v0.59.0 release (#219)

CHANGELOG.md

@@ -4,7 +4,7 @@
 
 ## 0.59.0 (2022/03/26)
 
-* [FEATURE] Improve k8s compatibility. [#219](https://github.com/ortuman/jackal/pull/219), [#220](https://github.com/ortuman/jackal/pull/220), 
+* [FEATURE] Improve k8s compatibility. [#219](https://github.com/ortuman/jackal/pull/219), [#220](https://github.com/ortuman/jackal/pull/220),
 
 ## 0.58.0 (2022/03/04)
 

pkg/util/net/net.go

@@ -0,0 +1,42 @@
+// Copyright 2022 The jackal Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package net
+
+import (
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+)
+
+// SRVResolve performs SRV resolution over dns.
+func SRVResolve(service, proto, remoteAddr string) ([]string, error) {
+	var retVal []string
+
+	_, addrs, err := net.LookupSRV(service, proto, remoteAddr)
+	if err != nil {
+		return nil, err
+	}
+	for _, addr := range addrs {
+		if addr.Target == "." {
+			continue
+		}
+		host := strings.TrimSuffix(addr.Target, ".")
+		port := strconv.Itoa(int(addr.Port))
+
+		retVal = append(retVal, fmt.Sprintf("%s:%s", host, port))
+	}
+	return retVal, nil
+}