dynamicweb/utils/tasks.py

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import tempfile
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import cdist
from cdist.integration import configure_hosts_simple
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from celery.result import AsyncResult
from celery import current_task
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from celery.utils.log import get_task_logger
from django.conf import settings
from django.core.mail import EmailMessage
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from dynamicweb.celery import app
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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()
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@app.task(bind=True, max_retries=settings.CELERY_MAX_RETRIES)
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def save_ssh_key(self, hosts, keys):
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"""
Saves ssh key into the VMs of a user using cdist
:param hosts: A list of hosts to be configured
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: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
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"""
logger.debug(
"Running save_ssh_key on {}".format(current_task.request.hostname))
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logger.debug("""Running save_ssh_key task for
Hosts: {hosts_str}
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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]))
)
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return_value = True
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with tempfile.NamedTemporaryFile(delete=True) as tmp_manifest:
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# Generate manifest to be used for configuring the hosts
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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]
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lines_list.insert(0, b'__ssh_authorized_keys root \\\n')
tmp_manifest.writelines(lines_list)
tmp_manifest.flush()
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try:
configure_hosts_simple(hosts,
tmp_manifest.name,
verbose=cdist.argparse.VERBOSE_TRACE)
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except Exception as cdist_exception:
logger.error(cdist_exception)
return_value = False
email_data = {
'subject': "celery save_ssh_key error - task id {0}".format(
self.request.id.__str__()),
'from_email': current_task.request.hostname,
'to': settings.DCL_ERROR_EMAILS_TO_LIST,
'body': "Task Id: {0}\nResult: {1}\nTraceback: {2}".format(
self.request.id.__str__(), False, str(cdist_exception)),
}
send_plain_email_task(email_data)
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return return_value
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@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': current_task.request.hostname,
'to': settings.DCL_ERROR_EMAILS_TO_LIST,
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'body': "Task Id: {0}\nResult: {1}\nTraceback: {2}".format(
uuid, exc, result.traceback),
}
send_plain_email_task(email_data)