implement 'ReadAttribute' inside the codegen-data-model IM/DM split

examples/chef/chef.py

@@ -878,7 +878,7 @@ def main() -> int:
                         """))
             if options.do_clean:
                 shell.run_cmd("rm -rf out")
-            shell.run_cmd("gn gen out")
+            shell.run_cmd("gn gen --export-compile-commands out")
             shell.run_cmd("ninja -C out")
 
     #

src/BUILD.gn

@@ -50,7 +50,6 @@ if (chip_build_tests) {
   chip_test_group("tests") {
     deps = []
     tests = [
-      "${chip_root}/src/app/codegen-data-model/tests",
       "${chip_root}/src/app/data-model-interface/tests",
       "${chip_root}/src/access/tests",
       "${chip_root}/src/crypto/tests",
@@ -82,7 +81,15 @@ if (chip_build_tests) {
 
     if (current_os != "zephyr" && current_os != "mbed" &&
         chip_device_platform != "efr32") {
+      # Avoid these items from "one single binary" test executions. Once tests
+      # are split, we can re-visit this (and likely many others)
+      #
+      # In particular:
+      #   "app/codegen-data-model/tests" contains symbols for ember mocks which
+      #                                  are used by other tests
+
       tests += [
+        "${chip_root}/src/app/codegen-data-model/tests",
         "${chip_root}/src/setup_payload/tests",
         "${chip_root}/src/transport/raw/tests",
       ]

src/app/codegen-data-model/BUILD.gn

@@ -20,6 +20,7 @@ import("//build_overrides/chip.gni")
 #
 # Use `model.gni` to get access to:
 #   CodegenDataModel.cpp
+#   CodegenDataModel_Read.cpp
 #   CodegenDataModel.h
 #
 # The above list of files exists to satisfy the "dependency linter"

src/app/codegen-data-model/CodegenDataModel.cpp

@@ -231,13 +231,6 @@ bool CodegenDataModel::EmberCommandListIterator::Exists(const CommandId * list,
     return (*mCurrentHint == toCheck);
 }
 
-CHIP_ERROR CodegenDataModel::ReadAttribute(const InteractionModel::ReadAttributeRequest & request,
-                                           InteractionModel::ReadState & state, AttributeValueEncoder & encoder)
-{
-    // TODO: this needs an implementation
-    return CHIP_ERROR_NOT_IMPLEMENTED;
-}
-
 CHIP_ERROR CodegenDataModel::WriteAttribute(const InteractionModel::WriteAttributeRequest & request,
                                             AttributeValueDecoder & decoder)
 {

src/app/codegen-data-model/CodegenDataModel.h

@@ -68,8 +68,7 @@ class CodegenDataModel : public chip::app::InteractionModel::DataModel
     /// Generic model implementations
     CHIP_ERROR Shutdown() override { return CHIP_NO_ERROR; }
 
-    CHIP_ERROR ReadAttribute(const InteractionModel::ReadAttributeRequest & request, InteractionModel::ReadState & state,
-                             AttributeValueEncoder & encoder) override;
+    CHIP_ERROR ReadAttribute(const InteractionModel::ReadAttributeRequest & request, AttributeValueEncoder & encoder) override;
     CHIP_ERROR WriteAttribute(const InteractionModel::WriteAttributeRequest & request, AttributeValueDecoder & decoder) override;
     CHIP_ERROR Invoke(const InteractionModel::InvokeRequest & request, chip::TLV::TLVReader & input_arguments,
                       InteractionModel::InvokeReply & reply) override;