77 lines
2.1 KiB
TypeScript
77 lines
2.1 KiB
TypeScript
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import { ulid } from "./deps.ts";
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export class Store<T extends object> {
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constructor(
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private readonly db: Deno.Kv,
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private readonly storeKey: Deno.KvKeyPart,
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) {
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}
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async create(value: T): Promise<Model<T>> {
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const id = ulid();
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await this.db.set([this.storeKey, id], value);
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return new Model(this.db, this.storeKey, id, value);
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}
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async get(id: Deno.KvKeyPart): Promise<Model<T> | null> {
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const entry = await this.db.get<T>([this.storeKey, id]);
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if (entry.versionstamp == null) return null;
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return new Model(this.db, this.storeKey, id, entry.value);
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}
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async list(): Promise<Array<Model<T>>> {
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const models: Array<Model<T>> = [];
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for await (const entry of this.db.list<T>({ prefix: [this.storeKey] })) {
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models.push(new Model(this.db, this.storeKey, entry.key[1], entry.value));
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}
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return models;
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}
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}
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export class Model<T extends object> {
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#value: T;
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constructor(
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private readonly db: Deno.Kv,
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private readonly storeKey: Deno.KvKeyPart,
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private readonly entryKey: Deno.KvKeyPart,
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value: T,
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) {
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this.#value = value;
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}
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get value(): T {
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return this.#value;
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}
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async get(): Promise<T | null> {
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const entry = await this.db.get<T>([this.storeKey, this.entryKey]);
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if (entry.versionstamp == null) return null;
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this.#value = entry.value;
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return entry.value;
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}
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async set(value: T): Promise<T> {
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await this.db.set([this.storeKey, this.entryKey], value);
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this.#value = value;
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return value;
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}
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async update(value: Partial<T> | ((value: T) => T)): Promise<T | null> {
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const entry = await this.db.get<T>([this.storeKey, this.entryKey]);
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if (entry.versionstamp == null) return null;
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if (typeof value === "function") {
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entry.value = value(entry.value);
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} else {
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entry.value = { ...entry.value, ...value };
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}
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await this.db.set([this.storeKey, this.entryKey], entry.value);
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this.#value = entry.value;
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return entry.value;
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}
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async delete(): Promise<void> {
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await this.db.delete([this.storeKey, this.entryKey]);
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}
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}
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