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fix #4401

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SomberNight 2018-06-03 17:17:56 +02:00
parent 3031f594cb
commit 219c2a363a
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1 changed files with 11 additions and 1 deletions
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12
lib/blockchain.py
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@ -30,6 +30,11 @@ from .bitcoin import *
MAX_TARGET = 0x00000000FFFF0000000000000000000000000000000000000000000000000000 MAX_TARGET = 0x00000000FFFF0000000000000000000000000000000000000000000000000000
class MissingHeader(Exception):
pass
def serialize_header(res): def serialize_header(res):
s = int_to_hex(res.get('version'), 4) \ s = int_to_hex(res.get('version'), 4) \
+ rev_hex(res.get('prev_block_hash')) \ + rev_hex(res.get('prev_block_hash')) \
@ -300,6 +305,8 @@ class Blockchain(util.PrintError):
# new target # new target
first = self.read_header(index * 2016) first = self.read_header(index * 2016)
last = self.read_header(index * 2016 + 2015) last = self.read_header(index * 2016 + 2015)
if not first or not last:
raise MissingHeader()
bits = last.get('bits') bits = last.get('bits')
target = self.bits_to_target(bits) target = self.bits_to_target(bits)
nActualTimespan = last.get('timestamp') - first.get('timestamp') nActualTimespan = last.get('timestamp') - first.get('timestamp')
@ -343,7 +350,10 @@ class Blockchain(util.PrintError):
return False return False
if prev_hash != header.get('prev_block_hash'): if prev_hash != header.get('prev_block_hash'):
return False return False
target = self.get_target(height // 2016 - 1) try:
target = self.get_target(height // 2016 - 1)
except MissingHeader:
return False
try: try:
self.verify_header(header, prev_hash, target) self.verify_header(header, prev_hash, target)
except BaseException as e: except BaseException as e: