Tweak for plugin loading (#10631)

Prevent plugin install on server launch under certain conditions

src/backend/InvenTree/plugin/registry.py

@@ -27,10 +27,10 @@ from django.utils.translation import gettext_lazy as _
 import structlog
 
 import InvenTree.cache
+import InvenTree.ready
 from common.settings import get_global_setting, set_global_setting
 from InvenTree.config import get_plugin_dir
 from InvenTree.exceptions import log_error
-from InvenTree.ready import canAppAccessDatabase
 
 from .helpers import (
     IntegrationPluginError,
@@ -152,8 +152,18 @@ class PluginsRegistry:
 
         # Install plugins from file (if required)
         if InvenTreeSetting.get_setting('PLUGIN_ON_STARTUP', create=False, cache=False):
-            # make sure all plugins are installed
-            registry.install_plugin_file()
+            if InvenTree.ready.isInTestMode() and not settings.PLUGIN_TESTING:
+                # Ignore plugin reload in test mode
+                pass
+            elif InvenTree.ready.isRunningBackup():
+                # Ignore plugin reload during backup
+                pass
+            elif InvenTree.ready.isGeneratingSchema():
+                # Ignore plugin reload during schema generation
+                pass
+            elif InvenTree.ready.isInWorkerThread() or InvenTree.ready.isInMainThread():
+                # make sure all plugins are installed
+                registry.install_plugin_file()
 
         # Perform initial plugin discovery
         self.reload_plugins(full_reload=True, force_reload=True, collect=True)
@@ -375,7 +385,7 @@ class PluginsRegistry:
         logger.debug('Finished loading plugins')
 
         # Trigger plugins_loaded event
-        if canAppAccessDatabase():
+        if InvenTree.ready.canAppAccessDatabase():
             from plugin.events import PluginEvents, trigger_event
 
             trigger_event(PluginEvents.PLUGINS_LOADED)
@@ -1033,7 +1043,7 @@ class PluginsRegistry:
             # Skip if running during unit testing
             return False
 
-        if not canAppAccessDatabase(
+        if not InvenTree.ready.canAppAccessDatabase(
             allow_shell=True, allow_test=settings.PLUGIN_TESTING_RELOAD
         ):
             # Skip check if database cannot be accessed