Add rust native implementation of protobufs

Other changes
- Removed enum ProductType declarations in each Product action message (see protos/product_payload.proto)
- Renamed 'product_values' field to 'properties' field for coherency (see protos/product_state.proto)
- Replaced deprecated StdError 'cause' function with new 'source' function (see protocol/product/state.rs)

Signed-off-by: Raphael Santo Domingo <raphael.santodomingo@target.com>

sdk/protos/product_payload.proto

@@ -37,36 +37,24 @@ message ProductPayload {
 }
 
 message ProductCreateAction {
-    enum ProductType {
-        UNSET_TYPE = 0;
-        GS1 = 1;
-    }
     // product_type and identifier are used in deriving the state address
-    ProductType product_type = 1;
+    Product.ProductType product_type = 1;
     string identifier = 2;
     string owner = 3;
     repeated PropertyValue properties = 4;
 }
 
 message ProductUpdateAction {
-    enum ProductType {
-        UNSET_TYPE = 0;
-        GS1 = 1;
-    }
     // product_type and identifier are used in deriving the state address
-    ProductType product_type = 1;
+    Product.ProductType product_type = 1;
     string identifier = 2;
     // this will replace all properties currently defined
-    repeated PropertyValue properties = 4;
+    repeated PropertyValue properties = 3;
 }
 
 message ProductDeleteAction {
-    enum ProductType {
-        UNSET_TYPE = 0;
-        GS1 = 1;
-    }
     // product_type and identifier are used in deriving the state address
-    ProductType product_type = 1;
+    Product.ProductType product_type = 1;
     string identifier = 2;
  }
 

sdk/protos/product_state.proto

@@ -26,13 +26,13 @@ message Product {
   string identifier = 1;
 
   // What type of product is this (GS1)
-  ProductType type = 2;
+  ProductType product_type = 2;
 
   // Who owns this product (pike organization id)
   string owner = 3;
 
   // Addition attributes for custom configurations 
-  repeated PropertyValue product_values = 4;
+  repeated PropertyValue properties = 4;
 }
 
 message ProductList {

sdk/src/protocol/mod.rs

@@ -14,5 +14,6 @@
 
 pub mod errors;
 pub mod pike;
+pub mod product;
 pub mod schema;
 pub mod track_and_trace;

sdk/src/protocol/product/mod.rs

@@ -0,0 +1,18 @@
+// Copyright (c) 2019 Target Brands, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use super::errors;
+
+pub mod payload;
+pub mod state;