new requirements.txt

app.py

@@ -1,12 +1,11 @@
 #!/usr/bin/env python
-"""Flask server to serve the block API."""
 
-import json
 from time import time
-import argparse
-from uuid import uuid4
 from flask import Flask, request
+import json
+from uuid import uuid4
 from blockchain import Blockchain, Transaction, Block
+import argparse
 
 parser = argparse.ArgumentParser(description="A blockchain simulation")
 parser.add_argument("-p", "--port", type=int, help="Port number", default=80)
@@ -16,19 +15,18 @@ port = args.port
 
 app = Flask(__name__)
 
-NODE_IDENTIFIER = str(uuid4()).replace("-", "")
+node_identifier = str(uuid4()).replace("-", "")
 
 blockchain = Blockchain()
 
 
 @app.route("/mine", methods=["GET"])
 def mine():
-    """Mine Samycoin."""
     last_block = blockchain.blocks[-1]
     last_proof = last_block.proof
     proof = blockchain.proof_of_work(last_proof)
 
-    transaction = Transaction("Network", NODE_IDENTIFIER, 50)
+    transaction = Transaction("Network", node_identifier, 50)
     blockchain.new_transaction(transaction)
     block = Block(
         len(blockchain.blocks) + 1,
@@ -44,7 +42,6 @@ def mine():
 
 @app.route("/transactions/new", methods=["POST"])
 def new_transaction():
-    """Submit a new transaction."""
     values = request.get_json()
     transaction = Transaction(values["sender"], values["recipient"], values["amount"])
     blockchain.new_transaction(transaction)
@@ -54,29 +51,27 @@ def new_transaction():
 
 @app.route("/chain", methods=["GET"])
 def chain():
-    """Display the block chain."""
     return json.dumps([b.__dict__ for b in blockchain.blocks])
 
 
 @app.route("/nodes", methods=["GET"])
 def nodes():
-    """List known nodes."""
     return json.dumps(list(blockchain.nodes))
 
 
 @app.route("/register", methods=["POST"])
 def register_nodes():
-    """Register a new node."""
-    json_values = request.get_json()
-    for node in json_values["nodes"]:
+    values = request.get_json()
+    nodes = values["nodes"]
+
+    for node in nodes:
         blockchain.register_node(node)
 
     return "New node has been added\n"
 
 
 @app.route("/resolve", methods=["GET"])
-def resolve():
-    """Resolve the blockchain."""
+def consensus():
     replaced = blockchain.resolve_conflicts()
 
     if replaced:

blockchain.py

@@ -3,14 +3,13 @@
 import hashlib
 from time import time
 import json
-from urllib.parse import urlparse
 import requests
+from urllib.parse import urlparse
 
 DIFFICULTY = 4
 
 
 class Block:
-    """Block of the blockkchain."""
     def __init__(self, index, timestamp, transactions, previous_hash, proof):
         self.index = index
         self.timestamp = timestamp
@@ -20,7 +19,6 @@ class Block:
         self.hash = self.hash()
 
     def hash(self):
-        """Hash the block using sha256."""
         data = self.__dict__
         data["transactions"] = [t.__dict__ for t in self.transactions]
         block_string = json.dumps(data, sort_keys=True).encode()
@@ -31,7 +29,6 @@ class Block:
 
 
 class Transaction:
-    """Transaction class."""
     def __init__(self, sender, recipient, amount):
         self.sender = sender
         self.recipient = recipient
@@ -42,7 +39,6 @@ class Transaction:
 
 
 class Blockchain:
-    """Blockchain class."""
     def __init__(self):
         self.blocks = []
         self.blocks.append(self.create_first_block())
@@ -50,25 +46,20 @@ class Blockchain:
         self.nodes = set()
 
     def register_node(self, address):
-        """Register a new node."""
         parsed_url = urlparse(address).netloc
         self.nodes.add(parsed_url)
 
     def create_first_block(self):
-        """create the initial block."""
         return Block(1, time(), [], 1, 100)
 
     def new_transaction(self, transaction):
-        """Add a new transaction."""
         self.transactions.append(transaction)
 
     def new_block(self, block):
-        """Add a new block."""
         self.transactions = []
         self.blocks.append(block)
 
     def proof_of_work(self, last_proof):
-        """Computes the proof."""
         proof = 0
         while not self.valid_proof(proof, last_proof):
             proof += 1
@@ -76,13 +67,11 @@ class Blockchain:
 
     @staticmethod
     def valid_proof(proof, last_proof):
-        """Tests proof."""
         guess = f"{last_proof}{proof}".encode()
         guess_hash = hashlib.sha256(guess).hexdigest()
         return guess_hash[:DIFFICULTY] == "0" * DIFFICULTY
 
     def valid_chain(self, chain):
-        """Tests the validity of a chain."""
         last_block = chain[0]
         current_index = 1
 
@@ -101,7 +90,6 @@ class Blockchain:
         return True
 
     def json_to_transactions(self, transactions_json):
-        """Converts json to a list of transactions."""
         transactions = [
             Transaction(
                 transaction["sender"],
@@ -114,7 +102,6 @@ class Blockchain:
         return transactions
 
     def json_to_chain(self, chain_json):
-        """Convert json to a chain."""
         chain = [
             Block(
                 block["index"],
@@ -129,7 +116,6 @@ class Blockchain:
         return chain
 
     def resolve_conflicts(self):
-        """Resolve conflicts using the consensus algorithm."""
         neighbours = self.nodes
         new_chain = None
         max_lengh = len(self.blocks)

requirements.txt

@@ -1,2 +1,19 @@
-Flask==2.0.2
+#
+# These requirements were autogenerated by pipenv
+# To regenerate from the project's Pipfile, run:
+#
+#    pipenv lock --requirements
+#
+
+-i https://pypi.org/simple
+certifi==2021.10.8
+charset-normalizer==2.0.12; python_version >= '3'
+click==8.0.4; python_version >= '3.6'
+flask==2.0.2
+idna==3.3; python_version >= '3'
+itsdangerous==2.1.0; python_version >= '3.7'
+jinja2==3.0.3; python_version >= '3.6'
+markupsafe==2.1.0; python_version >= '3.7'
 requests==2.27.1
+urllib3==1.26.8; python_version >= '2.7' and python_version not in '3.0, 3.1, 3.2, 3.3, 3.4' and python_version < '4'
+werkzeug==2.0.3; python_version >= '3.6'