206 lines
7.7 KiB
Python
206 lines
7.7 KiB
Python
# vim: ft=python fileencoding=utf-8 sts=4 sw=4 et:
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# Copyright 2015-2017 Florian Bruhin (The Compiler) <mail@qutebrowser.org>
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#
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# This file is part of qutebrowser.
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#
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# qutebrowser is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# qutebrowser is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with qutebrowser. If not, see <http://www.gnu.org/licenses/>.
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"""Saving things to disk periodically."""
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import os.path
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import collections
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from PyQt5.QtCore import pyqtSlot, QObject, QTimer
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from qutebrowser.config import config
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from qutebrowser.commands import cmdutils
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from qutebrowser.utils import utils, log, message, usertypes
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class Saveable:
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"""A single thing which can be saved.
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Attributes:
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_name: The name of the thing to be saved.
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_dirty: Whether the saveable was changed since the last save.
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_save_handler: The function to call to save this Saveable.
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_save_on_exit: Whether to always save this saveable on exit.
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_config_opt: A config option which decides whether to auto-save or not.
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None if no such option exists.
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_filename: The filename of the underlying file.
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"""
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def __init__(self, name, save_handler, changed=None, config_opt=None,
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filename=None):
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self._name = name
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self._dirty = False
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self._save_handler = save_handler
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self._config_opt = config_opt
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if changed is not None:
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changed.connect(self.mark_dirty)
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self._save_on_exit = False
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else:
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self._save_on_exit = True
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self._filename = filename
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if filename is not None and not os.path.exists(filename):
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self._dirty = True
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self.save()
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def __repr__(self):
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return utils.get_repr(self, name=self._name, dirty=self._dirty,
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save_handler=self._save_handler,
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config_opt=self._config_opt,
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save_on_exit=self._save_on_exit,
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filename=self._filename)
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def mark_dirty(self):
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"""Mark this saveable as dirty (having changes)."""
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log.save.debug("Marking {} as dirty.".format(self._name))
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self._dirty = True
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def save(self, is_exit=False, explicit=False, silent=False, force=False):
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"""Save this saveable.
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Args:
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is_exit: Whether we're currently exiting qutebrowser.
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explicit: Whether the user explicitly requested this save.
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silent: Don't write informations to log.
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force: Force saving, no matter what.
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"""
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if (self._config_opt is not None and
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(not config.instance.get(self._config_opt)) and
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(not explicit) and (not force)):
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if not silent:
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log.save.debug("Not saving {name} because autosaving has been "
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"disabled by {cfg[0]} -> {cfg[1]}.".format(
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name=self._name, cfg=self._config_opt))
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return
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do_save = self._dirty or (self._save_on_exit and is_exit) or force
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if not silent:
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log.save.debug("Save of {} requested - dirty {}, save_on_exit {}, "
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"is_exit {}, force {} -> {}".format(
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self._name, self._dirty, self._save_on_exit,
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is_exit, force, do_save))
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if do_save:
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self._save_handler()
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self._dirty = False
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class SaveManager(QObject):
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"""Responsible to save 'saveables' periodically and on exit.
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Attributes:
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saveables: A dict mapping names to Saveable instances.
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_save_timer: The Timer used to periodically auto-save things.
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"""
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def __init__(self, parent=None):
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super().__init__(parent)
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self.saveables = collections.OrderedDict()
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self._save_timer = usertypes.Timer(self, name='save-timer')
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self._save_timer.timeout.connect(self.autosave)
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def __repr__(self):
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return utils.get_repr(self, saveables=self.saveables)
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def init_autosave(self):
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"""Initialize auto-saving.
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We don't do this in __init__ because the config needs to be initialized
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first, but the config needs the save manager.
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"""
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self._set_autosave_interval()
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config.instance.changed.connect(self._set_autosave_interval)
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@config.change_filter('auto_save.interval')
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def _set_autosave_interval(self):
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"""Set the auto-save interval."""
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interval = config.val.auto_save.interval
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if interval == 0:
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self._save_timer.stop()
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else:
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self._save_timer.setInterval(interval)
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self._save_timer.start()
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def add_saveable(self, name, save, changed=None, config_opt=None,
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filename=None, dirty=False):
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"""Add a new saveable.
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Args:
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name: The name to use.
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save: The function to call to save this saveable.
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changed: The signal emitted when this saveable changed.
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config_opt: An option deciding whether to auto-save or not.
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filename: The filename of the underlying file, so we can force
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saving if it doesn't exist.
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dirty: Whether the saveable is already dirty.
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"""
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if name in self.saveables:
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raise ValueError("Saveable {} already registered!".format(name))
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saveable = Saveable(name, save, changed, config_opt, filename)
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self.saveables[name] = saveable
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if dirty:
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saveable.mark_dirty()
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QTimer.singleShot(0, saveable.save)
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def save(self, name, is_exit=False, explicit=False, silent=False,
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force=False):
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"""Save a saveable by name.
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Args:
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is_exit: Whether we're currently exiting qutebrowser.
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explicit: Whether this save operation was triggered explicitly.
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silent: Don't write informations to log. Used to reduce log spam
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when autosaving.
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force: Force saving, no matter what.
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"""
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self.saveables[name].save(is_exit=is_exit, explicit=explicit,
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silent=silent, force=force)
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@pyqtSlot()
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def autosave(self):
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"""Slot used when the configs are auto-saved."""
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for (key, saveable) in self.saveables.items():
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try:
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saveable.save(silent=True)
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except OSError as e:
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message.error("Failed to auto-save {}: {}".format(key, e))
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@cmdutils.register(instance='save-manager', name='save',
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star_args_optional=True)
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def save_command(self, *what):
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"""Save configs and state.
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Args:
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*what: What to save (`config`/`key-config`/`cookies`/...).
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If not given, everything is saved.
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"""
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if what:
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explicit = True
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else:
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what = self.saveables
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explicit = False
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for key in what:
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if key not in self.saveables:
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message.error("{} is nothing which can be saved".format(key))
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else:
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try:
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self.save(key, explicit=explicit, force=True)
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except OSError as e:
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message.error("Could not save {}: {}".format(key, e))
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log.save.debug(":save saved {}".format(', '.join(what)))
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