Remove the word middleware (#1067)

* Rename middleware to plugin

first pass; mostly used 'sed', few spots where I manually changed
text.

This still builds a coredns binary.

* fmt error

* Rename AddMiddleware to AddPlugin

* Readd AddMiddleware to remain backwards compat

1 files changed, 0 insertions, 34 deletions

diff --git a/middleware/metrics/handler.go b/middleware/metrics/handler.go
deleted file mode 100644
index 50dc4141e..000000000
--- a/middleware/metrics/handler.go
+++ /dev/null
@@ -1,34 +0,0 @@
-package metrics
-
-import (
-	"github.com/coredns/coredns/middleware"
-	"github.com/coredns/coredns/middleware/metrics/vars"
-	"github.com/coredns/coredns/middleware/pkg/dnsrecorder"
-	"github.com/coredns/coredns/middleware/pkg/rcode"
-	"github.com/coredns/coredns/request"
-
-	"github.com/miekg/dns"
-	"golang.org/x/net/context"
-)
-
-// ServeDNS implements the Handler interface.
-func (m *Metrics) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
-	state := request.Request{W: w, Req: r}
-
-	qname := state.QName()
-	zone := middleware.Zones(m.ZoneNames()).Matches(qname)
-	if zone == "" {
-		zone = "."
-	}
-
-	// Record response to get status code and size of the reply.
-	rw := dnsrecorder.New(w)
-	status, err := middleware.NextOrFailure(m.Name(), m.Next, ctx, rw, r)
-
-	vars.Report(state, zone, rcode.ToString(rw.Rcode), rw.Len, rw.Start)
-
-	return status, err
-}
-
-// Name implements the Handler interface.
-func (m *Metrics) Name() string { return "prometheus" }