上一篇文章使用了nodeos命令来启动eos服务，这一篇文章，就来介绍一下eos提供的相关程序和工具。

• nodeos
  EOSIO的核心守护进程，它可通过插件配置来启动一个节点。

• cleos
  这是一个命令行工具，它跟nodeos开放的REST API接口进行交互。在cleos使用时需要带上 nodeos实例的IP和端口。此外，cleos提供全面的命令行提示，如果不清楚说那个什么参数，可直接输 cleos 回车后会打印出 参数说明。如果需要查看子命令后的参数，也是如此，比如 输入 cleos create

  
  ERROR: RequiredError: Subcommand required
  Create various items, on and off the blockchain
  Usage: ./cleos create SUBCOMMAND

Subcommands:
key Create a new keypair and print the public and private keys
account Create a new account on the blockchain

* **keosd**   
EOSIO钱包守护进程，它云加载钱包相关插件，比如http接口和RPC API

* **launcher**   
launcher应用程序简化了在LAN和WAN网络上多个nodeos节点的分布

* **eosiocpp**    
 eosiocpp通过检查合约源代码中定义内容的类型，来生成ABI规范文件    
 为了指示一个类型需要导出到ABI文件，在类型声明上必须加上@abi这个注解， 比如

@abi action [name name2 ... nameN]
@abi table [index_type name]

  要生成abi文件，esoiocpp必须加-g

eosiocpp -g abi.json types.hpp

Generated abi.json ...

  eosiocpp也可以生成 `helper function` 来序列化/反序列化 ABI 文件里声明的类型

  例如   
  #### 声明一个`action`

#include <eosiolib/eosio.hpp>

class example : public eosio::contract {
   //@abi action
   void exampleaction( uint64_t param1, uint64_t param2, std::string param3 ) {
   }
};

{
  "types": [],
  "structs": [{
      "name": "exampleaction",
      "base": "",
      "fields": [{
           "name": "param1",
           "type": "uint64"
        },{
           "name": "param2",
           "type": "uint64"
        },{        
           "name": "param3",
           "type": "string"
        }
      ]
    }
  ],
  "actions": [{
      "name": "exampleaction",
      "type": "exampleaction",
      "ricardian_contract": ""
    }
  ],
  "tables": [],
  "ricardian_clauses": [],
  "abi_extensions": []
}

  #### 声明一张 `table`

#include <eosiolib/eosio.hpp>

//@abi table my_table
struct my_record {
  uint64_t    ssn;
  std::string fullname;
  uint64_t primary_key() const { return key; }
};
{
  "types": [],
  "structs": [{
      "name": "my_record",
      "base": "",
      "fields": [{
        "name": "ssn",
        "type": "uint64"
      },{
        "name": "fullname",
        "type": "string"
      }
      ]
    }
  ],
  "actions": [],
  "tables": [{
      "name": "my_table",
      "index_type": "i64",
      "key_names": [
        "ssn"
      ],
      "key_types": [
        "uint64"
      ],
      "type": "my_record"
    }
  ],
  "ricardian_clauses": [],
  "abi_extensions": []
}

  #### typedef exporting

  #include <eosiolib/eosio.hpp>
struct simple {
  uint64_t u64;
};

typedef simple simple_alias;
typedef eosio::name name_alias;

class examplecontract : eosio::contract {
//@abi action
   void actionone( uint32_t param1, name_alias param2, simple_alias param3 ) {}
};
{
  "types": [{
      "new_type_name": "simple_alias",
      "type": "simple"
    },{
      "new_type_name": "name_alias",
      "type": "name"
    }
  ],
  "structs": [{
      "name": "simple",
      "base": "",
      "fields": [{
        "type": "uint64",
        "name": "u64"
      }]
    },{
      "name": "actionone",
      "base": "",
      "fields": [{
        "type": "uint32",
        "name": "param1"
      },{
        "type": "name_alias",
        "name": "param2"
      },{
        "type": "simple_alias",
        "name": "param3"
      }
     ]
    }
  ],
  "actions": [{
      "name": "actionone",
      "type": "actionone",
      "ricardian_contract": ""
    }
  ],
  "tables": [],
  "ricardian_clauses": [],
  "abi_extensions": []
}

  #### 使用生成的序列化/反序列化函数并明确用户自定义的apply

#include <eosiolib/eosio.hpp>

struct simple {
  uint32_t u32;
};

struct my_complex_type {
  uint64_t u64;
  std::string str;
  simple simple;
  eosio::bytes bytes;
  public_key pub;
};

typedef my_complex_type complex;

//@abi action
struct test_action {
  uint32_t u32;
  complex cplx;
};

extern "C" {
   void apply( uint64_t code, uint64_t action, uint64_t receiver ) {
      if( code == N(mycontract) ) {
         if( action == N(testaction) ) {
            eosio::print("test_action content\n");
            test_action testact = eosio::unpack_action_data<test_action>();
            eosio::print_f( "Test action : % %", testact.u32, testact.cplx.u64 );
        }
     }
   }
}

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