add connect interface and log4 with code

LFtid1056/cloudfront/code/log4.cpp

@@ -129,6 +129,10 @@ bool DebugSwitch::match(const std::string& logger_name, int level, int logtype)
 std::map<std::string, TypedLogger> logger_map;
 DebugSwitch g_debug_switch;
 
+// ★新增：定义 TLS 变量，默认 0
+
+thread_local int g_log_code_tls = 0;
+
 class SendAppender : public Appender {
 protected:
     void append(const spi::InternalLoggingEvent& event) {
@@ -145,6 +149,9 @@ protected:
         else
             level_str = "terminal";
 
+        // ★读取 TLS 中的 code（在打日志的线程里由宏设定）
+        int code = g_log_code_tls;  // 若未显式传入，则为 0
+
         if (level == ERROR_LOG_LEVEL || level == WARN_LOG_LEVEL || g_debug_switch.match(logger_name, level, logtype)) {
             std::ostringstream oss;
             oss << "{\"processNo\":\"" << std::to_string(g_front_seg_index)
@@ -154,6 +161,8 @@ protected:
                 << "\",\"grade\":\"" << get_level_str(level)
                 << "\",\"logtype\":\"" << (logtype == LOGTYPE_COM ? "com" : "data")
                 << "\",\"frontType\":\"" << "cloudfront"
+                // ★新增：输出 code 字段（整型）
+                << "\",\"code\":\"" << code
                 << "\",\"log\":\"" << escape_json(msg) << "\"}";
 
             std::string jsonString = oss.str();