Redis transaction rollback guide with WATCH and MULTI in Node.js
I'm converting an old project and I've been banging my head against this for hours. I've encountered a strange issue with I'm working on a project and hit a roadblock. I've searched everywhere and can't find a clear answer... I'm working with an scenario when using Redis transactions with WATCH and MULTI in my Node.js application. Specifically, I expect that if the key I'm watching changes after calling WATCH, the transaction should unexpected result, but it seems to be executing anyway. Here's the relevant code snippet: ```javascript const redis = require('redis'); const client = redis.createClient(); async function updateValue(key, newValue) { return new Promise((resolve, reject) => { client.watch(key, (err) => { if (err) return reject(err); client.get(key, (err, currentValue) => { if (err) return reject(err); const updatedValue = currentValue + newValue; client.multi() .set(key, updatedValue) .exec((err, result) => { if (err) return reject(err); if (result === null) { console.log('Transaction failed, key was modified.'); return resolve(false); } console.log('Transaction successful!'); resolve(true); }); }); }); }); } ``` I am testing this by modifying the value of the key in another part of my application after the WATCH call but before the MULTI. However, the transaction does not seem to recognize the changes and completes successfully, which is not the expected behavior. I verified that the key is actually being modified in the other part of the code, and Iām using Redis version 6.0.9. Is there something Iām missing, or is there a common pitfall when using WATCH with MULTI that could cause this scenario? Any insights would be appreciated! I'd really appreciate any guidance on this. This is part of a larger mobile app I'm building. The stack includes Javascript and several other technologies.