block.py

# coding=utf-8
from uuid import uuid4

from flask import Flask, jsonify, request

from blockchain import BlockChain

app = Flask(__name__)

node_identifier = str(uuid4()).replace('-', '')

blockchain = BlockChain()


@app.route('/')
def hello_world():
    return 'Hello World!'


@app.route('/mine', methods=['GET'])
def mine():
    # coinbase交易
    blockchain.new_transaction(sender='0', recipient=node_identifier, amount=50)
    block = blockchain.new_block()
    response = {
        'message': 'New Block Forged',
        'index': block['index'],
        'transactions': block['transactions'],
        'header': block['header'],
    }
    return jsonify(response), 200


@app.route('/transactions/new', methods=['POST'])
def new_transaction():
    values = request.get_json()
    required = ['sender', 'recipient', 'amount']
    if not all(k in values for k in required):
        return 'invalid parameters, parameter must be one of sender/recipient/amount', 400

    index = blockchain.new_transaction(values['sender'], values['recipient'], values['amount'])
    response = {'message': 'Transaction will be added to Block {0}'.format(index)}
    return jsonify(response), 201


@app.route('/chain', methods=['GET'])
def full_chain():
    response = {
        'chain': blockchain.chain,
        'length': len(blockchain.chain)
    }
    return jsonify(response), 200


if __name__ == '__main__':
    app.run()