Merge pull request #1948 from Yeleights/dev-process

Add process null check.

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/BaseDAGService.java

@@ -20,12 +20,11 @@ import org.apache.dolphinscheduler.common.graph.DAG;
 import org.apache.dolphinscheduler.common.model.TaskNode;
 import org.apache.dolphinscheduler.common.model.TaskNodeRelation;
 import org.apache.dolphinscheduler.common.process.ProcessDag;
-import org.apache.dolphinscheduler.common.utils.CollectionUtils;
 import org.apache.dolphinscheduler.common.utils.JSONUtils;
 import org.apache.dolphinscheduler.dao.entity.ProcessData;
 import org.apache.dolphinscheduler.dao.entity.ProcessInstance;
+import org.apache.dolphinscheduler.dao.utils.DagHelper;
 
-import java.util.ArrayList;
 import java.util.List;
 
 /**
@@ -48,41 +47,8 @@ public class BaseDAGService extends BaseService{
 
         List<TaskNode> taskNodeList = processData.getTasks();
 
-        List<TaskNodeRelation> taskNodeRelations = new ArrayList<>();
+        ProcessDag processDag = DagHelper.getProcessDag(taskNodeList);
 
-        //Traversing node information and building relationships
-        for (TaskNode taskNode : taskNodeList) {
-            String preTasks = taskNode.getPreTasks();
-            List<String> preTasksList = JSONUtils.toList(preTasks, String.class);
-
-            //if previous tasks not empty
-            if (preTasksList != null) {
-                for (String depNode : preTasksList) {
-                    taskNodeRelations.add(new TaskNodeRelation(depNode, taskNode.getName()));
-                }
-            }
-        }
-
-        ProcessDag processDag = new ProcessDag();
-        processDag.setEdges(taskNodeRelations);
-        processDag.setNodes(taskNodeList);
-
-
-        // generate detail Dag, to be executed
-        DAG<String, TaskNode, TaskNodeRelation> dag = new DAG<>();
-
-        if (CollectionUtils.isNotEmpty(processDag.getNodes())) {
-            for (TaskNode node : processDag.getNodes()) {
-                dag.addNode(node.getName(), node);
-            }
-        }
-
-        if (CollectionUtils.isNotEmpty(processDag.getEdges())) {
-            for (TaskNodeRelation edge : processDag.getEdges()) {
-                dag.addEdge(edge.getStartNode(), edge.getEndNode());
-            }
-        }
-
-        return dag;
+        return DagHelper.buildDagGraph(processDag);
     }
 }

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/ProcessDefinitionService.java

@@ -45,6 +45,7 @@ import org.apache.dolphinscheduler.common.utils.JSONUtils;
 import org.apache.dolphinscheduler.common.utils.StringUtils;
 import org.apache.dolphinscheduler.dao.entity.*;
 import org.apache.dolphinscheduler.dao.mapper.*;
+import org.apache.dolphinscheduler.dao.utils.DagHelper;
 import org.apache.dolphinscheduler.service.process.ProcessService;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -465,7 +466,7 @@ public class ProcessDefinitionService extends BaseDAGService {
                 );
 
                 for(Schedule schedule:scheduleList){
-                    logger.info("set schedule offline, schedule id: {}, process definition id: {}", project.getId(), schedule.getId(), id);
+                    logger.info("set schedule offline, project id: {}, schedule id: {}, process definition id: {}", project.getId(), schedule.getId(), id);
                     // set status
                     schedule.setReleaseState(ReleaseState.OFFLINE);
                     scheduleMapper.updateById(schedule);
@@ -948,11 +949,16 @@ public class ProcessDefinitionService extends BaseDAGService {
             return result;
         }
 
-
         String processDefinitionJson = processDefinition.getProcessDefinitionJson();
-
         ProcessData processData = JSONUtils.parseObject(processDefinitionJson, ProcessData.class);
 
+        //process data check
+        if (null == processData) {
+            logger.error("process data is null");
+            putMsg(result,Status.DATA_IS_NOT_VALID, processDefinitionJson);
+            return result;
+        }
+
         List<TaskNode> taskNodeList = (processData.getTasks() == null) ? new ArrayList<>() : processData.getTasks();
 
         result.put(Constants.DATA_LIST, taskNodeList);
@@ -974,14 +980,13 @@ public class ProcessDefinitionService extends BaseDAGService {
 
         Map<Integer, List<TaskNode>> taskNodeMap = new HashMap<>();
         String[] idList = defineIdList.split(",");
-        List<String> definitionIdList = Arrays.asList(idList);
         List<Integer> idIntList = new ArrayList<>();
-        for(String definitionId : definitionIdList) {
+        for(String definitionId : idList) {
             idIntList.add(Integer.parseInt(definitionId));
         }
         Integer[] idArray = idIntList.toArray(new Integer[idIntList.size()]);
         List<ProcessDefinition> processDefinitionList = processDefineMapper.queryDefinitionListByIdList(idArray);
-        if (processDefinitionList == null || processDefinitionList.size() ==0) {
+        if (CollectionUtils.isEmpty(processDefinitionList)) {
             logger.info("process definition not exists");
             putMsg(result, Status.PROCESS_DEFINE_NOT_EXIST, defineIdList);
             return result;
@@ -1031,9 +1036,10 @@ public class ProcessDefinitionService extends BaseDAGService {
         Map<String, Object> result = new HashMap<>();
 
         ProcessDefinition processDefinition = processDefineMapper.selectById(processId);
-        if (processDefinition == null) {
+        if (null == processDefinition) {
             logger.info("process define not exists");
-            throw new RuntimeException("process define not exists");
+            putMsg(result,Status.PROCESS_DEFINE_NOT_EXIST, processDefinition);
+            return result;
         }
         DAG<String, TaskNode, TaskNodeRelation> dag = genDagGraph(processDefinition);
         /**
@@ -1121,10 +1127,10 @@ public class ProcessDefinitionService extends BaseDAGService {
                     pTreeViewDto.getChildren().add(treeViewDto);
                 }
                 postNodeList = dag.getSubsequentNodes(nodeName);
-                if (postNodeList != null && postNodeList.size() > 0) {
+                if (CollectionUtils.isNotEmpty(postNodeList)) {
                     for (String nextNodeName : postNodeList) {
                         List<TreeViewDto> treeViewDtoList = waitingRunningNodeMap.get(nextNodeName);
-                        if (treeViewDtoList != null && treeViewDtoList.size() > 0) {
+                        if (CollectionUtils.isNotEmpty(treeViewDtoList)) {
                             treeViewDtoList.add(treeViewDto);
                             waitingRunningNodeMap.put(nextNodeName, treeViewDtoList);
                         } else {
@@ -1136,7 +1142,6 @@ public class ProcessDefinitionService extends BaseDAGService {
                 }
                 runningNodeMap.remove(nodeName);
             }
-
             if (waitingRunningNodeMap == null || waitingRunningNodeMap.size() == 0) {
                 break;
             } else {
@@ -1161,75 +1166,29 @@ public class ProcessDefinitionService extends BaseDAGService {
     private DAG<String, TaskNode, TaskNodeRelation> genDagGraph(ProcessDefinition processDefinition) throws Exception {
 
         String processDefinitionJson = processDefinition.getProcessDefinitionJson();
-
         ProcessData processData = JSONUtils.parseObject(processDefinitionJson, ProcessData.class);
 
-        List<TaskNode> taskNodeList = processData.getTasks();
+        //check process data
+        if (null != processData) {
+            List<TaskNode> taskNodeList = processData.getTasks();
+            processDefinition.setGlobalParamList(processData.getGlobalParams());
+            ProcessDag processDag = DagHelper.getProcessDag(taskNodeList);
 
-        processDefinition.setGlobalParamList(processData.getGlobalParams());
-
-
-        List<TaskNodeRelation> taskNodeRelations = new ArrayList<>();
-
-        // Traverse node information and build relationships
-        for (TaskNode taskNode : taskNodeList) {
-            String preTasks = taskNode.getPreTasks();
-            List<String> preTasksList = JSONUtils.toList(preTasks, String.class);
-
-            // If the dependency is not empty
-            if (preTasksList != null) {
-                for (String depNode : preTasksList) {
-                    taskNodeRelations.add(new TaskNodeRelation(depNode, taskNode.getName()));
-                }
-            }
+            // Generate concrete Dag to be executed
+            return DagHelper.buildDagGraph(processDag);
         }
 
-        ProcessDag processDag = new ProcessDag();
-        processDag.setEdges(taskNodeRelations);
-        processDag.setNodes(taskNodeList);
-
-
-        // Generate concrete Dag to be executed
-        return genDagGraph(processDag);
-
-
+        return new DAG<>();
     }
 
-    /**
-     * Generate the DAG of process
-     *
-     * @return DAG
-     */
-    private DAG<String, TaskNode, TaskNodeRelation> genDagGraph(ProcessDag processDag) {
-        DAG<String, TaskNode, TaskNodeRelation> dag = new DAG<>();
-
-        /**
-         * Add the ndoes
-         */
-        if (CollectionUtils.isNotEmpty(processDag.getNodes())) {
-            for (TaskNode node : processDag.getNodes()) {
-                dag.addNode(node.getName(), node);
-            }
-        }
-
-        /**
-         * Add the edges
-         */
-        if (CollectionUtils.isNotEmpty(processDag.getEdges())) {
-            for (TaskNodeRelation edge : processDag.getEdges()) {
-                dag.addEdge(edge.getStartNode(), edge.getEndNode());
-            }
-        }
 
-        return dag;
-    }
 
 
     /**
      * whether the graph has a ring
      *
-     * @param taskNodeResponseList
-     * @return
+     * @param taskNodeResponseList task node response list
+     * @return if graph has cycle flag
      */
     private boolean graphHasCycle(List<TaskNode> taskNodeResponseList) {
         DAG<String, TaskNode, String> graph = new DAG<>();

dolphinscheduler-api/src/test/java/org/apache/dolphinscheduler/api/service/ProcessDefinitionServiceTest.java

@@ -16,10 +16,8 @@
  */
 package org.apache.dolphinscheduler.api.service;
 
-import com.alibaba.fastjson.JSON;
 import com.alibaba.fastjson.JSONArray;
 import com.alibaba.fastjson.JSONObject;
-import com.baomidou.mybatisplus.core.metadata.IPage;
 import org.apache.dolphinscheduler.api.ApiApplicationServer;
 import org.apache.dolphinscheduler.api.dto.ProcessMeta;
 import org.apache.dolphinscheduler.api.enums.Status;
@@ -82,6 +80,12 @@ public class ProcessDefinitionServiceTest {
     @Mock
     private ProcessService processService;
 
+    @Mock
+    private ProcessInstanceMapper processInstanceMapper;
+
+    @Mock
+    private TaskInstanceMapper taskInstanceMapper;
+
     private String sqlDependentJson = "{\"globalParams\":[]," +
             "\"tasks\":[{\"type\":\"SQL\",\"id\":\"tasks-27297\",\"name\":\"sql\"," +
             "\"params\":{\"type\":\"MYSQL\",\"datasource\":1,\"sql\":\"select * from test\"," +
@@ -99,6 +103,12 @@ public class ProcessDefinitionServiceTest {
             "\"timeout\":{\"strategy\":\"\",\"enable\":false},\"taskInstancePriority\":\"MEDIUM\"," +
             "\"workerGroupId\":-1,\"preTasks\":[]}],\"tenantId\":1,\"timeout\":0}";
 
+    private String shellJson = "{\"globalParams\":[],\"tasks\":[{\"type\":\"SHELL\",\"id\":\"tasks-9527\",\"name\":\"shell-1\"," +
+            "\"params\":{\"resourceList\":[],\"localParams\":[],\"rawScript\":\"#!/bin/bash\\necho \\\"shell-1\\\"\"}," +
+            "\"description\":\"\",\"runFlag\":\"NORMAL\",\"dependence\":{},\"maxRetryTimes\":\"0\",\"retryInterval\":\"1\"," +
+            "\"timeout\":{\"strategy\":\"\",\"interval\":1,\"enable\":false},\"taskInstancePriority\":\"MEDIUM\"," +
+            "\"workerGroupId\":-1,\"preTasks\":[]}],\"tenantId\":1,\"timeout\":0}";
+
     @Test
     public void testQueryProccessDefinitionList() {
         String projectName = "project_test1";
@@ -149,7 +159,7 @@ public class ProcessDefinitionServiceTest {
     }
 
     @Test
-    public void testQueryProccessDefinitionById() {
+    public void testQueryProcessDefinitionById() {
         String projectName = "project_test1";
         Mockito.when(projectMapper.queryByName(projectName)).thenReturn(getProject(projectName));
 
@@ -255,7 +265,7 @@ public class ProcessDefinitionServiceTest {
                 "project_test1", 46);
         Assert.assertEquals(Status.DELETE_PROCESS_DEFINE_BY_ID_ERROR, deleteFail.get(Constants.STATUS));
 
-        //delte success
+        //delete success
         Mockito.when(processDefineMapper.deleteById(46)).thenReturn(1);
         Map<String, Object> deleteSuccess = processDefinitionService.deleteProcessDefinitionById(loginUser,
                 "project_test1", 46);
@@ -304,6 +314,155 @@ public class ProcessDefinitionServiceTest {
         Assert.assertEquals(Status.REQUEST_PARAMS_NOT_VALID_ERROR, failRes.get(Constants.STATUS));
     }
 
+    @Test
+    public void testVerifyProcessDefinitionName() {
+        String projectName = "project_test1";
+        Mockito.when(projectMapper.queryByName(projectName)).thenReturn(getProject(projectName));
+
+        Project project = getProject(projectName);
+        User loginUser = new User();
+        loginUser.setId(-1);
+        loginUser.setUserType(UserType.GENERAL_USER);
+
+        //project check auth fail
+        Map<String, Object> result = new HashMap<>(5);
+        putMsg(result, Status.PROJECT_NOT_FOUNT, projectName);
+        Mockito.when(projectService.checkProjectAndAuth(loginUser,project,projectName)).thenReturn(result);
+        Map<String, Object> map = processDefinitionService.verifyProccessDefinitionName(loginUser,
+                "project_test1", "test_pdf");
+        Assert.assertEquals(Status.PROJECT_NOT_FOUNT, map.get(Constants.STATUS));
+
+        //project check auth success, process not exist
+        putMsg(result, Status.SUCCESS, projectName);
+        Mockito.when(processDefineMapper.queryByDefineName(project.getId(),"test_pdf")).thenReturn(null);
+        Map<String, Object> processNotExistRes = processDefinitionService.verifyProccessDefinitionName(loginUser,
+                "project_test1", "test_pdf");
+        Assert.assertEquals(Status.SUCCESS, processNotExistRes.get(Constants.STATUS));
+
+        //process exist
+        Mockito.when(processDefineMapper.queryByDefineName(project.getId(),"test_pdf")).thenReturn(getProcessDefinition());
+        Map<String, Object> processExistRes = processDefinitionService.verifyProccessDefinitionName(loginUser,
+                "project_test1", "test_pdf");
+        Assert.assertEquals(Status.PROCESS_INSTANCE_EXIST, processExistRes.get(Constants.STATUS));
+    }
+
+    @Test
+    public void testCheckProcessNodeList() {
+
+        Map<String, Object> dataNotValidRes = processDefinitionService.checkProcessNodeList(null, "");
+        Assert.assertEquals(Status.DATA_IS_NOT_VALID, dataNotValidRes.get(Constants.STATUS));
+
+        //task not empty
+        String processDefinitionJson = shellJson;
+        ProcessData processData = JSONUtils.parseObject(processDefinitionJson, ProcessData.class);
+        assert processData != null;
+        Map<String, Object> taskEmptyRes = processDefinitionService.checkProcessNodeList(processData, processDefinitionJson);
+        Assert.assertEquals(Status.SUCCESS, taskEmptyRes.get(Constants.STATUS));
+
+        //task empty
+        processData.setTasks(null);
+        Map<String, Object> taskNotEmptyRes = processDefinitionService.checkProcessNodeList(processData, processDefinitionJson);
+        Assert.assertEquals(Status.DATA_IS_NULL, taskNotEmptyRes.get(Constants.STATUS));
+
+        //json abnormal
+        String abnormalJson = processDefinitionJson.replaceAll("SHELL","");
+        processData = JSONUtils.parseObject(abnormalJson, ProcessData.class);
+        Map<String, Object> abnormalTaskRes = processDefinitionService.checkProcessNodeList(processData, abnormalJson);
+        Assert.assertEquals(Status.PROCESS_NODE_S_PARAMETER_INVALID, abnormalTaskRes.get(Constants.STATUS));
+    }
+
+    @Test
+    public void testGetTaskNodeListByDefinitionId() throws Exception {
+        //process definition not exist
+        Mockito.when(processDefineMapper.selectById(46)).thenReturn(null);
+        Map<String, Object> processDefinitionNullRes = processDefinitionService.getTaskNodeListByDefinitionId(46);
+        Assert.assertEquals(Status.PROCESS_DEFINE_NOT_EXIST, processDefinitionNullRes.get(Constants.STATUS));
+
+        //process data null
+        ProcessDefinition processDefinition = getProcessDefinition();
+        Mockito.when(processDefineMapper.selectById(46)).thenReturn(processDefinition);
+        Map<String, Object> successRes = processDefinitionService.getTaskNodeListByDefinitionId(46);
+        Assert.assertEquals(Status.DATA_IS_NOT_VALID, successRes.get(Constants.STATUS));
+
+        //success
+        processDefinition.setProcessDefinitionJson(shellJson);
+        Mockito.when(processDefineMapper.selectById(46)).thenReturn(processDefinition);
+        Map<String, Object> dataNotValidRes = processDefinitionService.getTaskNodeListByDefinitionId(46);
+        Assert.assertEquals(Status.SUCCESS, dataNotValidRes.get(Constants.STATUS));
+    }
+
+    @Test
+    public void testGetTaskNodeListByDefinitionIdList() throws Exception {
+        //process definition not exist
+        String defineIdList = "46";
+        Integer[] idArray = {46};
+        Mockito.when(processDefineMapper.queryDefinitionListByIdList(idArray)).thenReturn(null);
+        Map<String, Object> processNotExistRes = processDefinitionService.getTaskNodeListByDefinitionIdList(defineIdList);
+        Assert.assertEquals(Status.PROCESS_DEFINE_NOT_EXIST, processNotExistRes.get(Constants.STATUS));
+
+        //process definition exist
+        ProcessDefinition processDefinition = getProcessDefinition();
+        processDefinition.setProcessDefinitionJson(shellJson);
+        List<ProcessDefinition> processDefinitionList = new ArrayList<>();
+        processDefinitionList.add(processDefinition);
+        Mockito.when(processDefineMapper.queryDefinitionListByIdList(idArray)).thenReturn(processDefinitionList);
+        Map<String, Object> successRes = processDefinitionService.getTaskNodeListByDefinitionIdList(defineIdList);
+        Assert.assertEquals(Status.SUCCESS, successRes.get(Constants.STATUS));
+    }
+
+    @Test
+    public void testQueryProccessDefinitionAllByProjectId() {
+        int projectId = 1;
+        ProcessDefinition processDefinition = getProcessDefinition();
+        processDefinition.setProcessDefinitionJson(shellJson);
+        List<ProcessDefinition> processDefinitionList = new ArrayList<>();
+        processDefinitionList.add(processDefinition);
+        Mockito.when(processDefineMapper.queryAllDefinitionList(projectId)).thenReturn(processDefinitionList);
+        Map<String, Object> successRes = processDefinitionService.queryProccessDefinitionAllByProjectId(projectId);
+        Assert.assertEquals(Status.SUCCESS, successRes.get(Constants.STATUS));
+    }
+
+    @Test
+    public void testViewTree() throws Exception {
+        //process definition not exist
+        ProcessDefinition processDefinition = getProcessDefinition();
+        processDefinition.setProcessDefinitionJson(shellJson);
+        Mockito.when(processDefineMapper.selectById(46)).thenReturn(null);
+        Map<String, Object> processDefinitionNullRes = processDefinitionService.viewTree(46, 10);
+        Assert.assertEquals(Status.PROCESS_DEFINE_NOT_EXIST, processDefinitionNullRes.get(Constants.STATUS));
+
+        List<ProcessInstance> processInstanceList = new ArrayList<>();
+        ProcessInstance processInstance = new ProcessInstance();
+        processInstance.setId(1);
+        processInstance.setName("test_instance");
+        processInstance.setState(ExecutionStatus.RUNNING_EXEUTION);
+        processInstance.setHost("192.168.xx.xx");
+        processInstance.setStartTime(new Date());
+        processInstance.setEndTime(new Date());
+        processInstanceList.add(processInstance);
+
+        TaskInstance taskInstance = new TaskInstance();
+        taskInstance.setStartTime(new Date());
+        taskInstance.setEndTime(new Date());
+        taskInstance.setTaskType("SHELL");
+        taskInstance.setId(1);
+        taskInstance.setName("test_task_instance");
+        taskInstance.setState(ExecutionStatus.RUNNING_EXEUTION);
+        taskInstance.setHost("192.168.xx.xx");
+
+        //task instance not exist
+        Mockito.when(processDefineMapper.selectById(46)).thenReturn(processDefinition);
+        Mockito.when(processInstanceMapper.queryByProcessDefineId(46, 10)).thenReturn(processInstanceList);
+        Mockito.when(taskInstanceMapper.queryByInstanceIdAndName(processInstance.getId(), "shell-1")).thenReturn(null);
+        Map<String, Object> taskNullRes = processDefinitionService.viewTree(46, 10);
+        Assert.assertEquals(Status.SUCCESS, taskNullRes.get(Constants.STATUS));
+
+        //task instance exist
+        Mockito.when(taskInstanceMapper.queryByInstanceIdAndName(processInstance.getId(), "shell-1")).thenReturn(taskInstance);
+        Map<String, Object> taskNotNuLLRes = processDefinitionService.viewTree(46, 10);
+        Assert.assertEquals(Status.SUCCESS, taskNotNuLLRes.get(Constants.STATUS));
+    }
+
     /**
      * add datasource param and dependent when export process
      * @throws JSONException
@@ -334,13 +493,9 @@ public class ProcessDefinitionServiceTest {
 
     @Test
     public void testAddExportTaskNodeSpecialParam() throws JSONException {
-        String shellJson = "{\"globalParams\":[],\"tasks\":[{\"id\":\"tasks-9527\",\"name\":\"shell-1\"," +
-                "\"params\":{\"resourceList\":[],\"localParams\":[],\"rawScript\":\"#!/bin/bash\\necho \\\"shell-1\\\"\"}," +
-                "\"description\":\"\",\"runFlag\":\"NORMAL\",\"dependence\":{},\"maxRetryTimes\":\"0\",\"retryInterval\":\"1\"," +
-                "\"timeout\":{\"strategy\":\"\",\"interval\":1,\"enable\":false},\"taskInstancePriority\":\"MEDIUM\"," +
-                "\"workerGroupId\":-1,\"preTasks\":[]}],\"tenantId\":1,\"timeout\":0}";
+        String shellData = shellJson;
 
-        String resultStr = processDefinitionService.addExportTaskNodeSpecialParam(shellJson);
+        String resultStr = processDefinitionService.addExportTaskNodeSpecialParam(shellData);
         JSONAssert.assertEquals(shellJson, resultStr, false);
     }
 
@@ -610,7 +765,7 @@ public class ProcessDefinitionServiceTest {
     private ProcessDefinition getProcessDefinition(){
         ProcessDefinition processDefinition = new ProcessDefinition();
         processDefinition.setId(46);
-        processDefinition.setName("testProject");
+        processDefinition.setName("test_pdf");
         processDefinition.setProjectId(2);
         processDefinition.setTenantId(1);
         processDefinition.setDescription("");

dolphinscheduler-dao/src/main/java/org/apache/dolphinscheduler/dao/utils/DagHelper.java

@@ -319,18 +319,14 @@ public class DagHelper {
 
         DAG<String,TaskNode,TaskNodeRelation> dag = new DAG<>();
 
-        /**
-         * add vertex
-         */
+        //add vertex
         if (CollectionUtils.isNotEmpty(processDag.getNodes())){
             for (TaskNode node : processDag.getNodes()){
                 dag.addNode(node.getName(),node);
             }
         }
 
-        /**
-         * add edge
-         */
+        //add edge
         if (CollectionUtils.isNotEmpty(processDag.getEdges())){
             for (TaskNodeRelation edge : processDag.getEdges()){
                 dag.addEdge(edge.getStartNode(),edge.getEndNode());
@@ -338,4 +334,31 @@ public class DagHelper {
         }
         return dag;
     }
+
+    /**
+     * get process dag
+     * @param taskNodeList task node list
+     * @return Process dag
+     */
+    public static ProcessDag getProcessDag(List<TaskNode> taskNodeList) {
+        List<TaskNodeRelation> taskNodeRelations = new ArrayList<>();
+
+        // Traverse node information and build relationships
+        for (TaskNode taskNode : taskNodeList) {
+            String preTasks = taskNode.getPreTasks();
+            List<String> preTasksList = JSONUtils.toList(preTasks, String.class);
+
+            // If the dependency is not empty
+            if (preTasksList != null) {
+                for (String depNode : preTasksList) {
+                    taskNodeRelations.add(new TaskNodeRelation(depNode, taskNode.getName()));
+                }
+            }
+        }
+
+        ProcessDag processDag = new ProcessDag();
+        processDag.setEdges(taskNodeRelations);
+        processDag.setNodes(taskNodeList);
+        return processDag;
+    }
 }

dolphinscheduler-dao/src/test/java/org/apache/dolphinscheduler/dao/utils/DagHelperTest.java

@@ -24,6 +24,8 @@ import org.apache.dolphinscheduler.common.graph.DAG;
 import org.apache.dolphinscheduler.common.model.TaskNode;
 import org.apache.dolphinscheduler.common.model.TaskNodeRelation;
 import org.apache.dolphinscheduler.common.process.ProcessDag;
+import org.apache.dolphinscheduler.common.utils.JSONUtils;
+import org.apache.dolphinscheduler.dao.entity.ProcessData;
 import org.apache.dolphinscheduler.dao.entity.TaskInstance;
 import org.junit.Assert;
 import org.junit.Test;
@@ -37,7 +39,6 @@ import java.util.Map;
  * dag helper test
  */
 public class DagHelperTest {
-
     /**
      * test task node can submit
      * @throws JsonProcessingException if error throws JsonProcessingException
@@ -131,4 +132,20 @@ public class DagHelperTest {
         return DagHelper.buildDagGraph(processDag);
     }
 
+    @Test
+    public void testBuildDagGraph() {
+        String shellJson = "{\"globalParams\":[],\"tasks\":[{\"type\":\"SHELL\",\"id\":\"tasks-9527\",\"name\":\"shell-1\"," +
+                "\"params\":{\"resourceList\":[],\"localParams\":[],\"rawScript\":\"#!/bin/bash\\necho \\\"shell-1\\\"\"}," +
+                "\"description\":\"\",\"runFlag\":\"NORMAL\",\"dependence\":{},\"maxRetryTimes\":\"0\",\"retryInterval\":\"1\"," +
+                "\"timeout\":{\"strategy\":\"\",\"interval\":1,\"enable\":false},\"taskInstancePriority\":\"MEDIUM\"," +
+                "\"workerGroupId\":-1,\"preTasks\":[]}],\"tenantId\":1,\"timeout\":0}";
+
+        ProcessData processData = JSONUtils.parseObject(shellJson, ProcessData.class);
+        assert processData != null;
+        List<TaskNode> taskNodeList = processData.getTasks();
+        ProcessDag processDag = DagHelper.getProcessDag(taskNodeList);
+        DAG<String, TaskNode, TaskNodeRelation> dag = DagHelper.buildDagGraph(processDag);
+        Assert.assertNotNull(dag);
+    }
+
 }

pom.xml

@@ -721,6 +721,7 @@
                         <include>**/dao/mapper/AlertMapperTest.java</include>
                         <include>**/dao/mapper/CommandMapperTest.java</include>
                         <include>**/dao/cron/CronUtilsTest.java</include>
+                        <include>**/dao/utils/DagHelperTest.java</include>
                         <include>**/alert/template/AlertTemplateFactoryTest.java</include>
                         <include>**/alert/template/impl/DefaultHTMLTemplateTest.java</include>
                         <include>**/server/worker/task/datax/DataxTaskTest.java</include>