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import time
import kafka.common as Errors
class Heartbeat(object):
_heartbeat_interval_ms = 3000
_session_timeout_ms = 30000
def __init__(self, **kwargs):
for config in ('heartbeat_interval_ms', 'session_timeout_ms'):
if config in kwargs:
setattr(self, '_' + config, kwargs.pop(config))
if self._heartbeat_interval_ms > self._session_timeout_ms:
raise Errors.IllegalArgumentError("Heartbeat interval must be set"
" lower than the session timeout")
self.interval = self._heartbeat_interval_ms / 1000.0
self.timeout = self._session_timeout_ms / 1000.0
self.last_send = 0
self.last_receive = 0
self.last_reset = time.time()
def sent_heartbeat(self):
self.last_send = time.time()
def received_heartbeat(self):
self.last_receive = time.time()
def ttl(self):
last_beat = max(self.last_send, self.last_reset)
return max(0, last_beat + self.interval - time.time())
def should_heartbeat(self):
return self.ttl() == 0
def session_expired(self):
last_recv = max(self.last_receive, self.last_reset)
return (time.time() - last_recv) > self.timeout
def reset_session_timeout(self):
self.last_reset = time.time()
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