Cleanup docs and the chaos middleware

Make the CH middleware actually work. Needs a bit of a hack to route

the fake version.bind and friends zone to the correct handler. Fiddle

with the order in directive.go so that CH queries get logged as well.



Secondly add class rewriting to the rewrite middleware handler and also

log the class by default.

server/server.go

@@ -17,6 +17,7 @@ import (
 
 	"golang.org/x/net/context"
 
+	"github.com/miekg/coredns/middleware/chaos"
 	"github.com/miekg/dns"
 )
 
@@ -97,7 +98,6 @@ func New(addr string, configs []Config, gracefulTimeout time.Duration) (*Server,
 
 	// Set up each zone
 	for _, conf := range configs {
-		// TODO(miek): something better here?
 		if _, exists := s.zones[conf.Host]; exists {
 			return nil, fmt.Errorf("cannot serve %s - host already defined for address %s", conf.Address(), s.Addr)
 		}
@@ -111,6 +111,19 @@ func New(addr string, configs []Config, gracefulTimeout time.Duration) (*Server,
 		}
 
 		s.zones[conf.Host] = z
+
+		// A bit of a hack. Loop through the middlewares of this zone and check if
+		// they have enabled the chaos middleware. If so add the special chaos zones.
+	Middleware:
+		for _, mid := range z.config.Middleware {
+			fn := mid(nil)
+			if _, ok := fn.(chaos.Chaos); ok {
+				for _, ch := range []string{"authors.bind.", "version.bind.", "version.server.", "hostname.bind.", "id.server."} {
+					s.zones[ch] = z
+				}
+				break Middleware
+			}
+		}
 	}
 
 	return s, nil