Refactor device namer

Signed-off-by: Evan Lezar <elezar@nvidia.com>

pkg/nvcdi/full-gpu-nvml.go

@@ -39,7 +39,7 @@ func (l *nvmllib) GetGPUDeviceSpecs(i int, d device.Device) (*specs.Device, erro
 		return nil, fmt.Errorf("failed to get edits for device: %v", err)
 	}
 
-	name, err := l.deviceNamer.GetDeviceName(i, d)
+	name, err := l.deviceNamer.GetDeviceName(i, convert{d})
 	if err != nil {
 		return nil, fmt.Errorf("failed to get device name: %v", err)
 	}

pkg/nvcdi/mig-device-nvml.go

@@ -36,7 +36,7 @@ func (l *nvmllib) GetMIGDeviceSpecs(i int, d device.Device, j int, mig device.Mi
 		return nil, fmt.Errorf("failed to get edits for device: %v", err)
 	}
 
-	name, err := l.deviceNamer.GetMigDeviceName(i, d, j, mig)
+	name, err := l.deviceNamer.GetMigDeviceName(i, convert{d}, j, convert{mig})
 	if err != nil {
 		return nil, fmt.Errorf("failed to get device name: %v", err)
 	}

pkg/nvcdi/namer.go

@@ -17,16 +17,21 @@
 package nvcdi
 
 import (
+	"errors"
 	"fmt"
 
-	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvlib/device"
 	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvml"
 )
 
+// UUIDer is an interface for getting UUIDs.
+type UUIDer interface {
+	GetUUID() (string, error)
+}
+
 // DeviceNamer is an interface for getting device names
 type DeviceNamer interface {
-	GetDeviceName(int, device.Device) (string, error)
+	GetDeviceName(int, UUIDer) (string, error)
-	GetMigDeviceName(int, device.Device, int, device.MigDevice) (string, error)
+	GetMigDeviceName(int, UUIDer, int, UUIDer) (string, error)
 }
 
 // Supported device naming strategies
@@ -61,29 +66,57 @@ func NewDeviceNamer(strategy string) (DeviceNamer, error) {
 }
 
 // GetDeviceName returns the name for the specified device based on the naming strategy
-func (s deviceNameIndex) GetDeviceName(i int, d device.Device) (string, error) {
+func (s deviceNameIndex) GetDeviceName(i int, _ UUIDer) (string, error) {
 	return fmt.Sprintf("%s%d", s.gpuPrefix, i), nil
 }
 
 // GetMigDeviceName returns the name for the specified device based on the naming strategy
-func (s deviceNameIndex) GetMigDeviceName(i int, d device.Device, j int, mig device.MigDevice) (string, error) {
+func (s deviceNameIndex) GetMigDeviceName(i int, _ UUIDer, j int, _ UUIDer) (string, error) {
 	return fmt.Sprintf("%s%d:%d", s.migPrefix, i, j), nil
 }
 
 // GetDeviceName returns the name for the specified device based on the naming strategy
-func (s deviceNameUUID) GetDeviceName(i int, d device.Device) (string, error) {
+func (s deviceNameUUID) GetDeviceName(i int, d UUIDer) (string, error) {
-	uuid, ret := d.GetUUID()
+	uuid, err := d.GetUUID()
-	if ret != nvml.SUCCESS {
+	if err != nil {
-		return "", fmt.Errorf("failed to get device UUID: %v", ret)
+		return "", fmt.Errorf("failed to get device UUID: %v", err)
 	}
 	return uuid, nil
 }
 
 // GetMigDeviceName returns the name for the specified device based on the naming strategy
-func (s deviceNameUUID) GetMigDeviceName(i int, d device.Device, j int, mig device.MigDevice) (string, error) {
+func (s deviceNameUUID) GetMigDeviceName(i int, _ UUIDer, j int, mig UUIDer) (string, error) {
-	uuid, ret := mig.GetUUID()
+	uuid, err := mig.GetUUID()
-	if ret != nvml.SUCCESS {
+	if err != nil {
-		return "", fmt.Errorf("failed to get device UUID: %v", ret)
+		return "", fmt.Errorf("failed to get device UUID: %v", err)
 	}
 	return uuid, nil
 }
+
+//go:generate moq -stub -out namer_nvml_mock.go . nvmlUUIDer
+type nvmlUUIDer interface {
+	GetUUID() (string, nvml.Return)
+}
+
+type convert struct {
+	nvmlUUIDer
+}
+
+type uuidUnsupported struct{}
+
+func (m convert) GetUUID() (string, error) {
+	if m.nvmlUUIDer == nil {
+		return uuidUnsupported{}.GetUUID()
+	}
+	uuid, ret := m.nvmlUUIDer.GetUUID()
+	if ret != nvml.SUCCESS {
+		return "", ret
+	}
+	return uuid, nil
+}
+
+var errUUIDUnsupported = errors.New("GetUUID is not supported")
+
+func (m uuidUnsupported) GetUUID() (string, error) {
+	return "", errUUIDUnsupported
+}

pkg/nvcdi/namer_nvml_mock.go

@@ -0,0 +1,72 @@
+// Code generated by moq; DO NOT EDIT.
+// github.com/matryer/moq
+
+package nvcdi
+
+import (
+	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvml"
+	"sync"
+)
+
+// Ensure, that nvmlUUIDerMock does implement nvmlUUIDer.
+// If this is not the case, regenerate this file with moq.
+var _ nvmlUUIDer = &nvmlUUIDerMock{}
+
+// nvmlUUIDerMock is a mock implementation of nvmlUUIDer.
+//
+//	func TestSomethingThatUsesnvmlUUIDer(t *testing.T) {
+//
+//		// make and configure a mocked nvmlUUIDer
+//		mockednvmlUUIDer := &nvmlUUIDerMock{
+//			GetUUIDFunc: func() (string, nvml.Return) {
+//				panic("mock out the GetUUID method")
+//			},
+//		}
+//
+//		// use mockednvmlUUIDer in code that requires nvmlUUIDer
+//		// and then make assertions.
+//
+//	}
+type nvmlUUIDerMock struct {
+	// GetUUIDFunc mocks the GetUUID method.
+	GetUUIDFunc func() (string, nvml.Return)
+
+	// calls tracks calls to the methods.
+	calls struct {
+		// GetUUID holds details about calls to the GetUUID method.
+		GetUUID []struct {
+		}
+	}
+	lockGetUUID sync.RWMutex
+}
+
+// GetUUID calls GetUUIDFunc.
+func (mock *nvmlUUIDerMock) GetUUID() (string, nvml.Return) {
+	callInfo := struct {
+	}{}
+	mock.lockGetUUID.Lock()
+	mock.calls.GetUUID = append(mock.calls.GetUUID, callInfo)
+	mock.lockGetUUID.Unlock()
+	if mock.GetUUIDFunc == nil {
+		var (
+			sOut      string
+			returnOut nvml.Return
+		)
+		return sOut, returnOut
+	}
+	return mock.GetUUIDFunc()
+}
+
+// GetUUIDCalls gets all the calls that were made to GetUUID.
+// Check the length with:
+//
+//	len(mockednvmlUUIDer.GetUUIDCalls())
+func (mock *nvmlUUIDerMock) GetUUIDCalls() []struct {
+} {
+	var calls []struct {
+	}
+	mock.lockGetUUID.RLock()
+	calls = mock.calls.GetUUID
+	mock.lockGetUUID.RUnlock()
+	return calls
+}

pkg/nvcdi/namer_test.go

@@ -0,0 +1,67 @@
+/**
+# Copyright (c) NVIDIA CORPORATION.  All rights reserved.
+#
+# 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 nvcdi
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"gitlab.com/nvidia/cloud-native/go-nvlib/pkg/nvml"
+)
+
+func TestConvert(t *testing.T) {
+	testCases := []struct {
+		description   string
+		nvml          nvmlUUIDer
+		expectedError error
+		expecteUUID   string
+	}{
+		{
+			description:   "empty UUIDer returns error",
+			expectedError: errUUIDUnsupported,
+			expecteUUID:   "",
+		},
+		{
+			description: "nvmlUUIDer returns UUID",
+			nvml: &nvmlUUIDerMock{
+				GetUUIDFunc: func() (string, nvml.Return) {
+					return "SOME_UUID", nvml.SUCCESS
+				},
+			},
+			expectedError: nil,
+			expecteUUID:   "SOME_UUID",
+		},
+		{
+			description: "nvmlUUIDer returns error",
+			nvml: &nvmlUUIDerMock{
+				GetUUIDFunc: func() (string, nvml.Return) {
+					return "SOME_UUID", nvml.ERROR_UNKNOWN
+				},
+			},
+			expectedError: nvml.ERROR_UNKNOWN,
+			expecteUUID:   "",
+		},
+	}
+
+	for _, tc := range testCases {
+		t.Run(tc.description, func(t *testing.T) {
+			uuid, err := convert{tc.nvml}.GetUUID()
+			require.ErrorIs(t, err, tc.expectedError)
+			require.Equal(t, tc.expecteUUID, uuid)
+		})
+	}
+}