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middleware/proxy: implement Exchanger (#480)

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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
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2
middleware/file/cname_test.go
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@@ -93,7 +93,7 @@ func TestLookupCNAMEExternal(t *testing.T) {
if err != nil {
t.Fatalf("Expected no error when reading zone, got %q", err)
}
zone.Proxy = proxy.New([]string{"8.8.8.8:53"}) // TODO(miek): point to local instance
zone.Proxy = proxy.NewLookup([]string{"8.8.8.8:53"}) // TODO(miek): point to local instance
fm := File{Next: test.ErrorHandler(), Zones: Zones{Z: map[string]*Zone{name: zone}, Names: []string{name}}}
ctx := context.TODO()