eos智能合约开发-07 第一个智能合约

准备�
上小节我们创建了user用户， 那么本小节我们来使用user用户部署我们直接的智能合约

eosiocpp构建合约文件系统
Eosiocpp 是智能合约的引导工具， 简单说需要生成智能合约就需要使用它
wast文件生成方式：
eosiocpp -o {contract}.cpp
abi是一个json格式的，用来描述智能合约如何在action和二进制程序中进行转变的方法，也用来描述数据库状态。有了abi来描述你的智能合约，开发者和用户都可以通过JSON无缝地与合约进行交互。
abi文件生成时源文件语法包括：
typedef，可以自定义类型，供合约使用。在源文件中可通过typedef关键字导出类型。
///@abi table，注解，标在一个类或者结构上，会通过eosiocpp工具生成abi文件中包含数据库表table的名字。
///@abi action，注解，标在一个函数或方法上，这是合约暴露给外部的功能接口，外部可以调用这些动作。（可以给同一个功能函数定义多个action名字，例如//@abi action action1 action2大家都调用一个。）

abi文件生成方式：
eosiocpp -g ${contract}.abi ${contract}.hpp

abi文件生成以后，我们可以找一个打开看一下，里面包含的内容很多，有各种属性，数据，方法功能的描述。

Helloworld
    1: hello.cpp
    #include 
    #include 
    //用eosio命名空间
    using namespace eosio;
    
    //所有的智能合约都继承自contract类
    class Hello : public eosio::contract {
      public:
          using contract::contract;
    
          /// @abi action
          void hi( account_name user ) {
             print( "Hello World , ", name{user} );
          }
    
    };
    EOSIO_ABI( Hello, (hi) )

    
    2: 编译wast 文件
        eosiocpp -o hello.wast hello.cpp
        
        root@aries-virtual-machine:/home/aries/tmp/contracts/hello# pwd
        /home/aries/tmp/contracts/hello
        root@aries-virtual-machine:/home/aries/tmp/contracts/hello# ls
        hello.cpp
        root@aries-virtual-machine:/home/aries/tmp/contracts/hello# eosiocpp -o hello.wast hello.cpp 
        root@aries-virtual-machine:/home/aries/tmp/contracts/hello# ls
        hello.cpp  hello.wasm  hello.wast
        root@aries-virtual-machine:/home/aries/tmp/contracts/hello#
        
    3: 编译abi
         eosiocpp -g  hello.abi  hello.cpp
        2018-08-31T03:51:21.317 thread-0   abi_generator.hpp:68          ricardian_contracts  ] Warning, no ricardian clauses found for Hello
        2018-08-31T03:51:21.318 thread-0   abi_generator.hpp:75          ricardian_contracts  ] Warning, no ricardian contract found for hi
        Generated hello.abi ...
        �
        eosiocpp -o hello.abi hello.cpp 
        root@aries-virtual-machine:/home/aries/tmp/contracts/hello# ls
        hello.abi  hello.cpp  hello.wasm  hello.wast
        
        
部署智能合约
        
        root@aries-virtual-machine:/home/aries/tmp/contracts# cleos set contract user hello
        Reading WASM from hello/hello.wasm...
        Publishing contract...
        executed transaction: 8c066acae4dc535b666ac43e5d6f3fcae040818cda65325723e0ab7ca3d1e6ec  1792 bytes  4242 us
        #         eosio <= eosio::setcode               {"account":"user","vmtype":0,"vmversion":0,"code":"0061736d01000000013b0c60027f7e006000017e60027e7e0...
        #         eosio <= eosio::setabi                {"account":"user","abi":"0e656f73696f3a3a6162692f312e30000102686900010475736572046e616d6501000000000...
        warning: transaction executed locally, but may not be confirmed by the network yet    ] 
        
执行智能合约
    
        cleos push action user hi '{"user":"aries"}' -p user
        executed transaction: 88b7e9f0ef6a3f3ec6a0642c68049d124843ed1f1e160b9044b467d0b1391f3c  104 bytes  385 us
        #          user <= user::hi                     {"user":"aries"}
        >> Hello, aries
        warning: transaction executed locally, but may not be confirmed by the network yet    ]