boojack
84 lines
2.0 KiB
TypeScript
84 lines
2.0 KiB
TypeScript
export const CACHE_DEBOUNCE_DELAY = 500;
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const pendingSaves = new Map<string, ReturnType<typeof window.setTimeout>>();
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const STRUCTURED_CACHE_ENTRY_KIND = "memos.editor-cache";
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const STRUCTURED_CACHE_ENTRY_VERSION = 1;
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function deserializeContent(raw: string): string {
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try {
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const parsed = JSON.parse(raw) as { kind?: unknown; version?: unknown; content?: unknown };
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if (
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parsed.kind === STRUCTURED_CACHE_ENTRY_KIND &&
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parsed.version === STRUCTURED_CACHE_ENTRY_VERSION &&
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typeof parsed.content === "string"
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) {
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return parsed.content;
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}
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} catch {
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// Drafts have historically been stored as raw markdown strings.
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}
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return raw;
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}
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function writeEntry(key: string, content: string): void {
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if (content.trim()) {
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localStorage.setItem(key, content);
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} else {
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localStorage.removeItem(key);
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}
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}
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export const cacheService = {
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key: (username: string, cacheKey?: string): string => {
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return `${username}-${cacheKey || ""}`;
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},
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save: (key: string, content: string) => {
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const pendingSave = pendingSaves.get(key);
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if (pendingSave) {
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window.clearTimeout(pendingSave);
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}
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const timeoutId = window.setTimeout(() => {
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pendingSaves.delete(key);
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writeEntry(key, content);
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}, CACHE_DEBOUNCE_DELAY);
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pendingSaves.set(key, timeoutId);
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},
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saveNow: (key: string, content: string) => {
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const pendingSave = pendingSaves.get(key);
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if (pendingSave) {
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window.clearTimeout(pendingSave);
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pendingSaves.delete(key);
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}
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writeEntry(key, content);
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},
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load(key: string): string {
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const raw = localStorage.getItem(key);
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return raw ? deserializeContent(raw) : "";
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},
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clear(key: string): void {
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const pendingSave = pendingSaves.get(key);
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if (pendingSave) {
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window.clearTimeout(pendingSave);
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pendingSaves.delete(key);
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}
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localStorage.removeItem(key);
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},
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clearAll(): void {
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for (const timeoutId of pendingSaves.values()) {
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window.clearTimeout(timeoutId);
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}
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pendingSaves.clear();
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},
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};
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