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setup.go
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setup.go
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package secondary
import (
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/middleware"
"github.com/coredns/coredns/middleware/file"
"github.com/coredns/coredns/middleware/pkg/dnsutil"
"github.com/coredns/coredns/middleware/proxy"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("secondary", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
zones, err := secondaryParse(c)
if err != nil {
return middleware.Error("secondary", err)
}
// Add startup functions to retrieve the zone and keep it up to date.
for _, n := range zones.Names {
if len(zones.Z[n].TransferFrom) > 0 {
c.OnStartup(func() error {
zones.Z[n].StartupOnce.Do(func() {
zones.Z[n].TransferIn()
go func() {
zones.Z[n].Update()
}()
})
return nil
})
}
}
dnsserver.GetConfig(c).AddMiddleware(func(next middleware.Handler) middleware.Handler {
return Secondary{file.File{Next: next, Zones: zones}}
})
return nil
}
func secondaryParse(c *caddy.Controller) (file.Zones, error) {
z := make(map[string]*file.Zone)
names := []string{}
origins := []string{}
prxy := proxy.Proxy{}
for c.Next() {
if c.Val() == "secondary" {
// secondary [origin]
origins = make([]string, len(c.ServerBlockKeys))
copy(origins, c.ServerBlockKeys)
args := c.RemainingArgs()
if len(args) > 0 {
origins = args
}
for i := range origins {
origins[i] = middleware.Host(origins[i]).Normalize()
z[origins[i]] = file.NewZone(origins[i], "stdin")
names = append(names, origins[i])
}
for c.NextBlock() {
t, f := []string{}, []string{}
var e error
switch c.Val() {
case "transfer":
t, f, e = file.TransferParse(c, true)
if e != nil {
return file.Zones{}, e
}
case "upstream":
args := c.RemainingArgs()
if len(args) == 0 {
return file.Zones{}, c.ArgErr()
}
ups, err := dnsutil.ParseHostPortOrFile(args...)
if err != nil {
return file.Zones{}, err
}
prxy = proxy.NewLookup(ups)
}
for _, origin := range origins {
if t != nil {
z[origin].TransferTo = append(z[origin].TransferTo, t...)
}
if f != nil {
z[origin].TransferFrom = append(z[origin].TransferFrom, f...)
}
z[origin].Proxy = prxy
}
}
}
}
return file.Zones{Z: z, Names: names}, nil
}