feat: add endpoint to list system informations (#3449)

* feat: add endpoint to list system informations

For now, it lists the available backends, but can be expanded later on
to include more system informations (such as GPU devices detected, RAM,
threads configured, and so on so forth).

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

* show also external backends

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

* add test

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

---------

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

core/http/app_test.go

@@ -772,6 +772,17 @@ var _ = Describe("API test", func() {
 			Expect(err.Error()).To(ContainSubstring("error, status code: 500, message: could not load model - all backends returned error:"))
 		})
 
+		It("shows the external backend", func() {
+			// do an http request to the /system endpoint
+			resp, err := http.Get("http://127.0.0.1:9090/system")
+			Expect(err).ToNot(HaveOccurred())
+			Expect(resp.StatusCode).To(Equal(200))
+			dat, err := io.ReadAll(resp.Body)
+			Expect(err).ToNot(HaveOccurred())
+			Expect(string(dat)).To(ContainSubstring("huggingface"))
+			Expect(string(dat)).To(ContainSubstring("llama-cpp"))
+		})
+
 		It("transcribes audio", func() {
 			if runtime.GOOS != "linux" {
 				Skip("test supported only on linux")

core/http/endpoints/localai/system.go

@@ -0,0 +1,29 @@
+package localai
+
+import (
+	"github.com/gofiber/fiber/v2"
+	"github.com/mudler/LocalAI/core/config"
+	"github.com/mudler/LocalAI/core/schema"
+	"github.com/mudler/LocalAI/pkg/model"
+)
+
+// SystemInformations returns the system informations
+// @Summary Show the LocalAI instance information
+// @Success 200 {object} schema.SystemInformationResponse "Response"
+// @Router /system [get]
+func SystemInformations(ml *model.ModelLoader, appConfig *config.ApplicationConfig) func(*fiber.Ctx) error {
+	return func(c *fiber.Ctx) error {
+		availableBackends, err := ml.ListAvailableBackends(appConfig.AssetsDestination)
+		if err != nil {
+			return err
+		}
+		for b := range appConfig.ExternalGRPCBackends {
+			availableBackends = append(availableBackends, b)
+		}
+		return c.JSON(
+			schema.SystemInformationResponse{
+				Backends: availableBackends,
+			},
+		)
+	}
+}

core/http/routes/localai.go

@@ -70,4 +70,6 @@ func RegisterLocalAIRoutes(app *fiber.App,
 		}{Version: internal.PrintableVersion()})
 	})
 
+	app.Get("/system", auth, localai.SystemInformations(ml, appConfig))
+
 }

core/schema/localai.go

@@ -70,3 +70,7 @@ type P2PNodesResponse struct {
 	Nodes          []p2p.NodeData `json:"nodes" yaml:"nodes"`
 	FederatedNodes []p2p.NodeData `json:"federated_nodes" yaml:"federated_nodes"`
 }
+
+type SystemInformationResponse struct {
+	Backends []string `json:"backends"`
+}

pkg/model/initializers.go

@@ -393,6 +393,10 @@ func (ml *ModelLoader) grpcModel(backend string, o *Options) func(string, string
 	}
 }
 
+func (ml *ModelLoader) ListAvailableBackends(assetdir string) ([]string, error) {
+	return backendsInAssetDir(assetdir)
+}
+
 func (ml *ModelLoader) BackendLoader(opts ...Option) (client grpc.Backend, err error) {
 	o := NewOptions(opts...)