First commit

server/zones.go

@@ -0,0 +1,28 @@
+package server
+
+import "github.com/miekg/coredns/middleware"
+
+// zone represents a DNS zone. While a Server
+// is what actually binds to the address, a user may want to serve
+// multiple zones on a single address, and this is what a
+// zone allows us to do.
+type zone struct {
+	config Config
+	stack  middleware.Handler
+}
+
+// buildStack builds the server's middleware stack based
+// on its config. This method should be called last before
+// ListenAndServe begins.
+func (z *zone) buildStack() error {
+	z.compile(z.config.Middleware)
+	return nil
+}
+
+// compile is an elegant alternative to nesting middleware function
+// calls like handler1(handler2(handler3(finalHandler))).
+func (z *zone) compile(layers []middleware.Middleware) {
+	for i := len(layers) - 1; i >= 0; i-- {
+		z.stack = layers[i](z.stack)
+	}
+}