Scan model once as start, then only if changed.

ui/server.py

@@ -7,7 +7,6 @@ import traceback
 
 import sys
 import os
-import picklescan.scanner
 import rich
 
 SD_DIR = os.getcwd()
@@ -221,6 +220,7 @@ async def setAppConfig(req : SetAppConfigRequest):
 
 def is_malicious_model(file_path):
     try:
+        import picklescan.scanner
         scan_result = picklescan.scanner.scan_file_path(file_path)
         if scan_result.issues_count > 0 or scan_result.infected_files > 0:
             rich.print(":warning: [bold red]Scan %s: %d scanned, %d issue, %d infected.[/bold red]" % (file_path, scan_result.scanned_files, scan_result.issues_count, scan_result.infected_files))
@@ -230,9 +230,9 @@ def is_malicious_model(file_path):
             return False
     except Exception as e:
         print('error while scanning', file_path, 'error:', e)
-
     return False
 
+known_models = {}
 def getModels():
     models = {
         'active': {
@@ -255,9 +255,14 @@ def getModels():
                 if not file.endswith(model_extension):
                     continue
 
-                if is_malicious_model(os.path.join(models_dir, file)):
-                    models['scan-error'] = file
-                    return
+                model_path = os.path.join(models_dir, file)
+                mtime = os.path.getmtime(model_path)
+                mod_time = known_models[model_path] if model_path in known_models else -1
+                if mod_time != mtime:
+                    if is_malicious_model(model_path):
+                        models['scan-error'] = file
+                        return
+                known_models[model_path] = mtime
 
                 model_name = file[:-len(model_extension)]
                 models['options'][model_type].append(model_name)
@@ -435,6 +440,9 @@ class LogSuppressFilter(logging.Filter):
         return True
 logging.getLogger('uvicorn.access').addFilter(LogSuppressFilter())
 
+# Check models and prepare cache for UI open
+getModels()
+
 # Start the task_manager
 task_manager.default_model_to_load = resolve_ckpt_to_use()
 task_manager.default_vae_to_load = resolve_vae_to_use()