Webui use register center to find routing server. and use searchClient to...

Webui use register center to find routing server. and use searchClient to search traceId. Waiting for integration test.

skywalking-webui/src/main/java/com/a/eye/skywalking/web/client/routing/SearchClient.java

 package com.a.eye.skywalking.web.client.routing;
 
+import com.a.eye.skywalking.network.grpc.QueryTask;
+import com.a.eye.skywalking.network.grpc.SearchResult;
+import com.a.eye.skywalking.network.grpc.TraceId;
 import com.a.eye.skywalking.network.grpc.client.TraceSearchClient;
+import com.a.eye.skywalking.web.dto.TraceNodeInfo;
 import com.a.eye.skywalking.web.dto.TraceNodesResult;
 
+import java.util.List;
 import java.util.concurrent.ThreadLocalRandom;
 
 /**
@@ -13,15 +18,31 @@ public class SearchClient {
 
     public SearchClient() {
         TraceSearchClient[] allSearchClients = RoutingServerWatcher.getAllSearchClient();
-
+        if ((allSearchClients.length == 0)) {
+            throw new RuntimeException("no active routing servers");
+        }
         client = allSearchClients[ThreadLocalRandom.current().nextInt(0, allSearchClients.length)];
     }
 
     public TraceNodesResult searchSpan(String traceId){
         String[] traceIdSegments = traceId.split(".");
+        TraceNodesResult traceNodesResult = new TraceNodesResult();
         if(traceIdSegments.length != 6){
-            return new TraceNodesResult();
+            return traceNodesResult;
+        }
+
+        TraceId.Builder builder = TraceId.newBuilder();
+        for (String traceIdSegment : traceIdSegments) {
+            builder.addSegments(Long.parseLong(traceIdSegment));
         }
-        return new TraceNodesResult();
+
+        QueryTask.Builder queryTaskBuilder = QueryTask.newBuilder().setTraceId(builder.build());
+        SearchResult result = client.search(queryTaskBuilder.build());
+
+        List<TraceNodeInfo> traceNodes = traceNodesResult.getResult();
+        result.getSpansList().forEach((span -> {
+            traceNodes.add(new TraceNodeInfo((span)));
+        }));
+        return traceNodesResult;
     }
 }