63 lines
1.7 KiB
Python
63 lines
1.7 KiB
Python
from decimal import Decimal
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class Offer:
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"""A rate offer to download blobs from a host."""
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RATE_ACCEPTED = "RATE_ACCEPTED"
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RATE_TOO_LOW = "RATE_TOO_LOW"
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RATE_UNSET = "RATE_UNSET"
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def __init__(self, offer):
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self._state = None
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self.rate = None
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if isinstance(offer, Decimal):
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self.rate = round(offer, 5)
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elif isinstance(offer, float):
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self.rate = round(Decimal(offer), 5)
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if self.rate is None or self.rate < Decimal(0.0):
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self.unset()
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@property
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def is_accepted(self):
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return self._state is Offer.RATE_ACCEPTED
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@property
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def is_too_low(self):
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return self._state is Offer.RATE_TOO_LOW
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@property
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def is_unset(self):
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return self._state is Offer.RATE_UNSET
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@property
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def message(self):
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if self.is_accepted:
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return Offer.RATE_ACCEPTED
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elif self.is_too_low:
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return Offer.RATE_TOO_LOW
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elif self.is_unset:
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return Offer.RATE_UNSET
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return None
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def accept(self):
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if self.is_unset or self._state is None:
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self._state = Offer.RATE_ACCEPTED
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def reject(self):
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if self.is_unset or self._state is None:
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self._state = Offer.RATE_TOO_LOW
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def unset(self):
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self._state = Offer.RATE_UNSET
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def handle(self, reply_message):
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if reply_message == Offer.RATE_TOO_LOW:
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self.reject()
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elif reply_message == Offer.RATE_ACCEPTED:
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self.accept()
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elif reply_message == Offer.RATE_UNSET:
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self.unset()
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else:
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raise Exception("Unknown offer reply %s" % str(reply_message))
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