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relay.go
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relay.go
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package keeper
import (
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
capabilitytypes "github.com/cosmos/cosmos-sdk/x/capability/types"
icatypes "github.com/cosmos/ibc-go/v5/modules/apps/27-interchain-accounts/types"
clienttypes "github.com/cosmos/ibc-go/v5/modules/core/02-client/types"
channeltypes "github.com/cosmos/ibc-go/v5/modules/core/04-channel/types"
host "github.com/cosmos/ibc-go/v5/modules/core/24-host"
)
// SendTx takes pre-built packet data containing messages to be executed on the host chain from an authentication module and attempts to send the packet.
// The packet sequence for the outgoing packet is returned as a result.
// If the base application has the capability to send on the provided portID. An appropriate
// absolute timeoutTimestamp must be provided. If the packet is timed out, the channel will be closed.
// In the case of channel closure, a new channel may be reopened to reconnect to the host chain.
func (k Keeper) SendTx(ctx sdk.Context, _ *capabilitytypes.Capability, connectionID, portID string, icaPacketData icatypes.InterchainAccountPacketData, timeoutTimestamp uint64) (uint64, error) {
activeChannelID, found := k.GetOpenActiveChannel(ctx, connectionID, portID)
if !found {
return 0, sdkerrors.Wrapf(icatypes.ErrActiveChannelNotFound, "failed to retrieve active channel on connection %s for port %s", connectionID, portID)
}
sourceChannelEnd, found := k.channelKeeper.GetChannel(ctx, portID, activeChannelID)
if !found {
return 0, sdkerrors.Wrap(channeltypes.ErrChannelNotFound, activeChannelID)
}
destinationPort := sourceChannelEnd.GetCounterparty().GetPortID()
destinationChannel := sourceChannelEnd.GetCounterparty().GetChannelID()
chanCap, found := k.scopedKeeper.GetCapability(ctx, host.ChannelCapabilityPath(portID, activeChannelID))
if !found {
return 0, sdkerrors.Wrapf(capabilitytypes.ErrCapabilityNotFound, "failed to find capability: %s", host.ChannelCapabilityPath(portID, activeChannelID))
}
if uint64(ctx.BlockTime().UnixNano()) >= timeoutTimestamp {
return 0, icatypes.ErrInvalidTimeoutTimestamp
}
return k.createOutgoingPacket(ctx, portID, activeChannelID, destinationPort, destinationChannel, chanCap, icaPacketData, timeoutTimestamp)
}
func (k Keeper) createOutgoingPacket(
ctx sdk.Context,
sourcePort,
sourceChannel,
destinationPort,
destinationChannel string,
chanCap *capabilitytypes.Capability,
icaPacketData icatypes.InterchainAccountPacketData,
timeoutTimestamp uint64,
) (uint64, error) {
if err := icaPacketData.ValidateBasic(); err != nil {
return 0, sdkerrors.Wrap(err, "invalid interchain account packet data")
}
// get the next sequence
sequence, found := k.channelKeeper.GetNextSequenceSend(ctx, sourcePort, sourceChannel)
if !found {
return 0, sdkerrors.Wrapf(channeltypes.ErrSequenceSendNotFound, "failed to retrieve next sequence send for channel %s on port %s", sourceChannel, sourcePort)
}
packet := channeltypes.NewPacket(
icaPacketData.GetBytes(),
sequence,
sourcePort,
sourceChannel,
destinationPort,
destinationChannel,
clienttypes.ZeroHeight(),
timeoutTimestamp,
)
if err := k.ics4Wrapper.SendPacket(ctx, chanCap, packet); err != nil {
return 0, err
}
return packet.Sequence, nil
}
// OnTimeoutPacket removes the active channel associated with the provided packet, the underlying channel end is closed
// due to the semantics of ORDERED channels
func (k Keeper) OnTimeoutPacket(ctx sdk.Context, packet channeltypes.Packet) error {
return nil
}