Plugin framework

- Registers some very simple barcode plugins

InvenTree/plugins/barcode/barcode.py

@@ -0,0 +1,19 @@
+# -*- coding: utf-8 -*-
+
+
+class BarcodePlugin:
+    """
+    The BarcodePlugin class is the base class for any barcode plugin.
+    """
+
+    # Override this for each actual plugin
+    PLUGIN_NAME = ''
+
+    def validate_barcode(self, barcode_data):
+        """
+        Default implementation returns False
+        """
+        return False
+
+    def __init__(self):
+        pass

InvenTree/plugins/barcode/digikey.py

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+# -*- coding: utf-8 -*-
+
+from . import barcode
+
+
+class DigikeyBarcodePlugin(barcode.BarcodePlugin):
+
+    PLUGIN_NAME = "DigikeyBarcodePlugin"

InvenTree/plugins/barcode/inventree.py

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+# -*- coding: utf-8 -*-
+
+from . import barcode
+
+
+class InvenTreeBarcodePlugin(barcode.BarcodePlugin):
+
+    PLUGIN_NAME = "InvenTreeBarcodePlugin"
+
+    def validate_barcode(self, barcode_data):
+
+        print("testing")
+
+        return True

InvenTree/plugins/plugins.py

@@ -0,0 +1,52 @@
+# -*- coding: utf-8 -*-
+
+import inspect
+import importlib
+import pkgutil
+
+# Barcode plugins
+import plugins.barcode as barcode
+from plugins.barcode.barcode import BarcodePlugin
+
+
+def iter_namespace(pkg):
+
+    return pkgutil.iter_modules(pkg.__path__, pkg.__name__ + ".")
+
+
+def get_modules(pkg):
+    # Return all modules in a given package
+    return [importlib.import_module(name) for finder, name, ispkg in iter_namespace(barcode)]
+
+
+def get_classes(module):
+    # Return all classes in a given module
+    return inspect.getmembers(module, inspect.isclass)
+
+
+def get_plugins(pkg, baseclass):
+    """
+    Return a list of all modules under a given package.
+
+    - Modules must be a subclass of the provided 'baseclass'
+    - Modules must have a non-empty PLUGIN_NAME parameter
+    """
+
+    plugins = []
+
+    modules = get_modules(pkg)
+
+    # Iterate through each module in the package
+    for mod in modules:
+        # Iterate through each class in the module
+        for item in get_classes(mod):
+            plugin = item[1]
+            if plugin.__class__ is type(baseclass) and plugin.PLUGIN_NAME:
+                plugins.append(plugin)
+
+    return plugins
+
+
+def load_barcode_plugins():
+
+    return get_plugins(barcode, BarcodePlugin)