OpenZeppelin

1.10.0

Crowdsale

contract Crowdsale

Crowdsale is a base contract for managing a token crowdsale, allowing investors to purchase tokens with ether. This contract implements such functionality in its most fundamental form and can be extended to provide additional functionality and/or custom behavior. The external interface represents the basic interface for purchasing tokens, and conform the base architecture for crowdsales. They are *not* intended to be modified / overriden. The internal interface conforms the extensible and modifiable surface of crowdsales. Override the methods to add functionality. Consider using 'super' where appropiate to concatenate behavior.

Source: crowdsale/Crowdsale.sol

Index

Reference

Events

  • TokenPurchase

    event TokenPurchase(address purchaser, address beneficiary, uint256 value, uint256 amount)

    Event for token purchase logging.

    Parameters:
    purchaser - who paid for the tokens
    beneficiary - who got the tokens
    value - weis paid for purchase
    amount - amount of tokens purchased

Functions

  • _deliverTokens

    function _deliverTokens(address _beneficiary, uint256 _tokenAmount) internal

    Source of tokens. Override this method to modify the way in which the crowdsale ultimately gets and sends its tokens.

    Parameters:
    _beneficiary - Address performing the token purchase
    _tokenAmount - Number of tokens to be emitted

  • _forwardFunds

    function _forwardFunds() internal

    Determines how ETH is stored/forwarded on purchases.

  • _getTokenAmount

    function _getTokenAmount(uint256 _weiAmount) internal view returns (uint256)

    Override to extend the way in which ether is converted to tokens.

    Parameters:
    _weiAmount - Value in wei to be converted into tokens
    Returns:
    Number of tokens that can be purchased with the specified _weiAmount

  • _postValidatePurchase

    function _postValidatePurchase(address _beneficiary, uint256 _weiAmount) internal

    Validation of an executed purchase. Observe state and use revert statements to undo rollback when valid conditions are not met.

    Parameters:
    _beneficiary - Address performing the token purchase
    _weiAmount - Value in wei involved in the purchase

  • _preValidatePurchase

    function _preValidatePurchase(address _beneficiary, uint256 _weiAmount) internal

    Validation of an incoming purchase. Use require statements to revert state when conditions are not met. Use super to concatenate validations.

    Parameters:
    _beneficiary - Address performing the token purchase
    _weiAmount - Value in wei involved in the purchase

  • _processPurchase

    function _processPurchase(address _beneficiary, uint256 _tokenAmount) internal

    Executed when a purchase has been validated and is ready to be executed. Not necessarily emits/sends tokens.

    Parameters:
    _beneficiary - Address receiving the tokens
    _tokenAmount - Number of tokens to be purchased

  • _updatePurchasingState

    function _updatePurchasingState(address _beneficiary, uint256 _weiAmount) internal

    Override for extensions that require an internal state to check for validity (current user contributions, etc.).

    Parameters:
    _beneficiary - Address receiving the tokens
    _weiAmount - Value in wei involved in the purchase

  • buyTokens

    function buyTokens(address _beneficiary) public payable

    Low level token purchase ***DO NOT OVERRIDE***.

    Parameters:
    _beneficiary - Address performing the token purchase

  • fallback

    function (uint256 _rate, address _wallet, ERC20 _token) public
    Parameters:
    _rate - Number of token units a buyer gets per wei
    _wallet - Address where collected funds will be forwarded to
    _token - Address of the token being sold

  • fallback

    function () external payable

    Fallback function ***DO NOT OVERRIDE***.

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