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node.py
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node.py
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from flask import Flask, jsonify, request, send_from_directory
from flask_cors import CORS
from wallet import Wallet
from blockchain import Blockchain
app = Flask(__name__)
CORS(app)
@app.route('/', methods=['GET'])
def get_node_ui():
return send_from_directory('ui', 'node.html')
@app.route('/network', methods=['GET'])
def get_network_ui():
return send_from_directory('ui', 'network.html')
@app.route('/wallet', methods=['POST'])
def create_keys():
wallet.create_keys()
if wallet.save_keys():
global blockchain
blockchain = Blockchain(wallet.public_key, port)
response = {
'public_key': wallet.public_key,
'private_key': wallet.private_key,
'funds': blockchain.get_balance()
}
return jsonify(response), 201
else:
response = {
'message': 'Error in saving the keys.'
}
return jsonify(response), 500
@app.route('/wallet', methods=['GET'])
def load_keys():
if wallet.load_keys():
global blockchain
blockchain = Blockchain(wallet.public_key, port)
response = {
'public_key': wallet.public_key,
'private_key': wallet.private_key,
'funds': blockchain.get_balance()
}
return jsonify(response), 201
else:
response = {
'message': 'Error in loading keys.'
}
return jsonify(response), 500
@app.route('/balance', methods=['GET'])
def get_balance():
balance = blockchain.get_balance()
if balance is not None:
response = {
'message': 'Balance fetched successfully.',
'funds': balance
}
return jsonify(response), 200
else:
response = {
'messsage': 'Loading balance failed.',
'wallet_set_up': wallet.public_key is not None
}
return jsonify(response), 500
@app.route('/broadcast-transaction', methods=['POST'])
def broadcast_transaction():
values = request.get_json()
if not values:
response = {'message': 'No data found.'}
return jsonify(response), 400
required = ['sender', 'recipient', 'amount', 'signature']
if not all(key in values for key in required):
response = {'message': 'Some data is missing.'}
return jsonify(response), 400
success = blockchain.add_transaction(
values['recipient'],
values['sender'],
values['signature'],
values['amount'],
is_receiving=True)
if success:
response = {
'message': 'Transaction added successfully.',
'transaction': {
'sender': values['sender'],
'recipient': values['recipient'],
'amount': values['amount'],
'signature': values['signature']
}
}
return jsonify(response), 201
else:
response = {
'message': 'Creating a transaction failed.'
}
return jsonify(response), 500
@app.route('/broadcast-block', methods=['POST'])
def broadcast_block():
values = request.get_json()
if not values:
response = {'message': 'No data found.'}
return jsonify(response), 400
if 'block' not in values:
response = {'message': 'Some data is missing.'}
return jsonify(response), 400
block = values['block']
if block['index'] == blockchain.chain[-1].index + 1:
if blockchain.add_block(block):
response = {'message': 'Block added'}
return jsonify(response), 201
else:
response = {'message': 'Block seems invalid.'}
return jsonify(response), 409
elif block['index'] > blockchain.chain[-1].index:
response = {
'message': 'Blockchain differs from local blockchain.'}
blockchain.resolve_conflicts = True
return jsonify(response), 200
else:
response = {
'message': 'Blockchain shorter, block not added'}
return jsonify(response), 409
@app.route('/transaction', methods=['POST'])
def add_transaction():
if wallet.public_key is None:
response = {
'message': 'No wallet set up.'
}
return jsonify(response), 400
values = request.get_json()
if not values:
response = {
'message': 'No data found.'
}
return jsonify(response), 400
required_fields = ['recipient', 'amount']
if not all(field in values for field in required_fields):
response = {
'message': 'Required data is missing.'
}
return jsonify(response), 400
recipient = values['recipient']
amount = values['amount']
signature = wallet.sign_transaction(wallet.public_key, recipient, amount)
success = blockchain.add_transaction(
recipient, wallet.public_key, signature, amount)
if success:
response = {
'message': 'Transaction added successfully.',
'transaction': {
'sender': wallet.public_key,
'recipient': recipient,
'amount': amount,
'signature': signature
},
'funds': blockchain.get_balance()
}
return jsonify(response), 201
else:
response = {
'message': 'Creating a transaction failed.'
}
return jsonify(response), 500
@app.route('/mine', methods=['POST'])
def mine():
if blockchain.resolve_conflicts:
response = {'message': 'Block not added! Resolve conflicts first.'}
return jsonify(response), 409
block = blockchain.mine_block()
if block is not None:
dict_block = block.__dict__.copy()
dict_block['transactions'] = [
tx.__dict__ for tx in dict_block['transactions']]
response = {
'message': 'Block added successfully.',
'block': dict_block,
'funds': blockchain.get_balance()
}
return jsonify(response), 201
else:
response = {
'message': 'Adding a block failed.',
'wallet_set_up': wallet.public_key is not None
}
return jsonify(response), 500
@app.route('/resolve-conflicts', methods=['POST'])
def resolve_conflicts():
replaced = blockchain.resolve()
if replaced:
response = {'message': 'Chain replaced.'}
else:
response = {'message': 'Keeping local chain.'}
return jsonify(response), 200
@app.route('/transactions', methods=['GET'])
def get_open_transaction():
transactions = blockchain.get_open_transactions()
dict_transactions = [tx.__dict__ for tx in transactions]
return jsonify(dict_transactions), 200
@app.route('/chain', methods=['GET'])
def get_chain():
chain_snapshot = blockchain.chain
dict_chain = [block.__dict__.copy() for block in chain_snapshot]
for dict_block in dict_chain:
dict_block['transactions'] = [
tx.__dict__ for tx in dict_block['transactions']]
return jsonify(dict_chain), 200
@app.route('/node', methods=['POST'])
def add_node():
values = request.get_json()
if not values:
response = {
'message': 'No data attached.'
}
return jsonify(response), 400
if 'node' not in values:
response = {
'message': 'No node data found.'
}
return jsonify(response), 400
node = values['node']
blockchain.add_peer_node(node)
response = {
'message': 'Node added successfully.',
'all_nodes': blockchain.get_peer_nodes()
}
return jsonify(response), 201
@app.route('/node/<node_url>', methods=['DELETE'])
def remove_node(node_url):
if node_url == '' or node_url is None:
response = {
'message': 'No node found.'
}
return jsonify(response), 400
blockchain.remove_peer_node(node_url)
response = {
'message': 'Node removed',
'all_nodes': blockchain.get_peer_nodes()
}
return jsonify(response), 200
@app.route('/nodes', methods=['GET'])
def get_nodes():
nodes = blockchain.get_peer_nodes()
response = {
'all_nodes': nodes
}
return jsonify(response), 200
if __name__ == '__main__':
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument('-p', '--port', type=int, default=3000)
args = parser.parse_args()
port = args.port
wallet = Wallet(port)
blockchain = Blockchain(wallet.public_key, port)
app.run(host='0.0.0.0', port=port)