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取消

TxTypeCancel 取消事务池中具有相同 nonce 的事务的执行。 当已提交的交易在一定时间内似乎未得到处理时,这种交易类型就很有用。

web3py_ext导入extend,将 web3 扩展为 kaia web3

eth_accountweb3py_extcytoolz 中导入必要的实用程序

使用 kairos testnet 端点创建 Web3 实例

此外,您还可以将提供商 URL 从 kairos 更改为 quicknode

从私人密钥加载账户

发送alue transfer tx。 It will be in the tx pool and canceled before execution. 如果取消 tx 已执行,则会失败。

创建一个TxType.CANCEL类型的空事务。 您可以使用 empty_tx 工具来获取已填写默认字段的 tx。

使用 merge 工具将 fromnonce 字段合并到空 tx 中。

使 nonce 与之前发送的 value transfer tx 相同。 您需要设置要取消的相同的 tx nonce

使用 fill_transaction 为交易对象添加更多参数,如 gas 限制...

用用户的私钥签署cancel tx

从已签署的 tx 中的签名中恢复签名人地址

您可以使用Account.decode_transaction工具对 RLP 编码的 tx 进行解码,如果您想让输出格式更漂亮,请使用to_pretty工具。

tx发送到区块链。 它将返回 tx 哈希值,用于等待接收

如果交易已在区块链中完成,wait_for_transaction_receipt 方法会返回交易收据。

最后,得到结果。

cancel_example.py

from web3py_ext import extend
from web3 import Web3
from eth_account import Account
from web3py_ext.transaction.transaction import (
empty_tx,
fill_transaction,
TxType
)
from web3py_ext.utils.klaytn_utils import to_pretty
from cytoolz import merge
w3 = Web3(Web3.HTTPProvider(
'https://public-en-kairos.node.kaia.io'
))
def web3_cancel_sign_recover():
user1 = Account.from_key('0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8')
value_transfer_tx = empty_tx(TxType.VALUE_TRANSFER)
value_transfer_tx = merge(value_transfer_tx, {
'from':user1.address,
'to':user1.address,
'value':Web3.to_peb(10, "klay")
})
value_transfer_tx = fill_transaction(value_transfer_tx, w3)
signed_tx = Account.sign_transaction(value_transfer_tx, user1.key)
w3.eth.send_raw_transaction(signed_tx.rawTransaction)
cancel_tx = empty_tx(TxType.CANCEL)
cancel_tx = merge(cancel_tx, {
'from' : user1.address,
'nonce' : value_transfer_tx['nonce']
})
cancel_tx = fill_transaction(cancel_tx, w3)
# sign the kaia specific transaction type with web3py
signed_tx = Account.sign_transaction(cancel_tx, user1.key)
print("\nraw transaction of signed tx:", signed_tx.rawTransaction.hex())
recovered_tx = Account.recover_transaction(signed_tx.rawTransaction)
print("\nrecovered sender address", recovered_tx)
decoded_tx = Account.decode_transaction(signed_tx.rawTransaction)
print("\ndecoded transaction:", to_pretty(decoded_tx))
tx_hash = w3.eth.send_raw_transaction(signed_tx.rawTransaction)
tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
print('tx hash: ', tx_hash, 'receipt: ', tx_receipt)
web3_cancel_sign_recover()

output

❯ py cancel_example.py
raw transaction of signed tx: 0x38f86b82036f850ba43b740083026d1894a2a8854b1802d8cd5de631e690817c253d6a9153f847f8458207f5a0a559852e977476bfa6ba263a9c1f1f4b60608b82752d73a3f1162e341e7b5f06a07f12a242ad1cdbc08966e62af4c8749fc438e058b1344a4f11ba206f207ddc84
recovered sender address 0xA2a8854b1802D8Cd5De631E690817c253d6a9153
decoded transaction: {
"type": 56,
"nonce": 879,
"gasPrice": 50000000000,
"gas": 159000,
"from": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",
"signatures": [
{
"v": 2037,
"r": 74789788593375966616662801192824717129914792416281096168085546212656613646086,
"s": 57476654897736400463186412232435765147976539862827431359170424955204316028036
}
],
"chainId": 1001
}
tx hash: 0x3b1278d3748b638a41ffc40ed4cffc6c789ceffbd924f9b00ae7b53f26815686 receipt: AttributeDict({'blockHash': HexBytes('0x672deecd07b84c2b524f160fccc6ce0d20486bdde914a7c7065e2de0ed723635'), 'blockNumber': 147364137, 'contractAddress': None, 'cumulativeGasUsed': 349674, 'effectiveGasPrice': 25000000000, 'from': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'gasUsed': 21000, 'logs': [], 'logsBloom': HexBytes('0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'), 'status': 1, 'to': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'transactionHash': HexBytes('0x3b1278d3748b638a41ffc40ed4cffc6c789ceffbd924f9b00ae7b53f26815686'), 'transactionIndex': 3, 'type': 0})

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