chore(kontemplate): Prepare kontemplate for depot-merge

This merge will not yet include moving over to buildGo.nix, as support
for testing and such is not present in that library yet.

1 files changed, 35 insertions, 0 deletions

diff --git a/ops/kontemplate/templater/dns.go b/ops/kontemplate/templater/dns.go
new file mode 100644
index 000000000000..6cd974dd9324
--- /dev/null
+++ b/ops/kontemplate/templater/dns.go
@@ -0,0 +1,35 @@
+// Copyright (C) 2016-2019  Vincent Ambo <mail@tazj.in>
+//
+// This file is part of Kontemplate.
+//
+// Kontemplate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This file contains the implementation of a template function for retrieving
+// IP addresses from DNS
+
+package templater
+
+import (
+	"fmt"
+	"net"
+	"os"
+)
+
+func GetIPsFromDNS(host string) ([]interface{}, error) {
+	fmt.Fprintf(os.Stderr, "Attempting to look up IP for %s in DNS\n", host)
+	ips, err := net.LookupIP(host)
+
+	if err != nil {
+		return nil, fmt.Errorf("IP address lookup failed: %v", err)
+	}
+
+	var result []interface{} = make([]interface{}, len(ips))
+	for i, ip := range ips {
+		result[i] = ip
+	}
+
+	return result, nil
+}