How to Get Instance of a Plugin？

[jsky]

How to Get Instance of a Plugin Using Calibre's Plugin Framework？
Is there a method like Source.get_plugin_by_name() to get a specific plugin's instance by its name (although I know it does not exist)?

[jsky]

Because I want to call plugins written by other authors in the plugin I am editing.

[kovidgoyal]

Look at the functions in

calibre.customize.ui

they give you access to all types of calibre plugins.

[jsky]

Originally Posted by kovidgoyal

Look at the functions in

calibre.customize.ui

they give you access to all types of calibre plugins.

Thank you！Calibre MASTER

and still a little problem --

I am writing a InterfaceAction plugin, in which I want to call a Source plugin function.
Now i have the source plugin instance

from calibre.customize.ui import find_plugin
plugin = find_plugin("plugin_name")

But the function I want to Call is

    def identify(
            self,
            log,
            result_queue,
            abort,
            title=None,
            authors=None,  # {{{
            identifiers={},
            timeout=30)

However, I'm not sure how to pass the "log" parameter, as it seems like it's coming from outside the function. How can I pass this parameter correctly?

[jsky]

Could this method cause initialization timing issues when one plugin depends on another?

[kovidgoyal]

Dont call other plugins in your plugins initialize method and you wont have initialization issues. As for parameters to pass to identify() looka t how calibre itself calls the plugin identify methods, in sources/identify.py

[jsky]

Originally Posted by kovidgoyal

Dont call other plugins in your plugins initialize method and you wont have initialization issues. As for parameters to pass to identify() looka t how calibre itself calls the plugin identify methods, in sources/identify.py

I read the identify.py and found

class Worker(Thread):

    def __init__(self, plugin, kwargs, abort):
        Thread.__init__(self)
        self.daemon = True

        self.plugin, self.kwargs, self.rq = plugin, kwargs, Queue()
        self.abort = abort
        self.buf = StringIO()
        self.log = create_log(self.buf)

    def run(self):
        start = time.time()
        try:
            self.plugin.identify(self.log, self.rq, self.abort, **self.kwargs)
        except Exception:
            self.log.exception('Plugin', self.plugin.name, 'failed')
        self.plugin.dl_time_spent = time.time() - start

does it means I have to create a new thread and create a log to pass to identify function?
or is it possible to get the existing instance of "self.log"?

[kovidgoyal]

from calibre.utils.logging import default_log