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package setup
import (
"github.com/miekg/coredns/middleware"
"github.com/miekg/coredns/middleware/file"
"github.com/miekg/coredns/middleware/secondary"
)
// Secondary sets up the secondary middleware.
func Secondary(c *Controller) (middleware.Middleware, error) {
zones, err := secondaryParse(c)
if err != nil {
return nil, 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.Startup = append(c.Startup, func() error {
zones.Z[n].StartupOnce.Do(func() {
zones.Z[n].TransferIn()
go func() {
zones.Z[n].Update()
}()
})
return nil
})
}
}
return func(next middleware.Handler) middleware.Handler {
return secondary.Secondary{file.File{Next: next, Zones: zones}}
}, nil
}
func secondaryParse(c *Controller) (file.Zones, error) {
z := make(map[string]*file.Zone)
names := []string{}
for c.Next() {
if c.Val() == "secondary" {
// secondary [origin]
origins := []string{c.ServerBlockHosts[c.ServerBlockHostIndex]}
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])
names = append(names, origins[i])
}
for c.NextBlock() {
t, f, e := parseTransfer(c)
if e != nil {
return file.Zones{}, e
}
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...)
}
}
}
}
}
return file.Zones{Z: z, Names: names}, nil
}
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