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