46 lines
1.3 KiB
Python
46 lines
1.3 KiB
Python
import copy
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import time
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class Heartbeat(object):
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DEFAULT_CONFIG = {
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'heartbeat_interval_ms': 3000,
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'session_timeout_ms': 30000,
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}
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def __init__(self, **configs):
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self.config = copy.copy(self.DEFAULT_CONFIG)
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for key in self.config:
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if key in configs:
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self.config[key] = configs[key]
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assert (self.config['heartbeat_interval_ms']
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<= self.config['session_timeout_ms']), (
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'Heartbeat interval must be lower than the session timeout')
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self.interval = self.config['heartbeat_interval_ms'] / 1000.0
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self.timeout = self.config['session_timeout_ms'] / 1000.0
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self.last_send = 0
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self.last_receive = 0
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self.last_reset = time.time()
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def sent_heartbeat(self):
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self.last_send = time.time()
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def received_heartbeat(self):
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self.last_receive = time.time()
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def ttl(self):
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last_beat = max(self.last_send, self.last_reset)
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return max(0, last_beat + self.interval - time.time())
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def should_heartbeat(self):
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return self.ttl() == 0
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def session_expired(self):
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last_recv = max(self.last_receive, self.last_reset)
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return (time.time() - last_recv) > self.timeout
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def reset_session_timeout(self):
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self.last_reset = time.time()
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