web/services/cms/fetchAndCacheEntry.ts

import { resolve as resolveEntry } from "@/utils/entry"

import type { Lang } from "@/constants/languages"

const entryResponseCache: Map<
  string,
  {
    contentType: string | null
    uid: string | null
    expiresAt: number
  }
> = new Map()

let size: number = 0

export const fetchAndCacheEntry = async (path: string, lang: Lang) => {
  const cacheKey = `${path + lang}`
  const cachedResponse = entryResponseCache.get(cacheKey)

  if (cachedResponse && cachedResponse.expiresAt > Date.now() / 1000) {
    console.log("[CMS MIDDLEWARE]: CACHE HIT")
    return cachedResponse
  }

  if (cachedResponse && cachedResponse.expiresAt < Date.now() / 1000) {
    console.log("[CMS MIDDLEWARE]: CACHE STALE")
    size -= JSON.stringify(cachedResponse).length
    entryResponseCache.delete(cacheKey)
  } else {
    console.log("[CMS MIDDLEWARE]: CACHE MISS")
  }

  const { contentType, uid } = await resolveEntry(path, lang)
  let expiresAt = Date.now() / 1000
  if (!contentType || !uid) {
    expiresAt += 600
  } else {
    expiresAt += 3600 * 12
  }
  const entryCache = { contentType, uid, expiresAt }
  size += JSON.stringify(entryCache).length
  console.log("[CMS MIDDLEWARE] Adding to cache", entryCache)
  console.log("[CMS MIDDLEWARE] Cache size (total)", size)
  entryResponseCache.set(cacheKey, entryCache)

  return {
    contentType,
    uid,
  }
}