CODEWITHSUNDEEP
node.jsexpressasync-await
suchcodemuchwow
suchcodemuchwow

Reputation: 1056

express.js without affecting response

Let's say we have a controller which fetches data from 3rd party service, save that data to db and send response to the client:

const findUser = async (req, res, next) => {
  if (req.params.username) {
    const resp_ = await fetchFunction (req.params.username)
    /* This part is where I have problem*/
    Option 1: 
    await db.save(resp_);
    Option 2:
    db.save(resp_);
    Option 3: 
    db.save(resp_).then(param => /*Do nothing*/ clg(param)).catch(err => clg(err))

    res.json(resp_)
  }
};

I don't want to block async flow in this controller if I use option 1 it is going to wait for db.save() function to finish and I think there is no way I can implement this behaviour with async/await. Which option is preferable way or are there any other way I can sen response to client without blocking flow.

[Edit]: Option 2 is kind a silly implementation but I just added to understand differences.

Upvotes: 0

Views: 27

Answers (1)

Aritra Chakraborty
Aritra Chakraborty

Reputation: 12552

If you want to do those operations simultaneously then you can use Promise.all() which parallelise the functions.

like, 

await Promise.all([db.save(resp_), Promise.resolve(1).then(()=>res.json(resp_))]);`

Or, If you don't care if the data gets saved or not then Option 2 is not that bad of a choice.

Upvotes: 1

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