Add Inline Actions

【Add Inline Actions】

1、为了使用 inline action，需要给 eosio.code 账号添加active权限。

　　To use the 'activeauthority inline you will need your contract's to give active authority to eosio.code` pseudo-authority

　　In order for the inline actions to be sent from addressbook, add the eosio.code permission to the contract's account's active permission.

cleos set account permission addressbook active '{"threshold": 1,"keys": [{"key": "EOS5NKJziczzVQefMxp3n1cp1X3FUegS7jw8LtxLvubZehqBKGiWT","weight": 1}], "accounts": [{"permission":{"actor":"addressbook","permission":"eosio.code"},"weight":1}]}' -p addressbook@owner

　　The eosio.code authority is a pseudo authority implemented to enhance security, and enable contracts to execute inline actions.

2、Notify方法

  [[eosio::action]]
  void notify(name user, std::string msg) {
    require_auth(get_self());
    require_recipient(user);
  }

　　get_self：Get this contract name. 对于本例，就是addressbook。

　　require_recipient：对 name 账号调用本方法。

3、send_summary()方法

  private: 
    void send_summary(name user, std::string message){
      action(
        //permission_level,
        //code,
        //action,
        //data
      );   
    }

The action constructor requires a number of parameters.

A permission_level struct
The contract to call (initialised using eosio::name type)
The action (initialised using eosio::name type)
The data to pass to the action, a tuple of positionals that correlate to the actions being called.

4、实现 send_summary

  private: 
    void send_summary(name user, std::string message){
      action(
        permission_level{get_self(),"active"_n},
        get_self(),
        "notify"_n,
        std::make_tuple(user, name{user}.to_string() + message)
      ).send();
    }

　　make_tuple：a function available through std C++ library. Data passed in the tuple is positional, and determined by the order of the parameters accepted by the action that being called.

5、合约发布后，我们测试一下。

　　1）尝试插入数据

cleos push action addressbook upsert '["alice", "alice", "liddell", 21, "123 drink me way", "wonderland", "amsterdam"]' -p alice@active

　　我们发现会触发3个action。下图，第二个#表明 addressbook 触发了 notify，第三个#表明 alice 触发了 notify。

executed transaction: e9e30524186bb6501cf490ceb744fe50654eb393ce0dd733f3bb6c68ff4b5622  160 bytes  9810 us
#   addressbook <= addressbook::upsert          {"user":"alice","first_name":"alice","last_name":"liddell","age":21,"street":"123 drink me way","cit...
#   addressbook <= addressbook::notify          {"user":"alice","msg":"alicesuccessfully emplaced record to addressbook"}
#         alice <= addressbook::notify          {"user":"alice","msg":"alicesuccessfully emplaced record to addressbook"}

　　2）查看alice动作

cleos get actions alice

　　结果如下，有两个动作

参考：https://developers.eos.io/eosio-home/docs/inline-actions

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