ERC20 Contract Exameple

This section will show how to compile, deploy, and call ERC20 token contracts.

If you are not yet familiar with how to develop and deploy contracts based on SCDO, it is recommended to read Development and Deployment Contract Process Based on SCDO first, after trying the basic contract deployment successfully, redevelopment and deployment of ERC20 token contract.

An example of an ERC20 token contract

Here we use an LKBT token contract as an example, which contains a library call.

pragma solidity ^0.4.24;


library IterableMapping {
  struct itmap
  {
    mapping(address => IndexValue) data;
    KeyFlag[] keys;
    uint size;
  }
  struct IndexValue { uint keyIndex; uint value; }
  struct KeyFlag { address key; bool deleted; }
  function insert(itmap storage self, address key, uint value) public returns (bool replaced)
  {
    uint keyIndex = self.data[key].keyIndex;
    self.data[key].value = value;
    if (keyIndex > 0)
      return true;
    else
    {
      keyIndex = self.keys.length++;
      self.data[key].keyIndex = keyIndex + 1;
      self.keys[keyIndex].key = key;
      self.size++;
      return false;
    }
  }
  function iterate_start(itmap storage self) public view returns (uint keyIndex)
  {
    return iterate_next(self, uint(-1));
  }
  function iterate_valid(itmap storage self, uint keyIndex) public view returns (bool)
  {
    return keyIndex < self.keys.length;
  }
  function iterate_next(itmap storage self, uint keyIndex) public view returns (uint)
  {
    uint _tmpKeyIndex = keyIndex;
    _tmpKeyIndex++;
    while (_tmpKeyIndex < self.keys.length && self.keys[_tmpKeyIndex].deleted)
      _tmpKeyIndex++;
    return _tmpKeyIndex;
  }
  function iterate_get(itmap storage self, uint keyIndex) public view returns (address key, uint value)
  {
    key = self.keys[keyIndex].key;
    value = self.data[key].value;
  }
  function iterate_getValue(itmap storage self, address key) public view returns (uint value) {
      return self.data[key].value;
  }
}

// File: zeppelin-solidity/contracts/ownership/Ownable.sol

/**
 * @title Ownable
 * @dev The Ownable contract has an owner address, and provides basic authorization control
 * functions, this simplifies the implementation of "user permissions".
 */
contract Ownable {
  address public owner;


  event OwnershipTransferred(address indexed previousOwner, address indexed newOwner);


  /**
   * @dev The Ownable constructor sets the original `owner` of the contract to the sender
   * account.
   */
    constructor () public {
        owner = msg.sender;
    }

  /**
   * @dev Throws if called by any account other than the owner.
   */
  modifier onlyOwner() {
    require(msg.sender == owner,"called by any account other than the owner");
    _;
  }


  /**
   * @dev Allows the current owner to transfer control of the contract to a newOwner.
   * @param newOwner The address to transfer ownership to.
   */
  function transferOwnership(address newOwner) public onlyOwner {
    require(newOwner != address(0),"owner address should not 0");
    emit OwnershipTransferred(owner, newOwner);
    owner = newOwner;
  }

}

// File: zeppelin-solidity/contracts/lifecycle/Pausable.sol

/**
 * @title Pausable
 * @dev Base contract which allows children to implement an emergency stop mechanism.
 */
contract Pausable is Ownable {
  event Pause();
  event Unpause();

  bool public paused = false;


  /**
   * @dev Modifier to make a function callable only when the contract is not paused.
   */
  modifier whenNotPaused() {
    require(!paused,"callable when the contract is not paused");
    _;
  }

  /**
   * @dev Modifier to make a function callable only when the contract is paused.
   */
  modifier whenPaused() {
    require(paused,"callable when the contract is paused");
    _;
  }

  /**
   * @dev called by the owner to pause, triggers stopped state
   */
  function pause() public onlyOwner whenNotPaused {
    paused = true;
    emit Pause();
  }

  /**
   * @dev called by the owner to unpause, returns to normal state
   */
  function unpause() public onlyOwner whenPaused  {
    paused = false;
    emit Unpause();
  }
}

/**
 * @title SafeMath
 * @dev Math operations with safety checks that throw on error
 */
library SafeMath {

  /**
  * @dev Multiplies two numbers, throws on overflow.
  */
  function mul(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    // Gas optimization: this is cheaper than asserting 'a' not being zero, but the
    // benefit is lost if 'b' is also tested.
    // See: https://github.com/OpenZeppelin/openzeppelin-solidity/pull/522
    if (_a == 0) {
      return 0;
    }

    c = _a * _b;
    assert(c / _a == _b);
    return c;
  }

  /**
  * @dev Integer division of two numbers, truncating the quotient.
  */
  function div(uint256 _a, uint256 _b) internal pure returns (uint256) {
    assert(_b > 0); // Solidity automatically throws when dividing by 0
    uint256 c = _a / _b;
    assert(_a == _b * c + _a % _b); // There is no case in which this doesn't hold
    return _a / _b;
  }

  /**
  * @dev Subtracts two numbers, throws on overflow (i.e. if subtrahend is greater than minuend).
  */
  function sub(uint256 _a, uint256 _b) internal pure returns (uint256) {
    assert(_b <= _a);
    return _a - _b;
  }

  /**
  * @dev Adds two numbers, throws on overflow.
  */
  function add(uint256 _a, uint256 _b) internal pure returns (uint256 c) {
    c = _a + _b;
    assert(c >= _a);
    return c;
  }
}

/**
 * @title ERC20Basic
 * @dev Simpler version of ERC20 interface
 * See https://github.com/ethereum/EIPs/issues/179
 */
contract ERC20Basic {
  function totalSupply() public view returns (uint256);
  function balanceOf(address _who) public view returns (uint256);
  function transfer(address _to, uint256 _value) public returns (bool);
  event Transfer(address indexed from, address indexed to, uint256 value);
}


/**
 * @title Basic token
 * @dev Basic version of StandardToken, with no allowances.
 */
contract BasicToken is ERC20Basic {
  using SafeMath for uint256;
  IterableMapping.itmap balances;

  uint256 internal totalSupply_;

  /**
  * @dev Total number of tokens in existence
  */
  function totalSupply() public view returns (uint256) {
    return totalSupply_;
  }

  /**
  * @dev Transfer token for a specified address
  * @param _to The address to transfer to.
  * @param _value The amount to be transferred.
  */
  function transfer(address _to, uint256 _value) public returns (bool) {

    require(_value <= IterableMapping.iterate_getValue(balances, msg.sender),"not enough balances");
    require(_to != address(0),"0 address not allow");

    IterableMapping.insert(balances, msg.sender, IterableMapping.iterate_getValue(balances, msg.sender).sub(_value));
    IterableMapping.insert(balances, _to, IterableMapping.iterate_getValue(balances, _to).add(_value));
    emit Transfer(msg.sender, _to, _value);
    return true;
  }

  /**
  * @dev Gets the balance of the specified address.
  * @param _owner The address to query the the balance of.
  * @return An uint256 representing the amount owned by the passed address.
  */
  function balanceOf(address _owner) public view returns (uint256) {
      return IterableMapping.iterate_getValue(balances, _owner);
  }

}



/**
 * @title ERC20 interface
 * @dev see https://github.com/ethereum/EIPs/issues/20
 */
contract ERC20 is ERC20Basic {
  function allowance(address _owner, address _spender)
    public view returns (uint256);

  function transferFrom(address _from, address _to, uint256 _value)
    public returns (bool);

  function approve(address _spender, uint256 _value) public returns (bool);
  event Approval(
    address indexed owner,
    address indexed spender,
    uint256 value
  );
}

/**
 * @title Standard ERC20 token
 *
 * @dev Implementation of the basic standard token.
 * https://github.com/ethereum/EIPs/issues/20
 * Based on code by FirstBlood: https://github.com/Firstbloodio/token/blob/master/smart_contract/FirstBloodToken.sol
 */
contract StandardToken is ERC20, BasicToken {

  mapping (address => mapping (address => uint256)) internal allowed;


  /**
   * @dev Transfer tokens from one address to another
   * @param _from address The address which you want to send tokens from
   * @param _to address The address which you want to transfer to
   * @param _value uint256 the amount of tokens to be transferred
   */
  function transferFrom(
    address _from,
    address _to,
    uint256 _value
  )
    public
    returns (bool)
  {

    require(_value <= IterableMapping.iterate_getValue(balances, _from),"balance not enough");
    require(_value <= allowed[_from][msg.sender],"balance not enough");
    require(_to != address(0),"0 address not allow");

    IterableMapping.insert(balances, _from, IterableMapping.iterate_getValue(balances, _from).sub(_value));
    IterableMapping.insert(balances, _to, IterableMapping.iterate_getValue(balances, _to).add(_value));
    allowed[_from][msg.sender] = allowed[_from][msg.sender].sub(_value);
    emit Transfer(_from, _to, _value);
    return true;
  }

  /**
   * @dev Approve the passed address to spend the specified amount of tokens on behalf of msg.sender.
   * Beware that changing an allowance with this method brings the risk that someone may use both the old
   * and the new allowance by unfortunate transaction ordering. One possible solution to mitigate this
   * race condition is to first reduce the spender's allowance to 0 and set the desired value afterwards:
   * https://github.com/ethereum/EIPs/issues/20#issuecomment-263524729
   * @param _spender The address which will spend the funds.
   * @param _value The amount of tokens to be spent.
   */
  function approve(address _spender, uint256 _value) public returns (bool) {
    allowed[msg.sender][_spender] = _value;
    emit Approval(msg.sender, _spender, _value);
    return true;
  }

  /**
   * @dev Function to check the amount of tokens that an owner allowed to a spender.
   * @param _owner address The address which owns the funds.
   * @param _spender address The address which will spend the funds.
   * @return A uint256 specifying the amount of tokens still available for the spender.
   */
  function allowance(
    address _owner,
    address _spender
   )
    public
    view
    returns (uint256)
  {
    return allowed[_owner][_spender];
  }

  /**
   * @dev Increase the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To increment
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _addedValue The amount of tokens to increase the allowance by.
   */
  function increaseApproval(
    address _spender,
    uint256 _addedValue
  )
    public
    returns (bool)
  {
    allowed[msg.sender][_spender] = (
      allowed[msg.sender][_spender].add(_addedValue));
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

  /**
   * @dev Decrease the amount of tokens that an owner allowed to a spender.
   * approve should be called when allowed[_spender] == 0. To decrement
   * allowed value is better to use this function to avoid 2 calls (and wait until
   * the first transaction is mined)
   * From MonolithDAO Token.sol
   * @param _spender The address which will spend the funds.
   * @param _subtractedValue The amount of tokens to decrease the allowance by.
   */
  function decreaseApproval(
    address _spender,
    uint256 _subtractedValue
  )
    public
    returns (bool)
  {
    uint256 oldValue = allowed[msg.sender][_spender];
    if (_subtractedValue >= oldValue) {
      allowed[msg.sender][_spender] = 0;
    } else {
      allowed[msg.sender][_spender] = oldValue.sub(_subtractedValue);
    }
    emit Approval(msg.sender, _spender, allowed[msg.sender][_spender]);
    return true;
  }

}

/**
 * @title Pausable token
 *
 * @dev StandardToken modified with pausable transfers.
 **/

contract PausableToken is StandardToken, Pausable {

  function transfer(address _to, uint256 _value) public whenNotPaused returns (bool) {
    return super.transfer(_to, _value);
  }

  function transferFrom(address _from, address _to, uint256 _value) public whenNotPaused returns (bool) {
    return super.transferFrom(_from, _to, _value);
  }

  function approve(address _spender, uint256 _value) public whenNotPaused returns (bool) {
    return super.approve(_spender, _value);
  }

  function increaseApproval(address _spender, uint _addedValue) public whenNotPaused returns (bool success) {
    return super.increaseApproval(_spender, _addedValue);
  }

  function decreaseApproval(address _spender, uint _subtractedValue) public whenNotPaused returns (bool success) {
    return super.decreaseApproval(_spender, _subtractedValue);
  }
}

contract LKBT is PausableToken {
    string public name = "LKBT Token";
    string public symbol = "LKBT";
    uint8 public decimals = 18;
    uint256 public INITIAL_SUPPLY = 10000000000;

    constructor () public {
        totalSupply_ = INITIAL_SUPPLY;
        IterableMapping.insert(balances, msg.sender, INITIAL_SUPPLY);
    }

    function balancesStart() public view returns(uint256) {
        return IterableMapping.iterate_start(balances);
    }

    function balancesGetBool(uint256 num) public view returns(bool){
        return IterableMapping.iterate_valid(balances, num);
    }

    function balancesGetNext(uint256 num) public view returns(uint256) {
        return IterableMapping.iterate_next(balances, num);
    }
    function balancesGetValue(uint256 num) public view returns(address, uint256) {
        address key;
        uint256 value;
        (key, value) = IterableMapping.iterate_get(balances, num);
        return (key, value);
    }
}

Edit and Compile the Contracts

Use remix online editor to edit and compile the above contract. Note that the selection of the corresponding compiler version is consistent with the contract.

[Note: Using SCDO to deploy the contract, the recommended solidity version is 0.4.24-0.4.26.]

• Get the bytecode of IterableMapping Click R[un] on the right side of remix, select the contract IterableMapping, click [Deploy]. You can see the deployment details of the log window, copy the [Input] content, which is the bytecode of IterableMapping.

  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

  At the same time, the log also shows the contract address 0x5e72914535f202659083db3a02c984188fa26e9f after deployment

• Obtain LKBT contract bytecode Go back to the compile window on the right side of remix, select the LKBT contract, click bytecode to copy the information after the contract is compiled, and paste the content in a text editor. This is data in JSON format, where the object field value is the bytecode of the contract.

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The bytecode contains some special String _browser/LKBTCoin.sol:IterableMapping_\, because the contract refers to IterableMapping. Replace this part of the content with the address of the IterableMapping contract, which is the bytecode content finally deployed by the contract.

Deploy contract

Prerequisites for deploying the contract

1. Before deploying the contract, please make sure that you are running the SCDO full node correctly and synchronized to the current latest block height.

2. Please confirm which shard you want to deploy the contract to (shard 1-4)

3. Please confirm that you have an account in the shard and there is enough balance in the account for contract deployment

This example will use a shard 4 account to deploy the contract to shard 4.

Example contract deployment steps

1. Deploy IterableMapping contract

./client sendtx --amount 0 --from 4S0491daa1d3df8a0b84027eb75db328f1300557f1-shard4.json  --gas 20000000 --payload 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 -a 127.0.0.1:8026

Result:

account: 4S0491daa1d3df8a0b84027eb75db328f1300557f1, transaction nonce: 3
transaction sent successfully
{
        "Hash": "0x66419b4dcb8312c2c1f7a89036987d6bbcadb1113653e43db3f0f76ee62a9587",
        "Data": {
                "Type": 0,
                "From": "4S0491daa1d3df8a0b84027eb75db328f1300557f1",
                "To": "0S0000000000000000000000000000000000000000",
                "Amount": 0,
                "AccountNonce": 3,
                "GasPrice": 10,
                "GasLimit": 20000000,
                "Timestamp": 0,
                "Payload": "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"
        },
        "Signature": {
                "Sig": "Yl1HZUwfjkwQk/8CjwP4PKuAdek+d91PDA0h2XLAc5d7fBJSabf2zhqRGHam223psQaMNbmbFaZfeSy3iMGH/wA="
        }
}

./client getreceipt --hash 0x66419b4dcb8312c2c1f7a89036987d6bbcadb1113653e43db3f0f76ee62a9587 -a localhost:8026

Receipt：

{
        "contract": "0xbab79f5f0d136db78e5df967a48006f1d5360032",
        "failed": false,
        "poststate": "0x179fcde02a3d218e83e78572e38a35d22ccc80d4664873da5414ad247627b622",
        "result": "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",
        "totalFee": 4479770,
        "txhash": "0x66419b4dcb8312c2c1f7a89036987d6bbcadb1113653e43db3f0f76ee62a9587",
        "usedGas": 447977
}

Failed is false, indicating that the contract was successfully deployed. The contract address is 0xbab79f5f0d136db78e5df967a48006f1d5360032. The [contract] can be found in the SCDO block explorer

1. Deploy the LKBT contract

   Replace _browser/LKBTCoin.sol:IterableMapping_ in the bytecode of the LKBT contract obtained in the compilation step with the contract address bab79f5f0d136db78e5df967a48006f1d5360032 in the previous step

 ./client sendtx --amount 0 --from 4S0491daa1d3df8a0b84027eb75db328f1300557f1-shard4.json --gas 200000000 --payload 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-a localhost:8026

The execution results are as follows:

 account: 4S0491daa1d3df8a0b84027eb75db328f1300557f1, transaction nonce: 4
 transaction sent successfully
 {
         "Hash": "0x2102f7fc21038c875bde5a98b32084e232c7249093f33e4a21c49bb7017f4e75",
         "Data": {
                 "Type": 0,
                 "From": "4S0491daa1d3df8a0b84027eb75db328f1300557f1",
                 "To": "0S0000000000000000000000000000000000000000",
                 "Amount": 0,
                 "AccountNonce": 4,
                 "GasPrice": 10,
                 "GasLimit": 200000000,
                 "Timestamp": 0,
                 "Payload": "0x6080604052600060056
                 ...
                 e4860937d530e1dd266cbb89b3c5b7f6be05431dee37e7120331cc0029"
        },
        "Signature": {
                "Sig": "GYWXGK03gZEy32mA4MfiOlnfWoAAGpH2fLbYx84hoeIFsQ9l27Bt9Jb4nUiN7dmfN3Kwq1qm7fTaGRQb4S+BKQE="
        }

receipt：

./client getreceipt --hash 0x2102f7fc21038c875bde5a98b32084e232c7249093f33e4a21c49bb7017f4e75 -a localhost:8026

result：

{
        "contract": "0x8e7e21c581652b6522bd855b9e9471e237370012",
        "failed": false,
        "poststate": "0x3525f59a4df7eb0aa992b3e843fdc0a6cad228738c114316df513b1c1679d445",
        "result": "0x60806040526004361061011d576000357c
        ...
        0e1dd266cbb89b3c5b7f6be05431dee37e7120331cc0029",
                "totalFee": 31897240,
                "txhash": "0x2102f7fc21038c875bde5a98b32084e232c7249093f33e4a21c49bb7017f4e75",
                "usedGas": 3189724
        }

You can see that the query result: "failed": false, indicating that the contract is deployed successfully. The contract address is 0x8e7e21c581652b6522bd855b9e9471e237370012.