def __init__(self):
self.NODE_ID = None
self.NODE_NAME = None
self.NODE_TYPE = None
self.setup_node()
# Create the blockchain instance for this node if one doesn't exist
if not os.path.exists("blockchain.pickle"):
self.blockchain = Blockchain.instance(node_id=self.NODE_ID, node_name=self.NODE_NAME,
node_type=self.NODE_TYPE)
print("First time booting! Creating genesis block...")
self.blockchain.create_genesis()
else:
print("Successfully identified blockchain on this device. Loading into memory...")
loaded_blockchain = self.load_blockchain()
loaded_pending_transactions = self.load_pending_transactions()
self.blockchain = Blockchain.instance(loaded_blockchain, loaded_pending_transactions, self.NODE_ID,
self.NODE_NAME, self.NODE_TYPE)
API.instance()
Consensus.instance(self.NODE_NAME)
self.node_comm = Communication.instance(self.NODE_ID, self.NODE_NAME, self.blockchain, self.NODE_TYPE)
self.blockchain.set_communication(self.node_comm)
print(self.NODE_ID, self.NODE_NAME)
# Send a connection request to other distributor nodes in network
if self.NODE_TYPE == 'DISTRIBUTOR':
self.node_comm.notify_connection('connect')
def __addshipment(self, params):
if len(params) == 0 or params[0] in ["?", "HELP"]:
self.__show_command_help(
usage="addshipment id srclocation destlocation qty",
description="Enters a shipment into the network."
)
elif len(params) == 3:
shipment_id = params[0]
src = params[1]
dest = params[2]
qty = params[3]
confirmation = input(
"Are you sure you want to add this shipment to the blockchain? This action is irreversible without the agreement of all network nodes (y/n): ").upper()
if confirmation == "Y":
print("\nAdding to blockchain...")
blockchain = Blockchain.instance()
self.node_comm = Communication.instance()
transaction = blockchain.create_distributor_transaction(shipment_id, blockchain.get_node_id(), src, dest, qty,
blockchain.get_node_type(),
blockchain.get_node_name())
self.node_comm.broadcast_transaction(transaction)
print("Shipment is now pending.\n> ", end="")
def request_shipment():
response = jsonify(success=False, status_code=500)
if request.method == "POST":
dest = request.form["dest-location"]
qty = request.form["qty"]
distributor = request.form["distributor"]
print("\nAdding to blockchain...")
blockchain = Blockchain.instance()
node_comm = Communication.instance()
transaction = blockchain.create_client_transaction(
blockchain.get_node_name(), dest, qty, distributor,
blockchain.get_node_type())
node_comm.broadcast_transaction(transaction)
print("Request has been received and is now pending.\n> ", end="")
response = jsonify(success=True, status_code=200)
return response
def add_shipment():
response = jsonify(success=False, status_code=500)
if request.method == "POST":
shipment_id = request.form["shipment-id"]
src = request.form["src-location"]
dest = request.form["dest-location"]
qty = request.form["qty"]
print("\nAdding to blockchain...")
blockchain = Blockchain.instance()
node_comm = Communication.instance()
transaction = blockchain.create_distributor_transaction(
shipment_id, blockchain.get_node_id(), src, dest, qty,
blockchain.get_node_type(), blockchain.get_node_name())
node_comm.broadcast_transaction(transaction)
print("Shipment is now pending.\n> ", end="")
response = jsonify(success=True, status_code=200)
return response
def __requestshipment(self, params):
if len(params) == 0 or params[0] in ["?", "HELP"]:
self.__show_command_help(
usage="requestshipment destlocation qty distributor",
description="Requests a shipment of vaccines from a given distributor."
)
elif len(params) == 3:
dest = params[0]
qty = params[1]
distributor = params[2]
confirmation = input(
"Are you sure you want to request this shipment? This action is irreversible without the agreement of all network nodes (y/n): ").upper()
if confirmation == "Y":
print("\nAdding to blockchain...")
blockchain = Blockchain.instance()
self.node_comm = Communication.instance()
transaction = blockchain.create_client_transaction(blockchain.get_node_name(), dest, qty, distributor, blockchain.get_node_type())
self.node_comm.broadcast_transaction(transaction)
print("Request has been received and is now pending.\n> ", end="")
