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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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8
middleware/etcd/setup.go
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@@ -49,7 +49,7 @@ func setup(c *caddy.Controller) error {
func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
stub := make(map[string]proxy.Proxy)
etc := Etcd{
Proxy: proxy.New([]string{"8.8.8.8:53", "8.8.4.4:53"}),
Proxy: proxy.NewLookup([]string{"8.8.8.8:53", "8.8.4.4:53"}),
PathPrefix: "skydns",
Ctx: context.Background(),
Inflight: &singleflight.Group{},
@@ -57,7 +57,7 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
}
var (
tlsConfig *tls.Config
err error
err error
endpoints = []string{defaultEndpoint}
stubzones = false
)
@@ -96,7 +96,7 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
if err != nil {
return &Etcd{}, false, err
}
etc.Proxy = proxy.New(ups)
etc.Proxy = proxy.NewLookup(ups)
case "tls": // cert key cacertfile
args := c.RemainingArgs()
tlsConfig, err = mwtls.NewTLSConfigFromArgs(args...)
@@ -134,7 +134,7 @@ func etcdParse(c *caddy.Controller) (*Etcd, bool, error) {
if err != nil {
return &Etcd{}, false, c.ArgErr()
}
etc.Proxy = proxy.New(ups)
etc.Proxy = proxy.NewLookup(ups)
case "tls": // cert key cacertfile
args := c.RemainingArgs()
tlsConfig, err = mwtls.NewTLSConfigFromArgs(args...)