plugin/pprof - add option to enable block profiling (#2729)

* - add an option for block profiling to plugin pprof

* - move option block into nested block

plugin/pprof/setup.go

@@ -2,6 +2,7 @@ package pprof
 
 import (
 	"net"
+	"strconv"
 	"sync"
 
 	"github.com/coredns/coredns/plugin"
@@ -36,15 +37,34 @@ func setup(c *caddy.Controller) error {
 			h.addr = args[0]
 			_, _, e := net.SplitHostPort(h.addr)
 			if e != nil {
-				return e
+				return plugin.Error("pprof", c.Errf("%v", e))
 			}
 		}
+
 		if len(args) > 1 {
 			return plugin.Error("pprof", c.ArgErr())
 		}
-		if c.NextBlock() {
-			return plugin.Error("pprof", c.ArgErr())
+
+		for c.NextBlock() {
+			switch c.Val() {
+			case "block":
+				args := c.RemainingArgs()
+				if len(args) > 1 {
+					return plugin.Error("pprof", c.ArgErr())
+				}
+				h.rateBloc = 1
+				if len(args) > 0 {
+					t, err := strconv.Atoi(args[0])
+					if err != nil {
+						return plugin.Error("pprof", c.Errf("property '%s' invalid integer value '%v'", "block", args[0]))
+					}
+					h.rateBloc = t
+				}
+			default:
+				return plugin.Error("pprof", c.Errf("unknown property '%s'", c.Val()))
+			}
 		}
+
 	}
 
 	pprofOnce.Do(func() {