[OSPP]Support Kubernetes ConfigMap for Apollo java, golang client

CHANGES.md

@@ -5,7 +5,8 @@ Release Notes.
 Apollo Java 2.4.0
 
 ------------------
-* 
+* [Feature Support Kubernetes ConfigMap cache for Apollo java, golang client](https://github.com/apolloconfig/apollo-java/pull/79)
+
 
 ------------------
 All issues and pull requests are [here](https://github.com/apolloconfig/apollo-java/milestone/4?closed=1)

apollo-client/pom.xml

@@ -98,5 +98,10 @@
 			<scope>test</scope>
 		</dependency>
 		<!-- end of test -->
+		<dependency>
+			<groupId>io.kubernetes</groupId>
+			<artifactId>client-java</artifactId>
+			<version>18.0.0</version>
+		</dependency>
 	</dependencies>
 </project>

apollo-client/src/main/java/com/ctrip/framework/apollo/Kubernetes/KubernetesManager.java

@@ -0,0 +1,177 @@
+/*
+ * Copyright 2022 Apollo Authors
+ *
+ * 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 com.ctrip.framework.apollo.Kubernetes;
+
+import io.kubernetes.client.openapi.ApiClient;
+import io.kubernetes.client.openapi.apis.CoreV1Api;
+import io.kubernetes.client.openapi.Configuration;
+import io.kubernetes.client.openapi.models.*;
+import io.kubernetes.client.util.Config;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Service;
+
+import javax.annotation.PostConstruct;
+import java.util.Map;
+
+@Service
+public class KubernetesManager {
+    private ApiClient client;
+    private CoreV1Api coreV1Api;
+
+    private final Logger log = LoggerFactory.getLogger(this.getClass());
+
+    @PostConstruct
+    public void initClient() {
+        try {
+            client = Config.defaultClient();
+            Configuration.setDefaultApiClient(client);
+            coreV1Api = new CoreV1Api(client);
+
+        } catch (Exception e) {
+            String errorMessage = "Failed to initialize Kubernetes client: " + e.getMessage();
+            log.error(errorMessage, e);
+            throw new RuntimeException(errorMessage, e);
+        }
+    }
+
+    /**
+     * Creates a Kubernetes ConfigMap.
+     *
+     * @param configMapNamespace the namespace of the ConfigMap
+     * @param name               the name of the ConfigMap
+     * @param data               the data to be stored in the ConfigMap
+     * @return the name of the created ConfigMap
+     * @throws RuntimeException if an error occurs while creating the ConfigMap
+     */
+    public String createConfigMap(String configMapNamespace, String name, Map<String, String> data) {
+        if (configMapNamespace == null || configMapNamespace.isEmpty() || name == null || name.isEmpty()) {
+            log.error("create config map failed due to null or empty parameter: configMapNamespace={}, name={}", configMapNamespace, name);
+            throw new IllegalArgumentException("ConfigMap namespace and name cannot be null or empty");
+        }
+        V1ConfigMap configMap = new V1ConfigMap()
+                .metadata(new V1ObjectMeta().name(name).namespace(configMapNamespace))
+                .data(data);
+        try {
+            coreV1Api.createNamespacedConfigMap(configMapNamespace, configMap, null, null, null, null);
+            return name;
+        } catch (Exception e) {
+            throw new RuntimeException("Failed to create ConfigMap: " + e.getMessage(), e);
+        }
+    }
+
+    /**
+     * get value from config map
+     *
+     * @param configMapNamespace
+     * @param name               config map name (appId)
+     * @return configMap data(all key-value pairs in config map)
+     */
+    public String loadFromConfigMap(String configMapNamespace, String name) {
+        if (configMapNamespace == null || configMapNamespace.isEmpty() || name == null || name.isEmpty() ) {
+            String errorMessage = String.format("Parameters can not be null or empty, configMapNamespace: '%s', name: '%s'", configMapNamespace, name);
+            log.error(errorMessage);
+            throw new IllegalArgumentException(errorMessage);
+        }
+        try {
+            log.info("Starting to read ConfigMap: " + name);
+            V1ConfigMap configMap = coreV1Api.readNamespacedConfigMap(name, configMapNamespace, null);
+            if (configMap == null) {
+                throw new RuntimeException(String.format("ConfigMap does not exist, configMapNamespace: %s, name: %s", configMapNamespace, name));
+            }
+            Map<String, String> data = configMap.getData();
+            if (data != null && data.containsKey(name)) {
+                return data.get(name);
+            } else {
+                throw new RuntimeException(String.format("Specified key not found in ConfigMap: %s, configMapNamespace: %s, name: %s", name, configMapNamespace, name));
+            }
+        } catch (Exception e) {
+            throw new RuntimeException(String
+                    .format("get config map failed, configMapNamespace: %s, name: %s", configMapNamespace, name));
+        }
+    }
+
+    /**
+     * get value from config map
+     *
+     * @param configMapNamespace configMapNamespace
+     * @param name               config map name (appId)
+     * @param key                config map key (cluster+namespace)
+     * @return value(json string)
+     */
+    public String getValueFromConfigMap(String configMapNamespace, String name, String key) {
+        if (configMapNamespace == null || configMapNamespace.isEmpty() || name == null || name.isEmpty() || key == null || key.isEmpty()) {
+            log.error("Parameters can not be null or empty: configMapNamespace={}, name={}", configMapNamespace, name);
+            return null;
+        }
+        try {
+            V1ConfigMap configMap = coreV1Api.readNamespacedConfigMap(name, configMapNamespace, null);
+            if (configMap == null) {
+                throw new RuntimeException(String.format("ConfigMap does not exist, configMapNamespace: %s, name: %s", configMapNamespace, name));
+            }
+            if (!configMap.getData().containsKey(key)) {
+                throw new RuntimeException(String.format("Specified key not found in ConfigMap: %s, configMapNamespace: %s, name: %s", name, configMapNamespace, name));
+            }
+            return configMap.getData().get(key);
+        } catch (Exception e) {
+            return null;
+        }
+    }
+
+    /**
+     * update config map
+     *
+     * @param configMapNamespace
+     * @param name               config map name (appId)
+     * @param data               new data
+     * @return config map name
+     */
+    public String updateConfigMap(String configMapNamespace, String name, Map<String, String> data) {
+        if (configMapNamespace == null || configMapNamespace.isEmpty() || name == null || name.isEmpty() || data == null || data.isEmpty()) {
+            log.error("Parameters can not be null or empty: configMapNamespace={}, name={}", configMapNamespace, name);
+            return null;
+        }
+        try {
+            V1ConfigMap configMap = new V1ConfigMap().metadata(new V1ObjectMeta().name(name).namespace(configMapNamespace)).data(data);
+            coreV1Api.replaceNamespacedConfigMap(name, configMapNamespace, configMap, null, null, null, "fieldManagerValue");
+            return name;
+        } catch (Exception e) {
+            log.error("update config map failed", e);
+            return null;
+        }
+    }
+
+    /**
+     * check config map exist
+     *
+     * @param configMapNamespace config map namespace
+     * @param configMapName      config map name
+     * @return true if config map exist, false otherwise
+     */
+    public boolean checkConfigMapExist(String configMapNamespace, String configMapName) {
+        if (configMapNamespace == null || configMapNamespace.isEmpty() || configMapName == null || configMapName.isEmpty()) {
+            log.error("Parameters can not be null or empty: configMapNamespace={}, configMapName={}", configMapNamespace, configMapName);
+            return false;
+        }
+        try {
+            coreV1Api.readNamespacedConfigMap(configMapName, configMapNamespace, null);
+        } catch (Exception e) {
+            return false;
+        }
+        return true;
+    }
+}

apollo-client/src/main/java/com/ctrip/framework/apollo/enums/ConfigSourceType.java

@@ -22,7 +22,10 @@
  * @since 1.1.0
  */
 public enum ConfigSourceType {
-  REMOTE("Loaded from remote config service"), LOCAL("Loaded from local cache"), NONE("Load failed");
+  REMOTE("Loaded from remote config service"),
+  LOCAL("Loaded from local cache"),
+  CONFIGMAP("Loaded from k8s config map"),
+  NONE("Load failed");
 
   private final String description;