Unify and flatten Input interfaces and types

api_v3.go

@@ -437,13 +437,13 @@ func V3API(protoParams ProtocolParameters) API {
 		must(api.RegisterTypeSettings(TransactionEssence{}, serix.TypeSettings{}.WithObjectType(TransactionEssenceNormal)))
 
 		must(api.RegisterTypeSettings(CommitmentInput{},
-			serix.TypeSettings{}.WithObjectType(uint8(ContextInputCommitment))),
+			serix.TypeSettings{}.WithObjectType(uint8(InputCommitment))),
 		)
 		must(api.RegisterTypeSettings(BlockIssuanceCreditInput{},
-			serix.TypeSettings{}.WithObjectType(uint8(ContextInputBlockIssuanceCredit))),
+			serix.TypeSettings{}.WithObjectType(uint8(InputBlockIssuanceCredit))),
 		)
 		must(api.RegisterTypeSettings(RewardInput{},
-			serix.TypeSettings{}.WithObjectType(uint8(ContextInputReward))),
+			serix.TypeSettings{}.WithObjectType(uint8(InputReward))),
 		)
 
 		must(api.RegisterTypeSettings(TxEssenceContextInputs{},

builder/transaction_builder.go

@@ -54,7 +54,7 @@ func (b *TransactionBuilder) AddInput(input *TxInput) *TransactionBuilder {
 type TransactionBuilderInputFilter func(outputID iotago.OutputID, input iotago.Output) bool
 
 // AddContextInput adds the given context input to the builder.
-func (b *TransactionBuilder) AddContextInput(contextInput iotago.ContextInput) *TransactionBuilder {
+func (b *TransactionBuilder) AddContextInput(contextInput iotago.Input) *TransactionBuilder {
 	b.essence.ContextInputs = append(b.essence.ContextInputs, contextInput)
 
 	return b
@@ -120,7 +120,7 @@ func (b *TransactionBuilder) Build(signer iotago.AddressSigner) (*iotago.Transac
 	var inputIDs iotago.OutputIDs
 	for _, input := range b.essence.Inputs {
 		//nolint:forcetypeassert // we can safely assume that this is an UTXOInput
-		inputIDs = append(inputIDs, input.(*iotago.UTXOInput).ID())
+		inputIDs = append(inputIDs, input.(*iotago.UTXOInput).OutputID())
 	}
 
 	inputs := inputIDs.OrderedSet(b.inputs)
@@ -139,7 +139,7 @@ func (b *TransactionBuilder) Build(signer iotago.AddressSigner) (*iotago.Transac
 	unlocks := iotago.Unlocks{}
 	for i, inputRef := range b.essence.Inputs {
 		//nolint:forcetypeassert // we can safely assume that this is an UTXOInput
-		addr := b.inputOwner[inputRef.(*iotago.UTXOInput).ID()]
+		addr := b.inputOwner[inputRef.(*iotago.UTXOInput).OutputID()]
 		addrKey := addr.Key()
 
 		pos, unlocked := unlockPos[addrKey]

builder/transaction_builder_test.go

@@ -31,7 +31,7 @@ func TestTransactionBuilder(t *testing.T) {
 			inputUTXO1 := &iotago.UTXOInput{TransactionID: tpkg.Rand32ByteArray(), TransactionOutputIndex: 0}
 			input := tpkg.RandBasicOutput(iotago.AddressEd25519)
 			bdl := builder.NewTransactionBuilder(tpkg.TestAPI).
-				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.ID(), Input: input}).
+				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.OutputID(), Input: input}).
 				AddOutput(&iotago.BasicOutput{
 					Amount: 50,
 					Conditions: iotago.BasicOutputUnlockConditions{
@@ -84,10 +84,10 @@ func TestTransactionBuilder(t *testing.T) {
 			)
 
 			bdl := builder.NewTransactionBuilder(tpkg.TestAPI).
-				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputID1.ID(), Input: basicOutput}).
-				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputID2.ID(), Input: nftOutput}).
-				AddInput(&builder.TxInput{UnlockTarget: nftOutput.Chain().ToAddress(), InputID: inputID3.ID(), Input: accountOwnedByNFT}).
-				AddInput(&builder.TxInput{UnlockTarget: accountOwnedByNFT.Chain().ToAddress(), InputID: inputID4.ID(), Input: basicOwnedByAccount}).
+				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputID1.OutputID(), Input: basicOutput}).
+				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputID2.OutputID(), Input: nftOutput}).
+				AddInput(&builder.TxInput{UnlockTarget: nftOutput.Chain().ToAddress(), InputID: inputID3.OutputID(), Input: accountOwnedByNFT}).
+				AddInput(&builder.TxInput{UnlockTarget: accountOwnedByNFT.Chain().ToAddress(), InputID: inputID4.OutputID(), Input: basicOwnedByAccount}).
 				AddOutput(&iotago.BasicOutput{
 					Amount: 4000,
 					Conditions: iotago.BasicOutputUnlockConditions{
@@ -105,7 +105,7 @@ func TestTransactionBuilder(t *testing.T) {
 			inputUTXO1 := &iotago.UTXOInput{TransactionID: tpkg.Rand32ByteArray(), TransactionOutputIndex: 0}
 
 			bdl := builder.NewTransactionBuilder(tpkg.TestAPI).
-				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.ID(), Input: tpkg.RandBasicOutput(iotago.AddressEd25519)}).
+				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.OutputID(), Input: tpkg.RandBasicOutput(iotago.AddressEd25519)}).
 				AddOutput(&iotago.BasicOutput{
 					Amount: 50,
 					Conditions: iotago.BasicOutputUnlockConditions{
@@ -124,7 +124,7 @@ func TestTransactionBuilder(t *testing.T) {
 			inputUTXO1 := &iotago.UTXOInput{TransactionID: tpkg.Rand32ByteArray(), TransactionOutputIndex: 0}
 
 			bdl := builder.NewTransactionBuilder(tpkg.TestAPI).
-				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.ID(), Input: tpkg.RandBasicOutput(iotago.AddressEd25519)}).
+				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.OutputID(), Input: tpkg.RandBasicOutput(iotago.AddressEd25519)}).
 				AddOutput(&iotago.BasicOutput{
 					Amount: 50,
 					Conditions: iotago.BasicOutputUnlockConditions{
@@ -149,7 +149,7 @@ func TestTransactionBuilder(t *testing.T) {
 			inputUTXO1 := &iotago.UTXOInput{TransactionID: tpkg.Rand32ByteArray(), TransactionOutputIndex: 0}
 
 			bdl := builder.NewTransactionBuilder(tpkg.TestAPI).
-				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.ID(), Input: tpkg.RandBasicOutput(iotago.AddressEd25519)}).
+				AddInput(&builder.TxInput{UnlockTarget: inputAddr, InputID: inputUTXO1.OutputID(), Input: tpkg.RandBasicOutput(iotago.AddressEd25519)}).
 				AddOutput(&iotago.BasicOutput{
 					Amount: 50,
 					Conditions: iotago.BasicOutputUnlockConditions{

commitment.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"github.com/iotaledger/hive.go/ierrors"
+	"github.com/iotaledger/hive.go/lo"
 	"github.com/iotaledger/hive.go/serializer/v2"
 )
 
@@ -49,6 +50,14 @@ func (c *Commitment) ID() (CommitmentID, error) {
 	return SlotIdentifierRepresentingData(c.Index, data), nil
 }
 
+func (c *Commitment) StateID() Identifier {
+	return IdentifierFromData(lo.PanicOnErr(c.MustID().Bytes()))
+}
+
+func (c *Commitment) Type() StateType {
+	return InputCommitment
+}
+
 func (c *Commitment) MustID() CommitmentID {
 	id, err := c.ID()
 	if err != nil {

input.go

@@ -7,25 +7,29 @@ import (
 	"github.com/iotaledger/hive.go/serializer/v2"
 )
 
-// InputType defines the type of inputs.
-type InputType byte
+// StateType defines the type of inputs.
+type StateType byte
 
 const (
 	// InputUTXO is a type of input which references an unspent transaction output.
-	InputUTXO InputType = iota
+	InputUTXO StateType = iota
+	// InputCommitment is a type of input which references a commitment.
+	InputCommitment
+	// InputBlockIssuanceCredit is a type of input which references the block issuance credit from a specific account and commitment, the latter being provided by a commitment input.
+	InputBlockIssuanceCredit
+	// InputReward is a type of input which references an Account or Delegation Input for which to claim rewards.
+	InputReward
 )
 
-func (inputType InputType) String() string {
+func (inputType StateType) String() string {
 	if int(inputType) >= len(inputNames) {
 		return fmt.Sprintf("unknown input type: %d", inputType)
 	}
 
 	return inputNames[inputType]
 }
 
-var (
-	inputNames = [InputUTXO + 1]string{"UTXOInput"}
-)
+var inputNames = [InputUTXO + 1]string{"UTXOInput"}
 
 var (
 	// ErrRefUTXOIndexInvalid gets returned on invalid UTXO indices.
@@ -68,23 +72,15 @@ func (in Inputs[T]) WorkScore(workScoreStructure *WorkScoreStructure) (WorkScore
 	return workScoreBytes, nil
 }
 
-// Input references a UTXO.
+// Input references a generic input.
 type Input interface {
 	Sizer
 	ProcessableObject
 
-	// Type returns the type of Input.
-	Type() InputType
-}
-
-// IndexedUTXOReferencer is a type of Input which references a UTXO by the transaction ID and output index.
-type IndexedUTXOReferencer interface {
-	Input
+	StateID() Identifier
 
-	// Ref returns the UTXO this Input references.
-	Ref() OutputID
-	// Index returns the output index of the UTXO this Input references.
-	Index() uint16
+	// Type returns the type of Input.
+	Type() StateType
 }
 
 // InputsSyntacticalValidationFunc which given the index of an input and the input itself, runs syntactical validations and returns an error if any should fail.
@@ -96,15 +92,15 @@ func InputsSyntacticalUnique() InputsSyntacticalValidationFunc {
 
 	return func(index int, input Input) error {
 		switch castInput := input.(type) {
-		case IndexedUTXOReferencer:
-			utxoRef := castInput.Ref()
+		case *UTXOInput:
+			utxoRef := castInput.OutputID()
 			k := string(utxoRef[:])
 			if j, has := utxoSet[k]; has {
 				return ierrors.Wrapf(ErrInputUTXORefsNotUnique, "input %d and %d share the same UTXO ref", j, index)
 			}
 			utxoSet[k] = index
 		default:
-			return ierrors.Wrapf(ErrUnknownInputType, "input %d, tx can only contain IndexedUTXOReferencer", index)
+			return ierrors.Wrapf(ErrUnknownInputType, "input %d, tx can only contain UTXO inputs", index)
 		}
 
 		return nil
@@ -115,12 +111,12 @@ func InputsSyntacticalUnique() InputsSyntacticalValidationFunc {
 func InputsSyntacticalIndicesWithinBounds() InputsSyntacticalValidationFunc {
 	return func(index int, input Input) error {
 		switch castInput := input.(type) {
-		case IndexedUTXOReferencer:
+		case *UTXOInput:
 			if castInput.Index() < RefUTXOIndexMin || castInput.Index() > RefUTXOIndexMax {
 				return ierrors.Wrapf(ErrRefUTXOIndexInvalid, "input %d", index)
 			}
 		default:
-			return ierrors.Wrapf(ErrUnknownInputType, "input %d, tx can only contain IndexedUTXOReferencer inputs", index)
+			return ierrors.Wrapf(ErrUnknownInputType, "input %d, tx can only contain UTXInput inputs", index)
 		}
 
 		return nil

input_block_issuance_credit.go

@@ -8,8 +8,12 @@ type BlockIssuanceCreditInput struct {
 	AccountID AccountID `serix:"0,mapKey=accountId"`
 }
 
-func (b *BlockIssuanceCreditInput) Type() ContextInputType {
-	return ContextInputBlockIssuanceCredit
+func (b *BlockIssuanceCreditInput) StateID() Identifier {
+	return IdentifierFromData(b.AccountID[:])
+}
+
+func (b *BlockIssuanceCreditInput) Type() StateType {
+	return InputBlockIssuanceCredit
 }
 
 func (b *BlockIssuanceCreditInput) Size() int {

input_commitment.go

@@ -8,8 +8,12 @@ type CommitmentInput struct {
 	CommitmentID CommitmentID `serix:"0,mapKey=commitmentId"`
 }
 
-func (c *CommitmentInput) Type() ContextInputType {
-	return ContextInputCommitment
+func (c *CommitmentInput) StateID() Identifier {
+	return IdentifierFromData(c.CommitmentID[:])
+}
+
+func (c *CommitmentInput) Type() StateType {
+	return InputCommitment
 }
 
 func (c *CommitmentInput) Size() int {

input_context.go

@@ -10,15 +10,6 @@ import (
 // ContextInputType defines the type of context inputs.
 type ContextInputType byte
 
-const (
-	// ContextInputCommitment is a type of input which references a commitment.
-	ContextInputCommitment ContextInputType = iota
-	// ContextInputBlockIssuanceCredit is a type of input which references the block issuance credit from a specific account and commitment, the latter being provided by a commitment input.
-	ContextInputBlockIssuanceCredit
-	// ContextInputReward is a type of input which references an Account or Delegation Input for which to claim rewards.
-	ContextInputReward
-)
-
 func (inputType ContextInputType) String() string {
 	if int(inputType) >= len(contextInputNames) {
 		return fmt.Sprintf("unknown input type: %d", inputType)
@@ -27,12 +18,10 @@ func (inputType ContextInputType) String() string {
 	return contextInputNames[inputType]
 }
 
-var (
-	contextInputNames = [ContextInputReward + 1]string{"CommitmentInput", "BlockIssuanceCreditInput", "RewardInput"}
-)
+var contextInputNames = [InputReward + 1]string{"CommitmentInput", "BlockIssuanceCreditInput", "RewardInput"}
 
 // ContextInputs is a slice of ContextInput.
-type ContextInputs[T ContextInput] []T
+type ContextInputs[T Input] []T
 
 func (in ContextInputs[T]) WorkScore(workScoreStructure *WorkScoreStructure) (WorkScore, error) {
 	// LengthPrefixType
@@ -65,18 +54,9 @@ func (in ContextInputs[T]) Size() int {
 	return sum
 }
 
-// ContextInput provides an additional contextual input for transaction validation.
-type ContextInput interface {
-	Sizer
-	ProcessableObject
-
-	// Type returns the type of ContextInput.
-	Type() ContextInputType
-}
-
 // ContextInputsSyntacticalValidationFunc which given the index of an input and the input itself,
 // runs syntactical validations and returns an error if any should fail.
-type ContextInputsSyntacticalValidationFunc func(index int, input ContextInput) error
+type ContextInputsSyntacticalValidationFunc func(index int, input Input) error
 
 // ContextInputsSyntacticalUnique returns a ContextInputsSyntacticalValidationFunc
 // which checks that
@@ -88,7 +68,7 @@ func ContextInputsSyntacticalUnique() ContextInputsSyntacticalValidationFunc {
 	bicSet := map[string]int{}
 	rewardSet := map[uint16]int{}
 
-	return func(index int, input ContextInput) error {
+	return func(index int, input Input) error {
 		switch castInput := input.(type) {
 		case *BlockIssuanceCreditInput:
 			accountID := castInput.AccountID
@@ -111,6 +91,8 @@ func ContextInputsSyntacticalUnique() ContextInputsSyntacticalValidationFunc {
 				return ierrors.Wrapf(ErrMultipleInputCommitments, "input %d is the second commitment input", index)
 			}
 			hasCommitment = true
+		case *UTXOInput:
+			// ignore as we are evaluating context inputs only
 		default:
 			return ierrors.Wrapf(ErrUnknownContextInputType, "context input %d, tx can only contain CommitmentInputs, BlockIssuanceCreditInputs or RewardInputs", index)
 		}

input_reward.go

@@ -1,6 +1,8 @@
 package iotago
 
 import (
+	"encoding/binary"
+
 	"github.com/iotaledger/hive.go/serializer/v2"
 )
 
@@ -9,8 +11,14 @@ type RewardInput struct {
 	Index uint16 `serix:"0,mapKey=index"`
 }
 
-func (r *RewardInput) Type() ContextInputType {
-	return ContextInputReward
+func (r *RewardInput) StateID() Identifier {
+	buf := make([]byte, 2)
+	binary.LittleEndian.PutUint16(buf, r.Index)
+	return IdentifierFromData(buf)
+}
+
+func (r *RewardInput) Type() StateType {
+	return InputReward
 }
 
 func (r *RewardInput) Size() int {

input_test.go

@@ -62,12 +62,12 @@ func TestInputsSyntacticalUnique(t *testing.T) {
 func TestContextInputsSyntacticalUnique(t *testing.T) {
 	tests := []struct {
 		name    string
-		inputs  iotago.ContextInputs[iotago.ContextInput]
+		inputs  iotago.ContextInputs[iotago.Input]
 		wantErr error
 	}{
 		{
 			name: "ok",
-			inputs: iotago.ContextInputs[iotago.ContextInput]{
+			inputs: iotago.ContextInputs[iotago.Input]{
 				&iotago.CommitmentInput{
 					CommitmentID: tpkg.Rand40ByteArray(),
 				},
@@ -88,7 +88,7 @@ func TestContextInputsSyntacticalUnique(t *testing.T) {
 		},
 		{
 			name: "fail - multiple commitment inputs",
-			inputs: iotago.ContextInputs[iotago.ContextInput]{
+			inputs: iotago.ContextInputs[iotago.Input]{
 				&iotago.CommitmentInput{
 					CommitmentID: tpkg.Rand40ByteArray(),
 				},
@@ -100,7 +100,7 @@ func TestContextInputsSyntacticalUnique(t *testing.T) {
 		},
 		{
 			name: "fail - block issuance credit inputs not unique",
-			inputs: iotago.ContextInputs[iotago.ContextInput]{
+			inputs: iotago.ContextInputs[iotago.Input]{
 				&iotago.BlockIssuanceCreditInput{
 					AccountID: [32]byte{},
 				},
@@ -112,7 +112,7 @@ func TestContextInputsSyntacticalUnique(t *testing.T) {
 		},
 		{
 			name: "fail - reward input not unique",
-			inputs: iotago.ContextInputs[iotago.ContextInput]{
+			inputs: iotago.ContextInputs[iotago.Input]{
 				&iotago.RewardInput{
 					Index: 1,
 				},
@@ -124,7 +124,7 @@ func TestContextInputsSyntacticalUnique(t *testing.T) {
 		},
 		{
 			name: "fail - reward input references index greater than max inputs count",
-			inputs: iotago.ContextInputs[iotago.ContextInput]{
+			inputs: iotago.ContextInputs[iotago.Input]{
 				&iotago.RewardInput{
 					Index: 1,
 				},