Release Infrastructure/BOSS/Design

This presentation introduces the BOSS system.

Contents 1 BOSS Overview 2 Workflow : Ruote 3 Workflow 4 AMQP 5 Talking to the BOSS 6 Communication : Queues 7 Communication : RPC 8 Communication : BOSS Participant

BOSS Overview

BOSS is a framework to orchestrate workflow steps around the build system.

Workflow : Ruote

Ruote has been selected as the workflow framework :

• Straightforward
• Concise
• Clean design
• Ruby core
• JSON messages
• Language agnostic
• Active + welcoming upstream

Workflow

• Jobsheet based (not state-machine):
  • The workflow passes a 'sheet of paper' between participants
  • Each participant looks at the paper, does some work, writes on it and passes it on
  • The engine decides who gets the paper next
• Paper = JSON structure
• Multiple independent workflows can co-exist

AMQP

• Reliability
• Performance
• Flexibility
• Simplicity
• Multiple Language Bindings
• Persistence, concurrence and queuing “for free”

Talking to the BOSS

• AMQP – Queues and RPC
  • Queues for 'work'
  • RPC for immediate calls (see BOSS/AIR)

• Messages – all JSON
  • Workitems
  • Service request/response

Communication : Queues

Communication : RPC

Communication : BOSS Participant

• Receive a workitem
• Process it
• Return it

• Control thread using RPC allows cancel/status