Halit Aksoy
f6136be007
- Valkey client that fails commands at once while Valkey is down instead of queueing them, and logs connection errors once - ValkeyLiveGameStore: live game snapshots and finished games waiting to be saved, loaded with SCAN on startup - ValkeyCache: JSON values with a TTL; errors count as cache misses - Integration tests against a real Valkey, including an unreachable one
41 lines
1.3 KiB
TypeScript
41 lines
1.3 KiB
TypeScript
import { Valkey } from "iovalkey";
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const PREFIX = "mancala:cache:";
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// Short-lived cache of JSON values. Never fails: errors count as a miss, so callers just compute the value.
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export interface Cache {
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getJson<T>(key: string): Promise<T | undefined>;
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setJson(key: string, value: unknown, ttlSeconds: number): Promise<void>;
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delete(...keys: string[]): Promise<void>;
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}
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export class ValkeyCache implements Cache {
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constructor(private readonly client: Valkey) { }
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async getJson<T>(key: string): Promise<T | undefined> {
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try {
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const value = await this.client.get(PREFIX + key);
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return value === null ? undefined : JSON.parse(value) as T;
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} catch (err) {
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return undefined;
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}
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}
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async setJson(key: string, value: unknown, ttlSeconds: number): Promise<void> {
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try {
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await this.client.set(PREFIX + key, JSON.stringify(value), "EX", ttlSeconds);
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} catch (err) {
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// A missing cache entry only costs a database query.
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}
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}
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async delete(...keys: string[]): Promise<void> {
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if (keys.length === 0) return;
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try {
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await this.client.del(...keys.map((key) => PREFIX + key));
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} catch (err) {
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// Entries expire on their own.
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}
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}
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}
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