Fix Feast Serving not registering its store in Feast Core (#641)

* Fixed missing call in serving's CachedSpecService to register store in core.

* Add unit test to check that cachedSpecService will register store with Core.

Co-authored-by: Zhu Zhanyan <zhu.zhanyan@gojek.com>

serving/src/main/java/feast/serving/specs/CachedSpecService.java

@@ -47,7 +47,7 @@
 import org.apache.commons.lang3.tuple.Pair;
 import org.slf4j.Logger;
 
-/** In-memory cache of specs. */
+/** In-memory cache of specs hosted in Feast Core. */
 public class CachedSpecService {
 
   private static final int MAX_SPEC_COUNT = 1000;
@@ -76,7 +76,7 @@ public class CachedSpecService {
 
   public CachedSpecService(CoreSpecService coreService, StoreProto.Store store) {
     this.coreService = coreService;
-    this.store = store;
+    this.store = coreService.registerStore(store);
 
     Map<String, FeatureSetSpec> featureSets = getFeatureSetMap();
     featureToFeatureSetMapping =

serving/src/main/java/feast/serving/specs/CoreSpecService.java

@@ -23,11 +23,12 @@
 import feast.core.CoreServiceProto.ListFeatureSetsResponse;
 import feast.core.CoreServiceProto.UpdateStoreRequest;
 import feast.core.CoreServiceProto.UpdateStoreResponse;
+import feast.core.StoreProto.Store;
 import io.grpc.ManagedChannel;
 import io.grpc.ManagedChannelBuilder;
 import org.slf4j.Logger;
 
-/** Client for spec retrieval from core. */
+/** Client for interfacing with specs in Feast Core. */
 public class CoreSpecService {
 
   private static final Logger log = org.slf4j.LoggerFactory.getLogger(CoreSpecService.class);
@@ -50,4 +51,24 @@ public ListFeatureSetsResponse listFeatureSets(ListFeatureSetsRequest ListFeatur
   public UpdateStoreResponse updateStore(UpdateStoreRequest updateStoreRequest) {
     return blockingStub.updateStore(updateStoreRequest);
   }
+
+  /**
+   * Register the given store entry in Feast Core. If store already exists in Feast Core, updates
+   * the store entry in feast core.
+   *
+   * @param store entry to register/update in Feast Core.
+   * @return The register/updated store entry
+   */
+  public Store registerStore(Store store) {
+    UpdateStoreRequest request = UpdateStoreRequest.newBuilder().setStore(store).build();
+    try {
+      UpdateStoreResponse updateStoreResponse = this.updateStore(request);
+      if (!updateStoreResponse.getStore().equals(store)) {
+        throw new RuntimeException("Core store config not matching current store config");
+      }
+      return updateStoreResponse.getStore();
+    } catch (Exception e) {
+      throw new RuntimeException("Unable to update store configuration", e);
+    }
+  }
 }

serving/src/test/java/feast/serving/service/CachedSpecServiceTest.java

@@ -19,14 +19,14 @@
 import static org.hamcrest.CoreMatchers.equalTo;
 import static org.hamcrest.Matchers.containsInAnyOrder;
 import static org.junit.Assert.assertThat;
+import static org.mockito.Mockito.times;
+import static org.mockito.Mockito.verify;
 import static org.mockito.Mockito.when;
 import static org.mockito.MockitoAnnotations.initMocks;
 
 import com.google.common.collect.Lists;
 import feast.core.CoreServiceProto.ListFeatureSetsRequest;
 import feast.core.CoreServiceProto.ListFeatureSetsResponse;
-import feast.core.CoreServiceProto.UpdateStoreRequest;
-import feast.core.CoreServiceProto.UpdateStoreResponse;
 import feast.core.FeatureSetProto;
 import feast.core.FeatureSetProto.FeatureSetSpec;
 import feast.core.FeatureSetProto.FeatureSpec;
@@ -82,8 +82,7 @@ public void setUp() {
                     .build())
             .build();
 
-    when(coreService.updateStore(UpdateStoreRequest.newBuilder().setStore(store).build()))
-        .thenReturn(UpdateStoreResponse.newBuilder().setStore(store).build());
+    when(coreService.registerStore(store)).thenReturn(store);
 
     featureSetSpecs = new LinkedHashMap<>();
     featureSetSpecs.put(
@@ -143,6 +142,11 @@ public void setUp() {
     cachedSpecService = new CachedSpecService(coreService, store);
   }
 
+  @Test
+  public void shouldRegisterStoreWithCore() {
+    verify(coreService, times(1)).registerStore(cachedSpecService.getStore());
+  }
+
   @Test
   public void shouldPopulateAndReturnStore() {
     cachedSpecService.populateCache();