Block.py

import hashlib as hasher
import datetime as date

# We define a block and the genesis block creation method within this file to enfore 
# modularity
# Originally adapted from [https://gist.github.com/aunyks/47d157f8bc7d1829a729c2a6a919c173]
# Authored by Siddharth Kulkarni and Sharan Duggirala November 18th, 2017

# Define what a Coffeecoin block is, and what it contains as a class 
class Block:
  def __init__(self, index, timestamp, data, previous_hash):
    self.index = index
    self.timestamp = timestamp
    self.data = data
    self.previous_hash = previous_hash
    self.hash = self.hash_block()
  
  # Currently using the SHA 256 Hashing function #### THIS SHOULD BE MODIFIED #### 
  def hash_block(self):
    sha = hasher.sha256()
    sha.update(str(self.index) + str(self.timestamp) + str(self.data) + str(self.previous_hash))
    return sha.hexdigest()

# Generate genesis block
def create_genesis_block():
  # Manually construct a block with
  # index zero and arbitrary previous hash
  return Block(0, date.datetime.now(), {
    "transactions": None
  }, "0")