Add host:port/peers to ContextCarrier.

skywalking-sniffer/skywalking-api/src/main/java/com/a/eye/skywalking/api/context/TracerContext.java

@@ -125,9 +125,16 @@ public final class TracerContext {
      */
     public void inject(ContextCarrier carrier) {
         carrier.setTraceSegmentId(this.segment.getTraceSegmentId());
-        carrier.setSpanId(this.activeSpan().getSpanId());
+        Span span = this.activeSpan();
+        carrier.setSpanId(span.getSpanId());
         carrier.setApplicationCode(Config.Agent.APPLICATION_CODE);
-        carrier.setPeerHost(Tags.PEER_HOST.get(activeSpan()));
+        String host = Tags.PEER_HOST.get(span);
+        if(host != null) {
+            Integer port = Tags.PEER_PORT.get(span);
+            carrier.setPeerHost(host + ":" + port);
+        }else{
+            carrier.setPeerHost(Tags.PEERS.get(span));
+        }
         carrier.setDistributedTraceIds(this.segment.getRelatedGlobalTraces());
         carrier.setSampled(this.segment.isSampled());
     }

skywalking-sniffer/skywalking-api/src/test/java/com/a/eye/skywalking/api/context/TracerContextTestCase.java

@@ -61,7 +61,8 @@ public class TracerContextTestCase {
         TracerContext context = new TracerContext();
         Span serviceSpan = context.createSpan("/serviceA");
         Span dbSpan = context.createSpan("db/preparedStatement/execute");
-        Tags.PEER_HOST.set(dbSpan, "127.0.0.1:8080");
+        Tags.PEER_HOST.set(dbSpan, "127.0.0.1");
+        Tags.PEER_PORT.set(dbSpan, 8080);
 
         ContextCarrier carrier = new ContextCarrier();
         context.inject(carrier);