keeper

package
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 Go to latest Published: Apr 19, 2023 License: MIT Imports: 25 Imported by: 0

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Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func EmitAcknowledgePacketEvent 

func EmitAcknowledgePacketEvent(ctx sdk.Context, packet exported.PacketI, channel types.Channel)

EmitAcknowledgePacketEvent emits an acknowledge packet event. It will be emitted both the first time a packet is acknowledged for a certain sequence and for all duplicate acknowledgements.

func EmitChannelCloseConfirmEvent 

func EmitChannelCloseConfirmEvent(ctx sdk.Context, portID string, channelID string, channel types.Channel)

EmitChannelCloseConfirmEvent emits a channel close confirm event

func EmitChannelCloseInitEvent 

func EmitChannelCloseInitEvent(ctx sdk.Context, portID string, channelID string, channel types.Channel)

EmitChannelCloseInitEvent emits a channel close init event

func EmitChannelClosedEvent 

func EmitChannelClosedEvent(ctx sdk.Context, packet exported.PacketI, channel types.Channel)

EmitChannelClosedEvent emits a channel closed event.

func EmitChannelOpenAckEvent 

func EmitChannelOpenAckEvent(ctx sdk.Context, portID string, channelID string, channel types.Channel)

EmitChannelOpenAckEvent emits a channel open acknowledge event

func EmitChannelOpenConfirmEvent 

func EmitChannelOpenConfirmEvent(ctx sdk.Context, portID string, channelID string, channel types.Channel)

EmitChannelOpenConfirmEvent emits a channel open confirm event

func EmitChannelOpenInitEvent 

func EmitChannelOpenInitEvent(ctx sdk.Context, portID string, channelID string, channel types.Channel)

EmitChannelOpenInitEvent emits a channel open init event

func EmitChannelOpenTryEvent 

func EmitChannelOpenTryEvent(ctx sdk.Context, portID string, channelID string, channel types.Channel)

EmitChannelOpenTryEvent emits a channel open try event

func EmitRecvPacketEvent 

func EmitRecvPacketEvent(ctx sdk.Context, packet exported.PacketI, channel types.Channel)

EmitRecvPacketEvent emits a receive packet event. It will be emitted both the first time a packet is received for a certain sequence and for all duplicate receives.

func EmitSendPacketEvent 

func EmitSendPacketEvent(ctx sdk.Context, packet exported.PacketI, channel types.Channel, timeoutHeight exported.Height)

EmitSendPacketEvent emits an event with packet data along with other packet information for relayer to pick up and relay to other chain

func EmitTimeoutPacketEvent 

func EmitTimeoutPacketEvent(ctx sdk.Context, packet exported.PacketI, channel types.Channel)

EmitTimeoutPacketEvent emits a timeout packet event. It will be emitted both the first time a packet is timed out for a certain sequence and for all duplicate timeouts.

func EmitWriteAcknowledgementEvent 

func EmitWriteAcknowledgementEvent(ctx sdk.Context, packet exported.PacketI, channel types.Channel, acknowledgement []byte)

EmitWriteAcknowledgementEvent emits an event that the relayer can query for

Types

type Keeper 

type Keeper struct {
	// implements gRPC QueryServer interface
	types.QueryServer
	// contains filtered or unexported fields
}

Keeper defines the IBC channel keeper

func NewKeeper 

func NewKeeper(
	cdc codec.BinaryCodec, key sdk.StoreKey,
	clientKeeper types.ClientKeeper, connectionKeeper types.ConnectionKeeper,
	portKeeper types.PortKeeper, scopedKeeper capabilitykeeper.ScopedKeeper,
) Keeper

NewKeeper creates a new IBC channel Keeper instance

func (Keeper) AcknowledgePacket 

func (k Keeper) AcknowledgePacket(
	ctx sdk.Context,
	chanCap *capabilitytypes.Capability,
	packet exported.PacketI,
	acknowledgement []byte,
	proof []byte,
	proofHeight exported.Height,
) error

AcknowledgePacket is called by a module to process the acknowledgement of a packet previously sent by the calling module on a channel to a counterparty module on the counterparty chain. Its intended usage is within the ante handler. AcknowledgePacket will clean up the packet commitment, which is no longer necessary since the packet has been received and acted upon. It will also increment NextSequenceAck in case of ORDERED channels.

func (Keeper) ChanCloseConfirm 

func (k Keeper) ChanCloseConfirm(
	ctx sdk.Context,
	portID,
	channelID string,
	chanCap *capabilitytypes.Capability,
	proofInit []byte,
	proofHeight exported.Height,
) error

ChanCloseConfirm is called by the counterparty module to close their end of the channel, since the other end has been closed.

func (Keeper) ChanCloseInit 

func (k Keeper) ChanCloseInit(
	ctx sdk.Context,
	portID,
	channelID string,
	chanCap *capabilitytypes.Capability,
) error

Closing Handshake

This section defines the set of functions required to close a channel handshake as defined in https://github.com/cosmos/ibc/tree/master/spec/core/ics-004-channel-and-packet-semantics#closing-handshake

ChanCloseInit is called by either module to close their end of the channel. Once closed, channels cannot be reopened.

func (Keeper) ChanOpenAck 

func (k Keeper) ChanOpenAck(
	ctx sdk.Context,
	portID,
	channelID string,
	chanCap *capabilitytypes.Capability,
	counterpartyVersion,
	counterpartyChannelID string,
	proofTry []byte,
	proofHeight exported.Height,
) error

ChanOpenAck is called by the handshake-originating module to acknowledge the acceptance of the initial request by the counterparty module on the other chain.

func (Keeper) ChanOpenConfirm 

func (k Keeper) ChanOpenConfirm(
	ctx sdk.Context,
	portID,
	channelID string,
	chanCap *capabilitytypes.Capability,
	proofAck []byte,
	proofHeight exported.Height,
) error

ChanOpenConfirm is called by the counterparty module to close their end of the channel, since the other end has been closed.

func (Keeper) ChanOpenInit 

func (k Keeper) ChanOpenInit(
	ctx sdk.Context,
	order types.Order,
	connectionHops []string,
	portID string,
	portCap *capabilitytypes.Capability,
	counterparty types.Counterparty,
	version string,
) (string, *capabilitytypes.Capability, error)

ChanOpenInit is called by a module to initiate a channel opening handshake with a module on another chain. The counterparty channel identifier is validated to be empty in msg validation.

func (Keeper) ChanOpenTry 

func (k Keeper) ChanOpenTry(
	ctx sdk.Context,
	order types.Order,
	connectionHops []string,
	portID,
	previousChannelID string,
	portCap *capabilitytypes.Capability,
	counterparty types.Counterparty,
	counterpartyVersion string,
	proofInit []byte,
	proofHeight exported.Height,
) (string, *capabilitytypes.Capability, error)

ChanOpenTry is called by a module to accept the first step of a channel opening handshake initiated by a module on another chain.

func (Keeper) Channel 

func (q Keeper) Channel(c context.Context, req *types.QueryChannelRequest) (*types.QueryChannelResponse, error)

Channel implements the Query/Channel gRPC method

func (Keeper) ChannelClientState 

func (q Keeper) ChannelClientState(c context.Context, req *types.QueryChannelClientStateRequest) (*types.QueryChannelClientStateResponse, error)

ChannelClientState implements the Query/ChannelClientState gRPC method

func (Keeper) ChannelConsensusState 

func (q Keeper) ChannelConsensusState(c context.Context, req *types.QueryChannelConsensusStateRequest) (*types.QueryChannelConsensusStateResponse, error)

ChannelConsensusState implements the Query/ChannelConsensusState gRPC method

func (Keeper) Channels 

func (q Keeper) Channels(c context.Context, req *types.QueryChannelsRequest) (*types.QueryChannelsResponse, error)

Channels implements the Query/Channels gRPC method

func (Keeper) ConnectionChannels 

func (q Keeper) ConnectionChannels(c context.Context, req *types.QueryConnectionChannelsRequest) (*types.QueryConnectionChannelsResponse, error)

ConnectionChannels implements the Query/ConnectionChannels gRPC method

func (Keeper) GenerateChannelIdentifier 

func (k Keeper) GenerateChannelIdentifier(ctx sdk.Context) string

GenerateChannelIdentifier returns the next channel identifier.

func (Keeper) GetAllChannels 

func (k Keeper) GetAllChannels(ctx sdk.Context) (channels []types.IdentifiedChannel)

GetAllChannels returns all stored Channel objects.

func (Keeper) GetAllPacketAckSeqs 

func (k Keeper) GetAllPacketAckSeqs(ctx sdk.Context) (seqs []types.PacketSequence)

GetAllPacketAckSeqs returns all stored next acknowledgements sequences.

func (Keeper) GetAllPacketAcks 

func (k Keeper) GetAllPacketAcks(ctx sdk.Context) (acks []types.PacketState)

GetAllPacketAcks returns all stored PacketAcknowledgements objects.

func (Keeper) GetAllPacketCommitments 

func (k Keeper) GetAllPacketCommitments(ctx sdk.Context) (commitments []types.PacketState)

GetAllPacketCommitments returns all stored PacketCommitments objects.

func (Keeper) GetAllPacketCommitmentsAtChannel 

func (k Keeper) GetAllPacketCommitmentsAtChannel(ctx sdk.Context, portID, channelID string) (commitments []types.PacketState)

GetAllPacketCommitmentsAtChannel returns all stored PacketCommitments objects for a specified port ID and channel ID.

func (Keeper) GetAllPacketReceipts 

func (k Keeper) GetAllPacketReceipts(ctx sdk.Context) (receipts []types.PacketState)

GetAllPacketReceipts returns all stored PacketReceipt objects.

func (Keeper) GetAllPacketRecvSeqs 

func (k Keeper) GetAllPacketRecvSeqs(ctx sdk.Context) (seqs []types.PacketSequence)

GetAllPacketRecvSeqs returns all stored next recv sequences.

func (Keeper) GetAllPacketSendSeqs 

func (k Keeper) GetAllPacketSendSeqs(ctx sdk.Context) (seqs []types.PacketSequence)

GetAllPacketSendSeqs returns all stored next send sequences.

func (Keeper) GetChannel 

func (k Keeper) GetChannel(ctx sdk.Context, portID, channelID string) (types.Channel, bool)

GetChannel returns a channel with a particular identifier binded to a specific port

func (Keeper) GetChannelClientState 

func (k Keeper) GetChannelClientState(ctx sdk.Context, portID, channelID string) (string, exported.ClientState, error)

GetChannelClientState returns the associated client state with its ID, from a port and channel identifier.

func (Keeper) GetChannelConnection 

func (k Keeper) GetChannelConnection(ctx sdk.Context, portID, channelID string) (string, exported.ConnectionI, error)

GetChannelConnection returns the connection ID and state associated with the given port and channel identifier.

func (Keeper) GetConnection 

func (k Keeper) GetConnection(ctx sdk.Context, connectionID string) (exported.ConnectionI, error)

GetConnection wraps the connection keeper's GetConnection function.

func (Keeper) GetNextChannelSequence 

func (k Keeper) GetNextChannelSequence(ctx sdk.Context) uint64

GetNextChannelSequence gets the next channel sequence from the store.

func (Keeper) GetNextSequenceAck 

func (k Keeper) GetNextSequenceAck(ctx sdk.Context, portID, channelID string) (uint64, bool)

GetNextSequenceAck gets a channel's next ack sequence from the store

func (Keeper) GetNextSequenceRecv 

func (k Keeper) GetNextSequenceRecv(ctx sdk.Context, portID, channelID string) (uint64, bool)

GetNextSequenceRecv gets a channel's next receive sequence from the store

func (Keeper) GetNextSequenceSend 

func (k Keeper) GetNextSequenceSend(ctx sdk.Context, portID, channelID string) (uint64, bool)

GetNextSequenceSend gets a channel's next send sequence from the store

func (Keeper) GetPacketAcknowledgement 

func (k Keeper) GetPacketAcknowledgement(ctx sdk.Context, portID, channelID string, sequence uint64) ([]byte, bool)

GetPacketAcknowledgement gets the packet ack hash from the store

func (Keeper) GetPacketCommitment 

func (k Keeper) GetPacketCommitment(ctx sdk.Context, portID, channelID string, sequence uint64) []byte

GetPacketCommitment gets the packet commitment hash from the store

func (Keeper) GetPacketReceipt 

func (k Keeper) GetPacketReceipt(ctx sdk.Context, portID, channelID string, sequence uint64) (string, bool)

GetPacketReceipt gets a packet receipt from the store

func (Keeper) HasPacketAcknowledgement 

func (k Keeper) HasPacketAcknowledgement(ctx sdk.Context, portID, channelID string, sequence uint64) bool

HasPacketAcknowledgement check if the packet ack hash is already on the store

func (Keeper) HasPacketCommitment 

func (k Keeper) HasPacketCommitment(ctx sdk.Context, portID, channelID string, sequence uint64) bool

HasPacketCommitment returns true if the packet commitment exists

func (Keeper) IterateChannels 

func (k Keeper) IterateChannels(ctx sdk.Context, cb func(types.IdentifiedChannel) bool)

IterateChannels provides an iterator over all Channel objects. For each Channel, cb will be called. If the cb returns true, the iterator will close and stop.

func (Keeper) IteratePacketAcknowledgement 

func (k Keeper) IteratePacketAcknowledgement(ctx sdk.Context, cb func(portID, channelID string, sequence uint64, hash []byte) bool)

IteratePacketAcknowledgement provides an iterator over all PacketAcknowledgement objects. For each aknowledgement, cb will be called. If the cb returns true, the iterator will close and stop.

func (Keeper) IteratePacketCommitment 

func (k Keeper) IteratePacketCommitment(ctx sdk.Context, cb func(portID, channelID string, sequence uint64, hash []byte) bool)

IteratePacketCommitment provides an iterator over all PacketCommitment objects. For each packet commitment, cb will be called. If the cb returns true, the iterator will close and stop.

func (Keeper) IteratePacketCommitmentAtChannel 

func (k Keeper) IteratePacketCommitmentAtChannel(ctx sdk.Context, portID, channelID string, cb func(_, _ string, sequence uint64, hash []byte) bool)

IteratePacketCommitmentAtChannel provides an iterator over all PacketCommmitment objects at a specified channel. For each packet commitment, cb will be called. If the cb returns true, the iterator will close and stop.

func (Keeper) IteratePacketReceipt 

func (k Keeper) IteratePacketReceipt(ctx sdk.Context, cb func(portID, channelID string, sequence uint64, receipt []byte) bool)

IteratePacketReceipt provides an iterator over all PacketReceipt objects. For each receipt, cb will be called. If the cb returns true, the iterator will close and stop.

func (Keeper) IteratePacketSequence 

func (k Keeper) IteratePacketSequence(ctx sdk.Context, iterator db.Iterator, cb func(portID, channelID string, sequence uint64) bool)

IteratePacketSequence provides an iterator over all send, receive or ack sequences. For each sequence, cb will be called. If the cb returns true, the iterator will close and stop.

func (Keeper) Logger 

func (k Keeper) Logger(ctx sdk.Context) log.Logger

Logger returns a module-specific logger.

func (Keeper) LookupModuleByChannel 

func (k Keeper) LookupModuleByChannel(ctx sdk.Context, portID, channelID string) (string, *capabilitytypes.Capability, error)

LookupModuleByChannel will return the IBCModule along with the capability associated with a given channel defined by its portID and channelID

func (Keeper) NextSequenceReceive 

func (q Keeper) NextSequenceReceive(c context.Context, req *types.QueryNextSequenceReceiveRequest) (*types.QueryNextSequenceReceiveResponse, error)

NextSequenceReceive implements the Query/NextSequenceReceive gRPC method

func (Keeper) PacketAcknowledgement 

func (q Keeper) PacketAcknowledgement(c context.Context, req *types.QueryPacketAcknowledgementRequest) (*types.QueryPacketAcknowledgementResponse, error)

PacketAcknowledgement implements the Query/PacketAcknowledgement gRPC method

func (Keeper) PacketAcknowledgements 

func (q Keeper) PacketAcknowledgements(c context.Context, req *types.QueryPacketAcknowledgementsRequest) (*types.QueryPacketAcknowledgementsResponse, error)

PacketAcknowledgements implements the Query/PacketAcknowledgements gRPC method

func (Keeper) PacketCommitment 

func (q Keeper) PacketCommitment(c context.Context, req *types.QueryPacketCommitmentRequest) (*types.QueryPacketCommitmentResponse, error)

PacketCommitment implements the Query/PacketCommitment gRPC method

func (Keeper) PacketCommitments 

func (q Keeper) PacketCommitments(c context.Context, req *types.QueryPacketCommitmentsRequest) (*types.QueryPacketCommitmentsResponse, error)

PacketCommitments implements the Query/PacketCommitments gRPC method

func (Keeper) PacketReceipt 

func (q Keeper) PacketReceipt(c context.Context, req *types.QueryPacketReceiptRequest) (*types.QueryPacketReceiptResponse, error)

PacketReceipt implements the Query/PacketReceipt gRPC method

func (Keeper) RecvPacket 

func (k Keeper) RecvPacket(
	ctx sdk.Context,
	chanCap *capabilitytypes.Capability,
	packet exported.PacketI,
	proof []byte,
	proofHeight exported.Height,
) error

RecvPacket is called by a module in order to receive & process an IBC packet sent on the corresponding channel end on the counterparty chain.

func (Keeper) SendPacket 

func (k Keeper) SendPacket(
	ctx sdk.Context,
	channelCap *capabilitytypes.Capability,
	packet exported.PacketI,
) error

SendPacket is called by a module in order to send an IBC packet on a channel end owned by the calling module to the corresponding module on the counterparty chain.

func (Keeper) SetChannel 

func (k Keeper) SetChannel(ctx sdk.Context, portID, channelID string, channel types.Channel)

SetChannel sets a channel to the store

func (Keeper) SetNextChannelSequence 

func (k Keeper) SetNextChannelSequence(ctx sdk.Context, sequence uint64)

SetNextChannelSequence sets the next channel sequence to the store.

func (Keeper) SetNextSequenceAck 

func (k Keeper) SetNextSequenceAck(ctx sdk.Context, portID, channelID string, sequence uint64)

SetNextSequenceAck sets a channel's next ack sequence to the store

func (Keeper) SetNextSequenceRecv 

func (k Keeper) SetNextSequenceRecv(ctx sdk.Context, portID, channelID string, sequence uint64)

SetNextSequenceRecv sets a channel's next receive sequence to the store

func (Keeper) SetNextSequenceSend 

func (k Keeper) SetNextSequenceSend(ctx sdk.Context, portID, channelID string, sequence uint64)

SetNextSequenceSend sets a channel's next send sequence to the store

func (Keeper) SetPacketAcknowledgement 

func (k Keeper) SetPacketAcknowledgement(ctx sdk.Context, portID, channelID string, sequence uint64, ackHash []byte)

SetPacketAcknowledgement sets the packet ack hash to the store

func (Keeper) SetPacketCommitment 

func (k Keeper) SetPacketCommitment(ctx sdk.Context, portID, channelID string, sequence uint64, commitmentHash []byte)

SetPacketCommitment sets the packet commitment hash to the store

func (Keeper) SetPacketReceipt 

func (k Keeper) SetPacketReceipt(ctx sdk.Context, portID, channelID string, sequence uint64)

SetPacketReceipt sets an empty packet receipt to the store

func (Keeper) TimeoutExecuted 

func (k Keeper) TimeoutExecuted(
	ctx sdk.Context,
	chanCap *capabilitytypes.Capability,
	packet exported.PacketI,
) error

TimeoutExecuted deletes the commitment send from this chain after it verifies timeout. If the timed-out packet came from an ORDERED channel then this channel will be closed.

CONTRACT: this function must be called in the IBC handler

func (Keeper) TimeoutOnClose 

func (k Keeper) TimeoutOnClose(
	ctx sdk.Context,
	chanCap *capabilitytypes.Capability,
	packet exported.PacketI,
	proof,
	proofClosed []byte,
	proofHeight exported.Height,
	nextSequenceRecv uint64,
) error

TimeoutOnClose is called by a module in order to prove that the channel to which an unreceived packet was addressed has been closed, so the packet will never be received (even if the timeoutHeight has not yet been reached).

func (Keeper) TimeoutPacket 

func (k Keeper) TimeoutPacket(
	ctx sdk.Context,
	packet exported.PacketI,
	proof []byte,
	proofHeight exported.Height,
	nextSequenceRecv uint64,
) error

TimeoutPacket is called by a module which originally attempted to send a packet to a counterparty module, where the timeout height has passed on the counterparty chain without the packet being committed, to prove that the packet can no longer be executed and to allow the calling module to safely perform appropriate state transitions. Its intended usage is within the ante handler.

func (Keeper) UnreceivedAcks 

func (q Keeper) UnreceivedAcks(c context.Context, req *types.QueryUnreceivedAcksRequest) (*types.QueryUnreceivedAcksResponse, error)

UnreceivedAcks implements the Query/UnreceivedAcks gRPC method. Given a list of counterparty packet acknowledgements, the querier checks if the packet has already been received by checking if the packet commitment still exists on this chain (original sender) for the packet sequence. All acknowledgmeents that haven't been received yet are returned in the response. Usage: To use this method correctly, first query all packet acknowledgements on the original receiving chain (ie the chain that wrote the acks) using the Query/PacketAcknowledgements gRPC method. Then input the returned sequences into the QueryUnreceivedAcksRequest and send the request to this Query/UnreceivedAcks on the **original sending** chain. This gRPC method will then return the list of packet sequences whose acknowledgements are already written on the receiving chain but haven't yet been received back to the sending chain.

NOTE: The querier makes the assumption that the provided list of packet acknowledgements is correct and will not function properly if the list is not up to date. Ideally the query height should equal the latest height on the counterparty's client which represents this chain.

func (Keeper) UnreceivedPackets 

func (q Keeper) UnreceivedPackets(c context.Context, req *types.QueryUnreceivedPacketsRequest) (*types.QueryUnreceivedPacketsResponse, error)

UnreceivedPackets implements the Query/UnreceivedPackets gRPC method. Given a list of counterparty packet commitments, the querier checks if the packet has already been received by checking if a receipt exists on this chain for the packet sequence. All packets that haven't been received yet are returned in the response Usage: To use this method correctly, first query all packet commitments on the sending chain using the Query/PacketCommitments gRPC method. Then input the returned sequences into the QueryUnreceivedPacketsRequest and send the request to this Query/UnreceivedPackets on the **receiving** chain. This gRPC method will then return the list of packet sequences that are yet to be received on the receiving chain.

NOTE: The querier makes the assumption that the provided list of packet commitments is correct and will not function properly if the list is not up to date. Ideally the query height should equal the latest height on the counterparty's client which represents this chain.

func (Keeper) WriteAcknowledgement 

func (k Keeper) WriteAcknowledgement(
	ctx sdk.Context,
	chanCap *capabilitytypes.Capability,
	packet exported.PacketI,
	acknowledgement exported.Acknowledgement,
) error

WriteAcknowledgement writes the packet execution acknowledgement to the state, which will be verified by the counterparty chain using AcknowledgePacket.

CONTRACT:

1) For synchronous execution, this function is be called in the IBC handler . For async handling, it needs to be called directly by the module which originally processed the packet.

2) Assumes that packet receipt has been written (unordered), or nextSeqRecv was incremented (ordered) previously by RecvPacket.

func (Keeper) WriteOpenAckChannel 

func (k Keeper) WriteOpenAckChannel(
	ctx sdk.Context,
	portID,
	channelID,
	counterpartyVersion,
	counterpartyChannelID string,
)

WriteOpenAckChannel writes an updated channel state for the successful OpenAck handshake step. An event is emitted for the handshake step.

func (Keeper) WriteOpenConfirmChannel 

func (k Keeper) WriteOpenConfirmChannel(
	ctx sdk.Context,
	portID,
	channelID string,
)

WriteOpenConfirmChannel writes an updated channel state for the successful OpenConfirm handshake step. An event is emitted for the handshake step.

func (Keeper) WriteOpenInitChannel 

func (k Keeper) WriteOpenInitChannel(
	ctx sdk.Context,
	portID,
	channelID string,
	order types.Order,
	connectionHops []string,
	counterparty types.Counterparty,
	version string,
)

WriteOpenInitChannel writes a channel which has successfully passed the OpenInit handshake step. The channel is set in state and all the associated Send and Recv sequences are set to 1. An event is emitted for the handshake step.

func (Keeper) WriteOpenTryChannel 

func (k Keeper) WriteOpenTryChannel(
	ctx sdk.Context,
	portID,
	channelID string,
	order types.Order,
	connectionHops []string,
	counterparty types.Counterparty,
	version string,
)

WriteOpenTryChannel writes a channel which has successfully passed the OpenTry handshake step. The channel is set in state. If a previous channel state did not exist, all the Send and Recv sequences are set to 1. An event is emitted for the handshake step.

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