clear ipv6 address in lookupd lookup api

nsqlookupd/http.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"net/http"
 	"net/http/pprof"
+	"strings"
 	"sync/atomic"
 
 	"github.com/julienschmidt/httprouter"
@@ -121,6 +122,14 @@ func (s *httpServer) doLookup(w http.ResponseWriter, req *http.Request, ps httpr
 	producers := s.ctx.nsqlookupd.DB.FindProducers("topic", topicName, "")
 	producers = producers.FilterByActive(s.ctx.nsqlookupd.opts.InactiveProducerTimeout,
 		s.ctx.nsqlookupd.opts.TombstoneLifetime)
+
+	for _, producer := range producers {
+		// Assume it is an ipv6 address if a colon is in it
+		if strings.Contains(producer.peerInfo.BroadcastAddress, ":") {
+			producer.peerInfo.BroadcastAddress = strings.TrimPrefix(producer.peerInfo.BroadcastAddress, "[")
+			producer.peerInfo.BroadcastAddress = strings.TrimSuffix(producer.peerInfo.BroadcastAddress, "]")
+		}
+	}
 	return map[string]interface{}{
 		"channels":  channels,
 		"producers": producers.PeerInfo(),