实时（node / socket.io）的“管道”如何工作？

Question

I'm currently building a real-time web application that utilizes the MEAN stack (Mongo,Express,Angular,Node). My question relates to how Node (and more specifically Socket.io) work in a real-time app which makes calls to an API (in this case Instagram).

I'm subscribing to several locations (lat/lon coordinates) with the Instagram API. I want my web app to automatically add photos as they are taken (and geo-tagged) around these locations.

How I THINK this will work:

• Subscribe to several locations through the Instagram API
• Instagram sends me a GET request to my callback URL when data at API endpoint changes
• Fire off a GET request TO Instagram in response, based on which endpoint changed
• Save the new photo(s) to Mongo database using my own API
• Emit an event from server to client using Socket.io, containing new photo(s) data
• 'Capture' this event with a Socket.io listener on client side and display new photo(s)

Does this seem reasonable at a detailed level or am I missing (even some tiny) steps?

Answer 1

1. Emit an event from server to client using Socket.io
2. 'Capture' this event with a Socket.io listener on client side
3. Fire off a GET request to my API to pull the new photo(s) from Mongo database

This can be reduced to a single step:

1. Emit an event from server and send the photo as data-uri.

You may need to watch out for the amount of data that can be sent via sockets.