Ethereum: Combine token approval and contract invocation in a single call
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Connect the token confirmation and call the contract Ethers.js
When communicating with decentralized programs (DAPP) designed on Ethereum, one common model is to move chips to an intellectual contract. However, this can lead to unnecessary total costs and potential threats due to safety due to two separate relationships: approval of the access key and call for the contract.
As part of the implementation, we establish two separate relationships:
- “I wait for the token. Confirmation (contractual, amount);
- “Wait for the contract. MyFUNCTION () – Causes the contract function using approved chips.
This approach can be complicated and sensitive to mistakes, as it requires manually managing the approval process and ensuring that it only causes specific functions under the contract.
A single connection introduction: Access Key Confirmation and Contract Calling Ethers.js
To simplify this process and reduce the unnecessary cost, we will introduce a new method called “Confirmation”. This feature will connect the token confirmation with a call in one connection.
`JavaScript
Import {ether} with "ether";
/**
* Connect the access key approval and call the contract in one connection.
*
* @Pamam {string} tokenaddress - the key to approval access.
* @param {String} ContractDress - an intellectual contract address that can be activated.
* @param {number} - sum of tokens to confirm the contract.
*/
Async feature confirmed (tokenaddress, ContractDress, sum) {
// Get a provider copy
CONST provider = wait for ether.getProvider ();
// Confirm the sign of a particular contract
CONST CORCEPENSE = Wait for the supplier will confirm (tokenaddress, contract, amount);
IF (! Campvereponse), throw away a new error ("failed to confirm the token");
// Call the contract function using approved chips
try {
They waited for the supplier.ino -Germany ("contractdds", "Myfunction", {tokens: [amount]});
} catch (error) {
console.error (error); // Confirmation and Calling Failing Failed
}
}
Export the default approval;
Example Usage
`JavaScript
Import {provenke} z "
// Change the address of the sign, the address of the contract and the amount
CONST tokenaddress = '0x ...'; // Change the token to the true address
CONSTADDDRESS = '0x ...'; // Change the actual contract address
CONST is = 10N;
Confirmation (tokenaddress, ContractdDress, sum) .then (() => {
Console.log ("tokens confirmed and successfully appointed!");
}). catch ((error) => {
console.error (error); // Confirmation and Calling Failing Failed
});
This feature “confirms that the required parameters to approve specific signs in a particular contract and cause the contract function using approved chips. This approach reduces the costs of manual access and contract call, making it a more convenient and safer way to communicate with Ethereum DAPP.