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interface: fix only-genesis regtest case

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SomberNight 2018-12-10 17:46:37 +01:00
parent 5b9b6a931d
commit 0ddccd56c7
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1 changed files with 5 additions and 2 deletions
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7
electrum/interface.py
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@ -438,14 +438,17 @@ class Interface(PrintError):
return last, height
async def step(self, height, header=None):
assert height != 0
assert height <= self.tip, (height, self.tip)
assert 0 <= height <= self.tip, (height, self.tip)
if header is None:
header = await self.get_block_header(height, 'catchup')
chain = blockchain.check_header(header) if 'mock' not in header else header['mock']['check'](header)
if chain:
self.blockchain = chain if isinstance(chain, Blockchain) else self.blockchain
# note: there is an edge case here that is not handled.
# we might know the blockhash (enough for check_header) but
# not have the header itself. e.g. regtest chain with only genesis.
# this situation resolves itself on the next block
return 'catchup', height+1
can_connect = blockchain.can_connect(header) if 'mock' not in header else header['mock']['connect'](height)