Add RandData template function

clusterloader2/pkg/config/template_functions.go

@@ -57,6 +57,7 @@ func GetFuncs(fsys fs.FS) template.FuncMap {
 		"Mod":              mod,
 		"MultiplyFloat":    multiplyFloat,
 		"MultiplyInt":      multiplyInt,
+		"RandData":         randData,
 		"RandInt":          randInt,
 		"RandIntRange":     randIntRange,
 		"Seq":              seq,
@@ -101,6 +102,17 @@ func toFloat64(val interface{}) float64 {
 	panic(fmt.Sprintf("cannot cast %v to float64", val))
 }
 
+// randData returns pseudo-random string of i length.
+func randData(i interface{}) string {
+	const alphabet = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+	typedI := int(toFloat64(i))
+	b := make([]byte, typedI)
+	for i := range b {
+		b[i] = alphabet[rand.Intn(len(alphabet))]
+	}
+	return string(b)
+}
+
 // randInt returns pseudo-random int in [0, i].
 func randInt(i interface{}) int {
 	typedI := int(toFloat64(i))

clusterloader2/pkg/config/template_functions_test.go

@@ -0,0 +1,41 @@
+/*
+Copyright 2023 The Kubernetes 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 config
+
+import (
+	"testing"
+)
+
+func TestTemplateRandData(t *testing.T) {
+	tests := []struct {
+		length int
+	}{
+		{
+			length: 1,
+		},
+		{
+			length: 100,
+		},
+	}
+
+	for _, tt := range tests {
+		data := randData(tt.length)
+		if tt.length != len(data) {
+			t.Errorf("wanted: %d, got: %d", tt.length, len(data))
+		}
+	}
+}