90 lines
1.7 KiB
Go
90 lines
1.7 KiB
Go
package erratic
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import (
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"fmt"
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"strconv"
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"time"
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"github.com/coredns/coredns/core/dnsserver"
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"github.com/coredns/coredns/middleware"
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"github.com/mholt/caddy"
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)
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func init() {
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caddy.RegisterPlugin("erratic", caddy.Plugin{
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ServerType: "dns",
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Action: setupErratic,
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})
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}
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func setupErratic(c *caddy.Controller) error {
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e, err := parseErratic(c)
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if err != nil {
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return middleware.Error("erratic", err)
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}
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dnsserver.GetConfig(c).AddMiddleware(func(next middleware.Handler) middleware.Handler {
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return e
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})
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return nil
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}
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func parseErratic(c *caddy.Controller) (*Erratic, error) {
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e := &Erratic{drop: 2}
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for c.Next() { // 'erratic'
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for c.NextBlock() {
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switch c.Val() {
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case "drop":
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args := c.RemainingArgs()
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if len(args) > 1 {
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return nil, c.ArgErr()
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}
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if len(args) == 0 {
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continue
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}
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amount, err := strconv.ParseInt(args[0], 10, 32)
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if err != nil {
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return nil, err
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}
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if amount < 0 {
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return nil, fmt.Errorf("illegal amount value given %q", args[0])
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}
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e.drop = uint64(amount)
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case "delay":
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args := c.RemainingArgs()
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if len(args) > 2 {
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return nil, c.ArgErr()
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}
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// Defaults.
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e.delay = 2
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e.duration = time.Duration(100 * time.Millisecond)
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if len(args) == 0 {
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continue
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}
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amount, err := strconv.ParseInt(args[0], 10, 32)
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if err != nil {
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return nil, err
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}
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if amount < 0 {
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return nil, fmt.Errorf("illegal amount value given %q", args[0])
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}
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e.delay = uint64(amount)
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if len(args) > 1 {
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duration, err := time.ParseDuration(args[1])
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if err != nil {
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return nil, err
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}
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e.duration = duration
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}
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}
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}
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}
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return e, nil
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}
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