earwigbot/earwigbot/tasks/__init__.py

# -*- coding: utf-8  -*-
#
# Copyright (C) 2009-2012 by Ben Kurtovic <ben.kurtovic@verizon.net>
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# furnished to do so, subject to the following conditions:
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# The above copyright notice and this permission notice shall be included in
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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from earwigbot import wiki

__all__ = ["BaseTask"]

class BaseTask(object):
    """
    EarwigBot's Base Bot Task

    This package provides built-in wiki bot "tasks" EarwigBot runs. Additional
    tasks can be installed as plugins in the bot's working directory.

    This class (import with `from earwigbot.tasks import BaseTask`) can be
    subclassed to create custom bot tasks.

    To run a task, use :py:meth:`bot.tasks.start(name, **kwargs)
    <earwigbot.managers.TaskManager.start>`. ``**kwargs`` get passed to the
    Task's run() function.
    """
    name = None
    number = 0

    def __init__(self, bot):
        """Constructor for new tasks.

        This is called once immediately after the task class is loaded by
        the task manager (in tasks._load_task()). Don't override this directly
        (or if you do, remember super(Task, self).__init()) - use setup().
        """
        self.bot = bot
        self.config = bot.config
        self.logger = bot.tasks.logger.getChild(self.name)
        self.setup()

    def setup(self):
        """Hook called immediately after the task is loaded.

        Does nothing by default; feel free to override.
        """
        pass

    def run(self, **kwargs):
        """Main entry point to run a given task.

        This is called directly by tasks.start() and is the main way to make a
        task do stuff. kwargs will be any keyword arguments passed to start()
        which are entirely optional.

        The same task instance is preserved between runs, so you can
        theoretically store data in self (e.g.
        start('mytask', action='store', data='foo')) and then use it later
        (e.g. start('mytask', action='save')).
        """
        pass

    def make_summary(self, comment):
        """Makes an edit summary by filling in variables in a config value.

        config.wiki["summary"] is used, where $2 is replaced by the main
        summary body, given as a method arg, and $1 is replaced by the task
        number.

        If the config value is not found, we just return the arg as-is.
        """
        try:
            summary = self.bot.config.wiki["summary"]
        except KeyError:
            return comment
        return summary.replace("$1", str(self.number)).replace("$2", comment)

    def shutoff_enabled(self, site=None):
        """Returns whether on-wiki shutoff is enabled for this task.

        We check a certain page for certain content. This is determined by
        our config file: config.wiki["shutoff"]["page"] is used as the title,
        with $1 replaced by our username and $2 replaced by the task number,
        and config.wiki["shutoff"]["disabled"] is used as the content.

        If the page has that content or the page does not exist, then shutoff
        is "disabled", meaning the bot is supposed to run normally, and we
        return False. If the page's content is something other than what we
        expect, shutoff is enabled, and we return True.

        If a site is not provided, we'll try to use self.site if it's set.
        Otherwise, we'll use our default site.
        """
        if not site:
            try:
                site = self.site
            except AttributeError:
                site = self.bot.wiki.get_site()

        try:
            cfg = self.config.wiki["shutoff"]
        except KeyError:
            return False
        title = cfg.get("page", "User:$1/Shutoff/Task $2")
        username = site.get_user().name()
        title = title.replace("$1", username).replace("$2", str(self.number))
        page = site.get_page(title)

        try:
            content = page.get()
        except wiki.PageNotFoundError:
            return False
        if content == cfg.get("disabled", "run"):
            return False

        self.logger.warn("Emergency task shutoff has been enabled!")
        return True