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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package transactions
import (
"github.com/algorand/go-algorand/crypto"
"github.com/algorand/go-algorand/protocol"
)
type (
// A Payset represents a common, unforgeable, consistent, ordered set of SignedTxn objects.
//msgp:allocbound Payset 100000
Payset []SignedTxnInBlock
)
// CommitFlat returns a commitment to the Payset, as a flat array.
func (payset Payset) CommitFlat() crypto.Digest {
return payset.commit(false)
}
// CommitGenesis is like Commit, but with special handling for zero-length
// but non-nil paysets.
func (payset Payset) CommitGenesis() crypto.Digest {
return payset.commit(true)
}
// commit handles the logic for both Commit and CommitGenesis
func (payset Payset) commit(genesis bool) crypto.Digest {
// We used to build up Paysets from a nil slice with `append` during
// block evaluation, meaning zero-length paysets would remain nil.
// After we started allocating them up front, we started calling Commit
// on zero-length but non-nil Paysets. However, we want payset
// encodings to remain the same with or without this optimization.
//
// Additionally, the genesis block commits to a zero-length but non-nil
// payset (the only block to do so), so we have to let the nil value
// pass through.
if !genesis && len(payset) == 0 {
payset = nil
}
return crypto.HashObj(payset)
}
// ToBeHashed implements the crypto.Hashable interface
func (payset Payset) ToBeHashed() (protocol.HashID, []byte) {
return protocol.PaysetFlat, protocol.Encode(payset)
}
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