158 lines
4.2 KiB
Python
158 lines
4.2 KiB
Python
# SPDX-License-Identifier: GPL-2.0
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import errno
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import json as _json
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import os
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import random
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import re
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import select
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import socket
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import subprocess
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import time
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class CmdExitFailure(Exception):
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pass
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def fd_read_timeout(fd, timeout):
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rlist, _, _ = select.select([fd], [], [], timeout)
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if rlist:
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return os.read(fd, 1024)
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else:
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raise TimeoutError("Timeout waiting for fd read")
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class cmd:
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def __init__(self, comm, shell=True, fail=True, ns=None, background=False, host=None, timeout=5):
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if ns:
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comm = f'ip netns exec {ns} ' + comm
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self.stdout = None
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self.stderr = None
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self.ret = None
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self.comm = comm
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if host:
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self.proc = host.cmd(comm)
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else:
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self.proc = subprocess.Popen(comm, shell=shell, stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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if not background:
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self.process(terminate=False, fail=fail, timeout=timeout)
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def process(self, terminate=True, fail=None, timeout=5):
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if fail is None:
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fail = not terminate
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if terminate:
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self.proc.terminate()
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stdout, stderr = self.proc.communicate(timeout)
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self.stdout = stdout.decode("utf-8")
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self.stderr = stderr.decode("utf-8")
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self.proc.stdout.close()
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self.proc.stderr.close()
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self.ret = self.proc.returncode
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if self.proc.returncode != 0 and fail:
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if len(stderr) > 0 and stderr[-1] == "\n":
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stderr = stderr[:-1]
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raise CmdExitFailure("Command failed: %s\nSTDOUT: %s\nSTDERR: %s" %
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(self.proc.args, stdout, stderr))
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class bkg(cmd):
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def __init__(self, comm, shell=True, fail=None, ns=None, host=None,
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exit_wait=False):
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super().__init__(comm, background=True,
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shell=shell, fail=fail, ns=ns, host=host)
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self.terminate = not exit_wait
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self.check_fail = fail
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def __enter__(self):
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return self
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def __exit__(self, ex_type, ex_value, ex_tb):
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return self.process(terminate=self.terminate, fail=self.check_fail)
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global_defer_queue = []
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class defer:
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def __init__(self, func, *args, **kwargs):
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global global_defer_queue
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if not callable(func):
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raise Exception("defer created with un-callable object, did you call the function instead of passing its name?")
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self.func = func
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self.args = args
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self.kwargs = kwargs
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self._queue = global_defer_queue
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self._queue.append(self)
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def __enter__(self):
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return self
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def __exit__(self, ex_type, ex_value, ex_tb):
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return self.exec()
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def exec_only(self):
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self.func(*self.args, **self.kwargs)
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def cancel(self):
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self._queue.remove(self)
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def exec(self):
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self.cancel()
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self.exec_only()
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def tool(name, args, json=None, ns=None, host=None):
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cmd_str = name + ' '
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if json:
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cmd_str += '--json '
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cmd_str += args
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cmd_obj = cmd(cmd_str, ns=ns, host=host)
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if json:
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return _json.loads(cmd_obj.stdout)
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return cmd_obj
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def ip(args, json=None, ns=None, host=None):
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if ns:
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args = f'-netns {ns} ' + args
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return tool('ip', args, json=json, host=host)
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def ethtool(args, json=None, ns=None, host=None):
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return tool('ethtool', args, json=json, ns=ns, host=host)
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def rand_port(type=socket.SOCK_STREAM):
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"""
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Get a random unprivileged port.
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"""
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with socket.socket(socket.AF_INET6, type) as s:
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s.bind(("", 0))
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return s.getsockname()[1]
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def wait_port_listen(port, proto="tcp", ns=None, host=None, sleep=0.005, deadline=5):
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end = time.monotonic() + deadline
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pattern = f":{port:04X} .* "
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if proto == "tcp": # for tcp protocol additionally check the socket state
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pattern += "0A"
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pattern = re.compile(pattern)
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while True:
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data = cmd(f'cat /proc/net/{proto}*', ns=ns, host=host, shell=True).stdout
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for row in data.split("\n"):
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if pattern.search(row):
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return
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if time.monotonic() > end:
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raise Exception("Waiting for port listen timed out")
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time.sleep(sleep)
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