def create_purchase_transaction():
# Resolve chain conflicts before making changes
blockchain.resolve_conflicts()
# Run the proof of work algorithm to get the next proof
last_block = blockchain.last_block
proof = blockchain.proof_of_work(last_block)
# Get data from the URL request
values = request.get_json()
# Create a new transaction
blockchain.new_transaction({
"sender": values["sender"],
"recipient": node_identifier,
"amount": int(values["amount"]),
"type": "transaction"
})
# Forge the new block by adding it to the chain
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
response = {
"index": block["index"],
"transactions": block["transactions"],
"proof": block["proof"],
"previous_hash": block["previous_hash"],
}
return jsonify(response), 201
def mining():
# find new proof by previous proof
latest_block = blockchain.latest_block
prev_proof = latest_block[PROOF]
new_proof = blockchain.proof_of_work(prev_proof)
# get reward for found a proof
blockchain.add_new_transaction(
sender="0", # sender=0 means that recipient got an award
recipient=node_id,
total=1)
# create a new block, add to a chain
prev_hash = blockchain.hash_block(latest_block)
new_block = blockchain.add_block(new_proof, prev_hash)
resp = {
MESSAGE: "New Block created",
INDEX: new_block[INDEX],
TRANSACTIONS: new_block[TRANSACTIONS],
PROOF: new_block[PROOF],
PREV_HASH: new_block[PREV_HASH]
}
return jsonify(resp), 200
def mineBlock():
# We run the proof of work algorithm to get the next proof...
last_block = blockchain.last_block
proof = blockchain.proof_of_work(last_block)
# We must receive a reward for finding the proof.
# The sender is "0" to signify that this node has mined a new coin.
blockchain.new_transaction(
sender="0",
recipient=node_identifier,
amount=1,
)
# Forge the new Block by adding it to the chain
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
minedBlock = {
'message': "Congrats you mined and attached block",
'index': block['index'],
'transactions': block['transactions'],
'proof': block['proof'],
'previous_hash': block['previous_hash'],
}
return minedBlock
def create_user():
blockchain.resolve_conflicts()
# Run the proof of work algorithm to get the next proof
last_block = blockchain.last_block
proof = blockchain.proof_of_work(last_block)
# Generate a globally unique address for this user
user_identifier = str(uuid4()).replace("-", "")
# Retrieve user data from request
values = request.get_json()
name = values["name"]
# Add an initial amount to the new user's balance
blockchain.new_transaction({
"user_id": user_identifier,
"balance": 10,
"name": name,
"type": "new_user"
})
# Forge the new block by adding it to the chain
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
response = {
"index": block["index"],
"transactions": block["transactions"],
"proof": block["proof"],
"previous_hash": block["previous_hash"],
}
return jsonify(response)
def create_shelter():
# Resolve chain conflicts before making changes
blockchain.resolve_conflicts()
# Run the proof of work algorithm to get the next proof
last_block = blockchain.last_block
proof = blockchain.proof_of_work(last_block)
# Generate a globally unique address for this shelter
shelter_identifier = str(uuid4()).replace('-', '')
# Retrieve shelter data from request
values = request.get_json()
name = values["name"]
address = values["address"]
lat = float(values["lat"])
lng = float(values["lng"])
data = json.loads(values["data"])
# Create this shelter in the blockchain
blockchain.new_transaction({
"shelter_id": shelter_identifier,
"name": name,
"address": address,
"lat": lat,
"lng": lng,
"data": data,
"type": "new_shelter"
})
# Forge the new block by adding it to the chain
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
response = {
"index": block["index"],
"transactions": block["transactions"],
"proof": block["proof"],
"previous_hash": block["previous_hash"],
}
return jsonify(response)