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Language agnostic technologies introduced in pi web-agent 0.4rc2

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Andreas Galazis
Andreas Galazis

This document summarizes a talk on language agnostic technologies introduced in pi-web-agent 0.4rc2. The talk discussed using WebSockets for low latency communication between clients and servers, but noted this did not fully solve the problem. It then described Websocketd, which allows WebSockets to be used for existing applications, and WebsocketdBro, which combines Websocketd with RabbitMQ to enable message broadcasting. The talk concluded by noting these tools address common problems and help attract different types of developers.

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CSC Knowledge Summit 4/2015 Language Agnostic Technologies introduced in pi-web-agent 0.4rc2 Speaker: Andreas Galazis
So are you going to talk about Message queues? Not exactly ... You'll see that the problem we are trying to solve is not directly related with the purpose of message queues.
First couple of problems We need low latency communication between the client and the server We need full duplex communication between the server
Previous solutions Regular http requests:
Previous solutions Ajax Polling
Solution: Html5 WebSockets
Problem solved? NO!
Pi Web Agent is A Platform Whats the point of having a platform?(unified development process/attract different developers ) I can build my own websocket server. There exist a variety of modules/libraries that can provide websocket support for each language. What about newcomers that have to figure out what they should use? Try to build web socket server to serve your bash script. Try to plug websockets to an existing application on your linux machine.
Problem not solved yet!
Websocketd It's like CGI, twenty years later, for WebSockets A web socket daemon for unix machines -Doug McIlroy inventor of the Unix pipe Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface.
Websocketd Write programs that do one thing and do it well! Websocketd really does one thing... For every connection :Run one instance of your application with its stdin/stdout converted to bidirectional websocket communication What if you want to broadcast your messages?
Problem not solved yet!
Publish/Subscribe message queue-fanout In our case rabbitMQ was used The scenario components: Producer: user application that sends messages. Exchange: receives messages from producers and it pushes them to queues Queue: a buffer that stores messages. Consumer: application that receives messages. Bindings: the relationship between the exchange and the que
Putting it all together:WebsocketdBro So do people need to care about using the two technologies together? WebsocketdBro( a websocketd broadcaster): your app Websocketd runs consumers Browser Browser
Questions?
References rabbitmq - Provides robust messaging for applications! websocketd - WebSockets the UNIX way! websocketdBro - Combines rabbitmq and websocketd to support message broadcasting

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Language agnostic technologies introduced in pi web-agent 0.4rc2

  • 1. CSC Knowledge Summit 4/2015 Language Agnostic Technologies introduced in pi-web-agent 0.4rc2 Speaker: Andreas Galazis
  • 2. So are you going to talk about Message queues? Not exactly ... You'll see that the problem we are trying to solve is not directly related with the purpose of message queues.
  • 3. First couple of problems We need low latency communication between the client and the server We need full duplex communication between the server
  • 8. Pi Web Agent is A Platform Whats the point of having a platform?(unified development process/attract different developers ) I can build my own websocket server. There exist a variety of modules/libraries that can provide websocket support for each language. What about newcomers that have to figure out what they should use? Try to build web socket server to serve your bash script. Try to plug websockets to an existing application on your linux machine.
  • 10. Websocketd It's like CGI, twenty years later, for WebSockets A web socket daemon for unix machines -Doug McIlroy inventor of the Unix pipe Write programs that do one thing and do it well. Write programs to work together. Write programs to handle text streams, because that is a universal interface.
  • 11. Websocketd Write programs that do one thing and do it well! Websocketd really does one thing... For every connection :Run one instance of your application with its stdin/stdout converted to bidirectional websocket communication What if you want to broadcast your messages?
  • 13. Publish/Subscribe message queue-fanout In our case rabbitMQ was used The scenario components: Producer: user application that sends messages. Exchange: receives messages from producers and it pushes them to queues Queue: a buffer that stores messages. Consumer: application that receives messages. Bindings: the relationship between the exchange and the que
  • 14. Putting it all together:WebsocketdBro So do people need to care about using the two technologies together? WebsocketdBro( a websocketd broadcaster): your app Websocketd runs consumers Browser Browser
  • 16. References rabbitmq - Provides robust messaging for applications! websocketd - WebSockets the UNIX way! websocketdBro - Combines rabbitmq and websocketd to support message broadcasting
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