ibchooks

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 Go to latest Published: Apr 4, 2023 License: Apache-2.0 Imports: 21 Imported by: 0

README

IBC-hooks

Taken from osmosis v14.0.0-rc1 (commit 26e2fad8e7b3eb7c33965360b31a593b392d7d75)

Removed ibc_callback functionality since we already have similar sudo callback mechanism in Transfer module.

Module https://github.com/osmosis-labs/osmosis/tree/v14.0.0-rc1/x/ibc-hooks

Wasm Hooks

The wasm hook is an IBC middleware which is used to allow ICS-20 token transfers to initiate contract calls. This allows cross-chain contract calls, that involve token movement. This is useful for a variety of usecases. One of primary importance is cross-chain swaps, which is an extremely powerful primitive.

The mechanism enabling this is a memo field on every ICS20 transfer packet as of IBC v3.4.0. Wasm hooks is an IBC middleware that parses an ICS20 transfer, and if the memo field is of a particular form, executes a wasm contract call. We now detail the memo format for wasm contract calls, and the execution guarantees provided.

Cosmwasm Contract Execution Format

Before we dive into the IBC metadata format, we show the cosmwasm execute message format, so the reader has a sense of what are the fields we need to be setting in. The cosmwasm MsgExecuteContract is defined here as the following type:

type MsgExecuteContract struct {
// Sender is the that actor that signed the messages
Sender string
// Contract is the address of the smart contract
Contract string
// Msg json encoded message to be passed to the contract
Msg RawContractMessage
// Funds coins that are transferred to the contract on execution
Funds sdk.Coins
}

So we detail where we want to get each of these fields from:

  • Sender: We cannot trust the sender of an IBC packet, the counterparty chain has full ability to lie about it. We cannot risk this sender being confused for a particular user or module address on Neutron. So we replace the sender with an account to represent the sender prefixed by the channel and a wasm module prefix. This is done by setting the sender to Bech32(Hash("ibc-wasm-hook-intermediaryg" || channelID || sender)), where the channelId is the channel id on the local chain.
  • Contract: This field should be directly obtained from the ICS-20 packet metadata
  • Msg: This field should be directly obtained from the ICS-20 packet metadata.
  • Funds: This field is set to the amount of funds being sent over in the ICS 20 packet. One detail is that the denom in the packet is the counterparty chains representation of the denom, so we have to translate it to Neutron' representation.

So our constructed cosmwasm message that we execute will look like:

msg := MsgExecuteContract{
	// Sender is the that actor that signed the messages
	Sender: "ntrn-hash-of-channel-and-sender",
	// Contract is the address of the smart contract
	Contract: packet.data.memo["wasm"]["ContractAddress"],
	// Msg json encoded message to be passed to the contract
	Msg: packet.data.memo["wasm"]["Msg"],
	// Funds coins that are transferred to the contract on execution
	Funds: sdk.NewCoin{Denom: ibc.ConvertSenderDenomToLocalDenom(packet.data.Denom), Amount: packet.data.Amount}
}
ICS20 packet structure

So given the details above, we propagate the implied ICS20 packet data structure. ICS20 is JSON native, so we use JSON for the memo format.

{
    //... other ibc fields that we don't care about
    "data":{
    	"denom": "denom on counterparty chain (e.g. uatom)",  // will be transformed to the local denom (ibc/...)
        "amount": "1000",
        "sender": "addr on counterparty chain", // will be transformed
        "receiver": "contract addr or blank",
    	"memo": {
           "wasm": {
              "contract": "ntrnContractAddr",
              "msg": {
                "raw_message_fields": "raw_message_data",
              }
            }
        }
    }
}

An ICS20 packet is formatted correctly for wasmhooks iff the following all hold:

  • memo is not blank
  • memo is valid JSON
  • memo has at least one key, with value "wasm"
  • memo["wasm"] has exactly two entries, "contract" and "msg"
  • memo["wasm"]["msg"] is a valid JSON object
  • receiver == "" || receiver == memo["wasm"]["contract"]

We consider an ICS20 packet as directed towards wasmhooks iff all of the following hold:

  • memo is not blank
  • memo is valid JSON
  • memo has at least one key, with name "wasm"

If an ICS20 packet is not directed towards wasmhooks, wasmhooks doesn't do anything. If an ICS20 packet is directed towards wasmhooks, and is formatted incorrectly, then wasmhooks returns an error.

Execution flow

Pre wasm hooks:

  • Ensure the incoming IBC packet is cryptographically valid
  • Ensure the incoming IBC packet is not timed out.

In Wasm hooks, pre packet execution:

  • Ensure the packet is correctly formatted (as defined above)
  • Edit the receiver to be the hardcoded IBC module account

In wasm hooks, post packet execution:

  • Construct wasm message as defined before
  • Execute wasm message
  • if wasm message has error, return ErrAck
  • otherwise continue through middleware

Testing strategy

See go tests.

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

This section is empty.

Types

type AppModule 

type AppModule struct {
	AppModuleBasic
	// contains filtered or unexported fields
}

AppModule implements an application module for the ibc-hooks module.

func NewAppModule 

func NewAppModule(ak types.AccountKeeper) AppModule

NewAppModule creates a new AppModule object.

func (AppModule) BeginBlock 

func (am AppModule) BeginBlock(_ sdk.Context, _ abci.RequestBeginBlock)

BeginBlock returns the begin blocker for the ibc-hooks module.

func (AppModule) ConsensusVersion 

func (AppModule) ConsensusVersion() uint64

ConsensusVersion implements AppModule/ConsensusVersion.

func (AppModule) EndBlock 

func (AppModule) EndBlock(_ sdk.Context, _ abci.RequestEndBlock) []abci.ValidatorUpdate

EndBlock returns the end blocker for the ibc-hooks module. It returns no validator updates.

func (AppModule) ExportGenesis 

func (am AppModule) ExportGenesis(_ sdk.Context, _ codec.JSONCodec) json.RawMessage

func (AppModule) InitGenesis 

func (am AppModule) InitGenesis(_ sdk.Context, _ codec.JSONCodec, _ json.RawMessage) []abci.ValidatorUpdate

InitGenesis performs genesis initialization for the ibc-hooks module. It returns no validator updates.

func (AppModule) LegacyQuerierHandler 

func (am AppModule) LegacyQuerierHandler(_ *codec.LegacyAmino) sdk.Querier

LegacyQuerierHandler returns the x/ibc-hooks module's sdk.Querier.

func (AppModule) Name 

func (AppModule) Name() string

Name returns the ibc-hooks module's name.

func (AppModule) QuerierRoute 

func (AppModule) QuerierRoute() string

QuerierRoute returns the module's querier route name.

func (AppModule) RegisterInvariants 

func (am AppModule) RegisterInvariants(_ sdk.InvariantRegistry)

RegisterInvariants registers the ibc-hooks module invariants.

func (AppModule) RegisterServices 

func (am AppModule) RegisterServices(_ module.Configurator)

RegisterServices registers a gRPC query service to respond to the module-specific gRPC queries.

func (AppModule) Route 

func (AppModule) Route() sdk.Route

Route returns the message routing key for the ibc-hooks module.

type AppModuleBasic 

type AppModuleBasic struct{}

AppModuleBasic defines the basic application module used by the ibc-hooks module.

func (AppModuleBasic) DefaultGenesis 

func (AppModuleBasic) DefaultGenesis(_ codec.JSONCodec) json.RawMessage

DefaultGenesis returns default genesis state as raw bytes for the module.

func (AppModuleBasic) GetQueryCmd 

func (AppModuleBasic) GetQueryCmd() *cobra.Command

GetQueryCmd returns the root query command for the ibc-hooks module.

func (AppModuleBasic) GetTxCmd 

func (AppModuleBasic) GetTxCmd() *cobra.Command

GetTxCmd returns no root tx command for the ibc-hooks module.

func (AppModuleBasic) Name 

func (AppModuleBasic) Name() string

Name returns the ibc-hooks module's name.

func (AppModuleBasic) RegisterGRPCGatewayRoutes 

func (AppModuleBasic) RegisterGRPCGatewayRoutes(_ client.Context, _ *runtime.ServeMux)

RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for the ibc-hooks module.

func (AppModuleBasic) RegisterInterfaces 

func (b AppModuleBasic) RegisterInterfaces(_ cdctypes.InterfaceRegistry)

RegisterInterfaces registers the module's interface types.

func (AppModuleBasic) RegisterLegacyAminoCodec 

func (AppModuleBasic) RegisterLegacyAminoCodec(_ *codec.LegacyAmino)

RegisterLegacyAminoCodec registers the ibc-hooks module's types on the given LegacyAmino codec.

func (AppModuleBasic) RegisterRESTRoutes 

func (AppModuleBasic) RegisterRESTRoutes(_ client.Context, _ *mux.Router)

RegisterRESTRoutes registers the REST routes for the ibc-hooks module.

func (AppModuleBasic) ValidateGenesis 

func (AppModuleBasic) ValidateGenesis(_ codec.JSONCodec, _ client.TxEncodingConfig, _ json.RawMessage) error

ValidateGenesis performs genesis state validation for the ibc-hooks module.

type ContractAck 

type ContractAck struct {
	ContractResult []byte `json:"contract_result"`
	IbcAck         []byte `json:"ibc_ack"`
}

type GetAppVersionAfterHooks 

type GetAppVersionAfterHooks interface {
	GetAppVersionAfterHook(ctx sdk.Context, portID, channelID string, result string, success bool)
}

type GetAppVersionBeforeHooks 

type GetAppVersionBeforeHooks interface {
	GetAppVersionBeforeHook(ctx sdk.Context, portID, channelID string)
}

type GetAppVersionOverrideHooks 

type GetAppVersionOverrideHooks interface {
	GetAppVersionOverride(i ICS4Middleware, ctx sdk.Context, portID, channelID string) (string, bool)
}

GetAppVersion Hooks

type Hooks 

type Hooks interface{}

type IBCMiddleware 

type IBCMiddleware struct {
	App            porttypes.IBCModule
	ICS4Middleware *ICS4Middleware
}

func NewIBCMiddleware 

func NewIBCMiddleware(app porttypes.IBCModule, ics4 *ICS4Middleware) IBCMiddleware

func (IBCMiddleware) GetAppVersion 

func (im IBCMiddleware) GetAppVersion(ctx sdk.Context, portID, channelID string) (string, bool)

func (IBCMiddleware) OnAcknowledgementPacket 

func (im IBCMiddleware) OnAcknowledgementPacket(
	ctx sdk.Context,
	packet channeltypes.Packet,
	acknowledgement []byte,
	relayer sdk.AccAddress,
) error

OnAcknowledgementPacket implements the IBCMiddleware interface

func (IBCMiddleware) OnChanCloseConfirm 

func (im IBCMiddleware) OnChanCloseConfirm(
	ctx sdk.Context,
	portID,
	channelID string,
) error

OnChanCloseConfirm implements the IBCMiddleware interface

func (IBCMiddleware) OnChanCloseInit 

func (im IBCMiddleware) OnChanCloseInit(
	ctx sdk.Context,
	portID,
	channelID string,
) error

OnChanCloseInit implements the IBCMiddleware interface

func (IBCMiddleware) OnChanOpenAck 

func (im IBCMiddleware) OnChanOpenAck(
	ctx sdk.Context,
	portID,
	channelID string,
	counterpartyChannelID string,
	counterpartyVersion string,
) error

OnChanOpenAck implements the IBCMiddleware interface

func (IBCMiddleware) OnChanOpenConfirm 

func (im IBCMiddleware) OnChanOpenConfirm(
	ctx sdk.Context,
	portID,
	channelID string,
) error

OnChanOpenConfirm implements the IBCMiddleware interface

func (IBCMiddleware) OnChanOpenInit 

func (im IBCMiddleware) OnChanOpenInit(
	ctx sdk.Context,
	order channeltypes.Order,
	connectionHops []string,
	portID string,
	channelID string,
	channelCap *capabilitytypes.Capability,
	counterparty channeltypes.Counterparty,
	version string,
) (string, error)

OnChanOpenInit implements the IBCMiddleware interface

func (IBCMiddleware) OnChanOpenTry 

func (im IBCMiddleware) OnChanOpenTry(
	ctx sdk.Context,
	order channeltypes.Order,
	connectionHops []string,
	portID,
	channelID string,
	channelCap *capabilitytypes.Capability,
	counterparty channeltypes.Counterparty,
	counterpartyVersion string,
) (string, error)

OnChanOpenTry implements the IBCMiddleware interface

func (IBCMiddleware) OnRecvPacket 

func (im IBCMiddleware) OnRecvPacket(
	ctx sdk.Context,
	packet channeltypes.Packet,
	relayer sdk.AccAddress,
) ibcexported.Acknowledgement

OnRecvPacket implements the IBCMiddleware interface

func (IBCMiddleware) OnTimeoutPacket 

func (im IBCMiddleware) OnTimeoutPacket(
	ctx sdk.Context,
	packet channeltypes.Packet,
	relayer sdk.AccAddress,
) error

OnTimeoutPacket implements the IBCMiddleware interface

func (IBCMiddleware) SendPacket 

func (im IBCMiddleware) SendPacket(
	ctx sdk.Context,
	chanCap *capabilitytypes.Capability,
	packet ibcexported.PacketI,
) error

SendPacket implements the ICS4 Wrapper interface

func (IBCMiddleware) WriteAcknowledgement 

func (im IBCMiddleware) WriteAcknowledgement(
	ctx sdk.Context,
	chanCap *capabilitytypes.Capability,
	packet ibcexported.PacketI,
	ack ibcexported.Acknowledgement,
) error

WriteAcknowledgement implements the ICS4 Wrapper interface

type ICS4Middleware 

type ICS4Middleware struct {

	// Hooks
	Hooks Hooks
	// contains filtered or unexported fields
}

func NewICS4Middleware 

func NewICS4Middleware(channel porttypes.ICS4Wrapper, hooks Hooks) ICS4Middleware

func (ICS4Middleware) GetAppVersion 

func (i ICS4Middleware) GetAppVersion(ctx sdk.Context, portID, channelID string) (string, bool)

func (ICS4Middleware) SendPacket 

func (i ICS4Middleware) SendPacket(ctx sdk.Context, channelCap *capabilitytypes.Capability, packet ibcexported.PacketI) error

func (ICS4Middleware) WriteAcknowledgement 

func (i ICS4Middleware) WriteAcknowledgement(ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI, ack ibcexported.Acknowledgement) error

type OnAcknowledgementPacketAfterHooks 

type OnAcknowledgementPacketAfterHooks interface {
	OnAcknowledgementPacketAfterHook(ctx sdk.Context, packet channeltypes.Packet, acknowledgement []byte, relayer sdk.AccAddress, err error)
}

type OnAcknowledgementPacketBeforeHooks 

type OnAcknowledgementPacketBeforeHooks interface {
	OnAcknowledgementPacketBeforeHook(ctx sdk.Context, packet channeltypes.Packet, acknowledgement []byte, relayer sdk.AccAddress)
}

type OnAcknowledgementPacketOverrideHooks 

type OnAcknowledgementPacketOverrideHooks interface {
	OnAcknowledgementPacketOverride(im IBCMiddleware, ctx sdk.Context, packet channeltypes.Packet, acknowledgement []byte, relayer sdk.AccAddress) error
}

OnAcknowledgementPacket Hooks

type OnChanCloseConfirmAfterHooks 

type OnChanCloseConfirmAfterHooks interface {
	OnChanCloseConfirmAfterHook(ctx sdk.Context, portID, channelID string, err error)
}

type OnChanCloseConfirmBeforeHooks 

type OnChanCloseConfirmBeforeHooks interface {
	OnChanCloseConfirmBeforeHook(ctx sdk.Context, portID, channelID string)
}

type OnChanCloseConfirmOverrideHooks 

type OnChanCloseConfirmOverrideHooks interface {
	OnChanCloseConfirmOverride(im IBCMiddleware, ctx sdk.Context, portID, channelID string) error
}

OnChanCloseConfirm Hooks

type OnChanCloseInitAfterHooks 

type OnChanCloseInitAfterHooks interface {
	OnChanCloseInitAfterHook(ctx sdk.Context, portID, channelID string, err error)
}

type OnChanCloseInitBeforeHooks 

type OnChanCloseInitBeforeHooks interface {
	OnChanCloseInitBeforeHook(ctx sdk.Context, portID, channelID string)
}

type OnChanCloseInitOverrideHooks 

type OnChanCloseInitOverrideHooks interface {
	OnChanCloseInitOverride(im IBCMiddleware, ctx sdk.Context, portID, channelID string) error
}

OnChanCloseInit Hooks

type OnChanOpenAckAfterHooks 

type OnChanOpenAckAfterHooks interface {
	OnChanOpenAckAfterHook(ctx sdk.Context, portID, channelID string, counterpartyChannelID string, counterpartyVersion string, err error)
}

type OnChanOpenAckBeforeHooks 

type OnChanOpenAckBeforeHooks interface {
	OnChanOpenAckBeforeHook(ctx sdk.Context, portID, channelID string, counterpartyChannelID string, counterpartyVersion string)
}

type OnChanOpenAckOverrideHooks 

type OnChanOpenAckOverrideHooks interface {
	OnChanOpenAckOverride(im IBCMiddleware, ctx sdk.Context, portID, channelID string, counterpartyChannelID string, counterpartyVersion string) error
}

OnChanOpenAck Hooks

type OnChanOpenConfirmAfterHooks 

type OnChanOpenConfirmAfterHooks interface {
	OnChanOpenConfirmAfterHook(ctx sdk.Context, portID, channelID string, err error)
}

type OnChanOpenConfirmBeforeHooks 

type OnChanOpenConfirmBeforeHooks interface {
	OnChanOpenConfirmBeforeHook(ctx sdk.Context, portID, channelID string)
}

type OnChanOpenConfirmOverrideHooks 

type OnChanOpenConfirmOverrideHooks interface {
	OnChanOpenConfirmOverride(im IBCMiddleware, ctx sdk.Context, portID, channelID string) error
}

OnChanOpenConfirm Hooks

type OnChanOpenInitAfterHooks 

type OnChanOpenInitAfterHooks interface {
	OnChanOpenInitAfterHook(ctx sdk.Context, order channeltypes.Order, connectionHops []string, portID string, channelID string, channelCap *capabilitytypes.Capability, counterparty channeltypes.Counterparty, version string, finalVersion string, err error)
}

type OnChanOpenInitBeforeHooks 

type OnChanOpenInitBeforeHooks interface {
	OnChanOpenInitBeforeHook(ctx sdk.Context, order channeltypes.Order, connectionHops []string, portID string, channelID string, channelCap *capabilitytypes.Capability, counterparty channeltypes.Counterparty, version string)
}

type OnChanOpenInitOverrideHooks 

type OnChanOpenInitOverrideHooks interface {
	OnChanOpenInitOverride(im IBCMiddleware, ctx sdk.Context, order channeltypes.Order, connectionHops []string, portID string, channelID string, channelCap *capabilitytypes.Capability, counterparty channeltypes.Counterparty, version string) (string, error)
}

type OnChanOpenTryAfterHooks 

type OnChanOpenTryAfterHooks interface {
	OnChanOpenTryAfterHook(ctx sdk.Context, order channeltypes.Order, connectionHops []string, portID, channelID string, channelCap *capabilitytypes.Capability, counterparty channeltypes.Counterparty, counterpartyVersion string, version string, err error)
}

type OnChanOpenTryBeforeHooks 

type OnChanOpenTryBeforeHooks interface {
	OnChanOpenTryBeforeHook(ctx sdk.Context, order channeltypes.Order, connectionHops []string, portID, channelID string, channelCap *capabilitytypes.Capability, counterparty channeltypes.Counterparty, counterpartyVersion string)
}

type OnChanOpenTryOverrideHooks 

type OnChanOpenTryOverrideHooks interface {
	OnChanOpenTryOverride(im IBCMiddleware, ctx sdk.Context, order channeltypes.Order, connectionHops []string, portID, channelID string, channelCap *capabilitytypes.Capability, counterparty channeltypes.Counterparty, counterpartyVersion string) (string, error)
}

OnChanOpenTry Hooks

type OnRecvPacketAfterHooks 

type OnRecvPacketAfterHooks interface {
	OnRecvPacketAfterHook(ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress, ack ibcexported.Acknowledgement)
}

type OnRecvPacketBeforeHooks 

type OnRecvPacketBeforeHooks interface {
	OnRecvPacketBeforeHook(ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress)
}

type OnRecvPacketOverrideHooks 

type OnRecvPacketOverrideHooks interface {
	OnRecvPacketOverride(im IBCMiddleware, ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress) ibcexported.Acknowledgement
}

OnRecvPacket Hooks

type OnTimeoutPacketAfterHooks 

type OnTimeoutPacketAfterHooks interface {
	OnTimeoutPacketAfterHook(ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress, err error)
}

type OnTimeoutPacketBeforeHooks 

type OnTimeoutPacketBeforeHooks interface {
	OnTimeoutPacketBeforeHook(ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress)
}

type OnTimeoutPacketOverrideHooks 

type OnTimeoutPacketOverrideHooks interface {
	OnTimeoutPacketOverride(im IBCMiddleware, ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress) error
}

OnTimeoutPacket Hooks

type SendPacketAfterHooks 

type SendPacketAfterHooks interface {
	SendPacketAfterHook(ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI, err error)
}

type SendPacketBeforeHooks 

type SendPacketBeforeHooks interface {
	SendPacketBeforeHook(ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI)
}

type SendPacketOverrideHooks 

type SendPacketOverrideHooks interface {
	SendPacketOverride(i ICS4Middleware, ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI) error
}

SendPacket Hooks

type WasmHooks 

type WasmHooks struct {
	ContractKeeper *wasmkeeper.PermissionedKeeper
	// contains filtered or unexported fields
}

func NewWasmHooks 

func NewWasmHooks(contractKeeper *wasmkeeper.PermissionedKeeper, bech32PrefixAccAddr string) WasmHooks

func (WasmHooks) OnRecvPacketOverride 

func (h WasmHooks) OnRecvPacketOverride(im IBCMiddleware, ctx sdk.Context, packet channeltypes.Packet, relayer sdk.AccAddress) ibcexported.Acknowledgement

func (WasmHooks) ProperlyConfigured 

func (h WasmHooks) ProperlyConfigured() bool

type WriteAcknowledgementAfterHooks 

type WriteAcknowledgementAfterHooks interface {
	WriteAcknowledgementAfterHook(ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI, ack ibcexported.Acknowledgement, err error)
}

type WriteAcknowledgementBeforeHooks 

type WriteAcknowledgementBeforeHooks interface {
	WriteAcknowledgementBeforeHook(ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI, ack ibcexported.Acknowledgement)
}

type WriteAcknowledgementOverrideHooks 

type WriteAcknowledgementOverrideHooks interface {
	WriteAcknowledgementOverride(i ICS4Middleware, ctx sdk.Context, chanCap *capabilitytypes.Capability, packet ibcexported.PacketI, ack ibcexported.Acknowledgement) error
}

WriteAcknowledgement Hooks

Source Files

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Directories

Path Synopsis
client
cli

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