kezhenxu94 commented on a change in pull request #4344: supprt gRPC alarm hook.
URL: https://github.com/apache/skywalking/pull/4344#discussion_r377711492
 
 

 ##########
 File path: 
oap-server/server-alarm-plugin/src/main/java/org/apache/skywalking/oap/server/core/alarm/provider/grpc/GRPCCallback.java
 ##########
 @@ -0,0 +1,145 @@
+/*
+ * 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.skywalking.oap.server.core.alarm.provider.grpc;
+
+import io.grpc.stub.StreamObserver;
+import java.util.List;
+import java.util.concurrent.TimeUnit;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.skywalking.oap.server.core.alarm.AlarmCallback;
+import org.apache.skywalking.oap.server.core.alarm.AlarmMessage;
+import org.apache.skywalking.oap.server.core.alarm.grpc.AlarmServiceGrpc;
+import org.apache.skywalking.oap.server.core.alarm.grpc.Response;
+import org.apache.skywalking.oap.server.core.alarm.provider.AlarmRulesWatcher;
+import org.apache.skywalking.oap.server.core.exporter.ExportStatus;
+import org.apache.skywalking.oap.server.library.client.grpc.GRPCClient;
+
+/**
+ * Use SkyWalking alarm grpc API call a remote methods.
+ */
+@Slf4j
+public class GRPCCallback implements AlarmCallback {
+
+    private AlarmRulesWatcher alarmRulesWatcher;
+
+    private GRPCAlarmSetting alarmSetting;
+
+    private AlarmServiceGrpc.AlarmServiceStub alarmServiceStub;
+
+    private GRPCClient grpcClient;
+
+    public GRPCCallback(AlarmRulesWatcher alarmRulesWatcher) {
+        this.alarmRulesWatcher = alarmRulesWatcher;
+        alarmSetting = alarmRulesWatcher.getGrpchookSetting();
+
+        if (alarmSetting != null) {
+            grpcClient = new GRPCClient(alarmSetting.getTargetHost(), 
alarmSetting.getTargetPort());
+        }
+    }
+
+    @Override
+    public void doAlarm(List<AlarmMessage> alarmMessage) {
+
+        if (alarmSetting == null) {
+            return;
+        }
+
+        // recreate gRPC client if host and port configuration changed.
+        onGRPCAlarmSettingUpdated(alarmRulesWatcher.getGrpchookSetting());
+
+        ExportStatus status = new ExportStatus();
+
+        
StreamObserver<org.apache.skywalking.oap.server.core.alarm.grpc.AlarmMessage> 
streamObserver =
+            alarmServiceStub.withDeadlineAfter(10, 
TimeUnit.SECONDS).doAlarm(new StreamObserver<Response>() {
+                @Override
+                public void onNext(Response response) {
+                    // ignore empty response
+                }
+
+                @Override
+                public void onError(Throwable throwable) {
+                    status.done();
+                    if (log.isDebugEnabled()) {
+                        log.debug("Send alarm message failed: {}", 
throwable.getMessage());
+                    }
+                }
+
+                @Override
+                public void onCompleted() {
+                    status.done();
+                    if (log.isDebugEnabled()) {
+                        log.debug("Send alarm message successful.");
+                    }
+                }
+            });
+
+        alarmMessage.forEach(message -> {
+            
org.apache.skywalking.oap.server.core.alarm.grpc.AlarmMessage.Builder builder =
+                
org.apache.skywalking.oap.server.core.alarm.grpc.AlarmMessage.newBuilder();
+
+            builder.setScopeId(message.getScopeId());
+            builder.setScope(message.getScope());
+            builder.setName(message.getName());
+            builder.setId0(message.getId0());
+            builder.setId1(message.getId1());
+            builder.setRuleName(message.getRuleName());
+            builder.setAlarmMessage(message.getAlarmMessage());
+            builder.setStartTime(message.getStartTime());
+
+            streamObserver.onNext(builder.build());
+        });
+
+        streamObserver.onCompleted();
+
+        long sleepTime = 0;
+        long cycle = 100L;
+        /**
+         * For memory safe of oap, we must wait for the peer confirmation.
+         */
+        while (!status.isDone()) {
 
 Review comment:
   > ExportStatus is in exporter, why use it in the alarm?
   
   Maybe a `CountDownLatch` is enough to make it more convenient and safe (in 
terms of thread visibility)?

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