icacallbacks

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 Go to latest Published: Apr 7, 2023 License: Apache-2.0 Imports: 28 Imported by: 0

README

title: "Icacallbacks" excerpt: "" category: 6392913957c533007128548e

The ICACallbacks Module

Add icacallbacks module. Interchain accounts are very useful, but ICA calls triggered by automated logic on Stride are limited in functionality and difficult to work with due to a lack of callbacks. Most of Stride's interchain account logic is triggered epochly from the BeginBlocker, and state updates on Stride must be made after ICA calls are issued, based on the success / failure of those calls.

The challenges faced before creating the icacallbacks modules were: (1) Messages must be handled one-off (by matching on message type) - really what we want to do is update state in acks based on the transaction sent (2) Message responses are almost always empty, e.g. MsgDelegateResponse, which leads to (3) Matching processed messages to state on the controller is very challenging (sometimes impossible) based on the attributes of the message sent. For example, given the following type

type Gift struct {
    from string
    to string
    amount int
    reason string
}

two ICA bank sends associated with gifts that have the same from, to and amount but different reasons are indistinguishable today in acks.

icacontroller solves the issues as follows

  • Callbacks can be registered to process data associated with a particular IBC packet, per module (solves 1)
  • ICA auth modules can store callback data using icacallbacks, passing in both a callback and args
  • Arguments to the callback can be (un)marshaled and contain arbitrary keys, allowing for updates to data on the controller chain based on the success / failure of the ICA call (solves 2 / 3)

Technical notes

  • Callbacks are uniquely identifiable through portId/channelId/sequence keys
  • Only modules that have registered callbacks can invoke them
  • icacallbacks doesn't have a message server / handler (it can only be called by other modules)
  • icacallbacks does authentication by fetching the module associated with a packet (containing the registered callbacks) by calling ChannelKeeper.LookupModuleByChannel (it's permissioned at the module level)
  • icacallbacks is an interchain account auth module, although it's possible this design could be generalized to work with other IBC modules
  • in case of a timeout, callbacks are still executed with the ack set to an empty byte array
  • We're using protos to serialize / deserialize callback arguments

The flow to add callbacks is to call ICACallbacksKeeper.SetCallbackData after sending an IBC transaction. When the ack returns

  • the callback is fetched using the callback key
  • the module is fetched using the portId / channelId and the callback is invoked and deleted.

The middleware structure is as follows middleware

Invariants

  • portId, channelId pair map to a unique module (important for fetching the correct CallbackHandler from a received packet)
  • callback ids are unique within modules (they don't have to be unique between modules, because CallICACallback is scoped to a module)

Keeper functions

  • CallRegisteredICACallback(): invokes the relevant callback asssociated with an ICA

State

  • CallbackData: stores the callback type, arguments and associated packet
  • CallbackHandler
  • Callbacks
  • Callback

Events

The icacallbacks module does not currently emit any events.

Documentation

Index

Constants

This section is empty.

Variables

This section is empty.

Functions

func ExportGenesis 

func ExportGenesis(ctx sdk.Context, k keeper.Keeper) *types.GenesisState

ExportGenesis returns the capability module's exported genesis.

func InitGenesis 

func InitGenesis(ctx sdk.Context, k keeper.Keeper, genState types.GenesisState)

InitGenesis initializes the capability module's state from a provided genesis state.

func NewHandler 

func NewHandler(k keeper.Keeper) sdk.Handler

NewHandler ...

func ParseTxMsgData 

func ParseTxMsgData(acknowledgementResult []byte) ([][]byte, error)

Parses ICA tx responses and returns a list of each serialized response The format of the raw ack differs depending on which version of ibc-go is used For v4 and prior, the message responses are stored under the `Data` attribute of TxMsgData For v5 and later, the message responses are stored under the `MsgResponse` attribute of TxMsgdata

func UnpackAcknowledgementResponse 

func UnpackAcknowledgementResponse(ctx sdk.Context, logger log.Logger, ack []byte, isICA bool) (*types.AcknowledgementResponse, error)

UnpackAcknowledgementResponse unmarshals IBC Acknowledgements, determines the status of the acknowledgement (success or failure) 

and, if applicable, assembles the message responses

ICA transactions have associated messages responses. IBC transfer do not. With ICA transactions, the schema of the response differs depending on the version of ibc-go used, 

however, this function unifies the format into a common response (a slice of byte arrays)

Types

type AppModule 

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

AppModule implements the AppModule interface for the capability module.

func NewAppModule 

func NewAppModule(
	cdc codec.Codec,
	keeper keeper.Keeper,
	accountKeeper types.AccountKeeper,
	bankKeeper types.BankKeeper,
) AppModule

func (AppModule) BeginBlock 

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

BeginBlock executes all ABCI BeginBlock logic respective to the capability module.

func (AppModule) ConsensusVersion 

func (AppModule) ConsensusVersion() uint64

ConsensusVersion implements ConsensusVersion.

func (AppModule) EndBlock 

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

EndBlock executes all ABCI EndBlock logic respective to the capability module. It returns no validator updates.

func (AppModule) ExportGenesis 

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

ExportGenesis returns the capability module's exported genesis state as raw JSON bytes.

func (AppModule) GenerateGenesisState 

func (AppModule) GenerateGenesisState(simState *module.SimulationState)

GenerateGenesisState creates a randomized GenState of the module

func (AppModule) InitGenesis 

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

InitGenesis performs the capability module's genesis initialization It returns no validator updates.

func (AppModule) LegacyQuerierHandler 

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

LegacyQuerierHandler returns the capability module's Querier.

func (AppModule) Name 

func (am AppModule) Name() string

Name returns the capability module's name.

func (AppModule) ProposalContents 

func (AppModule) ProposalContents(_ module.SimulationState) []simtypes.WeightedProposalContent

ProposalContents doesn't return any content functions for governance proposals

func (AppModule) QuerierRoute 

func (AppModule) QuerierRoute() string

QuerierRoute returns the capability module's query routing key.

func (AppModule) RandomizedParams 

func (am AppModule) RandomizedParams(_ *rand.Rand) []simtypes.ParamChange

RandomizedParams creates randomized param changes for the simulator

func (AppModule) RegisterInvariants 

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

RegisterInvariants registers the capability module's invariants.

func (AppModule) RegisterServices 

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

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

func (AppModule) RegisterStoreDecoder 

func (am AppModule) RegisterStoreDecoder(_ sdk.StoreDecoderRegistry)

RegisterStoreDecoder registers a decoder

func (AppModule) Route 

func (am AppModule) Route() sdk.Route

Route returns the capability module's message routing key.

func (AppModule) WeightedOperations 

func (am AppModule) WeightedOperations(simState module.SimulationState) []simtypes.WeightedOperation

WeightedOperations returns the all the gov module operations with their respective weights.

type AppModuleBasic 

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

AppModuleBasic implements the AppModuleBasic interface for the capability module.

func NewAppModuleBasic 

func NewAppModuleBasic(cdc codec.BinaryCodec) AppModuleBasic

func (AppModuleBasic) DefaultGenesis 

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

DefaultGenesis returns the capability module's default genesis state.

func (AppModuleBasic) GetQueryCmd 

func (AppModuleBasic) GetQueryCmd() *cobra.Command

GetQueryCmd returns the capability module's root query command.

func (AppModuleBasic) GetTxCmd 

func (a AppModuleBasic) GetTxCmd() *cobra.Command

GetTxCmd returns the capability module's root tx command.

func (AppModuleBasic) Name 

func (AppModuleBasic) Name() string

Name returns the capability module's name.

func (AppModuleBasic) RegisterCodec 

func (AppModuleBasic) RegisterCodec(cdc *codec.LegacyAmino)

func (AppModuleBasic) RegisterGRPCGatewayRoutes 

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

RegisterGRPCGatewayRoutes registers the gRPC Gateway routes for the module.

func (AppModuleBasic) RegisterInterfaces 

func (a AppModuleBasic) RegisterInterfaces(reg cdctypes.InterfaceRegistry)

RegisterInterfaces registers the module's interface types

func (AppModuleBasic) RegisterLegacyAminoCodec 

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

func (AppModuleBasic) RegisterRESTRoutes 

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

RegisterRESTRoutes registers the capability module's REST service handlers.

func (AppModuleBasic) ValidateGenesis 

func (AppModuleBasic) ValidateGenesis(cdc codec.JSONCodec, config client.TxEncodingConfig, bz json.RawMessage) error

ValidateGenesis performs genesis state validation for the capability module.

Source Files

View all Source files

Directories

Path Synopsis
client
cli
migrations
v2
Package types is a reverse proxy.
 Package types is a reverse proxy.

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