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281 | #!/usr/bin/python
__author__='''
Suraj Singh bisht
surajsinghbisht054@gmail.com
www.bitforestinfo.com
github.com/surajsinghbisht054
'''
#
# import modules
import json
import os
from hashlib import sha256
from Crypto.PublicKey import RSA
from Crypto.Signature import PKCS1_v1_5
import time
# Simple Request Transection
class RequestTransection:
def __init__(self):
'''
'''
self.category = ''
self.sender = ''
self.receiver = ''
self.amount = ''
self.time = str(time.time())
self.fee = ''
self.sign = ''
self.pubkey = ''
self.prvkey = ''
self.rsa_key = ''
def getitems(self):
return {
"category" : self.category,
"sender" : self.sender,
"receiver" : self.receiver,
"amount" : self.amount,
"fee" : self.fee,
"sign" : self.sign,
"time" : self.time,
}
def __repr__(self):
return "< Transection {} | {} >".format(self.category, self.time)
def new_user(self):
random = RSA.Random.new().read
self.rsa_key = RSA.generate(512, random)
self.prvkey = self.rsa_key.exportKey() # private key object
self.pubkey = self.rsa_key.publickey().exportKey() # public key object
self.create_transection("n", '', )
return
def create_transection(self, category, sender, receiver, amount, fee):
category = category.lower()
if category not in ['new', 'send', 'receive']:
raise "please use valid categories like new, send or receive"
self.category = category
self.sender = sender
self.receiver = receiver
self.amount = amount
self.fee = fee
return
def previous_block_hash(self, blockitemdict):
return sha256("{index}{previoushash}{timestamp}{hash}{datahash}{nonce}{targetbit}".format(**blockitemdict)).hexdigest()
# In[62]:
class RequestBlock:
def __init__(self, index, previoushash, targetbit=3, transbuffer = []):
self.index = index
self.previoushash = previoushash
self.timestamp = str(time.time())
self.targetbit = targetbit
self.hash = ''
self.datahash = ''
self.dataload = []
self.nonce = ''
self.transbuffer = transbuffer
self.calculate_block()
def previous_block_hash(self, blockitemdict):
return sha256("{index}{previoushash}{timestamp}{hash}{datahash}{nonce}{targetbit}".format(**blockitemdict)).hexdigest()
def merkle_hash(self):
hl1 = []
hl2 = []
for data in self.dataload:
#print data.getitem()
hl1.append(sha256("{category}{sender}{receiver}{amount}{fee}{sign}{time}".format(**data.getitems())).hexdigest())
if not hl1:
return sha256('').hexdigest()
while True:
v1 = ''
v2 = ''
hl2 = []
if int(len(hl1) % 2)==0 and len(hl1)>1:
# Even Number's List
for h in hl1:
if not v1:
v1 = h
continue
v2 = h
hl2.append(sha256(v1+v2).hexdigest())
v1 = ''
v2 = ''
elif int(len(hl1) % 2)==1 and len(hl1)>1:
hl2 = hl1
hl2.append('')
elif len(hl1)==1:
return hl1[0]
else:
return False
hl1 = hl2
return False
def calculate_block(self):
# load transections from Node Buffer
self.load_data_from_network_buffer()
tmp = self.merkle_hash()
if not tmp:
print "[Note] No Data load Found"
self.datahash = tmp
return
def load_data_from_network_buffer(self):
for trans_req in self.transbuffer:
if trans_req not in self.dataload:
self.dataload.append(trans_req)
return
def getitems(self):
return {
"index" : self.index,
"previoushash": self.previoushash,
"timestamp" : self.timestamp,
"targetbit" : self.targetbit,
"hash" : self.hash,
"datahash" : self.datahash,
"dataload" : [i.getitems() for i in self.dataload],
"nonce" : self.nonce,
}
class MineBlock:
def __init__(self):
self.pow = False
self.block = ''
self.difficulty = 0
def load(self, block):
self.block = block
self.difficulty = int(self.block.targetbit)
self.proof_of_work_number_generator()
self.pow = True
return
def getblock(self):
return self.block
def getitems(self):
return self.block.getitems()
def previous_block_hash(self, blockitemdict):
return sha256("{index}{previoushash}{timestamp}{hash}{datahash}{nonce}{targetbit}".format(**blockitemdict)).hexdigest()
def proof_of_work_number_generator(self):
self.block.nonce = 0
while sha256("{}{}{}{}{}".format(self.block.previoushash,self.block.datahash,self.block.timestamp,self.block.targetbit,self.block.nonce)).hexdigest()[:self.difficulty]!='0'*self.difficulty:
self.block.nonce+= 1
self.block.hash = sha256("{}{}{}{}{}".format(self.block.previoushash,self.block.datahash,self.block.timestamp,self.block.targetbit,self.block.nonce)).hexdigest()
return self.block.nonce
class SimpleBlockChain:
def __init__(self, dbname='ChainStore.json'):
self.dbname = dbname
# Check BlockChain Json Storage File
if os.path.exists(self.dbname):
self.chain = json.load(open(self.dbname, 'r'))
else:
self.chain = {
"blockchain": [],
'lastupdate': time.time(),
}
# Check BlockChain Status
if not self.check_chain_len():
# Add Genesis Block
self.add_genesis_block()
# add genesis block request
def add_genesis_block(self):
print "Add Genesis Block Request"
tmpobj = RequestBlock(1,0)
mineblock = MineBlock()
mineblock.load(tmpobj)
self.new_block_request(mineblock.getblock())
return
# New Blocking Join Request
def new_block_request(self, block):
# Verify Block
if self.validate_new_block(block):
self.chain['blockchain'].append(block.getitems())
pass
return
# Validate New Block Before Joining It to main Chain
def validate_new_block(self, block):
return True
# Check block chain length
def check_chain_len(self):
return len(self.chain['blockchain'])
def pre_block(self):
return self.chain['blockchain'][-1]
#return
# save updates
def close(self):
f = open(self.dbname, 'w')
self.chain['lastupdate']= time.time()
json.dump(self.chain, f, sort_keys=True, indent=4, separators=(',', ': '))
f.close()
return
if __name__=='__main__':
sbc = SimpleBlockChain()
trans = RequestTransection()
trans.create_transection("send", "123456", "654231", '0', '500')
print trans.previous_block_hash(sbc.pre_block())
reqblock = RequestBlock(index=sbc.check_chain_len()+1, previoushash=trans.previous_block_hash(sbc.pre_block()), transbuffer=[trans])
m = MineBlock()
m.load(reqblock)
sbc.new_block_request(block=m.getblock())
print sbc.chain
sbc.close()
|
