feat(plugins): Identify plugins by id, migrations must be provided at defined location, add utils for plugin functions

This commit is contained in:
Ferdinand Thiessen 2021-12-23 02:45:51 +01:00
parent c137765fbe
commit 76f660c160
12 changed files with 126 additions and 75 deletions

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@ -1,7 +1,6 @@
import enum
import pkg_resources
from flask import Flask, current_app
from flask import Flask
from flask_cors import CORS
from datetime import datetime, date
from flask.json import JSONEncoder, jsonify
@ -10,7 +9,8 @@ from werkzeug.exceptions import HTTPException
from flaschengeist import logger
from flaschengeist.utils.hook import Hook
from flaschengeist.plugins import AuthPlugin
from flaschengeist.plugins import AuthPlugin, Plugin
from flaschengeist.utils.plugin import get_plugins
from flaschengeist.controller import roleController
from flaschengeist.config import config, configure_app
@ -37,65 +37,36 @@ class CustomJSONEncoder(JSONEncoder):
@Hook("plugins.loaded")
def __load_plugins(app):
logger.debug("Search for plugins")
def load_plugins(app: Flask):
def load_plugin(cls: type[Plugin]):
logger.debug(f"Load plugin {cls.id}")
# Initialize plugin with config section
plugin = cls(config.get(plugin_class.id, config.get(plugin_class.id.split(".")[-1], {})))
# Register blueprint if provided
if plugin.blueprint is not None:
app.register_blueprint(plugin.blueprint)
# Save plugin application context
app.config.setdefault("FG_PLUGINS", {})[plugin.id] = plugin
return plugin
app.config["FG_PLUGINS"] = {}
for entry_point in pkg_resources.iter_entry_points("flaschengeist.plugins"):
logger.debug(f"Found plugin: >{entry_point.name}<")
if entry_point.name == config["FLASCHENGEIST"]["auth"] or (
entry_point.name in config and config[entry_point.name].get("enabled", False)
):
logger.debug(f"Load plugin {entry_point.name}")
try:
plugin = entry_point.load()
if not hasattr(plugin, "name"):
setattr(plugin, "name", entry_point.name)
plugin = plugin(config.get(entry_point.name, {}))
if hasattr(plugin, "blueprint") and plugin.blueprint is not None:
app.register_blueprint(plugin.blueprint)
except:
logger.error(
f"Plugin {entry_point.name} was enabled, but could not be loaded due to an error.",
exc_info=True,
)
continue
if isinstance(plugin, AuthPlugin):
if entry_point.name != config["FLASCHENGEIST"]["auth"]:
logger.debug(f"Unload not configured AuthPlugin {entry_point.name}")
del plugin
continue
else:
logger.info(f"Using authentication plugin: {entry_point.name}")
app.config["FG_AUTH_BACKEND"] = plugin
else:
logger.info(f"Using plugin: {entry_point.name}")
app.config["FG_PLUGINS"][entry_point.name] = plugin
for plugin_class in get_plugins():
names = [plugin_class.id, plugin_class.id.split(".")[-1]]
if config["FLASCHENGEIST"]["auth"] in names:
# Load authentification plugin
app.config["FG_AUTH_BACKEND"] = load_plugin(plugin_class)
logger.info(f"Using authentication plugin: {plugin_class.id}")
elif any([i in config and config[i].get("enabled", False) for i in names]):
# Load all other enabled plugins
load_plugin(plugin_class)
logger.info(f"Using plugin: {plugin_class.id}")
else:
logger.debug(f"Skip disabled plugin {entry_point.name}")
logger.debug(f"Skip disabled plugin {plugin_class.id}")
if "FG_AUTH_BACKEND" not in app.config:
logger.error("No authentication plugin configured or authentication plugin not found")
logger.fatal("No authentication plugin configured or authentication plugin not found")
raise RuntimeError("No authentication plugin configured or authentication plugin not found")
@Hook("plugins.installed")
def install_all():
from flaschengeist.database import db
db.create_all()
db.session.commit()
for name, plugin in current_app.config["FG_PLUGINS"].items():
if not plugin:
logger.debug(f"Skip disabled plugin: {name}")
continue
logger.info(f"Install plugin {name}")
plugin.install()
if plugin.permissions:
roleController.create_permissions(plugin.permissions)
def create_app(test_config=None):
def create_app(test_config=None, cli=False):
app = Flask("flaschengeist")
app.json_encoder = CustomJSONEncoder
CORS(app)
@ -106,7 +77,7 @@ def create_app(test_config=None):
configure_app(app, test_config)
db.init_app(app)
migrate.init_app(app, db, compare_type=True)
__load_plugins(app)
load_plugins(app)
@app.route("/", methods=["GET"])
def __get_state():

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@ -24,9 +24,16 @@ migrate = Migrate()
def configure_alembic(config):
"""Alembic configuration hook
Inject all migrations paths into the ``version_locations`` config option.
This includes even disabled plugins, as simply disabling a plugin without
uninstall can break the alembic version management.
"""
import inspect, pathlib
from flaschengeist.utils.plugin import get_plugins
# Load migration paths from plugins
migrations = [str(p.migrations_path) for p in current_app.config["FG_PLUGINS"].values() if p and p.migrations_path]
migrations = [(pathlib.Path(inspect.getfile(p)).parent / "migrations") for p in get_plugins()]
migrations = [str(m.resolve()) for m in migrations if m.exists()]
if len(migrations) > 0:
# Get configured paths
paths = config.get_main_option("version_locations")

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@ -24,9 +24,7 @@ For more information, please refer to
- `flaschengeist.utils.hook.HookAfter`
"""
import pkg_resources
from werkzeug.exceptions import MethodNotAllowed, NotFound
from flaschengeist.models.user import _Avatar, User
from flaschengeist.utils.hook import HookBefore, HookAfter
__all__ = [
@ -105,9 +103,16 @@ class Plugin:
- *version*: Version of your plugin, can also be guessed by Flaschengeist
"""
blueprint = None # You have to override
id: str = None
"""Override with the unique ID of the plugin
Hint: Use a fully qualified name like "dev.flaschengeist.plugin"
"""
blueprint = None
"""Override with a `flask.blueprint` if the plugin uses custom routes"""
permissions = [] # You have to override
permissions: list[str] = [] # You have to override
"""Override to add custom permissions used by the plugin
A good style is to name the permissions with a prefix related to the plugin name,
@ -131,7 +136,6 @@ class Plugin:
Args:
config: Dict configuration containing the plugin section
"""
self.version = pkg_resources.get_distribution(self.__module__.split(".")[0]).version
def install(self):
"""Installation routine
@ -140,6 +144,17 @@ class Plugin:
"""
pass
def uninstall(self):
"""Uninstall routine
If the plugin has custom database tables, make sure to remove them.
This can be either done by downgrading the plugin *head* to the *base*.
Or use custom migrations for the uninstall and *stamp* some version.
Is always called with Flask application context.
"""
pass
def get_setting(self, name: str, **kwargs):
"""Get plugin setting from database
@ -192,6 +207,11 @@ class Plugin:
class AuthPlugin(Plugin):
"""Base class for all authentification plugins
See also `Plugin`
"""
def login(self, user, pw):
"""Login routine, MUST BE IMPLEMENTED!
@ -254,7 +274,7 @@ class AuthPlugin(Plugin):
"""
raise MethodNotAllowed
def get_avatar(self, user: User) -> _Avatar:
def get_avatar(self, user):
"""Retrieve avatar for given user (if supported by auth backend)
Default behavior is to use native Image objects,
@ -286,7 +306,7 @@ class AuthPlugin(Plugin):
user.avatar_ = imageController.upload_image(file)
def delete_avatar(self, user: User):
def delete_avatar(self, user):
"""Delete the avatar for given user (if supported by auth backend)
Default behavior is to use the imageController and native Image objects.

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@ -13,8 +13,8 @@ from flaschengeist.controller import sessionController, userController
class AuthRoutePlugin(Plugin):
name = "auth"
blueprint = Blueprint(name, __name__)
id = "dev.flaschengeist.auth"
blueprint = Blueprint("auth", __name__)
@AuthRoutePlugin.blueprint.route("/auth", methods=["POST"])

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@ -17,6 +17,8 @@ from flaschengeist.plugins import AuthPlugin, before_role_updated
class AuthLDAP(AuthPlugin):
id = "auth_ldap"
def __init__(self, config):
super().__init__()
app.config.update(

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@ -14,6 +14,8 @@ from flaschengeist import logger
class AuthPlain(AuthPlugin):
id = "auth_plain"
def install(self):
plugins_installed(self.post_install)

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@ -57,9 +57,10 @@ def service_debit():
class BalancePlugin(Plugin):
name = "balance"
"""Balance Plugin"""
id = "dev.flaschengeist.balance"
blueprint = Blueprint(name, __name__)
blueprint = Blueprint("balance", __name__)
permissions = permissions.permissions
plugin: "BalancePlugin" = LocalProxy(lambda: current_app.config["FG_PLUGINS"][BalancePlugin.name])
models = models

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@ -12,6 +12,8 @@ from . import Plugin
class MailMessagePlugin(Plugin):
id = "dev.flaschengeist.mail_plugin"
def __init__(self, config):
super().__init__()
self.server = config["SERVER"]

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@ -17,9 +17,9 @@ from . import pricelist_controller, permissions
class PriceListPlugin(Plugin):
name = "pricelist"
id = "dev.flaschengeist.pricelist"
permissions = permissions.permissions
blueprint = Blueprint(name, __name__, url_prefix="/pricelist")
blueprint = Blueprint("pricelist", __name__, url_prefix="/pricelist")
plugin = LocalProxy(lambda: current_app.config["FG_PLUGINS"][PriceListPlugin.name])
models = models

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@ -16,8 +16,8 @@ from . import permissions
class RolesPlugin(Plugin):
name = "roles"
blueprint = Blueprint(name, __name__)
id = "dev.flaschengeist.roles"
blueprint = Blueprint("roles", __name__)
permissions = permissions.permissions

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@ -18,8 +18,8 @@ from flaschengeist.utils.datetime import from_iso_format
class UsersPlugin(Plugin):
name = "users"
blueprint = Blueprint(name, __name__)
id = "dev.flaschengeist.users"
blueprint = Blueprint("users", __name__)
permissions = permissions.permissions

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@ -0,0 +1,46 @@
"""Plugin utils
Utilities for handling Flaschengeist plugins
"""
import pkg_resources
from flaschengeist import logger
from flaschengeist.plugins import Plugin
def get_plugins() -> list[type[Plugin]]:
"""Get all installed plugins for Flaschengeist
Returns:
list of classes implementing `flaschengeist.plugins.Plugin`
"""
logger.debug("Search for plugins")
plugins = []
for entry_point in pkg_resources.iter_entry_points("flaschengeist.plugins"):
try:
logger.debug(f"Found plugin: >{entry_point.name}<")
plugin_class = entry_point.load()
if issubclass(plugin_class, Plugin):
plugins.append(plugin_class)
except TypeError:
logger.error(f"Invalid entry point for plugin {entry_point.name} found.")
return plugins
def plugin_version(plugin: type[Plugin]) -> str:
"""Get version of plugin
Returns the version of a plugin, if plugin does not set the
version property, the version of the package providing the
plugin is taken.
Args:
plugin: Plugin or Plugin class
Returns:
Version as string
"""
if plugin.version:
return plugin.version
return pkg_resources.get_distribution(plugin.__module__.split(".", 1)[0]).version