fix register local. (#8)

* fix register local.

* fix e2e.

.gitignore

+/build/
+target/
+.idea/
+*.iml
+.classpath
+.project
+.settings/
+.DS_Store
+*~
+packages/
+**/dependency-reduced-pom.xml
+/skywalking-agent/
+/dist/
+/docker/snapshot/*.gz
+.mvn/wrapper/*.jar
+.factorypath  
+.vscode 
+.checkstyle
+.externalToolBuilders
+/test/plugin/dist
+/test/plugin/workspace

lib/skywalking/client.lua

@@ -33,22 +33,22 @@ function Client:startBackendTimer(backend_http_uri)
     check = function(premature)
         if not premature then
             local serviceId = metadata_buffer:get('serviceId')
-            if serviceId == nil then
+            if (serviceId == nil or serviceId == 0) then
                 self:registerService(metadata_buffer, backend_http_uri)
             end
 
             -- Register is in the async way, if register successfully, go for instance register
             serviceId = metadata_buffer:get('serviceId')
-            if serviceId ~= nil then
+            if (serviceId ~= nil and serviceId ~= 0) then
                 local serviceInstId = metadata_buffer:get('serviceInstId')
-                if serviceInstId == nil then
+                if (serviceInstId == nil or serviceInstId == 0)  then
                     self:registerServiceInstance(metadata_buffer, backend_http_uri)
                 end
             end
 
             -- After all register successfully, begin to send trace segments
             local serviceInstId = metadata_buffer:get('serviceInstId')
-            if serviceInstId ~= nil then
+            if (serviceInstId ~= nil and serviceInstId ~= 0) then
                 self:reportTraces(metadata_buffer, backend_http_uri)
                 self:ping(metadata_buffer, backend_http_uri)
             end

lib/skywalking/tracer.lua

@@ -26,7 +26,7 @@ function Tracer:startBackendTimer()
     local serviceName = metadata_buffer:get("serviceName")
     local serviceInstId = metadata_buffer:get("serviceInstId")
     local serviceId = metadata_buffer:get('serviceId')
-    if serviceInstId ~= nil then
+    if (serviceInstId ~= nil and serviceInstId ~= 0) then
         tracingContext = TC:new(serviceId, serviceInstId)
     else
         tracingContext = TC:newNoOP()