def check_if_initial_block(file_path, bc):
if os.path.exists(os.environ['BCHOC_FILE_PATH']):
return True
else:
initial_block = Block.create_initial_block() # create initial block
block_bytes = pack_block(
initial_block) #pack the inital block into bytes
with open(os.environ['BCHOC_FILE_PATH'],
'wb') as fp: #open a file to store block
fp.write(block_bytes) #write the initial block to binary file
fp.write(
initial_block.data
) # write the block data to file (make sure the string is in bytes)
print('Blockchain file not found. Created INITIAL block.')
bc.blocks.append(initial_block)
return False
def write_to_file(block):
with open(os.environ['BCHOC_FILE_PATH'], 'ab') as fp:
block_bytes = pack_block(block)
fp.write(block_bytes)
fp.write(block.data)
block_bytes = pack_block(block)
fp.write(block_bytes)
fp.write(block.data)
#=======================================================================================================================================================
if sys.argv[1] == "init":
if len(sys.argv) > 2: #make sure we aren't adding extra arguments
sys.exit('Invalid Parameters')
if os.path.exists(
os.environ['BCHOC_FILE_PATH']) == False: # if file doesn't exist
initial_block = Block.create_initial_block() # create initial block
#printBlock(initial_block)
block_bytes = pack_block(
initial_block) #pack the inital block into bytes
with open(os.environ['BCHOC_FILE_PATH'],
'wb') as fp: #open a file to store block
fp.write(block_bytes) #write the initial block to binary file
fp.write(
initial_block.data
) # write the block data to file (make sure the string is in bytes)
print('Blockchain file not found. Created INITIAL block.')
else: #no blockchain file , need to create one with initial block
with open(os.environ['BCHOC_FILE_PATH'], 'rb') as fp:
block_bytes = fp.read(68) #read 68 bytes of struct header
initial_block = unpack(
block_bytes) #unpack the bytes and return a block object
#printBlock(initial_block)
print('Blockchain file found with INITIAL block.')