Initial revision

exporter/mezmoexporter/utils.go

@@ -0,0 +1,37 @@
+// Copyright  The OpenTelemetry 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 mezmoexporter
+
+import "math/rand"
+
+// truncateString Truncates the given string to a maximum length provided by max.
+func truncateString(s string, max int) string {
+	if len(s) < max {
+		return s
+	}
+
+	return s[:max]
+}
+
+const letters = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+// randString Returns a random string of the specified length.
+func randString(n int) string {
+	b := make([]byte, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}

exporter/mezmoexporter/utils_test.go

@@ -0,0 +1,56 @@
+// Copyright  The OpenTelemetry 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 mezmoexporter
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestTruncateString(t *testing.T) {
+	t.Run("Test empty string", func(t *testing.T) {
+		s := truncateString("", 10)
+		require.Len(t, s, 0)
+	})
+
+	// Test string is less than the maximum length
+	t.Run("Test shorter string", func(t *testing.T) {
+		s := truncateString("short", 10)
+		require.Len(t, s, 5)
+		require.Equal(t, s, "short")
+	})
+
+	// Test string is equal to the maximum length
+	t.Run("Test equal string", func(t *testing.T) {
+		s := truncateString("short", 5)
+		require.Len(t, s, 5)
+		require.Equal(t, s, "short")
+	})
+
+	// Test string is longer than the maximum length
+	t.Run("Test longer string", func(t *testing.T) {
+		s := truncateString("longstring", 4)
+		require.Len(t, s, 4)
+		require.Equal(t, s, "long")
+	})
+}
+
+func TestRandString(t *testing.T) {
+	t.Run("Test fixed length string", func(t *testing.T) {
+		var s = randString(16 * 1024)
+		require.Len(t, s, 16*1024)
+	})
+}