remove blockchain fork detection threshold
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82c2c22a6e
commit
bf7deaa1fb
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@ -62,26 +62,30 @@ def hash_header(header):
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class Blockchain(util.PrintError):
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'''Manages blockchain headers and their verification'''
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def __init__(self, config, checkpoint):
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def __init__(self, config, filename, fork_point):
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self.config = config
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self.checkpoint = checkpoint
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self.filename = 'blockchain_headers' if checkpoint == 0 else 'blockchain_fork_%d'%checkpoint
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self.set_local_height()
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self.filename = filename
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self.catch_up = None # interface catching up
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if fork_point is None:
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self.is_saved = True
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self.checkpoint = int(filename[16:]) if filename.startswith('blockchain_fork_') else 0
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else:
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self.is_saved = False
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self.checkpoint = fork_point
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self.headers = []
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self.set_local_height()
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def height(self):
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return self.local_height
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return self.local_height + len(self.headers)
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def verify_header(self, header, prev_header, bits, target):
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prev_hash = hash_header(prev_header)
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_hash = hash_header(header)
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if prev_hash != header.get('prev_block_hash'):
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raise BaseException("prev hash mismatch: %s vs %s" % (prev_hash, header.get('prev_block_hash')))
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#if not self.pass_checkpoint(header):
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# raise BaseException('failed checkpoint')
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#if self.checkpoint_height == header.get('block_height'):
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# self.print_error("validated checkpoint", self.checkpoint_height)
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if bitcoin.TESTNET:
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return
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if bits != header.get('bits'):
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@ -115,24 +119,50 @@ class Blockchain(util.PrintError):
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return os.path.join(d, self.filename)
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def save_chunk(self, index, chunk):
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if not self.is_saved:
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self.fork_and_save()
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filename = self.path()
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f = open(filename, 'rb+')
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f.seek(index * 2016 * 80)
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f.truncate()
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h = f.write(chunk)
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f.close()
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with open(filename, 'rb+') as f:
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f.seek(index * 2016 * 80)
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f.truncate()
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h = f.write(chunk)
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self.set_local_height()
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def fork_and_save(self):
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import shutil
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self.print_error("save fork")
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height = self.checkpoint
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filename = "blockchain_fork_%d"%height
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new_path = os.path.join(util.get_headers_dir(self.config), filename)
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shutil.copy(self.path(), new_path)
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with open(new_path, 'rb+') as f:
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f.seek((height) * 80)
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f.truncate()
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self.filename = filename
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self.is_saved = True
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for h in self.headers:
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self.write_header(h)
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self.headers = []
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def save_header(self, header):
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height = header.get('block_height')
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if not self.is_saved:
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assert height == self.checkpoint + len(self.headers) + 1
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self.headers.append(header)
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if len(self.headers) > 10:
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self.fork_and_save()
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return
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self.write_header(header)
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def write_header(self, header):
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height = header.get('block_height')
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data = serialize_header(header).decode('hex')
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assert len(data) == 80
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height = header.get('block_height')
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filename = self.path()
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f = open(filename, 'rb+')
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f.seek(height * 80)
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f.truncate()
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h = f.write(data)
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f.close()
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with open(filename, 'rb+') as f:
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f.seek(height * 80)
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f.truncate()
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h = f.write(data)
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self.set_local_height()
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def set_local_height(self):
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@ -143,15 +173,22 @@ class Blockchain(util.PrintError):
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if self.local_height != h:
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self.local_height = h
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def read_header(self, block_height):
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def read_header(self, height):
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if not self.is_saved and height >= self.checkpoint:
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i = height - self.checkpoint
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if i >= len(self.headers):
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return None
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header = self.headers[i]
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assert header.get('block_height') == height
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return header
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name = self.path()
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if os.path.exists(name):
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f = open(name, 'rb')
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f.seek(block_height * 80)
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f.seek(height * 80)
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h = f.read(80)
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f.close()
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if len(h) == 80:
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h = deserialize_header(h, block_height)
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h = deserialize_header(h, height)
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return h
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def get_hash(self, height):
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@ -173,17 +210,6 @@ class Blockchain(util.PrintError):
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f.truncate()
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f.close()
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def fork(self, height):
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import shutil
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filename = "blockchain_fork_%d"%height
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new_path = os.path.join(util.get_headers_dir(self.config), filename)
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shutil.copy(self.path(), new_path)
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with open(new_path, 'rb+') as f:
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f.seek((height) * 80)
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f.truncate()
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f.close()
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return filename
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def get_target(self, index, chain=None):
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if bitcoin.TESTNET:
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return 0, 0
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@ -205,13 +205,12 @@ class Network(util.DaemonThread):
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config = {} # Do not use mutables as default values!
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util.DaemonThread.__init__(self)
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self.config = SimpleConfig(config) if type(config) == type({}) else config
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self.num_server = 8 if not self.config.get('oneserver') else 0
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self.blockchains = { 0:Blockchain(self.config, 0) }
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self.num_server = 18 if not self.config.get('oneserver') else 0
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self.blockchains = { 0:Blockchain(self.config, 'blockchain_headers', None) }
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for x in os.listdir(self.config.path):
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if x.startswith('blockchain_fork_'):
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n = int(x[16:])
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b = Blockchain(self.config, n)
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self.blockchains[n] = b
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b = Blockchain(self.config, x, None)
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self.blockchains[b.checkpoint] = b
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self.print_error("blockchains", self.blockchains.keys())
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self.blockchain_index = config.get('blockchain_index', 0)
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if self.blockchain_index not in self.blockchains.keys():
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@ -864,23 +863,16 @@ class Network(util.DaemonThread):
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if interface.bad != interface.good + 1:
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next_height = (interface.bad + interface.good) // 2
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else:
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interface.print_error("found connection at %d"% interface.good)
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delta1 = interface.blockchain.height() - interface.good
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delta2 = interface.tip - interface.good
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threshold = self.config.get('fork_threshold', 5)
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if delta1 > threshold and delta2 > threshold:
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interface.print_error("chain split detected: %d (%d %d)"% (interface.good, delta1, delta2))
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interface.blockchain.fork(interface.bad)
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interface.blockchain = Blockchain(self.config, interface.bad)
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self.blockchains[interface.bad] = interface.blockchain
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if interface.blockchain.catch_up is None:
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interface.blockchain.catch_up = interface.server
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interface.print_error("catching up")
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interface.mode = 'catch_up'
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next_height = interface.good
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else:
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# todo: if current catch_up is too slow, queue others
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next_height = None
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interface.print_error("chain split detected at %d"%interface.good, delta1, delta2)
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interface.blockchain = Blockchain(self.config, False, interface.bad)
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interface.blockchain.catch_up = interface.server
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self.blockchains[interface.bad] = interface.blockchain
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interface.print_error("catching up")
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interface.mode = 'catch_up'
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next_height = interface.good
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elif interface.mode == 'catch_up':
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if can_connect:
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interface.blockchain.save_header(header)
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