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import { JSONRPCRequestPayload } from '@0xproject/types';
import { Callback, ErrorCallback } from '../types';
import { Subprovider } from './subprovider';
// 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
/**
* This class implements the [web3-provider-engine](https://github.com/MetaMask/provider-engine) subprovider interface.
* It intercepts the `eth_estimateGas` JSON RPC call and always returns a constant gas amount when queried.
*/
export class FakeGasEstimateSubprovider extends Subprovider {
private _constantGasAmount: number;
/**
* Instantiates an instance of the FakeGasEstimateSubprovider
* @param constantGasAmount The constant gas amount you want returned
*/
constructor(constantGasAmount: number) {
super();
this._constantGasAmount = constantGasAmount;
}
/**
* This method conforms to the web3-provider-engine interface.
* It is called internally by the ProviderEngine when it is this subproviders
* turn to handle a JSON RPC request.
* @param payload JSON RPC payload
* @param next Callback to call if this subprovider decides not to handle the request
* @param end Callback to call if subprovider handled the request and wants to pass back the request.
*/
// tslint:disable-next-line:prefer-function-over-method async-suffix
public async handleRequest(payload: JSONRPCRequestPayload, next: Callback, end: ErrorCallback): Promise<void> {
switch (payload.method) {
case 'eth_estimateGas':
end(null, this._constantGasAmount);
return;
default:
next();
return;
}
}
}
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