def car_history_is_valid(self, car_id):
"""
car history is valid if
1. chain is valid
2. entries in data base match corresponding chain entries
3. the hashes that link the car history are valid
"""
if self.chain_is_valid():
client = DBConnect()
car_history = client.get_car_history(car_id)
for stage in car_history:
if stage != self.chain[stage["_id"]]:
return False
if len(car_history) <= 1:
return True
index = 1
while index < len(car_history):
if self.get_hash(
car_history[index -
1]) != car_history[index]["hash"]["car"]:
return False
index += 1
return True
else:
return False
def mine_block(self, block_type, block_data):
client = DBConnect()
last_block = self.csv_operator.get_last_block()
_id = self.csv_operator.get_chain_length()
car_id = block_data[0]
nonce = self.proof_of_work(last_block["nonce"])
last_hash_block = self.get_hash(last_block)
last_hash_car = "None"
if block_type == "Production":
block = {
"_id": _id,
"car_id": car_id,
"nonce": nonce,
"hash": {
"block": last_hash_block,
"car": last_hash_car
},
"details": {
"block_type": "Production"
}
}
elif block_type == "NewRegister":
block = {
"_id": _id,
"car_id": car_id,
"nonce": nonce,
"hash": {
"block": last_hash_block,
"car": last_hash_car
},
"details": {
"block_type": "NewRegister"
}
}
elif block_type == "Repair":
last_car_entry = client.get_car_history(car_id)[-1]
last_hash_car = self.get_hash(last_car_entry)
block = {
"_id": _id,
"car_id": car_id,
"nonce": nonce,
"hash": {
"block": last_hash_block,
"car": last_hash_car
},
"details": {
"block_type": "Repair",
}
}
elif block_type == "Sale":
last_car_entry = client.get_car_history(car_id)[-1]
last_hash_car = self.get_hash(last_car_entry)
block = {
"_id": _id,
"car_id": car_id,
"nonce": nonce,
"hash": {
"block": last_hash_block,
"car": last_hash_car
},
"details": {
"block_type": "Sale"
}
}
else:
return "wrong input"
client.ingest_block(block)
self.csv_operator.add_block(block)
