hardhat
Version:
Hardhat is an extensible developer tool that helps smart contract developers increase productivity by reliably bringing together the tools they want.
44 lines • 1.72 kB
JavaScript
import { assertHardhatInvariant } from "@nomicfoundation/hardhat-errors";
import { hexStringToNumber, isPrefixedHexString, } from "@nomicfoundation/hardhat-utils/hex";
/**
* This class is responsible for retrieving the chain ID of the network.
* It uses the provider to fetch the chain ID via two methods: 'eth_chainId' and,
* as a fallback, 'net_version' if the first one fails. The chain ID is cached
* after being retrieved to avoid redundant requests.
*/
export class ChainId {
provider;
#chainId;
constructor(provider) {
this.provider = provider;
}
async getChainId() {
if (this.#chainId === undefined) {
try {
this.#chainId = await this.#getChainIdFromEthChainId();
}
catch {
// If eth_chainId fails we default to net_version
this.#chainId = await this.#getChainIdFromEthNetVersion();
}
}
return this.#chainId;
}
async #getChainIdFromEthChainId() {
const id = await this.provider.request({
method: "eth_chainId",
});
assertHardhatInvariant(typeof id === "string", "id should be a string");
return hexStringToNumber(id);
}
async #getChainIdFromEthNetVersion() {
const id = await this.provider.request({
method: "net_version",
});
assertHardhatInvariant(typeof id === "string", "id should be a string");
// There's a node returning this as decimal instead of QUANTITY.
// TODO: from V2 - Document here which node does that
return isPrefixedHexString(id) ? hexStringToNumber(id) : parseInt(id, 10);
}
}
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