Add req-ID to logging

with this log format we can easily identify
the logs per request

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

pkg/csi-common/utils_test.go

@@ -0,0 +1,71 @@
+/*
+Copyright 2019 ceph-csi 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 csicommon
+
+import (
+	"testing"
+
+	"github.com/container-storage-interface/spec/lib/go/csi"
+)
+
+var fakeID = "fake-id"
+
+func TestGetReqID(t *testing.T) {
+	req := []interface{}{
+		&csi.CreateVolumeRequest{
+			Name: fakeID,
+		},
+		&csi.DeleteVolumeRequest{
+			VolumeId: fakeID,
+		},
+		&csi.CreateSnapshotRequest{
+			Name: fakeID,
+		},
+		&csi.DeleteSnapshotRequest{
+			SnapshotId: fakeID,
+		},
+
+		&csi.ControllerExpandVolumeRequest{
+			VolumeId: fakeID,
+		},
+		&csi.NodeStageVolumeRequest{
+			VolumeId: fakeID,
+		},
+		&csi.NodeUnstageVolumeRequest{
+			VolumeId: fakeID,
+		},
+		&csi.NodePublishVolumeRequest{
+			VolumeId: fakeID,
+		},
+		&csi.NodeUnpublishVolumeRequest{
+			VolumeId: fakeID,
+		},
+		&csi.NodeExpandVolumeRequest{
+			VolumeId: fakeID,
+		},
+	}
+	for _, r := range req {
+		if got := getReqID(r); got != fakeID {
+			t.Errorf("getReqID() = %v, want %v", got, fakeID)
+		}
+	}
+
+	// test for nil request
+	if got := getReqID(nil); got != "" {
+		t.Errorf("getReqID() = %v, want empty string", got)
+	}
+}