byGalax
38 lines
1.3 KiB
TypeScript
38 lines
1.3 KiB
TypeScript
// In-memory cache of the most-recently-rendered messages for each
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// conversation. Survives React component unmount/remount (used by
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// `useConversationMessages` to initialize state synchronously when
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// ConversationPage is remounted on chat switch). Session-scoped — lost
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// on full app reload. The SQLite cache (`messageCache.ts`) is still the
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// source of truth for cross-session persistence; this layer just shaves
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// off the round-trip-to-disk spinner flash.
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//
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// Two-tier semantics:
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// * `hasCachedMessages(id)` returns true even for a known-empty chat
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// so the hook can suppress the loading spinner on re-entry.
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// * `getCachedMessages(id)` returns a defensive copy so callers can't
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// mutate the cached array.
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import type { DecryptedMessage } from '@chat-app/shared/chat';
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const cache = new Map<string, DecryptedMessage[]>();
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export function getCachedMessages(conversationId: string): DecryptedMessage[] {
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const stored = cache.get(conversationId);
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return stored ? stored.slice() : [];
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}
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export function hasCachedMessages(conversationId: string): boolean {
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return cache.has(conversationId);
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}
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export function setCachedMessages(
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conversationId: string,
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messages: DecryptedMessage[],
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): void {
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cache.set(conversationId, messages.slice());
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}
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export function __resetForTests(): void {
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cache.clear();
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}
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