def test_transaction_chain(clone_blockchain):
Blockchain.is_tx_chain_valid(clone_blockchain.chain)
def test_valid_transaction_chain(blockchain_three_blocks):
Blockchain.is_valid_transaction_chain(blockchain_three_blocks.chain)
def test_blockchain_instance():
blockchain = Blockchain()
assert blockchain.chain[0].hash == GENESIS_DATA['hash']
def test_is_valid_chain_bad_genesis(blockchain_three_blocks):
blockchain_three_blocks.chain[0].hash = 'evil_hash'
with pytest.raises(Exception, match='genesis block must be valid'):
Blockchain.is_valid_chain(blockchain_three_blocks.chain)
def test_replace_chain_not_longer(blockchain_three_blocks):
blockchain = Blockchain()
with pytest.raises(Exception, match='The incoming chain must be longer'):
blockchain_three_blocks.replace_chain(blockchain.chain)
def test_replace_chain_bad_chain(blockchain):
old_blockchain = Blockchain()
blockchain.chain[1].data = 'evil_hash'
with raises(Exception, match='Invalid incoming chain'):
old_blockchain.replace_chain(blockchain.chain)
def blockchain_three_blocks():
blockchain = Blockchain()
for i in range(3):
blockchain.add_block([Transaction(Wallet(), 'recipient', i).to_json()])
return blockchain
def test_is_valid_chain(blockchain_with_blocks):
Blockchain.is_valid_chain(blockchain_with_blocks.chain)
def test_is_valid_chain_invalid_genesis(blockchain_with_blocks):
blockchain_with_blocks.chain[0].hash = 3000
with pytest.raises(Exception, match="genesis block is invalid"):
Blockchain.is_valid_chain(blockchain_with_blocks.chain)
def test_add_block():
blockchain = Blockchain()
data = "test data"
blockchain.add_block(data)
assert blockchain.chain[-1].data == data
def blockchain_with_blocks():
blockchain = Blockchain()
for i in range(5):
blockchain.add_block(f"block #{i}")
return blockchain
def test_wallet_starting_balance(): wallet = Wallet() blockchain = Blockchain() assert Wallet.calculate_balance(blockchain, wallet.address) == STARTING_BALANCE
import os
import requests
import random
from flask import Flask, jsonify
from backend.blockchain.blockchain import Blockchain
from backend.pubsub import PubSub
app = Flask(__name__)
blockchain = Blockchain()
pubsub = PubSub(blockchain)
@app.route('/')
def route_default():
return 'Welcome to the blockchain'
@app.route('/blockchain')
def route_blockchain():
return jsonify(blockchain.to_json())
@app.route('/blockchain/mine')
def route_blockchain_mine():
transaction_data = 'stubbed_transcation_data'
blockchain.add_block(transaction_data)
block = blockchain.chain[-1]
pubsub.broadcast_block(block)
return jsonify(block.to_json())
def test_transaction_chain_when_duplicate_tx(clone_blockchain):
tx_instance = Transaction(Wallet(), "b13b2bf4", 1).serialize_to_json()
clone_blockchain.add_block([tx_instance, tx_instance])
with pytest.raises(Exception, match="is not unique;"):
Blockchain.is_tx_chain_valid(clone_blockchain.chain)
def test_replace_chain(blockchain):
old_blockchain = Blockchain()
old_blockchain.replace_chain(blockchain.chain)
assert old_blockchain.chain == blockchain.chain
def test_blockchain():
blockchain = Blockchain()
assert blockchain.chain[0].hash == GENESIS_DATA["hash"]
def test_replace_chain_too_short(blockchain):
old_blockchain = Blockchain()
with raises(Exception, match='Incoming chain must be longer'):
blockchain.replace_chain(old_blockchain.chain)
def test_replace_chain_invalid_chain(blockchain_with_blocks):
blockchain = Blockchain()
blockchain_with_blocks.chain[2].hash = "tampered_hash"
with pytest.raises(Exception, match="chain is not valid"):
blockchain.replace_chain(blockchain_with_blocks.chain)
def test_add_block():
blockchain = Blockchain()
data = 'test-data'
blockchain.add_block(data)
assert blockchain.chain[-1].data == data
import os
import requests
import random
from flask import Flask, jsonify, request
from flask_cors import CORS
from backend.blockchain.blockchain import Blockchain
from backend.wallet.transaction import Transaction
from backend.wallet.transaction_pool import TransactionPool
from backend.wallet.wallet import Wallet
from backend.pubsub import PubSub
app = Flask(__name__)
CORS(app, resources={r'/*': {'origins': 'http://*****:*****@app.route('/')
def route_default():
return 'Welcome to the blockchain'
@app.route('/blockchain')
def route_blockchain():
return jsonify(blockchain.to_json())
def test_is_valid_chain(blockchain_three_blocks):
Blockchain.is_valid_chain(blockchain_three_blocks.chain)
def blockchain_three_blocks():
blockchain = Blockchain()
for i in range(3):
blockchain.add_block(i)
return blockchain
def test_replace_chain(blockchain_three_blocks):
blockchain = Blockchain()
blockchain.replace_chain(blockchain_three_blocks.chain)
assert blockchain.chain == blockchain_three_blocks.chain
import time
from backend.blockchain.blockchain import Blockchain
from backend.config import TIME_S
blockchain = Blockchain()
times = []
for i in range(1000):
start_time = time.time_ns() / TIME_S
blockchain.add_block(i)
end_time = time.time_ns() / TIME_S
mine_time = end_time - start_time
times.append(mine_time)
average_time = sum(times) / len(times)
print(f"Block No: {i}")
print(f"last_block_difficulty: {blockchain.chain[-1].difficulty}")
print(f"last_block_nonce: {blockchain.chain[-1].nonce}")
print(f"last_block_hash: {blockchain.chain[-1].hash}")
print(f"Time to mine block: {mine_time} seconds")
print(f"Average_time: {average_time} seconds\n\n")
def test_replace_chain_bad_chain(blockchain_three_blocks):
blockchain = Blockchain()
blockchain_three_blocks.chain[1].hash = 'evil-hash'
with pytest.raises(Exception, match='The incoming chain is invalid'):
blockchain.replace_chain(blockchain_three_blocks.chain)
def test_is_valid_chain(blockchain):
Blockchain.is_valid_chain(blockchain.chain)
def test_is_valid_transaction_chain_duplicate_transactions(
blockchain_three_blocks):
transaction = Transaction(Wallet(), 'recipient', 1).to_json()
blockchain_three_blocks.add_block([transaction, transaction])
with pytest.raises(Exception, match='is not unique'):
Blockchain.is_valid_transaction_chain(blockchain_three_blocks.chain)
def test_is_valid_chain_bad_genesis(blockchain):
blockchain.chain[0].hash = 'evil_hash'
with raises(Exception, match='Invalid genesis block'):
Blockchain.is_valid_chain(blockchain.chain)
def test_is_valid_transaction_chain_multiple_rewards(blockchain_three_blocks):
reward_1 = Transaction.reward_transaction(Wallet()).to_json()
reward_2 = Transaction.reward_transaction(Wallet()).to_json()
blockchain_three_blocks.add_block([reward_1, reward_2])
with pytest.raises(Exception, match='one mining reward per block'):
Blockchain.is_valid_transaction_chain(blockchain_three_blocks.chain)
def test_surrogate_chain_when_invalid_chain(clone_blockchain):
blockchain = Blockchain()
clone_blockchain.chain[1].hash = "invalidate"
with pytest.raises(Exception, match="Invalid chain."):
blockchain.surrogate_chain(clone_blockchain.chain)
