我正在使用 current_app.logger
,当我尝试登录线程内部时,它显示“在应用程序上下文之外工作”。如何记录来自线程中运行的方法的消息?
def background():
current_app.logger.debug('logged from thread')
@app.route('/')
def index():
Thread(target=background).start()
return 'Hello, World!'
Exception in thread Thread-16:
Traceback (most recent call last):
File "/usr/lib64/python3.5/threading.py", line 914, in _bootstrap_inner
self.run()
File "/usr/lib64/python3.5/threading.py", line 862, in run
self._target(*self._args, **self._kwargs)
File "/home/sapam/demo.py", line 57, in background
current_app.logger.critical('test')
File "/home/sapam/.virtualenvs/demo/lib/python3.5/site-packages/werkzeug/local.py", line 343, in __getattr__
return getattr(self._get_current_object(), name)
File "/home/sapam/.virtualenvs/demo/lib/python3.5/site-packages/werkzeug/local.py", line 302, in _get_current_object
return self.__local()
File "/home/sapam/.virtualenvs/demo/lib/python3.5/site-packages/flask/globals.py", line 51, in _find_app
raise RuntimeError(_app_ctx_err_msg)
RuntimeError: Working outside of application context.
This typically means that you attempted to use functionality that needed
to interface with the current application object in a way. To solve
this set up an application context with app.app_context(). See the
documentation for more information.
127.0.0.1 - - [13/Sep/2016 12:28:24] "GET / HTTP/1.1" 200 -
最佳答案
您以标准方式使用标准logging
模块:获取当前模块的记录器并使用它记录一条消息。
def background():
logging.getLogger(__name__).debug('logged from thread')
app.logger
主要用于内部 Flask 日志记录,或者至少在应用上下文中进行日志记录。如果您在一个线程中,您将不再处于相同的应用程序上下文中。
您可以将 current_app._get_current_object()
传递给线程并使用它代替 current_app
。或者您可以子类化 Thread
来做类似的事情。
def background(app):
app.logger.debug('logged from thread')
@app.route('/')
def index():
Thread(target=background, kwargs={'app': current_app._get_current_object()}).start()
return 'Hello, World!'
class FlaskThread(Thread):
def __init__(self, *args, **kwargs):
super().__init__(*args, **kwargs)
self.app = current_app._get_current_object()
def run(self):
with self.app.app_context():
super().run()
def background():
current_app.logger.debug('logged from thread')
@app.route('/')
def index():
FlaskThread(target=background).start()
return 'Hello, World!'
同样适用于多处理。
关于python - 在线程中使用 Flask current_app.logger,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/39476889/