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import * as Web3 from 'web3';
import { Subprovider } from './subprovider';
/*
* This class implements the web3-provider-engine subprovider interface and returns
* the constant gas estimate when queried.
* HACK: We need this so that our tests don't use testrpc gas estimation which sometimes kills the node.
* Source: https://github.com/trufflesuite/ganache-cli/issues/417
* Source: https://github.com/trufflesuite/ganache-cli/issues/437
* Source: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
*/
export class FakeGasEstimateSubprovider extends Subprovider {
private _constantGasAmount: number;
constructor(constantGasAmount: number) {
super();
this._constantGasAmount = constantGasAmount;
}
// This method needs to be here to satisfy the interface but linter wants it to be static.
// tslint:disable-next-line:prefer-function-over-method
public handleRequest(
payload: Web3.JSONRPCRequestPayload,
next: () => void,
end: (err: Error | null, result: any) => void,
) {
switch (payload.method) {
case 'eth_estimateGas':
end(null, this._constantGasAmount);
return;
default:
next();
return;
}
}
}
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