Lambda: Updater #7
Description
Because AWS S3 service does not enable CORS, the browser S3 client cannot perform certain functions unless it is served from an S3 domain name. I do not wish to introduce a domain name constraint on the Blue Bucket system. So, much of the work of installing/updating the system needs to be implemented as a Lambda function that can be invoked from the browser.
The function has two modes: update mode and query mode.
- Implement the query mode of the Updater:
- Determine the target version, either a specific requested version, or "latest"
- Retrieve the metadata file for the target version from the distribution point
- Scan all existing S3 buckets looking for Blue Bucket metadata files
- Diff the target from the existing files to build a list of components needing update. (If no existing buckets, then all non-bucket components need update.)
- Implement update mode of the Updater:
- Install all the Lambda functions requiring update.
- If S3 components require updating (themes, admin files, etc.), update each bucket in turn.