mongodb-activity-feed

Activity Feed Node & Mongo DB

Simple example of how to build a news feed with Node and MongoDB. I created it for this blogpost: "Building Activity Feeds with MongoDB vs the alternatives"

https://docs.google.com/document/d/11gfMOPgE476fLsb2sXYy955X2G4egUv4p7-zlXdf8hU/edit

It uses CRDTs https://en.wikipedia.org/wiki/Conflict-free_replicated_data_type to reduce the need for locks.

News Feed Mongo

Notification Feed Node

Timeline

Init

import {FeedManager} from 'mongodb-activity-feed'
const fm = new FeedManager(mongoConnection, redisConnection)
fm.feed('user', '123')

Adding an activity

Add an activity like this.

fm.addActivity(activity, feed)

fm.removeActivity(activityID)

fm.removeActivityFromFeed(activityID, feed)

Follow a feed

fm.follow(a, b)
fm.unfollow(a, b)

Read a feed from MongoDB

fm.readFeed('user', '123', options)

Running tests

NODE_ENV=test node_modules/mocha/bin/_mocha --timeout 15000 --require test-entry.js "test/**/*.js"

Or if you're lazy

yarn test

Pros/Cons

The cost/performance of a MongoDB based activity feed is substantially worse compared to Stream (https://getstream.io/). Unless you need to run your feeds on-prem you should not use this in prod.