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Current File : /opt/imunify360/venv/lib/python3.11/site-packages/defence360agent/utils/resource_limits.py
import asyncio
import logging

from enum import Enum
from os import fsdecode
from pathlib import Path
from typing import List

from defence360agent.utils import OsReleaseInfo

logger = logging.getLogger(__name__)


RUN_WITH_INTENSITY = "/usr/libexec/run-with-intensity"

LVECTL_BIN_PATH = Path("/usr/sbin/lvectl")
PROC_LVE_LIST_PATH = Path("/proc/lve/list")


class LimitsMethod(Enum):
    NICE = "nice"
    LVE = "lve"
    CGROUPS = "cgroups"


async def get_current_method() -> LimitsMethod:
    """Returns limit method, used in run-with-intensity tool."""
    proc = await asyncio.create_subprocess_exec(
        RUN_WITH_INTENSITY,
        "show",
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
    )

    stdout, stderr = await proc.communicate()
    stdout = fsdecode(stdout).strip()

    if stdout == "nice":
        return LimitsMethod.NICE
    if stdout == "lve":
        return LimitsMethod.LVE
    if stdout == "cgroups":
        return LimitsMethod.CGROUPS
    raise LookupError(
        "Parsing of used limitation method failed\nstdout: {}\nstderr: {}"
        .format(stdout, fsdecode(stderr).strip())
    )


async def create_subprocess(
    cmd: List[str],
    key: str,
    intensity_cpu: int,
    intensity_io: int,
    **subprocess_kwargs
) -> asyncio.subprocess.Process:
    """
    Creates asyncio.Process with limited resources (cpu & io),
    using run-with-intensity tool.

    :param cmd: command to execute
    :param intensity_cpu: cpu intensity limit
    :param intensity_io: io intensity limit
    :param subprocess_kwargs: keyword arguments for create_subprocess_exec func
    :return: executed Process
    """
    limits_cmd = [
        RUN_WITH_INTENSITY,
        "run",
        "--intensity-cpu",
        str(intensity_cpu),
        "--intensity-io",
        str(intensity_io),
    ]
    limits_cmd.extend(["--key", key])

    return await asyncio.create_subprocess_exec(
        *(limits_cmd + cmd), **subprocess_kwargs
    )


def is_lve_active() -> bool:
    """Checks that LVE-utils is active resource limiter."""
    # to avoid possible errors such as DEF-11941
    # make sure that OS is CL
    return PROC_LVE_LIST_PATH.exists() and OsReleaseInfo.is_cloudlinux()


def has_lvectl() -> bool:
    """Checks that LVE-utils is installed."""
    return LVECTL_BIN_PATH.exists()

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