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#!/usr/bin/env python |
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from __future__ import print_function |
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4
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import argparse |
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import errno |
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import os |
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import re |
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import readline |
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import select |
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import signal |
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import socket |
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12
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import sys |
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import threading |
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import time |
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try: |
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input = raw_input |
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except NameError: |
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pass |
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SIG_NAMES = {} |
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SIG_NUMBERS = set() |
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for sig, num in vars(signal).items(): |
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if sig.startswith('SIG') and '_' not in sig: |
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SIG_NAMES[sig] = num |
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SIG_NAMES[sig[3:]] = num |
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SIG_NUMBERS.add(num) |
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def parse_pid(value, regex=re.compile(r'^(/tmp/manhole-)?(?P<pid>\d+)$')): |
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match = regex.match(value) |
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if not match: |
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raise argparse.ArgumentTypeError("PID must be in one of these forms: 1234 or /tmp/manhole-1234") |
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return int(match.group('pid')) |
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def parse_signal(value): |
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try: |
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value = int(value) |
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except ValueError: |
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pass |
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else: |
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if value in SIG_NUMBERS: |
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return value |
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else: |
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raise argparse.ArgumentTypeError("Invalid signal number %s. Expected one of: %s" % ( |
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value, ', '.join(str(i) for i in SIG_NUMBERS) |
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)) |
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value = value.upper() |
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if value in SIG_NAMES: |
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return SIG_NAMES[value] |
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else: |
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raise argparse.ArgumentTypeError("Invalid signal name %r." % value) |
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56
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parser = argparse.ArgumentParser(description='Connect to a manhole.') |
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parser.add_argument('pid', metavar='PID', type=parse_pid, # nargs='?', |
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help='A numerical process id, or a path in the form: /tmp/manhole-1234') |
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parser.add_argument('-t', '--timeout', dest='timeout', default=1, type=float, |
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help='Timeout to use. Default: %(default)s seconds.') |
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group = parser.add_mutually_exclusive_group() |
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group.add_argument('-1', '-USR1', dest='signal', action='store_const', const=int(signal.SIGUSR1), |
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help='Send USR1 (%(const)s) to the process before connecting.') |
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group.add_argument('-2', '-USR2', dest='signal', action='store_const', const=int(signal.SIGUSR2), |
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help='Send USR2 (%(const)s) to the process before connecting.') |
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group.add_argument('-s', '--signal', dest='signal', type=parse_signal, metavar="SIGNAL", |
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help='Send the given SIGNAL to the process before connecting.') |
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class ConnectionHandler(threading.Thread): |
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def __init__(self, timeout, sock, read_fd=None, wait_the_end=True): |
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super(ConnectionHandler, self).__init__() |
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self.sock = sock |
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self.read_fd = read_fd |
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self.conn_fd = sock.fileno() |
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self.timeout = timeout |
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self.should_run = True |
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self._poller = select.poll() |
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self.wait_the_end = wait_the_end |
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def run(self): |
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if self.read_fd is not None: |
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self._poller.register(self.read_fd, select.POLLIN) |
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self._poller.register(self.conn_fd, select.POLLIN) |
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while self.should_run: |
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self.poll() |
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if self.wait_the_end: |
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t = time.time() |
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while time.time() - t < self.timeout: |
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self.poll() |
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def poll(self): |
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milliseconds = self.timeout * 1000 |
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for fd, _ in self._poller.poll(milliseconds): |
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if fd == self.conn_fd: |
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data = self.sock.recv(1024*1024) |
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sys.stdout.write(data.decode('utf8')) |
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sys.stdout.flush() |
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readline.redisplay() |
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elif fd == self.read_fd: |
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data = os.read(self.read_fd, 1024) |
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self.sock.sendall(data) |
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else: |
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raise RuntimeError("Unknown FD %s" % fd) |
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108
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109
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def main(): |
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args = parser.parse_args() |
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112
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histfile = os.path.join(os.path.expanduser("~"), ".manhole_history") |
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try: |
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readline.read_history_file(histfile) |
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except IOError: |
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pass |
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import atexit |
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119
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atexit.register(readline.write_history_file, histfile) |
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del histfile |
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122
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if args.signal: |
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os.kill(args.pid, args.signal) |
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125
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start = time.time() |
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uds_path = '/tmp/manhole-%s' % args.pid |
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sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM) |
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sock.settimeout(args.timeout) |
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while time.time() - start < args.timeout: |
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try: |
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sock.connect(uds_path) |
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except Exception as exc: |
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if exc.errno not in (errno.ENOENT, errno.ECONNREFUSED): |
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print("Failed to connect to %r: %r" % (uds_path, exc), file=sys.stderr) |
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else: |
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break |
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else: |
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print("Failed to connect to %r: Timeout" % uds_path, file=sys.stderr) |
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sys.exit(5) |
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141
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read_fd, write_fd = os.pipe() |
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143
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thread = ConnectionHandler(args.timeout, sock, read_fd, not sys.stdin.isatty()) |
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144
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thread.start() |
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145
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146
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try: |
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while thread.is_alive(): |
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148
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try: |
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149
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data = input() |
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150
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except EOFError: |
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break |
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152
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os.write(write_fd, data.encode('utf8')) |
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153
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os.write(write_fd, b'\n') |
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154
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except KeyboardInterrupt: |
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155
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pass |
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156
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finally: |
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157
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thread.should_run = False |
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158
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thread.join() |
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ionelmc /
python-manhole
