Fix the bug that error occurs in JMX metrics exporter when resource name contains '*' (#2992)

sentinel-extension/sentinel-metric-exporter/src/main/java/com/alibaba/csp/sentinel/metric/exporter/jmx/MetricBeanWriter.java

@@ -20,12 +20,13 @@ package com.alibaba.csp.sentinel.metric.exporter.jmx;
 import com.alibaba.csp.sentinel.config.SentinelConfig;
 import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.node.metric.MetricNode;
+import com.alibaba.csp.sentinel.util.StringUtil;
 
-import java.util.HashSet;
+import javax.management.ObjectName;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import java.util.Set;
+import java.util.regex.Pattern;
 
 /**
  * the metric bean writer, it provides {@link MetricBeanWriter#write} method for register the
@@ -40,6 +41,8 @@ public class MetricBeanWriter {
     private final MBeanRegistry mBeanRegistry = MBeanRegistry.getInstance();
     
     private static final String DEFAULT_APP_NAME = "sentinel-application";
+
+    private static final Pattern SPECIAL_CHARACTER_PATTERN = Pattern.compile("[*?=:\"\n]");
     
     /**
      * write the MetricNode value to MetricBean
@@ -68,7 +71,10 @@ public class MetricBeanWriter {
         long version = System.currentTimeMillis();
         // set or update the new metric value
         for (MetricNode metricNode : map.values()) {
-            final String mBeanName = "Sentinel:type=Metric,resource=" + metricNode.getResource()
+            // Fix JMX Metrics export error: https://github.com/alibaba/Sentinel/issues/2989
+            // Without escape, it will throw "cannot add mbean for pattern name" or "invalid character in value part of property" exception
+            String resourceName = escapeSpecialCharacter(metricNode.getResource());
+            final String mBeanName = "Sentinel:type=Metric,resource=" + resourceName
                     +",classification=" + metricNode.getClassification()
                     +",appName=" + appName;
             MetricBean metricBean = mBeanRegistry.findMBean(mBeanName);
@@ -95,4 +101,17 @@ public class MetricBeanWriter {
             }
         }
     }
+
+    /**
+     * escape only when arg has special character eg.(*,?,\n,\")
+     *
+     * @param resourceName need escape resource name
+     * @return escaped characters
+     */
+    public static String escapeSpecialCharacter(String resourceName) {
+        if (StringUtil.isBlank(resourceName) || !SPECIAL_CHARACTER_PATTERN.matcher(resourceName).find()) {
+            return resourceName;
+        }
+        return ObjectName.quote(resourceName);
+    }
 }

sentinel-extension/sentinel-metric-exporter/src/test/java/com/alibaba/cps/sentinel/metric/exporter/MetricBeanWriterTest.java

@@ -0,0 +1,60 @@
+/*
+ *  Copyright 1999-2022 Alibaba Group Holding Ltd.
+ *
+ *  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.alibaba.cps.sentinel.metric.exporter;
+
+import com.alibaba.csp.sentinel.metric.exporter.jmx.MetricBeanWriter;
+import org.junit.Assert;
+import org.junit.Test;
+
+/**
+ * {@link com.alibaba.csp.sentinel.metric.exporter.jmx.MetricBeanWriter} unit test
+ *
+ * @author quguai
+ * @date 2022/12/7 21:33
+ */
+public class MetricBeanWriterTest {
+
+    @Test
+    public void testEscapeSpecialCharacter() {
+        String character = MetricBeanWriter.escapeSpecialCharacter(null);
+        Assert.assertNull(character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter("");
+        Assert.assertEquals("", character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter("sentinel");
+        Assert.assertEquals("sentinel", character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter("*sentinel");
+        Assert.assertEquals("\"\\*sentinel\"", character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter("?sentinel");
+        Assert.assertEquals("\"\\?sentinel\"", character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter("\nsentinel");
+        Assert.assertEquals("\"\\nsentinel\"", character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter("\"sentinel");
+        Assert.assertEquals("\"\\\"sentinel\"", character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter("=sentinel");
+        Assert.assertEquals("\"=sentinel\"", character);
+
+        character = MetricBeanWriter.escapeSpecialCharacter(":sentinel");
+        Assert.assertEquals("\":sentinel\"", character);
+    }
+}