CD
Cloudflare Developers•9mo ago
Vikash

How to implement code-level caching service?

How to use caching on code-level? I need to cache the getAuthUser(userId) function result on code level to avoid querying D1 again and again as the getAuthUser is a middleware used on all the API routes. So, I built a get/set caching function using a fake url, user/1, user/2 etc. But it doesn't seems to be working and I see undefined in cache.match(cacheKey) response always. 
export const getCached = async (request: HonoRequest, key: string) => {
  const cacheUrl = new URL(request.url);
  cacheUrl.pathname = '/' + key;

  const cacheKey = new Request(cacheUrl.toString(), {
    method: 'GET',
    cf: {
      cacheEverything: true,
      cacheTtl: 86400,
    },
  });

  const cache = caches.default;
  const response = await cache.match(cacheKey);
  console.log('r', response);
  if (response) {
    const json = await response.json();
    console.log('json', json);
  }
};

export const setCached = async (
  request: HonoRequest,
  key: string,
  data: any
) => {
  const cacheUrl = new URL(request.url);
  cacheUrl.pathname = '/' + key;

  const cacheKey = new Request(cacheUrl.toString(), {
    method: 'GET',
    cf: {
      cacheEverything: true,
      cacheTtl: 86400,
    },
  });
  const cache = caches.default;
  const response = new Response(data);
  response.headers.append('Cache-Control', 's-maxage=30');
  await cache.put(cacheKey, response);
};
export const getCached = async (request: HonoRequest, key: string) => {
  const cacheUrl = new URL(request.url);
  cacheUrl.pathname = '/' + key;

  const cacheKey = new Request(cacheUrl.toString(), {
    method: 'GET',
    cf: {
      cacheEverything: true,
      cacheTtl: 86400,
    },
  });

  const cache = caches.default;
  const response = await cache.match(cacheKey);
  console.log('r', response);
  if (response) {
    const json = await response.json();
    console.log('json', json);
  }
};

export const setCached = async (
  request: HonoRequest,
  key: string,
  data: any
) => {
  const cacheUrl = new URL(request.url);
  cacheUrl.pathname = '/' + key;

  const cacheKey = new Request(cacheUrl.toString(), {
    method: 'GET',
    cf: {
      cacheEverything: true,
      cacheTtl: 86400,
    },
  });
  const cache = caches.default;
  const response = new Response(data);
  response.headers.append('Cache-Control', 's-maxage=30');
  await cache.put(cacheKey, response);
};
3 Replies
℠
℠•9mo ago
What does cache.put return? And you're not showing how the two funcs are implemented which might be relevant
Vikash
VikashOP•9mo ago
This is how I am using this cache function. 
export const getUserById = async (
  ctx: Context,
  user_id: number,
  account_id: number
) => {
  const cacheKey = `users-${user_id}`;
  const cacheValue = await getCached(ctx.req, cacheKey);
  if(cacheValue) return cacheValue;

  const sqlQuery = ctx.env.DB.prepare(
    `SELECT * from Users where user_id = ? and account_id = ?`
  ).bind(Number(user_id), Number(account_id));

  const authUser: AuthUser = await sqlQuery.first();
  await setCached(ctx.req, cacheKey, authUser);
  return authUser;
};
export const getUserById = async (
  ctx: Context,
  user_id: number,
  account_id: number
) => {
  const cacheKey = `users-${user_id}`;
  const cacheValue = await getCached(ctx.req, cacheKey);
  if(cacheValue) return cacheValue;

  const sqlQuery = ctx.env.DB.prepare(
    `SELECT * from Users where user_id = ? and account_id = ?`
  ).bind(Number(user_id), Number(account_id));

  const authUser: AuthUser = await sqlQuery.first();
  await setCached(ctx.req, cacheKey, authUser);
  return authUser;
};
The cache.put() : Promise<void> is a void function, so it returns undefined
Vikash
VikashOP•9mo ago
Ok, I get it working. So issue resolved, but It doesn't expire. Even when I set s-maxage=30 header, the match return the value after 30s as well.
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