9c16ed1d14
* Default to upstream to self This is a backwards incompatible change. This is a massive (cleanup) PR where we default to resolving external names by the coredns process itself, instead of directly forwarding them to some upstream. This ignores any arguments `upstream` may have had and makes it depend on proxy/forward configuration in the Corefile. This allows resolved upstream names to be cached and we have better healthchecking of the upstreams. It also means there is only one way to resolve names, by either using the proxy or forward plugin. The proxy/forward lookup.go functions have been removed. This also lessen the dependency on proxy, meaning deprecating proxy will become easier. Some tests have been removed as well, or moved to the top-level test directory as they now require a full coredns process instead of just the plugin. For the etcd plugin, the entire StubZone resolving is *dropped*! This was a hacky (but working) solution to say the least. If someone cares deeply it can be brought back (maybe)? The pkg/upstream is now very small and almost does nothing. Also the New() function was changed to return a pointer to upstream.Upstream. It also returns only one parameter, so any stragglers using it will encounter a compile error. All documentation has been adapted. This affected the following plugins: * etcd * file * auto * secondary * federation * template * route53 A followup PR will make any upstream directives with arguments an error, right now they are ignored. Signed-off-by: Miek Gieben <miek@miek.nl> * Fix etcd build - probably still fails unit test Signed-off-by: Miek Gieben <miek@miek.nl> * Slightly smarter lookup check in upstream Signed-off-by: Miek Gieben <miek@miek.nl> * Compilez Signed-off-by: Miek Gieben <miek@miek.nl>
93 lines
1.8 KiB
Go
93 lines
1.8 KiB
Go
package federation
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"github.com/coredns/coredns/core/dnsserver"
|
|
"github.com/coredns/coredns/plugin"
|
|
"github.com/coredns/coredns/plugin/kubernetes"
|
|
"github.com/coredns/coredns/plugin/pkg/upstream"
|
|
"github.com/miekg/dns"
|
|
|
|
"github.com/mholt/caddy"
|
|
)
|
|
|
|
func init() {
|
|
caddy.RegisterPlugin("federation", caddy.Plugin{
|
|
ServerType: "dns",
|
|
Action: setup,
|
|
})
|
|
}
|
|
|
|
func setup(c *caddy.Controller) error {
|
|
fed, err := federationParse(c)
|
|
if err != nil {
|
|
return plugin.Error("federation", err)
|
|
}
|
|
|
|
// Do this in OnStartup, so all plugin has been initialized.
|
|
c.OnStartup(func() error {
|
|
m := dnsserver.GetConfig(c).Handler("kubernetes")
|
|
if m == nil {
|
|
return nil
|
|
}
|
|
if x, ok := m.(*kubernetes.Kubernetes); ok {
|
|
fed.Federations = x.Federations
|
|
}
|
|
return nil
|
|
})
|
|
|
|
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
|
|
fed.Next = next
|
|
return fed
|
|
})
|
|
|
|
return nil
|
|
}
|
|
|
|
func federationParse(c *caddy.Controller) (*Federation, error) {
|
|
fed := New()
|
|
|
|
for c.Next() {
|
|
// federation [zones..]
|
|
zones := c.RemainingArgs()
|
|
var origins []string
|
|
if len(zones) > 0 {
|
|
origins = make([]string, len(zones))
|
|
copy(origins, zones)
|
|
} else {
|
|
origins = make([]string, len(c.ServerBlockKeys))
|
|
copy(origins, c.ServerBlockKeys)
|
|
}
|
|
|
|
for c.NextBlock() {
|
|
x := c.Val()
|
|
switch x {
|
|
case "upstream":
|
|
c.RemainingArgs()
|
|
fed.Upstream = upstream.New()
|
|
default:
|
|
args := c.RemainingArgs()
|
|
if x := len(args); x != 1 {
|
|
return fed, fmt.Errorf("need two arguments for federation, got %d", x)
|
|
}
|
|
|
|
fed.f[x] = dns.Fqdn(args[0])
|
|
}
|
|
}
|
|
|
|
for i := range origins {
|
|
origins[i] = plugin.Host(origins[i]).Normalize()
|
|
}
|
|
|
|
fed.zones = origins
|
|
|
|
if len(fed.f) == 0 {
|
|
return fed, fmt.Errorf("at least one name to zone federation expected")
|
|
}
|
|
|
|
return fed, nil
|
|
}
|
|
|
|
return fed, nil
|
|
}
|