hardhat/dist/src/internal/builtin-plugins/network-manager/request-handlers/handlers/accounts/automatic-sender-handler.js

Hardhat is an extensible developer tool that helps smart contract developers increase productivity by reliably bringing together the tools they want.

import { assertHardhatInvariant } from "@nomicfoundation/hardhat-errors";
import { SenderHandler } from "./sender.js";
/**
 * This class automatically retrieves and caches the first available account from the connected provider.
 * It overrides the getSender method of the base class to request the list of accounts if the first account has not been fetched yet,
 * ensuring dynamic selection of the sender for all JSON-RPC requests without requiring manual input.
 */
export class AutomaticSenderHandler extends SenderHandler {
    #alreadyFetchedAccounts = false;
    #firstAccount;
    async getSender() {
        if (this.#alreadyFetchedAccounts === false) {
            const accounts = await this.provider.request({
                method: "eth_accounts",
            });
            // TODO: This shouldn't be an exception but a failed JSON response!
            assertHardhatInvariant(Array.isArray(accounts), "eth_accounts response should be an array");
            this.#firstAccount = accounts[0];
            this.#alreadyFetchedAccounts = true;
        }
        return this.#firstAccount;
    }
}
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