POW 共识算法API接口实现

POW/pow_api.py

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+from flask import Flask, jsonify, request
+from uuid import uuid4
+from blockChain import Blockchain
+
+# Instantiate our Node
+app = Flask(__name__)
+
+# Generate a globally unique address for this node
+node_identifier = str(uuid4()).replace('-', '')
+
+# Instantiate the Blockchain
+blockchain = Blockchain()
+
+
+@app.route('/mine', methods=['GET'])
+def mine():
+    # run the PoW algo
+    last_block = blockchain.last_block
+    last_proof = last_block['proof']
+    proof = blockchain.proof_of_work(last_proof)
+    
+    # get reward for solving a block
+    blockchain.new_transaction(sender="0", recipient=node_identifier, amount=1)
+    
+    # add a new block to the chain
+    previous_hash = blockchain.hash(last_block)
+    block = blockchain.new_block(proof, previous_hash)
+    
+    # create response
+    response = {
+        'message': "New block forged",
+        'index': block['index'],
+        'transactions': block['transactions'],
+        'proof': block['proof'],
+        'previous_hash': block['previous_hash']
+    }
+    
+    # return response
+    return jsonify(response), 200
+
+
+@app.route('/transactions/new', methods=['POST'])
+def new_transaction():
+    # get values from request
+    values = request.get_json()
+    
+    # verify all values are present
+    required = ['sender', 'recipient', 'amount']
+    if not all(k in values for k in required):
+        return "Missing values", 400
+    
+    # create a new transaction
+    index = blockchain.new_transaction(values['sender'], values['recipient'], values['amount'])
+    
+    # create and return response
+    response = {'message': f'Transaction will be added to Block {index}'}
+    return jsonify(response), 200
+
+
+# return the full chain
+@app.route('/chain', methods=['GET'])
+def full_chain():
+    response = {
+        'chain': blockchain.chain,
+        'length': len(blockchain.chain),
+    }
+    return jsonify(response), 200
+
+
+# create a new node
+@app.route('/nodes/register', methods=['POST'])
+def register_nodes():
+    values = request.get_json()
+    
+    nodes = values.get('nodes')
+    if nodes is None:
+        return "Error: Please supply a valid list of nodes", 400
+    
+    for node in nodes:
+        blockchain.register_node(node)
+    
+    response = {
+        'message': 'New nodes have been added',
+        'total_nodes': list(blockchain.nodes),
+    }
+    return jsonify(response), 201
+
+
+# consensus algo
+@app.route('/nodes/resolve', methods=['GET'])
+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), 200
+
+
+if __name__ == '__main__':
+    # app.run(host='0.0.0.0', port=5000)
+    from argparse import ArgumentParser
+    
+    parser = ArgumentParser()
+    parser.add_argument('-p', '--port', default=6000, type=int, help='Listening on port')
+    args = parser.parse_args()
+    port = args.port
+    app.run(host='0.0.0.0', port=port)