Day3 -- flag state holding, exception handling and request hook

State to keep

cookie Realization way

Generate cookie

from flask import Flask,make_response,request
from bak.testing.settings.config import DefaultConfig  # The second kind 
app=Flask(__name__)
#  Set up SECRET_KEY Configuration information ,  You have to set ,  Otherwise, throw it out of order   Two ways 
# app.config['SECRET_KEY'] = '[email protected]#[email protected]#sdkjf0934FHJNJGI' # The first one is 
app.config.from_object(DefaultConfig)    # The second kind 

# Generate cookie
@app.route('/set_cookie')
def set_cookie():
    resp=make_response(' Set up cookie')   
    #name Wei Jian  zhangsan Value  #max_age=60 Set up 60 Seconds valid 
    resp.set_cookie('name','zhangsan',max_age=60)
    return resp

The second way to create a folder is to create a folder py File settings configuration information

Get print out saved cookie

from flask import Flask,make_response,request
from bak.testing.settings.config import DefaultConfig
app=Flask(__name__)
app.config.from_object(DefaultConfig)
# obtain cookie
@app.route('/get_cookie')
def get_cookie():
    name=request.cookies.get('name')
    resp=make_response(' obtain cookie')
    print(name)
    return resp

Delete saved cookie

from flask import Flask,make_response,request
from bak.testing.settings.config import DefaultConfig
app=Flask(__name__)
app.config.from_object(DefaultConfig)
# Delete cookie
@app.route('/del_cookie')
def del_cookie():
    resp=make_response(' Delete cookie')
    resp.delete_cookie('name')
    return resp

session Realization way

Generate session

from flask import Flask,make_response,request,session
from bak.testing.settings.config import DefaultConfig  # The second kind 
app=Flask(__name__)
#  Set up SECRET_KEY Configuration information ,  You have to set ,  Otherwise, throw it out of order   Two ways 
# app.config['SECRET_KEY'] = '[email protected]#[email protected]#sdkjf0934FHJNJGI' # The first one is 
app.config.from_object(DefaultConfig)    # The second kind 
# Generate session
@app.route('/set_session')
def set_session():
    session['password']='123456'
    return 'session Set up the success '

Check to get session

from flask import Flask,make_response,request,session
from bak.testing.settings.config import DefaultConfig
app=Flask(__name__)
app.config.from_object(DefaultConfig)
# Check to get session
@app.route('/get_session')
def get_session():
    pwd=session.get('password')
    return pwd

Delete session

from flask import Flask,make_response,request,session
from bak.testing.settings.config import DefaultConfig
app=Flask(__name__)
app.config.from_object(DefaultConfig)
# Delete session
@app.route('/del_session')
def del_session():
    resp=make_response(' Delete session')
    resp.delete_cookie('session')
    return resp

Login function realization preservation session

from flask import Flask,make_response,request,session
from bak.testing.settings.config import DefaultConfig
app=Flask(__name__)
app.config.from_object(DefaultConfig)
# Login implementation   preservation session
@app.route('/login')
def login():
    # Get user name and password 
    username=request.args.get('username')
    password=request.args.get('password')
    # Verify user name and password 
    real_username='zhangsan'
    real_password='123456'
    if username!=real_username:
        return ' User name error '
    if password!=real_password:
        return ' Wrong password '
    session['name']=username
    return ' Login successful '
# View login account name 
@app.route('/home')
def home():
    username=session.get('name')
    return username
# Log out 
@app.route('/logout')
def logout():
    resp=make_response(' Quit successfully ')
    resp.delete_cookie('session')
    return resp

Login successful

exception handling

# abort() Examples of throwing exceptions with custom exception information 
from flask import Flask
#  Import abort
from flask import abort
@app.route('/error')
def error():
	# have access to try Conditions 
    # Actively throw an exception   Custom status code 
    abort(500)
@app.errorhandler(500)
def get_error(e):
    return ' Something went wrong '

request hook

@app.route('/page')
def page():
    print(' The page executes ')
    return ' The page executes '

@app.before_first_request
def first():
    print(' Execute before page request , Only once ')
    
@app.before_request
def before():
    print(' Before each page processing request , All implemented ')
    
@app.after_request
# Be careful  res Must return   Otherwise, an error message cannot be generated cookie
def after(res):
    print(' Execute after the page processing request , Error reporting may not be implemented ')
    return res
    
@app.teardown_request
def tr(e):
    print(e)
    print(' Execute after the page processing request , Error reporting will also be implemented ')