-
Notifications
You must be signed in to change notification settings - Fork 0
/
vote.py
213 lines (169 loc) · 6.03 KB
/
vote.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
import argparse
import random
import socket
import threading
import time
from uuid import uuid4
import requests
from flask import Flask, jsonify, request
from votechain import VoteChain
# Instantiate the node
app = Flask(__name__)
# Generate a globally unique address for this node
node_identifier = str(uuid4()).replace('-', '')
# Instantiate the Blockchain
votechain = VoteChain()
@app.route('/mine', methods=['GET'])
def mine():
votechain.resolve_conflicts()
if len(votechain.current_transactions) == 0:
response = {'message': 'No transactions to add to the block'}
return jsonify(response), 200
# We run the proof of work algorithm to get the next proof
last_block = votechain.last_block
last_proof = last_block.proof
proof = votechain.proof_of_work(last_proof)
# In general, the person who mined this block should be awarded a coin
# However, in this scheme, only government appointment nodes would allow
# voter registration. Therefore, there is no need to award anyone a coin
# Forge the new Block by adding it to the chain
previous_hash = votechain.hash(last_block)
replaced = votechain.resolve_conflicts()
if replaced:
response = {
'message':
'Chain has been altered by the addition of another block.'
}
return jsonify(response), 500
block = votechain.new_block(proof, previous_hash)
response = {
'message': "New Block Forged",
'index': block.index,
'transactions': [t.to_dictionary() for t in block.transactions],
'transaction_hashes': list(block.transaction_hashes),
'proof': block.proof,
'previous_hash': block.previous_hash,
}
return jsonify(response), 200
@app.route('/vote/new', methods=['POST'])
def new_transaction():
values = request.get_json()
# Check that the required fields are in the POST'ed data
required = ['voter_id', 'vote']
if not all(k in values for k in required):
return ('Missing values, voting should have "voter_id" and "vote"',
400)
votechain.resolve_conflicts()
for block in votechain.chain:
for transaction in block.transactions:
if values['voter_id'] == transaction.voter_id:
error_msg = 'You have already voted.'
return jsonify({'message': error_msg}), 404
voter_node = random.choice(list(votechain.voter_nodes))
response = requests.get('%s/chain' % voter_node)
if not response.ok:
error_msg = 'Not able to communicate with voter registration nodes'
return jsonify({'message': error_msg}), 500
chain = response.json()
if not identifier_in_chain(values['voter_id'], chain):
error_msg = 'Voter with id %s is not registered' % values['voter_id']
return jsonify({'message': error_msg}), 404
current_identifier = 0
while votechain.valid_proof(values['voter_id'], values['vote'],
current_identifier) is False:
current_identifier += 1
# Create a new Transaction
index = votechain.new_transaction(
voter_id=values['voter_id'],
vote=values['vote'],
verifier=current_identifier)
response = {
'message': f'Your vote will be recorded to Block {index}',
'identifier': current_identifier
}
return jsonify(response), 201
@app.route('/chain', methods=['GET'])
def full_chain():
response = {
'chain': votechain.serialize_chain(),
'length': len(votechain.chain),
}
return jsonify(response), 200
@app.route('/nodes/register', methods=['POST'])
def register_nodes():
values = request.get_json()
nodes = values.get('nodes')
if nodes is None:
return jsonify({
"error": "Error: Please supply a valid list of nodes"
}), 400
for node in nodes:
votechain.register_node(node)
response = {
'message': 'New nodes have been added',
'total_nodes': list(votechain.nodes),
}
return jsonify(response), 201
@app.route('/nodes/resolve', methods=['GET'])
def consensus():
replaced = votechain.resolve_conflicts()
if replaced:
response = {
'message': 'Our chain was replaced',
'new_chain': votechain.serialize_chain()
}
else:
response = {
'message': 'Our chain is authoritative',
'chain': votechain.serialize_chain()
}
return jsonify(response), 200
@app.route('/ping', methods=['GET'])
def ping():
response = {'healthy': True}
return jsonify(response), 200
@app.route('/nodes', methods=['GET'])
def get_nodes():
nodes = list(votechain.nodes.union({my_addr}))
return jsonify({'nodes': nodes}), 200
@app.route('/voter_nodes/register', methods=['POST'])
def register_voter_nodes():
values = request.get_json()
nodes = values.get('nodes')
if nodes is None:
return jsonify({
"error": "Error: Please supply a valid list of nodes"
}), 400
for node in nodes:
votechain.register_voter_node(node)
response = {
'message': 'New nodes have been added',
'total_nodes': list(votechain.voter_nodes),
}
return jsonify(response), 201
def background_mining(interval=15):
while True:
time.sleep(interval)
requests.get('%s/mine' % my_addr)
def identifier_in_chain(identifier, chain):
for block in chain['chain']:
for transaction in block['transactions']:
if str(transaction['verifier']) == str(identifier):
return True
return False
if __name__ == '__main__':
parser = argparse.ArgumentParser()
parser.add_argument(
'-p',
'--port',
help='Port to run on',
default=5000,
type=int,
required=False)
args = parser.parse_args()
my_ip = socket.gethostbyname(socket.gethostname())
port = args.port
my_addr = f'http://{my_ip}:{port}'
mining_thread = threading.Thread(target=background_mining)
mining_thread.start()
app.run(host='0.0.0.0', port=args.port, threaded=True)