Merge pull request #41 from dvf/dvf/tests
Basic Tests, Some Clean-up, Travis Integration
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language: python
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python:
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- 3.6
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- nightly
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install:
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- pip install pipenv
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- pipenv install --dev
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script:
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- pipenv run python -m unittest
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@ -1,5 +1,7 @@
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# Learn Blockchains by Building One
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[![Build Status](https://travis-ci.org/dvf/blockchain.svg?branch=master)](https://travis-ci.org/dvf/blockchain)
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This is the source code for my post on [Building a Blockchain](https://medium.com/p/117428612f46).
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## Installation
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import hashlib
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import json
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from time import time
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from typing import Any, Dict, List, Optional
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from urllib.parse import urlparse
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from uuid import uuid4
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@ -18,7 +17,7 @@ class Blockchain:
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# Create the genesis block
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self.new_block(previous_hash='1', proof=100)
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def register_node(self, address: str) -> None:
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def register_node(self, address):
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"""
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Add a new node to the list of nodes
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@ -28,7 +27,7 @@ class Blockchain:
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parsed_url = urlparse(address)
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self.nodes.add(parsed_url.netloc)
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def valid_chain(self, chain: List[Dict[str, Any]]) -> bool:
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def valid_chain(self, chain):
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"""
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Determine if a given blockchain is valid
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@ -57,7 +56,7 @@ class Blockchain:
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return True
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def resolve_conflicts(self) -> bool:
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def resolve_conflicts(self):
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"""
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This is our consensus algorithm, it resolves conflicts
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by replacing our chain with the longest one in the network.
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@ -91,7 +90,7 @@ class Blockchain:
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return False
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def new_block(self, proof: int, previous_hash: Optional[str]) -> Dict[str, Any]:
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def new_block(self, proof, previous_hash):
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"""
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Create a new Block in the Blockchain
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@ -114,7 +113,7 @@ class Blockchain:
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self.chain.append(block)
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return block
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def new_transaction(self, sender: str, recipient: str, amount: int) -> int:
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def new_transaction(self, sender, recipient, amount):
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"""
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Creates a new transaction to go into the next mined Block
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@ -132,11 +131,11 @@ class Blockchain:
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return self.last_block['index'] + 1
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@property
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def last_block(self) -> Dict[str, Any]:
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def last_block(self):
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return self.chain[-1]
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@staticmethod
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def hash(block: Dict[str, Any]) -> str:
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def hash(block):
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"""
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Creates a SHA-256 hash of a Block
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@ -147,7 +146,7 @@ class Blockchain:
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block_string = json.dumps(block, sort_keys=True).encode()
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return hashlib.sha256(block_string).hexdigest()
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def proof_of_work(self, last_proof: int) -> int:
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def proof_of_work(self, last_proof):
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"""
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Simple Proof of Work Algorithm:
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- Find a number p' such that hash(pp') contains leading 4 zeroes, where p is the previous p'
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return proof
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@staticmethod
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def valid_proof(last_proof: int, proof: int) -> bool:
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def valid_proof(last_proof, proof):
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"""
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Validates the Proof
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import hashlib
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import json
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from unittest import TestCase
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from blockchain import Blockchain
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class BlockchainTestCase(TestCase):
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def setUp(self):
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self.blockchain = Blockchain()
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def create_block(self, proof=123, previous_hash='abc'):
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self.blockchain.new_block(proof, previous_hash)
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def create_transaction(self, sender='a', recipient='b', amount=1):
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self.blockchain.new_transaction(
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sender=sender,
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recipient=recipient,
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amount=amount
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)
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class TestRegisterNodes(BlockchainTestCase):
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def test_valid_nodes(self):
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blockchain = Blockchain()
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blockchain.register_node('http://192.168.0.1:5000')
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self.assertIn('192.168.0.1:5000', blockchain.nodes)
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def test_malformed_nodes(self):
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blockchain = Blockchain()
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blockchain.register_node('http//192.168.0.1:5000')
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self.assertNotIn('192.168.0.1:5000', blockchain.nodes)
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def test_idempotency(self):
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blockchain = Blockchain()
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blockchain.register_node('http://192.168.0.1:5000')
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blockchain.register_node('http://192.168.0.1:5000')
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assert len(blockchain.nodes) == 1
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class TestBlocksAndTransactions(BlockchainTestCase):
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def test_block_creation(self):
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self.create_block()
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latest_block = self.blockchain.last_block
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# The genesis block is create at initialization, so the length should be 2
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assert len(self.blockchain.chain) == 2
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assert latest_block['index'] == 2
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assert latest_block['timestamp'] is not None
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assert latest_block['proof'] == 123
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assert latest_block['previous_hash'] == 'abc'
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def test_create_transaction(self):
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self.create_transaction()
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transaction = self.blockchain.current_transactions[-1]
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assert transaction
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assert transaction['sender'] == 'a'
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assert transaction['recipient'] == 'b'
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assert transaction['amount'] == 1
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def test_block_resets_transactions(self):
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self.create_transaction()
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initial_length = len(self.blockchain.current_transactions)
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self.create_block()
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current_length = len(self.blockchain.current_transactions)
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assert initial_length == 1
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assert current_length == 0
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def test_return_last_block(self):
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self.create_block()
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created_block = self.blockchain.last_block
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assert len(self.blockchain.chain) == 2
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assert created_block is self.blockchain.chain[-1]
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class TestHashingAndProofs(BlockchainTestCase):
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def test_hash_is_correct(self):
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self.create_block()
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new_block = self.blockchain.last_block
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new_block_json = json.dumps(self.blockchain.last_block, sort_keys=True).encode()
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new_hash = hashlib.sha256(new_block_json).hexdigest()
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assert len(new_hash) == 64
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assert new_hash == self.blockchain.hash(new_block)
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