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network: fix fork detection in certain backward search cases

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if there are no checkpoints and the split is very old, the exponential backward search might undershoot so that it asks for the genesis block but 0 and None are not distinguished hence the fork detection logic fails
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SomberNight 2018-06-26 16:56:30 +02:00
parent 5a5502303f
commit 4dcefa7d3b
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1 changed files with 1 additions and 1 deletions
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lib/network.py
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@ -974,7 +974,7 @@ class Network(util.DaemonThread):
else:
raise Exception(interface.mode)
# If not finished, get the next header
if next_height:
if next_height is not None:
if interface.mode == 'catch_up' and interface.tip > next_height + 50:
self.request_chunk(interface, next_height // 2016)
else: