我正在使用带有app工厂模式的烧瓶。我知道app工厂模式仅在工厂函数中管理配置对象。 (如下面的代码所示)
def create_app(config):
app.config.from_object(config)
sentry.init(app)
...
return app
但是,如何管理需要该配置的额外模块,但无法在应用创建时创建初始化?
所以我想做点什么
def create_app(config):
some_module_obj = Module(host=config.host, port=config.port)
app.config.from_object(config)
sentry.init(app)
return some_module_obj, app
而不是
# I don't want to use `config` outside of the `create_app` function!
some_module_obj = Module(host=config.host, port=config.port)
def create_app(config):
app.config.from_object(config)
sentry.init(app)
return app
不确定这是你需要的,但你在评论中要求一个小例子与inject + Flask
。据我所知,主要问题与Flask + configuration + initialization
有关。这只是它如何工作的一个例子。
app.朋友:
from flask import Flask
from api import bp
from configurator import configure
def create_app():
app = Flask(__name__)
# configure Flask app config as you wish... (app.config.from_object(config))
# just some settings for demonstration
app.config.update(dict(
MODULE1_TIMER=1,
MODULE2_LIMIT=2,
))
# configure inject using app context and Flask config
with app.app_context():
configure()
# demo blueprint
app.register_blueprint(bp)
return app
if __name__ == '__main__':
create_app().run(debug=True)
让我们假设我们有一些模块:
# mod1.py
class Module1:
def __init__(self, timer: int) -> None:
self._timer = timer
# mod2.py
class Module2:
def __init__(self, limit: int) -> None:
self._limit = limit
def get_limit(self):
return self._limit
# mod3.py - works with mod1 and mod2
class Module3:
def __init__(self, module1, module2) -> None:
self._module1 = module1
self._module2 = module2
def get_limit(self):
return self._module2.get_limit()
config u rat or.朋友:
import inject
from flask import current_app
from mod1 import Module1
from mod2 import Module2
from mod3 import Module3
@inject.params(
module1=Module1,
module2=Module2,
)
def _init_module3(module1, module2):
# module1 and module2 are injected instances
return Module3(module1, module2)
def _injector_config(binder):
# initialization of Module1 and Module2 using Flask config
binder.bind(Module1, Module1(current_app.config['MODULE1_TIMER']))
binder.bind(Module2, Module2(current_app.config['MODULE2_LIMIT']))
# initialization of Module3 using injected Module1 + Module2
# you can use bind_to_constructor + any function
binder.bind_to_constructor(Module3, _init_module3)
def configure():
def config(binder):
binder.install(_injector_config)
# one more binder.install... etc...
inject.clear_and_configure(config)
API.朋友:
import inject
from flask import Blueprint, jsonify
from mod1 import Module1
from mod2 import Module2
from mod3 import Module3
bp = Blueprint('api', __name__)
@bp.route('/test')
def test():
# get instances which was created using inject
return jsonify(dict(
module1=str(type(inject.instance(Module1))),
module2=str(type(inject.instance(Module2))),
module3=str(type(inject.instance(Module3))),
))
# you can inject something as arg
@bp.route('/test2')
@inject.params(module3=Module3)
def test2(module3: Module3):
return jsonify(dict(module3=str(type(module3))))
@bp.route('/test3')
def test3():
# you can inject something into anything
class Example:
module3 = inject.attr(Module3)
@inject.params(module2=Module2)
def __init__(self, module2: Module2) -> None:
self.module2 = module2
return jsonify({
'MODULE2_LIMIT': Example.module3.get_limit(),
'example': dir(Example()),
})
运行服务器,打开qazxsw poi,qazxsw poi,qazxsw poi。
关于好处的几句话:
希望这可以帮助。
决定将初始化对象的自定义类作为工厂模式。
这是一个例子:
/test
并在test2
(具有/test3
功能)
class CustomFactory(metaclass=ABCMeta):
@abstractmethod
def init_factory(self, config):
pass
@property
@abstractmethod
def app(self):
pass
def __getattr__(self, item):
return getattr(self.app, item)
class RQSchedulerFactory(CustomFactory):
def __init__(self):
self._app = None
def init_factory(self, config):
self._app = Scheduler(connection=Redis(host=config.REDIS_HOST, port=config.REDIS_PORT))
@property
def app(self):
return self._app
class FireDBFactory(CustomFactory):
@property
def app(self):
return self._app
def __init__(self):
self._app = None
def init_factory(self, config):
cred = credentials.Certificate(config.FIREBASE_KEY_FILE)
firebase_admin.initialize_app(cred)
self._app = firestore.client()
在__init__.py
函数中,初始化如下:
create_app