def blockchain_three_blocks():
blockchain = Blockchain()
for i in range(3):
blockchain.add_block(i)
return blockchain
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_blockchain_instance():
blockchain = Blockchain()
assert blockchain.chain[0].hash == GENESIS_DATA['hash']
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(blockchain_three_blocks):
blockchain = Blockchain()
blockchain.replace_chain(blockchain_three_blocks.chain)
assert blockchain.chain == blockchain_three_blocks.chain
def test_is_valid_chain_bad_genesis(blockchain_three_blocks):
blockchain_three_blocks.chain[0].hash = 'evil_hash'
with pytest.raises(Exception, match='The genesis block must be valid'):
Blockchain.is_valid_chain(blockchain_three_blocks.chain)
def test_is_valid_chain(blockchain_three_blocks):
Blockchain.is_valid_chain(blockchain_three_blocks.chain)
def test_add_block():
blockchain = Blockchain()
data = 'test-data'
blockchain.add_block(data)
assert blockchain.chain[-1].data == data
from backend.blockchain.Blockchain import Blockchain
from backend.config import SECONDS
import time
blockchain = Blockchain()
times = []
for i in range(1000):
start_time = time.time_ns()
blockchain.add_block(i)
end_time = time.time_ns()
time_to_mine = (end_time - start_time) / SECONDS
times.append(time_to_mine)
average_time = sum(times) / len(times)
print(f'New block difficulty: {blockchain.chain[-1].difficulty}')
print(f'Time to mine new block: {time_to_mine}s')
print(f'Average time to add blocks: {average_time}s\n')
import os
import random
import requests
from flask import Flask, jsonify, request
from backend.blockchain.Blockchain import Blockchain
from backend.wallet.wallet import Wallet
from backend.wallet.transaction import Transaction
from backend.wallet.transaction_pool import TransactionPool
from backend.pubsub import PubSub
app = Flask(__name__)
blockchain = Blockchain()
wallet = Wallet()
transaction_pool = TransactionPool()
pubsub = PubSub(blockchain, transaction_pool)
# for i in range(3):
# blockchain.add_block(i)
@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():
blockchain.add_block(transaction_pool.transaction_data())
block = blockchain.chain[-1]