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

3 votes260 views1 answer
Access the value in settings django
Python Django
14 votes221 views6 answers
Installing django on windows
Python Django
1 vote223 views1 answer
Permanent redirect django
Python Django
2 votes260 views1 answer
Database default code in settings django
Python Django
0 vote223 views3 answers
Django custom authentication
Python Django
0 vote209 views1 answer
Django form is onvalid
Python Django
2 votes285 views1 answer
Django try catch exception
Python Django
1 vote249 views2 answers
Django sum get 0 if none
Python Django
2 votes261 views1 answer
Django create model from dictionary
Python Django
4 votes240 views1 answer
Django is null
Python Django