kickoutUser method
关闭uid
对应的session
Implementation
void kickoutUser(String uid) {
final session = _websoketSessionMap[uid];
if (session == null) return;
logDebug(['kickoutUser =>', session.info]);
unbindUser(session); //解绑uid对应的旧session(此步骤务必在close之前执行,否则close异步事件中,会将uid对应的新session移除掉)
session.close(EasyConstant.serverCloseByKickoutError.code, EasyConstant.serverCloseByKickoutError.desc); //关闭旧的session
}