Merge pull request #22 from 20esaua/patch-4

Add Block.create()
master
Kevin Froman 2018-06-04 15:22:05 -05:00 committed by GitHub
commit 6ff3c2c519
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1 changed files with 53 additions and 0 deletions

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@ -529,6 +529,59 @@ class Block:
return (None if not file is None else buffer) return (None if not file is None else buffer)
def create(data = None, chunksize = 4999000, file = None, type = 'chunk', sign = True):
'''
Creates a chain of blocks to store larger amounts of data
The chunksize is set to 4999000 because it provides the least amount of PoW for the most amount of data.
TODO: Add docs
'''
blocks = list()
# initial datatype checks
if data is None and file is None:
return blocks
elif not (file is None or (isinstance(file, str) and os.path.exists(file))):
return blocks
elif isinstance(file, str):
file = open(file, 'rb')
if isinstance(data, str):
data = str(data)
if not file is None:
while True:
# read chunksize bytes from the file
content = file.read(chunksize)
# if it is the end of the file, exit
if not content:
break
# create block
block = Block()
block.setType(type)
block.setContent(content)
block.setParent((blocks[-1] if len(blocks) != 0 else None))
hash = block.save(sign = sign)
# remember the hash in cache
blocks.append(hash)
elif not data is None:
for content in [data[n:n + chunksize] for n in range(0, len(data), chunksize)]:
# create block
block = Block()
block.setType(type)
block.setContent(content)
block.setParent((blocks[-1] if len(blocks) != 0 else None))
hash = block.save(sign = sign)
# remember the hash in cache
blocks.append(hash)
return blocks
def exists(hash): def exists(hash):
''' '''
Checks if a block is saved to file or not Checks if a block is saved to file or not