txfees

package
v9.0.0 Latest Latest
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 Go to latest Published: Jun 1, 2022 License: Apache-2.0 Imports: 19 Imported by: 0

README

Txfees

The txfees modules allows nodes to easily support many tokens for usage as txfees, while letting node operators only specify their tx fee parameters for a single "base" asset. This is done by having this module maintain an allow-list of token denoms which can be used as tx fees, each with some associated metadata. Then this metadata is used in tandem with a "Spot Price Calculator" provided to the module, to convert the provided tx fees into their equivalent value in the base denomination. Currently the only supported metadata & spot price calculator is using a GAMM pool ID & the GAMM keeper.

State Changes

  • Adds a whitelist of tokens that can be used as fees on the chain.
    • Any token not on this list cannot be provided as a tx fee.
    • Any fee that is paid with a token that is on this list but is not the base denom will be collected in a separate module account to be batched and swapped into the base denom at the end of each epoch.
  • Adds a new SDK message for creating governance proposals for adding new TxFee denoms.

Local Mempool Filters Added

  • If you specify a min-tx-fee in the $BASEDENOM then
    • Your node will allow any tx w/ tx fee in the whitelist of fees, and a sufficient osmo-equivalent price to enter your mempool
      • Txs with valid non-basedenom tx fees will be routed to a separate module account. At the end of each epoch, these fees will be swapped into the basedenom token and transferred to the primary tx fee module account to be distributed to validators/delegators.
    • The osmo-equivalent price for determining sufficiency is rechecked after every block. (During the mempools RecheckTx)
      • TODO: further consider if we want to take this tradeoff. Allows someone who manipulates price for one block to flush txs using that asset as fee from most of the networks' mempools.
      • The simple alternative is only check fee equivalency at a txs entry into the mempool, which allows someone to manipulate price down to have many txs enter the chain at low cost.
      • Another alternative is to use TWAP instead of Spot Price once it is available on-chain
      • The former concern isn't very worrisome as long as some nodes have 0 min tx fees.
  • A separate min-gas-fee can be set on every node for arbitrage txs. Methods of detecting an arb tx atm
    • does start token of a swap = final token of swap (definitionally correct)
    • does it have multiple swap messages, with different tx ins. If so, we assume its an arb.
      • This has false positives, but is intended to avoid the obvious solution of splitting an arb into multiple messages.
    • We record all denoms seen across all swaps, and see if any duplicates. (TODO)
    • Contains both JoinPool and ExitPool messages in one tx.
      • Has some false positives.
    • These false positives seem like they primarily will get hit during batching of many distinct operations, not really in one atomic action.
  • A max wanted gas per any tx can be set to filter out attack txes.
  • If tx wanted gas > than predefined threshold of 1M, then separate 'min-gas-price-for-high-gas-tx' option used to calculate min gas price.

New SDK messages

TODO: Describe

CLI commands

TODO: Describe

Queries

TODO: Describe

Code structure

TODO: Describe

Future directions
  • Want to add in a system to add in general "tx fee credits" for different on-chain usages
    • e.g. making 0 fee txs under certain usecases
  • If other chains would like to use this, we should brainstorm mechanisms for extending the metadata proto fields

Documentation

Index

Constants

View Source 
const ModuleName = types.ModuleName

Variables

This section is empty.

Functions

func ExportGenesis 

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

ExportGenesis returns the txfees module's exported genesis.

func InitGenesis 

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

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

func NewUpdateFeeTokenProposalHandler 

func NewUpdateFeeTokenProposalHandler(k keeper.Keeper) govtypes.Handler

Types

type AppModule 

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

AppModule implements the AppModule interface for the txfees module.

func NewAppModule 

func NewAppModule(cdc codec.Codec, keeper keeper.Keeper) AppModule

func (AppModule) BeginBlock 

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

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

func (AppModule) ConsensusVersion 

func (AppModule) ConsensusVersion() uint64

ConsensusVersion implements AppModule/ConsensusVersion.

func (AppModule) EndBlock 

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

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

func (AppModule) ExportGenesis 

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

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

func (AppModule) GenerateGenesisState 

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

GenerateGenesisState creates a randomized GenState of the pool-incentives module.

func (AppModule) InitGenesis 

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

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

func (AppModule) LegacyQuerierHandler 

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

LegacyQuerierHandler is a no-op. Needed to meet AppModule interface.

func (AppModule) Name 

func (am AppModule) Name() string

Name returns the txfees module's name.

func (AppModule) ProposalContents 

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

ProposalContents doesn't return any content functions for governance proposals.

func (AppModule) QuerierRoute 

func (AppModule) QuerierRoute() string

QuerierRoute returns the txfees module's query routing key.

func (AppModule) RandomizedParams 

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

RandomizedParams creates randomized txfees param changes for the simulator.

func (AppModule) RegisterInvariants 

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

RegisterInvariants registers the txfees 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(sdr sdk.StoreDecoderRegistry)

RegisterStoreDecoder registers a decoder for supply module's types.

func (AppModule) Route 

func (am AppModule) Route() sdk.Route

Route returns the txfees 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 txfees module.

func NewAppModuleBasic 

func NewAppModuleBasic(cdc codec.Codec) AppModuleBasic

func (AppModuleBasic) DefaultGenesis 

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

DefaultGenesis returns the txfees module's default genesis state.

func (AppModuleBasic) GetQueryCmd 

func (AppModuleBasic) GetQueryCmd() *cobra.Command

GetQueryCmd returns the txfees module's root query command.

func (AppModuleBasic) GetTxCmd 

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

GetTxCmd returns the txfees module's root tx command.

func (AppModuleBasic) Name 

func (AppModuleBasic) Name() string

Name returns the txfees module's name.

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 is a no-op. Needed to meet AppModuleBasic interface.

func (AppModuleBasic) ValidateGenesis 

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

ValidateGenesis performs genesis state validation for the txfee module.

Source Files

View all Source files

Directories

Path Synopsis
client
cli
txfee_filters
Package types is a reverse proxy.
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