优化途牛接口数据

application/third_party/tuniu/controllers/tuniu_train.php

@@ -72,9 +72,15 @@ class Tuniu_train extends CI_Controller{
 				if(empty(json_decode($back_data)->data)){
 					$error = json_decode($back_data);
 					$trainCache = $this->tuniuprice_model->get_train_cache($fromStation,$toStation);
-					$back_data = $trainCache->tpc_content;
+					if(!empty($trainCache)){
-					$isCache = true;
+						$back_data = $trainCache->tpc_content;
-					log_message('error','tuniutrain 查询出错'.json_decode($back_data));
+						$isCache = true;
+						log_message('error','tuniutrain 查询出错|'.$error->errorMsg);
+					}else{
+						$back_data = null;
+						log_message('error','tuniutrain 缓存为空|'.$fromStation.'|'.$toStation.'|'.$date);
+					}
+					
 				}else{
 					$this->tuniuprice_model->addOrUpdate($fromStation,$toStation,$back_data);
 				}
@@ -82,8 +88,12 @@ class Tuniu_train extends CI_Controller{
 
 			//途牛数据格式转换
 			$return_data = new stdClass();
-			$return_data->returnCode = json_decode($back_data)->returnCode;
+			if(empty($back_data)){
-			//echo $return_data->returnCode;
+				$return_data->returnCode = '404';
+			}else{
+				$return_data->returnCode = json_decode($back_data)->returnCode;
+			}
+			
 			$return_data->httpstatus = 200;
 			$return_data->data = new stdClass(); 
 			$return_data->data->seven = $iseven;