mirror of
https://github.com/bigchaindb/bigchaindb.git
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294 lines
11 KiB
Python
294 lines
11 KiB
Python
import json
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from time import sleep
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import cryptoconditions as cc
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from bigchaindb import Bigchain, util, crypto, exceptions
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b = Bigchain()
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"""
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Create a Digital Asset
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"""
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# create a test user
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testuser1_priv, testuser1_pub = crypto.generate_key_pair()
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# define a digital asset data payload
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digital_asset_payload = {'msg': 'Hello BigchainDB!'}
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# a create transaction uses the operation `CREATE` and has no inputs
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tx = b.create_transaction(b.me, testuser1_pub, None, 'CREATE', payload=digital_asset_payload)
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# all transactions need to be signed by the user creating the transaction
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tx_signed = b.sign_transaction(tx, b.me_private)
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# write the transaction to the bigchain
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# the transaction will be stored in a backlog where it will be validated,
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# included in a block, and written to the bigchain
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b.write_transaction(tx_signed)
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# sleep(10)
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#
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# """
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# Read the Creation Transaction from the DB
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# """
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#
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# tx_retrieved = b.get_transaction(tx_signed['id'])
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#
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# print(json.dumps(tx_retrieved, sort_keys=True, indent=4, separators=(',', ':')))
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#
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# print(testuser1_pub)
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# print(b.me)
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#
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# print(tx_retrieved['id'])
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#
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# """
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# Transfer the Digital Asset
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# """
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#
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# # create a second testuser
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# testuser2_priv, testuser2_pub = crypto.generate_key_pair()
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#
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# # retrieve the transaction with condition id
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# tx_retrieved_id = b.get_owned_ids(testuser1_pub).pop()
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# print(json.dumps(tx_retrieved_id, sort_keys=True, indent=4, separators=(',', ':')))
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#
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# # create a transfer transaction
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# tx_transfer = b.create_transaction(testuser1_pub, testuser2_pub, tx_retrieved_id, 'TRANSFER')
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#
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# # sign the transaction
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# tx_transfer_signed = b.sign_transaction(tx_transfer, testuser1_priv)
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#
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# # write the transaction
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# b.write_transaction(tx_transfer_signed)
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#
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# sleep(10)
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#
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# # check if the transaction is already in the bigchain
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# tx_transfer_retrieved = b.get_transaction(tx_transfer_signed['id'])
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# print(json.dumps(tx_transfer_retrieved, sort_keys=True, indent=4, separators=(',', ':')))
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#
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# """
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# Double Spends
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# """
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#
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# # create another transfer transaction with the same input
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# tx_transfer2 = b.create_transaction(testuser1_pub, testuser2_pub, tx_retrieved_id, 'TRANSFER')
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#
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# # sign the transaction
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# tx_transfer_signed2 = b.sign_transaction(tx_transfer2, testuser1_priv)
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#
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# # check if the transaction is valid
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# try:
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# b.validate_transaction(tx_transfer_signed2)
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# except exceptions.DoubleSpend as e:
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# print(e)
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#
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# """
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# Multiple Owners
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# """
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#
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# # Create a new asset and assign it to multiple owners
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# tx_multisig = b.create_transaction(b.me, [testuser1_pub, testuser2_pub], None, 'CREATE')
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#
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# # Have the federation sign the transaction
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# tx_multisig_signed = b.sign_transaction(tx_multisig, b.me_private)
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# b.write_transaction(tx_multisig_signed)
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#
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# # wait a few seconds for the asset to appear on the blockchain
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# sleep(10)
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#
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# # retrieve the transaction
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# tx_multisig_retrieved = b.get_transaction(tx_multisig_signed['id'])
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#
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# print(json.dumps(tx_multisig_retrieved, sort_keys=True, indent=4, separators=(',', ':')))
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#
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# testuser3_priv, testuser3_pub = crypto.generate_key_pair()
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#
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# tx_multisig_retrieved_id = b.get_owned_ids(testuser2_pub).pop()
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# tx_multisig_transfer = b.create_transaction([testuser1_pub, testuser2_pub], testuser3_pub, tx_multisig_retrieved_id, 'TRANSFER')
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# tx_multisig_transfer_signed = b.sign_transaction(tx_multisig_transfer, [testuser1_priv, testuser2_priv])
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#
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# b.write_transaction(tx_multisig_transfer_signed)
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#
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# # wait a few seconds for the asset to appear on the blockchain
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# sleep(10)
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#
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# # retrieve the transaction
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# tx_multisig_retrieved = b.get_transaction(tx_multisig_transfer_signed['id'])
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#
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# print(json.dumps(tx_multisig_transfer_signed, sort_keys=True, indent=4, separators=(',', ':')))
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#
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# """
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# Multiple Inputs and Outputs
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# """
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# for i in range(3):
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# tx_mimo_asset = b.create_transaction(b.me, testuser1_pub, None, 'CREATE')
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# tx_mimo_asset_signed = b.sign_transaction(tx_mimo_asset, b.me_private)
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# b.write_transaction(tx_mimo_asset_signed)
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#
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# sleep(10)
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#
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# # get inputs
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# owned_mimo_inputs = b.get_owned_ids(testuser1_pub)
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# print(len(owned_mimo_inputs))
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#
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# # create a transaction
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# tx_mimo = b.create_transaction(testuser1_pub, testuser2_pub, owned_mimo_inputs, 'TRANSFER')
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# tx_mimo_signed = b.sign_transaction(tx_mimo, testuser1_priv)
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#
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# # write the transaction
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# b.write_transaction(tx_mimo_signed)
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#
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# print(json.dumps(tx_mimo_signed, sort_keys=True, indent=4, separators=(',', ':')))
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#
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# """
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# Threshold Conditions
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# """
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#
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# # create some new testusers
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# thresholduser1_priv, thresholduser1_pub = crypto.generate_key_pair()
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# thresholduser2_priv, thresholduser2_pub = crypto.generate_key_pair()
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# thresholduser3_priv, thresholduser3_pub = crypto.generate_key_pair()
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#
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# # retrieve the last transaction of testuser2
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# tx_retrieved_id = b.get_owned_ids(testuser2_pub).pop()
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#
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# # create a base template for a 1-input/3-output transaction
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# threshold_tx = b.create_transaction(testuser2_pub, [thresholduser1_pub, thresholduser2_pub, thresholduser3_pub],
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# tx_retrieved_id, 'TRANSFER')
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#
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# # create a 2-out-of-3 Threshold Cryptocondition
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# threshold_condition = cc.ThresholdSha256Fulfillment(threshold=2)
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# threshold_condition.add_subfulfillment(cc.Ed25519Fulfillment(public_key=thresholduser1_pub))
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# threshold_condition.add_subfulfillment(cc.Ed25519Fulfillment(public_key=thresholduser2_pub))
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# threshold_condition.add_subfulfillment(cc.Ed25519Fulfillment(public_key=thresholduser3_pub))
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#
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# # update the condition in the newly created transaction
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# threshold_tx['transaction']['conditions'][0]['condition'] = {
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# 'details': json.loads(threshold_condition.serialize_json()),
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# 'uri': threshold_condition.condition.serialize_uri()
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# }
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#
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# # conditions have been updated, so hash needs updating
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# threshold_tx['id'] = util.get_hash_data(threshold_tx)
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#
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# # sign the transaction
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# threshold_tx_signed = b.sign_transaction(threshold_tx, testuser2_priv)
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#
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# # write the transaction
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# b.write_transaction(threshold_tx_signed)
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#
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# sleep(10)
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#
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# # check if the transaction is already in the bigchain
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# tx_threshold_retrieved = b.get_transaction(threshold_tx_signed['id'])
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# print(json.dumps(tx_threshold_retrieved, sort_keys=True, indent=4, separators=(',', ':')))
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#
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# thresholduser4_priv, thresholduser4_pub = crypto.generate_key_pair()
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#
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# # retrieve the last transaction of thresholduser1_pub
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# tx_retrieved_id = b.get_owned_ids(thresholduser1_pub).pop()
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#
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# # create a base template for a 2-input/1-output transaction
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# threshold_tx_transfer = b.create_transaction([thresholduser1_pub, thresholduser2_pub, thresholduser3_pub],
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# thresholduser4_pub, tx_retrieved_id, 'TRANSFER')
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#
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# # parse the threshold cryptocondition
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# threshold_fulfillment = cc.Fulfillment.from_json(threshold_tx['transaction']['conditions'][0]['condition']['details'])
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#
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# subfulfillment1 = threshold_fulfillment.get_subcondition_from_vk(thresholduser1_pub)[0]
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# subfulfillment2 = threshold_fulfillment.get_subcondition_from_vk(thresholduser2_pub)[0]
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# subfulfillment3 = threshold_fulfillment.get_subcondition_from_vk(thresholduser3_pub)[0]
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#
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#
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# # get the fulfillment message to sign
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# threshold_tx_fulfillment_message = util.get_fulfillment_message(threshold_tx_transfer,
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# threshold_tx_transfer['transaction']['fulfillments'][0],
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# serialized=True)
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#
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# # clear the subconditions of the threshold fulfillment, they will be added again after signing
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# threshold_fulfillment.subconditions = []
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#
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# # sign and add the subconditions until threshold of 2 is reached
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# subfulfillment1.sign(threshold_tx_fulfillment_message, crypto.SigningKey(thresholduser1_priv))
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# threshold_fulfillment.add_subfulfillment(subfulfillment1)
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# subfulfillment2.sign(threshold_tx_fulfillment_message, crypto.SigningKey(thresholduser2_priv))
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# threshold_fulfillment.add_subfulfillment(subfulfillment2)
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#
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# # Add remaining (unfulfilled) fulfillment as a condition
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# threshold_fulfillment.add_subcondition(subfulfillment3.condition)
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#
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# assert threshold_fulfillment.validate(threshold_tx_fulfillment_message) == True
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#
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# threshold_tx_transfer['transaction']['fulfillments'][0]['fulfillment'] = threshold_fulfillment.serialize_uri()
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#
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# assert b.verify_signature(threshold_tx_transfer) == True
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#
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# assert b.validate_transaction(threshold_tx_transfer) == threshold_tx_transfer
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#
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# b.write_transaction(threshold_tx_transfer)
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#
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# print(json.dumps(threshold_tx_transfer, sort_keys=True, indent=4, separators=(',', ':')))
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"""
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Hashlocked Conditions
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"""
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# Create a hash-locked asset without any new_owners
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hashlock_tx = b.create_transaction(b.me, None, None, 'CREATE')
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# Define a secret that will be hashed - fulfillments need to guess the secret
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secret = b'much secret! wow!'
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first_tx_condition = cc.PreimageSha256Fulfillment(preimage=secret)
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# The conditions list is empty, so we need to append a new condition
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hashlock_tx['transaction']['conditions'].append({
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'condition': {
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'details': json.loads(first_tx_condition.serialize_json()),
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'uri': first_tx_condition.condition.serialize_uri()
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},
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'cid': 0,
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'new_owners': None
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})
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# Conditions have been updated, so hash needs updating
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hashlock_tx['id'] = util.get_hash_data(hashlock_tx)
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# The asset needs to be signed by the current_owner
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hashlock_tx_signed = b.sign_transaction(hashlock_tx, b.me_private)
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# Some validations
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assert b.validate_transaction(hashlock_tx_signed) == hashlock_tx_signed
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assert b.is_valid_transaction(hashlock_tx_signed) == hashlock_tx_signed
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b.write_transaction(hashlock_tx_signed)
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print(json.dumps(hashlock_tx_signed, sort_keys=True, indent=4, separators=(',', ':')))
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sleep(10)
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hashlockuser_priv, hashlockuser_pub = crypto.generate_key_pair()
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# create hashlock fulfillment tx
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hashlock_fulfill_tx = b.create_transaction(None, hashlockuser_priv, {'txid': hashlock_tx['id'], 'cid': 0}, 'TRANSFER')
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# try a wrong secret
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hashlock_fulfill_tx_fulfillment = cc.PreimageSha256Fulfillment(preimage=b'')
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hashlock_fulfill_tx['transaction']['fulfillments'][0]['fulfillment'] = \
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hashlock_fulfill_tx_fulfillment.serialize_uri()
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assert b.is_valid_transaction(hashlock_fulfill_tx) == False
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# provide the right secret
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hashlock_fulfill_tx_fulfillment = cc.PreimageSha256Fulfillment(preimage=secret)
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hashlock_fulfill_tx['transaction']['fulfillments'][0]['fulfillment'] = \
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hashlock_fulfill_tx_fulfillment.serialize_uri()
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assert b.validate_transaction(hashlock_fulfill_tx) == hashlock_fulfill_tx
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assert b.is_valid_transaction(hashlock_fulfill_tx) == hashlock_fulfill_tx
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b.write_transaction(hashlock_fulfill_tx)
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print(json.dumps(hashlock_fulfill_tx, sort_keys=True, indent=4, separators=(',', ':')))
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