<commit_before>"""
Registry for loading and managing multiple plugins at run-time

- Holds the class and the object that contains all code to maintain plugin states
- Manages setup and teardown of plugin class instances
"""

import importlib
import pathlib
import logging
import os
import subprocess

from typing import OrderedDict
from importlib import reload

from django.apps import apps
from django.conf import settings
from django.db.utils import OperationalError, ProgrammingError, IntegrityError
from django.urls import include, re_path
from django.urls import clear_url_caches
from django.contrib import admin
from django.utils.text import slugify

try:
    from importlib import metadata
except:  # pragma: no cover
    import importlib_metadata as metadata
    # TODO remove when python minimum is 3.8

from maintenance_mode.core import maintenance_mode_on
from maintenance_mode.core import get_maintenance_mode, set_maintenance_mode

from .integration import IntegrationPluginBase
from .helpers import handle_error, log_error, get_plugins, IntegrationPluginError


logger = logging.getLogger('inventree')


class PluginsRegistry:
    """
    The PluginsRegistry class
    """

    def __init__(self) -> None:
        # plugin registry
        self.plugins = {}
        self.plugins_inactive = {}

        self.plugin_modules = []         # Holds all discovered plugins

        self.errors = {}                 # Holds discovering errors

        # flags
        self.is_loading = False
        self.apps_loading = True        # Marks if apps were reloaded yet
        self.git_is_modern = True       # Is a modern version of git available

        # integration specific
        self.installed_apps = []         # Holds all added plugin_paths

        # mixins
        self.mixins_settings = {}

    def get_plugin(self, slug):
        """
        Lookup plugin by slug (unique key).
        """

        if slug not in self.plugins:
            logger.warning(f"Plugin registry has no record of plugin '{slug}'")
            return None

        return self.plugins[slug]

    def call_plugin_function(self, slug, func, *args, **kwargs):
        """
        Call a member function (named by 'func') of the plugin named by 'slug'.

        As this is intended to be run by the background worker,
        we do not perform any try/except here.

        Instead, any error messages are returned to the worker.
        """

        plugin = self.get_plugin(slug)

        if not plugin:
            return

        # Check that the plugin is enabled
        config = plugin.plugin_config()

        if config and config.active:

            plugin_func = getattr(plugin, func)

            return plugin_func(*args, **kwargs)

    # region public functions
    # region loading / unloading
    def load_plugins(self):
        """
        Load and activate all IntegrationPlugins
        """
        if not settings.PLUGINS_ENABLED:
            # Plugins not enabled, do nothing
            return  # pragma: no cover

        logger.info('Start loading plugins')

        # Set maintanace mode
        _maintenance = bool(get_maintenance_mode())
        if not _maintenance:
            set_maintenance_mode(True)

        registered_successful = False
        blocked_plugin = None<commit_msg>Fix plugin registry function so tests pass<commit_after>"""
Registry for loading and managing multiple plugins at run-time

- Holds the class and the object that contains all code to maintain plugin states
- Manages setup and teardown of plugin class instances
"""

import importlib
import pathlib
import logging
import os
import subprocess

from typing import OrderedDict
from importlib import reload

from django.apps import apps
from django.conf import settings
from django.db.utils import OperationalError, ProgrammingError, IntegrityError
from django.urls import include, re_path
from django.urls import clear_url_caches
from django.contrib import admin
from django.utils.text import slugify

try:
    from importlib import metadata
except:  # pragma: no cover
    import importlib_metadata as metadata
    # TODO remove when python minimum is 3.8

from maintenance_mode.core import maintenance_mode_on
from maintenance_mode.core import get_maintenance_mode, set_maintenance_mode

from .integration import IntegrationPluginBase
from .helpers import handle_error, log_error, get_plugins, IntegrationPluginError


logger = logging.getLogger('inventree')


class PluginsRegistry:
    """
    The PluginsRegistry class
    """

    def __init__(self) -> None:
        # plugin registry
        self.plugins = {}
        self.plugins_inactive = {}

        self.plugin_modules = []         # Holds all discovered plugins

        self.errors = {}                 # Holds discovering errors

        # flags
        self.is_loading = False
        self.apps_loading = True        # Marks if apps were reloaded yet
        self.git_is_modern = True       # Is a modern version of git available

        # integration specific
        self.installed_apps = []         # Holds all added plugin_paths

        # mixins
        self.mixins_settings = {}

    def get_plugin(self, slug):
        """
        Lookup plugin by slug (unique key).
        """

        if slug not in self.plugins:
            logger.warning(f"Plugin registry has no record of plugin '{slug}'")
            return None

        return self.plugins[slug]

    def call_plugin_function(self, slug, func, *args, **kwargs):
        """
        Call a member function (named by 'func') of the plugin named by 'slug'.

        As this is intended to be run by the background worker,
        we do not perform any try/except here.

        Instead, any error messages are returned to the worker.
        """

        plugin = self.get_plugin(slug)

        if not plugin:
            return

        plugin_func = getattr(plugin, func)

        return plugin_func(*args, **kwargs)

    # region public functions
    # region loading / unloading
    def load_plugins(self):
        """
        Load and activate all IntegrationPlugins
        """
        if not settings.PLUGINS_ENABLED:
            # Plugins not enabled, do nothing
            return  # pragma: no cover

        logger.info('Start loading plugins')

        # Set maintanace mode
        _maintenance = bool(get_maintenance_mode())
        if not _maintenance:
            set_maintenance_mode(True)

        registered_successful = False
        blocked_plugin = None
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