Python日志: Flask + uWsgi + nginx

Question

总之，当我在uwsgi后面运行我的Flask应用程序时，我无法记录信息和调试消息。不仅没有记录Debug和Info消息，而且格式化也不起作用。

formatter = logging.Formatter(  # pylint: disable=invalid-name
    '%(asctime)s %(levelname)s %(process)d ---- %(threadName)s  '
    '%(module)s : %(funcName)s {%(pathname)s:%(lineno)d} %
    (message)s','%Y-%m-%dT%H:%M:%SZ')

handler = StreamHandler()
handler.setLevel(logging.DEBUG)
handler.setFormatter(formatter)

application.logger.addHandler(handler)

logging.debug('Debug Message')
logging.info('Info Message')
logging.warning('Warning Message')
logging.error('Error Message')
logging.critical('Critical ')

uwsgi日志文件中的输出为：

*** Operational MODE: preforking ***
WARNING:root:Warning Message
ERROR:root:Error Message
CRITICAL:root:Critical 
WSGI app 0 (mountpoint='') ready in 2 seconds on interpreter 0x26f39b0 pid: 9574 (default app)
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI master process (pid: 9574)

从上面可以看到，只有错误、警告和严重消息被记录下来。而且格式化不起作用。(在werkzeug上本地运行时，所有工作都很好)。

uwsgi配置文件如下：

[uwsgi]
project = myproject
uid = nginx
group = nginx
base = /srv
req-logger = file:/var/log/uwsgi/access.log
logger = file:/var/log/uwsgi/error.log

chdir = %(base)/www
home = %(base)/env
module = application
callable = application

master = true
processes = 4

socket = /var/run/uwsgi/%(project).sock
chown-socket = %(uid):%(group)
chmod-socket = 664
vacuum = true

我在StackOverflow上检查了所有的解决方案，但没有一个有效。

任何帮助都是非常感谢的。

Answer 1

通过访问application.logger.addHandler(handler)，您初始化了Flask的记录器。但是，在代码行中，您使用了root记录器和logging.debug('Debug Message')，而不是应用程序记录器和application.logger.debug('Debug Message')。

还有，app.logger.setLevel(logging.DEBUG)。

完整示例：

from flask import Flask
app = Flask(__name__)

formatter = logging.Formatter(  # pylint: disable=invalid-name
    '%(asctime)s %(levelname)s %(process)d ---- %(threadName)s  '
    '%(module)s : %(funcName)s {%(pathname)s:%(lineno)d} %(message)s','%Y-%m-%dT%H:%M:%SZ')

handler = StreamHandler()
handler.setFormatter(formatter)

app.logger.setLevel(logging.DEBUG)
app.logger.addHandler(handler)
app.logger.removeHandler(default_handler)

app.logger.debug('Debug Message')
app.logger.info('Info Message')
app.logger.warning('Warning Message')
app.logger.error('Error Message')
app.logger.critical('Critical ')

打印：

...
2020-10-26T14:13:27Z DEBUG 3197 ---- MainThread  test_log : <module> {test_log.py:77} Debug Message
2020-10-26T14:13:27Z INFO 3197 ---- MainThread  test_log : <module> {test_log.py:78} Info Message
2020-10-26T14:13:27Z WARNING 3197 ---- MainThread  test_log : <module> {test_log.py:79} Warning Message
2020-10-26T14:13:27Z ERROR 3197 ---- MainThread  test_log : <module> {test_log.py:80} Error Message
2020-10-26T14:13:27Z CRITICAL 3197 ---- MainThread  test_log : <module> {test_log.py:81} Critical 
...

Answer 2

请将您的Flask版本更新为1.0.2。下面是一个使用uwsgi-emperor和nginx后面的app.logger的小示例：

def create_app(**kwargs):
    app = Flask(__name__)
    app.logger.setLevel(logging.DEBUG)

    @app.route('/ping/', methods=['GET'])
    def ping_pong():
        app.logger.critical('Healthcheck called')
        app.logger.error('Healthcheck called')
        app.logger.warning('Healthcheck called')
        app.logger.info('Healthcheck called')
        app.logger.debug('Healthcheck called')
        return jsonify({
            'status': 'Epic success',
            'message': 'pong!'
        })

所有日志消息都显示在syslog中：

[2018-05-14 08:43:33,778] CRITICAL in __init__: Healthcheck called
[2018-05-14 08:43:33,779] ERROR in __init__: Healthcheck called
[2018-05-14 08:43:33,779] WARNING in __init__: Healthcheck called
[2018-05-14 08:43:33,779] INFO in __init__: Healthcheck called
[2018-05-14 08:43:33,779] DEBUG in __init__: Healthcheck called

希望这能有所帮助。