feat: Update gpt4all, support multiple implementations in runtime

Signed-off-by: mudler <mudler@mocaccino.org>

api/api.go

@@ -66,6 +66,13 @@ func App(opts ...AppOption) (*fiber.App, error) {
 			log.Debug().Msgf("Model: %s (config: %+v)", v, cfg)
 		}
 	}
+
+	if options.assetsDestination != "" {
+		if err := PrepareBackendAssets(options.backendAssets, options.assetsDestination); err != nil {
+			log.Warn().Msgf("Failed extracting backend assets files: %s (might be required for some backends to work properly, like gpt4all)", err)
+		}
+	}
+
 	// Default middleware config
 	app.Use(recover.New())
 

api/backend_assets.go

@@ -0,0 +1,27 @@
+package api
+
+import (
+	"embed"
+	"os"
+	"path/filepath"
+
+	"github.com/go-skynet/LocalAI/pkg/assets"
+	"github.com/rs/zerolog/log"
+)
+
+func PrepareBackendAssets(backendAssets embed.FS, dst string) error {
+
+	// Extract files from the embedded FS
+	err := assets.ExtractFiles(backendAssets, dst)
+	if err != nil {
+		return err
+	}
+
+	// Set GPT4ALL libs where we extracted the files
+	// https://github.com/nomic-ai/gpt4all/commit/27e80e1d10985490c9fd4214e4bf458cfcf70896
+	gpt4alldir := filepath.Join(dst, "backend-assets", "gpt4all")
+	os.Setenv("GPT4ALL_IMPLEMENTATIONS_PATH", gpt4alldir)
+	log.Debug().Msgf("GPT4ALL_IMPLEMENTATIONS_PATH: %s", gpt4alldir)
+
+	return nil
+}

api/options.go

@@ -2,6 +2,7 @@ package api
 
 import (
 	"context"
+	"embed"
 
 	model "github.com/go-skynet/LocalAI/pkg/model"
 )
@@ -18,6 +19,9 @@ type Option struct {
 	preloadJSONModels               string
 	preloadModelsFromPath           string
 	corsAllowOrigins                string
+
+	backendAssets     embed.FS
+	assetsDestination string
 }
 
 type AppOption func(*Option)
@@ -49,6 +53,18 @@ func WithCorsAllowOrigins(b string) AppOption {
 	}
 }
 
+func WithBackendAssetsOutput(out string) AppOption {
+	return func(o *Option) {
+		o.assetsDestination = out
+	}
+}
+
+func WithBackendAssets(f embed.FS) AppOption {
+	return func(o *Option) {
+		o.backendAssets = f
+	}
+}
+
 func WithContext(ctx context.Context) AppOption {
 	return func(o *Option) {
 		o.context = ctx