Add load all instance states api for UI # control-panel-cluster (#5812)

* Add load all instance states api for UI

* remove redundant code

* optimize code about load state failed

shardingsphere-control-panel/shardingsphere-cluster/shardingsphere-cluster-state/src/main/java/org/apache/shardingsphere/cluster/state/enums/NodeState.java

@@ -22,5 +22,5 @@ package org.apache.shardingsphere.cluster.state.enums;
  */
 public enum NodeState {
     
-    ONLINE, INTERRUPT, OFFLINE, DISABLED;
+    ONLINE, INTERRUPT, OFFLINE, DISABLED, UNKNOWN;
 }

shardingsphere-ui/shardingsphere-ui-backend/pom.xml

@@ -56,7 +56,11 @@
             <artifactId>shardingsphere-orchestration-center-zookeeper-curator</artifactId>
             <version>${project.version}</version>
         </dependency>
-        
+        <dependency>
+            <groupId>org.apache.shardingsphere</groupId>
+            <artifactId>shardingsphere-cluster-facade</artifactId>
+            <version>${project.version}</version>
+        </dependency>
         <dependency>
             <groupId>commons-codec</groupId>
             <artifactId>commons-codec</artifactId>

shardingsphere-ui/shardingsphere-ui-backend/src/main/java/org/apache/shardingsphere/ui/servcie/ClusterService.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.shardingsphere.ui.servcie;
+
+import org.apache.shardingsphere.cluster.state.InstanceState;
+
+import java.util.Map;
+
+/**
+ * Cluster service.
+ */
+public interface ClusterService {
+    
+    /**
+     * Load all instance states.
+     *
+     * @return all instance states
+     */
+    Map<String, InstanceState> loadAllInstanceStates();
+}

shardingsphere-ui/shardingsphere-ui-backend/src/main/java/org/apache/shardingsphere/ui/servcie/impl/ClusterServiceImpl.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.shardingsphere.ui.servcie.impl;
+
+import lombok.extern.slf4j.Slf4j;
+import org.apache.shardingsphere.cluster.state.InstanceState;
+import org.apache.shardingsphere.cluster.state.enums.NodeState;
+import org.apache.shardingsphere.infra.yaml.engine.YamlEngine;
+import org.apache.shardingsphere.ui.servcie.ClusterService;
+import org.apache.shardingsphere.ui.servcie.RegistryCenterService;
+import org.springframework.stereotype.Service;
+import org.springframework.util.StringUtils;
+
+import javax.annotation.Resource;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Implementation of cluster service.
+ */
+@Service
+@Slf4j
+public final class ClusterServiceImpl implements ClusterService {
+    
+    @Resource
+    private RegistryCenterService registryCenterService;
+    
+    @Override
+    public Map<String, InstanceState> loadAllInstanceStates() {
+        List<String> instanceIds = registryCenterService.getActivatedRegistryCenter()
+                .getChildrenKeys(registryCenterService.getActivatedStateNode().getInstanceNodeRootPath());
+        Map<String, InstanceState> instanceStateMap = new HashMap<>();
+        instanceIds.forEach(each -> instanceStateMap.put(each, loadInstanceState(each)));
+        return instanceStateMap;
+    }
+    
+    private InstanceState loadInstanceState(final String instanceId) {
+        String instanceStateData = registryCenterService.getActivatedRegistryCenter()
+                .get(registryCenterService.getActivatedStateNode().getInstancesNodeFullPath(instanceId));
+        if (StringUtils.isEmpty(instanceStateData)) {
+            log.error("can not load instance '{}' state data", instanceId);
+            return new InstanceState(NodeState.UNKNOWN, new HashMap<>());
+        }
+        return YamlEngine.unmarshal(instanceStateData, InstanceState.class);
+    }
+}

shardingsphere-ui/shardingsphere-ui-backend/src/main/java/org/apache/shardingsphere/ui/web/controller/ClusterStateController.java

+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You 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 org.apache.shardingsphere.ui.web.controller;
+
+import org.apache.shardingsphere.cluster.state.InstanceState;
+import org.apache.shardingsphere.ui.servcie.ClusterService;
+import org.apache.shardingsphere.ui.web.response.ResponseResult;
+import org.apache.shardingsphere.ui.web.response.ResponseResultUtil;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+/**
+ * RESTful API of cluster state.
+ */
+@RestController
+@RequestMapping("/api/cluster-state")
+public final class ClusterStateController {
+    
+    @Autowired
+    private ClusterService clusterService;
+    
+    @RequestMapping(value = "", method = RequestMethod.GET)
+    public ResponseResult<Map<String, InstanceState>> loadAllInstanceStates() {
+        return ResponseResultUtil.build(clusterService.loadAllInstanceStates());
+    }
+}