def blockchain():
"""
return all blockchain data
"""
local_chain = sync.sync_local()
json_blocks = local_chain.block_list_to_dict()
return jsonify(json_blocks)
def transaction(txid):
local_chain = sync.sync_local()
block = local_chain.find_block_by_txid(txid)
if block:
return jsonify(block.to_dict()), 200
else:
return jsonify(message='Block not found'), 404
def mine_for_block(chain=None, rounds=STANDARD_ROUNDS, start_nonce=0):
if not chain:
chain = sync.sync_local() # gather last node
prev_block = chain.most_recent_block()
return mine_from_prev_block(prev_block,
rounds=rounds,
start_nonce=start_nonce)
def mine_for_block(chain=None,
rounds=STANDARD_ROUNDS,
start_nonce=0,
timestamp=None):
if not chain:
chain = sync.sync_local()
prev_block = chain.most_recent_block()
return mine_from_prev_block(prev_block,
rounds=rounds,
start_nonce=start_nonce,
timestamp=timestamp)
def blockchain():
'''
Shoots back the blockchain, which in our case, is a json list of hashes
with the block information which is:
index
timestamp
data
hash
prev_hash
'''
local_chain = sync.sync_local()
json_blocks = json.dumps(local_chain.block_list_dict())
return json_blocks
def blockchain():
'''
Shoots back the blockchain, which in our case, is a json list of hashes
with the block information which is:
index
timestamp
data
hash
prev_hash
'''
local_chain = sync.sync_local() # update if they've changed
# Convert our blocks into dictionaries
# so we can send them as json objects later
json_blocks = json.dumps(local_chain.block_list_dict())
return json_blocks
def mine_for_block(chain=None,
rounds=STANDARD_ROUNDS,
start_nonce=0,
timestamp=None):
'''
try and get the next block in the chain
'''
if not chain:
chain = sync.sync_local()
prev_block = chain.most_recent_block()
print(prev_block)
return mine_from_prev_block(prev_block,
rounds=rounds,
start_nonce=start_nonce,
timestamp=timestamp)
def blockchain():
'''
Shoots back the blockchain, which in our case, is a json list of hashes
with the block information which is:
index
timestamp
data
hash
prev_hash
'''
local_chain = sync.sync_local() #update if they've changed
# Convert our blocks into dictionaries
# so we can send them as json objects later
json_blocks = json.dumps(local_chain.block_list_dict())
return json_blocks
def blockchain():
'''
Shoots back the blockchain, which in our case, is a json list of hashes
with the block information which is:
index
timestamp
data
hash
prev_hash
'''
local_chain = sync.sync_local() # update if they've changed
print(local_chain.links)
# Convert our blocks into dictionaries
# so we can send them as json objects later
index = json.loads(request.args.get('i', '0'))
json_blocks = json.dumps(local_chain.block_list_dict()[index:])
return json_blocks
def new():
data = request.get_json()
# check required field
required = ['author', 'title', 'doc_hash', 's3_url']
if not all(k in data for k in required):
return jsonify({'result': 'Missing values'}), 400
# TODO
# check doc_hash
# if doc_hash already in blockchain database
# return Document was exist and txid
# push transaction to mongodb
local_chain = sync.sync_local()
if not local_chain.find_block_by_data_attr(key='doc_hash',
value=data['doc_hash']):
txid = mongo_conn.new_pending_transaction(data)
return jsonify({'message': 'New transaction was submitted'\
' to blockchain database',
' transaction_id': txid}), 201
else:
return jsonify({'message':
'This document is already on blockchain'}), 403
def mine_for_block(sched, mongo_conn):
print "Starting mining listener"
if mongo_conn.check_free_job():
print "Node is mining other transaction"
return False
try:
pending_tx = mongo_conn.query_a_pending_transaction()
if pending_tx:
# add to pending
mongo_conn.add_mining_tx(pending_tx['txid'])
print "Start minging transaction id %s " % pending_tx['txid']
blockchain = sync.sync_local()
sched.add_job(proof_of_work,
args=[blockchain, pending_tx],
id='mining')
sched.add_listener(mine_block_listener, EVENT_JOB_EXECUTED)
else:
print "No pending transaction"
except Exception as e:
## query pending transaction fail or not have any pending transaction
# if minging error, remove mining job
mongo_conn.remove_mining_tx(txid=pending_tx)
raise Exception(e)
def blockchain():
local_chain = sync.sync_local()
json_blocks = json.dumps(local_chain.block_list_dict())
return json_blocks
def mine_for_block(chain=None, rounds=STANDARD_ROUNDS, start_nonce=0, timestamp=None):
if not chain:
chain = sync.sync_local() #gather last node
prev_block = chain.most_recent_block()
return mine_from_prev_block(prev_block, rounds=rounds, start_nonce=start_nonce, timestamp=timestamp)