Added GTIN product storage and remote service integration

asset/gtin_service.py

@@ -0,0 +1,41 @@
+from .models import GtinProduct
+from django.db.models import ObjectDoesNotExist
+import requests
+import logging
+
+LOGGER = logging.getLogger(__name__)
+
+
+def ask_upcitemdb_service(gtin):
+    request = f'https://api.upcitemdb.com/prod/trial/lookup?upc={gtin}'
+    response = requests.get(request)
+    if response.status_code == 200:
+        productJson = response.json()
+        print(f"Got {productJson['total']} result records")
+        if productJson['total'] > 0:
+            product = GtinProduct.objects.create(gtin=gtin, api_request=request, api_response=productJson)
+            if 'title' in productJson['items'][0]:
+                product.name = productJson['items'][0]['title']
+            if 'brand' in productJson['items'][0]:
+                product.brand = productJson['items'][0]['brand']
+            LOGGER.debug(
+                f"Creating new product entry for gtin={gtin}:\nrequest={request}\nresponse={response.status_code}:{productJson}")
+            product.save()
+            return product
+    return None
+
+
+def ask_remote_services(gtin):
+    product = ask_upcitemdb_service(gtin)
+    if product is not None:
+        return product
+    return None
+
+
+def get_by_gtin(gtin):
+    try:
+        product = GtinProduct.objects.get(gtin=gtin)
+    except ObjectDoesNotExist:
+        # ask remote services
+        product = ask_remote_services(gtin)
+    return product