93 lines
2.7 KiB
Python
93 lines
2.7 KiB
Python
#!/usr/bin/env python
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import datetime
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import communicator
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"""
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Consumer locator modul, that manages the list of consumers.
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"""
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__author__ = "@dscharnitzky"
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__copyright__ = "Copyright 2020, GoldenPogácsa Team"
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__module_name__ = "consumerlocator"
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__version__text__ = "1"
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class ConsumerLocator:
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"""
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Manages the list of consumers.
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"""
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def __init__(self, comm: communicator.Communicator):
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"""
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Initialize class.
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"""
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self.consumerList = [{"Host": "KnownHost", "State": True, "LastOk": datetime.datetime.now()}]
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self.currentConsumer = self.consumerList[0]["Host"]
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self.communicator = comm
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def learnconsumerlist(self):
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""""
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Learns the list of consumers.
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"""
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recievedConsumerList = self.communicator.discoveravailableconsumers()
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for consumer in recievedConsumerList:
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self.consumerList.append({"Host": consumer, "State": True, "LastOk": datetime.datetime.now()})
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self.updateConsumerList()
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def updateconsumerlist(self):
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"""
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Updates the consumer list based on their availability.
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"""
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removeList = []
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for consumer in self.consumerList:
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if not self.communicator.checkconsumer(consumer["Host"]):
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consumer["State"] = False
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if datetime.datetime.now() - consumer["LastOk"] > datetime.timedelta(hours=1):
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removeList.append(consumer)
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else:
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consumer["LastOk"] = datetime.datetime.now()
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for rem in removeList:
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self.consumerList.remove(rem)
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def updateconsumer(self):
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"""
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Checks all the consumers in the list and updates the current consumer if necessary.
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:return: the current consumer or None if there are no available customers at the moment.
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"""
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self.updateConsumerList()
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if not self.checkConsumer():
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newCurrentConsumer = None
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for consumer in self.consumerList:
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if consumer["State"]:
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newCurrentConsumer = consumer
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break
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self.currentConsumer = newCurrentConsumer
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if self.currentConsumer is not None:
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return self.currentConsumer["Host"]
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else:
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return None
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def getcurrentconsumer(self):
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"""
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Returns the currently selected consumer.
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:return: the current consumer
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"""
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return self.currentConsumer["Host"]
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def checkcurrentconsumer(self):
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"""
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Check the consumers health.
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:return: True if OK, False if fail
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"""
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if self.communicator.checkconsumer(self.currentConsumer["Host"]):
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return True
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else:
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return False
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