Cache Expensive Resources in Rules

If you want to extend Auth0, we highly recommend you use Actions, which are a cornerstone of our overall extensibility product. With Actions, you have access to rich type information, inline documentation, and public npm packages, and can connect external integrations that enhance your overall extensibility experience. To learn more about what Actions offer, read Understand How Auth0 Actions Work.

In Rules you can store expensive resources using the global object. The global object survives individual execution, so you can reuse things stored there instead of creating them every time a Rule is run. However, the Rules environment can be recycled at any time so your code must always check that global contains what you expect.

This example shows how to use the global object to keep a MongoDB connection:

//If the db object is there, use it.
if (global.db){
  return query(global.db, callback);
}

//If not, get the db (mongodb in this case)
mongo('mongodb://user:pass@mymongoserver.com/my-db',  function (db){
  global.db = db;
  return query(db, callback);
});

//Do the actual work
function query(db, cb){
  // Do something with db
  ...
  return cb(null, user, context);
}

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To learn more about using MongoDB, read the MongoDB Manual.

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Cache Expensive Resources in Rules