[cache-manager] Add an option to update all layers/stores on refresh

[meteorlxy]

Is your feature request related to a problem? Please describe.

For example, there is a 2-layer cache:

Layer 1 -> ttl=1d
Layer 2 -> ttl=2d

Both of them have refreshThreshold=1h

After 23h, the Layer 1 will refresh according to refreshThreshold.

However, per the current implementation, only stores.slice(0, i + 1) (only Layer 1 in this case) will be updated, while the Layer 2 still have stale data:

cacheable/packages/cache-manager/src/index.ts

Lines 206 to 215 in 64f4341

	if (shouldRefresh) {
	coalesceAsync(`+++${key}`, fnc)
	.then(async result => {
	try {
	await set(stores.slice(0, i + 1), key, result, ms);
	eventEmitter.emit('refresh', {key, value: result});
	} catch (error) {
	eventEmitter.emit('refresh', {key, value, error});
	}
	})

If the Layer 1 somehow crashed between 1d and 2d, the cache will fallback to Layer 2 with stale data, which is not ideal.

Describe the solution you'd like

Provide a new option like refreshAllStores to update all layers on refresh.

[jaredwray]

@meteorlxy - We will get this merged and published in the next 5-7 days! 🎉