erebion/libervia-backend
Watch
1
0
Fork
You've already forked libervia-backend
 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

refactoring: rename sat_frontends to libervia.frontends

Browse source
This commit is contained in:
Goffi 2023-06-02 14:12:38 +02:00
commit 4ab9bd7bc8
1 changed files with 162 additions and 162 deletions
Download patch file Download diff file Expand all files Collapse all files

478
sat_frontends/quick_frontend/quick_widgets.py
View file

@ -1,478 +0,0 @@
#!/usr/bin/env python3
# helper class for making a SAT frontend
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Affero General Public License for more details.
# You should have received a copy of the GNU Affero General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from libervia.backend.core.log import getLogger
log = getLogger(__name__)
from libervia.backend.core import exceptions
from sat_frontends.quick_frontend.constants import Const as C
classes_map = {}
try:
# FIXME: to be removed when an acceptable solution is here
str("") # XXX: unicode doesn't exist in pyjamas
except (
TypeError,
AttributeError,
): # Error raised is not the same depending on pyjsbuild options
str = str
def register(base_cls, child_cls=None):
"""Register a child class to use by default when a base class is needed
@param base_cls: "Quick..." base class (like QuickChat or QuickContact), must inherit from QuickWidget
@param child_cls: inherited class to use when Quick... class is requested, must inherit from base_cls.
Can be None if it's the base_cls itself which register
"""
# FIXME: we use base_cls.__name__ instead of base_cls directly because pyjamas because
# in the second case
classes_map[base_cls.__name__] = child_cls
class WidgetAlreadyExistsError(Exception):
pass
class QuickWidgetsManager(object):
"""This class is used to manage all the widgets of a frontend
A widget can be a window, a graphical thing, or someting else depending of the frontend"""
def __init__(self, host):
self.host = host
self._widgets = {}
def __iter__(self):
"""Iterate throught all widgets"""
for widget_map in self._widgets.values():
for widget_instances in widget_map.values():
for widget in widget_instances:
yield widget
def get_real_class(self, class_):
"""Return class registered for given class_
@param class_: subclass of QuickWidget
@return: class actually used to create widget
"""
try:
# FIXME: we use base_cls.__name__ instead of base_cls directly because pyjamas bugs
# in the second case
cls = classes_map[class_.__name__]
except KeyError:
cls = class_
if cls is None:
raise exceptions.InternalError(
"There is not class registered for {}".format(class_)
)
return cls
def get_widget_instances(self, widget):
"""Get all instance of a widget
This is a helper method which call get_widgets
@param widget(QuickWidget): retrieve instances of this widget
@return: iterator on widgets
"""
return self.get_widgets(widget.__class__, widget.target, widget.profiles)
def get_widgets(self, class_, target=None, profiles=None, with_duplicates=True):
"""Get all subclassed widgets instances
@param class_: subclass of QuickWidget, same parameter as used in
[get_or_create_widget]
@param target: if not None, construct a hash with this target and filter
corresponding widgets
recreated widgets are handled
@param profiles(iterable, None): if not None, filter on instances linked to these
profiles
@param with_duplicates(bool): if False, only first widget with a given hash is
returned
@return: iterator on widgets
"""
class_ = self.get_real_class(class_)
try:
widgets_map = self._widgets[class_.__name__]
except KeyError:
return
else:
if target is not None:
filter_hash = str(class_.get_widget_hash(target, profiles))
else:
filter_hash = None
if filter_hash is not None:
for widget in widgets_map.get(filter_hash, []):
yield widget
if not with_duplicates:
return
else:
for widget_instances in widgets_map.values():
for widget in widget_instances:
yield widget
if not with_duplicates:
# widgets are set by hashes, so if don't want duplicates
# we only return the first widget of the list
break
def get_widget(self, class_, target=None, profiles=None):
"""Get a widget without creating it if it doesn't exist.
if several instances of widgets with this hash exist, the first one is returned
@param class_: subclass of QuickWidget, same parameter as used in [get_or_create_widget]
@param target: target depending of the widget, usually a JID instance
@param profiles (unicode, iterable[unicode], None): profile(s) to use (may or may not be
used, depending of the widget class)
@return: a class_ instance or None if the widget doesn't exist
"""
assert (target is not None) or (profiles is not None)
if profiles is not None and isinstance(profiles, str):
profiles = [profiles]
class_ = self.get_real_class(class_)
hash_ = class_.get_widget_hash(target, profiles)
try:
return self._widgets[class_.__name__][hash_][0]
except KeyError:
return None
def get_or_create_widget(self, class_, target, *args, **kwargs):
"""Get an existing widget or create a new one when necessary
If the widget is new, self.host.new_widget will be called with it.
@param class_(class): class of the widget to create
@param target: target depending of the widget, usually a JID instance
@param args(list): optional args to create a new instance of class_
@param kwargs(dict): optional kwargs to create a new instance of class_
if 'profile' key is present, it will be popped and put in 'profiles'
if there is neither 'profile' nor 'profiles', None will be used for 'profiles'
if 'on_new_widget' is present it can have the following values:
C.WIDGET_NEW [default]: self.host.new_widget will be called on widget creation
[callable]: this method will be called instead of self.host.new_widget
None: do nothing
if 'on_existing_widget' is present it can have the following values:
C.WIDGET_KEEP [default]: return the existing widget
C.WIDGET_RAISE: raise WidgetAlreadyExistsError
C.WIDGET_RECREATE: create a new widget
if the existing widget has a "recreate_args" method, it will be called with args list and kwargs dict
so the values can be completed to create correctly the new instance
[callable]: this method will be called with existing widget as argument, the widget to use must be returned
if 'force_hash' is present, the hash given in value will be used instead of the one returned by class_.get_widget_hash
other keys will be used to instanciate class_ if the case happen (e.g. if type_ is present and class_ is a QuickChat subclass,
it will be used to create a new QuickChat instance).
@return: a class_ instance, either new or already existing
"""
cls = self.get_real_class(class_)
## arguments management ##
_args = [self.host, target] + list(
args
) or [] # FIXME: check if it's really necessary to use optional args
_kwargs = kwargs or {}
if "profiles" in _kwargs and "profile" in _kwargs:
raise ValueError(
"You can't have 'profile' and 'profiles' keys at the same time"
)
try:
_kwargs["profiles"] = [_kwargs.pop("profile")]
except KeyError:
if not "profiles" in _kwargs:
_kwargs["profiles"] = None
# on_new_widget tells what to do for the new widget creation
try:
on_new_widget = _kwargs.pop("on_new_widget")
except KeyError:
on_new_widget = C.WIDGET_NEW
# on_existing_widget tells what to do when the widget already exists
try:
on_existing_widget = _kwargs.pop("on_existing_widget")
except KeyError:
on_existing_widget = C.WIDGET_KEEP
## we get the hash ##
try:
hash_ = _kwargs.pop("force_hash")
except KeyError:
hash_ = cls.get_widget_hash(target, _kwargs["profiles"])
## widget creation or retrieval ##
widgets_map = self._widgets.setdefault(
cls.__name__, {}
) # we sorts widgets by classes
if not cls.SINGLE:
widget = None # if the class is not SINGLE, we always create a new widget
else:
try:
widget = widgets_map[hash_][0]
except KeyError:
widget = None
else:
widget.add_target(target)
if widget is None:
# we need to create a new widget
log.debug(f"Creating new widget for target {target} {cls}")
widget = cls(*_args, **_kwargs)
widgets_map.setdefault(hash_, []).append(widget)
self.host.call_listeners("widgetNew", widget)
if on_new_widget == C.WIDGET_NEW:
self.host.new_widget(widget)
elif callable(on_new_widget):
on_new_widget(widget)
else:
assert on_new_widget is None
else:
# the widget already exists
if on_existing_widget == C.WIDGET_KEEP:
pass
elif on_existing_widget == C.WIDGET_RAISE:
raise WidgetAlreadyExistsError(hash_)
elif on_existing_widget == C.WIDGET_RECREATE:
try:
recreate_args = widget.recreate_args
except AttributeError:
pass
else:
recreate_args(_args, _kwargs)
widget = cls(*_args, **_kwargs)
widgets_map[hash_].append(widget)
log.debug("widget <{wid}> already exists, a new one has been recreated"
.format(wid=widget))
elif callable(on_existing_widget):
widget = on_existing_widget(widget)
if widget is None:
raise exceptions.InternalError(
"on_existing_widget method must return the widget to use")
if widget not in widgets_map[hash_]:
log.debug(
"the widget returned by on_existing_widget is new, adding it")
widgets_map[hash_].append(widget)
else:
raise exceptions.InternalError(
"Unexpected on_existing_widget value ({})".format(on_existing_widget))
return widget
def delete_widget(self, widget_to_delete, *args, **kwargs):
"""Delete a widget instance
this method must be called by frontends when a widget is deleted
widget's on_delete method will be called before deletion, and deletion will be
stopped if it returns False.
@param widget_to_delete(QuickWidget): widget which need to deleted
@param *args: extra arguments to pass to on_delete
@param *kwargs: extra keywords arguments to pass to on_delete
the extra arguments are not used by QuickFrontend, it's is up to
the frontend to use them or not.
following extra arguments are well known:
- "all_instances" can be used as kwarg, if it evaluate to True,
all instances of the widget will be deleted (if on_delete is
not returning False for any of the instance). This arguments
is not sent to on_delete methods.
- "explicit_close" is used when the deletion is requested by
the user or a leave signal, "all_instances" is usually set at
the same time.
"""
# TODO: all_instances must be independante kwargs, this is not possible with Python 2
# but will be with Python 3
all_instances = kwargs.get('all_instances', False)
if all_instances:
for w in self.get_widget_instances(widget_to_delete):
if w.on_delete(**kwargs) == False:
log.debug(
f"Deletion of {widget_to_delete} cancelled by widget itself")
return
else:
if widget_to_delete.on_delete(**kwargs) == False:
log.debug(f"Deletion of {widget_to_delete} cancelled by widget itself")
return
if self.host.selected_widget == widget_to_delete:
self.host.selected_widget = None
class_ = self.get_real_class(widget_to_delete.__class__)
try:
widgets_map = self._widgets[class_.__name__]
except KeyError:
log.error("no widgets_map found for class {cls}".format(cls=class_))
return
widget_hash = str(class_.get_widget_hash(widget_to_delete.target,
widget_to_delete.profiles))
try:
widget_instances = widgets_map[widget_hash]
except KeyError:
log.error(f"no instance of {class_.__name__} found with hash {widget_hash!r}")
return
if all_instances:
widget_instances.clear()
else:
try:
widget_instances.remove(widget_to_delete)
except ValueError:
log.error("widget_to_delete not found in widget instances")
return
log.debug("widget {} deleted".format(widget_to_delete))
if not widget_instances:
# all instances with this hash have been deleted
# we remove the hash itself
del widgets_map[widget_hash]
log.debug("All instances of {cls} with hash {widget_hash!r} have been deleted"
.format(cls=class_, widget_hash=widget_hash))
self.host.call_listeners("widgetDeleted", widget_to_delete)
class QuickWidget(object):
"""generic widget base"""
# FIXME: sometime a single target is used, sometimes several ones
# This should be sorted out in the same way as for profiles: a single
# target should be possible when appropriate attribute is set.
# methods using target(s) and hash should be fixed accordingly
SINGLE = True # if True, there can be only one widget per target(s)
PROFILES_MULTIPLE = False # If True, this widget can handle several profiles at once
PROFILES_ALLOW_NONE = False # If True, this widget can be used without profile
def __init__(self, host, target, profiles=None):
"""
@param host: %(doc_host)s
@param target: target specific for this widget class
@param profiles: can be either:
- (unicode): used when widget class manage a unique profile
- (iterable): some widget class can manage several profiles, several at once can be specified here
- None: no profile is managed by this widget class (rare)
@raise: ValueError when (iterable) or None is given to profiles for a widget class which manage one unique profile.
"""
self.host = host
self.targets = set()
self.add_target(target)
self.profiles = set()
self._sync = True
if isinstance(profiles, str):
self.add_profile(profiles)
elif profiles is None:
if not self.PROFILES_ALLOW_NONE:
raise ValueError("profiles can't have a value of None")
else:
for profile in profiles:
self.add_profile(profile)
if not self.profiles:
raise ValueError("no profile found, use None for no profile classes")
@property
def profile(self):
assert (
len(self.profiles) == 1
and not self.PROFILES_MULTIPLE
and not self.PROFILES_ALLOW_NONE
)
return list(self.profiles)[0]
@property
def target(self):
"""Return main target
A random target is returned when several targets are available
"""
return next(iter(self.targets))
@property
def widget_hash(self):
"""Return quick widget hash"""
return self.get_widget_hash(self.target, self.profiles)
# synchronisation state
@property
def sync(self):
return self._sync
@sync.setter
def sync(self, state):
"""state of synchronisation with backend
@param state(bool): True when backend is synchronised
False is set by core
True must be set by the widget when resynchronisation is finished
"""
self._sync = state
def resync(self):
"""Method called when backend can be resynchronized
The widget has to set self.sync itself when the synchronisation is finished
"""
pass
# target/profile
def add_target(self, target):
"""Add a target if it doesn't already exists
@param target: target to add
"""
self.targets.add(target)
def add_profile(self, profile):
"""Add a profile is if doesn't already exists
@param profile: profile to add
"""
if self.profiles and not self.PROFILES_MULTIPLE:
raise ValueError("multiple profiles are not allowed")
self.profiles.add(profile)
# widget identitication
@staticmethod
def get_widget_hash(target, profiles):
"""Return the hash associated with this target for this widget class
some widget classes can manage several target on the same instance
(e.g.: a chat widget with multiple resources on the same bare jid),
this method allow to return a hash associated to one or several targets
to retrieve the good instance. For example, a widget managing JID targets,
and all resource of the same bare jid would return the bare jid as hash.
@param target: target to check
@param profiles: profile(s) associated to target, see __init__ docstring
@return: a hash (can correspond to one or many targets or profiles, depending of widget class)
"""
return str(target) # by defaut, there is one hash for one target
# widget life events
def on_delete(self, *args, **kwargs):
"""Called when a widget is being deleted
@return (boot, None): False to cancel deletion
all other value continue deletion
"""
return True
def on_selected(self):
"""Called when host.selected_widget is this instance"""
pass