class SlurmctldCharm(CharmBase):
slurm_instance_manager_cls = SlurmSnapInstanceManager
def __init__(self, *args):
super().__init__(*args)
self.dbd_requires = HostPortRequires(self, "slurmdbd-host-port")
self.fw_adapter = FrameworkAdapter(self.framework)
self.slurm_snap = self.slurm_instance_manager_cls(self, "slurmdctld")
self.munge = MungeProvides(self, "munge")
event_handler_bindings = {
self.on.install:
self._on_install,
self.dbd_requires.on.host_port_available:
self._on_dbd_host_port_available,
}
for event, handler in event_handler_bindings.items():
self.fw_adapter.observe(event, handler)
def _on_install(self, event):
handle_install(
event,
self.fw_adapter,
self.slurm_snap,
)
def _on_dbd_host_port_available(self, event):
handle_dbd_host_port_available(
event,
self.fw_adapter,
)
class SlurmdbdCharm(CharmBase):
_state = StoredState()
slurm_instance_manager_cls = SlurmSnapInstanceManager
def __init__(self, *args):
super().__init__(*args)
self._state.set_default(db_info=None)
self._state.set_default(munge_key=None)
# provides host port to slurmctld
self.dbd_provides = HostPortProvides(self, "slurmdbd-host-port", f'{socket.gethostname()}', '6819')
self.slurm_snap = self.slurm_instance_manager_cls(self, "slurmdbd")
self.fw_adapter = FrameworkAdapter(self.framework)
self.db = MySQLClient(self, "db")
self.munge = MungeRequires(self, "munge")
event_handler_bindings = {
self.db.on.database_available: self._on_database_available,
self.munge.on.munge_available: self._on_munge_available,
self.on.install: self._on_install,
self.on.start: self._on_start,
}
for event, handler in event_handler_bindings.items():
self.fw_adapter.observe(event, handler)
def _on_install(self, event):
handle_install(
event,
self.fw_adapter,
self.slurm_snap,
self.dbd_provides,
)
def _on_start(self, event):
handle_start(
event,
self.fw_adapter,
self.slurm_snap,
self._state,
)
def _on_database_available(self, event):
handle_database_available(
event,
self.fw_adapter,
self._state,
)
def _on_munge_available(self, event):
handle_munge_available(
event,
self.fw_adapter,
self.slurm_snap,
self._state,
)
class Charm(CharmBase):
_stored = StoredState()
def __init__(self, *args):
super().__init__(*args)
# Abstract out framework and friends so that this object is not
# too tightly coupled with the underlying framework's implementation.
# From this point forward, our Charm object will only interact with the
# adapter and not directly with the framework.
self.fw_adapter = FrameworkAdapter(self.framework)
self.prometheus = PrometheusInterface(self, 'http-api')
self.alertmanager = AlertManagerInterface(self, 'alertmanager')
# Bind event handlers to events
event_handler_bindings = {
self.on.start: self.on_start,
self.on.config_changed: self.on_config_changed,
self.on.upgrade_charm: self.on_upgrade,
self.on.stop: self.on_stop,
self.alertmanager.on.new_relation:
self.on_new_alertmanager_relation
}
for event, handler in event_handler_bindings.items():
self.fw_adapter.observe(event, handler)
self._stored.set_default(is_started=False)
# DELEGATORS
# These delegators exist to decouple the actual handlers from the
# underlying framework which has some very specific requirements that
# do not always apply to every event. For instance if we were to add
# an interface in our initializer, we would be forced to write unit
# tests that mock out that object even for handlers that do not need
# it. This hard coupling results in verbose tests that contain unused
# mocks. These tests tend to be hard to follow. To counter that, the
# logic is moved away from this class.
def on_config_changed(self, event):
on_config_changed_handler(event, self.fw_adapter, self._stored)
def on_new_alertmanager_relation(self, event):
on_new_alertmanager_relation_handler(event, self.fw_adapter)
def on_start(self, event):
on_start_handler(event, self.fw_adapter)
def on_upgrade(self, event):
on_upgrade_handler(event, self.fw_adapter)
def on_stop(self, event):
on_stop_handler(event, self.fw_adapter)
class PrometheusInterface(Object):
on = PrometheusEvents()
def __init__(self, charm, relation_name):
super().__init__(charm, relation_name)
self.fw_adapter = FrameworkAdapter(self.framework)
self.relation_name = relation_name
self.fw_adapter.observe(charm.on[relation_name].relation_changed,
self.on_relation_changed)
def on_relation_changed(self, event):
logger.debug("Emitting new_prom_rel event")
self.on.new_prom_rel.emit()
logger.debug("Done emitting new_prom_rel_event")
class AlertManagerInterface(Object):
on = AlertManagerEvents()
def __init__(self, charm, relation_name):
super().__init__(charm, relation_name)
self.fw_adapter = FrameworkAdapter(self.framework)
self.relation_name = relation_name
self.fw_adapter.observe(charm.on[relation_name].relation_changed,
self.on_relation_changed)
def on_relation_changed(self, event):
remote_data = event.relation.data[event.unit]
logging.debug("Received remote_data: {}".format(dict(remote_data)))
logger.debug("Emitting new_relation event")
self.on.new_relation.emit(remote_data)
class PrometheusInterface(Object):
on = PrometheusEvents()
def __init__(self, charm, relation_name):
super().__init__(charm, relation_name)
self.fw = FrameworkAdapter(self.framework)
self.relation_name = relation_name
self.fw.observe(charm.on[relation_name].relation_joined,
self.on_relation_joined)
def render_relation_data(self):
logging.debug('render-relation-data in')
for relation in self.model.relations[self.relation_name]:
relation.data[self.model.unit]['prometheus-port'] = \
str(PROMETHEUS_ADVERTISED_PORT)
logging.debug('render-relation-data out')
def on_relation_joined(self, event):
logging.debug("on-joined; emit new-client")
self.on.new_client.emit(event.relation)
self.render_relation_data()