请求操作之前和之后的烧瓶不起作用/打印任何东西答案

【问题标题】：flask before and after request operations not working/printing anything请求操作之前和之后的烧瓶不起作用/打印任何东西
【发布时间】：2021-03-15 16:16:19
【问题描述】：

所以我有一个奇怪的错误，之前和之后的操作都不起作用。他们之前写入 requests.log 文件，但现在不起作用，并且控制台的常规打印语句不起作用，我不知道为什么：


# function to handle bson type returned by mongodb
# taken from https://stackoverflow.com/a/18405626
def parse_json(data):
    return json.loads(json_util.dumps(data))

app = flask.Flask(__name__)
api = Api(app)

#we will be logging the API end point that was accessed, the time it was accessed, and how long it took to address the request
#all logging will be to a local file, requests.log.
@app.before_request
def start_timer():
    g.start = time.time()

@app.after_request
def log_request(response):
    now = time.time()
    duration = round(now - g.start, 2)
    print(response.get_data())  #not working
    f = open("requests.log", "a+")
    f.write("testing") #also not working
    f.write("The following request took ({}) seconds".format(duration)) #not working
    f.write("\n")
    f.close()
    print("dhefei") #not working
    app.logger.info('Processing default request') #not working
    print(request.url, request.remote_addr,file=sys.stderr)
    return response

这些操作之外的任何打印语句都可以工作。

【问题讨论】：

标签： python flask flask-restful

【解决方案1】：

我测试了你的代码，看起来不错！但更新很少。

from flask import g, request, Flask
import logging
import time
import sys


logging.basicConfig(
    format='%(asctime)-15s %(levelname)-8s %(name)-1s: %(message)s',
    level=logging.DEBUG)

logging.getLogger("requests").setLevel(logging.WARNING)
logging.getLogger("urllib3").setLevel(logging.WARNING)

# function to handle bson type returned by mongodb
# taken from https://stackoverflow.com/a/18405626
def parse_json(data):
    return json.loads(json_util.dumps(data))

app = Flask(__name__)

@app.route('/')
def hello_world():
    time.sleep(4)
    return 'Hello, World!'

@app.before_request
def start_timer():
    g.start = time.time()

@app.after_request
def log_request(response):
    now = time.time()
    duration = round(now - g.start, 2)
    logging.info(response.get_data())  #not working
    logging.info("testing") #also not working
    logging.info("The following request took ({}) seconds".format(duration)) #not working
    logging.info("dhefei") #not working
    logging.info('Processing default request') #not working
    return response


if __name__ == '__main__':
    app.run(host='localhost', port=9999)

在控制台中：

python3 flaskapp.py
 * Serving Flask app "flaskapp" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
2021-03-15 11:13:13,723 INFO     werkzeug:  * Running on http://localhost:9999/ (Press CTRL+C to quit)
2021-03-15 11:13:19,982 INFO     root: b'Hello, World!'
2021-03-15 11:13:19,982 INFO     root: testing
2021-03-15 11:13:19,983 INFO     root: The following request took (4.0) seconds
2021-03-15 11:13:19,983 INFO     root: dhefei
2021-03-15 11:13:19,983 INFO     root: Processing default request
2021-03-15 11:13:19,985 INFO     werkzeug: 127.0.0.1 - - [15/Mar/2021 11:13:19] "GET / HTTP/1.1" 200 -

【讨论】：