feat: add type constructors/validation for genesis types.

modules/core/04-channel/v2/types/channel.go

@@ -32,3 +32,20 @@ func (c Channel) Validate() error {
 
 	return nil
 }
+
+// NewIdentifiedChannel creates a new IdentifiedChannel instance
+func NewIdentifiedChannel(channelID string, channel Channel) IdentifiedChannel {
+	return IdentifiedChannel{
+		Channel:   channel,
+		ChannelId: channelID,
+	}
+}
+
+// ValidateBasic performs a basic validation of the identifiers and channel fields.
+func (ic IdentifiedChannel) ValidateBasic() error {
+	if err := host.ChannelIdentifierValidator(ic.ChannelId); err != nil {
+		return errorsmod.Wrap(err, "invalid channel ID")
+	}
+
+	return ic.Channel.Validate()
+}

modules/core/04-channel/v2/types/genesis.go

@@ -0,0 +1,134 @@
+package types
+
+import (
+	"errors"
+	"fmt"
+
+	channeltypesv1 "github.com/cosmos/ibc-go/v9/modules/core/04-channel/types"
+	host "github.com/cosmos/ibc-go/v9/modules/core/24-host"
+)
+
+// NewPacketState creates a new PacketState instance.
+func NewPacketState(channelID string, sequence uint64, data []byte) PacketState {
+	return PacketState{
+		ChannelId: channelID,
+		Sequence:  sequence,
+		Data:      data,
+	}
+}
+
+// Validate performs basic validation of fields returning an error upon any failure.
+func (ps PacketState) Validate() error {
+	if ps.Data == nil {
+		return errors.New("data bytes cannot be nil")
+	}
+	return validateGenFields(ps.ChannelId, ps.Sequence)
+}
+
+// NewPacketSequence creates a new PacketSequences instance.
+func NewPacketSequence(channelID string, sequence uint64) PacketSequence {
+	return PacketSequence{
+		ChannelId: channelID,
+		Sequence:  sequence,
+	}
+}
+
+// Validate performs basic validation of fields returning an error upon any failure.
+func (ps PacketSequence) Validate() error {
+	return validateGenFields(ps.ChannelId, ps.Sequence)
+}
+
+// NewGenesisState creates a GenesisState instance.
+func NewGenesisState(
+	channels []IdentifiedChannel, acks, receipts, commitments []PacketState,
+	sendSeqs []PacketSequence, nextChannelSequence uint64,
+) GenesisState {
+	return GenesisState{
+		Channels:            channels,
+		Acknowledgements:    acks,
+		Receipts:            receipts,
+		Commitments:         commitments,
+		SendSequences:       sendSeqs,
+		NextChannelSequence: nextChannelSequence,
+	}
+}
+
+// DefaultGenesisState returns the ibc channel v2 submodule's default genesis state.
+func DefaultGenesisState() GenesisState {
+	return GenesisState{
+		Channels:            []IdentifiedChannel{},
+		Acknowledgements:    []PacketState{},
+		Receipts:            []PacketState{},
+		Commitments:         []PacketState{},
+		SendSequences:       []PacketSequence{},
+		NextChannelSequence: 0,
+	}
+}
+
+// Validate performs basic genesis state validation returning an error upon any failure.
+func (gs GenesisState) Validate() error {
+	// keep track of the max sequence to ensure it is less than
+	// the next sequence used in creating channel identifiers.
+	var maxSequence uint64
+
+	for i, channel := range gs.Channels {
+		sequence, err := channeltypesv1.ParseChannelSequence(channel.ChannelId)
+		if err != nil {
+			return err
+		}
+
+		if sequence > maxSequence {
+			maxSequence = sequence
+		}
+
+		if err := channel.ValidateBasic(); err != nil {
+			return fmt.Errorf("invalid channel %v channel index %d: %w", channel, i, err)
+		}
+	}
+
+	if maxSequence != 0 && maxSequence >= gs.NextChannelSequence {
+		return fmt.Errorf("next channel sequence %d must be greater than maximum sequence used in channel identifier %d", gs.NextChannelSequence, maxSequence)
+	}
+
+	for i, ack := range gs.Acknowledgements {
+		if err := ack.Validate(); err != nil {
+			return fmt.Errorf("invalid acknowledgement %v ack index %d: %w", ack, i, err)
+		}
+		if len(ack.Data) == 0 {
+			return fmt.Errorf("invalid acknowledgement %v ack index %d: data bytes cannot be empty", ack, i)
+		}
+	}
+
+	for i, receipt := range gs.Receipts {
+		if err := receipt.Validate(); err != nil {
+			return fmt.Errorf("invalid acknowledgement %v ack index %d: %w", receipt, i, err)
+		}
+	}
+
+	for i, commitment := range gs.Commitments {
+		if err := commitment.Validate(); err != nil {
+			return fmt.Errorf("invalid commitment %v index %d: %w", commitment, i, err)
+		}
+		if len(commitment.Data) == 0 {
+			return fmt.Errorf("invalid acknowledgement %v ack index %d: data bytes cannot be empty", commitment, i)
+		}
+	}
+
+	for i, ss := range gs.SendSequences {
+		if err := ss.Validate(); err != nil {
+			return fmt.Errorf("invalid send sequence %v index %d: %w", ss, i, err)
+		}
+	}
+
+	return nil
+}
+
+func validateGenFields(channelID string, sequence uint64) error {
+	if err := host.ChannelIdentifierValidator(channelID); err != nil {
+		return fmt.Errorf("invalid channel Id: %w", err)
+	}
+	if sequence == 0 {
+		return errors.New("sequence cannot be 0")
+	}
+	return nil
+}