fix: Google sheets Bulk insert of empty array returns an error (#9725)

* fix/8924-Bulk Insert throwing error on empty data in google sheets new1

* fix/8924 Error in bulk insert empty data

* fix/8924 Code review fix for Google Sheet Bulk insert error

* fix/8924 Code review fix for Google Sheet Bulk insert error

* Fixed code review comments

* Methodconfig data changes since only empty Mono is being tested

app/server/appsmith-plugins/googleSheetsPlugin/src/main/java/com/external/config/BulkAppendMethod.java

@@ -83,7 +83,13 @@ public class BulkAppendMethod implements Method {
 
         List<RowObject> rowObjectListFromBody = null;
         try {
-            rowObjectListFromBody = this.getRowObjectListFromBody(this.objectMapper.readTree(methodConfig.getRowObjects()));
+            JsonNode body = this.objectMapper.readTree(methodConfig.getRowObjects());
+
+            if ( body.isEmpty()) {
+                return Mono.empty();
+            }
+
+            rowObjectListFromBody = this.getRowObjectListFromBody(body);
         } catch (JsonProcessingException e) {
             // Should never enter here
         }

app/server/appsmith-plugins/googleSheetsPlugin/src/main/java/com/external/plugins/GoogleSheetsPlugin.java

@@ -241,7 +241,19 @@ public class GoogleSheetsPlugin extends BasePlugin {
                                     System.out.println(e.getMessage());
                                     return Mono.just(errorResult);
                                 });
-                    });
+                    })
+                    .switchIfEmpty(handleEmptyMono());
+        }
+
+        /**
+         * Method to handle empty Mono
+         * @return Mono<ActionExecutionResult>
+         */
+        private Mono<ActionExecutionResult> handleEmptyMono() {
+            final ActionExecutionResult result = new ActionExecutionResult();
+            result.setIsExecutionSuccess(true);
+            result.setBody(objectMapper.valueToTree(Map.of("message", "No operation was performed")));
+            return Mono.just(result);
         }
 
         @Override

app/server/appsmith-plugins/googleSheetsPlugin/src/test/java/com/external/config/BulkAppendMethodTest.java

@@ -0,0 +1,58 @@
+package com.external.config;
+
+import com.appsmith.external.models.*;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.BeforeClass;
+import org.junit.Test;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+
+import java.util.ArrayList;
+import java.util.List;
+
+public class BulkAppendMethodTest {
+    final ObjectMapper objectMapper = new ObjectMapper();
+
+    /**
+     * To Test if it passes the empty Mono criteria,
+     * else it should fail
+     */
+    @Test
+    public void testBulkAppendHandleEmptyMonoExecutePrerequisites() {
+        String[] testDataArray = {"[]", ""};
+
+        for(int i=0; i<testDataArray.length; i++) {
+            BulkAppendMethod bulkAppend = new BulkAppendMethod(objectMapper);
+            Mono<Object> monoTest = bulkAppend.executePrerequisites(getMethodConfigObject(testDataArray[i]), getOAuthObject());
+
+            StepVerifier.create(monoTest)
+                    .expectComplete()
+                    .verify();
+        }
+    }
+
+   /**
+     * Simulated oAuth2 object, just to bypass few case.
+     * @return
+     */
+    private OAuth2 getOAuthObject(){
+        OAuth2 oAuth2 = new OAuth2();
+        oAuth2.setAuthenticationResponse(new AuthenticationResponse() );
+        oAuth2.getAuthenticationResponse().setToken("welcome123");
+        return oAuth2;
+    }
+
+    /**
+     * Simulated MethodConfig object with testable data.
+     * @param rowObject
+     * @return
+     */
+    private  MethodConfig getMethodConfigObject(String rowObject){
+        List properties = new ArrayList<Property>();
+        MethodConfig methodConfig = new MethodConfig(properties);
+
+        methodConfig.setRowObjects(rowObject);
+
+        return methodConfig;
+    }
+}