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|
"""
This module is used to translate Events from Marathon's EventBus system.
See:
* https://mesosphere.github.io/marathon/docs/event-bus.html
* https://github.com/mesosphere/marathon/blob/master/src/main/scala/mesosphere/marathon/core/event/Events.scala
"""
from marathon.models.base import MarathonObject
from marathon.models.app import MarathonHealthCheck
from marathon.models.task import MarathonIpAddress
from marathon.models.deployment import MarathonDeploymentPlan
from marathon.exceptions import MarathonError
class MarathonEvent(MarathonObject):
"""
The MarathonEvent base class handles the translation of Event objects sent by the
Marathon server into library MarathonObjects.
"""
KNOWN_ATTRIBUTES = []
attribute_name_to_marathon_object = { # Allows embedding of MarathonObjects inside events.
'health_check': MarathonHealthCheck,
'plan': MarathonDeploymentPlan,
'ip_address': MarathonIpAddress,
}
seq_name_to_singular = {
'ip_addresses': 'ip_address',
}
def __init__(self, event_type, timestamp, **kwargs):
self.event_type = event_type # All events have these two attributes
self.timestamp = timestamp
for attribute in self.KNOWN_ATTRIBUTES:
self._set(attribute, kwargs.get(attribute))
def __to_marathon_object(self, attribute_name, attribute):
if attribute_name in self.attribute_name_to_marathon_object:
clazz = self.attribute_name_to_marathon_object[attribute_name]
# If this attribute already has a Marathon object instantiate it.
attribute = clazz.from_json(attribute)
return attribute
def _set(self, attribute_name, attribute):
if not attribute:
return
# Special handling for lists...
if isinstance(attribute, list):
name = self.seq_name_to_singular.get(attribute_name)
attribute = [
self.__to_marathon_object(name, v)
for v in attribute
]
else:
attribute = self.__to_marathon_object(attribute_name, attribute)
setattr(self, attribute_name, attribute)
class MarathonApiPostEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['client_ip', 'app_definition', 'uri']
class MarathonStatusUpdateEvent(MarathonEvent):
KNOWN_ATTRIBUTES = [
'slave_id', 'task_id', 'task_status', 'app_id', 'host', 'ports', 'version', 'message', 'ip_addresses']
class MarathonFrameworkMessageEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['slave_id', 'executor_id', 'message']
class MarathonSubscribeEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['client_ip', 'callback_url']
class MarathonUnsubscribeEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['client_ip', 'callback_url']
class MarathonAddHealthCheckEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['app_id', 'health_check', 'version']
class MarathonRemoveHealthCheckEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['app_id', 'health_check']
class MarathonFailedHealthCheckEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['app_id', 'health_check', 'task_id', 'instance_id']
class MarathonHealthStatusChangedEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['app_id', 'health_check', 'task_id', 'instance_id', 'alive']
class MarathonGroupChangeSuccess(MarathonEvent):
KNOWN_ATTRIBUTES = ['group_id', 'version']
class MarathonGroupChangeFailed(MarathonEvent):
KNOWN_ATTRIBUTES = ['group_id', 'version', 'reason']
class MarathonDeploymentSuccess(MarathonEvent):
KNOWN_ATTRIBUTES = ['id']
class MarathonDeploymentFailed(MarathonEvent):
KNOWN_ATTRIBUTES = ['id']
class MarathonDeploymentInfo(MarathonEvent):
KNOWN_ATTRIBUTES = ['plan', 'current_step']
class MarathonDeploymentStepSuccess(MarathonEvent):
KNOWN_ATTRIBUTES = ['plan']
class MarathonDeploymentStepFailure(MarathonEvent):
KNOWN_ATTRIBUTES = ['plan']
class MarathonEventStreamAttached(MarathonEvent):
KNOWN_ATTRIBUTES = ['remote_address']
class MarathonEventStreamDetached(MarathonEvent):
KNOWN_ATTRIBUTES = ['remote_address']
class MarathonUnhealthyTaskKillEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['app_id', 'task_id', 'instance_id', 'version', 'reason']
class MarathonAppTerminatedEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['app_id']
class MarathonInstanceChangedEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['instance_id', 'slave_id', 'condition', 'host', 'run_spec_id', 'run_spec_version']
class MarathonUnknownInstanceTerminated(MarathonEvent):
KNOWN_ATTRIBUTES = ['instance_id', 'run_spec_id', 'condition']
class MarathonInstanceHealthChangedEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['instance_id', 'run_spec_id', 'run_spec_version', 'healthy']
class MarathonPodCreatedEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['client_ip', 'uri']
class MarathonPodUpdatedEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['client_ip', 'uri']
class MarathonPodDeletedEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['client_ip', 'uri']
class MarathonUnhealthyInstanceKillEvent(MarathonEvent):
KNOWN_ATTRIBUTES = ['app_id', 'task_id', 'instance_id', 'version', 'reason', 'host', 'slave_id']
class EventFactory:
"""
Handle an event emitted from the Marathon EventBus
See: https://mesosphere.github.io/marathon/docs/event-bus.html
"""
def __init__(self):
pass
event_to_class = {
'api_post_event': MarathonApiPostEvent,
'status_update_event': MarathonStatusUpdateEvent,
'framework_message_event': MarathonFrameworkMessageEvent,
'subscribe_event': MarathonSubscribeEvent,
'unsubscribe_event': MarathonUnsubscribeEvent,
'add_health_check_event': MarathonAddHealthCheckEvent,
'remove_health_check_event': MarathonRemoveHealthCheckEvent,
'failed_health_check_event': MarathonFailedHealthCheckEvent,
'health_status_changed_event': MarathonHealthStatusChangedEvent,
'unhealthy_task_kill_event': MarathonUnhealthyTaskKillEvent,
'group_change_success': MarathonGroupChangeSuccess,
'group_change_failed': MarathonGroupChangeFailed,
'deployment_success': MarathonDeploymentSuccess,
'deployment_failed': MarathonDeploymentFailed,
'deployment_info': MarathonDeploymentInfo,
'deployment_step_success': MarathonDeploymentStepSuccess,
'deployment_step_failure': MarathonDeploymentStepFailure,
'event_stream_attached': MarathonEventStreamAttached,
'event_stream_detached': MarathonEventStreamDetached,
'app_terminated_event': MarathonAppTerminatedEvent,
'instance_changed_event': MarathonInstanceChangedEvent,
'unknown_instance_terminated_event': MarathonUnknownInstanceTerminated,
'unhealthy_instance_kill_event': MarathonUnhealthyInstanceKillEvent,
'instance_health_changed_event': MarathonInstanceHealthChangedEvent,
'pod_created_event': MarathonPodCreatedEvent,
'pod_updated_event': MarathonPodUpdatedEvent,
'pod_deleted_event': MarathonPodDeletedEvent,
}
class_to_event = {v: k for k, v in event_to_class.items()}
def process(self, event):
event_type = event['eventType']
if event_type in self.event_to_class:
clazz = self.event_to_class[event_type]
return clazz.from_json(event)
else:
raise MarathonError(f'Unknown event_type: {event_type}, data: {event}')
|
