refactor: simplify the Accept http header process

docs/en/changes/changes.md

@@ -25,6 +25,7 @@
 * Storage: separate `SpanAttachedEventRecord` for SkyWalking trace and Zipkin trace.
 * [Break Change]BanyanDB: Setup new Group policy. 
 * Bump up commons-beanutils to 1.11.0.
+* Refactor: simplify the `Accept` http header process.
 
 #### UI
 

docs/en/status/query_cluster_nodes.md

@@ -18,22 +18,22 @@ This API is used to get the unified and effective TTL configurations.
     {
       "host": "10.0.12.23",
       "port": 11800,
-      "isSelf": true
+      "self": true
     },
     {
       "host": "10.0.12.25",
       "port": 11800,
-      "isSelf": false
+      "self": false
     },
     {
       "host": "10.0.12.37",
       "port": 11800,
-      "isSelf": false
+      "self": false
     }
   ]
 }
 ```
 
 The `nodes` list all the nodes in the cluster. The size of the list should be exactly same as your cluster setup.
 The `host` and `port` are the address of the OAP node, which are used for OAP nodes communicating with each other. The
-`isSelf` is a flag to indicate whether the node is the current node, others are remote nodes.
+`self` is a flag to indicate whether the node is the current node, others are remote nodes.

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/CoreModuleProvider.java

@@ -265,7 +265,7 @@ public void prepare() throws ServiceNotProvidedException, ModuleStartException {
         httpServer.initialize();
 
         this.registerServiceImplementation(ConfigService.class, new ConfigService(moduleConfig, this));
-        this.registerServiceImplementation(ServerStatusService.class, new ServerStatusService(getManager(), moduleConfig));
+        this.registerServiceImplementation(ServerStatusService.class, new ServerStatusService(getManager()));
         this.registerServiceImplementation(HierarchyDefinitionService.class, new HierarchyDefinitionService(moduleConfig));
         hierarchyService = new HierarchyService(getManager(), moduleConfig);
         this.registerServiceImplementation(HierarchyService.class, hierarchyService);

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/status/ServerStatusService.java

@@ -18,14 +18,11 @@
 
 package org.apache.skywalking.oap.server.core.status;
 
-import com.google.gson.Gson;
-import io.vavr.Tuple2;
-import java.util.ArrayList;
+import java.util.HashMap;
 import java.util.List;
 import java.util.concurrent.CopyOnWriteArrayList;
 import lombok.Getter;
 import lombok.RequiredArgsConstructor;
-import org.apache.skywalking.oap.server.core.CoreModuleConfig;
 import org.apache.skywalking.oap.server.library.module.ApplicationConfiguration;
 import org.apache.skywalking.oap.server.library.module.ModuleManager;
 import org.apache.skywalking.oap.server.library.module.Service;
@@ -43,7 +40,6 @@
 @RequiredArgsConstructor
 public class ServerStatusService implements Service {
     private final ModuleManager manager;
-    private final CoreModuleConfig moduleConfig;
     @Getter
     private BootingStatus bootingStatus = new BootingStatus();
     @Getter
@@ -98,7 +94,7 @@ public ConfigList dumpBootingConfigurations(String keywords4MaskingSecretsOfConf
         for (ApplicationConfiguration.ModuleConfiguration configuration : configurations) {
             final String moduleName = configuration.getModuleName();
             if (configuration.getProviders().size() == 1) {
-                configList.add(moduleName + ".provider", configuration.getProviders().keySet().iterator().next());
+                configList.put(moduleName + ".provider", configuration.getProviders().keySet().iterator().next());
             }
             configuration.getProviders().forEach(
                 (providerName, providerConfiguration) ->
@@ -109,41 +105,25 @@ public ConfigList dumpBootingConfigurations(String keywords4MaskingSecretsOfConf
                                     value = "******";
                                 }
                             }
-                            configList.add(moduleName + "." + providerName + "." + key, value.toString());
+                            configList.put(moduleName + "." + providerName + "." + key, value.toString());
                         }
                     )
             );
         }
         return configList;
     }
 
-    public static class ConfigList {
-        private final static Gson GSON = new Gson();
-        private List<Tuple2> configurations = new ArrayList<>(200);
-
-        public void add(String key, String value) {
-            configurations.add(new Tuple2<>(key, value));
-        }
-
+    public static class ConfigList extends HashMap<String, String> {
         @Override
         public String toString() {
             StringBuilder configList = new StringBuilder();
-            for (Tuple2 tuple : configurations) {
-                configList.append(tuple._1)
+            for (final var entry : this.entrySet()) {
+                configList.append(entry.getKey())
                           .append("=")
-                          .append(tuple._2)
+                          .append(entry.getValue())
                           .append("\n");
             }
             return configList.toString();
         }
-
-        public String toJsonString() {
-            return GSON.toJson(configurations.stream()
-                                             .collect(
-                                                 java.util.stream.Collectors.toMap(
-                                                     tuple -> tuple._1.toString(),
-                                                     tuple -> tuple._2.toString()
-                                                 )));
-        }
     }
 }

oap-server/server-core/src/main/java/org/apache/skywalking/oap/server/core/storage/ttl/TTLDefinition.java

@@ -18,19 +18,18 @@
 
 package org.apache.skywalking.oap.server.core.storage.ttl;
 
-import com.google.gson.Gson;
 import lombok.Data;
 
 /**
  * TTLDefinition defines the TTL of the data in the storage.
  */
 @Data
 public class TTLDefinition {
-    private final static Gson GSON = new Gson();
     private final MetricsTTL metrics;
     private final RecordsTTL records;
 
-    public String generateTTLDefinition() {
+    @Override
+    public String toString() {
         StringBuilder ttlDefinition = new StringBuilder();
         ttlDefinition.append("# Metrics TTL includes the definition of the TTL of the metrics-ish data in the storage,\n");
         ttlDefinition.append("# e.g.\n");
@@ -67,8 +66,4 @@ public String generateTTLDefinition() {
         ttlDefinition.append("records.browserErrorLog.cold=").append(records.getColdBrowserErrorLog()).append("\n");
         return ttlDefinition.toString();
     }
-
-    public String generateTTLDefinitionAsJSONStr() {
-        return GSON.toJson(this);
-    }
 }

oap-server/server-query-plugin/status-query-plugin/src/main/java/org/apache/skywalking/oap/query/debug/ClusterStatusQueryHandler.java

@@ -18,16 +18,18 @@
 
 package org.apache.skywalking.oap.query.debug;
 
-import com.google.gson.JsonArray;
-import com.google.gson.JsonObject;
 import com.linecorp.armeria.common.HttpRequest;
-import com.linecorp.armeria.common.HttpResponse;
-import com.linecorp.armeria.common.MediaType;
 import com.linecorp.armeria.server.annotation.ExceptionHandler;
 import com.linecorp.armeria.server.annotation.Get;
+import com.linecorp.armeria.server.annotation.ProducesJson;
+
 import lombok.extern.slf4j.Slf4j;
+
+import java.util.Map;
+import java.util.stream.Collectors;
+
 import org.apache.skywalking.oap.server.core.CoreModule;
-import org.apache.skywalking.oap.server.core.remote.client.Address;
+import org.apache.skywalking.oap.server.core.remote.client.RemoteClient;
 import org.apache.skywalking.oap.server.core.remote.client.RemoteClientManager;
 import org.apache.skywalking.oap.server.library.module.ModuleManager;
 
@@ -50,22 +52,15 @@ private RemoteClientManager getRemoteClientManager() {
         return remoteClientManager;
     }
 
+    @ProducesJson
     @Get("/status/cluster/nodes")
-    public HttpResponse buildClusterNodeList(HttpRequest request) {
-        JsonObject clusterInfo = new JsonObject();
-
-        JsonArray nodeList = new JsonArray();
-        clusterInfo.add("nodes", nodeList);
-        getRemoteClientManager().getRemoteClient().stream().map(c -> {
-            final Address address = c.getAddress();
-            JsonObject node = new JsonObject();
-            node.addProperty("host", address.getHost());
-            node.addProperty("port", address.getPort());
-            node.addProperty("isSelf", address.isSelf());
-            return node;
-        }).forEach(nodeList::add);
-
-        return HttpResponse.of(MediaType.JSON_UTF_8, clusterInfo.toString());
+    public Map<String, ?> buildClusterNodeList(HttpRequest request) {
+        return Map.of(
+            "nodes", 
+            getRemoteClientManager().getRemoteClient()
+                                    .stream()
+                                    .map(RemoteClient::getAddress)
+                                    .collect(Collectors.toList())
+        );
     }
-
 }

oap-server/server-query-plugin/status-query-plugin/src/main/java/org/apache/skywalking/oap/query/debug/DebuggingHTTPHandler.java

@@ -26,12 +26,14 @@
 import com.google.common.reflect.TypeToken;
 import com.google.gson.Gson;
 import com.linecorp.armeria.common.AggregatedHttpResponse;
-import com.linecorp.armeria.common.HttpHeaderNames;
 import com.linecorp.armeria.common.HttpRequest;
 import com.linecorp.armeria.server.annotation.Default;
 import com.linecorp.armeria.server.annotation.ExceptionHandler;
 import com.linecorp.armeria.server.annotation.Get;
 import com.linecorp.armeria.server.annotation.Param;
+import com.linecorp.armeria.server.annotation.ProducesJson;
+import com.linecorp.armeria.server.annotation.ProducesText;
+
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -83,6 +85,7 @@
 import org.apache.skywalking.oap.server.core.query.type.debugging.DebuggingTrace;
 import org.apache.skywalking.oap.server.core.query.type.debugging.DebuggingTraceContext;
 import org.apache.skywalking.oap.server.core.status.ServerStatusService;
+import org.apache.skywalking.oap.server.core.status.ServerStatusService.ConfigList;
 import org.apache.skywalking.oap.server.library.module.ModuleManager;
 import zipkin2.Span;
 
@@ -110,14 +113,11 @@ public DebuggingHTTPHandler(final ModuleManager manager, final StatusQueryConfig
         this.logQuery = new LogQuery(manager);
     }
 
+    @ProducesText
+    @ProducesJson
     @Get("/debugging/config/dump")
-    public String dumpConfigurations(HttpRequest request) {
-        final String acceptHeader = request.headers().get(HttpHeaderNames.ACCEPT);
-        if (acceptHeader != null && acceptHeader.toLowerCase().contains("application/json")) {
-            return serverStatusService.dumpBootingConfigurations(config.getKeywords4MaskingSecretsOfConfig())
-                                      .toJsonString();
-        }
-        return serverStatusService.dumpBootingConfigurations(config.getKeywords4MaskingSecretsOfConfig()).toString();
+    public ConfigList dumpConfigurations(HttpRequest request) {
+        return serverStatusService.dumpBootingConfigurations(config.getKeywords4MaskingSecretsOfConfig());
     }
 
     @SneakyThrows

oap-server/server-query-plugin/status-query-plugin/src/main/java/org/apache/skywalking/oap/query/debug/TTLConfigQueryHandler.java

@@ -18,15 +18,15 @@
 
 package org.apache.skywalking.oap.query.debug;
 
-import com.linecorp.armeria.common.HttpHeaderNames;
-import com.linecorp.armeria.common.HttpRequest;
-import com.linecorp.armeria.common.HttpResponse;
-import com.linecorp.armeria.common.MediaType;
 import com.linecorp.armeria.server.annotation.ExceptionHandler;
 import com.linecorp.armeria.server.annotation.Get;
+import com.linecorp.armeria.server.annotation.ProducesJson;
+import com.linecorp.armeria.server.annotation.ProducesText;
+
 import lombok.extern.slf4j.Slf4j;
 import org.apache.skywalking.oap.server.core.CoreModule;
 import org.apache.skywalking.oap.server.core.query.TTLStatusQuery;
+import org.apache.skywalking.oap.server.core.storage.ttl.TTLDefinition;
 import org.apache.skywalking.oap.server.library.module.ModuleManager;
 
 @Slf4j
@@ -48,12 +48,10 @@ private TTLStatusQuery getTTLStatusQuery() {
         return ttlStatusQuery;
     }
 
+    @ProducesText
+    @ProducesJson
     @Get("/status/config/ttl")
-    public HttpResponse affectedTTLConfigurations(HttpRequest request) {
-        final String acceptHeader = request.headers().get(HttpHeaderNames.ACCEPT);
-        if (acceptHeader != null && acceptHeader.toLowerCase().contains("application/json")) {
-            return HttpResponse.of(MediaType.JSON_UTF_8, getTTLStatusQuery().getTTL().generateTTLDefinitionAsJSONStr());
-        }
-        return HttpResponse.of(MediaType.PLAIN_TEXT_UTF_8, getTTLStatusQuery().getTTL().generateTTLDefinition());
+    public TTLDefinition effectiveTTLConfigurations() {
+        return getTTLStatusQuery().getTTL();
     }
 }

oap-server/server-tools/profile-exporter/tool-profile-snapshot-server-mock/src/main/java/org/apache/skywalking/oap/server/tool/profile/core/MockCoreModuleProvider.java

@@ -137,7 +137,7 @@ public void prepare() throws ServiceNotProvidedException, ModuleStartException {
 
         CoreModuleConfig moduleConfig = new CoreModuleConfig();
         this.registerServiceImplementation(ConfigService.class, new ConfigService(moduleConfig, this));
-        this.registerServiceImplementation(ServerStatusService.class, new ServerStatusService(getManager(), moduleConfig));
+        this.registerServiceImplementation(ServerStatusService.class, new ServerStatusService(getManager()));
         moduleConfig.setEnableHierarchy(false);
         this.registerServiceImplementation(HierarchyDefinitionService.class, new HierarchyDefinitionService(moduleConfig));
         this.registerServiceImplementation(HierarchyService.class, new HierarchyService(getManager(), moduleConfig));