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智能合约执行

TxTypeSmartContractExecution 使用给定数据执行智能合约。只有当 "to "是智能合约账户时，才接受TxTypeSmartContractExecution。

从web3py_ext导入extend，将 web3 扩展为 kaia web3

从 eth_account、web3py_ext 和 cytoolz 中导入必要的实用程序

使用指定的 kairos 测试网 URL 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

从私人密钥加载缴费人账户

创建一个TxType.FEE_DELEGATED_SMART_CONTRACT_EXECUTION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 工具将附加字段（如from、to和data）合并到空 tx 中。

在至字段中设置要执行的**合同地址

在本教程中，调用合约函数的数据被编码为字节流。请参阅智能合约部分的编写教程，以制作编码数据

使用 fill_transaction 为交易对象添加更多参数，如气体限制...

用用户的私人密钥签署值传输 tx

从已签署的 tx 中的签名中恢复签名人地址

用缴费人的私人密钥签署价值转移 tx

从已签署的 tx 中的签名中恢复缴费人地址

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。

将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。

delegated_smart_contract_execution_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,
    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_fee_delegated_smart_contract_execution_sign_recover():
    user = Account.from_key('0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8')
    fee_delegator = Account.from_key('0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4')
    smart_contract_execution_tx = empty_tx(TxType.FEE_DELEGATED_SMART_CONTRACT_EXECUTION)
    smart_contract_execution_tx = merge(smart_contract_execution_tx, {
        'from' : user.address,
        'to' : '0x108bF12b50c9ef65525F0495C721aEc55015e111', # already deployed contract for test before
        'data' : '0x3d7403a30000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000c48656c6c6f204b6c6179746e0000000000000000000000000000000000000000',
    })
    smart_contract_execution_tx = fill_transaction(smart_contract_execution_tx, w3)
    # sign the kaia specific transaction type with web3py
    signed_tx = Account.sign_transaction(smart_contract_execution_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)
    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))
    tx_hash = w3.eth.send_raw_transaction(feepayer_signed_tx.rawTransaction)
    tx_receipt = w3.eth.wait_for_transaction_receipt(tx_hash)
    print('tx hash: ', tx_hash, 'receipt: ', tx_receipt)
web3_fee_delegated_smart_contract_execution_sign_recover()

output


❯ py delegated_smart_contract_execution_sign_recover.py
raw transaction of signed tx: 0x31f8e78203a3850ba43b74008301b05d94108bf12b50c9ef65525f0495c721aec55015e1118094a2a8854b1802d8cd5de631e690817c253d6a9153b8643d7403a30000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000c48656c6c6f204b6c6179746e0000000000000000000000000000000000000000f847f8458207f5a00a3db2a6793df0b256e2a81bce7ae3780783fcf58cc8326a14371c3413f3075da05031fd033453cf9a7be888b1db3812193d00221e299b483aa4e80a850664618a
recovered sender address 0xA2a8854b1802D8Cd5De631E690817c253d6a9153
raw transaction of feePayer signed tx: 0x31f901458203a3850ba43b74008301b05d94108bf12b50c9ef65525f0495c721aec55015e1118094a2a8854b1802d8cd5de631e690817c253d6a9153b8643d7403a30000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000c48656c6c6f204b6c6179746e0000000000000000000000000000000000000000f847f8458207f5a00a3db2a6793df0b256e2a81bce7ae3780783fcf58cc8326a14371c3413f3075da05031fd033453cf9a7be888b1db3812193d00221e299b483aa4e80a850664618a94cb0eb737dfda52756495a5e08a9b37aab3b271daf847f8458207f5a08275e838e70da6b1c590f6a8ee5a545ddf93963c5d62bc423835930b91295aa0a06bcd34e8a2a9114c15311e2d7b3004c041410cecb3452349a6e82e09b736b41c
recovered feepayer address: ['0xCb0eb737dfda52756495A5e08A9b37AAB3b271dA']
decoded transaction: {
  "type": 49,
  "value": 0,
  "gasPrice": 50000000000,
  "nonce": 931,
  "gas": 110685,
  "to": "0x108bF12b50c9ef65525F0495C721aEc55015e111",
  "from": "0xA2a8854b1802D8Cd5De631E690817c253d6a9153",
  "data": "0x3d7403a30000000000000000000000000000000000000000000000000000000000000020000000000000000000000000000000000000000000000000000000000000000c48656c6c6f204b6c6179746e0000000000000000000000000000000000000000",
  "feePayer": "0xCb0eb737dfda52756495A5e08A9b37AAB3b271dA",
  "signatures": [
    {
      "v": 2037,
      "r": 4632139155753288816177914350449378738873058722929189649296670464490515662685,
      "s": 36273349621051746908322095917532842606006460166655513683041721600219371823498
    }
  ],
  "feePayerSignatures": [
    {
      "v": 2037,
      "r": 59008994161645925359182568890805662549212009998969311671295364669364719147680,
      "s": 48760043609336873845154832650749116609475268552379125539006421213296675173404
    }
  ],
  "chainId": 1001
}
tx hash:  0x3569f46bb885eb4c849e10009ec7096530fa44ef7ee1287df83820fcef8d0ebd receipt:  AttributeDict({'blockHash': HexBytes('0x83d5276dc3fec557740a2d25c8f076aba11c022e7021b71bd95a76318c4ff5c9'), 'blockNumber': 148225895, 'contractAddress': None, 'cumulativeGasUsed': 44742, 'effectiveGasPrice': 25000000000, 'from': '0xA2a8854b1802D8Cd5De631E690817c253d6a9153', 'gasUsed': 44742, 'logs': [], 'logsBloom': HexBytes('0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000'), 'status': 1, 'to': '0x108bF12b50c9ef65525F0495C721aEc55015e111', 'transactionHash': HexBytes('0x3569f46bb885eb4c849e10009ec7096530fa44ef7ee1287df83820fcef8d0ebd'), 'transactionIndex': 0, 'type': 0})