Send a Transaction Using send_raw_transaction
Contents
Send a Transaction Using send_raw_transaction¶
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This example shows how to sign a transaction without using w3.wallet and how to send a transaction using send_raw_transaction. This method is more flexible but simultaneously more complex to use. Refer to quickstart if you only want to get acquiantance to how to send a transaction.
import pprint
from conflux_web3 import Web3
from conflux_web3.utils import fill_transaction_defaults
w3 = Web3(Web3.HTTPProvider("https://test.confluxrpc.com"))
account = w3.account.from_key("0x....") # replace your secret key with "0x...."
Manully Send a Transaction¶
Basiclly, we follow the workflow of 4 steps to send a transaction:
build transaction
sign transaction
send transaction to the blockchain node(s)
wait for transaction execution result
If an account is added to the w3.wallet, SDK will help to finish the first 3 steps in a row,
otherwise you will need to do the first 3 steps manually.
Build a Simple Transaction¶
Only necessary parameters are provided here, and other params are filled by fill_transaction_defaults.
Refer to construct_transaction_from_scratch to see how to manually fill each field of a transaction.
built_trivial_tx = fill_transaction_defaults(w3, {
'from': account.address,
'to': w3.account.create().address,
'value': 100,
})
Sign a Transaction¶
signed_tx = account.sign_transaction(built_trivial_tx)
Send the Transaction¶
h = w3.cfx.send_raw_transaction(signed_tx.rawTransaction)
Wait for Transaction Execution¶
tx_receipt = h.executed()
Interact with a Contract¶
# if you want to get contract object from metadata file, use
# >>> erc20_metadata = json.load(open("path/to/ERC20metadata.json"))
# >>> erc20 = web3.cfx.contract(bytecode=erc20_metadata["bytecode"], abi=erc20_metadata["abi"])
erc20 = w3.cfx.contract(name="ERC20")
# build a transaction
# parameters such as 'from'/'gasPrice'/... can be specified in `build_transaction`
built_constuct_tx = erc20.constructor(name="Coin", symbol="C", initialSupply=10**18).build_transaction({
'from': account.address,
})
# sign the transaction
construct_tx = account.sign_transaction(built_constuct_tx)
# send & wait for execution result
contract_address = w3.cfx.send_raw_transaction(construct_tx.rawTransaction).executed()['contractCreated']
print(f"deployed contract address: {contract_address}")
deployed contract address: cfxtest:acfgtrw53v4ju9jaydmr9yyf9xyvfxpe0e8ny2fd4d
# interact with the deployed contract
contract = w3.cfx.contract(address=contract_address, name="ERC20")
# build a transaction
# parameters such as 'from'/'gasPrice'/... can be specified in `build_transaction`
built_transfer_tx = contract.functions.transfer(
w3.account.create().address,
100
).build_transaction({
'from': account.address
})
# sign the transaction
signed_transfer_tx = account.sign_transaction(
built_transfer_tx
)
# send & wait for execution result
print("erc20 transfer receipt: ")
pprint.pprint(
dict(w3.cfx.send_raw_transaction(signed_transfer_tx.rawTransaction).executed())
)
erc20 transfer receipt:
{'blockHash': HexBytes('0x9b8a0a0e5eb33d67b2c85d4e951b0251e1b972cd00f7c18c53ecacb7fd7edfd3'),
'contractCreated': None,
'epochNumber': 99051304,
'from': 'cfxtest:aanhtnrex2nj56kkbws4yx0jeab34ae16pcap53w13',
'gasCoveredBySponsor': False,
'gasFee': 37063000000000 Drip,
'gasUsed': 37063,
'index': 0,
'logs': [AttributeDict({'address': 'cfxtest:acfgtrw53v4ju9jaydmr9yyf9xyvfxpe0e8ny2fd4d', 'topics': [HexBytes('0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef'), HexBytes('0x0000000000000000000000001677ada49e168df1290c9daa4ec820039d0097e3'), HexBytes('0x0000000000000000000000001ab7c2bb12a3484451a55ed15285a4cf10196312')], 'data': HexBytes('0x0000000000000000000000000000000000000000000000000000000000000064')})],
'logsBloom': HexBytes('0x00000020000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000200008000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000040000200000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000200000000400000000000000000000020000000000000000'),
'outcomeStatus': 0,
'stateRoot': HexBytes('0xa14515ac4ad59a0ab8b7c4c1740eb5a97d0b55eabf3b5a0b185867e41d1a1699'),
'storageCollateralized': 64,
'storageCoveredBySponsor': False,
'storageReleased': [],
'to': 'cfxtest:acfgtrw53v4ju9jaydmr9yyf9xyvfxpe0e8ny2fd4d',
'transactionHash': HexBytes('0x224e75f10580194685cd2566bd7ec5fdefd09578fe770bddae2ba9f77842f11a'),
'txExecErrorMsg': None}