77 lines
2.2 KiB
TypeScript
77 lines
2.2 KiB
TypeScript
"use strict";
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import { ethers } from "ethers";
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import { version } from "./_version";
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const logger = new ethers.utils.Logger(version);
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export class MetamaskProvider extends ethers.providers.Web3Provider {
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_pollingAccount: any;
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_pollAccountFunc: () => void;
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constructor(ethereum?: ethers.providers.AsyncSendable) {
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if (!ethereum) {
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ethereum = (<any>global).ethereum;
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if (!ethereum) {
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logger.throwError("could not auto-detect global.ethereum", ethers.errors.UNSUPPORTED_OPERATION, {
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operation: "window.ethereum"
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});
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}
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}
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super(ethereum);
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let _account: string = null;
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ethers.utils.defineReadOnly(this, "_pollAccountFunc", () => {
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let account: string = null;
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if (account === _account) { return; }
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console.log("poll");
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this.emit("account", account, _account);
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_account = account;
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});
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super(ethereum);
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}
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getSigner(addressOrIndex?: string | number): ethers.providers.JsonRpcSigner {
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if (!this.enabled) { return null }
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return super.getSigner(addressOrIndex);
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}
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get enabled(): boolean {
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return false;
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}
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_startPollingAccount(): void {
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if (this._pollingAccount) { return; }
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console.log("start polling for account changes including to/from null");
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this._pollingAccount = setInterval(this._pollAccountFunc, 1000);
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}
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_stopPollingAccount(): void {
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if (!this._pollingAccount) { return; }
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console.log("stop polling for account changes including to/from null");
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clearInterval(this._pollingAccount);
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this._pollingAccount = null;
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}
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on(eventName: ethers.providers.EventType, listener: ethers.providers.Listener): this {
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super.on(eventName, listener);
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if (this.listenerCount("account") > 0) {
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this._startPollingAccount();
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}
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return this;
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}
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off(eventName: ethers.providers.EventType, listener?: ethers.providers.Listener): this {
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super.off(eventName, listener);
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if (this.listenerCount("account") === 0) {
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this._stopPollingAccount();
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}
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return this;
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}
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}
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