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Distribution

Solidity Interface & ABI​

Distribution.sol is an interface through which Solidity contracts can interact with Cosmos SDK distribution. This is convenient for developers as they don’t need to know the implementation details behind the x/distribution module in the Cosmos SDK. Instead, they can interact with distribution functions using the Ethereum interface they are familiar with.

Interface Distribution.sol​

Find the Solidity interface in the evmos/extensions repo.

ABI​

Find the ABI in the evmos/extensions repo.

Transactions​

  • setWithdrawAddress

    /// @dev Change the address, that can withdraw the rewards of a delegator.
    /// Note that this address cannot be a module account.
    /// @param delegatorAddress The address of the delegator
    /// @param withdrawerAddress The address that will be capable of withdrawing rewards for
    /// the given delegator address
    function setWithdrawAddress(
        address delegatorAddress,
        string memory withdrawerAddress
    ) external returns (bool success);

  • withdrawDelegatorRewards

    /// @dev Withdraw the rewards of a delegator from a validator
    /// @param delegatorAddress The address of the delegator
    /// @param validatorAddress The address of the validator
    /// @return amount The amount of Coin withdrawn
    function withdrawDelegatorRewards(
        address delegatorAddress,
        string memory validatorAddress
    )
    external
    returns (
        Coin[] calldata amount
    );

  • withdrawValidatorCommission

    /// @dev Withdraws the rewards commission of a validator.
    /// @param validatorAddress The address of the validator
    /// @return amount The amount of Coin withdrawn
    function withdrawValidatorCommission(
        string memory validatorAddress
    )
    external
    returns (
        Coin[] calldata amount
    );

Queries​

  • validatorDistribution

    /// @dev Queries validator commission and self-delegation rewards for validator.
    /// @param validatorAddress The address of the validator
    /// @return distributionInfo The validator's distribution info
    function validatorDistributionInfo(
        string memory validatorAddress
    )
    external
    view
    returns (
        ValidatorDistributionInfo calldata distributionInfo
    );

  • validatorOutstandingRewards

    /// @dev Queries the outstanding rewards of a validator address.
    /// @param validatorAddress The address of the validator
    /// @return rewards The validator's outstanding rewards
    function validatorOutstandingRewards(
        string memory validatorAddress
    )
    external
    view
    returns (
        DecCoin[] calldata rewards
    );

  • validatorCommission

    /// @dev Queries the accumulated commission for a validator.
    /// @param validatorAddress The address of the validator
    /// @return commission The validator's commission
    function validatorCommission(
        string memory validatorAddress
    )
    external
    view
    returns (
        DecCoin[] calldata commission
    );

  • validatorSlashes

    /// @dev Queries the slashing events for a validator in a given height interval
    /// defined by the starting and ending height.
    /// @param validatorAddress The address of the validator
    /// @param startingHeight The starting height
    /// @param endingHeight The ending height
    /// @return slashes The validator's slash events
    /// @return pageResponse The pagination response for the query
    function validatorSlashes(
        string memory validatorAddress,
        uint64 startingHeight,
        uint64 endingHeight
    )
    external
    view
    returns (
        ValidatorSlashEvent[] calldata slashes,
        PageResponse calldata pageResponse
    );

  • delegationRewards

    /// @dev Queries the total rewards accrued by a delegation from a specific address to a given validator.
    /// @param delegatorAddress The address of the delegator
    /// @param validatorAddress The address of the validator
    /// @return rewards The total rewards accrued by a delegation.
    function delegationRewards(
        address delegatorAddress,
        string memory validatorAddress
    )
    external
    view
    returns (
        DecCoin[] calldata rewards
    );

  • delegationTotalRewards

    /// @dev Queries the total rewards accrued by each validator, that a given
    /// address has delegated to.
    /// @param delegatorAddress The address of the delegator
    /// @return rewards The total rewards accrued by each validator for a delegator.
    /// @return total The total rewards accrued by a delegator.
    function delegationTotalRewards(
        address delegatorAddress
    )
    external
    view
    returns (
        DelegationDelegatorReward[] calldata rewards,
        DecCoin[] calldata total
    );

  • delegatorValidators

    /// @dev Queries all validators, that a given address has delegated to.
    /// @param delegatorAddress The address of the delegator
    /// @return validators The addresses of all validators, that were delegated to by the given address.
    function delegatorValidators(
        address delegatorAddress
    ) external view returns (string[] calldata validators);

  • delegatorWithdrawAddress

    delegatorWithdrawAddress queries withdraw address of a delegator

    /// @dev Queries the address capable of withdrawing rewards for a given delegator.
    /// @param delegatorAddress The address of the delegator
    /// @return withdrawAddress The address capable of withdrawing rewards for the delegator.
    function delegatorWithdrawAddress(
        address delegatorAddress
    ) external view returns (string memory withdrawAddress);

Events​

Each of the transactions emits its corresponding event. These are:

  • SetWithdrawerAddress

    /// @dev SetWithdrawerAddress defines an Event emitted when a new withdrawer address is being set
    /// @param caller the caller of the transaction
    /// @param withdrawerAddress the newly set withdrawer address
    event SetWithdrawerAddress(
        address indexed caller,
        string withdrawerAddress
    );

  • WithdrawDelegatorRewards

    /// @dev WithdrawDelegatorRewards defines an Event emitted when rewards from a delegation are withdrawn
    /// @param delegatorAddress the address of the delegator
    /// @param validatorAddress the address of the validator
    /// @param amount the amount being withdrawn from the delegation
    event WithdrawDelegatorRewards(
        address indexed delegatorAddress,
        string indexed validatorAddress,
        uint256 amount
    );

  • WithdrawValidatorCommission

    /// @dev WithdrawValidatorCommission defines an Event emitted when validator commissions are being withdrawn
    /// @param validatorAddress is the address of the validator
    /// @param commission is the total commission earned by the validator
    event WithdrawValidatorCommission(
        string indexed validatorAddress,
        uint256 commission
    );

Interact with the Solidity Interface​

Below are some examples of how to interact with this Solidity interface from your smart contracts.

Make sure to import the precompiled interface, e.g.:

import "https://github.com/evmos/extensions/blob/main/precompiles/stateful/Distribution.sol";

Set withdraw address​

The changeWithdrawAddress function allows a user to set a new withdraw address in the Cosmos x/distribution module. For this transaction to be successful, make sure the user had already approved the MSG_SET_WITHDRAWER_ADDRESS message.

function changeWithdrawAddress(
    string memory _withdrawAddr
) public returns (bool) {
    return
        distribution.DISTRIBUTION_CONTRACT.setWithdrawAddress(
            msg.sender,
            _withdrawAddr
        );
}

Withdraw staking rewards​

The withdrawStakingRewards function allows a user to withdraw his/her rewards corresponding to a specified validator. For this transaction to be successful, make sure the user had already approved the MSG_WITHDRAW_DELEGATOR_REWARD message.

function withdrawStakingRewards(
    string memory _valAddr
) public returns (types.Coin[] memory) {
    return
        distribution.DISTRIBUTION_CONTRACT.withdrawDelegatorRewards(
            msg.sender,
            _valAddr
        );
}

Withdraw validator commission​

If the user is running a validator, he/she could withdraw the corresponding commission using a smart contract. The user could use a function similar to withdrawCommission. For this transaction to be successful, make sure the user had already approved the MSG_WITHDRAW_VALIDATOR_COMMISSION message.

function withdrawCommission(
    string memory _valAddr
) public returns (types.Coin[] memory) {
    return
        distribution.DISTRIBUTION_CONTRACT.withdrawValidatorCommission(
            _valAddr
        );
}

Queries​

Similarly to transactions, smart contracts can use query methods. These are read-only methods. Examples of this are the getDelegationRewards and getValidatorCommision functions that return the information for the specified validator address.

getDelegationRewards(
    string memory _valAddr
) public view returns (types.DecCoin[] memory) {
    return
        distribution.DISTRIBUTION_CONTRACT.delegationRewards(
            msg.sender,
            _valAddr
        );
}

function getValidatorCommission(
    string memory _valAddr
) public view returns (types.DecCoin[] memory) {
    return distribution.DISTRIBUTION_CONTRACT.validatorCommission(_valAddr);
}