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

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

import { HardhatError } from "@nomicfoundation/hardhat-errors";
import { isObject } from "@nomicfoundation/hardhat-utils/lang";
import { getRequestParams } from "../../../json-rpc.js";
/**
 * This class modifies JSON-RPC requests.
 * It checks if the request is related to transactions and ensures that the "from" field is populated with a sender account if it's missing.
 * If no account is available for sending transactions, it throws an error.
 * The class also provides a mechanism to retrieve the sender account, which must be implemented by subclasses.
 */
export class SenderHandler {
    #methods = new Set([
        "eth_sendTransaction",
        "eth_call",
        "eth_estimateGas",
    ]);
    provider;
    constructor(provider) {
        this.provider = provider;
    }
    isSupportedMethod(jsonRpcRequest) {
        return this.#methods.has(jsonRpcRequest.method);
    }
    async handle(jsonRpcRequest) {
        if (!this.isSupportedMethod(jsonRpcRequest)) {
            return jsonRpcRequest;
        }
        const method = jsonRpcRequest.method;
        const params = getRequestParams(jsonRpcRequest);
        const [tx] = params;
        if (isObject(tx) && tx.from === undefined) {
            const senderAccount = await this.getSender();
            if (senderAccount !== undefined) {
                tx.from = senderAccount;
            }
            else if (method === "eth_sendTransaction") {
                throw new HardhatError(HardhatError.ERRORS.CORE.NETWORK.NO_REMOTE_ACCOUNT_AVAILABLE);
            }
        }
        return jsonRpcRequest;
    }
}
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