txfees

package
v20.0.0 Latest Latest
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 Go to latest Published: Oct 16, 2023 License: Apache-2.0 Imports: 18 Imported by: 2

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. Two new module accounts are created in this module; one is the fee collector for staking rewards and the other is the fee collector for the community pool. The primary fee collector that this module sends funds to is the fee collector initialized in the sdk's authtypes module, which automatically sends funds to stakers after each epoch. See the Epoch Hooks section below for more details.

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.

Epoch Hooks

The txfees module includes hooks that trigger actions at the end of each epoch.

The AfterEpochEnd hook performs several actions:

  1. It swaps all non-OSMO denominated fees in the non-native fee collector for staking rewards module account into OSMO. This is done by checking the balance of the non-native fee collector for staking rewards module account, and swapping each non-OSMO denominated fee into OSMO. If a pool does not exist for a particular denomination pair, the swap is silently skipped. See the swapNonNativeFeeToDenom function description below for more details.

  2. After the swap, it transfers all OSMO from the non-native fee collector for staking rewards to the primary txfees fee collector module account. This indirectly distributes the fees to stakers.

  3. It also swaps non-whitelisted assets in the non-native community pool collector into the denomination specified in the pool manager parameters (currently USDC).

  4. Finally, it funds the community pool with the swapped denomination.

The swapNonNativeFeeToDenom function is used to perform the swaps. It iterates over each coin in the balance of the specified fee collector account, and swaps it into the specified denomination. This function assumes that a pool route exists in the protorev route store for each denomination pair. If a pool route does not exist or is disabled, the swap is silently skipped.

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
    • 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.

Queries

base-denom

  • Query the base fee denom

denom-pool-id

  • Query the pool id associated with a specific whitelisted fee token

fee-tokens

  • Query the list of non-basedenom fee tokens and their associated pool ids

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

Overview

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.

- 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. - Adds a new SDK message for creating governance proposals for adding new TxFee denoms.

Index

Constants

View Source 
const ModuleName = types.ModuleName

Variables

This section is empty.

Functions

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(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) 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) QuerierRoute 

func (AppModule) QuerierRoute() string

QuerierRoute returns the txfees module's query routing key.

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) Route 

func (am AppModule) Route() sdk.Route

Route returns the txfees module's message routing key.

type AppModuleBasic 

type AppModuleBasic struct{}

AppModuleBasic implements the AppModuleBasic interface for the txfees module.

func NewAppModuleBasic 

func NewAppModuleBasic() 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
cli
rest
txfee_filters
Package types is a reverse proxy.
 Package types is a reverse proxy.

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