EOS智能合约开发与交互

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#EOS智能合约开发与交互 #智能合约开发与交互 #智能合约开发 #EOS智能合约开发

于 2019-08-01 19:20:14 首次发布

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本文详细介绍了EOS智能合约的开发流程，包括启动节点服务、初始化钱包和账户，以及逐步构建和部署计数器合约，展示了如何实现计数状态的持久化和账户隔离。通过实际操作示例，读者可以深入理解EOS智能合约的交互机制。

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EOS智能合约的开发、编译、部署与交互。

## 运行示例代码

### 1、启动节点服务

在1#终端启动nodeos，建议先清除历史数据：

```
~$ rm -rf ~/.local/share/eosio/nodeos/data
~$ nodeos
```

在2#终端启动keosd：

```
~$ keosd
```

### 2、初始化钱包和账户

进入3#终端，执行以下脚本初始化默认钱包，并创建三个账户：

```
~$ init-wallet.sh
~$ new-account.sh sodfans
~$ new-account.sh jack
~$ new-account.sh pony
```

### 3、基本计数器合约

在3#终端进入~/repo/chapter4目录，执行以下脚本构建并部署合约：

```
~$ cd ~/repo/chapter4
~/repo/chapter4$ build-contract.sh counter.cpp
~/repo/chapter4$ deploy-contract.sh sodfans build/counter
```

使用cleos与计数器合约交互：

```
~/repo/chapter4$ cleos push action sodfans increase '[]' -p sodfans
```

### 4、识别交易执行者

执行以下脚本构建并部署合约：

```
~/repo/chapter4$ build-contract.sh counter-with-id.cpp
~/repo/chapter4$ deploy-contract.sh sodfans build/counter-with-id
```

使用cleos与计数器合约交互：

```
~/repo/chapter4$ cleos push action sodfans increase '["sodfans"]' -p sodfans
```

### 5、计数状态持久化

执行以下脚本构建并部署合约：

```
~/repo/chapter4$ build-contract.sh counter-with-table.cpp
~/repo/chapter4$ deploy-contract.sh sodfans build/counter-with-table
```

使用cleos与计数器合约交互：

```
~/repo/chapter4$ cleos push action sodfans increase '["sodfans"]' -p sodfans
```

### 6、使用scope隔离不同账户的状态

执行以下脚本构建并部署合约：

```
~$ cd ~/repo/chapter4
~/repo/chapter4$ build-contract.sh counter-with-scope.cpp
~/repo/chapter4$ deploy-contract.sh sodfans build/counter-with-scope
```

使用cleos与计数器合约交互：

```
~/repo/chapter4$ cleos push action sodfans increase '["jack"]' -p jack
~/repo/chapter4$ cleos push action sodfans increase '["pony"]' -p pony
```

## 文件目录组织

- counter.cpp：基本计数器合约，无持久化状态

#include <eosiolib/eosio.hpp>

class counter_contract:eosio::contract{
  public:
    counter_contract(account_name self):eosio::contract(self){}
    void increase(){
      eosio::print("INCREASE => ",value++);
    }
    void decrease(){
      eosio::print("DECREASE => ",value--);
    }
  private:
    uint64_t value;
};

EOSIO_ABI(counter_contract,(increase)(decrease))

- counter-with-id.cpp：检测交易执行账户的计数器合约

#include <eosiolib/eosio.hpp>

class counter_contract:eosio::contract{
  public:
    counter_contract(account_name self):eosio::contract(self){}
    void increase(account_name actor){
      eosio::require_auth(actor);
      eosio::print(eosio::name{actor} , " INCREASE => ",value++);
    }
    void decrease(account_name actor){
      eosio::print(eosio::name{actor} , " DECREASE => ",value--);
    }
  private:
    uint64_t value;
};

EOSIO_ABI(counter_contract,(increase)(decrease))

- counter-with-table.cpp：具有持久化状态的计数器合约

#include <eosiolib/eosio.hpp>

//@abi table
struct counter{
  uint64_t actor;
  uint64_t value;
  uint64_t primary_key() const { return actor; }
};
typedef eosio::multi_index<N(counter),counter> counter_table;

class counter_contract:eosio::contract{
  public:
    counter_contract(account_name self):eosio::contract(self){}
    void increase(account_name actor){
      eosio::require_auth(actor);
      value = get_value(actor);
      eosio::print(eosio::name{actor} , " INCREASE => ",value++);
      update_value(actor,value);
    }
    void decrease(account_name actor){
      eosio::print(eosio::name{actor} , " DECREASE => ",value--);
    }
  private:
    uint64_t value;
  
  	uint64_t get_value(account_name actor){
      counter_table c(_self,_self);
      auto iter = c.find(actor);

      if(iter != c.end()) return iter->value;
      
      c.emplace(actor,[&](auto& record){
        record.actor = actor;
        record.value = 0;
      });
      
      return 0;      
    }
    
    void update_value(account_name actor,uint64_t value){
      counter_table c(_self,_self);
      auto iter = c.find(actor);
      c.modify(iter,actor,[&](auto& record){
        record.value = value;
      });
    }
};

EOSIO_ABI(counter_contract,(increase)(decrease))

- counter-with-scope.cpp：使用数据域隔离不同账户状态的计数器合约

#include <eosiolib/eosio.hpp>

//@abi table
struct counter{
  uint64_t actor;
  uint64_t value;
  uint64_t primary_key() const { return actor; }
};
typedef eosio::multi_index<N(counter),counter> counter_table;

class counter_contract:eosio::contract{
  public:
    counter_contract(account_name self):eosio::contract(self){}
    void increase(account_name actor){
      eosio::require_auth(actor);
      value = get_value(actor);
      eosio::print(eosio::name{actor} , " INCREASE => ",value++);
      update_value(actor,value);
    }
    void decrease(account_name actor){
      eosio::print(eosio::name{actor} , " DECREASE => ",value--);
    }
  private:
    uint64_t value;
  
  	uint64_t get_value(account_name actor){
      counter_table c(_self,actor);
      auto iter = c.find(actor);

      if(iter != c.end()) return iter->value;
      
      c.emplace(actor,[&](auto& record){
        record.actor = actor;
        record.value = 0;
      });
      
      return 0;      
    }
    
    void update_value(account_name actor,uint64_t value){
      counter_table c(_self,actor);
      auto iter = c.find(actor);
      c.modify(iter,actor,[&](auto& record){
        record.value = value;
      });
    }
};

EOSIO_ABI(counter_contract,(increase)(decrease))