plugin/timeouts - Allow ability to configure listening server timeouts (#5784)

plugin/timeouts/timeouts.go

@@ -0,0 +1,69 @@
+package timeouts
+
+import (
+	"time"
+
+	"github.com/coredns/caddy"
+	"github.com/coredns/coredns/core/dnsserver"
+	"github.com/coredns/coredns/plugin"
+	"github.com/coredns/coredns/plugin/pkg/durations"
+)
+
+func init() { plugin.Register("timeouts", setup) }
+
+func setup(c *caddy.Controller) error {
+	err := parseTimeouts(c)
+	if err != nil {
+		return plugin.Error("timeouts", err)
+	}
+	return nil
+}
+
+func parseTimeouts(c *caddy.Controller) error {
+	config := dnsserver.GetConfig(c)
+
+	for c.Next() {
+		args := c.RemainingArgs()
+		if len(args) > 0 {
+			return plugin.Error("timeouts", c.ArgErr())
+		}
+
+		b := 0
+		for c.NextBlock() {
+			block := c.Val()
+			timeoutArgs := c.RemainingArgs()
+			if len(timeoutArgs) != 1 {
+				return c.ArgErr()
+			}
+
+			timeout, err := durations.NewDurationFromArg(timeoutArgs[0])
+			if err != nil {
+				return c.Err(err.Error())
+			}
+
+			if timeout < (1*time.Second) || timeout > (24*time.Hour) {
+				return c.Errf("timeout provided '%s' needs to be between 1 second and 24 hours", timeout)
+			}
+
+			switch block {
+			case "read":
+				config.ReadTimeout = timeout
+
+			case "write":
+				config.WriteTimeout = timeout
+
+			case "idle":
+				config.IdleTimeout = timeout
+
+			default:
+				return c.Errf("unknown option: '%s'", block)
+			}
+			b++
+		}
+
+		if b == 0 {
+			return plugin.Error("timeouts", c.Err("timeouts block with no timeouts specified"))
+		}
+	}
+	return nil
+}