakeMethodCode(method):
# Build a declaration
param_no = 0
param_decls = []
param_flags = []
param_names = []
used_default = 0
for param in method.params:
param_no = param_no + 1
param_name = "Param%d" % (param_no,)
param_default = ""
if not param.hidden_indicator and param.IsIn() and not param.IsDipper():
if param.IsOut() or used_default: # If the param is "inout", provide a useful default for the "in" direction.
param_default = " = None"
used_default = 1 # Once we have used one once, we must for the rest!
param_decls.append(param_name + param_default)
param_names.append(param_name)
type_repr = xpt.MakeReprForInvoke(param)
param_flags.append( (param.param_flags,) + type_repr )
sep = ", "
param_decls = sep.join(param_decls)
if len(param_names)==1: # Damn tuple reprs.
param_names = param_names[0] + ","
else:
param_names = sep.join(param_names)
# A couple of extra newlines make them easier to read for debugging :-)
return method_template % (method.name, param_decls, method.method_index, tuple(param_flags), param_names)
# Keyed by IID, each item is a tuple of (methods, getters, setters)
interface_cache = {}
# Keyed by [iid][name], each item is an unbound method.
interface_method_cache = {}
# Keyed by clsid from nsIClassInfo - everything ever queried for the CID.
contractid_info_cache = {}
have_shutdown = 0
def _shutdown():
interface_cache.clear()
interface_method_cache.clear()
contractid_info_cache.clear()
global have_shutdown
have_shutdown = 1
# Fully process the named method, generating method code etc.
def BuildMethod(method_info, iid):
name = method_info.name
try:
return interface_method_cache[iid][name]
except KeyError:
pass
# Generate it.
assert not (method_info.IsSetter() or method_info.IsGetter()), "getters and setters should have been weeded out by now"
method_code = _MakeMethodCode(method_info)
# Build the method - We only build a function object here
# - they are bound to each instance as needed.
## print "Method Code for %s (%s):" % (name, iid)
## print method_code
codeObject = compile(method_code, "<XPCOMObject method '%s'>" % (name,), "exec")
# Exec the code object
tempNameSpace = {}
exec codeObject in globals(), tempNameSpace
ret = tempNameSpace[name]
if not interface_method_cache.has_key(iid):
interface_method_cache[iid] = {}
interface_method_cache[iid][name] = ret
return ret
from xpcom.xpcom_consts import XPT_MD_GETTER, XPT_MD_SETTER, XPT_MD_NOTXPCOM, XPT_MD_CTOR, XPT_MD_HIDDEN
FLAGS_TO_IGNORE = XPT_MD_NOTXPCOM | XPT_MD_CTOR | XPT_MD_HIDDEN
# Pre-process the interface - generate a list of methods, constants etc,
# but don't actually generate the method code.
def BuildInterfaceInfo(iid):
assert not have_shutdown, "Can't build interface info after a shutdown"
ret = interface_cache.get(iid, None)
if ret is None:
# Build the data for the cache.
method_code_blocks = []
getters = {}
setters = {}
method_infos = {}
interface = xpt.Interface(iid)
for m in interface.methods:
flags = m.flags
if flags & FLAGS_TO_IGNORE == 0:
if flags & XPT_MD_SETTER:
param_flags = map(lambda x: (x.param_flags,) + xpt.MakeReprForInvoke(x), m.params)
setters[m.name] = m.method_index, param_flags
elif flags & XPT_MD_GETTER:
param_flags = map(lambda x: (x.param_flags,) + xpt.MakeReprForInvoke(x), m.params)
getters[m.name] = m.method_index, param_flags
else:
method_infos[m.name] = m
# Build the constants.
constants = {}
for c in interface.constants:
constants[c.name] = c.value
ret = method_infos, getters, setters, constants
interface_cache[iid] = ret
return ret
class _XPCOMBase:
def __cmp__(self, other):
try:
other = other._comobj_
except AttributeError:
pass
return cmp(self._comobj_, other)
def __hash__(self):
return hash(self._comobj_)
# The basic rich compare ops for equality
def __eq__(self, other):
try:
other = other._comobj_
except AttributeError:
pass
return self._comobj_ == other
def __neq__(self, other):
try:
other = other._comobj_
except AttributeError:
pass
return self._comobj_ != other
# See if the object support strings.
def __str__(self):
try:
self._comobj_.QueryInterface(IID_nsISupportsCString, 0)
return str(self._comobj_)
except COMException:
return self.__repr__()
def __unicode__(self):
try:
prin = self._comobj_.QueryInterface(IID_nsISupportsString)
except COMException:
return unicode(str(self))
return prin.data
# Try the numeric support.
def _do_conversion(self, interface_names, cvt):
iim = XPTI_GetInterfaceInfoManager()
for interface_name in interface_names:
iid = iim.GetInfoForName(interface_name).GetIID()
try:
prim = self._comobj_.QueryInterface(iid)
return cvt(prim.data)
except COMException:
pass
raise ValueError, "This object does not support automatic numeric conversion to this type"
def __int__(self):
return self._do_conversion(_int_interfaces, int)
def __long__(self):
return self._do_conversion(_long_interfaces, long)
def __float__(self):
return self._do_conversion(_float_interfaces, float)
class Component(_XPCOMBase):
def __init__(self, ob, iid = IID_nsISupports):
assert not hasattr(ob, "_comobj_"), "Should be a raw nsIWhatever, not a wrapped one"
ob_name = None
if not hasattr(ob, "IID"):
ob_name = ob
cm = GetComponentManager()
ob = cm.createInstanceByContractID(ob)
assert not hasattr(ob, "_comobj_"), "The created object should be a raw nsIWhatever, not a wrapped one"
# Keep a reference to the object in the component too
self.__dict__['_comobj_'] = ob
# hit __dict__ directly to avoid __setattr__()
self.__dict__['_interfaces_'] = {} # keyed by IID
self.__dict__['_interface_names_'] = {} # keyed by IID name
self.__dict__['_interface_infos_'] = {} # keyed by IID
self.__dict__['_name_to_interface_iid_'] = {}
self.__dict__['_tried_classinfo_'] = 0
if ob_name is None:
ob_name = "<unknown>"
self.__dict__['_object_name_'] = ob_name
self.QueryInterface(iid)
def _build_all_supported_interfaces_(self):
# Use nsIClassInfo, but don't do it at object construction to keep perf up.
# Only pay the penalty when we really need it.
assert not self._tried_classinfo_, "already tried to get the class info."
self.__dict__['_tried_classinfo_'] = 1
# See if nsIClassInfo is supported.
try:
classinfo = self._comobj_.QueryInterface(IID_nsIClassInfo, 0)
except COMException:
classinfo = None
if classinfo is not None:
try:
real_cid = classinfo.contractID
except COMException:
real_cid = None
if real_cid:
self.__dict__['_object_name_'] = real_cid
contractid_info = contractid_info_cache.get(real_cid)
else:
contractid_info = None
if contractid_info is None:
try:
interface_infos = classinfo.getInterfaces()
except COMException:
interface_infos = []
for nominated_iid in interface_infos:
# Interface may appear twice in the class info list, so check this here.
if not self.__dict__['_interface_infos_'].has_key(nominated_iid):
# Just invoke our QI on the object
self.queryInterface(nominated_iid)
if real_cid is not None:
contractid_info = {}
contractid_info['_name_to_interface_iid_'] = self.__dict__['_name_to_interface_iid_']
contractid_info['_interface_infos_'] = self.__dict__['_interface_infos_']
contractid_info_cache[real_cid] = contractid_info
else:
for key, val in contractid_info.items():
self.__dict__[key].update(val)
self.__dict__['_com_classinfo_'] = classinfo
def _remember_interface_info(self, iid):
# XXX - there is no good reason to cache this only in each instance
# It should be cached at the module level, so we don't need to
# rebuild the world for each new object.
iis = self.__dict__['_interface_infos_']
assert not iis.has_key(iid), "Already remembered this interface!"
try:
method_infos, getters, setters, constants = BuildInterfaceInfo(iid)
except COMException, why:
# Failing to build an interface info generally isn't a real
# problem - its probably just that the interface is non-scriptable.
logger.info("Failed to build interface info for %s: %s", iid, why)
# Remember the fact we failed.
iis[iid] = None
return
# Remember all the names so we can delegate
iis[iid] = method_infos, getters, setters, constants
names = self.__dict__['_name_to_interface_iid_']
for name in method_infos.keys(): names[name] = iid
for name in getters.keys(): names[name] = iid
for name in setters.keys(): names[name] = iid
for name in constants.keys(): names[name] = iid
def QueryInterface(self, iid):
if self._interfaces_.has_key(iid):
assert self._interface_names_.has_key(iid.name), "_interfaces_ has the key, but _interface_names_ does not!"
return self
# Haven't seen this before - do a real QI.
if not self._interface_infos_.has_key(iid):
self._remember_interface_info(iid)
iface_info = self._interface_infos_[iid]
if iface_info is None:
# We have tried, but failed, to get this interface info. Its
# unlikely to work later either - its probably non-scriptable.
# That means our component wrappers are useless - so just return a
# raw nsISupports object with no wrapper.
return self._comobj_.QueryInterface(iid, 0)
raw_iface = self._comobj_.QueryInterface(iid, 0)
method_infos, getters, setters, constants = iface_info
new_interface = _Interface(raw_iface, iid, method_infos,
getters, setters, constants)
self._interfaces_[iid] = new_interface
self._interface_names_[iid.name] = new_interface
# As we 'flatten' objects when possible, a QI on an object just
# returns ourself - all the methods etc on this interface are
# available.
return self
queryInterface = QueryInterface # Alternate name.
def __getattr__(self, attr):
if attr in _special_getattr_names:
raise AttributeError, attr
# First allow the interface name to return the "raw" interface
interface = self.__dict__['_interface_names_'].get(attr, None)
if interface is not None:
return interface
# See if we know the IID of an interface providing this attribute
iid = self.__dict__['_name_to_interface_iid_'].get(attr, None)
# This may be first time trying this interface - get the nsIClassInfo
if iid is None and not self._tried_classinfo_:
self._build_all_supported_interfaces_()
iid = self.__dict__['_name_to_interface_iid_'].get(attr, None)
# If the request is for an interface name, it may now be
# available.
interface = self.__dict__['_interface_names_'].get(attr, None)
if interface is not None:
return interface
if iid is not None:
interface = self.__dict__['_interfaces_'].get(iid, None)
if interface is None:
self.QueryInterface(iid)
interface = self.__dict__['_interfaces_'][iid]
return getattr(interface, attr)
# Some interfaces may provide this name via "native" support.
# Loop over all interfaces, and if found, cache it for next time.
for interface in self.__dict__['_interfaces_'].values():
try:
ret = getattr(interface, attr)
self.__dict__['_name_to_interface_iid_'][attr] = interface._iid_
return ret
except AttributeError:
pass
raise AttributeError, "XPCOM component '%s' has no attribute '%s'" % (self._object_name_, attr)
def __setattr__(self, attr, val):
iid = self._name_to_interface_iid_.get(attr, None)
# This may be first time trying this interface - get the nsIClassInfo
if iid is None and not self._tried_classinfo_:
self._build_all_supported_interfaces_()
iid = self.__dict__['_name_to_interface_iid_'].get(attr, None)
if iid is not None:
interface = self._interfaces_.get(iid, None)
if interface is None:
self.QueryInterface(iid)
interface = self.__dict__['_interfaces_'][iid]
setattr(interface, attr, val)
return
raise AttributeError, "XPCOM component '%s' has no attribute '%s'" % (self._object_name_, attr)
def _get_classinfo_repr_(self):
try:
if not self._tried_classinfo_:
self._build_all_supported_interfaces_()
assert self._tried_classinfo_, "Should have tried the class info by now!"
except COMException:
# Error building the info - ignore the error, but ensure that
# we are flagged as *not* having built, so the error is seen
# by the first caller who actually *needs* this to work.
self.__dict__['_tried_classinfo_'] = 0
iface_names = self.__dict__['_interface_names_'].keys()
try:
iface_names.remove("nsISupports")
except ValueError:
pass
iface_names.sort()
iface_desc = "implementing %s" % (",".join(iface_names),)
return iface_desc
def __repr__(self):
# We can advantage from nsIClassInfo - use it.
iface_desc = self._get_classinfo_repr_()
return "<XPCOM component '%s' (%s)>" % (self._object_name_,iface_desc)
class _Interface(_XPCOMBase):
def __init__(self, comobj, iid, method_infos, getters, setters, constants):
self.__dict__['_comobj_'] = comobj
self.__dict__['_iid_'] = iid
self.__dict__['_property_getters_'] = getters
self.__dict__['_property_setters_'] = setters
self.__dict__['_method_infos_'] = method_infos # method infos waiting to be turned into real methods.
self.__dict__['_methods_'] = {} # unbound methods
self.__dict__['_object_name_'] = iid.name
self.__dict__.update(constants)
# We remember the constant names to prevent the user trying to assign to them!
self.__dict__['_constant_names_'] = constants.keys()
def __getattr__(self, attr):
# Allow the underlying interface to provide a better implementation if desired.
if attr in _special_getattr_names:
raise AttributeError, attr
ret = getattr(self.__dict__['_comobj_'], attr, None)
if ret is not None:
return ret
# Do the function thing first.
unbound_method = self.__dict__['_methods_'].get(attr, None)
if unbound_method is not None:
return new.instancemethod(unbound_method, self, self.__class__)
getters = self.__dict__['_property_getters_']
info = getters.get(attr)
if info is not None:
method_index, param_infos = info
if len(param_infos)!=1: # Only expecting a retval
raise RuntimeError, "Can't get properties with this many args!"
args = ( param_infos, () )
return NS_InvokeByIndex(self._comobj_, method_index, args)
# See if we have a method info waiting to be turned into a method.
# Do this last as it is a one-off hit.
method_info = self.__dict__['_method_infos_'].get(attr, None)
if method_info is not None:
unbound_method = BuildMethod(method_info, self._iid_)
# Cache it locally
self.__dict__['_methods_'][attr] = unbound_method
return new.instancemethod(unbound_method, self, self.__class__)
raise AttributeError, "XPCOM component '%s' has no attribute '%s'" % (self._object_name_, attr)
def __setattr__(self, attr, val):
# If we already have a __dict__ item of that name, and its not one of
# our constants, we just directly set it, and leave.
if self.__dict__.has_key(attr) and attr not in self.__dict__['_constant_names_']:
self.__dict__[attr] = val
return
# Start sniffing for what sort of attribute this might be?
setters = self.__dict__['_property_setters_']
info = setters.get(attr)
if info is None:
raise AttributeError, "XPCOM component '%s' can not set attribute '%s'" % (self._object_name_, attr)
method_index, param_infos = info
if len(param_infos)!=1: # Only expecting a single input val
raise RuntimeError, "Can't set properties with this many args!"
real_param_infos = ( param_infos, (val,) )
return NS_InvokeByIndex(self._comobj_, method_index, real_param_infos)
def __repr__(self):
return "<XPCOM interface '%s'>" % (self._object_name_,)
# Called by the _xpcom C++ framework to wrap interfaces up just
# before they are returned.
def MakeInterfaceResult(ob, iid):
return Component(ob, iid)
class WeakReference:
"""A weak-reference object. You construct a weak reference by passing
any COM object you like. If the object does not support weak
refs, you will get a standard NS_NOINTERFACE exception.
Once you have a weak-reference, you can "call" the object to get
back a strong reference. Eg:
>>> some_ob = components.classes['...']
>>> weak_ref = WeakReference(some_ob)
>>> new_ob = weak_ref() # new_ob is effectively "some_ob" at this point
>>> # EXCEPT: new_ob may be None if some_ob has already died - a
>>> # weak reference does not keep the object alive (that is the point)
You should never hold onto this resulting strong object for a long time,
or else you defeat the purpose of the weak-reference.
"""
def __init__(self, ob, iid = None):
swr = Component(ob._comobj_, IID_nsISupportsWeakReference)
self._comobj_ = Component(swr.GetWeakReference()._comobj_, IID_nsIWeakReference)
if iid is None:
try:
iid = ob.IID
except AttributeError:
iid = IID_nsISupports
self._iid_ = iid
def __call__(self, iid = None):
if iid is None: iid = self._iid_
try:
return Component(self._comobj_.QueryReferent(iid)._comobj_, iid)
except COMException, details:
if details.errno != nsError.NS_ERROR_NULL_POINTER:
raise
return None
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