How do I set a timeout on a Mongoose query?

Question

I am using Mongoose with a very large Mongo database, and I want costly queries like MySet.find({}) to time out after 10 seconds.

I\'ve tried setting a

Answer 1

This is the pattern I have started to use a lot.

// Default time out timeout in ms
const DEFAULT_TIME_OUT = 500;

// Default timeout message
const DEFAULT_MESSAGE = `Timeout fetching data(${DEFAULT_TIME_OUT}ms)`;

// Function that triggers a Promise's reject after a set amount of time
function timeoutReject(reject, message, timeout) {
  setTimeout(function(){

    // Reject the Promise if the time is reached
    reject(message || DEFAULT_MESSAGE);
  }, timeout || DEFAULT_TIME_OUT);
};

function youAreNotAuthentic() {
  // Logic to validate user and request return boolean
};

// Throw error if the user cannot access this data
function youCantTouchThis() {
  throw new Error('You cannot access this data.');
};

// Function to request data
function getDataById(_id) {
  // First check if this is authentic
  if (youAreNotAuthentic()) youCantTouchThis();

  // Return a Promise
  return new Promise((resolve, reject) => {

    // Set a timeout to reject if we do not get a response in x time
    timeoutReject(reject, 'Custom Message', 300);

   // Could look like this to just use the defaults
   // timeoutReject(reject);

    // Query for the data
    Collection.findOne({ _id }).then(data => {

       // Resolve the Promise with the retrieved data
       resolve(data);
    });
  });
};

This way I have a default timeout applied to most requests but if I need to adjust on an per call basis then I can. Or I can be made aware of areas that need better indexing.