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Published: Apr 8, 2022 License: Apache-2.0 Imports: 105 Imported by: 0


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simapp is an application built using the Cosmos SDK for testing and educational purposes.

Running testnets with simd

If you want to spin up a quick testnet with your friends, you can follow these steps. Unless otherwise noted, every step must be done by everyone who wants to participate in this testnet.

  1. From the root directory of the Cosmos SDK repository, run $ make build. This will build the simd binary inside a new build directory. The following instructions are run from inside the build directory.

  2. If you've run simd before, you may need to reset your database before starting a new testnet. You can reset your database with the following command: $ ./simd unsafe-reset-all.

  3. $ ./simd init [moniker] --chain-id [chain-id]. This will initialize a new working directory at the default location ~/.simapp. You need to provide a "moniker" and a "chain id". These two names can be anything, but you will need to use the same "chain id" in the following steps.

  4. $ ./simd keys add [key_name]. This will create a new key, with a name of your choosing. Save the output of this command somewhere; you'll need the address generated here later.

  5. $ ./simd add-genesis-account [key_name] [amount], where key_name is the same key name as before; and amount is something like 10000000000000000000000000stake.

  6. $ ./simd gentx [key_name] [amount] --chain-id [chain-id]. This will create the genesis transaction for your new chain. Here amount should be at least 1000000000stake. If you provide too much or too little, you will encounter an error when starting your node.

  7. Now, one person needs to create the genesis file genesis.json using the genesis transactions from every participant, by gathering all the genesis transactions under config/gentx and then calling $ ./simd collect-gentxs. This will create a new genesis.json file that includes data from all the validators (we sometimes call it the "super genesis file" to distinguish it from single-validator genesis files).

  8. Once you've received the super genesis file, overwrite your original genesis.json file with the new super genesis.json.

  9. Modify your config/config.toml (in the simapp working directory) to include the other participants as persistent peers:

    # Comma separated list of nodes to keep persistent connections to
    persistent_peers = "[validator_address]@[ip_address]:[port],[validator_address]@[ip_address]:[port]"

    You can find validator_address by running $ ./simd tendermint show-node-id. The output will be the hex-encoded validator_address. The default port is 26656.

  10. Now you can start your nodes: $ ./simd start.

Now you have a small testnet that you can use to try out changes to the Cosmos SDK or Tendermint!

NOTE: Sometimes creating the network through the collect-gentxs will fail, and validators will start in a funny state (and then panic). If this happens, you can try to create and start the network first with a single validator and then add additional validators using a create-validator transaction.




This section is empty.


View Source
var (
	// DefaultNodeHome default home directories for the application daemon
	DefaultNodeHome string

	// ModuleBasics defines the module BasicManager is in charge of setting up basic,
	// non-dependant module elements, such as codec registration
	// and genesis verification.
	ModuleBasics = module.NewBasicManager(
			paramsclient.ProposalHandler, distrclient.ProposalHandler, upgradeclient.ProposalHandler, upgradeclient.CancelProposalHandler,
View Source
var (
	FlagGenesisFileValue        string
	FlagParamsFileValue         string
	FlagExportParamsPathValue   string
	FlagExportParamsHeightValue int
	FlagExportStatePathValue    string
	FlagExportStatsPathValue    string
	FlagSeedValue               int64
	FlagInitialBlockHeightValue int
	FlagNumBlocksValue          int
	FlagBlockSizeValue          int
	FlagLeanValue               bool
	FlagCommitValue             bool
	FlagOnOperationValue        bool // TODO: Remove in favor of binary search for invariant violation
	FlagAllInvariantsValue      bool

	FlagEnabledValue     bool
	FlagVerboseValue     bool
	FlagPeriodValue      uint
	FlagGenesisTimeValue int64

List of available flags for the simulator

View Source
var DefaultConsensusParams = &abci.ConsensusParams{
	Block: &abci.BlockParams{
		MaxBytes: 200000,
		MaxGas:   2000000,
	Evidence: &tmproto.EvidenceParams{
		MaxAgeNumBlocks: 302400,
		MaxAgeDuration:  504 * time.Hour,
		MaxBytes:        10000,
	Validator: &tmproto.ValidatorParams{
		PubKeyTypes: []string{

DefaultConsensusParams defines the default Tendermint consensus params used in SimApp testing.


func AddTestAddrs

func AddTestAddrs(app *SimApp, ctx sdk.Context, accNum int, accAmt sdk.Int) []sdk.AccAddress

AddTestAddrs constructs and returns accNum amount of accounts with an initial balance of accAmt in random order

func AddTestAddrsFromPubKeys

func AddTestAddrsFromPubKeys(app *SimApp, ctx sdk.Context, pubKeys []cryptotypes.PubKey, accAmt sdk.Int)

AddTestAddrsFromPubKeys adds the addresses into the SimApp providing only the public keys.

func AddTestAddrsIncremental

func AddTestAddrsIncremental(app *SimApp, ctx sdk.Context, accNum int, accAmt sdk.Int) []sdk.AccAddress

AddTestAddrs constructs and returns accNum amount of accounts with an initial balance of accAmt in random order

func AppStateFn

func AppStateFn(cdc codec.JSONCodec, simManager *module.SimulationManager) simtypes.AppStateFn

AppStateFn returns the initial application state using a genesis or the simulation parameters. It panics if the user provides files for both of them. If a file is not given for the genesis or the sim params, it creates a randomized one.

func AppStateFromGenesisFileFn

func AppStateFromGenesisFileFn(r io.Reader, cdc codec.JSONCodec, genesisFile string) (tmtypes.GenesisDoc, []simtypes.Account)

AppStateFromGenesisFileFn util function to generate the genesis AppState from a genesis.json file.

func AppStateRandomizedFn

func AppStateRandomizedFn(
	simManager *module.SimulationManager, r *rand.Rand, cdc codec.JSONCodec,
	accs []simtypes.Account, genesisTimestamp time.Time, appParams simtypes.AppParams,
) (json.RawMessage, []simtypes.Account)

AppStateRandomizedFn creates calls each module's GenesisState generator function and creates the simulation params

func CheckBalance

func CheckBalance(t *testing.T, app *SimApp, addr sdk.AccAddress, balances sdk.Coins)

CheckBalance checks the balance of an account.

func CheckExportSimulation

func CheckExportSimulation(
	app App, config simtypes.Config, params simtypes.Params,
) error

CheckExportSimulation exports the app state and simulation parameters to JSON if the export paths are defined.

func ConvertAddrsToValAddrs

func ConvertAddrsToValAddrs(addrs []sdk.AccAddress) []sdk.ValAddress

ConvertAddrsToValAddrs converts the provided addresses to ValAddress.

func CreateTestPubKeys

func CreateTestPubKeys(numPubKeys int) []cryptotypes.PubKey

CreateTestPubKeys returns a total of numPubKeys public keys in ascending order.

func FundAccount

func FundAccount(bankKeeper bankkeeper.Keeper, ctx sdk.Context, addr sdk.AccAddress, amounts sdk.Coins) error

FundAccount is a utility function that funds an account by minting and sending the coins to the address. This should be used for testing purposes only!

TODO: Instead of using the mint module account, which has the permission of minting, create a "faucet" account. (@fdymylja)

func FundModuleAccount

func FundModuleAccount(bankKeeper bankkeeper.Keeper, ctx sdk.Context, recipientMod string, amounts sdk.Coins) error

FundModuleAccount is a utility function that funds a module account by minting and sending the coins to the address. This should be used for testing purposes only!

TODO: Instead of using the mint module account, which has the permission of minting, create a "faucet" account. (@fdymylja)

func GenSequenceOfTxs

func GenSequenceOfTxs(txGen client.TxConfig, msgs []sdk.Msg, accNums []uint64, initSeqNums []uint64, numToGenerate int, priv ...cryptotypes.PrivKey) ([]sdk.Tx, error)

GenSequenceOfTxs generates a set of signed transactions of messages, such that they differ only by having the sequence numbers incremented between every transaction.

func GetMaccPerms

func GetMaccPerms() map[string][]string

GetMaccPerms returns a copy of the module account permissions

func GetSimulationLog

func GetSimulationLog(storeName string, sdr sdk.StoreDecoderRegistry, kvAs, kvBs []kv.Pair) (log string)

GetSimulationLog unmarshals the KVPair's Value to the corresponding type based on the each's module store key and the prefix bytes of the KVPair's key.

func GetSimulatorFlags

func GetSimulatorFlags()

GetSimulatorFlags gets the values of all the available simulation flags

func MakeTestEncodingConfig

func MakeTestEncodingConfig() simappparams.EncodingConfig

MakeTestEncodingConfig creates an EncodingConfig for testing. This function should be used only in tests or when creating a new app instance (NewApp*()). App user shouldn't create new codecs - use the app.AppCodec instead. [DEPRECATED]

func NewConfigFromFlags

func NewConfigFromFlags() simulation.Config

NewConfigFromFlags creates a simulation from the retrieved values of the flags.

func NewPubKeyFromHex

func NewPubKeyFromHex(pk string) (res cryptotypes.PubKey)

NewPubKeyFromHex returns a PubKey from a hex string.

func PrintStats

func PrintStats(db dbm.DB)

PrintStats prints the corresponding statistics from the app DB.

func RegisterSwaggerAPI

func RegisterSwaggerAPI(ctx client.Context, rtr *mux.Router)

RegisterSwaggerAPI registers swagger route with API Server

func SetupSimulation

func SetupSimulation(dirPrefix, dbName string) (simtypes.Config, dbm.DB, string, log.Logger, bool, error)

SetupSimulation creates the config, db (levelDB), temporary directory and logger for the simulation tests. If `FlagEnabledValue` is false it skips the current test. Returns error on an invalid db intantiation or temp dir creation.

func SignCheckDeliver

func SignCheckDeliver(
	t *testing.T, txCfg client.TxConfig, app *bam.BaseApp, header tmproto.Header, msgs []sdk.Msg,
	chainID string, accNums, accSeqs []uint64, expSimPass, expPass bool, priv ...cryptotypes.PrivKey,
) (sdk.GasInfo, *sdk.Result, error)

SignCheckDeliver checks a generated signed transaction and simulates a block commitment with the given transaction. A test assertion is made using the parameter 'expPass' against the result. A corresponding result is returned.

func SimulationOperations

func SimulationOperations(app App, cdc codec.JSONCodec, config simtypes.Config) []simtypes.WeightedOperation

SimulationOperations retrieves the simulation params from the provided file path and returns all the modules weighted operations

func TestAddr

func TestAddr(addr string, bech string) (sdk.AccAddress, error)


type App

type App interface {
	// The assigned name of the app.
	Name() string

	// The application types codec.
	// NOTE: This shoult be sealed before being returned.
	LegacyAmino() *codec.LegacyAmino

	// Application updates every begin block.
	BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock) abci.ResponseBeginBlock

	// Application updates every end block.
	EndBlocker(ctx sdk.Context, req abci.RequestEndBlock) abci.ResponseEndBlock

	// Application update at chain (i.e app) initialization.
	InitChainer(ctx sdk.Context, req abci.RequestInitChain) abci.ResponseInitChain

	// Loads the app at a given height.
	LoadHeight(height int64) error

	// Exports the state of the application for a genesis file.
		forZeroHeight bool, jailAllowedAddrs []string,
	) (types.ExportedApp, error)

	// All the registered module account addreses.
	ModuleAccountAddrs() map[string]bool

	// Helper for the simulation framework.
	SimulationManager() *module.SimulationManager

App implements the common methods for a Cosmos SDK-based application specific blockchain.

type EmptyAppOptions

type EmptyAppOptions struct{}

EmptyAppOptions is a stub implementing AppOptions

func (EmptyAppOptions) Get

func (ao EmptyAppOptions) Get(o string) interface{}

Get implements AppOptions

type GenerateAccountStrategy

type GenerateAccountStrategy func(int) []sdk.AccAddress

type GenesisState

type GenesisState map[string]json.RawMessage

GenesisState of the blockchain is represented here as a map of raw json messages key'd by a identifier string. The identifier is used to determine which module genesis information belongs to so it may be appropriately routed during init chain. Within this application default genesis information is retrieved from the ModuleBasicManager which populates json from each BasicModule object provided to it during init.

func NewDefaultGenesisState

func NewDefaultGenesisState(cdc codec.JSONCodec) GenesisState

NewDefaultGenesisState generates the default state for the application.

type SimApp

type SimApp struct {

	// keepers
	AccountKeeper    authkeeper.AccountKeeper
	BankKeeper       bankkeeper.Keeper
	CapabilityKeeper *capabilitykeeper.Keeper
	StakingKeeper    stakingkeeper.Keeper
	SlashingKeeper   slashingkeeper.Keeper
	MintKeeper       mintkeeper.Keeper
	DistrKeeper      distrkeeper.Keeper
	GovKeeper        govkeeper.Keeper
	CrisisKeeper     crisiskeeper.Keeper
	UpgradeKeeper    upgradekeeper.Keeper
	ParamsKeeper     paramskeeper.Keeper
	AuthzKeeper      authzkeeper.Keeper
	EvidenceKeeper   evidencekeeper.Keeper
	FeeGrantKeeper   feegrantkeeper.Keeper
	// contains filtered or unexported fields

SimApp extends an ABCI application, but with most of its parameters exported. They are exported for convenience in creating helper functions, as object capabilities aren't needed for testing.

func NewSimApp

func NewSimApp(
	logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest bool, skipUpgradeHeights map[int64]bool,
	homePath string, invCheckPeriod uint, encodingConfig simappparams.EncodingConfig,
	appOpts servertypes.AppOptions, baseAppOptions ...func(*baseapp.BaseApp),
) *SimApp

NewSimApp returns a reference to an initialized SimApp.

func Setup

func Setup(isCheckTx bool) *SimApp

Setup initializes a new SimApp. A Nop logger is set in SimApp.

func SetupWithGenesisAccounts

func SetupWithGenesisAccounts(genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) *SimApp

SetupWithGenesisAccounts initializes a new SimApp with the provided genesis accounts and possible balances.

func SetupWithGenesisValSet

func SetupWithGenesisValSet(t *testing.T, valSet *tmtypes.ValidatorSet, genAccs []authtypes.GenesisAccount, balances ...banktypes.Balance) *SimApp

SetupWithGenesisValSet initializes a new SimApp with a validator set and genesis accounts that also act as delegators. For simplicity, each validator is bonded with a delegation of one consensus engine unit (10^6) in the default token of the simapp from first genesis account. A Nop logger is set in SimApp.

func (*SimApp) AppCodec

func (app *SimApp) AppCodec() codec.Codec

AppCodec returns SimApp's app codec.

NOTE: This is solely to be used for testing purposes as it may be desirable for modules to register their own custom testing types.

func (*SimApp) BeginBlocker

func (app *SimApp) BeginBlocker(ctx sdk.Context, req abci.RequestBeginBlock) abci.ResponseBeginBlock

BeginBlocker application updates every begin block

func (*SimApp) EndBlocker

func (app *SimApp) EndBlocker(ctx sdk.Context, req abci.RequestEndBlock) abci.ResponseEndBlock

EndBlocker application updates every end block

func (*SimApp) ExportAppStateAndValidators

func (app *SimApp) ExportAppStateAndValidators(
	forZeroHeight bool, jailAllowedAddrs []string,
) (servertypes.ExportedApp, error)

ExportAppStateAndValidators exports the state of the application for a genesis file.

func (*SimApp) GetKey

func (app *SimApp) GetKey(storeKey string) *sdk.KVStoreKey

GetKey returns the KVStoreKey for the provided store key.

NOTE: This is solely to be used for testing purposes.

func (*SimApp) GetMemKey

func (app *SimApp) GetMemKey(storeKey string) *sdk.MemoryStoreKey

GetMemKey returns the MemStoreKey for the provided mem key.

NOTE: This is solely used for testing purposes.

func (*SimApp) GetSubspace

func (app *SimApp) GetSubspace(moduleName string) paramstypes.Subspace

GetSubspace returns a param subspace for a given module name.

NOTE: This is solely to be used for testing purposes.

func (*SimApp) GetTKey

func (app *SimApp) GetTKey(storeKey string) *sdk.TransientStoreKey

GetTKey returns the TransientStoreKey for the provided store key.

NOTE: This is solely to be used for testing purposes.

func (*SimApp) InitChainer

func (app *SimApp) InitChainer(ctx sdk.Context, req abci.RequestInitChain) abci.ResponseInitChain

InitChainer application update at chain initialization

func (*SimApp) InterfaceRegistry

func (app *SimApp) InterfaceRegistry() types.InterfaceRegistry

InterfaceRegistry returns SimApp's InterfaceRegistry

func (*SimApp) LegacyAmino

func (app *SimApp) LegacyAmino() *codec.LegacyAmino

LegacyAmino returns SimApp's amino codec.

NOTE: This is solely to be used for testing purposes as it may be desirable for modules to register their own custom testing types.

func (*SimApp) LoadHeight

func (app *SimApp) LoadHeight(height int64) error

LoadHeight loads a particular height

func (*SimApp) ModuleAccountAddrs

func (app *SimApp) ModuleAccountAddrs() map[string]bool

ModuleAccountAddrs returns all the app's module account addresses.

func (*SimApp) Name

func (app *SimApp) Name() string

Name returns the name of the App

func (*SimApp) RegisterAPIRoutes

func (app *SimApp) RegisterAPIRoutes(apiSvr *api.Server, apiConfig config.APIConfig)

RegisterAPIRoutes registers all application module routes with the provided API server.

func (*SimApp) RegisterTendermintService

func (app *SimApp) RegisterTendermintService(clientCtx client.Context)

RegisterTendermintService implements the Application.RegisterTendermintService method.

func (*SimApp) RegisterTxService

func (app *SimApp) RegisterTxService(clientCtx client.Context)

RegisterTxService implements the Application.RegisterTxService method.

func (*SimApp) SimulationManager

func (app *SimApp) SimulationManager() *module.SimulationManager

SimulationManager implements the SimulationApp interface

type SimGenesisAccount

type SimGenesisAccount struct {

	// vesting account fields
	OriginalVesting  sdk.Coins `json:"original_vesting" yaml:"original_vesting"`   // total vesting coins upon initialization
	DelegatedFree    sdk.Coins `json:"delegated_free" yaml:"delegated_free"`       // delegated vested coins at time of delegation
	DelegatedVesting sdk.Coins `json:"delegated_vesting" yaml:"delegated_vesting"` // delegated vesting coins at time of delegation
	StartTime        int64     `json:"start_time" yaml:"start_time"`               // vesting start time (UNIX Epoch time)
	EndTime          int64     `json:"end_time" yaml:"end_time"`                   // vesting end time (UNIX Epoch time)

	// module account fields
	ModuleName        string   `json:"module_name" yaml:"module_name"`               // name of the module account
	ModulePermissions []string `json:"module_permissions" yaml:"module_permissions"` // permissions of module account

SimGenesisAccount defines a type that implements the GenesisAccount interface to be used for simulation accounts in the genesis state.

func (SimGenesisAccount) Validate

func (sga SimGenesisAccount) Validate() error

Validate checks for errors on the vesting and module account parameters


Path Synopsis
Package params defines the simulation parameters in the simapp.
Package params defines the simulation parameters in the simapp.

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