import hashlib import json import logging import os import socket import sys import select import paramiko from celery.datastructures import ExceptionInfo from django.conf import settings as djsettings from . import settings logger = logging.getLogger(__name__) transports = {} def SSH(backend, log, server, cmds, async=False): """ Executes cmds to remote server using SSH The script is first copied using SCP in order to overflood the channel with large scripts Then the script is executed using the defined backend.script_executable """ script = '\n'.join(cmds) script = script.replace('\r', '') digest = hashlib.md5(script).hexdigest() path = os.path.join(settings.ORCHESTRATION_TEMP_SCRIPT_PATH, digest) remote_path = "%s.remote" % path log.script = '# %s\n%s' % (remote_path, script) log.save(update_fields=['script']) if not cmds: return channel = None ssh = None try: logger.debug('%s is going to be executed on %s' % (backend, server)) # Avoid "Argument list too long" on large scripts by genereting a file # and scping it to the remote server with os.fdopen(os.open(path, os.O_WRONLY | os.O_CREAT, 0600), 'w') as handle: handle.write(script) # ssh connection ssh = paramiko.SSHClient() ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy()) addr = server.get_address() key = settings.ORCHESTRATION_SSH_KEY_PATH try: ssh.connect(addr, username='root', key_filename=key, timeout=10) except socket.error, e: logger.error('%s timed out on %s' % (backend, addr)) log.state = log.TIMEOUT log.stderr = str(e) log.save(update_fields=['state', 'stderr']) return transport = ssh.get_transport() # Copy script to remote server sftp = paramiko.SFTPClient.from_transport(transport) sftp.put(path, remote_path) sftp.chmod(remote_path, 0600) sftp.close() os.remove(path) # Execute it context = { 'executable': backend.script_executable, 'remote_path': remote_path, 'digest': digest, 'remove': '' if djsettings.DEBUG else "rm -fr %(remote_path)s\n", } cmd = ( "[[ $(md5sum %(remote_path)s|awk {'print $1'}) == %(digest)s ]] && %(executable)s %(remote_path)s\n" "RETURN_CODE=$?\n" "%(remove)s" "exit $RETURN_CODE" % context ) channel = transport.open_session() channel.exec_command(cmd) # Log results logger.debug('%s running on %s' % (backend, server)) if async: while True: # Non-blocking is the secret ingridient in the async sauce select.select([channel], [], []) if channel.recv_ready(): part = channel.recv(1024) while part: log.stdout += part part = channel.recv(1024) if channel.recv_stderr_ready(): part = channel.recv_stderr(1024) while part: log.stderr += part part = channel.recv_stderr(1024) log.save(update_fields=['stdout', 'stderr']) if channel.exit_status_ready(): break else: log.stdout += channel.makefile('rb', -1).read().decode('utf-8') log.stderr += channel.makefile_stderr('rb', -1).read().decode('utf-8') log.exit_code = exit_code = channel.recv_exit_status() log.state = log.SUCCESS if exit_code == 0 else log.FAILURE logger.debug('%s execution state on %s is %s' % (backend, server, log.state)) log.save() except: log.state = log.ERROR log.traceback = ExceptionInfo(sys.exc_info()).traceback logger.error('Exception while executing %s on %s' % (backend, server)) logger.debug(log.traceback) log.save() finally: if channel is not None: channel.close() if ssh is not None: ssh.close() def Python(backend, log, server, cmds, async=False): # TODO collect stdout? script = [ str(cmd.func.func_name) + str(cmd.args) for cmd in cmds ] script = json.dumps(script, indent=4).replace('"', '') log.script = '\n'.join([log.script, script]) log.save(update_fields=['script']) try: for cmd in cmds: result = cmd(server) log.stdout += str(result) if async: log.save(update_fields=['stdout']) except: log.exit_code = 1 log.state = log.FAILURE log.traceback = ExceptionInfo(sys.exc_info()).traceback else: log.exit_code = 0 log.state = log.SUCCESS log.save()