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blockchain
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Refactor and new features 

- Remove csharp and js implementations
- Add multiprocessed mining
- Add balance querying
This commit is contained in:
Pavle Portic 2020-02-04 13:41:15 +01:00
parent 1369cac209
commit 624a205a85
Signed by: TheEdgeOfRage
GPG Key ID: 6758ACE46AA2A849
33 changed files with 854 additions and 4116 deletions
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63
.gitattributes vendored
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###############################################################################
# Set default behavior to automatically normalize line endings.
###############################################################################
* text=auto
###############################################################################
# Set default behavior for command prompt diff.
#
# This is need for earlier builds of msysgit that does not have it on by
# default for csharp files.
# Note: This is only used by command line
###############################################################################
#*.cs diff=csharp
###############################################################################
# Set the merge driver for project and solution files
#
# Merging from the command prompt will add diff markers to the files if there
# are conflicts (Merging from VS is not affected by the settings below, in VS
# the diff markers are never inserted). Diff markers may cause the following
# file extensions to fail to load in VS. An alternative would be to treat
# these files as binary and thus will always conflict and require user
# intervention with every merge. To do so, just uncomment the entries below
###############################################################################
#*.sln merge=binary
#*.csproj merge=binary
#*.vbproj merge=binary
#*.vcxproj merge=binary
#*.vcproj merge=binary
#*.dbproj merge=binary
#*.fsproj merge=binary
#*.lsproj merge=binary
#*.wixproj merge=binary
#*.modelproj merge=binary
#*.sqlproj merge=binary
#*.wwaproj merge=binary
###############################################################################
# behavior for image files
#
# image files are treated as binary by default.
###############################################################################
#*.jpg binary
#*.png binary
#*.gif binary
###############################################################################
# diff behavior for common document formats
#
# Convert binary document formats to text before diffing them. This feature
# is only available from the command line. Turn it on by uncommenting the
# entries below.
###############################################################################
#*.doc diff=astextplain
#*.DOC diff=astextplain
#*.docx diff=astextplain
#*.DOCX diff=astextplain
#*.dot diff=astextplain
#*.DOT diff=astextplain
#*.pdf diff=astextplain
#*.PDF diff=astextplain
#*.rtf diff=astextplain
#*.RTF diff=astextplain

12
.travis.yml
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language: python
python:
- 3.6
- nightly
install:
- pip install pipenv
- pipenv install --dev
script:
- pipenv run python -m unittest

20
Dockerfile
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FROM python:3.6-alpine
FROM python:3.8-alpine
WORKDIR /app
EXPOSE 80
ENV FLASK_APP=run:app \
FLASK_ENV=production \
PYTHONUNBUFFERED=1
CMD ["flask", "run", "-p", "80", "-h", "0.0.0.0"]
# Install dependencies.
ADD requirements.txt /app
RUN cd /app && \
pip install -r requirements.txt
ADD requirements.txt run.py ./
RUN pip install -r requirements.txt
# Add actual source code.
ADD blockchain.py /app
EXPOSE 5000
CMD ["python", "blockchain.py", "--port", "5000"]
ADD blockchain/ ./blockchain/

15
Pipfile
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[[source]]
url = "https://pypi.python.org/simple"
verify_ssl = true
name = "pypi"
[dev-packages]
[requires]
python_version = "3.6"
[packages]
flask = "==0.12.2"
requests = "==2.18.4"

109
Pipfile.lock generated
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@ -1,109 +0,0 @@
{
"_meta": {
"hash": {
"sha256": "45af71184b5b013f58a8601f7f87c9f0b882afe19f197ce45d6d08e46d615159"
},
"host-environment-markers": {
"implementation_name": "cpython",
"implementation_version": "3.6.2",
"os_name": "posix",
"platform_machine": "x86_64",
"platform_python_implementation": "CPython",
"platform_release": "4.10.0-35-generic",
"platform_system": "Linux",
"platform_version": "#39~16.04.1-Ubuntu SMP Wed Sep 13 09:02:42 UTC 2017",
"python_full_version": "3.6.2",
"python_version": "3.6",
"sys_platform": "linux"
},
"pipfile-spec": 6,
"requires": {
"python_version": "3.6"
},
"sources": [
{
"name": "pypi",
"url": "https://pypi.python.org/simple",
"verify_ssl": true
}
]
},
"default": {
"certifi": {
"hashes": [
"sha256:54a07c09c586b0e4c619f02a5e94e36619da8e2b053e20f594348c0611803704",
"sha256:40523d2efb60523e113b44602298f0960e900388cf3bb6043f645cf57ea9e3f5"
],
"version": "==2017.7.27.1"
},
"chardet": {
"hashes": [
"sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691",
"sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
],
"version": "==3.0.4"
},
"click": {
"hashes": [
"sha256:29f99fc6125fbc931b758dc053b3114e55c77a6e4c6c3a2674a2dc986016381d",
"sha256:f15516df478d5a56180fbf80e68f206010e6d160fc39fa508b65e035fd75130b"
],
"version": "==6.7"
},
"flask": {
"hashes": [
"sha256:0749df235e3ff61ac108f69ac178c9770caeaccad2509cb762ce1f65570a8856",
"sha256:49f44461237b69ecd901cc7ce66feea0319b9158743dd27a2899962ab214dac1"
],
"version": "==0.12.2"
},
"idna": {
"hashes": [
"sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4",
"sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f"
],
"version": "==2.6"
},
"itsdangerous": {
"hashes": [
"sha256:cbb3fcf8d3e33df861709ecaf89d9e6629cff0a217bc2848f1b41cd30d360519"
],
"version": "==0.24"
},
"jinja2": {
"hashes": [
"sha256:2231bace0dfd8d2bf1e5d7e41239c06c9e0ded46e70cc1094a0aa64b0afeb054",
"sha256:ddaa01a212cd6d641401cb01b605f4a4d9f37bfc93043d7f760ec70fb99ff9ff"
],
"version": "==2.9.6"
},
"markupsafe": {
"hashes": [
"sha256:a6be69091dac236ea9c6bc7d012beab42010fa914c459791d627dad4910eb665"
],
"version": "==1.0"
},
"requests": {
"hashes": [
"sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b",
"sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e"
],
"version": "==2.18.4"
},
"urllib3": {
"hashes": [
"sha256:06330f386d6e4b195fbfc736b297f58c5a892e4440e54d294d7004e3a9bbea1b",
"sha256:cc44da8e1145637334317feebd728bd869a35285b93cbb4cca2577da7e62db4f"
],
"version": "==1.22"
},
"werkzeug": {
"hashes": [
"sha256:e8549c143af3ce6559699a01e26fa4174f4c591dbee0a499f3cd4c3781cdec3d",
"sha256:903a7b87b74635244548b30d30db4c8947fe64c5198f58899ddcd3a13c23bb26"
],
"version": "==0.12.2"
}
},
"develop": {}
}

301
blockchain.py
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import hashlib
import json
from time import time
from urllib.parse import urlparse
from uuid import uuid4
import requests
from flask import Flask, jsonify, request
class Blockchain:
def __init__(self):
self.current_transactions = []
self.chain = []
self.nodes = set()
# Create the genesis block
self.new_block(previous_hash='1', proof=100)
def register_node(self, address):
"""
Add a new node to the list of nodes
:param address: Address of node. Eg. 'http://192.168.0.5:5000'
"""
parsed_url = urlparse(address)
if parsed_url.netloc:
self.nodes.add(parsed_url.netloc)
elif parsed_url.path:
# Accepts an URL without scheme like '192.168.0.5:5000'.
self.nodes.add(parsed_url.path)
else:
raise ValueError('Invalid URL')
def valid_chain(self, chain):
"""
Determine if a given blockchain is valid
:param chain: A blockchain
:return: True if valid, False if not
"""
last_block = chain[0]
current_index = 1
while current_index < len(chain):
block = chain[current_index]
print(f'{last_block}')
print(f'{block}')
print("\n-----------\n")
# Check that the hash of the block is correct
last_block_hash = self.hash(last_block)
if block['previous_hash'] != last_block_hash:
return False
# Check that the Proof of Work is correct
if not self.valid_proof(last_block['proof'], block['proof'], last_block_hash):
return False
last_block = block
current_index += 1
return True
def resolve_conflicts(self):
"""
This is our consensus algorithm, it resolves conflicts
by replacing our chain with the longest one in the network.
:return: True if our chain was replaced, False if not
"""
neighbours = self.nodes
new_chain = None
# We're only looking for chains longer than ours
max_length = len(self.chain)
# Grab and verify the chains from all the nodes in our network
for node in neighbours:
response = requests.get(f'http://{node}/chain')
if response.status_code == 200:
length = response.json()['length']
chain = response.json()['chain']
# Check if the length is longer and the chain is valid
if length > max_length and self.valid_chain(chain):
max_length = length
new_chain = chain
# Replace our chain if we discovered a new, valid chain longer than ours
if new_chain:
self.chain = new_chain
return True
return False
def new_block(self, proof, previous_hash):
"""
Create a new Block in the Blockchain
:param proof: The proof given by the Proof of Work algorithm
:param previous_hash: Hash of previous Block
:return: New Block
"""
block = {
'index': len(self.chain) + 1,
'timestamp': time(),
'transactions': self.current_transactions,
'proof': proof,
'previous_hash': previous_hash or self.hash(self.chain[-1]),
}
# Reset the current list of transactions
self.current_transactions = []
self.chain.append(block)
return block
def new_transaction(self, sender, recipient, amount):
"""
Creates a new transaction to go into the next mined Block
:param sender: Address of the Sender
:param recipient: Address of the Recipient
:param amount: Amount
:return: The index of the Block that will hold this transaction
"""
self.current_transactions.append({
'sender': sender,
'recipient': recipient,
'amount': amount,
})
return self.last_block['index'] + 1
@property
def last_block(self):
return self.chain[-1]
@staticmethod
def hash(block):
"""
Creates a SHA-256 hash of a Block
:param block: Block
"""
# We must make sure that the Dictionary is Ordered, or we'll have inconsistent hashes
block_string = json.dumps(block, sort_keys=True).encode()
return hashlib.sha256(block_string).hexdigest()
def proof_of_work(self, last_block):
"""
Simple Proof of Work Algorithm:
- Find a number p' such that hash(pp') contains leading 4 zeroes
- Where p is the previous proof, and p' is the new proof
:param last_block: <dict> last Block
:return: <int>
"""
last_proof = last_block['proof']
last_hash = self.hash(last_block)
proof = 0
while self.valid_proof(last_proof, proof, last_hash) is False:
proof += 1
return proof
@staticmethod
def valid_proof(last_proof, proof, last_hash):
"""
Validates the Proof
:param last_proof: <int> Previous Proof
:param proof: <int> Current Proof
:param last_hash: <str> The hash of the Previous Block
:return: <bool> True if correct, False if not.
"""
guess = f'{last_proof}{proof}{last_hash}'.encode()
guess_hash = hashlib.sha256(guess).hexdigest()
return guess_hash[:4] == "0000"
# Instantiate the 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():
# We run the proof of work algorithm to get the next proof...
last_block = blockchain.last_block
proof = blockchain.proof_of_work(last_block)
# We must receive a reward for finding the proof.
# The sender is "0" to signify that this node has mined a new coin.
blockchain.new_transaction(
sender="0",
recipient=node_identifier,
amount=1,
)
# Forge the new Block by adding it to the chain
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
response = {
'message': "New Block Forged",
'index': block['index'],
'transactions': block['transactions'],
'proof': block['proof'],
'previous_hash': block['previous_hash'],
}
return jsonify(response), 200
@app.route('/transactions/new', methods=['POST'])
def new_transaction():
values = request.get_json()
# Check that the required fields are in the POST'ed data
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'])
response = {'message': f'Transaction will be added to Block {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
@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
@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__':
from argparse import ArgumentParser
parser = ArgumentParser()
parser.add_argument('-p', '--port', default=5000, type=int, help='port to listen on')
args = parser.parse_args()
port = args.port
app.run(host='0.0.0.0', port=port)

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blockchain/__init__.py Normal file
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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
from flask import Flask
def init_blueprints(app):
from .app import app as app_bp
app.register_blueprint(app_bp, url_prefix='/')
def create_app(package_name=__name__):
app = Flask(package_name)
init_blueprints(app)
return app

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blockchain/app.py Normal file
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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
from decimal import Decimal
from uuid import uuid4
from flask import Blueprint, request
from .blockchain import Blockchain
from .utils import jsonify
app = Blueprint('app', __name__)
identifier = str(uuid4()).replace('-', '')
blockchain = Blockchain()
@app.route('/mine', methods=['POST'])
def mine():
# We run the proof of work algorithm to get the next proof...
last_block = blockchain.last_block
proof = blockchain.proof_of_work(last_block)
# We must receive a reward for finding the proof.
# The sender is '0' to signify that this node has mined a new coin.
blockchain.new_transaction(
sender='0',
recipient=identifier,
amount=Decimal(1),
)
previous_hash = blockchain.hash(last_block)
block = blockchain.new_block(proof, previous_hash)
return jsonify({
'msg': 'New Block Forged',
'index': block['index'],
'transactions': block['transactions'],
'proof': block['proof'],
'previous_hash': block['previous_hash'],
}), 200
@app.route('/transactions', methods=['POST'])
def create_transaction():
sender = request.json.get('sender')
recipient = request.json.get('recipient')
amount = request.json.get('amount')
if None in (sender, recipient, amount):
return {'msg': 'Missing parameter'}, 400
index = blockchain.new_transaction(
sender,
recipient,
Decimal(amount),
)
return jsonify({
'msg': f'Transaction will be added to Block {index}'
}), 201
@app.route('/chain', methods=['GET'])
def full_chain():
return jsonify({
'chain': blockchain.chain,
'length': len(blockchain.chain),
}), 200
@app.route('/identifier', methods=['GET'])
def get_identifier():
return jsonify({
'identifier': identifier
})
@app.route('/nodes', methods=['GET'])
def get_nodes():
return jsonify({
'nodes': list(blockchain.nodes),
}), 200
@app.route('/nodes/<identifier>/balance', methods=['GET'])
def get_balance(identifier):
balance = blockchain.get_balance(identifier)
if balance is None:
return jsonify({
'msg': 'Chain is not valid',
}), 500
return jsonify({
'identifier': identifier,
'balance': balance,
}), 200
@app.route('/nodes/register', methods=['POST'])
def register_nodes():
nodes = request.json.get('nodes')
if None in (nodes,):
return {'msg': 'No valid list of nodes'}, 400
for node in nodes:
blockchain.register_node(node)
return jsonify({
'msg': 'New nodes have been added',
'total_nodes': list(blockchain.nodes),
}), 201
@app.route('/nodes/resolve', methods=['POST'])
def consensus():
replaced = blockchain.resolve_conflicts()
if replaced:
message = 'Our chain was replaced'
else:
message = 'Our chain is authoritative'
return jsonify({
'msg': message,
'chain': blockchain.chain,
}), 200

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blockchain/blockchain.py Normal file
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import hashlib
from decimal import Decimal
from time import time
from urllib.parse import urlparse
import requests
from .utils import dumps, do_process_pow, valid_proof
DIFFICULTY = 24
class Blockchain:
def __init__(self):
self.current_transactions = []
self.chain = []
self.nodes = set()
# Create the genesis block
self.new_block(previous_hash='1', proof=100)
def register_node(self, address):
"""
Add a new node to the list of nodes
:param address: Address of the node
"""
parsed_url = urlparse(address)
if parsed_url.netloc:
self.nodes.add(parsed_url.netloc)
elif parsed_url.path:
# Accepts an URL without scheme like '192.168.0.5:5000'.
self.nodes.add(parsed_url.path)
else:
raise ValueError('Invalid URL')
def valid_chain(self, chain):
"""
Determine if a given blockchain is valid
:param chain: A blockchain
:return: True if valid, False if not
"""
last_block = chain[0]
current_index = 1
while current_index < len(chain):
block = chain[current_index]
# print(f'{last_block}')
# print(f'{block}')
# print("\n-----------\n")
# Check that the hash of the block is correct
last_block_hash = self.hash(last_block)
if block['previous_hash'] != last_block_hash:
return False
# Check that the Proof of Work is correct
if not valid_proof(last_block['proof'], block['proof'], last_block_hash):
return False
last_block = block
current_index += 1
return True
def resolve_conflicts(self):
"""
This is our consensus algorithm, it resolves conflicts
by replacing our chain with the longest one in the network.
:return: True if our chain was replaced, False if not
"""
neighbours = self.nodes
new_chain = None
# We're only looking for chains longer than ours
max_length = len(self.chain)
# Grab and verify the chains from all the nodes in our network
for node in neighbours:
response = requests.get(f'http://{node}/chain')
if response.status_code == 200:
length = response.json()['length']
chain = response.json()['chain']
# Check if the length is longer and the chain is valid
if length > max_length and self.valid_chain(chain):
max_length = length
new_chain = chain
# Replace our chain if we discovered a new, valid chain longer than ours
if new_chain:
self.chain = new_chain
return True
return False
def new_block(self, proof, previous_hash):
"""
Create a new Block in the Blockchain
:param proof: The proof given by the Proof of Work algorithm
:param previous_hash: Hash of previous Block
:return: New Block
"""
block = {
'index': len(self.chain) + 1,
'timestamp': time(),
'transactions': self.current_transactions,
'proof': proof,
'previous_hash': previous_hash or self.hash(self.chain[-1]),
}
self.current_transactions = []
self.chain.append(block)
return block
def new_transaction(self, sender, recipient, amount):
"""
Creates a new transaction to go into the next mined Block
:param sender: Address of the Sender
:param recipient: Address of the Recipient
:param amount: Amount
:return: The index of the Block that will hold this transaction
"""
self.current_transactions.append({
'sender': sender,
'recipient': recipient,
'amount': amount,
})
return self.last_block['index'] + 1
@property
def last_block(self):
return self.chain[-1]
@staticmethod
def hash(block):
"""
Creates a SHA-256 hash of a Block
:param block: Block
"""
block_string = dumps(block, separators=(",", ":"), sort_keys=True).encode()
return hashlib.sha256(block_string).hexdigest()
def proof_of_work(self, last_block):
"""
Simple Proof of Work Algorithm:
- Find a number p' such that hash(pp') contains leading DIFFICULTY zeroes
- Where p is the previous proof, and p' is the new proof
:param last_block: <dict> last Block
:return: <int>
"""
last_proof = last_block['proof']
last_hash = self.hash(last_block)
return do_process_pow(last_proof, last_hash, DIFFICULTY)
def get_balance(self, identifier):
"""
Returns the balance of a node, by iterating through all transactions
:param identifier: <str> node identifier
:return: <int> balance of the node
"""
if not self.valid_chain(self.chain):
return None
balance = Decimal(0)
for block in self.chain:
for transaction in block['transactions']:
if transaction['sender'] == identifier:
balance -= transaction['amount']
if transaction['recipient'] == identifier:
balance += transaction['amount']
return balance

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blockchain/utils.py Normal file
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#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
#
# Copyright © 2020 <pavle.portic@tilda.center>
#
# Distributed under terms of the BSD 3-Clause license.
import hashlib
import itertools
from multiprocessing import (
cpu_count,
Pool,
Process,
Queue
)
from flask import current_app, json
def dumps(*args, **kwargs):
if len(args) == 1:
data = args[0]
else:
data = args
return json.dumps(
data,
use_decimal=True,
**kwargs,
)
def jsonify(*args, **kwargs):
indent = None
separators = (",", ":")
if current_app.config["JSONIFY_PRETTYPRINT_REGULAR"] or current_app.debug:
indent = 2
separators = (", ", ": ")
return current_app.response_class(
dumps(
*args,
indent=indent,
separators=separators,
) + "\n",
mimetype=current_app.config["JSONIFY_MIMETYPE"],
)
def do_pooled_pow(last_proof, last_hash, difficulty):
queue = Queue()
with Pool() as p:
result = p.starmap_async(pool_worker, ((
queue,
i,
last_proof,
last_hash,
difficulty,
) for i in itertools.count()), chunksize=100)
proof = queue.get()
result.wait()
p.terminate()
return proof
def pool_worker(queue, proof, last_proof, last_hash, difficulty):
if valid_proof(last_proof, proof, last_hash):
queue.put(proof)
return proof
return None
def do_process_pow(last_proof, last_hash, difficulty):
queue = Queue()
processes = [
Process(
target=process_worker,
args=(
queue,
last_proof,
last_hash,
difficulty,
step,
)
) for step in range(cpu_count())
]
for p in processes:
p.start()
proof = queue.get()
for p in processes:
p.terminate()
return proof
def process_worker(queue, last_proof, last_hash, difficulty, step):
proof = step
while not valid_proof(last_proof, proof, last_hash, difficulty):
proof += step
queue.put(proof)
return
def valid_proof(last_proof, proof, last_hash, difficulty):
"""
Validates the Proof
:param last_proof: <int> Previous Proof
:param proof: <int> Current Proof
:param last_hash: <str> The hash of the Previous Block
:return: <bool> True if correct, False if not.
"""
guess = f'{last_proof}{proof}{last_hash}'.encode()
guess_hash = hashlib.sha256(guess)
binary_hash = ''.join(format(n, '08b') for n in guess_hash.digest())
return binary_hash[:difficulty] == '0' * difficulty

10
csharp/BlockChain.Console/App.config
View File

@ -1,10 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<configuration>
<startup>
<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1"/>
</startup>
<appSettings>
<add key="host" value="localhost" />
<add key="port" value="12345" />
</appSettings>
</configuration>

63
csharp/BlockChain.Console/BlockChain.Console.csproj
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@ -1,63 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{D0C795A0-6F20-4A8E-BE44-801678754DA4}</ProjectGuid>
<OutputType>Exe</OutputType>
<RootNamespace>BlockChainDemo.Console</RootNamespace>
<AssemblyName>BlockChainDemo.Console</AssemblyName>
<TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
<SccProjectName>SAK</SccProjectName>
<SccLocalPath>SAK</SccLocalPath>
<SccAuxPath>SAK</SccAuxPath>
<SccProvider>SAK</SccProvider>
<TargetFrameworkProfile />
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<PlatformTarget>AnyCPU</PlatformTarget>
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="System" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
</ItemGroup>
<ItemGroup>
<Compile Include="Program.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
</ItemGroup>
<ItemGroup>
<None Include="App.config" />
</ItemGroup>
<ItemGroup>
<ProjectReference Include="..\BlockChain\BlockChain.csproj">
<Project>{e06fc4ce-77d0-4a64-94a6-32a08920e481}</Project>
<Name>BlockChain</Name>
</ProjectReference>
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
</Project>

12
csharp/BlockChain.Console/Program.cs
View File

@ -1,12 +0,0 @@
namespace BlockChainDemo.Console
{
class Program
{
static void Main(string[] args)
{
var chain = new BlockChain();
var server = new WebServer(chain);
System.Console.Read();
}
}
}

36
csharp/BlockChain.Console/Properties/AssemblyInfo.cs
View File

@ -1,36 +0,0 @@
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("BlockChain.Console")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("BlockChain.Console")]
[assembly: AssemblyCopyright("Copyright © 2017")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("d0c795a0-6f20-4a8e-be44-801678754da4")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

43
csharp/BlockChain.sln
View File

@ -1,43 +0,0 @@

Microsoft Visual Studio Solution File, Format Version 12.00
# Visual Studio 15
VisualStudioVersion = 15.0.27004.2008
MinimumVisualStudioVersion = 10.0.40219.1
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlockChain", "BlockChain\BlockChain.csproj", "{E06FC4CE-77D0-4A64-94A6-32A08920E481}"
EndProject
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BlockChain.Console", "BlockChain.Console\BlockChain.Console.csproj", "{D0C795A0-6F20-4A8E-BE44-801678754DA4}"
EndProject
Global
GlobalSection(SolutionConfigurationPlatforms) = preSolution
Debug|Any CPU = Debug|Any CPU
Release|Any CPU = Release|Any CPU
EndGlobalSection
GlobalSection(ProjectConfigurationPlatforms) = postSolution
{E06FC4CE-77D0-4A64-94A6-32A08920E481}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{E06FC4CE-77D0-4A64-94A6-32A08920E481}.Debug|Any CPU.Build.0 = Debug|Any CPU
{E06FC4CE-77D0-4A64-94A6-32A08920E481}.Release|Any CPU.ActiveCfg = Release|Any CPU
{E06FC4CE-77D0-4A64-94A6-32A08920E481}.Release|Any CPU.Build.0 = Release|Any CPU
{D0C795A0-6F20-4A8E-BE44-801678754DA4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
{D0C795A0-6F20-4A8E-BE44-801678754DA4}.Debug|Any CPU.Build.0 = Debug|Any CPU
{D0C795A0-6F20-4A8E-BE44-801678754DA4}.Release|Any CPU.ActiveCfg = Release|Any CPU
{D0C795A0-6F20-4A8E-BE44-801678754DA4}.Release|Any CPU.Build.0 = Release|Any CPU
EndGlobalSection
GlobalSection(SolutionProperties) = preSolution
HideSolutionNode = FALSE
EndGlobalSection
GlobalSection(ExtensibilityGlobals) = postSolution
SolutionGuid = {7FB3650B-CAFB-4A71-940B-0CA6F0377422}
EndGlobalSection
GlobalSection(TeamFoundationVersionControl) = preSolution
SccNumberOfProjects = 3
SccEnterpriseProvider = {4CA58AB2-18FA-4F8D-95D4-32DDF27D184C}
SccTeamFoundationServer = https://devfire.visualstudio.com/
SccLocalPath0 = .
SccProjectUniqueName1 = BlockChain\\BlockChain.csproj
SccProjectName1 = BlockChain
SccLocalPath1 = BlockChain
SccProjectUniqueName2 = BlockChain.Console\\BlockChain.Console.csproj
SccProjectName2 = BlockChain.Console
SccLocalPath2 = BlockChain.Console
EndGlobalSection
EndGlobal

19
csharp/BlockChain/Block.cs
View File

@ -1,19 +0,0 @@
using System;
using System.Collections.Generic;
namespace BlockChainDemo
{
public class Block
{
public int Index { get; set; }
public DateTime Timestamp { get; set; }
public List<Transaction> Transactions { get; set; }
public int Proof { get; set; }
public string PreviousHash { get; set; }
public override string ToString()
{
return $"{Index} [{Timestamp.ToString("yyyy-MM-dd HH:mm:ss")}] Proof: {Proof} | PrevHash: {PreviousHash} | Trx: {Transactions.Count}";
}
}
}

226
csharp/BlockChain/BlockChain.cs
View File

@ -1,226 +0,0 @@
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.Linq;
using System.Net;
using System.Security.Cryptography;
using System.Text;
namespace BlockChainDemo
{
public class BlockChain
{
private List<Transaction> _currentTransactions = new List<Transaction>();
private List<Block> _chain = new List<Block>();
private List<Node> _nodes = new List<Node>();
private Block _lastBlock => _chain.Last();
public string NodeId { get; private set; }
//ctor
public BlockChain()
{
NodeId = Guid.NewGuid().ToString().Replace("-", "");
CreateNewBlock(proof: 100, previousHash: "1"); //genesis block
}
//private functionality
private void RegisterNode(string address)
{
_nodes.Add(new Node { Address = new Uri(address) });
}
private bool IsValidChain(List<Block> chain)
{
Block block = null;
Block lastBlock = chain.First();
int currentIndex = 1;
while (currentIndex < chain.Count)
{
block = chain.ElementAt(currentIndex);
Debug.WriteLine($"{lastBlock}");
Debug.WriteLine($"{block}");
Debug.WriteLine("----------------------------");
//Check that the hash of the block is correct
if (block.PreviousHash != GetHash(lastBlock))
return false;
//Check that the Proof of Work is correct
if (!IsValidProof(lastBlock.Proof, block.Proof, lastBlock.PreviousHash))
return false;
lastBlock = block;
currentIndex++;
}
return true;
}
private bool ResolveConflicts()
{
List<Block> newChain = null;
int maxLength = _chain.Count;
foreach (Node node in _nodes)
{
var url = new Uri(node.Address, "/chain");
var request = (HttpWebRequest)WebRequest.Create(url);
var response = (HttpWebResponse)request.GetResponse();
if (response.StatusCode == HttpStatusCode.OK)
{
var model = new
{
chain = new List<Block>(),
length = 0
};
string json = new StreamReader(response.GetResponseStream()).ReadToEnd();
var data = JsonConvert.DeserializeAnonymousType(json, model);
if (data.chain.Count > _chain.Count && IsValidChain(data.chain))
{
maxLength = data.chain.Count;
newChain = data.chain;
}
}
}
if (newChain != null)
{
_chain = newChain;
return true;
}
return false;
}
private Block CreateNewBlock(int proof, string previousHash = null)
{
var block = new Block
{
Index = _chain.Count,
Timestamp = DateTime.UtcNow,
Transactions = _currentTransactions.ToList(),
Proof = proof,
PreviousHash = previousHash ?? GetHash(_chain.Last())
};
_currentTransactions.Clear();
_chain.Add(block);
return block;
}
private int CreateProofOfWork(int lastProof, string previousHash)
{
int proof = 0;
while (!IsValidProof(lastProof, proof, previousHash))
proof++;
return proof;
}
private bool IsValidProof(int lastProof, int proof, string previousHash)
{
string guess = $"{lastProof}{proof}{previousHash}";
string result = GetSha256(guess);
return result.StartsWith("0000");
}
private string GetHash(Block block)
{
string blockText = JsonConvert.SerializeObject(block);
return GetSha256(blockText);
}
private string GetSha256(string data)
{
var sha256 = new SHA256Managed();
var hashBuilder = new StringBuilder();
byte[] bytes = Encoding.Unicode.GetBytes(data);
byte[] hash = sha256.ComputeHash(bytes);
foreach (byte x in hash)
hashBuilder.Append($"{x:x2}");
return hashBuilder.ToString();
}
//web server calls
internal string Mine()
{
int proof = CreateProofOfWork(_lastBlock.Proof, _lastBlock.PreviousHash);
CreateTransaction(sender: "0", recipient: NodeId, amount: 1);
Block block = CreateNewBlock(proof /*, _lastBlock.PreviousHash*/);
var response = new
{
Message = "New Block Forged",
Index = block.Index,
Transactions = block.Transactions.ToArray(),
Proof = block.Proof,
PreviousHash = block.PreviousHash
};
return JsonConvert.SerializeObject(response);
}
internal string GetFullChain()
{
var response = new
{
chain = _chain.ToArray(),
length = _chain.Count
};
return JsonConvert.SerializeObject(response);
}
internal string RegisterNodes(string[] nodes)
{
var builder = new StringBuilder();
foreach (string node in nodes)
{
string url = $"http://{node}";
RegisterNode(url);
builder.Append($"{url}, ");
}
builder.Insert(0, $"{nodes.Count()} new nodes have been added: ");
string result = builder.ToString();
return result.Substring(0, result.Length - 2);
}
internal string Consensus()
{
bool replaced = ResolveConflicts();
string message = replaced ? "was replaced" : "is authoritive";
var response = new
{
Message = $"Our chain {message}",
Chain = _chain
};
return JsonConvert.SerializeObject(response);
}
internal int CreateTransaction(string sender, string recipient, int amount)
{
var transaction = new Transaction
{
Sender = sender,
Recipient = recipient,
Amount = amount
};
_currentTransactions.Add(transaction);
return _lastBlock != null ? _lastBlock.Index + 1 : 0;
}
}
}

73
csharp/BlockChain/BlockChain.csproj
View File

@ -1,73 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
<PropertyGroup>
<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
<Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
<ProjectGuid>{E06FC4CE-77D0-4A64-94A6-32A08920E481}</ProjectGuid>
<OutputType>Library</OutputType>
<AppDesignerFolder>Properties</AppDesignerFolder>
<RootNamespace>BlockChainDemo</RootNamespace>
<AssemblyName>BlockChainDemo</AssemblyName>
<TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
<FileAlignment>512</FileAlignment>
<SccProjectName>SAK</SccProjectName>
<SccLocalPath>SAK</SccLocalPath>
<SccAuxPath>SAK</SccAuxPath>
<SccProvider>SAK</SccProvider>
<TargetFrameworkProfile />
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
<DebugSymbols>true</DebugSymbols>
<DebugType>full</DebugType>
<Optimize>false</Optimize>
<OutputPath>bin\Debug\</OutputPath>
<DefineConstants>DEBUG;TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
<DebugType>pdbonly</DebugType>
<Optimize>true</Optimize>
<OutputPath>bin\Release\</OutputPath>
<DefineConstants>TRACE</DefineConstants>
<ErrorReport>prompt</ErrorReport>
<WarningLevel>4</WarningLevel>
</PropertyGroup>
<ItemGroup>
<Reference Include="Newtonsoft.Json, Version=10.0.0.0, Culture=neutral, PublicKeyToken=30ad4fe6b2a6aeed, processorArchitecture=MSIL">
<HintPath>..\packages\Newtonsoft.Json.10.0.3\lib\net45\Newtonsoft.Json.dll</HintPath>
</Reference>
<Reference Include="System" />
<Reference Include="System.configuration" />
<Reference Include="System.Core" />
<Reference Include="System.Xml.Linq" />
<Reference Include="System.Data.DataSetExtensions" />
<Reference Include="Microsoft.CSharp" />
<Reference Include="System.Data" />
<Reference Include="System.Net.Http" />
<Reference Include="System.Xml" />
<Reference Include="TinyWebServer, Version=1.0.0.0, Culture=neutral, processorArchitecture=MSIL">
<HintPath>..\packages\TinyWebServer.dll.1.0.1\lib\net40\TinyWebServer.dll</HintPath>
</Reference>
</ItemGroup>
<ItemGroup>
<Compile Include="Block.cs" />
<Compile Include="BlockChain.cs" />
<Compile Include="Node.cs" />
<Compile Include="Properties\AssemblyInfo.cs" />
<Compile Include="Transaction.cs" />
<Compile Include="WebServer.cs" />
</ItemGroup>
<ItemGroup>
<None Include="packages.config" />
</ItemGroup>
<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
Other similar extension points exist, see Microsoft.Common.targets.
<Target Name="BeforeBuild">
</Target>
<Target Name="AfterBuild">
</Target>
-->
</Project>

9
csharp/BlockChain/Node.cs
View File

@ -1,9 +0,0 @@
using System;
namespace BlockChainDemo
{
public class Node
{
public Uri Address { get; set; }
}
}

36
csharp/BlockChain/Properties/AssemblyInfo.cs
View File

@ -1,36 +0,0 @@
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
// General Information about an assembly is controlled through the following
// set of attributes. Change these attribute values to modify the information
// associated with an assembly.
[assembly: AssemblyTitle("BlockChain")]
[assembly: AssemblyDescription("")]
[assembly: AssemblyConfiguration("")]
[assembly: AssemblyCompany("")]
[assembly: AssemblyProduct("BlockChain")]
[assembly: AssemblyCopyright("Copyright © 2017")]
[assembly: AssemblyTrademark("")]
[assembly: AssemblyCulture("")]
// Setting ComVisible to false makes the types in this assembly not visible
// to COM components. If you need to access a type in this assembly from
// COM, set the ComVisible attribute to true on that type.
[assembly: ComVisible(false)]
// The following GUID is for the ID of the typelib if this project is exposed to COM
[assembly: Guid("e06fc4ce-77d0-4a64-94a6-32a08920e481")]
// Version information for an assembly consists of the following four values:
//
// Major Version
// Minor Version
// Build Number
// Revision
//
// You can specify all the values or you can default the Build and Revision Numbers
// by using the '*' as shown below:
// [assembly: AssemblyVersion("1.0.*")]
[assembly: AssemblyVersion("1.0.0.0")]
[assembly: AssemblyFileVersion("1.0.0.0")]

9
csharp/BlockChain/Transaction.cs
View File

@ -1,9 +0,0 @@
namespace BlockChainDemo
{
public class Transaction
{
public int Amount { get; set; }
public string Recipient { get; set; }
public string Sender { get; set; }
}
}

78
csharp/BlockChain/WebServer.cs
View File

@ -1,78 +0,0 @@
using Newtonsoft.Json;
using System.Configuration;
using System.IO;
using System.Net;
using System.Net.Http;
namespace BlockChainDemo
{
public class WebServer
{
public WebServer(BlockChain chain)
{
var settings = ConfigurationManager.AppSettings;
string host = settings["host"]?.Length > 1 ? settings["host"] : "localhost";
string port = settings["port"]?.Length > 1 ? settings["port"] : "12345";
var server = new TinyWebServer.WebServer(request =>
{
string path = request.Url.PathAndQuery.ToLower();
string query = "";
string json = "";
if (path.Contains("?"))
{
string[] parts = path.Split('?');
path = parts[0];
query = parts[1];
}
switch (path)
{
//GET: http://localhost:12345/mine
case "/mine":
return chain.Mine();
//POST: http://localhost:12345/transactions/new
//{ "Amount":123, "Recipient":"ebeabf5cc1d54abdbca5a8fe9493b479", "Sender":"31de2e0ef1cb4937830fcfd5d2b3b24f" }
case "/transactions/new":
if (request.HttpMethod != HttpMethod.Post.Method)
return $"{new HttpResponseMessage(HttpStatusCode.MethodNotAllowed)}";
json = new StreamReader(request.InputStream).ReadToEnd();
Transaction trx = JsonConvert.DeserializeObject<Transaction>(json);
int blockId = chain.CreateTransaction(trx.Sender, trx.Recipient, trx.Amount);
return $"Your transaction will be included in block {blockId}";
//GET: http://localhost:12345/chain
case "/chain":
return chain.GetFullChain();
//POST: http://localhost:12345/nodes/register
//{ "Urls": ["localhost:54321", "localhost:54345", "localhost:12321"] }
case "/nodes/register":
if (request.HttpMethod != HttpMethod.Post.Method)
return $"{new HttpResponseMessage(HttpStatusCode.MethodNotAllowed)}";
json = new StreamReader(request.InputStream).ReadToEnd();
var urlList = new { Urls = new string[0] };
var obj = JsonConvert.DeserializeAnonymousType(json, urlList);
return chain.RegisterNodes(obj.Urls);
//GET: http://localhost:12345/nodes/resolve
case "/nodes/resolve":
return chain.Consensus();
}
return "";
},
$"http://{host}:{port}/mine/",
$"http://{host}:{port}/transactions/new/",
$"http://{host}:{port}/chain/",
$"http://{host}:{port}/nodes/register/",
$"http://{host}:{port}/nodes/resolve/"
);
server.Run();
}
}
}

5
csharp/BlockChain/packages.config
View File

@ -1,5 +0,0 @@
<?xml version="1.0" encoding="utf-8"?>
<packages>
<package id="Newtonsoft.Json" version="10.0.3" targetFramework="net451" />
<package id="TinyWebServer.dll" version="1.0.1" targetFramework="net451" />
</packages>

13
docker-compose.yml Normal file
View File

@ -0,0 +1,13 @@
version: '3'
services:
node1:
image: blockchain
build: .
ports:
- 5001:80
node2:
image: blockchain
build: .
ports:
- 5002:80

34
init Executable file
View File

@ -0,0 +1,34 @@
#!/bin/bash
function register_nodes() {
http POST localhost:5001/nodes/register \
nodes:='["http://localhost:5002"]'
http POST localhost:5002/nodes/register \
nodes:='["http://localhost:5001"]'
}
function synchronise_nodes() {
http POST localhost:5001/nodes/resolve
http POST localhost:5002/nodes/resolve
}
NODE1_ID=$(http localhost:5001/identifier | jq -r ".identifier")
NODE2_ID=$(http localhost:5002/identifier | jq -r ".identifier")
register_nodes >/dev/null
# Mine a few initial blocks
http POST localhost:5001/mine
http POST localhost:5001/mine
synchronise_nodes >/dev/null
http POST localhost:5001/transactions sender=$NODE1_ID recipient=$NODE2_ID amount=1.3
http POST localhost:5001/mine
synchronise_nodes >/dev/null
http localhost:5001/nodes/$NODE1_ID/balance
http localhost:5001/nodes/$NODE2_ID/balance
echo node1: $NODE1_ID
echo node2: $NODE2_ID

102
js/blockchain.js
View File

@ -1,102 +0,0 @@
const crypto = require("crypto");
class Blockchain {
constructor() {
this.chain = [];
this.pendingTransactions = [];
this.newBlock();
this.peers = new Set();
}
/**
* Adds a node to our peer table
*/
addPeer(host) {
this.peers.add(host);
}
/**
* Adds a node to our peer table
*/
getPeers() {
return Array.from(this.peers);
}
/**
* Creates a new block containing any outstanding transactions
*/
newBlock(previousHash, nonce = null) {
let block = {
index: this.chain.length,
timestamp: new Date().toISOString(),
transactions: this.pendingTransactions,
previousHash,
nonce
};
block.hash = Blockchain.hash(block);
console.log(`Created block ${block.index}`);
// Add the new block to the blockchain
this.chain.push(block);
// Reset pending transactions
this.pendingTransactions = [];
}
/**
* Generates a SHA-256 hash of the block
*/
static hash(block) {
const blockString = JSON.stringify(block, Object.keys(block).sort());
return crypto.createHash("sha256").update(blockString).digest("hex");
}
/**
* Returns the last block in the chain
*/
lastBlock() {
return this.chain.length && this.chain[this.chain.length - 1];
}
/**
* Determines if a hash begins with a "difficulty" number of 0s
*
* @param hashOfBlock: the hash of the block (hex string)
* @param difficulty: an integer defining the difficulty
*/
static powIsAcceptable(hashOfBlock, difficulty) {
return hashOfBlock.slice(0, difficulty) === "0".repeat(difficulty);
}
/**
* Generates a random 32 byte string
*/
static nonce() {
return crypto.createHash("sha256").update(crypto.randomBytes(32)).digest("hex");
}
/**
* Proof of Work mining algorithm
*
* We hash the block with random string until the hash begins with
* a "difficulty" number of 0s.
*/
mine(blockToMine = null, difficulty = 4) {
const block = blockToMine || this.lastBlock();
while (true) {
block.nonce = Blockchain.nonce();
if (Blockchain.powIsAcceptable(Blockchain.hash(block), difficulty)) {
console.log("We mined a block!")
console.log(` - Block hash: ${Blockchain.hash(block)}`);
console.log(` - nonce: ${block.nonce}`);
return block;
}
}
}
}
module.exports = Blockchain;

37
js/index.js
View File

@ -1,37 +0,0 @@
const Blockchain = require("./blockchain");
const {send} = require("micro");
const blockchain = new Blockchain();
module.exports = async (request, response) => {
const route = request.url;
// Keep track of the peers that have contacted us
blockchain.addPeer(request.headers.host);
let output;
switch (route) {
case "/new_block":
output = blockchain.newBlock();
break;
case "/last_block":
output = blockchain.lastBlock();
break;
case "/get_peers":
output = blockchain.getPeers();
break;
case "/submit_transaction":
output = blockchain.addTransaction(transaction);
break;
default:
output = blockchain.lastBlock();
}
send(response, 200, output);
};

2828
js/package-lock.json generated
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File diff suppressed because it is too large Load Diff

17
js/package.json
View File

@ -1,17 +0,0 @@
{
"name": "blockchain",
"version": "1.0.0",
"description": "",
"main": "index.js",
"scripts": {
"dev": "nodemon blockchain.js",
"server": "micro-dev"
},
"author": "",
"license": "ISC",
"dependencies": {
"micro": "^9.3.4",
"micro-dev": "^3.0.0",
"nodemon": "^1.19.0"
}
}

253
poetry.lock generated Normal file
View File

@ -0,0 +1,253 @@
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18
pyproject.toml Normal file
View File

@ -0,0 +1,18 @@
[tool.poetry]
name = "blockchain"
version = "0.1.0"
description = ""
authors = ["Pavle Portic <pavle.portic@tilda.center>"]
[tool.poetry.dependencies]
python = "^3.8"
flask = "^1.1.1"
requests = "^2.22.0"
simplejson = "^3.17.0"
[tool.poetry.dev-dependencies]
python-dotenv = "^0.10.5"
[build-system]
requires = ["poetry>=0.12"]
build-backend = "poetry.masonry.api"

61
requirements.txt
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@ -1,2 +1,59 @@
flask==0.12.2
requests==2.18.4
certifi==2019.11.28 \
--hash=sha256:017c25db2a153ce562900032d5bc68e9f191e44e9a0f762f373977de9df1fbb3 \
--hash=sha256:25b64c7da4cd7479594d035c08c2d809eb4aab3a26e5a990ea98cc450c320f1f
chardet==3.0.4 \
--hash=sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691 \
--hash=sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae
click==7.0 \
--hash=sha256:2335065e6395b9e67ca716de5f7526736bfa6ceead690adf616d925bdc622b13 \
--hash=sha256:5b94b49521f6456670fdb30cd82a4eca9412788a93fa6dd6df72c94d5a8ff2d7
flask==1.1.1 \
--hash=sha256:45eb5a6fd193d6cf7e0cf5d8a5b31f83d5faae0293695626f539a823e93b13f6 \
--hash=sha256:13f9f196f330c7c2c5d7a5cf91af894110ca0215ac051b5844701f2bfd934d52
idna==2.8 \
--hash=sha256:ea8b7f6188e6fa117537c3df7da9fc686d485087abf6ac197f9c46432f7e4a3c \
--hash=sha256:c357b3f628cf53ae2c4c05627ecc484553142ca23264e593d327bcde5e9c3407
itsdangerous==1.1.0 \
--hash=sha256:b12271b2047cb23eeb98c8b5622e2e5c5e9abd9784a153e9d8ef9cb4dd09d749 \
--hash=sha256:321b033d07f2a4136d3ec762eac9f16a10ccd60f53c0c91af90217ace7ba1f19
jinja2==2.11.1 \
--hash=sha256:b0eaf100007721b5c16c1fc1eecb87409464edc10469ddc9a22a27a99123be49 \
--hash=sha256:93187ffbc7808079673ef52771baa950426fd664d3aad1d0fa3e95644360e250
markupsafe==1.1.1 \
--hash=sha256:09027a7803a62ca78792ad89403b1b7a73a01c8cb65909cd876f7fcebd79b161 \
--hash=sha256:e249096428b3ae81b08327a63a485ad0878de3fb939049038579ac0ef61e17e7 \
--hash=sha256:500d4957e52ddc3351cabf489e79c91c17f6e0899158447047588650b5e69183 \
--hash=sha256:b2051432115498d3562c084a49bba65d97cf251f5a331c64a12ee7e04dacc51b \
--hash=sha256:98c7086708b163d425c67c7a91bad6e466bb99d797aa64f965e9d25c12111a5e \
--hash=sha256:cd5df75523866410809ca100dc9681e301e3c27567cf498077e8551b6d20e42f \
--hash=sha256:43a55c2930bbc139570ac2452adf3d70cdbb3cfe5912c71cdce1c2c6bbd9c5d1 \
--hash=sha256:1027c282dad077d0bae18be6794e6b6b8c91d58ed8a8d89a89d59693b9131db5 \
--hash=sha256:62fe6c95e3ec8a7fad637b7f3d372c15ec1caa01ab47926cfdf7a75b40e0eac1 \
--hash=sha256:88e5fcfb52ee7b911e8bb6d6aa2fd21fbecc674eadd44118a9cc3863f938e735 \
--hash=sha256:ade5e387d2ad0d7ebf59146cc00c8044acbd863725f887353a10df825fc8ae21 \
--hash=sha256:09c4b7f37d6c648cb13f9230d847adf22f8171b1ccc4d5682398e77f40309235 \
--hash=sha256:79855e1c5b8da654cf486b830bd42c06e8780cea587384cf6545b7d9ac013a0b \
--hash=sha256:c8716a48d94b06bb3b2524c2b77e055fb313aeb4ea620c8dd03a105574ba704f \
--hash=sha256:7c1699dfe0cf8ff607dbdcc1e9b9af1755371f92a68f706051cc8c37d447c905 \
--hash=sha256:6dd73240d2af64df90aa7c4e7481e23825ea70af4b4922f8ede5b9e35f78a3b1 \
--hash=sha256:9add70b36c5666a2ed02b43b335fe19002ee5235efd4b8a89bfcf9005bebac0d \
--hash=sha256:24982cc2533820871eba85ba648cd53d8623687ff11cbb805be4ff7b4c971aff \
--hash=sha256:00bc623926325b26bb9605ae9eae8a215691f33cae5df11ca5424f06f2d1f473 \
--hash=sha256:717ba8fe3ae9cc0006d7c451f0bb265ee07739daf76355d06366154ee68d221e \
--hash=sha256:535f6fc4d397c1563d08b88e485c3496cf5784e927af890fb3c3aac7f933ec66 \
--hash=sha256:b1282f8c00509d99fef04d8ba936b156d419be841854fe901d8ae224c59f0be5 \
--hash=sha256:8defac2f2ccd6805ebf65f5eeb132adcf2ab57aa11fdf4c0dd5169a004710e7d \
--hash=sha256:46c99d2de99945ec5cb54f23c8cd5689f6d7177305ebff350a58ce5f8de1669e \
--hash=sha256:ba59edeaa2fc6114428f1637ffff42da1e311e29382d81b339c1817d37ec93c6 \
--hash=sha256:b00c1de48212e4cc9603895652c5c410df699856a2853135b3967591e4beebc2 \
--hash=sha256:9bf40443012702a1d2070043cb6291650a0841ece432556f784f004937f0f32c \
--hash=sha256:29872e92839765e546828bb7754a68c418d927cd064fd4708fab9fe9c8bb116b
requests==2.22.0 \
--hash=sha256:9cf5292fcd0f598c671cfc1e0d7d1a7f13bb8085e9a590f48c010551dc6c4b31 \
--hash=sha256:11e007a8a2aa0323f5a921e9e6a2d7e4e67d9877e85773fba9ba6419025cbeb4
urllib3==1.25.8 \
--hash=sha256:2f3db8b19923a873b3e5256dc9c2dedfa883e33d87c690d9c7913e1f40673cdc \
--hash=sha256:87716c2d2a7121198ebcb7ce7cccf6ce5e9ba539041cfbaeecfb641dc0bf6acc
werkzeug==0.16.1 \
--hash=sha256:1e0dedc2acb1f46827daa2e399c1485c8fa17c0d8e70b6b875b4e7f54bf408d2 \
--hash=sha256:b353856d37dec59d6511359f97f6a4b2468442e454bd1c98298ddce53cac1f04

7
run.py Normal file
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@ -0,0 +1,7 @@
#! /usr/bin/env python
# -*- coding: utf-8 -*-
# vim:fenc=utf-8
from blockchain import create_app
app = create_app()