Lazy Cache Version Metadata in Edge-to-Origin Lambda

[huntharo]

Motivations

• Each request is re-fetching metadata about versions from the DB
• This data is immutable so it can be lazily cached / saved in memory
• At this point there is not a need to use an LRU as there simply is not enough data about versions to use more than a reasonable amount of memory

Brainstorming Options

• Denormalize the default version info (url, etc.) into the default rule record
  • This makes it so that all rules do not need to be downloaded
  • Can download only the default rule and embedded info about current default version
  • That enables building a lazy cache of other discovered versions
  • Only 1 record has to be checked when routing an app request

To-Do

• Save info into { [appname: string]: { [semver: string]: { ... } } } object
• Check the object first before hitting DB