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| Dir : //proc/self/root/opt/sharedrads/mass_mysql_recover.py |
#!/opt/imh-python/bin/python3
"""Shared server mass MySQL recovery tool"""
from collections.abc import Iterator
import sys
import os
import argparse
from pathlib import PosixPath
from concurrent.futures import ThreadPoolExecutor, as_completed
import subprocess
from cproc import ProcLimit
import rads
from bakauth import BakAuth
from restic import Restic, ResticError, SQLBackupGroup, SQLBackupItem
def parse_args() -> argparse.Namespace:
"""Parse CLI args"""
parser = argparse.ArgumentParser(description=__doc__)
default_load = float(os.cpu_count())
parser.add_argument(
'--workers',
type=int,
default=12,
help='How many databases to download in parallel (default: 12)',
)
subparsers = parser.add_subparsers(
title='command', dest='command', required=True
)
add_cmd = lambda cmd, msg: subparsers.add_parser(
cmd, description=msg, help=msg
)
down = add_cmd('download', 'Download MySQL data from backups')
down.add_argument(
'--max-load',
metavar='FLOAT',
dest='lim',
type=lambda x: ProcLimit(x, grace=(5, 1)),
default=ProcLimit(default_load, grace=(5, 1)),
help='Max server load before pausing restic subprocesses '
f'(default: {default_load})',
)
down.add_argument(
'--userlist',
metavar='FILE',
type=lambda x: PosixPath(x).resolve(),
help='Only search in restic repos owned by users found in this '
'line-delimited file',
)
down.add_argument(
'--dblist',
metavar='FILE',
type=lambda x: PosixPath(x).resolve(),
help='Only download databases found that match the names found in this '
'line-delimited file',
)
dest = down.add_mutually_exclusive_group(required=True)
dest.add_argument(
'--path',
type=lambda x: PosixPath(x).resolve(),
help='Path to download sql dumps to',
)
dest.add_argument(
'--import-now',
dest='import_now',
action='store_true',
help='Instead of downloading to the disk, immediately import',
)
imp = add_cmd('import', 'Import downloaded database dumps')
imp.add_argument(
'path',
type=lambda x: PosixPath(x).resolve(),
help='Path to import sql dumps from',
)
args = parser.parse_args()
return args
def main():
"""Main program logic"""
args = parse_args()
if args.command == 'import':
import_main(args)
elif args.command == 'download':
download_main(args)
else:
raise RuntimeError
print('done.')
class Pool(ThreadPoolExecutor):
"""ThreadPoolExecutor subclass that automatically runs .result() on
each future it creates on __exit__"""
def __init__(self, max_workers: int):
super().__init__(max_workers=max_workers)
self.tasks = []
def submit(self, func, /, *args, **kwargs):
future = super().submit(func, *args, **kwargs)
self.tasks.append(future)
return future
def __exit__(self, exc_type, exc_val, exc_tb):
for future in as_completed(self.tasks):
try:
future.result()
except Exception as exc: # pylint: disable=broad-except
print('ERROR:', exc, file=sys.stderr)
return super().__exit__(exc_type, exc_val, exc_tb)
def download_main(args: argparse.Namespace):
"""Mass-downloads mysql data from restic"""
if args.import_now:
print('This will immediately import each MySQL database found without ')
print('dumping the original first.')
if not rads.prompt_y_n('Continue?'):
sys.exit(2)
else:
print('Downloading to', args.path)
if args.dblist is not None:
with args.dblist.open() as handle:
args.dblist = handle.read().splitlines()
if args.userlist is not None:
with args.userlist.open() as handle:
args.userlist = handle.read().splitlines()
api = BakAuth()
is_reseller = api.get_reg_details()['svr_class'] == 'imh_reseller'
with Pool(max_workers=args.workers) as pool:
for bucket_user, restic in api.all_restics(
users=args.userlist, lim=args.lim
).items():
for backup in find_backups(restic, bucket_user, is_reseller):
# this iterates once per user, finding the latest backup
# which may contain multiple databases
for dbname, snap in backup.dbs.items():
if args.dblist is not None and dbname not in args.dblist:
continue
if args.import_now:
pool.submit(download_import, snap)
continue
pool.submit(download_to_disk, snap, args.path)
def import_main(args: argparse.Namespace):
"""Mass imports MySQL data from a directory"""
print('MySQL data will be imported as root. This should only be used for ')
print('data downloaded by this tool, never customer-provided .sql files.')
if not rads.prompt_y_n('Continue?'):
sys.exit(2)
with Pool(max_workers=args.workers) as pool:
for sql in args.path.glob('*/*.sql'):
pool.submit(import_db, sql)
def find_backups(
restic: Restic, bucket_user: str, is_reseller: bool
) -> Iterator[SQLBackupGroup]:
"""Find the latest MySQL backups in a restic repo
Args:
restic (Restic): restic instance to look through
bucket_user (str): username for the main cPanel user this restic repo
belongs to
Yields:
SQLBackupGroup: latest SQLBackupGroup for each user
"""
if bucket_user == 'root':
return
if is_reseller:
users = rads.get_children(bucket_user) + [bucket_user]
else:
users = [bucket_user]
try:
backups = restic.get_backups(serialize=False)
except ResticError as exc:
print('ERROR:', restic, exc, sep=': ', file=sys.stderr)
for user in users:
try:
backup = sorted(backups[user]['mysql'], key=lambda x: x.time)[-1]
except (IndexError, KeyError):
print('SKIPPED:', user, 'had no MySQL backups', file=sys.stderr)
continue
yield backup
def download_import(snap: SQLBackupItem):
"""Downloads and immediately imports a database from restic"""
print('DOWNLOAD+IMPORT:', snap.dbname)
with snap.dump().proc(stdout=subprocess.PIPE) as proc:
subprocess.run(['mysql', snap.dbname], stdin=proc.stdout, check=True)
down_stderr = proc.stderr.read()
if proc.returncode:
raise ResticError(
subprocess.CompletedProcess(
args=proc.args,
returncode=proc.returncode,
stdout=None,
stderr=down_stderr,
)
)
def download_to_disk(snap: SQLBackupItem, root_path: PosixPath):
"""Downloads a MySQL database from a restic repo, saves to the disk
Args:
snap (SQLBackupItem): SQL snapshot to download from
path (PosixPath): path to download to
Raises:
ResticError: any error raised by restic
"""
# dump_dest = ${args.path}/${username}/${dbname}.sql
dump_dest = root_path.joinpath(snap.user).joinpath(f'{snap.dbname}.sql')
try:
if dump_dest.stat().st_size > 0:
print('EXISTS:', dump_dest)
return
except FileNotFoundError:
pass
print('DOWNLOADING:', dump_dest)
os.makedirs(dump_dest.parent, exist_ok=True)
with dump_dest.open('w') as handle:
try:
snap.dump().run(stdout=handle, check=True)
except subprocess.CalledProcessError as exc:
raise ResticError(exc) from exc
def import_db(path: PosixPath):
"""Imports a database dump"""
print('IMPORTING:', path)
with path.open() as handle:
dbname = path.name.removesuffix('.sql')
subprocess.run(['mysql', dbname], stdin=handle, check=True)
if __name__ == '__main__':
main()