added implementation of peridic refresh for source control metadata

cdap-app-fabric/src/main/java/io/cdap/cdap/app/guice/AppFabricServiceRuntimeModule.java

@@ -117,6 +117,7 @@
 import io.cdap.cdap.internal.app.services.RunRecordCorrectorService;
 import io.cdap.cdap.internal.app.services.RunRecordMonitorService;
 import io.cdap.cdap.internal.app.services.ScheduledRunRecordCorrectorService;
+import io.cdap.cdap.internal.app.sourcecontrol.SourceControlMetadataRefreshService;
 import io.cdap.cdap.internal.app.store.DefaultStore;
 import io.cdap.cdap.internal.bootstrap.guice.BootstrapModules;
 import io.cdap.cdap.internal.capability.CapabilityModule;
@@ -214,6 +215,7 @@ protected void configure() {
             bind(MRJobInfoFetcher.class).to(LocalMRJobInfoFetcher.class);
             bind(StorageProviderNamespaceAdmin.class).to(LocalStorageProviderNamespaceAdmin.class);
             bind(UGIProvider.class).toProvider(UgiProviderProvider.class);
+            bind(SourceControlMetadataRefreshService.class).in(Scopes.SINGLETON);
 
             Multibinder<String> servicesNamesBinder =
                 Multibinder.newSetBinder(binder(), String.class,
@@ -258,6 +260,7 @@ protected void configure() {
             bind(MRJobInfoFetcher.class).to(LocalMRJobInfoFetcher.class);
             bind(StorageProviderNamespaceAdmin.class).to(LocalStorageProviderNamespaceAdmin.class);
             bind(UGIProvider.class).toProvider(UgiProviderProvider.class);
+            bind(SourceControlMetadataRefreshService.class).in(Scopes.SINGLETON);
 
             Multibinder<String> servicesNamesBinder =
                 Multibinder.newSetBinder(binder(), String.class,
@@ -315,6 +318,7 @@ protected void configure() {
             bind(StorageProviderNamespaceAdmin.class)
                 .to(DistributedStorageProviderNamespaceAdmin.class);
             bind(UGIProvider.class).toProvider(UgiProviderProvider.class);
+            bind(SourceControlMetadataRefreshService.class).in(Scopes.SINGLETON);
 
             bind(ProgramRunDispatcher.class).to(RemoteProgramRunDispatcher.class)
                 .in(Scopes.SINGLETON);

cdap-app-fabric/src/main/java/io/cdap/cdap/app/preview/PreviewRunnerModule.java

@@ -75,6 +75,7 @@
 import io.cdap.cdap.security.impersonation.UGIProvider;
 import io.cdap.cdap.security.spi.authorization.AccessEnforcer;
 import io.cdap.cdap.security.spi.authorization.ContextAccessEnforcer;
+import io.cdap.cdap.sourcecontrol.guice.SourceControlModule;
 import io.cdap.cdap.store.DefaultOwnerStore;
 import org.apache.twill.filesystem.LocationFactory;
 
@@ -185,6 +186,10 @@ protected void configure() {
     bind(MetadataAdmin.class).to(DefaultMetadataAdmin.class);
     expose(MetadataAdmin.class);
 
+    //TODO(adrika): cleanup this dependency later
+    // This is needed because there is a transitive dependency on source control operation
+    // runner which is not actually being used here
+    install(new SourceControlModule());
     bindPreviewRunner(binder());
     expose(PreviewRunner.class);
 

cdap-app-fabric/src/main/java/io/cdap/cdap/app/store/ListSourceControlMetadataResponse.java

@@ -0,0 +1,58 @@
+/*
+ * Copyright © 2024 Cask Data, 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.
+ */
+
+package io.cdap.cdap.app.store;
+
+import io.cdap.cdap.proto.SourceControlMetadataRecord;
+import java.util.List;
+
+/**
+ * Represents a response containing a list of source control metadata records, next page token and
+ * last refresh time.
+ */
+
+public class ListSourceControlMetadataResponse {
+
+  private final List<SourceControlMetadataRecord> apps;
+  private final String nextPageToken;
+  private final Long lastRefreshTime;
+
+  /**
+   * Constructs a ListSourceControlMetadataResponse object.
+   *
+   * @param apps            The list of source control metadata records.
+   * @param nextPageToken   The token for fetching the next page of results.
+   * @param lastRefreshTime The timestamp of the last refresh operation.
+   */
+  public ListSourceControlMetadataResponse(List<SourceControlMetadataRecord> apps,
+      String nextPageToken, Long lastRefreshTime) {
+    this.apps = apps;
+    this.nextPageToken = nextPageToken;
+    this.lastRefreshTime = lastRefreshTime;
+  }
+
+  public List<SourceControlMetadataRecord> getApps() {
+    return apps;
+  }
+
+  public String getNextPageToken() {
+    return nextPageToken;
+  }
+
+  public Long getLastRefreshTime() {
+    return lastRefreshTime;
+  }
+}

cdap-app-fabric/src/main/java/io/cdap/cdap/app/store/SingleSourceControlMetadataResponse.java

@@ -0,0 +1,48 @@
+/*
+ * Copyright © 2024 Cask Data, 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.
+ */
+
+package io.cdap.cdap.app.store;
+
+import io.cdap.cdap.proto.SourceControlMetadataRecord;
+
+/**
+ * Represents a response containing a single source control metadata record and last refresh time.
+ */
+public class SingleSourceControlMetadataResponse {
+
+  private final SourceControlMetadataRecord app;
+  private final Long lastRefreshTime;
+
+  /**
+   * Constructs a SingleSourceControlMetadataResponse object.
+   *
+   * @param app             The source control metadata record.
+   * @param lastRefreshTime The timestamp of the last refresh operation.
+   */
+  public SingleSourceControlMetadataResponse(SourceControlMetadataRecord app,
+      Long lastRefreshTime) {
+    this.app = app;
+    this.lastRefreshTime = lastRefreshTime;
+  }
+
+  public SourceControlMetadataRecord getApp() {
+    return app;
+  }
+
+  public Long getLastRefreshTime() {
+    return lastRefreshTime;
+  }
+}

cdap-app-fabric/src/main/java/io/cdap/cdap/app/store/Store.java

@@ -495,8 +495,6 @@ int scanAppSourceControlMetadata(ScanSourceControlMetadataRequest request,
   int scanRepositorySourceControlMetadata(ScanSourceControlMetadataRequest request,
       Consumer<SourceControlMetadataRecord> consumer);
 
-  void updateSourceControlMeta(ApplicationReference appRef, String repoFileHash);
-
   /**
    * Returns a Map of {@link ApplicationMeta} for the given set of {@link ApplicationId}.
    *

cdap-app-fabric/src/main/java/io/cdap/cdap/gateway/handlers/AppLifecycleHttpHandler.java

@@ -33,8 +33,10 @@
 import io.cdap.cdap.api.security.AccessException;
 import io.cdap.cdap.app.runtime.ProgramRuntimeService;
 import io.cdap.cdap.app.store.ApplicationFilter;
+import io.cdap.cdap.app.store.ListSourceControlMetadataResponse;
 import io.cdap.cdap.app.store.ScanApplicationsRequest;
 import io.cdap.cdap.app.store.ScanSourceControlMetadataRequest;
+import io.cdap.cdap.app.store.SingleSourceControlMetadataResponse;
 import io.cdap.cdap.common.ApplicationNotFoundException;
 import io.cdap.cdap.common.ArtifactAlreadyExistsException;
 import io.cdap.cdap.common.BadRequestException;
@@ -129,7 +131,6 @@ public class AppLifecycleHttpHandler extends AbstractAppLifecycleHttpHandler {
    * Key in json paginated applications list response.
    */
   public static final String APP_LIST_PAGINATED_KEY = "applications";
-  public static final String APP_LIST_PAGINATED_KEY_SHORT = "apps";
 
   /**
    * Runtime program service for running and managing programs.
@@ -319,27 +320,29 @@ public void getAllNamespaceSourceControlMetadata(FullHttpRequest request, HttpRe
       @QueryParam("filter") String filter
   ) throws Exception {
     validateNamespace(namespaceId);
-
-    JsonPaginatedListResponder.respond(GSON, responder, APP_LIST_PAGINATED_KEY_SHORT,
-        jsonListResponder -> {
-          AtomicReference<SourceControlMetadataRecord> lastRecord = new AtomicReference<>(null);
-          ScanSourceControlMetadataRequest scanRequest = SourceControlMetadataHelper.getScmStatusScanRequest(
-              namespaceId,
-              pageToken, pageSize, sortOrder, sortOn, filter);
-          boolean pageLimitReached = false;
-          try {
-            pageLimitReached = applicationLifecycleService.scanSourceControlMetadata(
-                scanRequest, batchSize,
-                scmMetaRecord -> {
-                  jsonListResponder.send(scmMetaRecord);
-                  lastRecord.set(scmMetaRecord);
-                });
-          } catch (IOException e) {
-            responder.sendString(HttpResponseStatus.INTERNAL_SERVER_ERROR, e.getMessage());
-          }
-          SourceControlMetadataRecord record = lastRecord.get();
-          return !pageLimitReached || record == null ? null : record.getName();
-        });
+    List<SourceControlMetadataRecord> apps = new ArrayList<>();
+    AtomicReference<SourceControlMetadataRecord> lastRecord = new AtomicReference<>(null);
+    ScanSourceControlMetadataRequest scanRequest = SourceControlMetadataHelper.getScmStatusScanRequest(
+        namespaceId,
+        pageToken, pageSize, sortOrder, sortOn, filter);
+    boolean pageLimitReached = false;
+    try {
+      pageLimitReached = applicationLifecycleService.scanSourceControlMetadata(
+          scanRequest, batchSize,
+          scmMetaRecord -> {
+            apps.add(scmMetaRecord);
+            lastRecord.set(scmMetaRecord);
+          });
+    } catch (IOException e) {
+      responder.sendString(HttpResponseStatus.INTERNAL_SERVER_ERROR, e.getMessage());
+    }
+    SourceControlMetadataRecord record = lastRecord.get();
+    String nextPageToken = !pageLimitReached || record == null ? null :
+        record.getName();
+    Long lastRefreshTime = applicationLifecycleService.getLastRefreshTime(namespaceId);
+    ListSourceControlMetadataResponse response = new ListSourceControlMetadataResponse(apps,
+        nextPageToken, lastRefreshTime);
+    responder.sendJson(HttpResponseStatus.OK, GSON.toJson(response));
   }
 
   /**
@@ -357,10 +360,11 @@ public void getNamespaceSourceControlMetadata(HttpRequest request, HttpResponder
       @PathParam("namespace-id") final String namespaceId,
       @PathParam("app-id") final String appName) throws Exception {
     validateApplicationId(namespaceId, appName);
-
-    responder.sendJson(HttpResponseStatus.OK,
-        GSON.toJson(applicationLifecycleService.getSourceControlMetadataRecord(
-            new ApplicationReference(namespaceId, appName))));
+    SourceControlMetadataRecord app = applicationLifecycleService.getSourceControlMetadataRecord(
+        new ApplicationReference(namespaceId, appName));
+    Long lastRefreshTime = applicationLifecycleService.getLastRefreshTime(namespaceId);
+    SingleSourceControlMetadataResponse response = new SingleSourceControlMetadataResponse(app, lastRefreshTime);
+    responder.sendJson(HttpResponseStatus.OK, GSON.toJson(response));
   }
 
   private ScanApplicationsRequest getScanRequest(String namespaceId, String artifactVersion,

cdap-app-fabric/src/main/java/io/cdap/cdap/gateway/handlers/SourceControlManagementHttpHandler.java

@@ -21,10 +21,10 @@
 import com.google.gson.JsonSyntaxException;
 import com.google.inject.Inject;
 import io.cdap.cdap.api.feature.FeatureFlagsProvider;
+import io.cdap.cdap.app.store.ListSourceControlMetadataResponse;
 import io.cdap.cdap.app.store.ScanSourceControlMetadataRequest;
 import io.cdap.cdap.common.BadRequestException;
 import io.cdap.cdap.common.ForbiddenException;
-import io.cdap.cdap.common.NotFoundException;
 import io.cdap.cdap.common.conf.CConfiguration;
 import io.cdap.cdap.common.conf.Constants;
 import io.cdap.cdap.common.conf.Constants.AppFabric;
@@ -59,6 +59,8 @@
 import io.netty.handler.codec.http.FullHttpRequest;
 import io.netty.handler.codec.http.HttpResponseStatus;
 import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.concurrent.atomic.AtomicReference;
 import javax.ws.rs.DELETE;
 import javax.ws.rs.GET;
@@ -156,29 +158,29 @@ public void listAllApplications(FullHttpRequest request, HttpResponder responder
       @QueryParam("filter") String filter) throws Exception {
     checkSourceControlFeatureFlag();
     validateNamespaceId(namespaceId);
-    JsonPaginatedListResponder.respond(GSON, responder, APP_LIST_PAGINATED_KEY_SHORT,
-        jsonListResponder -> {
-          AtomicReference<SourceControlMetadataRecord> lastRecord = new AtomicReference<>(null);
-          ScanSourceControlMetadataRequest scanRequest = SourceControlMetadataHelper.getScmStatusScanRequest(
-              namespaceId,
-              pageToken, pageSize, sortOrder, sortOn, filter);
-          boolean pageLimitReached = false;
-          try {
-            pageLimitReached = sourceControlService.scanRepoMetadata(
-                scanRequest, batchSize,
-                record -> {
-                  jsonListResponder.send(record);
-                  lastRecord.set(record);
-                });
-          } catch (IOException e) {
-            responder.sendString(HttpResponseStatus.INTERNAL_SERVER_ERROR, e.getMessage());
-          } catch (NotFoundException e) {
-            responder.sendString(HttpResponseStatus.NOT_FOUND, e.getMessage());
-          }
-          SourceControlMetadataRecord record = lastRecord.get();
-          return !pageLimitReached || record == null ? null :
-              record.getName();
-        });
+    List<SourceControlMetadataRecord> apps = new ArrayList<>();
+    AtomicReference<SourceControlMetadataRecord> lastRecord = new AtomicReference<>(null);
+    ScanSourceControlMetadataRequest scanRequest = SourceControlMetadataHelper.getScmStatusScanRequest(
+        namespaceId,
+        pageToken, pageSize, sortOrder, sortOn, filter);
+    boolean pageLimitReached = false;
+    try {
+      pageLimitReached = sourceControlService.scanRepoMetadata(
+          scanRequest, batchSize,
+          record -> {
+            apps.add(record);
+            lastRecord.set(record);
+          });
+    } catch (IOException e) {
+      responder.sendString(HttpResponseStatus.INTERNAL_SERVER_ERROR, e.getMessage());
+    }
+    SourceControlMetadataRecord record = lastRecord.get();
+    String nextPageToken = !pageLimitReached || record == null ? null :
+        record.getName();
+    Long lastRefreshTime = sourceControlService.getLastRefreshTime(namespaceId);
+    ListSourceControlMetadataResponse response = new ListSourceControlMetadataResponse(apps,
+        nextPageToken, lastRefreshTime);
+    responder.sendJson(HttpResponseStatus.OK, GSON.toJson(response));
   }
 
   /**

cdap-app-fabric/src/main/java/io/cdap/cdap/internal/app/services/AppFabricServer.java

@@ -38,6 +38,7 @@
 import io.cdap.cdap.common.security.HttpsEnabler;
 import io.cdap.cdap.features.Feature;
 import io.cdap.cdap.internal.app.sourcecontrol.SourceControlMetadataMigrationService;
+import io.cdap.cdap.internal.app.sourcecontrol.SourceControlMetadataRefreshService;
 import io.cdap.cdap.internal.app.store.AppMetadataStore;
 import io.cdap.cdap.internal.bootstrap.BootstrapService;
 import io.cdap.cdap.internal.credential.CredentialProviderService;
@@ -97,6 +98,7 @@ public class AppFabricServer extends AbstractIdleService {
   private final RepositoryCleanupService repositoryCleanupService;
   private final OperationNotificationSubscriberService operationNotificationSubscriberService;
   private final SourceControlMetadataMigrationService sourceControlMetadataMigrationService;
+  private final SourceControlMetadataRefreshService sourceControlMetadataRefreshService;
   private final CConfiguration cConf;
   private final SConfiguration sConf;
   private final boolean sslEnabled;
@@ -137,7 +139,8 @@ public AppFabricServer(CConfiguration cConf, SConfiguration sConf,
       SourceControlOperationRunner sourceControlOperationRunner,
       RepositoryCleanupService repositoryCleanupService,
       OperationNotificationSubscriberService operationNotificationSubscriberService,
-      SourceControlMetadataMigrationService sourceControlMetadataMigrationService) {
+      SourceControlMetadataMigrationService sourceControlMetadataMigrationService,
+      SourceControlMetadataRefreshService sourceControlMetadataRefreshService) {
     this.hostname = hostname;
     this.discoveryService = discoveryService;
     this.handlers = handlers;
@@ -167,6 +170,7 @@ public AppFabricServer(CConfiguration cConf, SConfiguration sConf,
     this.repositoryCleanupService = repositoryCleanupService;
     this.operationNotificationSubscriberService = operationNotificationSubscriberService;
     this.sourceControlMetadataMigrationService = sourceControlMetadataMigrationService;
+    this.sourceControlMetadataRefreshService = sourceControlMetadataRefreshService;
   }
 
   /**
@@ -199,7 +203,8 @@ protected void startUp() throws Exception {
         sourceControlOperationRunner.start(),
         repositoryCleanupService.start(),
         operationNotificationSubscriberService.start(),
-        sourceControlMetadataMigrationService.start()
+        sourceControlMetadataMigrationService.start(),
+        sourceControlMetadataRefreshService.start()
     ));
     Futures.allAsList(futuresList).get();
 
@@ -262,6 +267,7 @@ protected void shutDown() throws Exception {
     namespaceCredentialProviderService.stopAndWait();
     operationNotificationSubscriberService.stopAndWait();
     sourceControlMetadataMigrationService.stopAndWait();
+    sourceControlMetadataRefreshService.stopAndWait();
   }
 
   private Cancellable startHttpService(NettyHttpService httpService) throws Exception {