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EOS学习笔记

[TOC]

参考文档: https://www.twle.cn/c/yufei/eosio/eosio-basic-contract.html

1.EOS开发环境搭建

安装EOS

wget https://github.com/eosio/eos/releases/download/v1.5.2/eosio_1.5.2-1-ubuntu-18.04_amd64.deb
sudo apt install ./eosio_1.5.2-1-ubuntu-18.04_amd64.deb

安装编译工具cdt

注意: 如果是用虚拟机的, 至少需要CPU核数为2(大于1即可), 否则使用eosio-cpp进行编译, 会一直卡死, 智能Ctrl+C中断, 而且不会生成ABI文件.

EOS工具功能介绍

  • nodeos : EOS节点工具, EOS核心程序

  • cleos : 客户端

  • keosd: 钱包密钥管理工具

  • eosio-cpp: 智能合约编译工具, 将C++编译为WASM并生成ABI

启动节点

nodeos -e -p eosio --plugin eosio::chain_api_plugin --plugin eosio::history_api_plugin --contracts-console

如果出现错误: throw database dirty flag set , 加上--delete-all-blocks即可解决

创建钱包

cleos wallet create -n yqq -f eospass.txt

记录钱包密码(解锁和交易都需要用到):

PW5HpgpPxyhshPoiqzecwkUN829zBKw7m4wgqEmAdGKG2YBy3PxU4

打开钱包

cleos wallet open

列出钱包

cleos wallet list

解锁钱包

cleos wallet unlock

导入密钥

cleos create key --to-console   //创建密钥对
cleos wallet import   //导入创建出来的密钥

注意: 记得导入以下超级账号, 用于测试

eosio public key: EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV eosio private key: 5KQwrPbwdL6PhXujxW37FSSQZ1JiwsST4cqQzDeyXtP79zkvFD3

创建测试账户

  • 列出当前钱包密钥对 cleos wallet private_keys

     [[
    "EOS6SYwkp6CwHR7NWz9uckkHe9TKX3HZHaBKiXFZogHcXQE8JXywG",
    "5K8KtTwMarCCZnNY6XTp8WBvSSSJx1jMqLzLweYcDkDs56UDmdg"
  ],[
    "EOS724f6jzEEn9cosQ8dxjaJQRXF5vSiFzkywmRTyMSVWxqaiXgVL",
    "5KMq5XogpYSGED2dBES9nnG5qa1xMqDPN5cqdfwfkeAHgTmzmkB"
  ],[
    "EOS7uXeLVLEzpjAuLaqJ5NU72tvBEcjA7kopFMpAzvNtuDHLdG9g2",
    "5J7iz8Umnx8Y4URqduKqeou7GHM6G2MrS85buTDEEU8WnE9CqZr"
  ],[
    "EOS8dcNUtS6TSuKzEmG4KeihkPKnzo7AjEWmqaLBwGYY8PLZbdsNW",
    "5K1EwcNAHQ2tbRcXGHHn9nJDxxnNPAhaYT1f8SKS9fNPccfBFgV"
  ]
]

  • 创建eosio.token账户, 指定创建者是eosio(管理员账户)

    cleos create account eosio eosio.token EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV

  • 创建hello账户

    cleos create account eosio hello EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV

  • 创建hi账户

    cleos create account eosio hi EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV

2.EOS智能合约开发

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

2.1.Hello World

编写合约

hello.cpp

#include <eosiolib/eosio.hpp>
#include <eosiolib/print.hpp>

using namespace eosio;

class hello : public contract {
  public:
      using contract::contract;

      [[eosio::action]]
      void hi() {
         print("Hello World");
      }
};
EOSIO_DISPATCH( hello, (hi))

编译合约

eosio-cpp -o hello.wasm hello.cpp --abigen

部署合约

cleos set contract hello ../hello -p

运行合约

cleos push action hello hi '[]' -p hello@active

如果没有看到 ">> Hello world" , 需要重新启动nodeos, 在启动选项中加入--contracts-console, 注意: 启动之后需要重新创建测试用户!!!

如果nodeos 重启了, 必须重新创建测试账号!! 否则也会报错:

yqq@ubuntu18-04:~/mine/eos/1230/hello$ cleos set contract hello ../hello -p Failed to get existing code hash, continue without duplicate check... Reading WASM from /home/yqq/mine/eos/1230/hello/hello.wasm... Publishing contract... Error 3090003: Provided keys, permissions, and delays do not satisfy declared authorizations Ensure that you have the related private keys inside your wallet and your wallet is unlocked.

运行效果演示

2.2.发行代币

下载测试代码

git clone https://github.com/EOSIO/eosio.contracts --branch v1.4.0 --single-branch
cd eosio.contracts/eosio.token

创建测试账户

cleos create account eosio eosio.token EOS6MRyAjQq8ud7hVNYcfnVPJqcVpscN5So8BhtHuGYqET5GDW5CV

编译智能合约

eosio-cpp -I include -o eosio.token.wasm src/eosio.token.cpp --abigen

部署代币智能合约

cleos set contract eosio.token CONTRACTS_DIR/eosio.contracts/eosio.token --abi eosio.token.abi -p eosio.token@active


结果:
Reading WASM from ...
Publishing contract...
executed transaction: 69c68b1bd5d61a0cc146b11e89e11f02527f24e4b240731c4003ad1dc0c87c2c  9696 bytes  6290 us
#         eosio <= eosio::setcode               {"account":"eosio.token","vmtype":0,"vmversion":0,"code":"0061736d0100000001aa011c60037f7e7f0060047f...
#         eosio <= eosio::setabi                {"account":"eosio.token","abi":"0e656f73696f3a3a6162692f312e30000605636c6f73650002056f776e6572046e61...
warning: transaction executed locally, but may not be confirmed by the network yet         ]

创建代币

调用create接口创建代币, create函数, 第2个参数有两部分组成: 最大发行数量 + 代币名

void token::create( name   issuer ,  //发行者
                    asset  maximum_supply )   //最大发行数量+代币名
cleos push action eosio.token create '[ "eosio", "1000000000.0000 SYS"]' -p eosio.token@active

//-p  指定权限和创建者

这样就创建了一个名为 SYS代币.

发行代币

调用合约eosio.token中的issue方法, 发行代币

cleos push action eosio.token issue '[ "alice", "100.0000 SYS", "memo" ]' -p eosio@active       
//如果没有账户alice, 会报Eorror 3050003错误
//创建一个alice即可,注意指定eosio为创建者

运行结果:

yqq@ubuntu18-04:~/mine/eos/eosio.contracts/eosio.token$ cleos push action eosio.token issue '[ "alice", "100.0000 SYS", "memo" ]' -p eosio@active
executed transaction: 6384bc6e9f1c8e61f045a1475dcdd5abc8bd5fe749e0b295953f961df4242943  128 bytes  509 us
#   eosio.token <= eosio.token::issue           {"to":"alice","quantity":"100.0000 SYS","memo":"memo"}
#   eosio.token <= eosio.token::transfer        {"from":"eosio","to":"alice","quantity":"100.0000 SYS","memo":"memo"}
#         eosio <= eosio.token::transfer        {"from":"eosio","to":"alice","quantity":"100.0000 SYS","memo":"memo"}
#         alice <= eosio.token::transfer        {"from":"eosio","to":"alice","quantity":"100.0000 SYS","memo":"memo"}
warning: transaction executed l
ocally, but may not be confirmed by the network yet         ]

可以看到有几个不同动作: 1个issue和3个transfer, 虽然我们提交的操作只有issue, 但是这一个issue其实是以一个"inline transfer"来执行的, 并且会通知发送者和接收者.有时候eosio.token会跳过"inline transfer" 而直接修改账户余额.

转账

调用transfer方法进行转账

cleos push action eosio.token transfer '[ "alice", "bob", "25.0000 SYS", "m" ]' -p alice@active   
//如果没有bob账户, 先创建bob账户


//查看转账后, bob的余额
cleos get currency balance eosio.token bob SYS
//输出: 25.00 SYS

//查看alice的余额
cleos get currency balance eosio.token alice SYS
//输出: 75.00 SYS

代码分析

EOS使用多索引表存储合约数据

2.3.理解ABI文件

Application Binary Interface (ABI) 是一个用于描述智能合约的Json文件.ABI文件描述了数据库的状态转换.你可以使用ABI描述你的智能合约, 其他开发人员和用户也可以使用Json语你的智能合约交互.

执行交易时会绕过ABI文件, 消息和动作的传递不必按照ABI进行, ABI这是一个指导性的文件.

一个ABI文件结构

{
   "version": "eosio::abi/1.0",
   "types": [],
   "structs": [],
   "actions": [],
   "tables": [],
   "ricardian_clauses": [],
   "abi_extensions": [],
   "___comment" : ""
}

types

用于描述作为public函数参数的自定义类型. 或者用于作为需要在ABI文件说明的结构体成员的自定义类型.

structs

用于描述public函数或者结构体; name是参数名或者结构体字段名 ;Fields用于描述函数参数 或者 结构体成员.

actions

描述public函数

tables

表结构体, 类似传统关系型数据库的表.

{
  "name": "",       //The name of the table, determined during instantiation. 
  "type": "", 			//The table's corresponding struct, 关联的结构体
  "index_type": "", //The type of primary index of this table
  "key_names" : [], //An array of key names, length must equal length of key_types member
  "key_types" : []  //An array of key types that correspond to key names array member, length of array must equal length of key names array.
}

2.4.数据持久化

对table的增删改查

编写合约

#include <eosiolib/eosio.hpp>

using namespace eosio;

class [[eosio::contract]] addressbook : public eosio::contract {  //使用辅助属性，让ABI生成器提取参数信息和结构体信息

	public:
		using contract::contract;
		addressbook(name receiver, name code, datastream<const char*> ds):contract(receiver, code, ds){}


		[[eosio::action]]   //使用辅助属性，让ABI生成器提取参数信息和结构体信息
		void upsert(name user, std::string first_name, std::string last_name, std::string street, std::string city, std::string state)
		{
			require_auth(user);

			address_index addresses(_code, _code.value);

			auto iterator = addresses.find(user.value);

			if(iterator == addresses.end())
			{
				//如果用户不存在， 则创建用户
				addresses.emplace(user, [&](auto &row){
						row.key = user;
						row.first_name = first_name;
						row.last_name = last_name;
						row.street = street;
						row.city = city;
						row.state = state;
						});
			}
			else
			{
				//如果用户已经存在则修改信息
				//std::string changes;
				addresses.modify(iterator, user, [&]( auto& row ) {
						row.key = user;
						row.first_name = first_name;
						row.last_name = last_name;
						row.street = street;
						row.city = city;
						row.state = state;
						});
			}
		}


		[[eosio::action]]   //使用辅助属性，让ABI生成器提取参数信息和结构体信息
		void erase(name user)//删除用户
		{
			require_auth(user);
			address_index addresses(_self, _code.value);
			auto iterator = addresses.find(user.value);
			eosio_assert(iterator != addresses.end(), "要删除的数据不存在");
			addresses.erase(iterator);
		}

	private: 
  
		//struct person;
		struct [[eosio::table]] person{ //使用辅助属性，让ABI生成器提取参数信息和结构体信息
			name key;
			std::string first_name;
			std::string last_name;
			std::string street;
			std::string city;
			std::string state;

			uint64_t primary_key() const{return key.value;}
		};

		typedef eosio::multi_index<"people"_n, person> address_index;

};


//这个宏定义是给wasm编译器用的，用来将一个调用与合约中的具体函数关联映射起来
EOSIO_DISPATCH(addressbook, (upsert)(erase))

编译部署

eosio-cpp -o addressbook.wasm addressbook.cpp --abigen
cleos create account eosio addressbook YOUR_PUBLIC_KEY YOUR_PUBLIC_KEY -p eosio@active    //创建测试账户,  YOUR_PUBLIC_KEY是 eosio的公钥

cleos set contract addressbook CONTRACTS_DIR/addressbook -p addressbook@active

增加


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

//查看
cleos get table addressbook addressbook people --lower alice --limit 1


//测试用户alice不能为其他用户添加数据的情况, 验证require_auth(user);是否生效
cleos push action addressbook upsert '["bob", "bob", "is a loser", "doesnt exist", "somewhere", "someplace"]' -p alice@active

删除

cleos push action addressbook erase '["alice"]' -p alice@active

//查看删除之后
cleos get table addressbook addressbook people --lower alice --limit 1

运行效果

2.5.二级索引

参考: https://developers.eos.io/eosio-home/docs/secondary-indices

3.总结

参考: https://www.jianshu.com/p/9dddca4009a9