eos 智能合约开发体验

• eos编译安装
• eos 特性
  • 数据存储
• eos投票智能合约开发
• eos投票智能合约部署测试
• 注意避坑

eos编译安装

ERROR: Could not find a package configuration file provided by "LLVM" (requested version 4.0) with any of the following names
需要执行以下命令（检查一下你有没有这个目录，没有的话搜索一下）
export LLVM_DIR=/usr/local/Cellar/llvm@4/4.0.1/lib/cmake

cleos/localize.hpp:7:10: fatal error: 'libintl.h' file not found

brew reinstall gettext
brew unlink gettext && brew link gettext --force

eos/build/programs/nodeos/config.hpp:13:33: error: invalid suffix 'x' on integer constant

重新下载tag dawn4版本进行编译通过

EOS.IO has been successfully built. 0:0:10

    To verify your installation run the following commands:

    /usr/local/bin/mongod -f /usr/local/etc/mongod.conf &
    cd /opt/eos/build; make test

    For more information:
    EOS.IO website: https://eos.io
    EOS.IO Telegram channel @ https://t.me/EOSProject
    EOS.IO resources: https://eos.io/resources/
    EOS.IO wiki: https://github.com/EOSIO/eos/wiki

cd build
sudo make install

eos 特性

数据存储

eos数据库使用指南 参照 Boost Multi-Index Containers容器进行理解
【系列】EOS智能合约开发31 - 使用数据库的智能合约实例
【系列】EOS智能合约开发32 - 详解Multi-Index（上）
【系列】EOS智能合约开发33 - 详解Multi-Index（下）
【系列】EOS智能合约开发34 - EOS开发命令阶段性总结
系列文章

eos投票智能合约开发

创建合约eosiocpp -n ballot

// ballot.hpp

/**
 *  @file
 *  @copyright defined in eos/LICENSE.txt
 */
#include <eosiolib/eosio.hpp>
#include <string>

using namespace eosio;
using std::string;

class Ballot : public eosio::contract
{
public:
  using contract::contract;
  Ballot(account_name self) : contract(self) {}

  // 投票发起人接口
  void addposposal(string posposal_name);                      // 初始化投票提案
  void addvoter(account_name voter_name, uint64_t weight = 1); // 初始化投票人
  // 普通选民接口
  void delegate(account_name voter, account_name delegate_to); // 委托投票（跟随投票）
  void vote(account_name voter, string proposal);              // 投票给某个提议
  void winproposal();                                          // 返回投票数最多的提议
  void allproposal();                                          // 返回全部提案投票状态

private:
  // 定义投票人
  struct voter
  {
    account_name account;      // 投票人
    uint64_t weight;           // 权重
    bool voted;                // 如果值为true，代表这个投票人已经投过票
    uint64_t delegate_account; // 委托投票人地址
    string pos_name;           // 投票提案名

    uint64_t primary_key() const { return account; }

    EOSLIB_SERIALIZE(voter, (account)(weight)(voted)(delegate_account)(pos_name));
  };
  // 提案的数据结构
  struct posposal
  {
    string name;        // 提案的名称
    uint64_t voteCount; // 提议接受的投票数

    uint64_t primary_key() const { return eosio::string_to_name(name.c_str()); }

    EOSLIB_SERIALIZE(posposal, (name)(voteCount));
  };

  typedef eosio::multi_index<N(voter), voter> voter_index;
  typedef eosio::multi_index<N(posposal), posposal> posposal_index;
};

// ballot.cpp

#include <eosiolib/eosio.hpp>
#include "ballot.hpp"

using namespace eosio;

// 投票发起人接口
void Ballot::addposposal(string posposal_name) // 初始化投票提案
{
  require_auth(_self);

  posposal_index posposals(_self, _self);
  auto it = posposals.find(eosio::string_to_name(posposal_name.c_str()));
  eosio_assert(it == posposals.end(), "posposal exist");

  posposals.emplace(_self, [&](auto &a) {
    a.name = posposal_name;
    a.voteCount = 0;
  });
}
void Ballot::addvoter(account_name voter_name, uint64_t weight /* =1 */) // 初始化投票人
{
  require_auth(_self);
  eosio_assert(weight > 0, "must positive weight");

  voter_index voters(_self, _self);
  auto it = voters.find(voter_name);

  eosio_assert(it == voters.end(), "voter exist");
  voters.emplace(_self, [&](auto &a) {
    a.account = voter_name;
    a.weight = weight;
    a.voted = false;
    a.delegate_account = 0;
    a.pos_name = "";
  });
}
// 普通选民接口
void Ballot::delegate(account_name voter, account_name delegate_to) // 委托投票（跟随投票）
{
  require_auth(voter);

  voter_index voters(_self, _self);
  auto vit = voters.find(voter);
  eosio_assert(vit->voted == false, "is voted");
  eosio_assert(vit != voters.end(), "voter not exist");
  auto it = voters.find(delegate_to);
  eosio_assert(it != voters.end(), "delegate_to not exist");

  while (it != voters.end() && it->delegate_account != 0 && it->delegate_account != voter)
    it = voters.find(it->delegate_account);

  eosio_assert(it != voters.end(), "delegate obj not exist");
  eosio_assert(it->account != voter, "not delegate self");

  if (it->voted)
  {
    vote(voter, it->pos_name);
  }
  else
  {
    voters.modify(it, _self, [&](auto &a) {
      a.weight += vit->weight;
    });
    voters.modify(vit, _self, [&](auto &a) {
      a.voted = true;
    });
  }
}
void Ballot::vote(account_name voter, string proposal) // 投票给某个提议
{
  require_auth(voter);
  posposal_index posposals(_self, _self);
  auto it = posposals.find(eosio::string_to_name(proposal.c_str()));
  eosio_assert(it != posposals.end(), "posposal not exist");

  voter_index voters(_self, _self);
  auto vit = voters.find(voter);
  eosio_assert(vit->voted == false, "is voted");
  eosio_assert(vit != voters.end(), "voter not exist");

  voters.modify(vit, _self, [&](auto &a) {
    a.voted = true;
    a.pos_name = proposal;
  });

  posposals.modify(it, _self, [&](auto &a) {
    a.voteCount += vit->weight;
  });
}
void Ballot::winproposal() // 返回投票数最多的提议
{
  posposal_index posposals(_self, _self);
  auto win = posposal();
  uint64_t max = 0;
  for (auto it : posposals)
  {
    if (it.voteCount > max)
    {
      max = it.voteCount;
      win = it;
    }
  }
  if (max > 0)
  {
    eosio::print("win posposal is: ", win.name.c_str(), "vote count", win.voteCount, "\n");
  }
  else
  {
    eosio::print("not vote", "\n");
  }
}
void Ballot::allproposal() // 返回全部提案投票状态
{
  posposal_index posposals(_self, _self);
  uint64_t idx = 0;
  for (auto it : posposals)
  {
    eosio::print(" posposal ", idx, ":", it.name.c_str(), "vote count", it.voteCount, "\n");
  }
}

EOSIO_ABI(Ballot, (addposposal)(addvoter)(delegate)(vote)(winproposal)(allproposal))

eosiocpp -o ballot.wast ballot.cpp
eosiocpp -g ballot.abi ballot.cpp

eos投票智能合约部署测试

1.创建
2.生成公私钥

cleos create key
Private key: 5JMiZ1VyByUsHuRR9homayUFKM6buMLzyBeJ6p5ToMEn5N27p1B
Public key: EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak

3.创建钱包

cleos wallet create -n gxk
Creating wallet: gxk
Save password to use in the future to unlock this wallet.
Without password imported keys will not be retrievable.
"PW5HsWtVxz3kBQKeTGvNL448p2cD1P9ghQAM6MYjWysfsLZApx3n2"

4.创建多个账户

cleos create account eosio acc1 EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak  EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak

cleos create account eosio acc2 EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak  EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak

cleos create account eosio acc3 EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak  EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak

cleos create account eosio acc4 EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak  EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak

cleos create account eosio acc5 EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak  EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak

cleos create account eosio accballot EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak  EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak

5.查看账户

# cleos get accounts EOS8PPs1yQ4bkBDMAzGGNigPWmKLNBV6FULFq8TmcNFP9Pv5Jgvak
{
  "account_names": [
    "acc1",
    "acc2",
    "acc3",
    "acc4",
    "acc5",
    "accballot"
  ]
}

6.部署智能合约

# cleos set contract accballot   /opt/eos/contracts/ballot
Reading WAST/WASM from /opt/eos/contracts/ballot/ballot.wast...
Using already assembled WASM...
Publishing contract...
executed transaction: c01fc59198803da7206a94751d6913500b1a06d2a36fb643bc136e0e94344898  7872 bytes  5781 us
#         eosio <= eosio::setcode               {"account":"accballot","vmtype":0,"vmversion":0,"code":"0061736d01000000017a1460027f7f0060037f7e7e00...
#         eosio <= eosio::setabi                {"account":"accballot","abi":{"types":[],"structs":[{"name":"addposposal","base":"","fields":[{"name...
warning: transaction executed locally, but may not be confirmed by the network yet

#cleos get code accballot
code hash: adaa3df4b876295a8eb185edf9668f110d83d8af03dce0ccdc6ae9503967fd00

7.调用合约，创建投票

#cleos push action accballot addposposal '["baidu"]' -p accballot
executed transaction: f0b54c41b0418d7785dd37f0db30099e50b6a6426ed10b3741ff22d7c143285a  104 bytes  11014 us   accballot <= accballot::addposposal       {"posposal_name":"baidu"}
warning: transaction executed locally, but may not be confirmed by the network yet

#cleos push action accballot addposposal '["alibaba"]' -p accballot
#cleos push action accballot addposposal '["163"]' -p accballot
#cleos push action accballot addposposal '["360"]' -p accballot
#cleos push action accballot addposposal '["qq"]' -p accballot
#cleos push action accballot addposposal '["yy"]' -p accballot

// 返回投票状态
#cleos push action accballot allproposal '[]' -p acc1
executed transaction: 672fc91ea96bd9509850162dd1866eb4a625afd844e488883129df648ea26202  96 bytes  1063 us
      accballot <= accballot::allproposal       {}
>>  posposal 0:163vote count0

// 查询投票结果：当前未进行过投票
#cleos push action accballot winproposal '[]' -p acc1
executed transaction: e37d6ea6577055bfe33a053c29cf369b7c2702550078af99627f1fea9fa92620  96 bytes  1086 us
      accballot <= accballot::winproposal       {}
>> not vote

添加投票人

#cleos push action accballot addvoter '["acc1",1]' -p accballot
#cleos push action accballot addvoter '["acc2",1]' -p accballot
#cleos push action accballot addvoter '["acc3",1]' -p accballot
#cleos push action accballot addvoter '["acc4",1]' -p accballot
#cleos push action accballot addvoter '["acc5",1]' -p accballot
executed transaction: 954165ee5be714b7ef31a3183cbda179b69d8c2ea159c4447ee2ed0c4283c2d8  112 bytes  468 us
      accballot <= accballot::addvoter          {"voter_name":"acc5","weight":1}
warning: transaction executed locally, but may not be confirmed by the network yet

8.进行投票操作

#cleos push action accballot vote '["acc1","qq"]' -p acc1
#cleos push action accballot vote '["acc2","qq"]' -p acc2
#cleos push action accballot vote '["acc3","163"]' -p acc3
#cleos push action accballot vote '["acc4","qq"]' -p acc4
#cleos push action accballot delegate '["acc5","acc3"]' -p acc5

9.查看票数最多的获胜结果

cleos push action accballot winproposal '[]' -p acc1
executed transaction: a30ce81cfc3bb5eaf51e8dbbe8ff88723af3f46f1ba8c69c434aa95917aecf81  96 bytes  941 us
      accballot <= accballot::winproposal       {}
>> win posposal is: qqvote count3

10.全部投票状态

148655ms thread-0   apply_context.cpp:29          print_debug          ]
[(accballot,allproposal)->accballot]: CONSOLE OUTPUT BEGIN =====================
 posposal 0:163vote count2
 posposal 0:360vote count0
 posposal 0:alibabavote count0
 posposal 0:baiduvote count0
 posposal 0:qqvote count3
 posposal 0:yyvote count0

[(accballot,allproposal)->accballot]: CONSOLE OUTPUT END   =====================

注意避坑

• 函数名不支持大写字母，不支持下划线，不能超过12个字符长度
• 结构体名不要使用大写，持久化的数据表操作会受影响（类名大写暂未碰到问题）