flask.cli AppGroup Example Code

AppGroup is a class within the flask.cli module of the Flask project. It works like the Click Group class and automatically wraps the functions using with_appcontext.

DispatchingApp, FlaskGroup, ScriptInfo, pass_script_info, and with_appcontext are several other callables with code examples from the same flask.cli package.

Example 1 from indico

indico (project website, documentation and sandbox demo) is a Flask-based web app for event management. The code is open sourced under the MIT license.

indico / indico / cli / util.py

# util.py

from __future__ import unicode_literals

import traceback
from importlib import import_module

import click
from flask.cli import AppGroup, FlaskGroup, ScriptInfo
from flask_pluginengine import wrap_in_plugin_context
from werkzeug.utils import cached_property




def _create_app(info):
    from indico.web.flask.app import make_app
    return make_app(set_path=True)


class IndicoFlaskGroup(FlaskGroup):

    def __init__(self, **extra):
        super(IndicoFlaskGroup, self).__init__(create_app=_create_app, add_default_commands=False,
                                               add_version_option=False, set_debug_flag=False, **extra)
        self._indico_plugin_commands = None

    def _load_plugin_commands(self):
        assert False

    def _wrap_in_plugin_context(self, plugin, cmd):
        cmd.callback = wrap_in_plugin_context(plugin, cmd.callback)
        for subcmd in getattr(cmd, 'commands', {}).viewvalues():
            self._wrap_in_plugin_context(plugin, subcmd)

    def _get_indico_plugin_commands(self, ctx):
        if self._indico_plugin_commands is not None:
            return self._indico_plugin_commands
        try:
            from indico.core import signals
            from indico.util.signals import named_objects_from_signal
            ctx.ensure_object(ScriptInfo).load_app()
            cmds = named_objects_from_signal(signals.plugin.cli.send(), plugin_attr='_indico_plugin')
            rv = {}
            for name, cmd in cmds.viewitems():
                if cmd._indico_plugin:
                    self._wrap_in_plugin_context(cmd._indico_plugin, cmd)
                rv[name] = cmd
        except Exception as exc:
            if 'No indico config found' not in unicode(exc):
                click.echo(click.style('Loading plugin commands failed:', fg='red', bold=True))
                click.echo(click.style(traceback.format_exc(), fg='red'))
            rv = {}
        self._indico_plugin_commands = rv
        return rv

    def get_command(self, ctx, name):
        rv = AppGroup.get_command(self, ctx, name)
        if rv is not None:
            return rv
        return self._get_indico_plugin_commands(ctx).get(name)

    def list_commands(self, ctx):
        rv = set(click.Group.list_commands(self, ctx))
        rv.update(self._get_indico_plugin_commands(ctx))
        return sorted(rv)


class LazyGroup(click.Group):

    def __init__(self, import_name, **kwargs):
        self._import_name = import_name
        super(LazyGroup, self).__init__(**kwargs)

    @cached_property
    def _impl(self):
        module, name = self._import_name.split(':', 1)
        return getattr(import_module(module), name)

    def get_command(self, ctx, cmd_name):
        return self._impl.get_command(ctx, cmd_name)



## ... source file continues with no further AppGroup examples...

Sponsored By

Sentry logo

Software errors are inevitable. Chaos is not. Try Sentry for free.


AssemblyAI logo

The most accurate speech-to-text API. Built for Python developers.

Full Stack Python

Full Stack Python is an open book that explains concepts in plain language and provides helpful resources for those topics.
Updates via Twitter & Facebook.

Matt Makai 2012-2020