#!/usr/bin/env python # # Copyright CEA/DAM/DIF (2010, 2011, 2012) # Contributor: Henri DOREAU # Contributor: Stephane THIELL # # This file is part of the ClusterShell library. # # This software is governed by the CeCILL-C license under French law and # abiding by the rules of distribution of free software. You can use, # modify and/ or redistribute the software under the terms of the CeCILL-C # license as circulated by CEA, CNRS and INRIA at the following URL # "http://www.cecill.info". # # As a counterpart to the access to the source code and rights to copy, # modify and redistribute granted by the license, users are provided only # with a limited warranty and the software's author, the holder of the # economic rights, and the successive licensors have only limited # liability. # # In this respect, the user's attention is drawn to the risks associated # with loading, using, modifying and/or developing or reproducing the # software by the user in light of its specific status of free software, # that may mean that it is complicated to manipulate, and that also # therefore means that it is reserved for developers and experienced # professionals having in-depth computer knowledge. Users are therefore # encouraged to load and test the software's suitability as regards their # requirements in conditions enabling the security of their systems and/or # data to be ensured and, more generally, to use and operate it in the # same conditions as regards security. # # The fact that you are presently reading this means that you have had # knowledge of the CeCILL-C license and that you accept its terms. """ ClusterShell agent launched on remote gateway nodes. This script reads messages on stdin via the SSH connexion, interprets them, takes decisions, and prints out replies on stdout. """ import logging import os import sys from ClusterShell.Event import EventHandler from ClusterShell.NodeSet import NodeSet from ClusterShell.Task import task_self, _getshorthostname from ClusterShell.Engine.Engine import EngineAbortException from ClusterShell.Worker.fastsubprocess import set_nonblock_flag from ClusterShell.Worker.Worker import WorkerSimple from ClusterShell.Worker.Tree import WorkerTree from ClusterShell.Communication import Channel, ConfigurationMessage, \ ControlMessage, ACKMessage, ErrorMessage, EndMessage, StdOutMessage, \ StdErrMessage, RetcodeMessage, TimeoutMessage class WorkerTreeResponder(EventHandler): """Gateway WorkerTree handler""" def __init__(self, task, gwchan, srcwkr): EventHandler.__init__(self) self.gwchan = gwchan # gateway channel self.srcwkr = srcwkr # id of distant parent WorkerTree self.worker = None # local WorkerTree instance # For messages grooming qdelay = task.info("grooming_delay") self.timer = task.timer(qdelay, self, qdelay, autoclose=True) self.logger = logging.getLogger(__name__) self.logger.debug("WorkerTreeResponder: initialized") def ev_start(self, worker): self.logger.debug("WorkerTreeResponder: ev_start") self.worker = worker def ev_timer(self, timer): """perform gateway traffic grooming""" if not self.worker: return logger = self.logger # check for grooming opportunities for msg_elem, nodes in self.worker.iter_errors(): logger.debug("iter(stderr): %s: %d bytes" % \ (nodes, len(msg_elem.message()))) self.gwchan.send(StdErrMessage(nodes, msg_elem.message(), \ self.srcwkr)) for msg_elem, nodes in self.worker.iter_buffers(): logger.debug("iter(stdout): %s: %d bytes" % \ (nodes, len(msg_elem.message()))) self.gwchan.send(StdOutMessage(nodes, msg_elem.message(), \ self.srcwkr)) self.worker.flush_buffers() def ev_error(self, worker): self.logger.debug("WorkerTreeResponder: ev_error %s" % \ worker.current_errmsg) def ev_timeout(self, worker): """Received timeout event: some nodes did timeout""" self.gwchan.send(TimeoutMessage( \ NodeSet._fromlist1(worker.iter_keys_timeout()), self.srcwkr)) def ev_close(self, worker): """End of responder""" self.logger.debug("WorkerTreeResponder: ev_close") # finalize grooming self.ev_timer(None) # send retcodes for rc, nodes in self.worker.iter_retcodes(): self.logger.debug("iter(rc): %s: rc=%d" % (nodes, rc)) self.gwchan.send(RetcodeMessage(nodes, rc, self.srcwkr)) self.timer.invalidate() # clean channel closing ####self.gwchan.close() class GatewayChannel(Channel): """high level logic for gateways""" def __init__(self, task, hostname): """ """ Channel.__init__(self) self.task = task self.hostname = hostname self.topology = None self.propagation = None self.logger = logging.getLogger(__name__) self.current_state = None self.states = { 'CFG': self._state_cfg, 'CTL': self._state_ctl, 'GTR': self._state_gtr, } def start(self): """initialization""" self._open() # prepare to receive topology configuration self.current_state = self.states['CFG'] self.logger.debug('entering config state') def close(self): """close gw channel""" self.logger.debug('closing gw channel') self._close() self.current_state = None def recv(self, msg): """handle incoming message""" try: self.logger.debug('handling incoming message: %s', str(msg)) if msg.ident == EndMessage.ident: self.logger.debug('recv: got EndMessage') self.worker.abort() else: self.current_state(msg) except Exception, ex: self.logger.exception('on recv(): %s', str(ex)) self.send(ErrorMessage(str(ex))) def _state_cfg(self, msg): """receive topology configuration""" if msg.type == ConfigurationMessage.ident: self.topology = msg.data_decode() task_self().topology = self.topology self.logger.debug('decoded propagation tree') self.logger.debug('%s' % str(self.topology)) self._ack(msg) self.current_state = self.states['CTL'] self.logger.debug('entering control state') else: logging.error('unexpected message: %s', str(msg)) def _state_ctl(self, msg): """receive control message with actions to perform""" if msg.type == ControlMessage.ident: self.logger.debug('GatewayChannel._state_ctl') self._ack(msg) if msg.action == 'shell': data = msg.data_decode() cmd = data['cmd'] stderr = data['stderr'] timeout = data['timeout'] #self.propagation.invoke_gateway = data['invoke_gateway'] self.logger.debug('decoded gw invoke (%s)', \ data['invoke_gateway']) taskinfo = data['taskinfo'] task = task_self() task._info = taskinfo task._engine.info = taskinfo #logging.setLevel(logging.DEBUG) self.logger.debug('assigning task infos (%s)' % \ str(data['taskinfo'])) self.logger.debug('inherited fanout value=%d', \ task.info("fanout")) #self.current_state = self.states['GTR'] self.logger.debug('launching execution/enter gathering state') responder = WorkerTreeResponder(task, self, msg.srcid) self.propagation = WorkerTree(msg.target, responder, timeout, command=cmd, topology=self.topology, newroot=self.hostname, stderr=stderr) responder.worker = self.propagation # FIXME ev_start-not-called workaround self.propagation.upchannel = self task.schedule(self.propagation) self.logger.debug("WorkerTree scheduled") else: logging.error('unexpected message: %s', str(msg)) def _state_gtr(self, msg): """gather outputs""" # FIXME self.logger.debug('GatewayChannel._state_gtr') self.logger.debug('incoming output msg: %s' % str(msg)) def _ack(self, msg): """acknowledge a received message""" self.send(ACKMessage(msg.msgid)) def gateway_main(): """ClusterShell gateway entry point""" host = _getshorthostname() # configure root logger logdir = os.path.expanduser(os.environ.get('CLUSTERSHELL_GW_LOG_DIR', \ '/tmp')) loglevel = os.environ.get('CLUSTERSHELL_GW_LOG_LEVEL', 'INFO') logging.basicConfig(level=getattr(logging, loglevel.upper(), logging.INFO), format='%(asctime)s %(name)s %(levelname)s %(message)s', filename=os.path.join(logdir, "%s.gw.log" % host)) logger = logging.getLogger(__name__) logger.debug('Starting gateway on %s', host) logger.debug("environ=%s" % os.environ) set_nonblock_flag(sys.stdin.fileno()) set_nonblock_flag(sys.stdout.fileno()) set_nonblock_flag(sys.stderr.fileno()) task = task_self() # Pre-enable MsgTree buffering on gateway (not available at runtime - #181) task.set_default("stdout_msgtree", True) task.set_default("stderr_msgtree", True) if sys.stdin.isatty(): logger.critical('Gateway failure: sys.stdin.isatty() is True') sys.exit(1) worker = WorkerSimple(sys.stdin, sys.stdout, sys.stderr, None, handler=GatewayChannel(task, host)) task.schedule(worker) logger.debug('Starting task') try: task.resume() logger.debug('Task performed') except EngineAbortException, exc: pass except IOError, exc: logger.debug('Broken pipe (%s)' % exc) raise except Exception, exc: logger.exception('Gateway failure: %s' % exc) logger.debug('The End') if __name__ == '__main__': __name__ = 'ClusterShell.Gateway' # To enable gateway profiling: #import cProfile #cProfile.run('gateway_main()', '/tmp/gwprof') gateway_main()