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|
package cache
import (
"fmt"
"strconv"
"time"
"github.com/coredns/coredns/core/dnsserver"
"github.com/coredns/coredns/plugin"
"github.com/coredns/coredns/plugin/metrics"
"github.com/coredns/coredns/plugin/pkg/cache"
clog "github.com/coredns/coredns/plugin/pkg/log"
"github.com/mholt/caddy"
)
var log = clog.NewWithPlugin("cache")
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 plugin.Error("cache", err)
}
dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
ca.Next = next
return ca
})
c.OnStartup(func() error {
metrics.MustRegister(c,
cacheSize, cacheHits, cacheMisses,
cachePrefetches, cacheDrops)
return nil
})
return nil
}
func cacheParse(c *caddy.Controller) (*Cache, error) {
ca := New()
j := 0
for c.Next() {
if j > 0 {
return nil, plugin.ErrOnce
}
j++
// 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
if len(args) > 2 {
minpttl, err := strconv.Atoi(args[2])
if err != nil {
return nil, err
}
// Reserve < 0
if minpttl < 0 {
return nil, fmt.Errorf("cache min TTL can not be negative: %d", minpttl)
}
ca.minpttl = time.Duration(minpttl) * 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
if len(args) > 2 {
minnttl, err := strconv.Atoi(args[2])
if err != nil {
return nil, err
}
// Reserve < 0
if minnttl < 0 {
return nil, fmt.Errorf("cache min TTL can not be negative: %d", minnttl)
}
ca.minnttl = time.Duration(minnttl) * time.Second
}
}
case "prefetch":
args := c.RemainingArgs()
if len(args) == 0 || len(args) > 3 {
return nil, c.ArgErr()
}
amount, err := strconv.Atoi(args[0])
if err != nil {
return nil, err
}
if amount < 0 {
return nil, fmt.Errorf("prefetch amount should be positive: %d", amount)
}
ca.prefetch = amount
if len(args) > 1 {
dur, err := time.ParseDuration(args[1])
if err != nil {
return nil, err
}
ca.duration = dur
}
if len(args) > 2 {
pct := args[2]
if x := pct[len(pct)-1]; x != '%' {
return nil, fmt.Errorf("last character of percentage should be `%%`, but is: %q", x)
}
pct = pct[:len(pct)-1]
num, err := strconv.Atoi(pct)
if err != nil {
return nil, err
}
if num < 10 || num > 90 {
return nil, fmt.Errorf("percentage should fall in range [10, 90]: %d", num)
}
ca.percentage = num
}
default:
return nil, c.ArgErr()
}
}
for i := range origins {
origins[i] = plugin.Host(origins[i]).Normalize()
}
ca.Zones = origins
ca.pcache = cache.New(ca.pcap)
ca.ncache = cache.New(ca.ncap)
}
return ca, nil
}
|
