e0fe018f34
Test code:
useEffect(() => {
setTimeout(() => testFunctionSync(), 5000);
}, []);
useEffect(() => {
testFunction();
}, []);
const testFunctionSync = () => {
console.log("sleeping not");
// sleep(2000);
console.log("woke up not");
throw new Error("Handle me");
};
const testFunction = async () => {
console.log("sleeping");
sleep(2000);
console.log("woke up");
throw new Error("Handle me");
};
Refs:
- https://developer.mozilla.org/en-US/docs/Web/API/Window/unhandledrejection_event
- https://github.com/megahertz/electron-log/blob/master/src/renderer/lib/RendererErrorHandler.js
109 lines
3.4 KiB
TypeScript
109 lines
3.4 KiB
TypeScript
import { isDevBuild } from "@/next/env";
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import log from "@/next/log";
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/**
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* Log a standard startup banner.
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*
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* This helps us identify app starts and other environment details in the logs.
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*
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* @param appId An identifier of the app that is starting.
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* @param userId The uid for the currently logged in user, if any.
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*/
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export const logStartupBanner = (appId: string, userId?: number) => {
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// TODO (MR): Remove the need to lowercase it, change the enum itself.
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const appIdL = appId.toLowerCase();
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const sha = process.env.GIT_SHA;
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const buildId = isDevBuild ? "dev " : sha ? `git ${sha} ` : "";
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log.info(`Starting ente-${appIdL}-web ${buildId}uid ${userId ?? 0}`);
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};
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/**
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* Attach handlers to log any unhandled exceptions and promise rejections.
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*
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* @param attach If true, attach handlers, and if false, remove them. This
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* allows us to use this in a React hook that cleans up after itself.
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*/
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export const logUnhandledErrorsAndRejections = (attach: boolean) => {
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const handleError = (event: ErrorEvent) => {
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log.error("Unhandled error", event.error);
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};
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const handleUnhandledRejection = (event: PromiseRejectionEvent) => {
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log.error("Unhandled promise rejection", event.reason);
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};
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if (attach) {
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window.addEventListener("error", handleError);
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window.addEventListener("unhandledrejection", handleUnhandledRejection);
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} else {
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window.removeEventListener("error", handleError);
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window.removeEventListener(
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"unhandledrejection",
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handleUnhandledRejection,
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);
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}
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};
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interface LogEntry {
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timestamp: number;
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logLine: string;
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}
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const lsKey = "logs";
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/**
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* Record {@link message} in a persistent log storage.
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*
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* These strings, alongwith associated timestamps, get added to a small ring
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* buffer, whose contents can be later be retrieved by using {@link savedLogs}.
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*
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* This ring buffer is persisted in the browser's local storage.
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*/
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export const logToDisk = (message: string) => {
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const maxCount = 1000;
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const log: LogEntry = { logLine: message, timestamp: Date.now() };
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try {
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const logs = logEntries();
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if (logs.length > maxCount) {
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logs.slice(logs.length - maxCount);
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}
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logs.push(log);
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localStorage.setItem(lsKey, JSON.stringify({ logs }));
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} catch (e) {
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console.error("Failed to persist log", e);
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if (e instanceof Error && e.name === "QuotaExceededError") {
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localStorage.removeItem(lsKey);
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}
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}
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};
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const logEntries = (): unknown[] => {
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const s = localStorage.getItem("logs");
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if (!s) return [];
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const o: unknown = JSON.parse(s);
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if (!(o && typeof o == "object" && "logs" in o && Array.isArray(o.logs))) {
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console.error("Unexpected log entries obtained from local storage", o);
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return [];
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}
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return o.logs;
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};
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/**
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* Return a string containing all recently saved log messages.
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*
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* @see {@link persistLog}.
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*/
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export const savedLogs = () => logEntries().map(formatEntry).join("\n");
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const formatEntry = (e: unknown) => {
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if (e && typeof e == "object" && "timestamp" in e && "logLine" in e) {
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const timestamp = e.timestamp;
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const logLine = e.logLine;
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if (typeof timestamp == "number" && typeof logLine == "string") {
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return `[${new Date(timestamp).toISOString()}] ${logLine}`;
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}
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}
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return String(e);
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};
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