EOS 智能合约源代码解读 （13）system合约“native类的关键方法”

Posted 2021-11-05 thefist11

1. native.hpp

  class [[eossys::contract("eossys.system")]] native : public eossys::contract {
      public:

         /**
          * New account action is called after a new account is created. This code enforces resource-limits rules
          * for new accounts as well as new account naming conventions.
          *
          * 1. accounts cannot contain '.' symbols which forces all acccounts to be 12
          * characters long without '.' until a future account auction process is implemented
          * which prevents name squatting.
          *
          * 2. new accounts must stake a minimal number of tokens (as set in system parameters)
          * therefore, this method will execute an inline buyram from receiver for newacnt in
          * an amount equal to the current new account creation fee.
          */
         [[eossys::action]]
         void newaccount( const text_name&       creator,
                          const text_name&       name,
                          ignore<authority> owner,
                          ignore<authority> active);

         [[eossys::action]]
         void eosupdate( ignore<text_name>      account,
                          ignore<name>      permission,
                          ignore<name>      parent,
                          ignore<authority> auth ) {}

        [[eossys::action]]
         void eosdelete( ignore<text_name> account,
                          ignore<name> permission ) {}

1.1 system newaccount

该action在创建新帐户后调用，此代码强制实施新帐户的资源限制规则以及新帐户命名约定。规则包含两个：

• 帐户不能包含’.’ 强制所有帐户的符号长度为12个字符而没有“.” 直到实施未来的帐户拍卖流程。
• 新帐户必须包含最少数量的token（如系统参数中所设置），因此，此方法将为新用户执行内联buyram购买内存，其金额等于当前新帐户的创建费用。

1.2 其他[[eosio::action]]

动作	返回值	参数	解释
updateauth	void	ignore account ignore permission ignore parent ignore auth	更新账户的某项权限内容
deleteauth	void	ignore account ignore permission	删除账户的某项权限内容
linkauth	void	ignore account ignore code ignore type ignore requirement	连接其他账户
unlinkauth	void	ignore account ignore code ignore type	解除某账户的连接
canceldelay	void	ignore<permission_level> canceling_auth ignore<capi_checksum256> trx_id	取消某个延迟交易
onerror	void	ignore<uint128_t> sender_id ignorestd::vector sent_trx	处理错误
setabi	void	name account const std::vector& abi	设置账户的abi内容
setcode	void	name account uint8_t vmtype uint8_t vmversion const std::vector& code	设置账户的code内容