Revert "revert get_tx_by_payload_hash"

This reverts commit fb2cd532a9462ae4fc3c50056f01b37467816848.
This commit is contained in:
ryan 2016-05-23 10:17:12 +02:00
parent fb2cd532a9
commit 5bc66a28c1

View File

@ -177,24 +177,36 @@ class Bigchain(object):
def get_tx_by_payload_hash(self, payload_hash):
"""Retrieves transactions related to a digital asset.
When creating a transaction one of the optional arguments is the `payload`. The payload is a generic
dict that contains information about the digital asset.
To make it easy to query the bigchain for that digital asset we create a sha3-256 hash of the
serialized payload and store it with the transaction. This makes it easy for developers to keep track
of their digital assets in bigchain.
Args:
payload_hash (str): sha3-256 hash of the serialized payload.
Returns:
A list of transactions containing that payload. If no transaction exists with that payload it
returns an empty list `[]`
"""
cursor = r.table('bigchain') \
.get_all(payload_hash, index='payload_hash') \
.run(self.conn)
# First, get information on all blocks which contain this hash
blocks = self.search_block_election_on_index(payload_hash, 'payload_hash')
if blocks:
validity = {block['id']: self.block_election_status(block) for block in blocks}
transactions = list(cursor)
return transactions
# disregard invalid blocks
validity = {_id: status for _id, status in validity.items() if status != 'invalid'}
cursor = r.table('bigchain').get_all(*list(validity.keys()))\
.get_all(payload_hash, index='payload_hash')\
.run(self.conn)
return list(cursor)
else:
return []
def get_spent(self, tx_input):
"""Check if a `txid` was already used as an input.