Reading Data from Multiple Contracts with Wagmi and React
As a developer, you’re likely familiar with the wagmi library, which provides an easy-to-use api for interacting with multiple blockchain contracts using web3.js and ethers.js. In this article, we’ll explore how to use wagmi’s useread contracts hook to fetch data from multiple ethereum contracts at once.
The Problem
Let’s say you have a list of 5 contracts with the same abi (Application Binary interface), but each contract has its own implementation. You want to fetch all the necessary data from these contracts using wagmi, but current, useread contracts only returns the information about one contract at a time.
The Solution
To Solve This Problem, We’ll use wagmi’s USEGETCONTANCE hook and create an array of instances for Each contract. Then, we’ll pass this array to useread contracts to fetch data from all contracts simultaneously.
Here’s some sample code to get you started:
`Javascript
import {ethers} From ‘Ethers’;
import {useread contracts} from ‘@wagmi/wagmi’;
Const abi = […]; // Your contract ABI
// Create An Array of Instances for Each Contract
Contract Instances = [[
{
ID: 1,
Address: ‘0x …’,
instance: ethers. contractabi.fromwei (abi, ethers.utils.hextowei (‘…’)) (),,,
},
{
ID: 2,
Address: ‘0x …’,
instance: ethers. contractabi.fromwei (abi, ethers.utils.hextowei (‘…’)) (),,,
},
// …
];
// Use UseGet contract instance to get an array or contract instances
Conste contracts = Await useread contracts (contract instances);
// now you can fetch data from all contracts simultaneously using wagmi’s use contract data hook
async function fetchdata () {
Const Data = [];
for (conste contract or contract) {
Try {
Const results = Await Useget contract data (contract.address, ABI);
Data.push (… result.data);
} Catch (Error) {
console.error (error);
}
}
Return data;
}
// use the fetchdata function when you need to fetch data from multiple contracts
set interval (fetchdata, 1000); // Fetch Every Second
`
Tips and variations
- You can pass an object with contract addresses as key-value pairs for
useread contracts.
`Javascript
Contract Instances = [[
{
ID: 1,
Address: ‘0x …’,
instance: ethers. contractabi.fromwei (abi, ethers.utils.hextowei (‘…’)) (),,,
},
{
ID: 2,
Address: ‘0x …’,
instance: ethers. contractabi.fromwei (abi, ethers.utils.hextowei (‘…’)) (),,,
},
];
`
- If you need to fetch data from contracts in parallel, you can use wagmi’s
Usegeget contract datahook with an object where the key is the contract address and the value is a function that returns data for each contract.
`Javascript
Contract Instances = [[
{
ID: 1,
Address: ‘0x …’,
instance: ethers. contractabi.fromwei (abi, ethers.utils.hextowei (‘…’)) (),,,
},
{
ID: 2,
Address: ‘0x …’,
instance: ethers. contractabi.fromwei (abi, ethers.utils.hextowei (‘…’)) (),,,
},
];
Con dates = {};
for (conste contract or contract) {
Data [contract.address] = Await UseGet contract data (contract.address, ABI);
}
`
I hope this helps! Let me know if you have any questions or need further assistance.
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