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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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