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Refactor Tower HA Instance logic and models

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* Gut the HA middleware
* Purge concept of primary and secondary.
* UUID is not the primary host identifier, now it's based mostly on the
  username.  Some work probably still left to do to make sure this is
  legit.  Also removed unique constraint from the uuid field.  This
  might become the cluster ident now... or it may just deprecate
* No more secondary -> primary redirection
* Initial revision of /api/v1/ping
* Revise and gut tower-manage register_instance
* Rename awx/main/socket.py to awx/main/socket_queue.py to prevent
  conflict with the "socket" module from python base
* Revist/gut the Instance manager... not sure if this manager is really
  needed anymore
This commit is contained in:
Matthew Jones
2016-09-08 13:37:53 -04:00
parent eafb6c92b5
commit 0c1e1fa2fb
14 changed files with 56 additions and 210 deletions
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48
awx/main/management/commands/register_instance.py
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@@ -9,22 +9,14 @@ from awx.main.models import Instance
instance_str = BaseCommandInstance.instance_str
class Command(BaseCommandInstance):
"""Internal tower command.
"""
Internal tower command.
Regsiter this instance with the database for HA tracking.
This command is idempotent.
This command will error out in the following conditions:
* Attempting to register a secondary machine with no primary machines.
* Attempting to register a primary instance when a different primary
instance exists.
* Attempting to re-register an instance with changed values.
"""
def __init__(self):
super(Command, self).__init__()
self.include_options_roles()
self.include_option_hostname_set()
def handle(self, *args, **options):
@@ -32,32 +24,10 @@ class Command(BaseCommandInstance):
uuid = self.get_UUID()
# Is there an existing record for this machine? If so, retrieve that record and look for issues.
try:
instance = Instance.objects.get(uuid=uuid)
if instance.hostname != self.get_option_hostname():
raise CommandError('Instance already registered with a different hostname %s.' % instance_str(instance))
print("Instance already registered %s" % instance_str(instance))
except Instance.DoesNotExist:
# Get a status on primary machines (excluding this one, regardless of its status).
other_instances = Instance.objects.exclude(uuid=uuid)
primaries = other_instances.filter(primary=True).count()
# If this instance is being set to primary and a *different* primary machine alreadyexists, error out.
if self.is_option_primary() and primaries:
raise CommandError('Another instance is already registered as primary.')
# Lastly, if there are no primary machines at all, then don't allow this to be registered as a secondary machine.
if self.is_option_secondary() and not primaries:
raise CommandError('Unable to register a secondary machine until another primary machine has been registered.')
# Okay, we've checked for appropriate errata; perform the registration.
instance = Instance(uuid=uuid, primary=self.is_option_primary(), hostname=self.get_option_hostname())
instance.save()
# If this is a primary instance, update projects.
if instance.primary:
self.update_projects(instance)
# Done!
print('Successfully registered instance %s.' % instance_str(instance))
instance = Instance.objects.filter(hostname=self.get_option_hostname())
if instance.exists():
print("Instance already registered %s" % instance_str(instance[0]))
return
instance = Instance(uuid=uuid, hostname=self.get_option_hostname())
instance.save()
print('Successfully registered instance %s.' % instance_str(instance))