Django wait for database

import time
import sys

from django.db import OperationalError, connections

def write(message):
    sys.stderr.write(message)
    sys.stderr.flush()

def database_ready(database: str = "default", maximum_wait: int = 15) -> bool:
    write("waiting for database...")
    connected, start = False, time.time()
    while not connected and time.time() - start < maximum_wait:
        try:
            connections[database].cursor().execute("SELECT 1")
            connected = True
        except OperationalError:
            write("waiting for database...")
            time.sleep(maximum_wait // 3)
    if time.time() - start > maximum_wait:
        raise OperationalError("Could not connect to database.")
    return connected

# myproject/wsgi.py & asgi.py
"""
Wait for the default database to be ready before loading the application
"""
import os

from django.core.wsgi import get_wsgi_application

import utils

os.environ.setdefault("DJANGO_SETTINGS_MODULE", "myproject.settings")
utils.database_ready("default", maximum_wait=15)

application = get_wsgi_application()

# myproject/management/commands/migrate.py
"""
Wait for the default database to bre ready before running migrations
"""
from django.core.management.commands.migrate import Command

from corrdyn_creds import utils

class Command(Command):
    def handle(self, *args, **options):
        utils.database_ready("default", maximum_wait=15)
        super().handle(*args, **options)

Similar codes

12 votes129 views6 answers
Curl in python
Python
0 vote205 views1 answer
Annot identify image file '/home/ellis/CB/Django-Ecommerce/media_root/default.jpg'
Python Django
1 vote132 views1 answer
Pandas find median of non zero values in a column
Python
1 vote126 views1 answer
Django loop index
Python
0 vote128 views1 answer
How to make a dashboard with data representation using python free dash
Python
-1 vote118 views2 answers
Microsoft visual c++ 14.0 is required
Python
0 vote128 views1 answer
How to get rid of all null values in array python
Python
3 votes122 views1 answer
Python store save data
Python
0 vote123 views1 answer
Selenium save webpage as pdf python
Python
0 vote169 views2 answers
Icpc preliminary 2018 problem
Python