Reading data from several contracts with Wagmi and React
As a developer, you probably know the Wagmi library, which provides an easy -to -use API to interact with several blockchain contracts using web3.js and ethers.js. In this article, we will explore how to use the Wagmi hook of Wagmi to recover data from several Ethereum contracts at the same time.
the problem
Suppose you have a list of 5 contracts with the same ABI (binary application interface), but that each contract has its own implementation. You wish to recover all the data necessary from these contracts using Wagmi, but currently, “UseradContracts” only returns information on a contract at a time.
The solution
To solve this problem, we will use the hook UsegtContractinstance 'de Wagmi and create an instances table for each contract. Then we will pass this table to "UseradContracts" to recover data from all contracts simultaneously.
Here is an example of code to get started:
Javascript
Import {Ethers} de 'Ethers';
Import {UseradContracts} of '@ WAGMI / WAGMI';
Const ABI = [...]; // Your Abi contract
// create a range of instances for each contract
ConstressesniStances = [
{
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 USEGETCTRActinstance to obtain a table of contractual instances
constructs = await useradcontracts (contractinstances);
// You can now recover the data from all the contracts using a Wagmi UsegetContractdata Crochet
ASYNC FETCHDATA () {
Const Data = [];
for (constation contract) {
to try {
Const result = wait USEGETCTRACTDATA (contract.address, abi);
Data.push (... Result.Data);
} Catch (error) {
Console.error (error);
}
}
turn over the data;
}
// Use the Fetchdata function each time you need to recover data from several contracts
Setinterval (Fetchdata, 1000); // look every second
'
Tips and variations
- You can transmit an object with contractual addresses in the form of key values pairs forUseradContracts”.
`Javascript
ConstressesniStances = [
{
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 recover data from parallel contracts, you can use the WAGMI USEGMI hook with an object where the key is the address of the contract and the value is a function that returns the data for each CONTRACT.
Javascript
ConstressesniStances = [
{
ID: 1,
Address: '0x ...',
Instance: Ethers.contractabi.fromwei (Abi, Ethers.utils.hextowei ('...')) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,)
},
{
ID: 2,
Address: '0x ...',
Instance: Ethers.contractabi.fromwei (Abi, Ethers.utils.hextowei ('...')) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,) ,,)
},
]]
Const Data = {};
for (constation contract) {
Data [Contract.address] = Wait UsegetContractdata (Contract.address, Abi);
}
` ‘
I hope it helps! Let me know if you have any questions or if you need additional help.
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