def reload_stack_root_config(self, now):
"""
Force reload & apply configuration for stack root changes
Args:
now (float): Current time
"""
dps = dp_preparsed_parser(self.meta_dp_state.top_conf, self.meta_dp_state)
self._apply_configs(dps, now, None)
def maintain_stack_root(self, now):
"""Maintain current stack root and return True if stack root changes."""
for valve in self.valves.values():
if valve.dp.dyn_running:
self.meta_dp_state.dp_last_live_time[valve.dp.name] = now
stacked_dps = [valve.dp for valve in self.valves.values() if valve.dp.stack_root_name]
if not stacked_dps:
return False
candidate_stack_roots_names = stacked_dps[0].stack_roots_names
candidate_dps = [dp for dp in stacked_dps if dp.name in candidate_stack_roots_names]
healthy_stack_roots_names = self.healthy_stack_roots(now, candidate_dps)
if healthy_stack_roots_names:
new_stack_root_name = self.meta_dp_state.stack_root_name
# Only pick a new root if the current one is unhealthy.
if self.meta_dp_state.stack_root_name not in healthy_stack_roots_names:
new_stack_root_name = healthy_stack_roots_names[0]
else:
# Pick the first candidate if no roots are healthy
new_stack_root_name = candidate_stack_roots_names[0]
stack_change = False
if self.meta_dp_state.stack_root_name != new_stack_root_name:
self.logger.info('stack root changed from %s to %s' % (
self.meta_dp_state.stack_root_name, new_stack_root_name))
if self.meta_dp_state.stack_root_name:
stack_change = True
prev_root = [dp for dp in stacked_dps if dp.name == self.meta_dp_state.stack_root_name]
labels = prev_root[0].base_prom_labels()
self.metrics.is_dp_stack_root.labels(**labels).set(0)
self.meta_dp_state.stack_root_name = new_stack_root_name
dpids = [dp.dp_id for dp in stacked_dps if dp.name == new_stack_root_name]
self.metrics.faucet_stack_root_dpid.set(dpids[0])
else:
inconsistent_dps = [
dp.name for dp in stacked_dps
if dp.stack_root_name != self.meta_dp_state.stack_root_name]
if inconsistent_dps:
self.logger.info('stack root on %s inconsistent' % inconsistent_dps)
stack_change = True
if stack_change:
self.logger.info(
'root now %s (all candidates %s, healthy %s)' % (
self.meta_dp_state.stack_root_name,
candidate_stack_roots_names,
healthy_stack_roots_names))
dps = dp_preparsed_parser(self.meta_dp_state.top_conf, self.meta_dp_state)
self._apply_configs(dps, now, None)
root_dps = [dp for dp in stacked_dps if dp.name == new_stack_root_name]
labels = root_dps[0].base_prom_labels()
self.metrics.is_dp_stack_root.labels(**labels).set(1)
return stack_change
