python_abcrypto/node.py at master · manustays/python_abcrypto · GitHub

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fromflaskimportFlask, jsonify, request, send_from_directory
fromflask_corsimportCORS

fromwalletimportWallet
fromblockchainimportBlockchain


app=Flask(__name__)
CORS(app)

wallet=Wallet()
blockchain=Blockchain(wallet.public_key)


defresp(status_code=200, message='Success', data=None):
"""Helper function to return jsonified response"""
response= { 'message': message }
ifdata:
response.update(data)
returnjsonify(response), status_code


defvalidate_request_data(data, required_fields=None):
"""Helper function to validates the request data.
	returns None if data is valid, i.e., data is present and
	required_fields, if any, are also present.
	Otherwise, returns a jsonified response object
	with 400 status and an error message.

	Arguments:
 :data: Dictionary of request parameters to validate
 :required_fields: List of fields that are required to be present
	"""
ifnotdata:
returnresp(400, 'No data found')
ifrequired_fields:
ifnotall(fieldindataforfieldinrequired_fields):
returnresp(400, 'Required data is misssing')
returnNone


@app.route('/', methods=['GET'])
defget_ui():
returnsend_from_directory('ui', 'node.html')

@app.route('/network', methods=['GET'])
defget_network_ui():
returnsend_from_directory('ui', 'network.html')


@app.route('/transactions', methods=['GET'])
defget_transactions():
transactions=blockchain.get_open_transactions()
dict_transactions= [tx.to_dict() fortxintransactions]
returnjsonify(dict_transactions), 200


@app.route('/transaction', methods=['POST'])
defadd_transaction():
"""TODO: Validate input parameters"""
ifwallet.public_key==None:
returnresp(400, 'No wallet set up')

data=request.get_json()
required_fields= ['recipient', 'amount']
invalid_data_response=validate_request_data(data, required_fields)
ifinvalid_data_response:
returninvalid_data_response

recipient=data['recipient']
amount=data['amount']
signature=wallet.sign_transactions(wallet.public_key, recipient, amount)
success=blockchain.add_transaction(sender=wallet.public_key, recipient=recipient, amount=amount, signature=signature)
ifsuccess:
returnresp(201, 'Transaction added successfully.', {
'transaction': blockchain.get_open_transactions()[-1].to_dict(),
'balance': blockchain.get_balance()
 })
else:
returnresp(500, 'Failed to create a transaction')


@app.route('/broadcast-transaction', methods=['POST'])
defbroadcast_transaction():
"""Receive broadcast of newly added transactions from other nodes"""
data=request.get_json()
required_fields= ['sender', 'recipient', 'amount', 'signature']
invalid_data_response=validate_request_data(data, required_fields)
ifinvalid_data_response:
returninvalid_data_response

success=blockchain.add_transaction(sender=data['sender'], recipient=data['recipient'], amount=data['amount'], signature=data['signature'], is_receiving=True)
ifsuccess:
returnresp(201, 'Transaction added successfully.', {
'transaction': blockchain.get_open_transactions()[-1].to_dict(),
'balance': blockchain.get_balance()
 })
else:
returnresp(500, 'Failed to create a transaction.')


@app.route('/broadcast-block', methods=['POST'])
defbroadcast_block():
"""Receive broadcast of newly mined blocks from other nodes"""
data=request.get_json()
required_fields= ['block']
invalid_data_response=validate_request_data(data, required_fields)
ifinvalid_data_response:
returninvalid_data_response

block=data['block']
last_local_block_index=blockchain.get_last_block()['index']
ifblock['index'] ==last_local_block_index+1:
ifblockchain.add_block(block):
returnresp(201, 'Block added successfully.')
else:
returnresp(409, 'Block seems invalid.')	# Invalid data (conflict)
elifblock['index'] >last_local_block_index:
# TODO: Our chain is shorter.. We need to fix it!
blockchain.resolve_conflicts=True
returnresp(200, 'Bockchain seems to differ from local blockchain.')	# Not an error (Current node needs to fix the issue)
else:
# Our blockchain is more recent (has longer chain)
returnresp(409, 'Bockchain seems to be shorter. Block not added.') # Invalid data (conflict)


@app.route('/resolve-conflicts', methods=['POST'])
defresolve_conflicts():
replaced=blockchain.resolve()
ifreplaced:
returnresp(200, 'Chain was replaced.')
else:
returnresp(200, 'Local chain kept.')


@app.route('/wallet', methods=['POST'])
defcreate_keys():
wallet.create_keys()
ifwallet.save_keys():
globalblockchain
blockchain=Blockchain(wallet.public_key)
returnresp(201, '', {
'public_key': wallet.public_key,
'private_key': wallet.private_key,
'balance': blockchain.get_balance()
 })
else:
returnresp(500, 'Failed to save the wallet keys.')


@app.route('/wallet', methods=['GET'])
defload_keys():
ifwallet.load_keys():
globalblockchain
blockchain=Blockchain(wallet.public_key)
returnresp(200, '', {
'public_key': wallet.public_key,
'private_key': wallet.private_key,
'balance': blockchain.get_balance()
 })
else:
returnresp(500, 'Failed to load the wallet keys.')


@app.route('/balance', methods=['GET'])
defget_balance():
balance=blockchain.get_balance()
ifbalance!=None:
returnresp(200, 'Balance fetched successfully.', {
'balance': blockchain.get_balance()
 })
else:
returnresp(500, 'Failed to load balance.', {
'is_wallet_setup': wallet.public_key!=None
 })


@app.route('/mine', methods=['POST'])
defmine():
ifblockchain.resolve_conflicts:
returnresp(409, 'Block not added due to conflicts.')

block=blockchain.mine_block()
ifblock!=None:
returnresp(201, 'Mining successful. Block added.', {
'added_block': block.to_dict(),
'balance': blockchain.get_balance()
 })
else:
returnresp(500, 'Mining failed. Block not added.', {
'is_wallet_setup': wallet.public_key!=None
 })


@app.route('/chain', methods=['GET'])
defget_chain():
returnjsonify(blockchain.get_chain_dict()), 200


@app.route('/nodes', methods=['GET'])
defget_nodes():
returnresp(200, '', {
'peer_nodes': blockchain.get_peer_nodes()
 })


@app.route('/node', methods=['POST'])
defadd_node():
data=request.get_json()
required_fields= ['node']
invalid_data_response=validate_request_data(data, required_fields)
ifinvalid_data_response:
returninvalid_data_response

blockchain.add_peer_node(data['node'])
returnresp(201, 'Node added successfully.', {
'peer_nodes': blockchain.get_peer_nodes()
 })


@app.route('/node/<node_url>', methods=['DELETE'])
defremove_node(node_url):
ifnotnode_url:
returnresp(400, 'No node data found')
blockchain.remove_peer_node(node_url)
returnresp(200, 'Node removed successfully.', {
'peer_nodes': blockchain.get_peer_nodes()
 })


if__name__=='__main__':
fromargparseimportArgumentParser
parser=ArgumentParser()
parser.add_argument('-p', '--port', type=int, default=4000)
args=parser.parse_args()
app.run(host='127.0.0.1', port=args.port)