middleware/proxy: implement Exchanger (#480)

By defining and using an proxy.Exchanger interface we make the proxy
more generic and we can then fold back httproxy into proxy.

This overrides #463 and #473 and should make futures extensions rather
trivial

* Add docs that talk about `protocol` and how to set it.
* middleware/proxy: rename New to NewLookup
  It's used as a Lookup mechanism not as a completely new proxy,
  reflect that in the name.
* Set maxfails to 3 by default when looking up names.

Most of the changes have been copied
from https://github.com/johnbelamaric/coredns/pull/1/files
This commit is contained in:
Miek Gieben 2017-01-15 08:12:58 +00:00 committed by GitHub
parent a6d232a622
commit 52e01264e8
25 changed files with 140 additions and 61 deletions

View file

@ -12,9 +12,9 @@ import (
"github.com/miekg/coredns/middleware/etcd/msg"
"github.com/miekg/coredns/middleware/pkg/dnsrecorder"
"github.com/miekg/coredns/middleware/pkg/singleflight"
"github.com/miekg/coredns/middleware/pkg/tls"
"github.com/miekg/coredns/middleware/proxy"
"github.com/miekg/coredns/middleware/test"
"github.com/miekg/coredns/middleware/pkg/tls"
etcdc "github.com/coreos/etcd/client"
"github.com/mholt/caddy"
@ -33,7 +33,7 @@ func newEtcdMiddleware() *Etcd {
client, _ := newEtcdClient(endpoints, tlsc)
return &Etcd{
Proxy: proxy.New([]string{"8.8.8.8:53"}),
Proxy: proxy.NewLookup([]string{"8.8.8.8:53"}),
PathPrefix: "skydns",
Ctx: context.Background(),
Inflight: &singleflight.Group{},