Created
May 6, 2019 10:12
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Web3Singletone template
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| import Web3 from 'web3' | |
| import Window from './window' | |
| // Singletone Class | |
| class Web3Factory { | |
| public web3: Web3 | |
| private static _instance: Web3Factory | |
| // Private Constructor | |
| private constructor(window: Window) { | |
| if (window.ethereum) { | |
| this.getPermissionFromMetabask(window.ethereum) | |
| this.web3 = new Web3(window.ethereum) | |
| } else { | |
| this.web3 = this.createNewHttpProvider() | |
| } | |
| } | |
| public static get instance(): Web3Factory { | |
| if (!this._instance) { | |
| this._instance = new Web3Factory(window) | |
| } | |
| return this._instance | |
| } | |
| public getWeb3(): Web3 { | |
| return this.web3 | |
| } | |
| private async getPermissionFromMetabask(ethereum: any): Promise<void> { | |
| try { | |
| await ethereum.enable() | |
| } catch (error) {} | |
| } | |
| private createNewHttpProvider(): Web3 { | |
| return new Web3( | |
| new Web3.providers.HttpProvider( | |
| 'https://{your infura url}' | |
| ) | |
| ) | |
| } | |
| } | |
| export default Web3Factory |
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| import Web3 from 'web3' | |
| declare global { | |
| interface Window { | |
| web3: Web3 | |
| ethereum: any | |
| } | |
| } | |
| export default Window |
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