def push_states(self):
# lock the state and generate its various forms
global STATE_LOCK
with STATE_LOCK:
# do not push states until every member's health status
# has been determined
if not STATE.health_converged:
return
# generate ppdns distribution form of the state
dist_form = STATE.to_dist_dict()
# generate generic form of the state
generic_form = util.instance_to_dict(STATE, ignore_private=True)
# all memcache pushes must succeed in order to
# update the state pushed flag(self.state_ts)
pushes_ok = 0
# push PPDNS distribution form of the state
val = self.sm.set(config.BASE['SHARED_MEM_PPDNS_STATE_KEY'], dist_form)
if val is True:
pushes_ok += 1
else:
log_msg = ('failed to write ppdns state to the shared memory')
LOG.error(log_msg)
# push generic form of the state
# add timestampt to the object
generic_form['timestamp'] = STATE_TIMESTAMP
val = self.sm.set(config.BASE['SHARED_MEM_GENERIC_STATE_KEY'],
generic_form)
if val is True:
pushes_ok += 1
else:
log_msg = ('failed to write generic state to the shared memory')
LOG.error(log_msg)
# push state timestamp last
val = self.sm.set(config.BASE['SHARED_MEM_STATE_TIMESTAMP_KEY'],
STATE_TIMESTAMP)
if val is True:
pushes_ok += 1
else:
log_msg = ('failed to write state timestamp to the shared memory')
LOG.error(log_msg)
# if all memcache pushes are successful
# set self.state_ts to STATE_TIMESTAMP so we don't attempt to
# push again until STATE_TIMESTAMP changes
if pushes_ok == 3:
LOG.debug('synced state to the shared memory')
self.state_ts = STATE_TIMESTAMP
def run(self):
"""Main execution loop"""
# init last_scan_state_time so we know when to run the first scan
last_scan_state_time = time.time()
# Track whether status of any of the backend servers changed.
# If the state has changed we will push it to share _mem, but no more
# often than SCAN_STATE_INTERVAL
self.state_changed = False
while True:
# read probe response and process it
try:
# block with a small timeout,
# non-blocking will load cpu needlessly
probe = self.probe_response_queue.get(
True, PROBE_RESPONSE_QUEUE_WAIT)
except queue.Empty: # nothing on the queue
pass
else:
self._process_probe(probe)
# periodically iterate the state and issue new probe requests,
# if there was a state change in the last SCAN_STATE_INTERVAL,
# push it to shared mem
if time.time() - last_scan_state_time > SCAN_STATE_INTERVAL:
# update last scan state time
last_scan_state_time = time.time()
# if the state changed, push it to the shared memory
if self.state_changed:
# push PPDSN distribution form of the state
self._sm.set(config.BASE['SHARED_MEM_PPDNS_STATE_KEY'],
self.state.to_dist_dict())
# push generic form of the state
obj = util.instance_to_dict(self.state)
obj['timestamp'] = time.time()
self._sm.set(config.BASE['SHARED_MEM_GENERIC_STATE_KEY'],
obj)
# reset state changed flag
self.state_changed = False
LOG.debug('synced state, version to the shared memory')
# iterate the state, issue new probe requests
self._scan_state()
def run(self):
"""Main execution loop"""
# init last_scan_state_time so we know when to run the first scan
last_scan_state_time = time.time()
# Track whether status of any of the backend servers changed.
# If the state has changed we will push it to share _mem, but no more
# often than SCAN_STATE_INTERVAL
self.state_changed = False
while True:
# read probe response and process it
try:
# block with a small timeout,
# non-blocking will load cpu needlessly
probe = self.probe_response_queue.get(
True, PROBE_RESPONSE_QUEUE_WAIT)
except queue.Empty: # nothing on the queue
pass
else:
self._process_probe(probe)
# periodically iterate the state and issue new probe requests,
# if there was a state change in the last SCAN_STATE_INTERVAL,
# push it to shared mem
if time.time() - last_scan_state_time > SCAN_STATE_INTERVAL:
# update last scan state time
last_scan_state_time = time.time()
# if the state changed, push it to the shared memory
if self.state_changed:
# push PPDSN distribution form of the state
self._sm.set(config.BASE['SHARED_MEM_PPDNS_STATE_KEY'],
self.state.to_dist_dict())
# push generic form of the state
obj = util.instance_to_dict(self.state)
obj['timestamp'] = time.time()
self._sm.set(config.BASE['SHARED_MEM_GENERIC_STATE_KEY'],
obj)
# reset state changed flag
self.state_changed = False
LOG.debug('synced state, version to the shared memory')
# iterate the state, issue new probe requests
self._scan_state()
def push_states(self):
# lock the state and generate its various forms
global STATE_LOCK
with STATE_LOCK:
# generate ppdns distribution form of the state
dist_form = STATE.to_dist_dict()
# generate generic form of the state
generic_form = util.instance_to_dict(STATE)
# all memcache pushes must succeed in order to
# reset state changed flag
pushes_ok = 0
# push PPDNS distribution form of the state
val = self.sm.set(config.BASE['SHARED_MEM_PPDNS_STATE_KEY'],
dist_form)
if val is True:
pushes_ok += 1
else:
log_msg = 'failed to write ppdns state to the shared memory'
LOG.warning(log_msg)
# push generic form of the state
# add timestampt to the object
generic_form['timestamp'] = STATE_TIMESTAMP
val = self.sm.set(config.BASE['SHARED_MEM_GENERIC_STATE_KEY'],
generic_form)
if val is True:
pushes_ok += 1
else:
log_msg = 'failed to write generic state to the shared memory'
LOG.warning(log_msg)
# push state timestamp last
val = self.sm.set(config.BASE['SHARED_MEM_STATE_TIMESTAMP_KEY'],
STATE_TIMESTAMP)
if val is True:
pushes_ok += 1
else:
log_msg = 'failed to write state timestamp to the shared memory'
LOG.warning(log_msg)
# if all memcache pushes are successful
# set self.state_ts to STATE_TIMESTAMP so we don't attempt to
# push again until STATE_TIMESTAMP changes
if pushes_ok == 3:
LOG.debug('synced state to the shared memory')
self.state_ts = STATE_TIMESTAMP
def print_state(self):
print('state:')
print(to_pretty_json(util.instance_to_dict(self.state)))
def run(self):
"""Main execution loop"""
# init last_scan_state_time so we know when to run the first scan
last_scan_state_time = time.time()
# Track whether status of any of the backend servers changed.
# If the state has changed we will push it to shared mem, but no more
# often than SCAN_STATE_INTERVAL
self.state_changed = False
while True:
# read probe response and process it
try:
# block with a small timeout,
# non-blocking will load cpu needlessly
probe = self.prober_responses.get(
block=True, timeout=PROBE_RESPONSES_QUEUE_WAIT)
except queue.Empty: # nothing on the queue
pass
else:
self._process_probe(probe)
# periodically iterate the state and issue new probe requests,
# if there was a state change in the last SCAN_STATE_INTERVAL,
# push it to shared mem
if time.time() - last_scan_state_time > SCAN_STATE_INTERVAL:
# update last scan state time
last_scan_state_time = time.time()
# if the state changed, push it to the shared memory
if self.state_changed:
# all memcache pushes must succeed in order to
# reset state changed flag
pushes_ok = 0
# push PPDNS distribution form of the state
val = self._sm.set(
config.BASE['SHARED_MEM_PPDNS_STATE_KEY'],
self.state.to_dist_dict())
if val is True:
pushes_ok += 1
else:
log_msg = ('failed to write ppdns '
'state to the shared memory')
LOG.warning(log_msg)
# push generic form of the state
obj = util.instance_to_dict(self.state)
# add epoch time timestampt to the object
obj['timestamp'] = time.time()
val = self._sm.set(
config.BASE['SHARED_MEM_GENERIC_STATE_KEY'], obj)
if val is True:
pushes_ok += 1
else:
log_msg = ('failed to write generic '
'state to the shared memory')
LOG.warning(log_msg)
# if all memcache pushes are successful reset
# state changed flag, otherwise keep it as True
# so a push is attempted on the next iteration
if pushes_ok == 2:
LOG.debug('synced state to the shared memory')
# reset state changed flag
self.state_changed = False
# iterate the state, issue new probe requests
self._scan_state()
def print_state(self):
print('state:')
print(to_pretty_json(util.instance_to_dict(self.state)))
def run(self):
"""Main execution loop"""
# init last_scan_state_time so we know when to run the first scan
last_scan_state_time = time.time()
# Track whether status of any of the backend servers changed.
# If the state has changed we will push it to shared mem, but no more
# often than SCAN_STATE_INTERVAL
self.state_changed = False
while True:
# read probe response and process it
try:
# block with a small timeout,
# non-blocking will load cpu needlessly
probe = self.prober_responses.get(
block=True, timeout=PROBE_RESPONSES_QUEUE_WAIT)
except queue.Empty: # nothing on the queue
pass
else:
self._process_probe(probe)
# periodically iterate the state and issue new probe requests,
# if there was a state change in the last SCAN_STATE_INTERVAL,
# push it to shared mem
if time.time() - last_scan_state_time > SCAN_STATE_INTERVAL:
# update last scan state time
last_scan_state_time = time.time()
# if the state changed, push it to the shared memory
if self.state_changed:
# all memcache pushes must succeed in order to
# reset state changed flag
pushes_ok = 0
# push PPDNS distribution form of the state
val = self._sm.set(
config.BASE['SHARED_MEM_PPDNS_STATE_KEY'],
self.state.to_dist_dict())
if val is True:
pushes_ok += 1
else:
log_msg = ('failed to write ppdns '
'state to the shared memory')
LOG.warning(log_msg)
# push generic form of the state
obj = util.instance_to_dict(self.state)
# add epoch time timestampt to the object
obj['timestamp'] = time.time()
val = self._sm.set(
config.BASE['SHARED_MEM_GENERIC_STATE_KEY'],
obj)
if val is True:
pushes_ok += 1
else:
log_msg = ('failed to write generic '
'state to the shared memory')
LOG.warning(log_msg)
# if all memcache pushes are successful reset
# state changed flag, otherwise keep it as True
# so a push is attempted on the next iteration
if pushes_ok == 2:
LOG.debug('synced state to the shared memory')
# reset state changed flag
self.state_changed = False
# iterate the state, issue new probe requests
self._scan_state()
