🚑 add zone for bili discovery in fetching server nodes

src/brpc/policy/discovery_naming_service.cpp

@@ -41,6 +41,7 @@ DEFINE_string(discovery_api_addr, DEFAULT_DISCOVERY_API_ADDR, "The address of di
 DEFINE_int32(discovery_timeout_ms, 3000, "Timeout for discovery requests");
 DEFINE_string(discovery_env, "prod", "Environment of services");
 DEFINE_string(discovery_status, "1", "Status of services. 1 for ready, 2 for not ready, 3 for all");
+DEFINE_string(discovery_zone, "", "Zone of  services");
 DEFINE_int32(discovery_renew_interval_s, 30, "The interval between two consecutive renews");
 DEFINE_int32(discovery_reregister_threshold, 3, "The renew error threshold beyond"
         " which Register would be called again");
@@ -349,8 +350,9 @@ int DiscoveryNamingService::GetServers(const char* service_name,
     servers->clear();
     Controller cntl;
     cntl.http_request().uri() = butil::string_printf(
-            "/discovery/fetchs?appid=%s&env=%s&status=%s", service_name,
-            FLAGS_discovery_env.c_str(), FLAGS_discovery_status.c_str());
+            "/discovery/fetchs?appid=%s&env=%s&status=%s&zone=%s", service_name,
+            FLAGS_discovery_env.c_str(), FLAGS_discovery_status.c_str(),
+            FLAGS_discovery_zone.c_str());
     chan->CallMethod(NULL, &cntl, NULL, NULL, NULL);
     if (cntl.Failed()) {
         LOG(ERROR) << "Fail to get /discovery/fetchs: " << cntl.ErrorText();