问题
I found a few other posts on this but none that worked for me yet so I wanted to reach out and see if anyone could explain how to properly get / redirect / set handlers on some of the loggers present in Flask / Werkzeurg / sqlalchemy.
Research prior that could not answer my question:
https://github.com/pallets/flask/issues/1359
http://flask.pocoo.org/docs/dev/logging/
https://gist.github.com/ibeex/3257877
My configurations:
main.py
...
def init_app():
""" Runs prior to app launching, contains initialization code """
# set logging level
if not os.path.exists(settings.LOG_DIR):
os.makedirs(settings.LOG_DIR)
# default level
log_level = logging.CRITICAL
if settings.ENV == 'DEV':
log_level = logging.DEBUG
elif settings.ENV == 'TEST':
log_level = logging.WARNING
elif settings.ENV == 'PROD':
log_level = logging.ERROR
log_formatter = logging.Formatter("[%(asctime)s] {%(pathname)s:%(lineno)d} %(levelname)s - %(message)s")
api_logger = logging.getLogger()
api_handler = TimedRotatingFileHandler(
settings.API_LOG_FILE,
when='midnight',
backupCount=10
)
api_handler.setLevel(log_level)
api_handler.setFormatter(log_formatter)
api_logger.addHandler(api_handler)
logging.getLogger('werkzeug').addHandler(api_handler)
db_logger = logging.getLogger('sqlalchemy')
db_handler = TimedRotatingFileHandler(
settings.DB_LOG_FILE,
when='midnight',
backupCount=10
)
db_handler.setLevel(log_level)
db_handler.setFormatter(log_formatter)
db_logger.addHandler(db_handler)
logging.getLogger('sqlalchemy.engine').addHandler(db_handler)
logging.getLogger('sqlalchemy.dialects').addHandler(db_handler)
logging.getLogger('sqlalchemy.pool').addHandler(db_handler)
logging.getLogger('sqlalchemy.orm').addHandler(db_handler)
# add endpoints
...
if __name__ == '__main__':
init_app()
app.run(host='0.0.0.0', port=7777)
I tried grabbing and changes settings on the loggers a few different ways but I still end up with the werkzeug debug outputting to console and not my logs, I can see the logs are being created but it doesn't look like the loggers are actually outputting to them:
api.log (formatter wrote to it)
2018-02-15 12:03:03,944] {/usr/local/lib/python3.5/dist-packages/werkzeug/_internal.py:88} WARNING - * Debugger is active!
db.log (empty)
Any insight on this would be much appreciated!
UPDATE
I was able to get the werkzeug logger working using the long hand version, it seems the shorthand function calls shown were returning null objects. The sqlalchemy logger is still outputting to console though.. Could the engine configuration be overriding my filehandler?
main.py
...
# close current file handlers
for handler in copy(logging.getLogger().handlers):
logging.getLogger().removeHandler(handler)
handler.close()
for handler in copy(logging.getLogger('werkzeug').handlers):
logging.getLogger('werkzeug').removeHandler(handler)
handler.close()
for handler in copy(logging.getLogger('sqlalchemy.engine').handlers):
logging.getLogger('sqlalchemy.engine').removeHandler(handler)
handler.close()
for handler in copy(logging.getLogger('sqlalchemy.dialects').handlers):
logging.getLogger('sqlalchemy.dialects').removeHandler(handler)
handler.close()
for handler in copy(logging.getLogger('sqlalchemy.pool').handlers):
logging.getLogger('sqlalchemy.pool').removeHandler(handler)
handler.close()
for handler in copy(logging.getLogger('sqlalchemy.orm').handlers):
logging.getLogger('sqlalchemy.orm').removeHandler(handler)
handler.close()
# create our own custom handlers
log_formatter = logging.Formatter("[%(asctime)s] {%(pathname)s:%(lineno)d} %(levelname)s - %(message)s")
api_handler = TimedRotatingFileHandler(
settings.API_LOG_FILE,
when='midnight',
backupCount=10
)
api_handler.setLevel(log_level)
api_handler.setFormatter(log_formatter)
logging.getLogger().setLevel(log_level)
logging.getLogger().addHandler(api_handler)
logging.getLogger('werkzeug').setLevel(log_level)
logging.getLogger('werkzeug').addHandler(api_handler)
db_handler = TimedRotatingFileHandler(
settings.DB_LOG_FILE,
when='midnight',
backupCount=10
)
db_handler.setLevel(log_level)
db_handler.setFormatter(log_formatter)
logging.getLogger('sqlalchemy.engine').addHandler(db_handler)
logging.getLogger('sqlalchemy.engine').setLevel(log_level)
logging.getLogger('sqlalchemy.dialects').addHandler(db_handler)
logging.getLogger('sqlalchemy.dialects').setLevel(log_level)
logging.getLogger('sqlalchemy.pool').addHandler(db_handler)
logging.getLogger('sqlalchemy.pool').setLevel(log_level)
logging.getLogger('sqlalchemy.orm').addHandler(db_handler)
logging.getLogger('sqlalchemy.orm').setLevel(log_level)
database.py
...
engine = create_engine(getDBURI(), echo="debug", echo_pool=True, pool_recycle=10)
ANSWER
For future reference if anyone runs into this issue, sqlalchemy engine configuration echo=True|'debug' will OVERRIDE your loggers. Fixed the issue by changing my engine configuration to:
engine = create_engine(getDBURI(), echo_pool=True, pool_recycle=10)
And then everything worked like a charm. Cheers! :D
回答1:
as i understand it your file based log configuration for werkzeug is actually working => it outputs into api.log
The db log handler is also working (file gets created etc.) but there is no output. This is probably due to the loglevel of those loggers beeing on Error by default. You need to set them manually on a lower level like this:
logging.getLogger('sqlalchemy.engine').setLevel(logging.DEBUG)
logging.getLogger('sqlalchemy.dialects').setLevel(logging.DEBUG)
logging.getLogger('sqlalchemy.pool').setLevel(logging.DEBUG)
logging.getLogger('sqlalchemy.orm').setLevel(logging.DEBUG)
That werkzeug is still outputting to console is probably because there is allways a root logger defined. Before you add your new handlers you should do the following to remove all log handlers:
for handler in copy(logging.getLogger().handlers):
logging.getLogger().removeHandler(handler)
handler.close() # clean up used file handles
Then you can also assign your app log handler as the root log handler with
logging.getLogger().addHandler(api_handler)
If its not the root logger but just the werkzeug logger which has a default console logger defined you can also just remove all handlers from the werkzeug logger before adding yours like this:
for handler in copy(logging.getLogger('werkzeug').handlers):
logging.getLogger('werkzeug').removeHandler(handler)
handler.close() # clean up used file handles
logging.getLogger('werkzeug').addHandler(api_handler)
来源：https://stackoverflow.com/questions/48812971/flask-sqlalchemy-advanced-logging