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# -*- coding: utf-8 -*-
"""
reset_db command
originally from https://www.djangosnippets.org/snippets/828/ by dnordberg
"""
import importlib.util
import os
import logging
import warnings
from django.conf import settings
from django.core.management.base import BaseCommand, CommandError
from django.db import DEFAULT_DB_ALIAS
from django_extensions.settings import SQLITE_ENGINES, POSTGRESQL_ENGINES, MYSQL_ENGINES
from django_extensions.management.mysql import parse_mysql_cnf
from django_extensions.management.utils import signalcommand
from django_extensions.utils.deprecation import RemovedInNextVersionWarning
class Command(BaseCommand):
help = "Resets the database for this project."
def add_arguments(self, parser):
super().add_arguments(parser)
parser.add_argument(
"--noinput",
"--no-input",
action="store_false",
dest="interactive",
default=True,
help="Tells Django to NOT prompt the user for input of any kind.",
)
parser.add_argument(
"--no-utf8",
action="store_true",
dest="no_utf8_support",
default=False,
help="Tells Django to not create a UTF-8 charset database",
)
parser.add_argument(
"-U",
"--user",
action="store",
dest="user",
default=None,
help="Use another user for the database than defined in settings.py",
)
parser.add_argument(
"-O",
"--owner",
action="store",
dest="owner",
default=None,
help="Use another owner for creating the database than the user defined "
"in settings or via --user",
)
parser.add_argument(
"-P",
"--password",
action="store",
dest="password",
default=None,
help="Use another password for the database than defined in settings.py",
)
parser.add_argument(
"-D",
"--dbname",
action="store",
dest="dbname",
default=None,
help="Use another database name than defined in settings.py",
)
parser.add_argument(
"-R",
"--router",
action="store",
dest="router",
default=DEFAULT_DB_ALIAS,
help="Use this router-database other than defined in settings.py",
)
parser.add_argument(
"--database",
default=DEFAULT_DB_ALIAS,
help='Nominates a database to run command for. Defaults to the "%s".'
% DEFAULT_DB_ALIAS,
)
parser.add_argument(
"-c",
"--close-sessions",
action="store_true",
dest="close_sessions",
default=False,
help="Close database connections before dropping database "
"(currently works on PostgreSQL only)",
)
@signalcommand
def handle(self, *args, **options):
"""
Reset the database for this project.
Note: Transaction wrappers are in reverse as a work around for
autocommit, anybody know how to do this the right way?
"""
database = options["database"]
if options["router"] != DEFAULT_DB_ALIAS:
warnings.warn(
"--router is deprecated. You should use --database.",
RemovedInNextVersionWarning,
stacklevel=2,
)
database = options["router"]
dbinfo = settings.DATABASES.get(database)
if dbinfo is None:
raise CommandError("Unknown database %s" % database)
engine = dbinfo.get("ENGINE")
user = password = database_name = database_host = database_port = ""
if engine == "mysql":
(user, password, database_name, database_host, database_port) = (
parse_mysql_cnf(dbinfo)
)
user = options["user"] or dbinfo.get("USER") or user
password = options["password"] or dbinfo.get("PASSWORD") or password
owner = options["owner"] or user
database_name = options["dbname"] or dbinfo.get("NAME") or database_name
if database_name == "":
raise CommandError(
"You need to specify DATABASE_NAME in your Django settings file."
)
database_host = dbinfo.get("HOST") or database_host
database_port = dbinfo.get("PORT") or database_port
verbosity = options["verbosity"]
if options["interactive"]:
confirm = input(
"""
You have requested a database reset.
This will IRREVERSIBLY DESTROY
ALL data in the database "%s".
Are you sure you want to do this?
Type 'yes' to continue, or 'no' to cancel: """
% (database_name,)
)
else:
confirm = "yes"
if confirm != "yes":
print("Reset cancelled.")
return
if engine in SQLITE_ENGINES:
try:
logging.info("Unlinking %s database", engine)
os.unlink(database_name)
except OSError:
pass
elif engine in MYSQL_ENGINES:
import MySQLdb as Database
kwargs = {
"user": user,
"passwd": password,
}
if database_host.startswith("/"):
kwargs["unix_socket"] = database_host
else:
kwargs["host"] = database_host
if database_port:
kwargs["port"] = int(database_port)
connection = Database.connect(**kwargs)
drop_query = "DROP DATABASE IF EXISTS `%s`" % database_name
utf8_support = "" if options["no_utf8_support"] else "CHARACTER SET utf8"
create_query = "CREATE DATABASE `%s` %s" % (database_name, utf8_support)
logging.info('Executing... "%s"', drop_query)
connection.query(drop_query)
logging.info('Executing... "%s"', create_query)
connection.query(create_query.strip())
elif engine in POSTGRESQL_ENGINES:
has_psycopg3 = importlib.util.find_spec("psycopg")
if has_psycopg3:
import psycopg as Database # NOQA
else:
import psycopg2 as Database # NOQA
conn_params = {"dbname": "template1"}
if user:
conn_params["user"] = user
if password:
conn_params["password"] = password
if database_host:
conn_params["host"] = database_host
if database_port:
conn_params["port"] = database_port
connection = Database.connect(**conn_params)
if has_psycopg3:
connection.autocommit = True
else:
connection.set_isolation_level(0) # autocommit false
cursor = connection.cursor()
if options["close_sessions"]:
close_sessions_query = (
"""
SELECT pg_terminate_backend(pg_stat_activity.pid)
FROM pg_stat_activity
WHERE pg_stat_activity.datname = '%s';
"""
% database_name
)
logging.info('Executing... "%s"', close_sessions_query.strip())
try:
cursor.execute(close_sessions_query)
except Database.ProgrammingError as e:
logging.exception("Error: %s", str(e))
drop_query = 'DROP DATABASE "%s";' % database_name
logging.info('Executing... "%s"', drop_query)
try:
cursor.execute(drop_query)
except Database.ProgrammingError as e:
logging.exception("Error: %s", str(e))
create_query = 'CREATE DATABASE "%s"' % database_name
if owner:
create_query += ' WITH OWNER = "%s" ' % owner
create_query += " ENCODING = 'UTF8'"
if settings.DEFAULT_TABLESPACE:
create_query += " TABLESPACE = %s;" % settings.DEFAULT_TABLESPACE
else:
create_query += ";"
logging.info('Executing... "%s"', create_query)
cursor.execute(create_query)
else:
raise CommandError("Unknown database engine %s" % engine)
if verbosity >= 2 or options["interactive"]:
print("Reset successful.")
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