def transaction():
form=TransactionForm()
# current_user.balance=10000
# db.session.commit()
if form.validate_on_submit():
The_one=User.query.filter_by(username=form.receiver.data).first()
The_two=User.query.filter_by(username=form.sender.data).first()
if current_user.balance>=int(form.amount.data) and int(form.amount.data)>0 and current_user.balance>=0 and The_one!=None and The_two!=None and The_two.username==current_user.username :
amount=form.amount.data
data=str(form.sender.data)+str(form.receiver.data)
block=Block(number=amount,data=data)
blockchain=Blockchain()
blockchain.mine_block(block)
block_=Block_(amount=amount,data=data,hash=block.hash(),nonce=block.nonce,previous_hash=block.previous_hash)
db.session.add(block_)
db.session.commit()
flash("Your transaction is Successfull!")
for ock in Block_.query.all():
if ock.id!=1:
ock.previous_hash=a
db.session.commit()
a=ock.hash
current_user.balance-=int(form.amount.data)
The_one.balance+=int(form.amount.data)
# for testing purpose current_user.balance=10000
db.session.commit()
else:
flash('Transaction not granted')
return render_template('transaction.html',form=form)
def test_add_block_invalid(self):
block = Block(self.blockchain.latest_block.index,
self.blockchain.latest_block.hash,
datetime.utcnow().timestamp(), 'new-block', None)
block.hash = Blockchain.calculate_hash_for_block(block)
self.blockchain.add_block(block)
self.assertNotEqual(block, self.blockchain.latest_block)
def create_genesis_block(self):
"""
A function to generate genesis block and appends it to
the chain. The block has index 0, previous_hash as 0, and
a valid hash.
"""
genesis_block = Block(0, [], time.time(), "0")
genesis_block.hash = genesis_block.compute_hash()
self.chain.append(genesis_block)
def block_serializer(data):
block = Block(index=data['index'])
for transaction in data['transactions']:
block.add_transaction(sender=transaction['sender'],
receiver=transaction['receiver'],
amount=transaction['amount'],
timestamp=transaction['timestamp'],
thash=transaction['hash'])
block.hash = data['hash']
return block
def chain_deserializer(chain_json):
chain = []
for block_json in chain_json:
transactions = transactions_deserializer(block_json['transactions'])
block_to_append = Block(block_json['timestamp'], transactions,
block_json['prev_hash'])
block_to_append.nonce = block_json['nonce']
block_to_append.hash = block_json['hash']
chain.append(block_to_append)
return chain
