475 lines
14 KiB
Python
475 lines
14 KiB
Python
"""
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Miscellaneous utility functions, wrappers around some subprocess procedures.
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"""
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import concurrent.futures
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import fcntl
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import hashlib
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import importlib
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import inspect
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import json
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import logging
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import logging.config
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import os
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import random
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import shlex
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import shutil
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import sys
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import threading
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from pathlib import Path
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from subprocess import PIPE, STDOUT, Popen
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from typing import (
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TYPE_CHECKING,
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Any,
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Callable,
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Dict,
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Generic,
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Iterable,
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List,
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Optional,
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Tuple,
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Type,
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TypeVar,
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Union,
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)
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import netaddr
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from core.errors import CoreCommandError, CoreError
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logger = logging.getLogger(__name__)
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if TYPE_CHECKING:
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from core.emulator.coreemu import CoreEmu
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from core.emulator.session import Session
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from core.nodes.base import CoreNode
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T = TypeVar("T")
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DEVNULL = open(os.devnull, "wb")
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IFACE_CONFIG_FACTOR: int = 1000
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def execute_script(coreemu: "CoreEmu", file_path: Path, args: str) -> None:
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"""
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Provides utility function to execute a python script in context of the
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provide coreemu instance.
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:param coreemu: coreemu to provide to script
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:param file_path: python script to execute
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:param args: args to provide script
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:return: nothing
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"""
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sys.argv = shlex.split(args)
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thread = threading.Thread(
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target=execute_file, args=(file_path, {"coreemu": coreemu}), daemon=True
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)
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thread.start()
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thread.join()
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def execute_file(
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path: Path, exec_globals: Dict[str, str] = None, exec_locals: Dict[str, str] = None
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) -> None:
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"""
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Provides a way to execute a file.
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:param path: path of file to execute
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:param exec_globals: globals values to pass to execution
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:param exec_locals: local values to pass to execution
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:return: nothing
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"""
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if exec_globals is None:
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exec_globals = {}
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exec_globals.update({"__file__": str(path), "__name__": "__main__"})
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with path.open("rb") as f:
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data = compile(f.read(), path, "exec")
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exec(data, exec_globals, exec_locals)
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def hashkey(value: Union[str, int]) -> int:
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"""
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Provide a consistent hash that can be used in place
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of the builtin hash, that no longer behaves consistently
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in python3.
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:param value: value to hash
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:return: hash value
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"""
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if isinstance(value, int):
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value = str(value)
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value = value.encode("utf-8")
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return int(hashlib.sha256(value).hexdigest(), 16)
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def _detach_init() -> None:
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"""
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Fork a child process and exit.
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:return: nothing
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"""
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if os.fork():
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# parent exits
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os._exit(0)
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os.setsid()
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def _valid_module(path: Path) -> bool:
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"""
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Check if file is a valid python module.
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:param path: path to file
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:return: True if a valid python module file, False otherwise
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"""
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if not path.is_file():
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return False
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if path.name.startswith("_"):
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return False
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if not path.suffix == ".py":
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return False
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return True
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def _is_class(module: Any, member: Type, clazz: Type) -> bool:
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"""
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Validates if a module member is a class and an instance of a CoreService.
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:param module: module to validate for service
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:param member: member to validate for service
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:param clazz: clazz type to check for validation
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:return: True if a valid service, False otherwise
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"""
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if not inspect.isclass(member):
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return False
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if not issubclass(member, clazz):
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return False
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if member.__module__ != module.__name__:
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return False
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return True
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def close_onexec(fd: int) -> None:
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"""
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Close on execution of a shell process.
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:param fd: file descriptor to close
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:return: nothing
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"""
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fdflags = fcntl.fcntl(fd, fcntl.F_GETFD)
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fcntl.fcntl(fd, fcntl.F_SETFD, fdflags | fcntl.FD_CLOEXEC)
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def which(command: str, required: bool) -> str:
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"""
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Find location of desired executable within current PATH.
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:param command: command to find location for
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:param required: command is required to be found, false otherwise
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:return: command location or None
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:raises ValueError: when not found and required
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"""
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found_path = shutil.which(command)
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if found_path is None and required:
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raise CoreError(f"failed to find required executable({command}) in path")
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return found_path
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def make_tuple_fromstr(s: str, value_type: Callable[[str], T]) -> Tuple[T]:
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"""
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Create a tuple from a string.
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:param s: string to convert to a tuple
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:param value_type: type of values to be contained within tuple
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:return: tuple from string
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"""
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# remove tuple braces and strip commands and space from all values in the tuple
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# string
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values = []
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for x in s.strip("(), ").split(","):
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x = x.strip("' ")
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if x:
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values.append(x)
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return tuple(value_type(i) for i in values)
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def mute_detach(args: str, **kwargs: Dict[str, Any]) -> int:
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"""
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Run a muted detached process by forking it.
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:param args: arguments for the command
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:param kwargs: keyword arguments for the command
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:return: process id of the command
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"""
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args = shlex.split(args)
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kwargs["preexec_fn"] = _detach_init
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kwargs["stdout"] = DEVNULL
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kwargs["stderr"] = STDOUT
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return Popen(args, **kwargs).pid
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def cmd(
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args: str,
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env: Dict[str, str] = None,
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cwd: Path = None,
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wait: bool = True,
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shell: bool = False,
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) -> str:
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"""
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Execute a command on the host and return a tuple containing the exit status and
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result string. stderr output is folded into the stdout result string.
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:param args: command arguments
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:param env: environment to run command with
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:param cwd: directory to run command in
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:param wait: True to wait for status, False otherwise
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:param shell: True to use shell, False otherwise
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:return: combined stdout and stderr
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:raises CoreCommandError: when there is a non-zero exit status or the file to
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execute is not found
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"""
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logger.debug("command cwd(%s) wait(%s): %s", cwd, wait, args)
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if shell is False:
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args = shlex.split(args)
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try:
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output = PIPE if wait else DEVNULL
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p = Popen(args, stdout=output, stderr=output, env=env, cwd=cwd, shell=shell)
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if wait:
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stdout, stderr = p.communicate()
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stdout = stdout.decode("utf-8").strip()
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stderr = stderr.decode("utf-8").strip()
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status = p.wait()
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if status != 0:
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raise CoreCommandError(status, args, stdout, stderr)
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return stdout
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else:
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return ""
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except OSError as e:
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logger.error("cmd error: %s", e.strerror)
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raise CoreCommandError(1, args, "", e.strerror)
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def file_munge(pathname: str, header: str, text: str) -> None:
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"""
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Insert text at the end of a file, surrounded by header comments.
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:param pathname: file path to add text to
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:param header: header text comments
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:param text: text to append to file
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:return: nothing
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"""
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# prevent duplicates
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file_demunge(pathname, header)
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with open(pathname, "a") as append_file:
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append_file.write(f"# BEGIN {header}\n")
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append_file.write(text)
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append_file.write(f"# END {header}\n")
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def file_demunge(pathname: str, header: str) -> None:
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"""
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Remove text that was inserted in a file surrounded by header comments.
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:param pathname: file path to open for removing a header
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:param header: header text to target for removal
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:return: nothing
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"""
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with open(pathname, "r") as read_file:
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lines = read_file.readlines()
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start = None
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end = None
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for i, line in enumerate(lines):
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if line == f"# BEGIN {header}\n":
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start = i
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elif line == f"# END {header}\n":
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end = i + 1
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if start is None or end is None:
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return
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with open(pathname, "w") as write_file:
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lines = lines[:start] + lines[end:]
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write_file.write("".join(lines))
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def expand_corepath(
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pathname: str, session: "Session" = None, node: "CoreNode" = None
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) -> Path:
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"""
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Expand a file path given session information.
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:param pathname: file path to expand
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:param session: core session object to expand path
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:param node: node to expand path with
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:return: expanded path
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"""
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if session is not None:
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pathname = pathname.replace("~", f"/home/{session.user}")
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pathname = pathname.replace("%SESSION%", str(session.id))
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pathname = pathname.replace("%SESSION_DIR%", str(session.directory))
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pathname = pathname.replace("%SESSION_USER%", session.user)
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if node is not None:
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pathname = pathname.replace("%NODE%", str(node.id))
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pathname = pathname.replace("%NODENAME%", node.name)
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return Path(pathname)
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def sysctl_devname(devname: str) -> Optional[str]:
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"""
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Translate a device name to the name used with sysctl.
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:param devname: device name to translate
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:return: translated device name
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"""
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if devname is None:
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return None
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return devname.replace(".", "/")
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def load_config(file_path: Path, d: Dict[str, str]) -> None:
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"""
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Read key=value pairs from a file, into a dict. Skip comments; strip newline
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characters and spacing.
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:param file_path: file path to read data from
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:param d: dictionary to config into
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:return: nothing
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"""
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with file_path.open("r") as f:
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lines = f.readlines()
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for line in lines:
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if line[:1] == "#":
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continue
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try:
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key, value = line.split("=", 1)
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d[key] = value.strip()
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except ValueError:
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logger.exception("error reading file to dict: %s", file_path)
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def load_module(import_statement: str, clazz: Generic[T]) -> List[T]:
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classes = []
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try:
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module = importlib.import_module(import_statement)
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members = inspect.getmembers(module, lambda x: _is_class(module, x, clazz))
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for member in members:
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valid_class = member[1]
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classes.append(valid_class)
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except Exception:
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logger.exception(
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"unexpected error during import, skipping: %s", import_statement
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)
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return classes
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def load_classes(path: Path, clazz: Generic[T]) -> List[T]:
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"""
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Dynamically load classes for use within CORE.
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:param path: path to load classes from
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:param clazz: class type expected to be inherited from for loading
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:return: list of classes loaded
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"""
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# validate path exists
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logger.debug("attempting to load modules from path: %s", path)
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if not path.is_dir():
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logger.warning("invalid custom module directory specified" ": %s", path)
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# check if path is in sys.path
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parent = str(path.parent)
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if parent not in sys.path:
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logger.debug("adding parent path to allow imports: %s", parent)
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sys.path.append(parent)
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# import and add all service modules in the path
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classes = []
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for p in path.iterdir():
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if not _valid_module(p):
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continue
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import_statement = f"{path.name}.{p.stem}"
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logger.debug("importing custom module: %s", import_statement)
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loaded = load_module(import_statement, clazz)
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classes.extend(loaded)
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return classes
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def load_logging_config(config_path: Path) -> None:
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"""
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Load CORE logging configuration file.
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:param config_path: path to logging config file
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:return: nothing
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"""
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with config_path.open("r") as f:
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log_config = json.load(f)
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logging.config.dictConfig(log_config)
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def threadpool(
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funcs: List[Tuple[Callable, Iterable[Any], Dict[Any, Any]]], workers: int = 10
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) -> Tuple[List[Any], List[Exception]]:
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"""
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Run provided functions, arguments, and keywords within a threadpool
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collecting results and exceptions.
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:param funcs: iterable that provides a func, args, kwargs
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:param workers: number of workers for the threadpool
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:return: results and exceptions from running functions with args and kwargs
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"""
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with concurrent.futures.ThreadPoolExecutor(max_workers=workers) as executor:
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futures = []
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for func, args, kwargs in funcs:
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future = executor.submit(func, *args, **kwargs)
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futures.append(future)
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results = []
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exceptions = []
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for future in concurrent.futures.as_completed(futures):
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try:
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result = future.result()
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results.append(result)
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except Exception as e:
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logger.exception("thread pool exception")
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exceptions.append(e)
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return results, exceptions
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def random_mac() -> str:
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"""
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Create a random mac address using Xen OID 00:16:3E.
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:return: random mac address
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"""
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value = random.randint(0, 0xFFFFFF)
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value |= 0x00163E << 24
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mac = netaddr.EUI(value, dialect=netaddr.mac_unix_expanded)
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return str(mac)
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def iface_config_id(node_id: int, iface_id: int = None) -> int:
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"""
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Common utility to generate a configuration id, in case an interface is being
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targeted.
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:param node_id: node for config id
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:param iface_id: interface for config id
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:return: generated config id when interface is present, node id otherwise
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"""
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if iface_id is not None and iface_id >= 0:
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return node_id * IFACE_CONFIG_FACTOR + iface_id
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else:
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return node_id
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def parse_iface_config_id(config_id: int) -> Tuple[int, Optional[int]]:
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"""
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Parses configuration id, that may be potentially derived from an interface for a
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node.
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:param config_id: configuration id to parse
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:return:
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"""
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iface_id = None
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node_id = config_id
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if config_id >= IFACE_CONFIG_FACTOR:
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iface_id = config_id % IFACE_CONFIG_FACTOR
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node_id = config_id // IFACE_CONFIG_FACTOR
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return node_id, iface_id
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