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core/setup/etcd.go

+package setup
+
+import (
+	"log"
+	"os"
+
+	"github.com/miekg/coredns/middleware"
+	"github.com/miekg/coredns/middleware/file"
+	"github.com/miekg/dns"
+)
+
+// File sets up the file middleware.
+func File(c *Controller) (middleware.Middleware, error) {
+	zones, err := fileParse(c)
+	if err != nil {
+		return nil, err
+	}
+	return func(next middleware.Handler) middleware.Handler {
+		return file.File{Next: next, Zones: zones}
+	}, nil
+
+}
+
+func fileParse(c *Controller) (file.Zones, error) {
+	// Maybe multiple, each for each zone.
+	z := make(map[string]file.Zone)
+	names := []string{}
+	for c.Next() {
+		if c.Val() == "file" {
+			// file db.file [origin]
+			if !c.NextArg() {
+				return file.Zones{}, c.ArgErr()
+			}
+			fileName := c.Val()
+
+			origin := c.ServerBlockHosts[c.ServerBlockHostIndex]
+			if c.NextArg() {
+				c.Next()
+				origin = c.Val()
+			}
+			// normalize this origin
+			origin = middleware.Host(origin).StandardHost()
+
+			zone, err := parseZone(origin, fileName)
+			if err == nil {
+				z[origin] = zone
+			}
+			names = append(names, origin)
+		}
+	}
+	return file.Zones{Z: z, Names: names}, nil
+}
+
+//
+// parsrZone parses the zone in filename and returns a []RR or an error.
+func parseZone(origin, fileName string) (file.Zone, error) {
+	f, err := os.Open(fileName)
+	if err != nil {
+		return nil, err
+	}
+	tokens := dns.ParseZone(f, origin, fileName)
+	zone := make([]dns.RR, 0, defaultZoneSize)
+	for x := range tokens {
+		if x.Error != nil {
+			log.Printf("[ERROR] failed to parse %s: %v", origin, x.Error)
+			return nil, x.Error
+		}
+		zone = append(zone, x.RR)
+	}
+	return file.Zone(zone), nil
+}
+
+const defaultZoneSize = 20 // A made up number.

middleware/etcd/backend.go

@@ -11,6 +11,11 @@ import (
 	etcdc "github.com/coreos/etcd/client"
 )
 
+const (
+	priority = 10   // default priority when nothing is set
+	ttl      = 3600 // default ttl when nothing is set
+)
+
 func (g *Backend) Records(name string, exact bool) ([]msg.Service, error) {
 	path, star := msg.PathWithWildcard(name)
 	r, err := g.get(path, true)
@@ -125,7 +130,7 @@ Nodes:
 		serv.Key = n.Key
 		serv.Ttl = g.calculateTtl(n, serv)
 		if serv.Priority == 0 {
-			serv.Priority = int(g.config.Priority)
+			serv.Priority = priority
 		}
 		sx = append(sx, *serv)
 	}
@@ -139,7 +144,7 @@ func (g *Backend) calculateTtl(node *etcdc.Node, serv *msg.Service) uint32 {
 	etcdTtl := uint32(node.TTL)
 
 	if etcdTtl == 0 && serv.Ttl == 0 {
-		return g.config.Ttl
+		return ttl
 	}
 	if etcdTtl == 0 {
 		return serv.Ttl

middleware/etcd/etcd.go

@@ -2,6 +2,7 @@
 package etcd
 
 import (
+	"github.com/miekg/coredns/middleware"
 	"github.com/skynetservices/skydns/singleflight"
 
 	etcd "github.com/coreos/etcd/client"
@@ -10,25 +11,18 @@ import (
 
 type (
 	Etcd struct {
-		Ttl      uint32
-		Priority uint16
-		Backend  *Backend
+		Next middleware.Handler
+
+		client   etcd.KeysAPI
+		ctx      context.Context
+		inflight *singleflight.Group
 	}
 )
 
-type Backend struct {
-	client   etcd.KeysAPI
-	ctx      context.Context
-	config   *Config
-	inflight *singleflight.Group
-}
-
-// NewBackend returns a new Backend.
-func NewBackend(client etcd.KeysAPI, ctx context.Context, config *Config) *Backend {
-	return &Backend{
+func NewEtcd(client etcd.KeysAPI, ctx context.Context) Etcd {
+	return Etcd{
 		client:   client,
 		ctx:      ctx,
-		config:   config,
 		inflight: &singleflight.Group{},
 	}
 }