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 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)
def consensus():
replaced = blockchain.resolve_conflicts()
if replaced:
response = {
"message": "Our chain was replaced",
"new_chain": blockchain.chain
}
else:
response = {
"message": "Our chain is authoritative",
"chain": blockchain.chain
}
return jsonify(response)
def full_chain():
# Resolve conflicts before returning full blockchain data
blockchain.resolve_conflicts()
# Return all blockchain data
return jsonify(blockchain.chain)