caddy-ui-version

Caddy HTTP handler that selects a UI document-root name from a SQLite database keyed by request host, and exposes it as {http.vars.ui_version}.

Caddyfile

{
	order ui_version before root
}

:80 {
	ui_version {
		sqlite file:/ui-versions.sqlite?immutable=1&mode=ro&nolock=1
		default original
	}

	root * /{http.vars.ui_version}
	file_server
}

SQLite schema

CREATE TABLE domains (
  name TEXT PRIMARY KEY NOT NULL,
  ui_version TEXT NOT NULL
);

name is the bare hostname (lowercase, no port). Missing hosts use default (typically original).

The sample DB maps dagplannen.nl → modern.

Update strategy

Same model as CoreDNS nameshift_context:

• Open a stable pool against an immutable read-only URI
• Connections recycle every 5 minutes (SetConnMaxLifetime)
• Publishers replace /ui-versions.sqlite atomically (mv)
• In-memory host cache is cleared every 15 minutes

Build

xcaddy build --with github.com/randock/caddy-ui-version@v0.0.2

Sample database

go run ./cmd/mksampledb -o ui-versions.sqlite