import tempfile import os import cdist from cdist.integration import configure_hosts_simple from celery.result import AsyncResult from celery.utils.log import get_task_logger from django.conf import settings from django.core.mail import EmailMessage from dynamicweb.celery import app logger = get_task_logger(__name__) @app.task(bind=True, max_retries=settings.CELERY_MAX_RETRIES) def send_plain_email_task(self, email_data): """ This is a generic celery task to be used for sending emails. A celery wrapper task for EmailMessage :param self: :param email_data: A dict of all needed email headers :return: """ email = EmailMessage(**email_data) email.send() @app.task(bind=True, max_retries=settings.CELERY_MAX_RETRIES) def save_ssh_key(self, hosts, keys): """ Saves ssh key into the VMs of a user using cdist :param hosts: A list of hosts to be configured :param keys: A list of keys to be added. A key should be dict of the form { 'value': 'sha-.....', # public key as string 'state': True # whether key is to be added or } # removed """ logger.debug("""Running save_ssh_key task for Hosts: {hosts_str} Keys: {keys_str}""".format(hosts_str=", ".join(hosts), keys_str=", ".join([ "{value}->{state}".format( value=key.get('value'), state=str( key.get('state'))) for key in keys])) ) return_value = True with tempfile.NamedTemporaryFile(delete=True) as tmp_manifest: # Generate manifest to be used for configuring the hosts lines_list = [ ' --key "{key}" --state {state} \\\n'.format( key=key['value'], state='present' if key['state'] else 'absent' ).encode('utf-8') for key in keys] lines_list.insert(0, b'__ssh_authorized_keys root \\\n') tmp_manifest.writelines(lines_list) tmp_manifest.flush() try: configure_hosts_simple(hosts, tmp_manifest.name, verbose=cdist.argparse.VERBOSE_TRACE) except Exception as cdist_exception: logger.error(cdist_exception) return_value = False try: os.remove(tmp_manifest.name) except OSError: pass return return_value @app.task def save_ssh_key_error_handler(uuid): result = AsyncResult(uuid) exc = result.get(propagate=False) logger.error('Task {0} raised exception: {1!r}\n{2!r}'.format( uuid, exc, result.traceback)) email_data = { 'subject': "[celery error] Save SSH key error {0}".format(uuid), 'from_email': settings.DCL_SUPPORT_FROM_ADDRESS, 'to': ['info@ungleich.ch'], 'body': "Task Id: {0}\nResult: {1}\nTraceback: {2}".format( uuid, exc, result.traceback), } send_plain_email_task(email_data)