Websocket interface for streaming

[kris-lab]

META ISSUE

All streaming logic should be a part of elasticfeed engine. What is required:

• websocket support
• long pooling support
• own client (not socket.io, sockjs) as native very simple implementation. On top of it will be elasticfeed.js client
• scaling: multi machine communication (I suggest redis pub/sub)
• logic of channels/rooms
• handshake authentication
  • internal
  • using hooks to external resource
• protocol:
  • entry actions: add/delete/update
  • feed actions: load/load-more/reload/hide/show/rest
  • metrics actions: behaviours
• app.conf should be configurable that elasticfeed works in streaming mode as well. Should be passible that streaming mode and api mode work together on single application instance.

Why not socket-redis

• require installaltion of another software
• require specific bridges: plugin manager, plugins
• sockjsfor client is very heavy; a lot of code; hard to maintenance; to much time on parsing and loading; hard for optimization.
• add delay for each request
• require that elasticfeed API needs to learn who is connected etc!?

Useful resources:

• http://gary.burd.info/go-websocket-chat
• https://github.com/beego/samples/tree/master/WebIM

Implementation:

• PART 1: Implement full bi-directional communication over WebSocket/LP #27 PART 1
• PART 2: Implement full bi-directional communication over WebSocket/LP #28 PART 2
• PART 3: Implement full bi-directional communication over WebSocket/LP #29 PART 3
• PART 4: Implement full bi-directional communication over WebSocket/LP/SSE #30 PART 4, Implement UI, Viewer metrics logic sdk-js#10