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import promisify = require('es6-promisify');
import Web3 = require('web3');
import { JSONRPCPayload } from '../types';
/*
* A version of the base class Subprovider found in providerEngine
* This one has an async/await `emitPayloadAsync` and also defined types.
* Altered version of: https://github.com/MetaMask/provider-engine/blob/master/subproviders/subprovider.js
*/
export class Subprovider {
private _engine: any;
// Ported from: https://github.com/MetaMask/provider-engine/blob/master/util/random-id.js
private static _getRandomId() {
const extraDigits = 3;
// 13 time digits
const datePart = new Date().getTime() * Math.pow(10, extraDigits);
// 3 random digits
const extraPart = Math.floor(Math.random() * Math.pow(10, extraDigits));
// 16 digits
return datePart + extraPart;
}
private static _createFinalPayload(payload: JSONRPCPayload): Web3.JSONRPCRequestPayload {
const finalPayload = {
// defaults
id: Subprovider._getRandomId(),
jsonrpc: '2.0',
params: [],
...payload,
};
return finalPayload;
}
public setEngine(engine: any): void {
this._engine = engine;
}
public async emitPayloadAsync(payload: JSONRPCPayload): Promise<any> {
const finalPayload = Subprovider._createFinalPayload(payload);
const response = await promisify(this._engine.sendAsync, this._engine)(finalPayload);
return response;
}
}
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