add event http receiver (#7406)

CHANGES.md

@@ -16,6 +16,7 @@ Release Notes.
 * Fix CVE-2021-35515, CVE-2021-35516, CVE-2021-35517, CVE-2021-36090. Upgrade org.apache.commons:commons-compress to
   1.21.
 * kubernetes java client upgrade from 12.0.1 to 13.0.0
+* Add `event` http receiver
 
 #### UI
 

docs/en/protocols/Log-Data-Protocol.md

@@ -45,7 +45,7 @@ Json log record example:
 
 ## HTTP API
 
-Report `json` format logs via HTTP API, the endpoint is http://<oap-address>:12800/v3/logs.
+Report `json` format logs via HTTP API, the endpoint is `http://<oap-address>:12800/v3/logs`.
 
 Json log record example:
 

docs/en/protocols/README.md

@@ -50,6 +50,26 @@ the following key information:
 
 The protocol is used to report events to the backend. The [doc](../concepts-and-designs/event.md) introduces the definition of an event, and [the protocol repository](https://github.com/apache/skywalking-data-collect-protocol/blob/master/event) defines gRPC services and message formats of events.
 
+Report `JSON` format events via HTTP API, the endpoint is `http://<oap-address>:12800/v3/events`.
+JSON event record example:
+```json
+[
+    {
+        "uuid": "f498b3c0-8bca-438d-a5b0-3701826ae21c",
+        "source": {
+            "service": "SERVICE-A",
+            "instance": "INSTANCE-1"
+        },
+        "name": "Reboot",
+        "type": "Normal",
+        "message": "App reboot.",
+        "parameters": {},
+        "startTime": 1628044330000,
+        "endTime": 1628044331000
+    }
+]
+```
+
 ### 3rd-party instrument protocol
 3rd-party instrument protocols are not defined by SkyWalking. They are just protocols/formats with which SkyWalking is compatible, and SkyWalking could receive them from their existing libraries. SkyWalking starts with supporting Zipkin v1, v2 data formats.
 

oap-server/server-receiver-plugin/skywalking-event-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/event/EventModuleProvider.java

@@ -21,11 +21,13 @@ package org.apache.skywalking.oap.server.receiver.event;
 import org.apache.skywalking.oap.server.analyzer.event.EventAnalyzerModule;
 import org.apache.skywalking.oap.server.core.CoreModule;
 import org.apache.skywalking.oap.server.core.server.GRPCHandlerRegister;
+import org.apache.skywalking.oap.server.core.server.JettyHandlerRegister;
 import org.apache.skywalking.oap.server.library.module.ModuleConfig;
 import org.apache.skywalking.oap.server.library.module.ModuleDefine;
 import org.apache.skywalking.oap.server.library.module.ModuleProvider;
 import org.apache.skywalking.oap.server.library.module.ServiceNotProvidedException;
 import org.apache.skywalking.oap.server.receiver.event.grpc.EventGrpcServiceHandler;
+import org.apache.skywalking.oap.server.receiver.event.rest.EventRestServiceHandler;
 import org.apache.skywalking.oap.server.receiver.sharing.server.SharingServerModule;
 
 public class EventModuleProvider extends ModuleProvider {
@@ -56,6 +58,10 @@ public class EventModuleProvider extends ModuleProvider {
                                                                     .getService(GRPCHandlerRegister.class);
         final EventGrpcServiceHandler eventGRPCServiceHandler = new EventGrpcServiceHandler(getManager());
         grpcHandlerRegister.addHandler(eventGRPCServiceHandler);
+        JettyHandlerRegister jettyHandlerRegister = getManager().find(SharingServerModule.NAME)
+                                                                .provider()
+                                                                .getService(JettyHandlerRegister.class);
+        jettyHandlerRegister.addHandler(new EventRestServiceHandler(getManager()));
     }
 
     @Override

oap-server/server-receiver-plugin/skywalking-event-receiver-plugin/src/main/java/org/apache/skywalking/oap/server/receiver/event/rest/EventRestServiceHandler.java

@@ -0,0 +1,91 @@
+/*
+ * 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.receiver.event.rest;
+
+import com.google.common.collect.Lists;
+import com.google.gson.Gson;
+import com.google.gson.JsonArray;
+import com.google.gson.JsonElement;
+import java.util.List;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.skywalking.apm.network.event.v3.Event;
+import org.apache.skywalking.oap.server.analyzer.event.EventAnalyzerModule;
+import org.apache.skywalking.oap.server.analyzer.event.EventAnalyzerService;
+import org.apache.skywalking.oap.server.library.module.ModuleManager;
+import org.apache.skywalking.oap.server.library.server.jetty.JettyHandler;
+import org.apache.skywalking.oap.server.library.util.ProtoBufJsonUtils;
+import org.apache.skywalking.oap.server.telemetry.TelemetryModule;
+import org.apache.skywalking.oap.server.telemetry.api.CounterMetrics;
+import org.apache.skywalking.oap.server.telemetry.api.HistogramMetrics;
+import org.apache.skywalking.oap.server.telemetry.api.MetricsCreator;
+import org.apache.skywalking.oap.server.telemetry.api.MetricsTag;
+
+@Slf4j
+public class EventRestServiceHandler extends JettyHandler {
+    private final HistogramMetrics histogram;
+
+    private final CounterMetrics errorCounter;
+
+    private final EventAnalyzerService eventAnalyzerService;
+
+    private final Gson gson = new Gson();
+
+    public EventRestServiceHandler(final ModuleManager manager) {
+        final MetricsCreator metricsCreator = manager.find(TelemetryModule.NAME)
+                                                     .provider()
+                                                     .getService(MetricsCreator.class);
+
+        eventAnalyzerService = manager.find(EventAnalyzerModule.NAME)
+                                      .provider()
+                                      .getService(EventAnalyzerService.class);
+
+        histogram = metricsCreator.createHistogramMetric(
+            "event_in_latency", "The process latency of event data",
+            new MetricsTag.Keys("protocol"), new MetricsTag.Values("http")
+        );
+        errorCounter = metricsCreator.createCounter(
+            "event_error_count", "The error number of event analysis",
+            new MetricsTag.Keys("protocol"), new MetricsTag.Values("http")
+        );
+    }
+
+    @Override
+    protected void doPost(final HttpServletRequest req, final HttpServletResponse resp) {
+        try (HistogramMetrics.Timer ignored = histogram.createTimer()) {
+            List<Event> events = Lists.newArrayList();
+            JsonArray array = gson.fromJson(req.getReader(), JsonArray.class);
+            for (JsonElement element : array) {
+                Event.Builder builder = Event.newBuilder();
+                ProtoBufJsonUtils.fromJSON(element.toString(), builder);
+                events.add(builder.build());
+            }
+
+            events.forEach(eventAnalyzerService::analyze);
+        } catch (Exception e) {
+            errorCounter.inc();
+            log.error(e.getMessage(), e);
+        }
+    }
+
+    @Override
+    public String pathSpec() {
+        return "/v3/events";
+    }
+}