def FH(self, data): # Fetch Block Headerhash
data = int(data)
if 0 < data <= self.factory.chain.height():
mini_block = {}
logger.info(
'<<<Pushing block headerhash of block number %s to node: %s',
str(data),
self.transport.getPeer().host)
mini_block['headerhash'] = self.factory.chain.m_get_block(
data).blockheader.headerhash
mini_block['blocknumber'] = data
self.transport.write(
self.wrap_message('PH', helper.json_bytestream_ph(mini_block)))
else:
if data > self.factory.chain.height():
logger.info(
'FH for a blocknumber is greater than the local chain length..'
)
return
def create(self, blocknumber, xmss, slave_public_key, hashchain_terminator=None, first_hash=None, balance=None):
"""
:param blocknumber:
:type blocknumber:
:param xmss:
:type xmss:
:param slave_public_key:
:type slave_public_key:
:param hashchain_terminator:
:type hashchain_terminator:
:param first_hash:
:type first_hash:
:param balance:
:type balance:
:return:
:rtype:
>>> s = StakeTransaction()
>>> slave = XMSS(4)
>>> isinstance(s.create(0, XMSS(4), slave.pk(), None, slave.pk(), 10), StakeTransaction)
True
"""
if not balance:
logger.info('Invalid Balance %d', balance)
raise Exception
self.slave_public_key = slave_public_key
self.epoch = blocknumber // config.dev.blocks_per_epoch # in this block the epoch is..
self.first_hash = first_hash
self.balance = balance
if hashchain_terminator is None:
self.hash = hashchain_reveal(xmss.get_seed_private(), epoch=self.epoch + 1)
else:
self.hash = hashchain_terminator
tmphash = ''.join([bin2hstr(b) for b in self.hash])
if self.first_hash is None:
self.first_hash = tuple()
self.txhash = str2bin(tmphash + bin2hstr(self.first_hash) + bin2hstr(self.slave_public_key))
self._process_XMSS(xmss.get_address(), self.txhash, xmss) # self.hash to be replaced with self.txhash
return self
def PB(self, data):
"""
Push Block
This function processes requested blocks received while syncing.
Block received under this function are directly added to the main
chain i.e. chain.m_blockchain
It is expected to receive only one block for a given blocknumber.
:return:
"""
self.factory.pos.last_pb_time = time.time()
try:
if self.isNoMoreBlock(data):
return
block = Block.from_json(data)
blocknumber = block.blockheader.blocknumber
logger.info('>>> Received Block #%d', blocknumber)
if blocknumber != self.last_requested_blocknum:
logger.warning('Did not match %s %s',
self.last_requested_blocknum,
self.conn_identity)
return
if blocknumber > self.factory.chain.height():
if not self.factory.chain.add_block_mainchain(block):
logger.warning('PB failed to add block to mainchain')
return
try:
reactor.download_monitor.cancel()
except Exception as e:
logger.warning("PB: %s", e)
self.factory.pos.randomize_block_fetch(blocknumber + 1)
except Exception as e:
logger.error(
'block rejected - unable to decode serialised data %s',
self.transport.getPeer().host)
logger.exception(e)
return
def prepare_winners(self, our_reveal, last_block_number):
if not self.nodeState.state == NState.synced:
return
filtered_reveal_one = []
reveals = []
vote_hashes = []
next_block_num = last_block_number + 1
for s in self.chain.stake_reveal_one:
tmp_strongest_headerhash = self.chain.block_chain_buffer.get_strongest_headerhash(last_block_number)
if s[1] == tmp_strongest_headerhash and s[2] == next_block_num:
filtered_reveal_one.append(s)
reveals.append(s[3])
vote_hashes.append(s[5])
self.restart_post_block_logic(30)
if len(filtered_reveal_one) <= 1:
logger.info('only received one reveal for this block.. blocknum #%s', next_block_num)
return
epoch = next_block_num / config.dev.blocks_per_epoch # +1 = next block
seed = self.chain.block_chain_buffer.get_epoch_seed(next_block_num)
winners = self.chain.select_winners(filtered_reveal_one,
topN=3,
seed=seed)
# reactor.process_blocks = reactor.callLater(30, process_blocks, winners=winners, our_reveal=our_reveal)
if not (self.p2pFactory.stake and our_reveal):
return
if our_reveal in winners:
block = self.create_new_block(our_reveal,
reveals,
vote_hashes,
last_block_number)
self.pre_block_logic(block) # broadcast this block
if self.chain.pending_tx_pool:
if len(self.chain.transaction_pool) < 10:
logger.info('Processing TXNs if any')
self.process_transactions(5)
def m_add_block(self, block_obj, verify_block_reveal_list=True):
if len(self.m_blockchain) == 0:
self.m_read_chain()
if block_obj.validate_block(
chain=self,
verify_block_reveal_list=verify_block_reveal_list) is True:
if self.state.state_add_block(self, block_obj) is True:
self.m_blockchain.append(block_obj)
self.remove_tx_in_block_from_pool(block_obj)
else:
logger.info(
'last block failed state/stake checks, removed from chain')
self.state.state_validate_tx_pool(self)
return False
else:
logger.info('m_add_block failed - block failed validation.')
return False
self.m_f_sync_chain()
return True
def select_winners(self, reveals, topN=1, blocknumber=None, block=None, seed=None):
# FIXME: This is POS related
winners = None
if not seed:
logger.info('Exception raised due to Seed is None')
raise Exception
if blocknumber:
winners = heapq.nsmallest(topN, reveals, key=lambda reveal: self.score(
stake_address=self.get_sv(self.reveal_to_terminator(reveal, blocknumber, add_loop=1)),
reveal_one=reveal,
balance=self.block_chain_buffer.get_st_balance(
self.get_sv(self.reveal_to_terminator(reveal, blocknumber, add_loop=1)), blocknumber),
seed=seed)) # blocknumber+1 as we have one extra hash for the reveal
return winners
winners = heapq.nsmallest(topN, reveals, key=lambda reveal: reveal[4]) # reveal[4] is score
winners_dict = {}
for winner in winners:
winners_dict[winner[3]] = winner # winner[3] is reveal_one
return winners_dict
def f_write_m_blockchain(self):
blocknumber = self.m_blockchain[-1].blockheader.blocknumber
file_epoch = int(blocknumber // config.dev.blocks_per_chain_file)
writeable = self.m_blockchain[-config.dev.disk_writes_after_x_blocks:]
logger.info('Appending data to chain')
with open(self.get_chaindatafile(file_epoch), 'ab') as myfile:
for block in writeable:
jsonBlock = bytes(json_bytestream(block), 'utf-8')
compressedBlock = bz2.compress(jsonBlock,
config.dev.compression_level)
pos = myfile.tell()
blockSize = len(compressedBlock)
self.update_block_metadata(block.blockheader.blocknumber, pos,
blockSize)
myfile.write(compressedBlock)
myfile.write(config.dev.binary_file_delimiter)
del self.m_blockchain[:-1]
gc.collect()
def validate_tx(self):
if not self.validate_subtype(self.subtype, TX_SUBTYPE_STAKE):
return False
if not helper.isValidAddress(self.txfrom):
logger.info('Invalid From Address %s', self.txfrom)
return False
if self.first_hash:
if sha256(self.first_hash) != self.hash[-1]:
logger.info('First_hash doesnt stake to hashterminator')
return False
for i in range(len(self.hash)):
self.hash[i] = str(self.hash[i])
if not self.validate_signed_hash():
return False
return True
def recv_peers(self, json_data):
if not config.user.enable_peer_discovery:
return
data = helper.json_decode(json_data)
new_ips = []
for ip in data:
if ip not in new_ips:
new_ips.append(ip.encode('latin1'))
peer_addresses = self.factory.peer_addresses
logger.info('%s peers data received: %s',
self.transport.getPeer().host, new_ips)
for node in new_ips:
if node not in peer_addresses:
if node != self.transport.getHost().host:
peer_addresses.append(node)
reactor.connectTCP(node, 9000, self.factory)
self.factory.update_peer_addresses(peer_addresses)
return
def next_stakers(self, data=None):
logger.info('<<< API next_stakers call')
next_stakers = {'status': 'ok',
'stake_list': []}
for staker in self.factory.state.stake_validators_list.next_sv_list:
sv = self.factory.state.stake_validators_list.next_sv_list[staker]
tmp_stakers = {'address': sv.stake_validator,
'balance': self.factory.format_qrlamount(sv.balance),
'hash_terminator': [],
'nonce': sv.nonce}
for i in range(len(sv.hashchain_terminators)):
tmp_stakers['hash_terminator'].append(bin2hstr(sv.hashchain_terminators[i]))
next_stakers['stake_list'].append(tmp_stakers)
return json_print_telnet(next_stakers)
def LB(self): # request for last block to be sent
"""
Last BLock
Sends the last block from the main chain.
:return:
"""
logger.info(
'<<<Sending last block %s %s bytes to node %s',
self.factory.chain.m_blockheight(),
str(
len(
helper.json_bytestream(
self.factory.chain.m_get_last_block()))),
self.transport.getPeer().host)
self.transport.write(
self.wrap_message(
'BK',
helper.json_bytestream_bk(
self.factory.chain.m_get_last_block())))
return
def connect_peers(self):
"""
Will connect to all known peers. This is typically the entry point
It does result in:
- connectionMade in each protocol (session)
- :py:meth:startedConnecting
- :py:meth:clientConnectionFailed
- :py:meth:clientConnectionLost
:return:
:rtype: None
"""
logger.info('<<<Reconnecting to peer list: %s', self.peer_addresses)
for peer in self.peer_addresses:
found = False
for peer_conn in self.peer_connections:
if peer == peer_conn.transport.getPeer().host:
found = True
break
if found:
continue
reactor.connectTCP(peer, 9000, self)
def BK(self, data): # block received
try:
block = Block.from_json(data)
except Exception as e:
logger.error(
'block rejected - unable to decode serialised data %s',
self.transport.getPeer().host)
logger.exception(e)
return
logger.info('>>>Received block from %s %s %s', self.identity,
block.blockheader.blocknumber,
block.blockheader.stake_selector)
if not self.factory.master_mr.isRequested(block.blockheader.headerhash,
self):
return
self.factory.pos.pre_block_logic(block, self.identity)
self.factory.master_mr.register(block.blockheader.headerhash, data,
'BK')
self.broadcast(block.blockheader.headerhash, 'BK')
return
def m_verify_chain_250(
self,
verbose=0
): # validate the last 250 blocks or len(m_blockchain)-1..
n = 0
if len(self.m_blockchain) > 250:
x = 250
else:
if len(self.m_blockchain) == 1:
return True
x = len(self.m_blockchain) - 1
for block in self.m_read_chain()[-x:]:
if self.validate_block(block, verbose=verbose) is False:
logger.info(('block failed:', block.blockheader.blocknumber))
return False
n += 1
if verbose is 1:
sys.stdout.write('.')
sys.stdout.flush()
return True
def f_load_winfo(self):
try:
with open(self.wallet_info_filename, 'r') as myfile:
data = pickle.load(myfile)
except Exception as e:
logger.exception(e)
logger.info('Likely no wallet.info found, creating..')
self.f_save_winfo()
return False
x = 0
for tree in self.chain.my:
# if any part of self.chain.my which has loaded from f_read_wallet()
# on startup is lower than winfo then don't load..
if not isinstance(tree[1], list):
if tree[1].get_index() <= data[x][3]:
tree[1].set_index(data[x][3]) # update self.chain.my from winfo then save to main file..
else:
return False
x += 1
self.f_save_wallet()
return True
def monitor_bk(self):
time_diff = time.time() - self.last_pos_cycle
if (self.nodeState.state == NState.synced
or self.nodeState.state == NState.unsynced) and 90 < time_diff:
if self.nodeState.state == NState.synced:
self.stop_post_block_logic()
self.reset_everything()
self.update_node_state(NState.unsynced)
self.epoch_diff = -1
elif time.time() - self.last_bk_time > 120:
self.last_pos_cycle = time.time()
logger.info(' POS cycle activated by monitor_bk() ')
self.update_node_state(NState.synced)
if self.nodeState.state == NState.syncing and time.time(
) - self.last_pb_time > 60:
self.stop_post_block_logic()
self.reset_everything()
self.update_node_state(NState.unsynced)
self.epoch_diff = -1
reactor.monitor_bk = reactor.callLater(60, self.monitor_bk)
def validate_tx(self):
if self.subtype != TX_SUBTYPE_TX:
return False
# sanity check: this is not how the economy is supposed to work!
if self.amount <= 0:
logger.info('State validation failed for %s because negative or zero', self.txhash)
logger.info('Amount %d', self.amount)
return False
txhash = sha256(''.join(self.txfrom + self.txto + str(self.amount) + str(self.fee)))
txhash = sha256(txhash + self.pubhash)
# cryptographic checks
if self.txhash != txhash:
return False
if not self.validate_signed_hash():
return False
return True
def process_transactions(self, num):
tmp_num = num
for tx in self.chain.pending_tx_pool:
tmp_num -= 1
tx_peer = tx[1]
tx = tx[0]
if not tx.validate_tx():
logger.info('>>>TX %s failed validate_tx', tx.txhash)
continue
block_chain_buffer = self.chain.block_chain_buffer
tx_state = block_chain_buffer.get_stxn_state(blocknumber=block_chain_buffer.height(),
addr=tx.txfrom)
isValidState = tx.state_validate_tx(
tx_state=tx_state,
transaction_pool=self.chain.transaction_pool
)
if not isValidState:
logger.info('>>>TX %s failed state_validate', tx.txhash)
continue
logger.info('>>>TX - %s from - %s relaying..', tx.txhash, tx_peer.transport.getPeer().host)
self.chain.add_tx_to_pool(tx)
txn_msg = tx_peer.wrap_message('TX', tx.transaction_to_json())
for peer in tx_peer.factory.peer_connections:
if peer != tx_peer:
peer.transport.write(txn_msg)
for i in range(num - tmp_num):
del self.chain.pending_tx_pool[0]
del self.chain.pending_tx_pool_hash[0]
def BM(
self,
data=None
): # blockheight map for synchronisation and error correction prior to POS cycle resync..
if not data:
logger.info('<<< Sending block_map %s',
self.transport.getPeer().host)
z = {
'block_number':
self.factory.chain.m_blockchain[-1].blockheader.blocknumber,
'headerhash':
self.factory.chain.m_blockchain[-1].blockheader.headerhash
}
self.transport.write(self.wrap_message('BM',
helper.json_encode(z)))
return
else:
logger.info('>>> Receiving block_map')
z = helper.json_decode(data)
block_number = z['block_number']
headerhash = z['headerhash'].encode('latin1')
i = [block_number, headerhash, self.transport.getPeer().host]
logger.info('%s', i)
if i not in self.factory.chain.blockheight_map:
self.factory.chain.blockheight_map.append(i)
return
def search_txhash(self, txhash): # txhash is unique due to nonce.
err = {
'status': 'Error',
'error': 'txhash not found',
'method': 'txhash',
'parameter': txhash
}
for tx in self.factory.chain.transaction_pool:
if tx.txhash == txhash:
logger.info('%s found in transaction pool..', txhash)
tx_new = copy.deepcopy(tx)
self.reformat_txn(tx_new)
return json_print_telnet(tx_new)
try:
txn_metadata = self.factory.chain.state.db.get(txhash)
except:
logger.info(
'%s does not exist in memory pool or local blockchain..',
txhash)
return json_print_telnet(err)
json_tx = json.loads(txn_metadata[0])
tx = Transaction().from_txdict(json_tx)
tx_new = copy.deepcopy(tx)
self.reformat_txn(tx_new)
logger.info('%s found in block %s', txhash, str(txn_metadata[1]))
tx_new.status = 'ok'
return json_print_telnet(tx_new)
def last_unconfirmed_tx(self, data=None):
logger.info('<<< API last_unconfirmed_tx call')
addr = {'transactions': []}
error = {
'status': 'error',
'error': 'invalid argument',
'method': 'last_tx',
'parameter': data
}
if not data:
data = 1
try:
n = int(data)
except:
return json_print_telnet(error)
if n <= 0 or n > 20:
return json_print_telnet(error)
tx_num = len(self.factory.chain.transaction_pool)
while tx_num > 0:
tx_num -= 1
tx = self.factory.chain.transaction_pool[tx_num]
if tx.subtype != TX_SUBTYPE_TX:
continue
tmp_txn = {
'txhash': bin2hstr(tx.txhash),
'block': 'unconfirmed',
'timestamp': 'unconfirmed',
'amount': self._format_qrlamount(tx.amount),
'type': tx.subtype
}
tmp_txn['type'] = Transaction.tx_id_to_name(tmp_txn['type'])
addr['transactions'].append(tmp_txn)
addr['status'] = 'ok'
return json_print_telnet(addr)
def BM(self, data=None): # blockheight map for synchronisation and error correction prior to POS cycle resync..
"""
Blockheight Map
Simply maps the peer with their respective blockheight.
If no data is provided in parameter, the node sends its
own current blockheight.
:return:
"""
if not data:
logger.info('<<< Sending block_map %s', self.transport.getPeer().host)
z = {'block_number': self.factory.chain.m_blockchain[-1].blockheader.blocknumber,
'headerhash': self.factory.chain.m_blockchain[-1].blockheader.headerhash}
self.transport.write(self.wrap_message('BM', helper.json_encode(z)))
return
else:
logger.info('>>> Receiving block_map')
z = helper.json_decode(data)
block_number = z['block_number']
headerhash = z['headerhash'].encode('latin1')
i = [block_number, headerhash, self.transport.getPeer().host]
logger.info('%s', i)
if i not in self.factory.chain.blockheight_map:
self.factory.chain.blockheight_map.append(i)
return
def __next__(self):
if not self.pending_tx_pool:
raise StopIteration
if len(self.transaction_pool) >= config.dev.transaction_pool_size:
raise StopIteration
tx = self.pending_tx_pool.pop(0)
tx_peer = tx[1]
tx = tx[0]
if not tx.validate_tx():
logger.info('>>>TX %s failed validate_tx', tx.txhash)
return False
tx_state = self.block_chain_buffer.get_stxn_state(
blocknumber=self.block_chain_buffer.height(), addr=tx.txfrom)
isValidState = tx.state_validate_tx(
tx_state=tx_state, transaction_pool=self.transaction_pool)
if not isValidState:
logger.info('>>>TX %s failed state_validate', tx.txhash)
return False
logger.info('A TXN has been Processed %s', bin2hstr(tx.txhash))
self.add_tx_to_pool(tx)
return True
def BN(self, data): # request for block (n)
"""Block(n)
Sends the nth block from mainchain.
:return:
"""
if int(data) <= self.factory.chain.m_blockheight():
logger.info(
'<<<Sending block number %s %s bytes to node: %s', int(data),
len(
helper.json_bytestream(
self.factory.chain.m_get_block(int(data)))),
self.transport.getPeer().host)
self.transport.write(
self.wrap_message(
'BK',
helper.json_bytestream_bk(
self.factory.chain.m_get_block(int(data)))))
else:
if int(data) >= self.factory.chain.m_blockheight():
logger.info(
'BN for a blockheight greater than local chain length..')
else:
logger.info(
'BN request without valid block number %s - closing connection',
str(data))
self.transport.loseConnection()
return
def process_transactions(self, num):
tmp_num = num
for tx in self.buffered_chain.tx_pool.pending_tx_pool:
tmp_num -= 1
tx_peer = tx[1]
tx = tx[0]
if not tx.validate():
logger.info('>>>TX %s failed validate_tx', tx.txhash)
continue
tx_state = self.buffered_chain.get_stxn_state(
blocknumber=self.buffered_chain.height, addr=tx.txfrom)
is_valid_state = tx.validate_extended(
tx_state=tx_state,
transaction_pool=self.buffered_chain.tx_pool.transaction_pool)
if not is_valid_state:
logger.info('>>>TX %s failed state_validate', tx.txhash)
continue
logger.info('>>>TX - %s from - %s relaying..', tx.txhash,
tx_peer.transport.getPeer().host)
self.buffered_chain.tx_pool.add_tx_to_pool(tx)
txn_msg = tx_peer.wrap_message('TX', tx.to_json())
for peer in tx_peer.factory.peer_connections:
if peer != tx_peer:
# FIXME: Breaks encapsulation
peer.transport.write(txn_msg)
for i in range(num - tmp_num):
del self.buffered_chain.tx_pool.pending_tx_pool[0]
del self.buffered_chain.tx_pool.pending_tx_pool_hash[0]
def reboot(self, data):
hash_dict = json.loads(data)
if not ('hash' in hash_dict and 'nonce' in hash_dict
and 'blocknumber' in hash_dict):
return
status, error = self.factory.chain.validate_reboot(
hash_dict['hash'], hash_dict['nonce'])
if not status:
logger.info('status %s', status)
logger.info('error %s', error)
return
for peer in self.factory.peers:
if peer != self:
peer.transport.write(self.wrap_message('reboot', data))
reboot_data = [
'2920c8ec34f04f59b7df4284a4b41ca8cbec82ccdde331dd2d64cc89156af653',
hash_dict['nonce']
]
self.factory.chain.state.db.put('reboot_data', reboot_data)
blocknumber = hash_dict['blocknumber']
logger.info('Initiating Reboot Sequence..... #%s', blocknumber)
if blocknumber != 0:
if blocknumber <= self.factory.chain.height():
self.factory.pos.update_node_state(NState.unsynced)
del self.factory.chain.m_blockchain[blocknumber:]
self.factory.chain.f_write_m_blockchain()
self.factory.chain.m_load_chain()
self.factory.pos.update_node_state(NState.synced)
def create_tree(self):
num_branches = 0
if self.num_leaves <= 2: # catch case for which log doesn't do the job
num_branches = 1
elif self.num_leaves <= 512:
num_branches = int(ceil(log(self.num_leaves, 2)))
self.num_branches = num_branches
self.tree.append(self.base)
hashlayer = self.base
temp_array = []
for x in range(
num_branches
): # iterate through each layer of the merkle tree starting with the base layer
temp_array = []
cycles = len(hashlayer) % 2 + len(hashlayer) / 2
y = 0
# FIXME: Same variable as outer loop??
for _ in range(cycles):
if y + 1 == len(hashlayer):
temp_array.append(str(hashlayer[y]))
else:
temp_array.append(
sha256(str(hashlayer[y]) + str(hashlayer[y + 1])))
y = y + 2
self.tree.append(temp_array)
hashlayer = temp_array
self.root = temp_array
self.height = len(self.tree)
if self.verbose == 1:
logger.info('Merkle tree created with %d leaves, %d branches',
self.num_leaves, self.num_branches)
return self.tree
def last_tx(self, data=None):
logger.info('<<< API last_tx call')
if not data:
data = 1
addr = {'transactions': []}
error = {'status': 'error', 'error': 'invalid argument', 'method': 'last_tx', 'parameter': data}
try:
n = int(data)
except:
return json_print_telnet(error)
if n <= 0 or n > 20:
return json_print_telnet(error)
try:
last_txn = self.factory.state.db.get('last_txn')
except Exception:
error['error'] = 'txnhash not found'
return json_print_telnet(error)
n = min(len(last_txn), n)
while n > 0:
n -= 1
tx_meta = last_txn[n]
tx = SimpleTransaction().json_to_transaction(tx_meta[0])
tmp_txn = {'txhash': bin2hstr(tx.txhash),
'block': tx_meta[1],
'timestamp': tx_meta[2],
'amount': self.factory.format_qrlamount(tx.amount),
'type': tx.subtype}
addr['transactions'].append(tmp_txn)
addr['status'] = 'ok'
return json_print_telnet(addr)
def get_st_balance(self, stake_address, blocknumber):
if stake_address is None:
logger.error('stake address should not be none, returning None')
return None
try:
if blocknumber - 1 == self.chain.height():
if stake_address in self.state.stake_validators_list.sv_list:
return self.state.stake_validators_list.sv_list[
stake_address].balance
logger.info('Blocknumber not found')
return None
return self.blocks[
blocknumber -
1][1].stake_validators_list.sv_list[stake_address].balance
except KeyError:
self.error_msg('get_st_balance', blocknumber)
except Exception as e:
self.error_msg('get_st_balance', blocknumber, e)
return None
def monitor_bk(self):
# FIXME: Too complex.. too many nested ifs
time_diff = time.time() - self.last_pos_cycle
if (self.sync_state.state == ESyncState.synced or self.sync_state.state == ESyncState.unsynced) and \
90 < time_diff:
if self.sync_state.state == ESyncState.synced:
self.stop_post_block_logic()
self.update_node_state(ESyncState.unsynced)
self.epoch_diff = -1
elif time.time() - self.last_bk_time > 120:
self.last_pos_cycle = time.time()
logger.info(' POS cycle activated by monitor_bk() ')
self.update_node_state(ESyncState.synced)
if self.sync_state.state == ESyncState.syncing and time.time(
) - self.last_pb_time > 60:
self.stop_post_block_logic()
self.update_node_state(ESyncState.unsynced)
self.epoch_diff = -1
reactor.monitor_bk = reactor.callLater(60, self.monitor_bk)