AWS

Notes on implementing lower levels with API Gateway + Lambda + DynamoDB.

Free tier limits

• API
  • 1M requests / month
• Lambda
  • 1M requests / month
  • 400,000 GB-seconds / month
• Dynamo
  • 25GB persisted state
  • 2.5M read requests / month
  • 25 reads / second
  • 25 writes / second

Plan

• Implement Engine in Lambda, fronted by API service, persisting to Dynamo.
• First step towards that is the old "schizm" project built on the same parts.
  • A wiki where the content of the wiki includes the bulk of its implementation

MVP

• Can create a new page by going to a non-existent page and saving new contents
• Lambda code stored in mutable objects persisted to Dynamo
• Objects are copy-on-write

Bootstrapping: MinimalDB + starting config

To get up and running we need a working API and pre-populated Lambda functions.

/send -> dispatchMessage

Dynamo schema

Tables

• Objects

  • number objId -> partition key
  • number version
  • string methods
  • string data

• LambdaControl...

API

Routes

• /
• Greeting, login, etc
• /client
• Serves up the HTML and code which know how to talk to /send
• /send
• method call interface
• params
• number id
• number version
• string messageName
• object data
• /admin
• Bootstrapping hack
• /admin/setObject
• number id
• number version
• If missing or non-numeric, creates a new version of the object
• object data
• /admin/getObject
• number targetId
• number version
• If missing or non-numeric, returns list of all versions