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Diffstat (limited to 'plugin/erratic/setup.go')
-rw-r--r--plugin/erratic/setup.go117
1 files changed, 117 insertions, 0 deletions
diff --git a/plugin/erratic/setup.go b/plugin/erratic/setup.go
new file mode 100644
index 000000000..b0a56927d
--- /dev/null
+++ b/plugin/erratic/setup.go
@@ -0,0 +1,117 @@
+package erratic
+
+import (
+ "fmt"
+ "strconv"
+ "time"
+
+ "github.com/coredns/coredns/core/dnsserver"
+ "github.com/coredns/coredns/plugin"
+
+ "github.com/mholt/caddy"
+)
+
+func init() {
+ caddy.RegisterPlugin("erratic", caddy.Plugin{
+ ServerType: "dns",
+ Action: setupErratic,
+ })
+}
+
+func setupErratic(c *caddy.Controller) error {
+ e, err := parseErratic(c)
+ if err != nil {
+ return plugin.Error("erratic", err)
+ }
+
+ dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
+ return e
+ })
+
+ return nil
+}
+
+func parseErratic(c *caddy.Controller) (*Erratic, error) {
+ e := &Erratic{drop: 2}
+ drop := false // true if we've seen the drop keyword
+
+ for c.Next() { // 'erratic'
+ for c.NextBlock() {
+ switch c.Val() {
+ case "drop":
+ args := c.RemainingArgs()
+ if len(args) > 1 {
+ return nil, c.ArgErr()
+ }
+
+ if len(args) == 0 {
+ continue
+ }
+
+ amount, err := strconv.ParseInt(args[0], 10, 32)
+ if err != nil {
+ return nil, err
+ }
+ if amount < 0 {
+ return nil, fmt.Errorf("illegal amount value given %q", args[0])
+ }
+ e.drop = uint64(amount)
+ drop = true
+ case "delay":
+ args := c.RemainingArgs()
+ if len(args) > 2 {
+ return nil, c.ArgErr()
+ }
+
+ // Defaults.
+ e.delay = 2
+ e.duration = 100 * time.Millisecond
+ if len(args) == 0 {
+ continue
+ }
+
+ amount, err := strconv.ParseInt(args[0], 10, 32)
+ if err != nil {
+ return nil, err
+ }
+ if amount < 0 {
+ return nil, fmt.Errorf("illegal amount value given %q", args[0])
+ }
+ e.delay = uint64(amount)
+
+ if len(args) > 1 {
+ duration, err := time.ParseDuration(args[1])
+ if err != nil {
+ return nil, err
+ }
+ e.duration = duration
+ }
+ case "truncate":
+ args := c.RemainingArgs()
+ if len(args) > 1 {
+ return nil, c.ArgErr()
+ }
+
+ if len(args) == 0 {
+ continue
+ }
+
+ amount, err := strconv.ParseInt(args[0], 10, 32)
+ if err != nil {
+ return nil, err
+ }
+ if amount < 0 {
+ return nil, fmt.Errorf("illegal amount value given %q", args[0])
+ }
+ e.truncate = uint64(amount)
+ default:
+ return nil, c.Errf("unknown property '%s'", c.Val())
+ }
+ }
+ }
+ if (e.delay > 0 || e.truncate > 0) && !drop { // delay is set, but we've haven't seen a drop keyword, remove default drop stuff
+ e.drop = 0
+ }
+
+ return e, nil
+}