Refactor printer into own base dir

InvenTree/plugin/base/label/label.py

@@ -0,0 +1,52 @@
+"""Functions to print a label to a mixin printer"""
+import logging
+
+from django.utils.translation import gettext_lazy as _
+
+from plugin.registry import registry
+
+
+logger = logging.getLogger('inventree')
+
+
+def print_label(plugin_slug, label_image, label_instance=None, user=None):
+    """
+    Print label with the provided plugin.
+
+    This task is nominally handled by the background worker.
+
+    If the printing fails (throws an exception) then the user is notified.
+
+    Arguments:
+        plugin_slug: The unique slug (key) of the plugin
+        label_image: A PIL.Image image object to be printed
+    """
+
+    logger.info(f"Plugin '{plugin_slug}' is printing a label")
+
+    plugin = registry.plugins.get(plugin_slug, None)
+
+    if plugin is None:
+        logger.error(f"Could not find matching plugin for '{plugin_slug}'")
+        return
+
+    try:
+        plugin.print_label(label_image, width=label_instance.width, height=label_instance.height)
+    except Exception as e:
+        # Plugin threw an error - notify the user who attempted to print
+
+        ctx = {
+            'name': _('Label printing failed'),
+            'message': str(e),
+        }
+
+        logger.error(f"Label printing failed: Sending notification to user '{user}'")
+
+        # Throw an error against the plugin instance
+        common.notifications.trigger_notifaction(
+            plugin.plugin_config(),
+            'label.printing_failed',
+            targets=[user],
+            context=ctx,
+            delivery_methods=[common.notifications.UIMessageNotification]
+        )