Move server tracking in program into global memory state

server/collection.go

@@ -0,0 +1,39 @@
+package server
+
+type Collection struct {
+	items []*Server
+}
+
+// Return all of the items in the collection.
+func (c *Collection) All() []*Server {
+	return c.items
+}
+
+// Adds an item to the collection store.
+func (c *Collection) Add(s *Server) {
+	c.items = append(c.items, s)
+}
+
+// Returns only those items matching the filter criteria.
+func (c *Collection) Filter(filter func (*Server) bool) []*Server {
+	r := make([]*Server, 0)
+	for _, v := range c.items {
+		if filter(v) {
+			r = append(r, v)
+		}
+	}
+
+	return r
+}
+
+// Returns a single element from the collection matching the filter. If nothing is
+// found a nil result is returned.
+func (c *Collection) Find(filter func (*Server) bool) *Server {
+	for _, v := range c.items {
+		if filter(v) {
+			return v
+		}
+	}
+
+	return nil
+}