deploy: support for read affinity options per cluster

Implemented the capability to include read affinity options
for individual clusters within the ceph-csi-config ConfigMap.
This allows users to configure the crush location for each
cluster separately. The read affinity options specified in
the ConfigMap will supersede those provided via command line arguments.

Signed-off-by: Praveen M <m.praveen@ibm.com>

internal/util/csiconfig_test.go

@@ -365,3 +365,116 @@ func TestGetNFSNetNamespaceFilePath(t *testing.T) {
 		})
 	}
 }
+
+func TestGetReadAffinityOptions(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name      string
+		clusterID string
+		want      struct {
+			enabled bool
+			labels  string
+		}
+	}{
+		{
+			name:      "ReadAffinity enabled set to true for cluster-1",
+			clusterID: "cluster-1",
+			want: struct {
+				enabled bool
+				labels  string
+			}{true, "topology.kubernetes.io/region,topology.kubernetes.io/zone,topology.io/rack"},
+		},
+		{
+			name:      "ReadAffinity enabled set to true for cluster-2",
+			clusterID: "cluster-2",
+			want: struct {
+				enabled bool
+				labels  string
+			}{true, "topology.kubernetes.io/region"},
+		},
+		{
+			name:      "ReadAffinity enabled set to false for cluster-3",
+			clusterID: "cluster-3",
+			want: struct {
+				enabled bool
+				labels  string
+			}{false, ""},
+		},
+		{
+			name:      "ReadAffinity option not set in cluster-4",
+			clusterID: "cluster-4",
+			want: struct {
+				enabled bool
+				labels  string
+			}{false, ""},
+		},
+	}
+
+	csiConfig := []ClusterInfo{
+		{
+			ClusterID: "cluster-1",
+			ReadAffinity: struct {
+				Enabled             bool     `json:"enabled"`
+				CrushLocationLabels []string `json:"crushLocationLabels"`
+			}{
+				Enabled: true,
+				CrushLocationLabels: []string{
+					"topology.kubernetes.io/region",
+					"topology.kubernetes.io/zone",
+					"topology.io/rack",
+				},
+			},
+		},
+		{
+			ClusterID: "cluster-2",
+			ReadAffinity: struct {
+				Enabled             bool     `json:"enabled"`
+				CrushLocationLabels []string `json:"crushLocationLabels"`
+			}{
+				Enabled: true,
+				CrushLocationLabels: []string{
+					"topology.kubernetes.io/region",
+				},
+			},
+		},
+		{
+			ClusterID: "cluster-3",
+			ReadAffinity: struct {
+				Enabled             bool     `json:"enabled"`
+				CrushLocationLabels []string `json:"crushLocationLabels"`
+			}{
+				Enabled: false,
+				CrushLocationLabels: []string{
+					"topology.io/rack",
+				},
+			},
+		},
+		{
+			ClusterID: "cluster-4",
+		},
+	}
+	csiConfigFileContent, err := json.Marshal(csiConfig)
+	if err != nil {
+		t.Errorf("failed to marshal csi config info %v", err)
+	}
+	tmpConfPath := t.TempDir() + "/ceph-csi.json"
+	err = os.WriteFile(tmpConfPath, csiConfigFileContent, 0o600)
+	if err != nil {
+		t.Errorf("failed to write %s file content: %v", CsiConfigFile, err)
+	}
+	for _, tt := range tests {
+		tc := tt
+		t.Run(tc.name, func(t *testing.T) {
+			t.Parallel()
+			enabled, labels, err := GetCrushLocationLabels(tmpConfPath, tc.clusterID)
+			if err != nil {
+				t.Errorf("GetCrushLocationLabels() error = %v", err)
+
+				return
+			}
+			if enabled != tc.want.enabled || labels != tc.want.labels {
+				t.Errorf("GetCrushLocationLabels() = {%v %v} want %v", enabled, labels, tc.want)
+			}
+		})
+	}
+}