Ethereum: Ethersjs: check that a transaction method in contract emitted an event
Ethereum: Ethers.js – Checking Transaction Methods EMIT EVENTS
Introduction
In this article, In
The getowownerdress function
The getowheradress function is called when the owner address changes within the contract:
`Solidity
Function GetTowneraddress () Public View Returns (Address) {
Emit ownerreturned ("owner");
}
. This means that every time
Verifying Event Emission
To verify that the getowowneraddress function emits the correct events, we can use ethers.js. Here’s an updated version of the Contract with Some Additional Checks:
`Solidity
Pragma Solidity ^0.8.0;
import "
Import "
MyContract Contract {
Address Private Owneraddress;
uint256 public balance = 0;
Event ownerreturned (String Memory Msg);
Function GetTowneraddress () Public View Returns (Address) {
Require (msg.nerder == owneraddress, "only contract owner can call this function");
Emit ownerreturned ("owner");
Return Address (0); // Return null to indicate that no new owner has been set
}
Function Setowner (Address _newowner) Public {
Require (_Newowner! = Owneraddress &&! Balance, "Cannot Change Owner or Transfer Tokens");
ownerdress = _newowner;
Emit ownerreturned ("owner");
balance = 0;
}
}
Explanation
In this updated contract:
1.
2.
3.
Conclusion
Verifying that a transaction method emits events is crucial to ensure contract security and integrity. By using your contracts in production. This example demonstrates how to write more robust smart contracts by verifying event emissions and handling edge cases correctly.