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0c4d6ec906
1. Save pre-commit state in the beginning of end block. 2. Provide an interface for custom elections to rollback on crash recovery. 3. Simplify pre-commit management. 4. Add crash recovery for updert-validator and chain migration elecitons.
113 lines
3.7 KiB
Python
113 lines
3.7 KiB
Python
# Copyright BigchainDB GmbH and BigchainDB contributors
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# SPDX-License-Identifier: (Apache-2.0 AND CC-BY-4.0)
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# Code is Apache-2.0 and docs are CC-BY-4.0
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import base58
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import base64
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import random
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from functools import singledispatch
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from bigchaindb.backend.localmongodb.connection import LocalMongoDBConnection
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from bigchaindb.backend.schema import TABLES
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from bigchaindb.common import crypto
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from bigchaindb.elections.election import Election, Vote
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from bigchaindb.tendermint_utils import key_to_base64
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@singledispatch
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def flush_db(connection, dbname):
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raise NotImplementedError
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@flush_db.register(LocalMongoDBConnection)
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def flush_localmongo_db(connection, dbname):
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for t in TABLES:
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getattr(connection.conn[dbname], t).delete_many({})
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def generate_block(bigchain):
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from bigchaindb.common.crypto import generate_key_pair
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from bigchaindb.models import Transaction
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alice = generate_key_pair()
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tx = Transaction.create([alice.public_key],
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[([alice.public_key], 1)],
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asset=None)\
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.sign([alice.private_key])
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code, message = bigchain.write_transaction(tx, 'broadcast_tx_commit')
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assert code == 202
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def to_inputs(election, i, ed25519_node_keys):
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input0 = election.to_inputs()[i]
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votes = election.outputs[i].amount
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public_key0 = input0.owners_before[0]
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key0 = ed25519_node_keys[public_key0]
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return (input0, votes, key0)
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def gen_vote(election, i, ed25519_node_keys):
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(input_i, votes_i, key_i) = to_inputs(election, i, ed25519_node_keys)
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election_pub_key = Election.to_public_key(election.id)
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return Vote.generate([input_i],
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[([election_pub_key], votes_i)],
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election_id=election.id)\
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.sign([key_i.private_key])
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def generate_validators(powers):
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"""Generates an arbitrary number of validators with random public keys.
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The object under the `storage` key is in the format expected by DB.
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The object under the `eleciton` key is in the format expected by
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the upsert validator election.
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`public_key`, `private_key` are in the format used for signing transactions.
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Args:
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powers: A list of intergers representing the voting power to
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assign to the corresponding validators.
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"""
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validators = []
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for power in powers:
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kp = crypto.generate_key_pair()
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validators.append({
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'storage': {
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'public_key': {
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'value': key_to_base64(base58.b58decode(kp.public_key).hex()),
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'type': 'ed25519-base64',
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},
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'voting_power': power,
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},
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'election': {
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'node_id': f'node-{random.choice(range(100))}',
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'power': power,
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'public_key': {
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'value': base64.b16encode(base58.b58decode(kp.public_key)).decode('utf-8'),
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'type': 'ed25519-base16',
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},
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},
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'public_key': kp.public_key,
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'private_key': kp.private_key,
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})
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return validators
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def generate_election(b, cls, public_key, private_key, asset_data, voter_keys):
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voters = cls.recipients(b)
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election = cls.generate([public_key],
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voters,
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asset_data,
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None).sign([private_key])
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votes = [Vote.generate([election.to_inputs()[i]],
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[([Election.to_public_key(election.id)], power)],
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election.id) for i, (_, power) in enumerate(voters)]
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for key, v in zip(voter_keys, votes):
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v.sign([key])
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return election, votes
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