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取消

TxTypeCancel 取消事務池中具有相同 nonce 的事務的執行。 當已提交的交易在一定時間內似乎未得到處理時，這種交易類型就很有用。

Import extend from web3py_ext to extend web3 to kaia web3

Import necessary utils from eth_account, web3py_ext and cytoolz

使用指定的 kairos 測試網 URL 創建 Web3 實例

此外，您還可以將提供商 URL 從 kairos 更改為 quicknode

從私人密鑰加載賬戶

用私人密鑰加載一個付款人賬戶，代替上述賬戶簽署和發送交易

創建一個TxType.FEE_DELEGATED_CANCEL類型的空交易。 您可以使用 empty_tx 工具來獲取已填寫默認字段的 tx。

使用 merge 工具將 from 和 nonce 字段合併到空 tx 中。

使用 fill_transaction 為交易對象添加更多參數，如氣體限制...

用用戶的私鑰簽署取消 tx

從已簽署的 tx 中的簽名中恢復signer's address

您可以使用Account.decode_transaction工具對 RLP 編碼的 tx 進行解碼，如果您想讓輸出格式更漂亮，請使用to_pretty工具。

用收費委託人的賬戶簽署原始交易

從簽署的交易中找回繳費人地址

您可以使用Account.decode_transaction工具對 RLP 編碼的 tx 進行解碼，如果您想讓輸出格式更漂亮，請使用to_pretty工具。

web3_fee_delegated_cancel_sign_recover.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,

TX_TYPE_FEE_DELEGATED_CANCEL

)

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_fee_delegated_cancel_sign_recover():

user = Account.from_key('0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8')

fee_delegator = Account.from_key('0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4')

cancel_tx = empty_tx(TX_TYPE_FEE_DELEGATED_CANCEL)

cancel_tx = merge(cancel_tx, {

'from' : user.address,

})

cancel_tx = fill_transaction(cancel_tx, w3)

# sign the kaia specific transaction type with web3py

signed_tx = Account.sign_transaction(cancel_tx, user.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))

feepayer_signed_tx = Account.sign_transaction_as_feepayer(signed_tx.rawTransaction, fee_delegator.address, fee_delegator.key)

print("\nraw transaction of feePayer signed tx:", feepayer_signed_tx.rawTransaction.hex())

feepayer_recovered_tx = Account.recover_transaction_as_feepayer(feepayer_signed_tx.rawTransaction)

print("recovered feepayer address:", feepayer_recovered_tx)

decoded_tx = Account.decode_transaction(feepayer_signed_tx.rawTransaction)

print("\ndecoded transaction:", to_pretty(decoded_tx))

web3_fee_delegated_cancel_sign_recover()

output

❯ py web3_fee_delegated_cancel_sign_recover.py

# raw transaction of signed tx: 0x39f86b8203a3850ba43b740083026d1894a2a8854b1802d8cd5de631e690817c253d6a9153f847f8458207f5a00eec532ebe17fade46561d3ff503c97e07d8d9ba611b6a7f8a1cc11621dfc03fa006e3ee9cf4f5bfd6674d656c571cfb80b0bfd99bebe87f017e288be7ea4fec21

# recovered sender address 0xA2a8854b1802D8Cd5De631E690817c253d6a9153

# decoded transaction: {

# "type": 57,

# "nonce": 931,

# "gasPrice": 50000000000,

# "gas": 159000,

# "from": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",

# "signatures": [

# {

# "v": 2037,

# "r": 6749929892576958642714739615979538685230067780127794094925331144130783330367,

# "s": 3116598222383802394999638931088885558560578183897443089888519072063383661601

# }

# ],

# "chainId": 1001

# }

# raw transaction of feePayer signed tx: 0x39f8c98203a3850ba43b740083026d1894a2a8854b1802d8cd5de631e690817c253d6a9153f847f8458207f5a00eec532ebe17fade46561d3ff503c97e07d8d9ba611b6a7f8a1cc11621dfc03fa006e3ee9cf4f5bfd6674d656c571cfb80b0bfd99bebe87f017e288be7ea4fec2194cb0eb737dfda52756495a5e08a9b37aab3b271daf847f8458207f6a06697d97df68a0c4a2c59b3d7a8c5c479a6b43e7a34394518b858ef908d10b76aa0492c8da32c77a71ce26650f9ac842496bb33f0f17877ce1b23e1763b7c87e28d

# recovered feepayer address: ['0xCb0eb737dfda52756495A5e08A9b37AAB3b271dA']

# decoded transaction: {

# "type": 57,

# "nonce": 931,

# "gasPrice": 50000000000,

# "gas": 159000,

# "from": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",

# "feePayer": "0xCb0eb737dfda52756495A5e08A9b37AAB3b271dA",

# "signatures": [

# {

# "v": 2037,

# "r": 6749929892576958642714739615979538685230067780127794094925331144130783330367,

# "s": 3116598222383802394999638931088885558560578183897443089888519072063383661601

# }

# ],

# "feePayerSignatures": [

# {

# "v": 2038,

# "r": 46404205537188908000560167654303187399733564148219565625489961916532872230762,

# "s": 33097556762817862610763009383178378013466927896867683158585566455859245474445

# }

# ],

# "chainId": 1001

# }