Refinement for heartbeat logic in sentinel-transport related module (#312)

- Code refinement for heartbeat component in transport related module
- Add remove support of `SentinelConfig`

Signed-off-by: Eric Zhao <sczyh16@gmail.com>

sentinel-core/src/main/java/com/alibaba/csp/sentinel/config/SentinelConfig.java

@@ -24,6 +24,7 @@ import java.util.concurrent.ConcurrentHashMap;
 import com.alibaba.csp.sentinel.log.LogBase;
 import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.util.AppNameUtil;
+import com.alibaba.csp.sentinel.util.AssertUtil;
 import com.alibaba.csp.sentinel.util.StringUtil;
 
 /**
@@ -102,14 +103,24 @@ public class SentinelConfig {
      * @return the config value.
      */
     public static String getConfig(String key) {
+        AssertUtil.notNull(key, "key cannot be null");
         return props.get(key);
     }
 
     public static void setConfig(String key, String value) {
+        AssertUtil.notNull(key, "key cannot be null");
+        AssertUtil.notNull(value, "value cannot be null");
         props.put(key, value);
     }
 
+    public static String removeConfig(String key) {
+        AssertUtil.notNull(key, "key cannot be null");
+        return props.remove(key);
+    }
+
     public static void setConfigIfAbsent(String key, String value) {
+        AssertUtil.notNull(key, "key cannot be null");
+        AssertUtil.notNull(value, "value cannot be null");
         String v = props.get(key);
         if (v == null) {
             props.put(key, value);

sentinel-transport/sentinel-transport-common/pom.xml

@@ -20,10 +20,16 @@
             <groupId>com.alibaba</groupId>
             <artifactId>fastjson</artifactId>
         </dependency>
+
         <dependency>
         	<groupId>junit</groupId>
         	<artifactId>junit</artifactId>
         	<scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <scope>test</scope>
+        </dependency>
     </dependencies>
 </project>

sentinel-transport/sentinel-transport-common/src/main/java/com/alibaba/csp/sentinel/transport/HeartbeatSender.java

@@ -16,8 +16,8 @@
 package com.alibaba.csp.sentinel.transport;
 
 /**
- * Heartbeat interface. Sentinel core is responsible for invoking {@link #sendHeartbeat()}
- * at every {@link #intervalMs()} interval.
+ * The heartbeat sender which is responsible for sending heartbeat to remote dashboard
+ * periodically per {@code interval}.
  *
  * @author leyou
  * @author Eric Zhao
@@ -30,14 +30,15 @@ public interface HeartbeatSender {
      * at every {@link #intervalMs()} interval.
      *
      * @return whether heartbeat is successfully send.
-     * @throws Exception
+     * @throws Exception if error occurs
      */
     boolean sendHeartbeat() throws Exception;
 
     /**
-     * Millisecond interval of every {@link #sendHeartbeat()}
+     * Default interval in milliseconds of the sender. It would take effect only when
+     * the heartbeat interval is not configured in Sentinel config property.
      *
-     * @return millisecond interval.
+     * @return default interval of the sender in milliseconds
      */
     long intervalMs();
 }

sentinel-transport/sentinel-transport-common/src/main/java/com/alibaba/csp/sentinel/transport/config/TransportConfig.java

@@ -16,6 +16,7 @@
 package com.alibaba.csp.sentinel.transport.config;
 
 import com.alibaba.csp.sentinel.config.SentinelConfig;
+import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.util.HostNameUtil;
 import com.alibaba.csp.sentinel.util.StringUtil;
 
@@ -31,9 +32,19 @@ public class TransportConfig {
 
     private static int runtimePort = -1;
 
+    /**
+     * Get heartbeat interval in milliseconds.
+     *
+     * @return heartbeat interval in milliseconds if exists, or null if not configured or invalid config
+     */
     public static Long getHeartbeatIntervalMs() {
         String interval = SentinelConfig.getConfig(HEARTBEAT_INTERVAL_MS);
-        return interval == null ? null : Long.parseLong(interval);
+        try {
+            return interval == null ? null : Long.parseLong(interval);
+        } catch (Exception ex) {
+            RecordLog.warn("[TransportConfig] Failed to parse heartbeat interval: " + interval);
+            return null;
+        }
     }
 
     /**

sentinel-transport/sentinel-transport-common/src/main/java/com/alibaba/csp/sentinel/transport/init/HeartbeatSenderInitFunc.java

@@ -22,6 +22,7 @@ import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
 
 import com.alibaba.csp.sentinel.concurrent.NamedThreadFactory;
+import com.alibaba.csp.sentinel.config.SentinelConfig;
 import com.alibaba.csp.sentinel.init.InitFunc;
 import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.transport.HeartbeatSender;
@@ -37,15 +38,12 @@ public class HeartbeatSenderInitFunc implements InitFunc {
     private static ScheduledExecutorService pool = Executors.newScheduledThreadPool(2,
         new NamedThreadFactory("sentinel-heartbeat-send-task", true));
 
+    private boolean validHeartbeatInterval(Long interval) {
+        return interval != null && interval > 0;
+    }
+
     @Override
-    public void init() throws Exception {
-        long heartBeatInterval = -1;
-        try {
-            heartBeatInterval = TransportConfig.getHeartbeatIntervalMs();
-            RecordLog.info("system property heartbeat interval set: " + heartBeatInterval);
-        } catch (Exception ex) {
-            RecordLog.info("Parse heartbeat interval failed, use that in code, " + ex.getMessage());
-        }
+    public void init() {
         ServiceLoader<HeartbeatSender> loader = ServiceLoader.load(HeartbeatSender.class);
         Iterator<HeartbeatSender> iterator = loader.iterator();
         if (iterator.hasNext()) {
@@ -53,24 +51,42 @@ public class HeartbeatSenderInitFunc implements InitFunc {
             if (iterator.hasNext()) {
                 throw new IllegalStateException("Only single heartbeat sender can be scheduled");
             } else {
-                long interval = sender.intervalMs();
-                if (heartBeatInterval != -1) {
-                    interval = heartBeatInterval;
-                }
-                pool.scheduleAtFixedRate(new Runnable() {
-                    @Override
-                    public void run() {
-                        try {
-                            sender.sendHeartbeat();
-                        } catch (Throwable e) {
-                            e.printStackTrace();
-                            RecordLog.info("[HeartbeatSender] Send heartbeat error", e);
-                        }
-                    }
-                }, 10000, interval, TimeUnit.MILLISECONDS);
-                RecordLog.info("[HeartbeatSenderInit] HeartbeatSender started: "
-                    + sender.getClass().getCanonicalName());
+                long interval = retrieveInterval(sender);
+                setIntervalIfNotExists(interval);
+                scheduleHeartbeatTask(sender, interval);
             }
         }
     }
+
+    private void setIntervalIfNotExists(long interval) {
+        SentinelConfig.setConfig(TransportConfig.HEARTBEAT_INTERVAL_MS, String.valueOf(interval));
+    }
+
+    long retrieveInterval(/*@NonNull*/ HeartbeatSender sender) {
+        Long intervalInConfig = TransportConfig.getHeartbeatIntervalMs();
+        if (validHeartbeatInterval(intervalInConfig)) {
+            RecordLog.info("[HeartbeatSenderInit] Using heartbeat interval in Sentinel config property: " + intervalInConfig);
+            return intervalInConfig;
+        } else {
+            long senderInterval = sender.intervalMs();
+            RecordLog.info("[HeartbeatSenderInit] Heartbeat interval not configured in config property or invalid, "
+                + "using sender default: " + senderInterval);
+            return senderInterval;
+        }
+    }
+
+    private void scheduleHeartbeatTask(/*@NonNull*/ final HeartbeatSender sender, /*@Valid*/ long interval) {
+        pool.scheduleAtFixedRate(new Runnable() {
+            @Override
+            public void run() {
+                try {
+                    sender.sendHeartbeat();
+                } catch (Throwable e) {
+                    RecordLog.warn("[HeartbeatSender] Send heartbeat error", e);
+                }
+            }
+        }, 5000, interval, TimeUnit.MILLISECONDS);
+        RecordLog.info("[HeartbeatSenderInit] HeartbeatSender started: "
+            + sender.getClass().getCanonicalName());
+    }
 }

sentinel-transport/sentinel-transport-common/src/test/java/com/alibaba/csp/sentinel/transport/config/TransportConfigTest.java

@@ -1,25 +1,67 @@
+/*
+ * Copyright 1999-2018 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.csp.sentinel.transport.config;
 
 import com.alibaba.csp.sentinel.config.SentinelConfig;
+import com.alibaba.csp.sentinel.util.StringUtil;
+
+import org.junit.After;
+import org.junit.Before;
 import org.junit.Test;
 
 import static org.junit.Assert.*;
 
 public class TransportConfigTest {
 
+    @Before
+    public void setUp() throws Exception {
+        SentinelConfig.removeConfig(TransportConfig.HEARTBEAT_INTERVAL_MS);
+        SentinelConfig.removeConfig(TransportConfig.HEARTBEAT_CLIENT_IP);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        SentinelConfig.removeConfig(TransportConfig.HEARTBEAT_INTERVAL_MS);
+        SentinelConfig.removeConfig(TransportConfig.HEARTBEAT_CLIENT_IP);
+    }
+
     @Test
-    public void getClientIp() {
-        //config heartbeat client ip
-        System.setProperty(TransportConfig.HEARTBEAT_CLIENT_IP, "10.10.10.10");
+    public void testGetHeartbeatInterval() {
+        long interval = 20000;
+        assertNull(TransportConfig.getHeartbeatIntervalMs());
+        // Set valid interval.
+        SentinelConfig.setConfig(TransportConfig.HEARTBEAT_INTERVAL_MS, String.valueOf(interval));
+        assertEquals(new Long(interval), TransportConfig.getHeartbeatIntervalMs());
+        // Set invalid interval.
+        SentinelConfig.setConfig(TransportConfig.HEARTBEAT_INTERVAL_MS, "Sentinel");
+        assertNull(TransportConfig.getHeartbeatIntervalMs());
+    }
+
+    @Test
+    public void testGetHeartbeatClientIp() {
+        String clientIp = "10.10.10.10";
+        SentinelConfig.setConfig(TransportConfig.HEARTBEAT_CLIENT_IP, clientIp);
+        // Set heartbeat client ip to system property.
         String ip = TransportConfig.getHeartbeatClientIp();
 
         assertNotNull(ip);
-        assertEquals(ip, "10.10.10.10");
+        assertEquals(clientIp, ip);
 
-        //no heartbeat client ip
+        // Set no heartbeat client ip.
         SentinelConfig.setConfig(TransportConfig.HEARTBEAT_CLIENT_IP, "");
-        ip = TransportConfig.getHeartbeatClientIp();
-        assertNotNull(ip);
-
+        assertTrue(StringUtil.isNotEmpty(TransportConfig.getHeartbeatClientIp()));
     }
 }

sentinel-transport/sentinel-transport-common/src/test/java/com/alibaba/csp/sentinel/transport/init/HeartbeatSenderInitFuncTest.java

@@ -0,0 +1,63 @@
+/*
+ * Copyright 1999-2018 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.csp.sentinel.transport.init;
+
+import com.alibaba.csp.sentinel.config.SentinelConfig;
+import com.alibaba.csp.sentinel.transport.HeartbeatSender;
+import com.alibaba.csp.sentinel.transport.config.TransportConfig;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+import static org.mockito.Mockito.*;
+
+/**
+ * @author Eric Zhao
+ */
+public class HeartbeatSenderInitFuncTest {
+
+    @Before
+    public void setUp() throws Exception {
+        SentinelConfig.removeConfig(TransportConfig.HEARTBEAT_INTERVAL_MS);
+    }
+
+    @After
+    public void tearDown() throws Exception {
+        SentinelConfig.removeConfig(TransportConfig.HEARTBEAT_INTERVAL_MS);
+    }
+
+    @Test
+    public void testRetrieveInterval() {
+        HeartbeatSender sender = mock(HeartbeatSender.class);
+
+        long senderInterval = 5666;
+        long configInterval = 6777;
+
+        when(sender.intervalMs()).thenReturn(senderInterval);
+
+        HeartbeatSenderInitFunc func = new HeartbeatSenderInitFunc();
+        assertEquals(senderInterval, func.retrieveInterval(sender));
+
+        // Invalid interval.
+        SentinelConfig.setConfig(TransportConfig.HEARTBEAT_INTERVAL_MS, "-1");
+        assertEquals(senderInterval, func.retrieveInterval(sender));
+
+        SentinelConfig.setConfig(TransportConfig.HEARTBEAT_INTERVAL_MS, String.valueOf(configInterval));
+        assertEquals(configInterval, func.retrieveInterval(sender));
+    }
+}

sentinel-transport/sentinel-transport-netty-http/src/main/java/com/alibaba/csp/sentinel/transport/heartbeat/HttpHeartbeatSender.java

@@ -15,6 +15,9 @@
  */
 package com.alibaba.csp.sentinel.transport.heartbeat;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import com.alibaba.csp.sentinel.Constants;
 import com.alibaba.csp.sentinel.transport.config.TransportConfig;
 import com.alibaba.csp.sentinel.log.RecordLog;
@@ -23,6 +26,7 @@ import com.alibaba.csp.sentinel.util.HostNameUtil;
 import com.alibaba.csp.sentinel.transport.HeartbeatSender;
 import com.alibaba.csp.sentinel.util.PidUtil;
 import com.alibaba.csp.sentinel.util.StringUtil;
+import com.alibaba.csp.sentinel.util.function.Tuple2;
 
 import org.apache.http.client.config.RequestConfig;
 import org.apache.http.client.methods.CloseableHttpResponse;
@@ -51,24 +55,48 @@ public class HttpHeartbeatSender implements HeartbeatSender {
 
     public HttpHeartbeatSender() {
         this.client = HttpClients.createDefault();
-        String consoleServer = TransportConfig.getConsoleServer();
-        if (StringUtil.isEmpty(consoleServer)) {
-            RecordLog.info("[Heartbeat] Console server address is not configured!");
+        List<Tuple2<String, Integer>> dashboardList = parseDashboardList();
+        if (dashboardList == null || dashboardList.isEmpty()) {
+            RecordLog.info("[NettyHttpHeartbeatSender] No dashboard available");
         } else {
-            String consoleHost = consoleServer;
-            int consolePort = 80;
-            if (consoleServer.contains(",")) {
-                consoleHost = consoleServer.split(",")[0];
+            consoleHost = dashboardList.get(0).r1;
+            consolePort = dashboardList.get(0).r2;
+            RecordLog.info("[NettyHttpHeartbeatSender] Dashboard address parsed: <" + consoleHost + ':' + consolePort + ">");
+        }
+    }
+
+    private List<Tuple2<String, Integer>> parseDashboardList() {
+        List<Tuple2<String, Integer>> list = new ArrayList<Tuple2<String, Integer>>();
+        try {
+            String ipsStr = TransportConfig.getConsoleServer();
+            if (StringUtil.isBlank(ipsStr)) {
+                RecordLog.warn("[NettyHttpHeartbeatSender] Dashboard server address is not configured");
+                return list;
             }
-            if (consoleHost.contains(":")) {
-                String[] strs = consoleServer.split(":");
-                consoleHost = strs[0];
-                consolePort = Integer.parseInt(strs[1]);
+
+            for (String ipPortStr : ipsStr.split(",")) {
+                if (ipPortStr.trim().length() == 0) {
+                    continue;
+                }
+                ipPortStr = ipPortStr.trim();
+                if (ipPortStr.startsWith("http://")) {
+                    ipPortStr = ipPortStr.substring(7);
+                }
+                if (ipPortStr.startsWith(":")) {
+                    continue;
+                }
+                String[] ipPort = ipPortStr.trim().split(":");
+                int port = 8080;
+                if (ipPort.length > 1) {
+                    port = Integer.parseInt(ipPort[1].trim());
+                }
+                list.add(Tuple2.of(ipPort[0].trim(), port));
             }
-            this.consoleHost = consoleHost;
-            this.consolePort = consolePort;
+        } catch (Exception ex) {
+            RecordLog.warn("[NettyHttpHeartbeatSender] Parse dashboard list failed, current address list: " + list, ex);
+            ex.printStackTrace();
         }
-
+        return list;
     }
 
     @Override
@@ -76,8 +104,6 @@ public class HttpHeartbeatSender implements HeartbeatSender {
         if (StringUtil.isEmpty(consoleHost)) {
             return false;
         }
-        RecordLog.info(String.format("[Heartbeat] Sending heartbeat to %s:%d", consoleHost, consolePort));
-
         URIBuilder uriBuilder = new URIBuilder();
         uriBuilder.setScheme("http").setHost(consoleHost).setPort(consolePort)
             .setPath("/registry/machine")

sentinel-transport/sentinel-transport-simple-http/src/main/java/com/alibaba/csp/sentinel/transport/heartbeat/SimpleHttpHeartbeatSender.java

@@ -19,7 +19,6 @@ import java.net.InetSocketAddress;
 import java.util.ArrayList;
 import java.util.List;
 
-import com.alibaba.csp.sentinel.config.SentinelConfig;
 import com.alibaba.csp.sentinel.log.RecordLog;
 import com.alibaba.csp.sentinel.transport.HeartbeatSender;
 import com.alibaba.csp.sentinel.transport.config.TransportConfig;
@@ -54,9 +53,6 @@ public class SimpleHttpHeartbeatSender implements HeartbeatSender {
         List<InetSocketAddress> newAddrs = getDefaultConsoleIps();
         RecordLog.info("[SimpleHttpHeartbeatSender] Default console address list retrieved: " + newAddrs);
         this.addressList = newAddrs;
-        // Set interval config.
-        String interval = System.getProperty(TransportConfig.HEARTBEAT_INTERVAL_MS, String.valueOf(DEFAULT_INTERVAL));
-        SentinelConfig.setConfig(TransportConfig.HEARTBEAT_INTERVAL_MS, interval);
     }
 
     @Override
@@ -78,7 +74,7 @@ public class SimpleHttpHeartbeatSender implements HeartbeatSender {
                 return true;
             }
         } catch (Exception e) {
-            RecordLog.info("Failed to send heart beat to " + addr + " : ", e);
+            RecordLog.warn("[SimpleHttpHeartbeatSender] Failed to send heartbeat to " + addr + " : ", e);
         }
         return false;
     }
@@ -104,6 +100,7 @@ public class SimpleHttpHeartbeatSender implements HeartbeatSender {
         try {
             String ipsStr = TransportConfig.getConsoleServer();
             if (StringUtil.isEmpty(ipsStr)) {
+                RecordLog.warn("[NettyHttpHeartbeatSender] Dashboard server address not configured");
                 return newAddrs;
             }
 
@@ -122,7 +119,7 @@ public class SimpleHttpHeartbeatSender implements HeartbeatSender {
                 newAddrs.add(new InetSocketAddress(ipPort[0].trim(), port));
             }
         } catch (Exception ex) {
-            RecordLog.info("[SimpleHeartbeatSender] Parse console list failed, current address list: " + newAddrs, ex);
+            RecordLog.warn("[SimpleHeartbeatSender] Parse dashboard list failed, current address list: " + newAddrs, ex);
             ex.printStackTrace();
         }
         return newAddrs;