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|
package cache
import (
"fmt"
"strconv"
"time"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/middleware"
"github.com/hashicorp/golang-lru"
"github.com/mholt/caddy"
)
func init() {
caddy.RegisterPlugin("cache", caddy.Plugin{
ServerType: "dns",
Action: setup,
})
}
func setup(c *caddy.Controller) error {
ca, err := cacheParse(c)
if err != nil {
return middleware.Error("cache", err)
}
dnsserver.GetConfig(c).AddMiddleware(func(next middleware.Handler) middleware.Handler {
ca.Next = next
return ca
})
// Export the capacity for the metrics. This only happens once, because this is a re-load change only.
cacheCapacity.WithLabelValues(Success).Set(float64(ca.pcap))
cacheCapacity.WithLabelValues(Denial).Set(float64(ca.ncap))
return nil
}
func cacheParse(c *caddy.Controller) (*Cache, error) {
ca := &Cache{pcap: defaultCap, ncap: defaultCap, pttl: maxTTL, nttl: maxNTTL}
for c.Next() {
// cache [ttl] [zones..]
origins := make([]string, len(c.ServerBlockKeys))
copy(origins, c.ServerBlockKeys)
args := c.RemainingArgs()
if len(args) > 0 {
// first args may be just a number, then it is the ttl, if not it is a zone
ttl, err := strconv.Atoi(args[0])
if err == nil {
// Reserve 0 (and smaller for future things)
if ttl <= 0 {
return nil, fmt.Errorf("cache TTL can not be zero or negative: %d", ttl)
}
ca.pttl = time.Duration(ttl) * time.Second
ca.nttl = time.Duration(ttl) * time.Second
args = args[1:]
}
if len(args) > 0 {
copy(origins, args)
}
}
// Refinements? In an extra block.
for c.NextBlock() {
switch c.Val() {
// first number is cap, second is an new ttl
case Success:
args := c.RemainingArgs()
if len(args) == 0 {
return nil, c.ArgErr()
}
pcap, err := strconv.Atoi(args[0])
if err != nil {
return nil, err
}
ca.pcap = pcap
if len(args) > 1 {
pttl, err := strconv.Atoi(args[1])
if err != nil {
return nil, err
}
// Reserve 0 (and smaller for future things)
if pttl <= 0 {
return nil, fmt.Errorf("cache TTL can not be zero or negative: %d", pttl)
}
ca.pttl = time.Duration(pttl) * time.Second
}
case Denial:
args := c.RemainingArgs()
if len(args) == 0 {
return nil, c.ArgErr()
}
ncap, err := strconv.Atoi(args[0])
if err != nil {
return nil, err
}
ca.ncap = ncap
if len(args) > 1 {
nttl, err := strconv.Atoi(args[1])
if err != nil {
return nil, err
}
// Reserve 0 (and smaller for future things)
if nttl <= 0 {
return nil, fmt.Errorf("cache TTL can not be zero or negative: %d", nttl)
}
ca.nttl = time.Duration(nttl) * time.Second
}
default:
return nil, c.ArgErr()
}
}
for i := range origins {
origins[i] = middleware.Host(origins[i]).Normalize()
}
var err error
ca.Zones = origins
ca.pcache, err = lru.New(ca.pcap)
if err != nil {
return nil, err
}
ca.ncache, err = lru.New(ca.ncap)
if err != nil {
return nil, err
}
return ca, nil
}
return nil, nil
}
|
