Ethereum: gasLimit argument in ethers.js confuses me
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Understanding gasLimit in Ethers.js
The gasLimit argument is a crucial component of Ethereum transactions. It specifies the maximum amount of computing power that can be used to execute the transaction. In this article, we will break down the concepts involved and explore how to use gasLimit effectively.
What is a gas limit?
Gas limit refers to the total amount of computing resources (e.g., CPU cycles, GPU time) allocated to a particular transaction on the Ethereum network. It is measured in gas units, which are the smallest unit of computation that can be executed by the Ethereum Virtual Machine (EVM). A higher gas limit allows the transaction to execute faster, but consumes more resources.
gasLimit argument
When calling an ether.js contract using contract.callMain, the gasLimit argument is optional. If not provided, it defaults to 20,000 gas units, which can be adjusted later.
const realCall = await contract.callMain(secondAddress, num, { gasLimit: 5000 });
Problem with the provided gas limit
In your example, you provided a “gasLimit” argument of 50,000. However, this can cause problems if the transaction is executed on a test network node or in a production environment where gas prices are lower.
const realCall = await contract.callMain(secondAddress, num, { gas: 50000 });
How to Use gasLimit Effectively
To avoid potential issues related to low gas prices or long transaction execution times, consider the following best practices:
- Use a higher gas limit: If your transaction requires more computing resources, specify a higher gas limit. However, keep in mind that this may increase the risk of the transaction being canceled due to excessive gas consumption.
- Choose a contract with sufficient gas limit: Select a contract optimized for high gas limit transactions.
- Monitor gas prices: Monitor gas price fluctuations and adjust the `
Gas Limitaccordingly.
Example use case: optimizing the gas limit
Let's say you have a transaction that requires 100,000 units of gas to execute. You want to optimize the gas limit to reduce the risk of transaction cancellation due to excessive gas consumption.
const realCall = wait contract.callMain(secondAddress, num, { gasLimit: 15000 });
Conclusion
The gas limit is a critical aspect of Ethereum transactions that can impact performance and security. By understanding how gasLimit works and using it effectively, you can write more efficient and robust Ethers.js contracts.
Code Sample
import ethers from
ethers'';// Simulates the execution of a transaction
async function main() {
const contract = new ethers.Contract(secondAddress, num);
// Specify the gas limit (optional)
const gasLimit = { gas: 50000 }; // Default 20,000 gas units
const realCall = await contract.callMain(num, gasLimit);
}
hand();
Note that in this example I omitted the gasLimit` argument for brevity. In a real-world scenario, you would specify the desired gas limit when calling the contract.
Commitment message guidelines
When making changes, use the standard rules for commit messages:
feat: Add gas limit optimization
- Introduce the concept of gas limit in Ethers.js contracts
- Provide an example use case for gas limit optimization
By following these guidelines and best practices, you can ensure that your Ethers.js code is well-structured, maintainable, and efficient.
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