65 lines
2.2 KiB
Go
65 lines
2.2 KiB
Go
package types
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import (
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"time"
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sdk "github.com/cosmos/cosmos-sdk/types"
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sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
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)
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var _ FeeAllowanceI = (*BasicFeeAllowance)(nil)
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// Accept can use fee payment requested as well as timestamp/height of the current block
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// to determine whether or not to process this. This is checked in
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// Keeper.UseGrantedFees and the return values should match how it is handled there.
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//
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// If it returns an error, the fee payment is rejected, otherwise it is accepted.
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// The FeeAllowance implementation is expected to update it's internal state
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// and will be saved again after an acceptance.
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//
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// If remove is true (regardless of the error), the FeeAllowance will be deleted from storage
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// (eg. when it is used up). (See call to RevokeFeeAllowance in Keeper.UseGrantedFees)
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func (a *BasicFeeAllowance) Accept(ctx sdk.Context, fee sdk.Coins, _ []sdk.Msg) (bool, error) {
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blockTime := ctx.BlockTime()
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blockHeight := ctx.BlockHeight()
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if a.Expiration.IsExpired(&blockTime, blockHeight) {
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return true, sdkerrors.Wrap(ErrFeeLimitExpired, "basic allowance")
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}
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if a.SpendLimit != nil {
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left, invalid := a.SpendLimit.SafeSub(fee)
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if invalid {
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return false, sdkerrors.Wrap(ErrFeeLimitExceeded, "basic allowance")
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}
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a.SpendLimit = left
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return left.IsZero(), nil
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}
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return false, nil
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}
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// PrepareForExport will adjust the expiration based on export time. In particular,
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// it will subtract the dumpHeight from any height-based expiration to ensure that
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// the elapsed number of blocks this allowance is valid for is fixed.
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func (a *BasicFeeAllowance) PrepareForExport(dumpTime time.Time, dumpHeight int64) FeeAllowanceI {
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return &BasicFeeAllowance{
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SpendLimit: a.SpendLimit,
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Expiration: a.Expiration.PrepareForExport(dumpTime, dumpHeight),
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}
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}
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// ValidateBasic implements FeeAllowance and enforces basic sanity checks
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func (a BasicFeeAllowance) ValidateBasic() error {
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if a.SpendLimit != nil {
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if !a.SpendLimit.IsValid() {
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return sdkerrors.Wrapf(sdkerrors.ErrInvalidCoins, "send amount is invalid: %s", a.SpendLimit)
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}
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if !a.SpendLimit.IsAllPositive() {
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return sdkerrors.Wrap(sdkerrors.ErrInvalidCoins, "spend limit must be positive")
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}
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}
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return a.Expiration.ValidateBasic()
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}
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