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Add etcd middleware

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This middleware acts in the same way as SkyDNS. We might add options
to allow it to be behave different, but for now it will suffice.

A Corefile like:
.:1053 {
    etcd miek.nl
    proxy . 8.8.8.8:53
}
will perform lookup in etcd and proxy everything not miek.nl to Google
for further resolution.

The internal etcd forwarding *also* uses the proxy infrastructure,
meaning you get health check and such for (almost) free
This commit is contained in:
Miek Gieben
2016-03-20 17:44:58 +00:00
parent 15518b5b6f
commit 8f9f2cd1ab
19 changed files with 1575 additions and 8 deletions
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2
middleware/exchange.go
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@@ -2,8 +2,6 @@ package middleware
import "github.com/miekg/dns"
// Exchang sends message m to the server.
// TODO(miek): optionally it can do retries of other silly stuff.
func Exchange(c *dns.Client, m *dns.Msg, server string) (*dns.Msg, error) {
r, _, err := c.Exchange(m, server)
return r, err