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