[ISSUE #1147]Add name server domain host support (#1175)

* Add nameserver host support

* Polish namespace auto obtain feature

client/src/main/java/org/apache/rocketmq/client/ClientConfig.java

@@ -18,12 +18,11 @@ package org.apache.rocketmq.client;
 
 import java.util.HashSet;
 import java.util.Set;
-
 import org.apache.commons.lang3.StringUtils;
-import org.apache.rocketmq.common.MixAll;
 import org.apache.rocketmq.common.UtilAll;
 import org.apache.rocketmq.common.message.MessageQueue;
 import org.apache.rocketmq.common.protocol.NamespaceUtil;
+import org.apache.rocketmq.common.utils.NameServerAddressUtils;
 import org.apache.rocketmq.remoting.common.RemotingUtil;
 import org.apache.rocketmq.remoting.netty.TlsSystemConfig;
 import org.apache.rocketmq.remoting.protocol.LanguageCode;
@@ -33,7 +32,7 @@ import org.apache.rocketmq.remoting.protocol.LanguageCode;
  */
 public class ClientConfig {
     public static final String SEND_MESSAGE_WITH_VIP_CHANNEL_PROPERTY = "com.rocketmq.sendMessageWithVIPChannel";
-    private String namesrvAddr = System.getProperty(MixAll.NAMESRV_ADDR_PROPERTY, System.getenv(MixAll.NAMESRV_ADDR_ENV));
+    private String namesrvAddr = NameServerAddressUtils.getNameServerAddresses();
     private String clientIP = RemotingUtil.getLocalAddress();
     private String instanceName = System.getProperty("rocketmq.client.name", "DEFAULT");
     private int clientCallbackExecutorThreads = Runtime.getRuntime().availableProcessors();
@@ -161,9 +160,16 @@ public class ClientConfig {
     }
 
     public String getNamesrvAddr() {
+        if (StringUtils.isNotEmpty(namesrvAddr) && NameServerAddressUtils.NAMESRV_ENDPOINT_PATTERN.matcher(namesrvAddr.trim()).matches()) {
+            return namesrvAddr.substring(NameServerAddressUtils.ENDPOINT_PREFIX.length());
+        }
         return namesrvAddr;
     }
 
+    /**
+     * Domain name mode access way does not support the delimiter(;), and only one domain name can be set.
+     * @param namesrvAddr name server address
+     */
     public void setNamesrvAddr(String namesrvAddr) {
         this.namesrvAddr = namesrvAddr;
     }
@@ -241,6 +247,15 @@ public class ClientConfig {
     }
 
     public String getNamespace() {
+        if (StringUtils.isNotEmpty(namespace)) {
+            return namespace;
+        }
+
+        if (StringUtils.isNotEmpty(this.namesrvAddr)) {
+            if (NameServerAddressUtils.validateInstanceEndpoint(namesrvAddr)) {
+                return NameServerAddressUtils.parseInstanceIdFromEndpoint(namesrvAddr);
+            }
+        }
         return namespace;
     }
 

common/src/main/java/org/apache/rocketmq/common/utils/NameServerAddressUtils.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.rocketmq.common.utils;
+
+import java.util.regex.Pattern;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.rocketmq.common.MixAll;
+
+public class NameServerAddressUtils {
+    public static final String INSTANCE_PREFIX = "MQ_INST_";
+    public static final String INSTANCE_REGEX = INSTANCE_PREFIX + "\\w+_\\w+";
+    public static final String ENDPOINT_PREFIX = "http://";
+    public static final Pattern NAMESRV_ENDPOINT_PATTERN = Pattern.compile("^" + ENDPOINT_PREFIX + ".*");
+    public static final Pattern INST_ENDPOINT_PATTERN = Pattern.compile("^" + ENDPOINT_PREFIX + INSTANCE_REGEX + "\\..*");
+
+    public static String getNameServerAddresses() {
+        return System.getProperty(MixAll.NAMESRV_ADDR_PROPERTY, System.getenv(MixAll.NAMESRV_ADDR_ENV));
+    }
+
+    public static boolean validateInstanceEndpoint(String endpoint) {
+        return INST_ENDPOINT_PATTERN.matcher(endpoint).matches();
+    }
+
+    public static String parseInstanceIdFromEndpoint(String endpoint) {
+        if (StringUtils.isEmpty(endpoint)) {
+            return null;
+        }
+        return endpoint.substring(ENDPOINT_PREFIX.length(), endpoint.indexOf('.'));
+    }
+}