| #!/usr/bin/env python |
| |
| ''' |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you under the Apache License, Version 2.0 (the |
| "License"); you may not use this file except in compliance |
| with the License. You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| ''' |
| |
| import sys |
| import logging |
| import threading |
| import socket |
| import subprocess |
| |
| logger = logging.getLogger(__name__) |
| FUSER_CMD = "fuser {0}/tcp 2>/dev/null | awk '{1}'" |
| PSPF_CMD = "ps -fp {0}" |
| PORT_IN_USE_MESSAGE = "Could not open port {0} because port already used by another process:\n{1}" |
| |
| class PingPortListener(threading.Thread): |
| |
| def __init__(self, config): |
| threading.Thread.__init__(self) |
| self.daemon = True |
| self.running = True |
| self.config = config |
| self.host = '0.0.0.0' |
| self.port = int(self.config.get('agent','ping_port')) |
| if not self.port == None and not self.port == 0: |
| (stdoutdata, stderrdata) = self.run_os_command_in_shell(FUSER_CMD.format(str(self.port), "{print $1}")) |
| if stdoutdata.strip() and stdoutdata.strip().isdigit(): |
| (stdoutdata, stderrdata) = self.run_os_command_in_shell(PSPF_CMD.format(stdoutdata.strip())) |
| raise Exception(PORT_IN_USE_MESSAGE.format(str(self.port), stdoutdata)) |
| self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
| self.socket.bind((self.host, self.port)) |
| self.socket.listen(1) |
| config.set('agent','current_ping_port',str(self.socket.getsockname()[1])) |
| logger.info("Ping port listener started on port: " + str(self.socket.getsockname()[1])) |
| |
| |
| def run_os_command_in_shell(self, command): |
| process = subprocess.Popen(command, stdout=subprocess.PIPE, |
| stdin=subprocess.PIPE, |
| stderr=subprocess.PIPE, |
| shell=True) |
| return process.communicate() |
| |
| def __del__(self): |
| logger.info("Ping port listener killed") |
| |
| |
| def run(self): |
| while self.running: |
| try: |
| conn, addr = self.socket.accept() |
| conn.send("OK") |
| conn.close() |
| except Exception as ex: |
| logger.error("Failed in Ping port listener because of:" + str(ex)); |
| sys.exit(1) |
| pass |