chore(model-loader): increase test coverage of model loader (#3433)

chore(model-loader): increase coverage of model loader

Signed-off-by: Ettore Di Giacinto <mudler@localai.io>

pkg/model/loader.go

@@ -7,6 +7,7 @@ import (
 	"path/filepath"
 	"strings"
 	"sync"
+	"time"
 
 	"github.com/mudler/LocalAI/pkg/templates"
 
@@ -102,6 +103,18 @@ FILE:
 	return models, nil
 }
 
+func (ml *ModelLoader) ListModels() []*Model {
+	ml.mu.Lock()
+	defer ml.mu.Unlock()
+
+	models := []*Model{}
+	for _, model := range ml.models {
+		models = append(models, model)
+	}
+
+	return models
+}
+
 func (ml *ModelLoader) LoadModel(modelName string, loader func(string, string) (*Model, error)) (*Model, error) {
 	ml.mu.Lock()
 	defer ml.mu.Unlock()
@@ -120,7 +133,12 @@ func (ml *ModelLoader) LoadModel(modelName string, loader func(string, string) (
 		return nil, err
 	}
 
+	if model == nil {
+		return nil, fmt.Errorf("loader didn't return a model")
+	}
+
 	ml.models[modelName] = model
+
 	return model, nil
 }
 
@@ -146,11 +164,22 @@ func (ml *ModelLoader) CheckIsLoaded(s string) *Model {
 	}
 
 	log.Debug().Msgf("Model already loaded in memory: %s", s)
-	alive, err := m.GRPC(false, ml.wd).HealthCheck(context.Background())
+	client := m.GRPC(false, ml.wd)
+
+	log.Debug().Msgf("Checking model availability (%s)", s)
+	cTimeout, cancel := context.WithTimeout(context.Background(), 2*time.Minute)
+	defer cancel()
+
+	alive, err := client.HealthCheck(cTimeout)
 	if !alive {
 		log.Warn().Msgf("GRPC Model not responding: %s", err.Error())
 		log.Warn().Msgf("Deleting the process in order to recreate it")
-		if !ml.grpcProcesses[s].IsAlive() {
+		process, exists := ml.grpcProcesses[s]
+		if !exists {
+			log.Error().Msgf("Process not found for '%s' and the model is not responding anymore !", s)
+			return m
+		}
+		if !process.IsAlive() {
 			log.Debug().Msgf("GRPC Process is not responding: %s", s)
 			// stop and delete the process, this forces to re-load the model and re-create again the service
 			err := ml.deleteProcess(s)

pkg/model/loader_test.go

@@ -0,0 +1,105 @@
+package model_test
+
+import (
+	"errors"
+	"os"
+	"path/filepath"
+
+	"github.com/mudler/LocalAI/pkg/model"
+	. "github.com/onsi/ginkgo/v2"
+	. "github.com/onsi/gomega"
+)
+
+var _ = Describe("ModelLoader", func() {
+	var (
+		modelLoader *model.ModelLoader
+		modelPath   string
+		mockModel   *model.Model
+	)
+
+	BeforeEach(func() {
+		// Setup the model loader with a test directory
+		modelPath = "/tmp/test_model_path"
+		os.Mkdir(modelPath, 0755)
+		modelLoader = model.NewModelLoader(modelPath)
+	})
+
+	AfterEach(func() {
+		// Cleanup test directory
+		os.RemoveAll(modelPath)
+	})
+
+	Context("NewModelLoader", func() {
+		It("should create a new ModelLoader with an empty model map", func() {
+			Expect(modelLoader).ToNot(BeNil())
+			Expect(modelLoader.ModelPath).To(Equal(modelPath))
+			Expect(modelLoader.ListModels()).To(BeEmpty())
+		})
+	})
+
+	Context("ExistsInModelPath", func() {
+		It("should return true if a file exists in the model path", func() {
+			testFile := filepath.Join(modelPath, "test.model")
+			os.Create(testFile)
+			Expect(modelLoader.ExistsInModelPath("test.model")).To(BeTrue())
+		})
+
+		It("should return false if a file does not exist in the model path", func() {
+			Expect(modelLoader.ExistsInModelPath("nonexistent.model")).To(BeFalse())
+		})
+	})
+
+	Context("ListFilesInModelPath", func() {
+		It("should list all valid model files in the model path", func() {
+			os.Create(filepath.Join(modelPath, "test.model"))
+			os.Create(filepath.Join(modelPath, "README.md"))
+
+			files, err := modelLoader.ListFilesInModelPath()
+			Expect(err).To(BeNil())
+			Expect(files).To(ContainElement("test.model"))
+			Expect(files).ToNot(ContainElement("README.md"))
+		})
+	})
+
+	Context("LoadModel", func() {
+		It("should load a model and keep it in memory", func() {
+			mockModel = model.NewModel("test.model")
+
+			mockLoader := func(modelName, modelFile string) (*model.Model, error) {
+				return mockModel, nil
+			}
+
+			model, err := modelLoader.LoadModel("test.model", mockLoader)
+			Expect(err).To(BeNil())
+			Expect(model).To(Equal(mockModel))
+			Expect(modelLoader.CheckIsLoaded("test.model")).To(Equal(mockModel))
+		})
+
+		It("should return an error if loading the model fails", func() {
+			mockLoader := func(modelName, modelFile string) (*model.Model, error) {
+				return nil, errors.New("failed to load model")
+			}
+
+			model, err := modelLoader.LoadModel("test.model", mockLoader)
+			Expect(err).To(HaveOccurred())
+			Expect(model).To(BeNil())
+		})
+	})
+
+	Context("ShutdownModel", func() {
+		It("should shutdown a loaded model", func() {
+			mockModel = model.NewModel("test.model")
+
+			mockLoader := func(modelName, modelFile string) (*model.Model, error) {
+				return mockModel, nil
+			}
+
+			_, err := modelLoader.LoadModel("test.model", mockLoader)
+			Expect(err).To(BeNil())
+
+			err = modelLoader.ShutdownModel("test.model")
+			Expect(err).To(BeNil())
+			Expect(modelLoader.CheckIsLoaded("test.model")).To(BeNil())
+		})
+	})
+})

pkg/model/model.go

@@ -23,7 +23,6 @@ func (m *Model) GRPC(parallel bool, wd *WatchDog) grpc.Backend {
 		enableWD = true
 	}
 
-	client := grpc.NewClient(m.address, parallel, wd, enableWD)
+	m.client = grpc.NewClient(m.address, parallel, wd, enableWD)
-	m.client = client
+	return m.client
-	return client
 }