443 lines
12 KiB
Python
443 lines
12 KiB
Python
"""
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Miscellaneous utility functions, wrappers around some subprocess procedures.
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"""
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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 logging
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import os
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import shlex
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import subprocess
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import sys
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from past.builtins import basestring
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from core import CoreCommandError
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DEVNULL = open(os.devnull, "wb")
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def execute_file(path, exec_globals=None, exec_locals=None):
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"""
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Provides an alternative way to run execfile to be compatible for
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both python2/3.
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:param str path: path of file to execute
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:param dict exec_globals: globals values to pass to execution
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:param dict 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({
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"__file__": path,
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"__name__": "__main__"
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})
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with open(path, "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):
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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 str/int value: value to hash
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:return: hash value
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:rtype: int
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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():
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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, file_name):
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"""
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Check if file is a valid python module.
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:param str path: path to file
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:param str file_name: file name to check
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:return: True if a valid python module file, False otherwise
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:rtype: bool
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"""
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file_path = os.path.join(path, file_name)
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if not os.path.isfile(file_path):
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return False
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if file_name.startswith("_"):
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return False
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if not file_name.endswith(".py"):
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return False
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return True
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def _is_class(module, member, clazz):
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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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:rtype: bool
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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 _is_exe(file_path):
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"""
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Check if a given file path exists and is an executable file.
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:param str file_path: file path to check
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:return: True if the file is considered and executable file, False otherwise
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:rtype: bool
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"""
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return os.path.isfile(file_path) and os.access(file_path, os.X_OK)
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def close_onexec(fd):
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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 check_executables(executables):
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"""
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Check executables, verify they exist and are executable.
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:param list[str] executables: executable to check
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:return: nothing
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:raises EnvironmentError: when an executable doesn't exist or is not executable
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"""
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for executable in executables:
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if not _is_exe(executable):
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raise EnvironmentError("executable not found: %s" % executable)
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def make_tuple(obj):
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"""
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Create a tuple from an object, or return the object itself.
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:param obj: object to convert to a tuple
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:return: converted tuple or the object itself
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:rtype: tuple
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"""
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if hasattr(obj, "__iter__"):
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return tuple(obj)
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else:
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return obj,
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def make_tuple_fromstr(s, value_type):
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"""
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Create a tuple from a string.
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:param str 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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:rtype: tuple
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"""
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# remove tuple braces and strip commands and space from all values in the tuple 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 split_args(args):
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"""
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Convenience method for splitting potential string commands into a shell-like syntax list.
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:param list/str args: command list or string
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:return: shell-like syntax list
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:rtype: list
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"""
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if isinstance(args, basestring):
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args = shlex.split(args)
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return args
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def mute_detach(args, **kwargs):
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"""
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Run a muted detached process by forking it.
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:param list[str]|str args: arguments for the command
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:param dict kwargs: keyword arguments for the command
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:return: process id of the command
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:rtype: int
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"""
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args = split_args(args)
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kwargs["preexec_fn"] = _detach_init
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kwargs["stdout"] = DEVNULL
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kwargs["stderr"] = subprocess.STDOUT
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return subprocess.Popen(args, **kwargs).pid
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def cmd(args, wait=True):
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"""
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Runs a command on and returns the exit status.
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:param list[str]|str args: command arguments
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:param bool wait: wait for command to end or not
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:return: command status
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:rtype: int
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"""
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args = split_args(args)
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logging.debug("command: %s", args)
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try:
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p = subprocess.Popen(args)
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if not wait:
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return 0
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return p.wait()
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except OSError:
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raise CoreCommandError(-1, args)
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def cmd_output(args):
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"""
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Execute a command on the host and return a tuple containing the exit status and result string. stderr output
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is folded into the stdout result string.
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:param list[str]|str args: command arguments
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:return: command status and stdout
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:rtype: tuple[int, str]
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:raises CoreCommandError: when the file to execute is not found
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"""
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args = split_args(args)
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logging.debug("command: %s", args)
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try:
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p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
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stdout, _ = p.communicate()
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status = p.wait()
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return status, stdout.decode("utf-8").strip()
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except OSError:
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raise CoreCommandError(-1, args)
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def check_cmd(args, **kwargs):
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"""
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Execute a command on the host and return a tuple containing the exit status and result string. stderr output
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is folded into the stdout result string.
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:param list[str]|str args: command arguments
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:param dict kwargs: keyword arguments to pass to subprocess.Popen
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:return: combined stdout and stderr
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:rtype: str
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:raises CoreCommandError: when there is a non-zero exit status or the file to execute is not found
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"""
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kwargs["stdout"] = subprocess.PIPE
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kwargs["stderr"] = subprocess.STDOUT
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args = split_args(args)
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logging.debug("command: %s", args)
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try:
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p = subprocess.Popen(args, **kwargs)
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stdout, _ = p.communicate()
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status = p.wait()
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if status != 0:
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raise CoreCommandError(status, args, stdout)
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return stdout.decode("utf-8").strip()
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except OSError:
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raise CoreCommandError(-1, args)
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def hex_dump(s, bytes_per_word=2, words_per_line=8):
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"""
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Hex dump of a string.
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:param str s: string to hex dump
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:param bytes_per_word: number of bytes per word
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:param words_per_line: number of words per line
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:return: hex dump of string
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"""
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dump = ""
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count = 0
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total_bytes = bytes_per_word * words_per_line
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while s:
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line = s[:total_bytes]
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s = s[total_bytes:]
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tmp = map(lambda x: ("%02x" * bytes_per_word) % x, zip(*[iter(map(ord, line))] * bytes_per_word))
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if len(line) % 2:
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tmp.append("%x" % ord(line[-1]))
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dump += "0x%08x: %s\n" % (count, " ".join(tmp))
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count += len(line)
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return dump[:-1]
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def file_munge(pathname, header, text):
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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 str pathname: file path to add text to
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:param str header: header text comments
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:param str 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("# BEGIN %s\n" % header)
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append_file.write(text)
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append_file.write("# END %s\n" % header)
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def file_demunge(pathname, header):
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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 str pathname: file path to open for removing a header
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:param str 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 == "# BEGIN %s\n" % header:
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start = i
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elif line == "# END %s\n" % header:
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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(pathname, session=None, node=None):
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"""
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Expand a file path given session information.
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:param str pathname: file path to expand
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:param core.emulator.session.Session session: core session object to expand path with
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:param core.nodes.base.CoreNode node: node to expand path with
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:return: expanded path
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:rtype: str
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"""
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if session is not None:
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pathname = pathname.replace("~", "/home/%s" % session.user)
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pathname = pathname.replace("%SESSION%", str(session.id))
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pathname = pathname.replace("%SESSION_DIR%", session.session_dir)
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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 pathname
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def sysctl_devname(devname):
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"""
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Translate a device name to the name used with sysctl.
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:param str devname: device name to translate
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:return: translated device name
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:rtype: str
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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(filename, d):
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"""
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Read key=value pairs from a file, into a dict. Skip comments; strip newline characters and spacing.
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:param str filename: file to read into a dictionary
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:param dict d: dictionary to read file into
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:return: nothing
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"""
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with open(filename, "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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logging.exception("error reading file to dict: %s", filename)
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def load_classes(path, clazz):
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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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logging.debug("attempting to load modules from path: %s", path)
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if not os.path.isdir(path):
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logging.warning("invalid custom module directory specified" ": %s" % path)
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# check if path is in sys.path
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parent_path = os.path.dirname(path)
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if parent_path not in sys.path:
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logging.debug("adding parent path to allow imports: %s", parent_path)
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sys.path.append(parent_path)
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# retrieve potential service modules, and filter out invalid modules
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base_module = os.path.basename(path)
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module_names = os.listdir(path)
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module_names = filter(lambda x: _valid_module(path, x), module_names)
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module_names = map(lambda x: x[:-3], module_names)
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# import and add all service modules in the path
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classes = []
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for module_name in module_names:
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import_statement = "%s.%s" % (base_module, module_name)
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logging.debug("importing custom module: %s", import_statement)
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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:
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logging.exception("unexpected error during import, skipping: %s", import_statement)
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return classes
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