ビュー機能以外のセッション変数を使用できません

Question

ユーザがユーザ名とパスワードを入力するログインページがあります。私は/ login view関数でセッション変数としてユーザー名を作成し、if-elseブロック内のコード本体のビュー関数の外でこの変数を使用したいと考えています。

session['username'] = request.form['username'].lower() 

どうすればよいですか？ここで

は、このためのコードの一部です：

import os 
import csv 
import pymysql 
import pymysql.cursors 
from datetime import date 
import calendar 
import ssl 
from ldap3 import Connection, Server, ANONYMOUS, SIMPLE, SYNC, ASYNC,ALL 
from flask import Flask, make_response,render_template,url_for,redirect,request,session,escape 
from validusers import users 

app = Flask(__name__) 
IT = pymysql.connect(host='xx.xx.xx.xx', user='xxxxx', password='xxxxx', 
      db='xxxx')#Connect to the IT database 
Others = pymysql.connect(host='xxxxx', user='xxxxxx', password='xxxxxx', 
      db='xxxxx')#Connect to the non IT database 
a=IT.cursor() # Open Cursor for IT database 
b=Others.cursor()#Open Cursor for non-IT database 
**@app.route('/') 
@app.route('/login',methods=['GET', 'POST']) 
def login(): 
    error=None 
    if request.method =='POST': 

     #if not request.form['username']: 
      #error='You forgot to enter "Username", please try again' 
      #return render_template('login.html',error=error) 
     if request.form['username'].lower() not in users: 
      error='You are not authorized to view this page !!' 
      return render_template('login.html',error=error) 

     #if not request.form['password']: 
      #error='You forgot to enter "Password", please try again' 
      #return render_template('login.html',error=error) 
     #else: 
      #s = Server('appauth.corp.domain.com:636', use_ssl=True, get_info=ALL) 
      #c = Connection(s,user=request.form['username'],password=request.form['password'],check_names=True, lazy=False,raise_exceptions=False) 
      #c.open() 
      #c.bind() 
      #if (c.bind() != True) is True: 
       #error='Invalid credentials. Please try again' 
      #else: 
       #session['username'] = request.form['username'].lower() 
       #return redirect(url_for('index')) 

    return render_template('login.html',error=error)** 



@app.route('/index',methods=['GET','POST']) 
def index(): 
    if 'username' in session: 
     return render_template('index.html') 



Filename = os.getenv("HOMEDRIVE") + os.getenv("HOMEPATH") + "\\Desktop\RosterUnified.csv" # Create/write a CSV file in the user's desktop 
Filename1=os.getenv("HOMEDRIVE") + os.getenv("HOMEPATH") + "\\Desktop\RosterCurrentMonth.csv" 
d=open(Filename, 'w',newline='\n') #Format for CSV input 
c = csv.writer(d) 
c.writerow(["Manager NT ID"," Vertical Org","Employee ID" ]+ dayssl)# Write the header list of strings in the first row 
for row in result_IT: 
    c.writerow(row)#Write output for IT to csv 
d.close() 

#result_IT and result_Oters part of code is ommitted 
e=open(Filename, 'a',newline='\n') 

f= csv.writer(e) 
for row in result_Others: 
    f.writerow(row)# Append to the existing CSV file with non IT data 
e.close() 

x=session['username'] 
sql="select verticalorg from tbl_employeedetails where empntid=(%s)" 
args=x 
a.execute(sql,args) 
b.execute(sql,args) 
c=a.fetchall() 
d1=b.fetchall() 
s=c+d1 
q=[x[0] for x in s] 
sql1="select role from tbl_employeedetails where empntid=(%s)" 
a.execute(sql1,args) 
b.execute(sql1,args) 
c1=a.fetchall() 
d2=b.fetchall() 
Role=c1+d2 
r=[x[0] for x in Role] 
if r=='O': 
    if q==27: 
     f1=open(Filename,'r',newline='\n') 
     f2=open(Filename1,'w',newline='\n') 
     reader = csv.DictReader(f1) 
     writer = csv.writer(f2) 
     writer.writerow(["Manager NT ID"," Vertical Org","Employee ID" ]+ dayssl) 
     rows = [row for row in reader if row['Vertical Org'] == 'HR'] 
     writer.writerow[row in rows] 
    elif q==2: 
     f1=open(Filename,'r',newline='\n') 
     f2=open(Filename1,'w',newline='\n') 
     reader = csv.DictReader(f1) 
     writer = csv.writer(f2) 
     writer.writerow(["Manager NT ID"," Vertical Org","Employee ID" ]+ dayssl) 

    f2.close() 
    z=open(Filename1) 
    with z as f: 
     p = f.read() 

else: 
    z=open(Filename) 
    with z as f: 
     p = f.read() 

@app.route('/csv/') 
def download_csv(): 
    csv = p 
    response = make_response(csv) 
    cd = 'attachment; filename=RosterCurrentMonth.csv' 
    response.headers['Content-Disposition'] = cd 
    response.mimetype='text/csv' 

    return response 
z.close() 
os.remove(Filename) 
@app.route('/logout') 
def logout(): 
    # remove the username from the session if it's there 
    session.pop('username', None) 
    return redirect(url_for('login')) 
app.secret_key ='secret key generated' 
if __name__=='__main__': 
    context=('RosterWeb.crt','RosterWeb.key') 
    app.run(ssl_context=context, threaded=True, debug=True) 

は、エラーを取得：

Traceback (most recent call last): 
    File "roster.py", line 175, in <module> 
    x=session['username'] 
    File "C:\Users\dasa17\Envs\r_web\lib\site-packages\werkzeug\local.py", line 37 
3, in <lambda> 
    __getitem__ = lambda x, i: x._get_current_object()[i] 
    File "C:\Users\dasa17\Envs\r_web\lib\site-packages\werkzeug\local.py", line 30 
2, in _get_current_object 
    return self.__local() 
    File "C:\Users\dasa17\Envs\r_web\lib\site-packages\flask\globals.py", line 37, 
in _lookup_req_object 
    raise RuntimeError(_request_ctx_err_msg) 
RuntimeError: Working outside of request context. 

This typically means that you attempted to use functionality that needed 
an active HTTP request. Consult the documentation on testing for 
information about how to avoid this problem. 

Answer 1

あなたが任意のルーティングが機能して行われる前に実行したいコードを配置する必要があり、その上にbefore_first_request decoratorを使用してください。最初のリクエストが完了する前に実行され、そこからセッション変数を使用することができます。

@app.route('/') 
def index(): 
    # ... index route here ... 
    pass 

@app.before_first_request 
def init_app(): 
    # ... do some preparation here ... 
    session['username'] = 'me'