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cache.ts
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import type { HookContext, Id } from '@feathersjs/feathers';
import { getItems } from '../utils/get-items';
import { clone as defaultClone } from '../common/clone';
export type CacheMap<T> = Map<string | number, T>;
export interface CacheOptions<T> {
clone?(item: T): T;
makeCacheKey?(id: Id): string;
}
const defaultMakeCacheKey = (key: any) => key;
/**
* Persistent, most-recently-used record cache for services.
*
* @see https://hooks-common.feathersjs.com/hooks.html#cache
*/
export function cache<H extends HookContext = HookContext, T = any>(
cacheMap: CacheMap<T>,
keyField?: string,
options?: CacheOptions<T>,
) {
const clone = options?.clone || defaultClone;
const makeCacheKey = options?.makeCacheKey || defaultMakeCacheKey;
return (context: H) => {
keyField = keyField || context.service?.id; // Will be undefined on client
let items = getItems(context);
items = Array.isArray(items) ? items : [items];
const query = context.params.query || {};
if (context.type === 'after') {
if (context.method === 'remove') {
items.forEach((item: any) => {
const idName = getIdName(keyField, item);
const key = makeCacheKey(item[idName]);
cacheMap.delete(key);
});
return context;
}
if (query.$select) return context;
items.forEach((item: any) => {
const idName = getIdName(keyField, item);
const key = makeCacheKey(item[idName]);
cacheMap.set(key, clone(item));
});
return context;
}
switch (context.method) {
case 'find': // fall through
case 'remove': // skip remove in before remove
case 'create':
return context;
case 'get': {
if (!Object.keys(query).length) {
const key = makeCacheKey(context.id!);
const value = cacheMap.get(key);
if (value) context.result = value;
}
return context;
}
default: // update, patch, remove
if (context.id) {
cacheMap.delete(context.id);
return context;
}
items.forEach((item: any) => {
const idName = getIdName(keyField, item);
const key = makeCacheKey(item[idName]);
cacheMap.delete(key);
});
}
return context;
};
}
function getIdName(keyField: any, item: any) {
if (keyField) return keyField;
return '_id' in item ? '_id' : 'id';
}