KOKINIO - MANAGER

Edit File: isolatectl

#!/opt/cloudlinux/venv/bin/python3 -bb
# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2026 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT
#
# isolatectl — unified end-user utility for per-domain resource limits
# and website isolation management.  JSON-only output.
#
# Subcommand groups:
#   isolatectl limits {list,set,apply}         — per-domain (LVD) resource limits
#   isolatectl site-isolation {enable,disable,list} — website isolation (CageFS)

import argparse
import json
import logging
import os
import subprocess
import sys

from clcommon.clpwd import ClPwd

from websiteisolation.commands import cmd_apply, cmd_list, cmd_set, cmd_stats
from websiteisolation.exceptions import ErrorCode, LvdError

VERSION = '1.0.0'

CAGEFSCTL_USER_BIN = '/usr/sbin/cagefsctl-user'

# Matches lveinfo's and cloudlinux-statistics' own default, so `isolatectl stats`
# with no arguments answers the same question its siblings do. It is also about
# as close to live as this data gets: rows are written when an aggregation period
# finalises, so anything narrower risks a window with no completed measurement in
# it.
DEFAULT_STATS_PERIOD = '10m'

def _setup_logging():
    log_dir = os.path.join(ClPwd(min_uid=0).get_pw_by_uid(os.getuid())[0].pw_dir, '.lve')
    log_path = os.path.join(log_dir, 'isolatectl.log')
    logger = logging.getLogger('websiteisolation')
    logger.setLevel(logging.DEBUG)
    logger.propagate = False

fmt = logging.Formatter('[%(levelname)s | %(asctime)s]: %(message)s')

os.makedirs(log_dir, mode=0o700, exist_ok=True)
    fh = logging.FileHandler(log_path)
    fh.setLevel(logging.DEBUG)
    fh.setFormatter(fmt)
    logger.addHandler(fh)

def _output(data):
    """Print JSON response to stdout."""
    print(json.dumps(data, indent=2))

def _error(message, code=ErrorCode.INTERNAL_ERROR, exit_code=1):
    """Print JSON error to stdout and exit.

*code* is one of ErrorCode: the stable value callers branch on, where
    *message* is for people (CLOS-7520).
    """
    _output({'result': 'error', 'code': code, 'message': str(message)})
    sys.exit(exit_code)

class _JsonArgumentParser(argparse.ArgumentParser):
    """Report a usage error as a JSON error, like every other failure."""

def error(self, message):
        _error(message, code=ErrorCode.INVALID_VALUE)

# ── limits helpers ────────────────────────────────────────────────

def _add_domain_arg(parser, required=True):
    parser.add_argument('--domain', required=required, metavar='NAME',
                        help='domain name')

def _add_limit_args(parser):
    parser.add_argument('--cpu', type=int, metavar='VAL',
                        help='CPU limit (hundredths of percent, 2500 = 25%%)')
    parser.add_argument('--pmem', type=int, metavar='VAL',
                        help='physical memory limit (bytes)')
    parser.add_argument('--io', type=int, metavar='VAL',
                        help='I/O limit (KB/s)')
    parser.add_argument('--nproc', type=int, metavar='VAL',
                        help='max processes')
    parser.add_argument('--iops', type=int, metavar='VAL',
                        help='I/O operations per second')
    parser.add_argument('--ep', type=int, metavar='VAL',
                        help='max entry processes (concurrent connections)')
    parser.add_argument('--vmem', type=int, metavar='VAL',
                        help='virtual memory limit (bytes)')

def _collect_limits(args):
    limits = {}
    for field in ('cpu', 'pmem', 'io', 'nproc', 'iops', 'ep', 'vmem'):
        val = getattr(args, field, None)
        if val is not None:
            limits[field] = val
    return limits

def handle_limits_list(args):
    return cmd_list(lve_id=os.geteuid(), domain=args.domain)

def handle_limits_set(args):
    limits = _collect_limits(args)
    if not limits:
        _error("at least one limit (--cpu, --pmem, --io, --nproc, --iops, --ep, --vmem) required",
               code=ErrorCode.INVALID_VALUE)
    for field, val in limits.items():
        if val < 0:
            _error(f"limit --{field} must be non-negative (got {val})",
                   code=ErrorCode.INVALID_VALUE)
    return cmd_set(os.geteuid(), args.domain, limits)

def handle_limits_apply(args):
    return cmd_apply(os.geteuid(), args.domain)

# ── stats helpers ─────────────────────────────────────────────────

def handle_stats(args):
    return cmd_stats(lve_id=os.geteuid(), domain=args.domain,
                     period=args.period)

# ── site-isolation helpers ────────────────────────────────────────

def _run_cagefsctl_user(subcmd, extra_args=None):
    """Delegate to cagefsctl-user and pass through its JSON output."""
    argv = [CAGEFSCTL_USER_BIN, 'site-isolation-' + subcmd]
    if extra_args:
        argv.extend(extra_args)

try:
        proc = subprocess.run(
            argv, capture_output=True, text=True, check=False,
        )
    except OSError as e:
        _error(f"failed to run {CAGEFSCTL_USER_BIN}: {e}",
               code=ErrorCode.BACKEND_UNAVAILABLE)

parsed = None
    if proc.stdout.strip():
        try:
            parsed = json.loads(proc.stdout)
        except (json.JSONDecodeError, ValueError):
            pass

if proc.returncode != 0:
        if parsed is not None:
            # cagefsctl-user's own response, with its own stable `code`.
            _output(parsed)
            sys.exit(proc.returncode)
        stderr = proc.stderr.strip()
        _error(f"cagefsctl-user site-isolation-{subcmd} failed "
               f"(exit {proc.returncode}): {stderr}",
               code=ErrorCode.BACKEND_UNAVAILABLE)

if parsed is not None:
        return parsed

_error('no output from cagefsctl-user', code=ErrorCode.BACKEND_UNAVAILABLE)

def handle_site_isolation_enable(args):
    return _run_cagefsctl_user('enable', ['--domain', args.domain])

def handle_site_isolation_disable(args):
    return _run_cagefsctl_user('disable', ['--domain', args.domain])

def handle_site_isolation_list(args):
    return _run_cagefsctl_user('list')

# ── parser ────────────────────────────────────────────────────────

def build_parser():
    # Subparsers inherit the parser class, so every level reports usage
    # errors as JSON.
    parser = _JsonArgumentParser(
        prog='isolatectl',
        description='Unified utility for per-domain resource limits and '
                    'website isolation management. JSON-only output.\n\n'
                    'Note: domain limits require site isolation to be '
                    'enabled first (isolatectl site-isolation enable).',
        formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument('--version', action='version',
                        version=json.dumps({'version': VERSION}))

groups = parser.add_subparsers(dest='group', metavar='command')

# ── limits ────────────────────────────────────────────────────
    limits_parser = groups.add_parser(
        'limits',
        help='manage per-domain (LVD) resource limits')
    limits_sub = limits_parser.add_subparsers(dest='subcommand', metavar='subcommand')

p = limits_sub.add_parser('list', help='show limits for all domains or a specific domain')
    _add_domain_arg(p, required=False)
    p.set_defaults(func=handle_limits_list)

p = limits_sub.add_parser(
        'set', help='store per-domain limits and apply them to kernel',
        epilog='Example:\n'
               '  isolatectl limits set --domain example.com --cpu 5000 --pmem 268435456 --io 2048 --nproc 30 --iops 500 --ep 20 --vmem 536870912\n'
               '\n'
               'This sets: CPU 50%%, 256 MB PMEM, 2048 KB/s IO, 30 procs, 500 IOPS, 20 entry procs, 512 MB VMEM.\n'
               'Use PYLVE_DEBUG=1 for verbose helper output.',
        formatter_class=argparse.RawDescriptionHelpFormatter)
    _add_domain_arg(p)
    _add_limit_args(p)
    p.set_defaults(func=handle_limits_set)

p = limits_sub.add_parser('apply', help="push one domain's limits from config to kernel")
    _add_domain_arg(p)
    p.set_defaults(func=handle_limits_apply)

# ── site-isolation ────────────────────────────────────────────
    si_parser = groups.add_parser(
        'site-isolation',
        help='manage website isolation (CageFS)')
    si_sub = si_parser.add_subparsers(dest='subcommand', metavar='subcommand')

p = si_sub.add_parser('enable', help='enable site isolation for domain(s)')
    p.add_argument('--domain', required=True,
                   help='domain name(s) to enable site isolation for (comma-separated)')
    p.set_defaults(func=handle_site_isolation_enable)

p = si_sub.add_parser('disable', help='disable site isolation for domain(s)')
    p.add_argument('--domain', required=True,
                   help='domain name(s) to disable site isolation for (comma-separated)')
    p.set_defaults(func=handle_site_isolation_disable)

p = si_sub.add_parser('list', help='list domains with site isolation enabled')
    p.set_defaults(func=handle_site_isolation_list)

# ── stats ─────────────────────────────────────────────────────
    # A command in its own right rather than "limits stats": it reports usage,
    # not configuration, and reads a different source.
    stats_parser = groups.add_parser(
        'stats',
        help="show resource usage for this account's isolated domains",
        epilog='Examples:\n'
               '  isolatectl stats\n'
               '  isolatectl stats --period 1d\n'
               '  isolatectl stats --domain example.com --period today\n'
               '\n'
               'Only domains that were active during the period are recorded, so a\n'
               'quiet website is absent from the output rather than listed as zero.\n'
               'The period grammar is lveinfo\'s: d, h, m, s — "1m" is one minute,\n'
               'not one month; a month is "30d".',
        formatter_class=argparse.RawDescriptionHelpFormatter)
    _add_domain_arg(stats_parser, required=False)
    stats_parser.add_argument(
        '--period', default=DEFAULT_STATS_PERIOD, metavar='PERIOD',
        help=f'time window to report over (default: {DEFAULT_STATS_PERIOD}), '
             'e.g. 60s, 10m, 1h, today, 1d, 30d')
    stats_parser.set_defaults(func=handle_stats)

return parser

def main():
    if os.getuid() == 0:
        _error("isolatectl must not be run as root; run as a regular user",
               code=ErrorCode.NOT_ALLOWED)

_setup_logging()
    # Under 'websiteisolation', so it reaches isolatectl.log: a logger with no
    # handler of its own falls back to stderr and doubled every error there.
    log = logging.getLogger('websiteisolation.isolatectl')
    log.debug('Executing "%s"', ' '.join(sys.argv))

is_debug = int(os.environ.get('PYLVE_DEBUG', 0))
    if is_debug:
        print(f"DEBUG [isolatectl]: uid={os.getuid()} argv={sys.argv}",
              file=sys.stderr)

parser = build_parser()
    args = parser.parse_args()

if not args.group:
        parser.print_help()
        sys.exit(1)

if not hasattr(args, 'func'):
        # Group given but no subcommand
        if args.group == 'limits':
            parser.parse_args(['limits', '--help'])
        elif args.group == 'site-isolation':
            parser.parse_args(['site-isolation', '--help'])
        sys.exit(1)

try:
        result = args.func(args)
        _output(result)
    except LvdError as e:
        log.error('%s', e)
        _error(str(e), code=e.code)
    except Exception as e:
        log.exception('unexpected error')
        _error(f"unexpected error: {e}", code=ErrorCode.INTERNAL_ERROR)

if __name__ == '__main__':
    main()