CODEWITHSUNDEEP
pythonloggingflask
user2268507
user2268507

Reputation:

Call logger from multiple modules in Flask app

This is how my app is currently set up:

Directory

/xampp/code/menumaster
    menumaster
        __init__.py
        views.py
        sqltables.py

__init__.py

from flask import Flask
from flask.ext.sqlalchemy import SQLAlchemy
from sqlalchemy.orm import sessionmaker
from sqlalchemy import *

app = Flask(__name__)
app.debug = True
DBSession = sessionmaker(bind=engine)
import menumaster.views

views.py

from menumaster import app, DBSession
@app.route('/restaurants', methods = ['GET'])
def getRestaurants():
    # Code here...

I'm wondering where and how I should be configuring the logger such that I would be able to use it in different modules and write to some file mylog.txt.

I have seen examples like this: https://gist.github.com/ibeex/3257877#file-foo-log

However, in my code I don't use

if __name__ == '__main__':

Should I add the logger configuration code in my __init__.py file and try it call from there? Any help with the proper way to do this would be greatly appreciated.

UPDATE

My code currently looks like this:

views.py

import logging
import logging.config

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,

    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %    (thread)d %(message)s'
        },
    },
    'handlers': {
        'file': {
            'level': 'DEBUG',
            'class': 'logging.FileHandler',
            'filename': 'error.log',
            'formatter': 'verbose',
        },
    },
    'loggers': {
        '': {
            'level': 'WARN',
            'handlers': ['file'],
        },
    }
}   

logging.config.dictConfig(LOGGING)
logging.getLogger('sqlalchemy.engine').setLevel(logging.INFO)    
logger = logging.getLogger('__name__')

@app.route('/restaurants', methods = ['GET'])
def getRestaurants():
    logger.debug('write something to log file') 
    return 'something'

I currently have two issues:

1) The text "write something to log file" is not appearing in error.log.

2) When I remove setLevel(logging.INFO) from logging.getLogger('sqlalchemy.engine').setLevel(logging.INFO), nothing is written to error.log. I thought this would work as this information was already set in the LOGGING variable.

I tried changing both the handler and logger level to INFO in LOGGING but to no avail.

Upvotes: 3

Views: 4224

Answers (1)

Mikko Ohtamaa
Mikko Ohtamaa

Reputation: 83348

The best practice is that each Python module declares its own logger like this:

 import logging

 logger = logging.getLogger(__name__)

Then you can use the standard Python logging configuration to increase or decrease logging verbosity per module and redirect log output from different modules to different logging handlers / files.

See configuring Python logging.

Below is a simple logging configuration dict showing how to set up file logging:

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,

    'formatters': {
        'verbose': {
            'format': '%(levelname)s %(asctime)s %(module)s %(process)d %(thread)d %(message)s'
        },
    },


    'handlers': {


        'file': {
            'level': 'DEBUG',
            'class': 'logging.FileHandler',
            'filename': 'logs/django.log',
            'formatter': 'verbose',
        },


    },

    'loggers': {}

        '': {
            'level': 'WARN',
            'handlers': ['file'],
        },

    }
}

Upvotes: 1

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