add binance

package.json

@@ -1,6 +1,6 @@
 {
   "name": "gas-price-oracle",
-  "version": "0.2.2",
+  "version": "0.2.3",
   "description": "Gas Price Oracle library for Ethereum dApps.",
   "main": "lib/index.js",
   "homepage": "https://github.com/peppersec/gas-price-oracle",

src/config/binance.ts

@@ -0,0 +1,23 @@
+import { OffChainOracle, OffChainOracles, OnChainOracles } from '../types';
+
+const bscgas: OffChainOracle = {
+  name: 'bscgas',
+  url: 'https://bscgas.info/gas',
+  instantPropertyName: 'imediate',
+  fastPropertyName: 'fast',
+  standardPropertyName: 'standard',
+  lowPropertyName: 'slow',
+  denominator: 1,
+  additionalDataProperty: null,
+};
+
+export const offChainOracles: OffChainOracles = {
+  bscgas,
+};
+
+export const onChainOracles: OnChainOracles = {};
+
+export default {
+  offChainOracles,
+  onChainOracles,
+};

src/config/index.ts

@@ -0,0 +1,25 @@
+import { NetworkConfig } from '../types';
+import {
+  onChainOracles as mainnetOnchainOracles,
+  offChainOracles as mainnetOffChainOracles,
+} from './mainnet';
+import {
+  onChainOracles as binanceOnchainOracles,
+  offChainOracles as binanceOffchainOracles,
+} from './binance';
+
+export enum ChainId {
+  MAINNET = 1,
+  BINANCE = 56,
+}
+
+export const networks: NetworkConfig = {
+  [ChainId.MAINNET]: {
+    onChainOracles: mainnetOnchainOracles,
+    offChainOracles: mainnetOffChainOracles,
+  },
+  [ChainId.BINANCE]: {
+    onChainOracles: binanceOnchainOracles,
+    offChainOracles: binanceOffchainOracles,
+  },
+};

src/config/mainnet.ts

@@ -1,4 +1,4 @@
-import { OffChainOracle, OnChainOracle } from './types';
+import { OffChainOracle, OnChainOracle, OffChainOracles, OnChainOracles } from '../types';
 
 const ethgasstation: OffChainOracle = {
   name: 'ethgasstation',
@@ -73,7 +73,7 @@ const chainlink: OnChainOracle = {
   denominator: '1000000000',
 };
 
-export const offChainOracles: { [key: string]: OffChainOracle } = {
+export const offChainOracles: OffChainOracles = {
   ethgasstation,
   anyblock,
   gasNow,
@@ -82,7 +82,7 @@ export const offChainOracles: { [key: string]: OffChainOracle } = {
   zoltu,
 };
 
-export const onChainOracles: { [key: string]: OnChainOracle } = {
+export const onChainOracles: OnChainOracles = {
   chainlink,
 };
 

src/index.ts

@@ -1,13 +1,23 @@
 import axios from 'axios';
-import config from './config';
-import { GasPrice, OffChainOracle, OnChainOracle, Config, GasPriceKey, Options } from './types';
+import { ChainId, networks } from './config';
+import {
+  Config,
+  Options,
+  GasPrice,
+  GasPriceKey,
+  OffChainOracle,
+  OnChainOracle,
+  OnChainOracles,
+  OffChainOracles,
+} from './types';
 import BigNumber from 'bignumber.js';
 
 export class GasPriceOracle {
   lastGasPrice: GasPrice;
-  offChainOracles = { ...config.offChainOracles };
-  onChainOracles = { ...config.onChainOracles };
+  offChainOracles: OffChainOracles;
+  onChainOracles: OnChainOracles;
   configuration: Config = {
+    chainId: ChainId.MAINNET,
     defaultRpc: 'https://api.mycryptoapi.com/eth',
     timeout: 10000,
   };
@@ -16,6 +26,10 @@ export class GasPriceOracle {
     if (options) {
       Object.assign(this.configuration, options);
     }
+
+    const { offChainOracles, onChainOracles } = networks[this.configuration.chainId];
+    this.offChainOracles = { ...offChainOracles };
+    this.onChainOracles = { ...onChainOracles };
   }
 
   async askOracle(oracle: OffChainOracle): Promise<GasPrice> {

src/types.ts

@@ -9,6 +9,8 @@ export type OffChainOracle = {
   additionalDataProperty: string | null;
 };
 
+export type OffChainOracles = { [key: string]: OffChainOracle };
+
 export type OnChainOracle = {
   name: string;
   rpc?: string;
@@ -17,6 +19,8 @@ export type OnChainOracle = {
   denominator: string;
 };
 
+export type OnChainOracles = { [key: string]: OnChainOracle };
+
 export type GasPrice = {
   [key in GasPriceKey]: number;
 };
@@ -24,8 +28,16 @@ export type GasPrice = {
 export type GasPriceKey = 'instant' | 'fast' | 'standard' | 'low';
 
 export type Options = {
+  chainId?: number;
   defaultRpc?: string;
   timeout?: number;
 };
 
 export type Config = Required<Options>;
+
+export type NetworkConfig = {
+  [key in number]: {
+    offChainOracles: OffChainOracles;
+    onChainOracles: OnChainOracles;
+  };
+};

tests/index.test.ts

@@ -3,12 +3,12 @@
 import { GasPrice, OffChainOracle } from '../src/types';
 import mockery from 'mockery';
 import chai from 'chai';
-import { onChainOracles, offChainOracles } from '../src/config';
 
 import { GasPriceOracle } from '../src/index';
 chai.use(require('chai-as-promised'));
 chai.should();
 let oracle = new GasPriceOracle();
+let { onChainOracles, offChainOracles } = oracle;
 
 before('before', function () {
   const axiosMock = {
@@ -24,6 +24,7 @@ before('before', function () {
 
 beforeEach('beforeEach', function () {
   oracle = new GasPriceOracle();
+  ({ onChainOracles, offChainOracles } = oracle);
 });
 
 describe('constructor', function () {