simapp

package module
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 Go to latest Published: Apr 17, 2026 License: Apache-2.0 Imports: 107 Imported by: 115

README

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SimApp

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

  6. $ ./simd genesis 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 genesis 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 comet 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 CometBFT!

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.

Documentation

Index

Constants

View Source 
const UpgradeName = "v054-to-v055"

UpgradeName defines the on-chain upgrade name for the sample SimApp upgrade from v054 to v055.

NOTE: This upgrade defines a reference implementation of what an upgrade could look like when an application is migrating from Cosmos SDK version v0.54.x to v0.55.x.

Variables

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

Functions

func AddTestAddrsIncremental 

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

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

func BlockedAddresses 

func BlockedAddresses() map[string]bool

BlockedAddresses returns all the app's blocked account addresses.

func GetMaccPerms 

func GetMaccPerms() map[string][]string

GetMaccPerms returns a copy of the module account permissions

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

func NewTestNetworkFixture 

func NewTestNetworkFixture() network.TestFixture

NewTestNetworkFixture returns a new simapp AppConstructor for network simulation tests

Types

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 GenesisStateWithSingleValidator 

func GenesisStateWithSingleValidator(t *testing.T, app *SimApp) GenesisState

GenesisStateWithSingleValidator initializes GenesisState with a single validator and genesis accounts that also act as delegators.

type SetupOptions 

type SetupOptions struct {
	Logger  log.Logger
	DB      *dbm.MemDB
	AppOpts servertypes.AppOptions
}

SetupOptions defines arguments that are passed into `Simapp` constructor.

type SimApp 

type SimApp struct {
	*baseapp.BaseApp

	// essential keepers
	AccountKeeper         authkeeper.AccountKeeper
	BankKeeper            bankkeeper.BaseKeeper
	StakingKeeper         *stakingkeeper.Keeper
	SlashingKeeper        slashingkeeper.Keeper
	MintKeeper            mintkeeper.Keeper
	DistrKeeper           distrkeeper.Keeper
	GovKeeper             govkeeper.Keeper
	UpgradeKeeper         *upgradekeeper.Keeper
	EvidenceKeeper        evidencekeeper.Keeper
	ConsensusParamsKeeper consensusparamkeeper.Keeper

	// supplementary keepers
	FeeGrantKeeper     feegrantkeeper.Keeper
	AuthzKeeper        authzkeeper.Keeper
	EpochsKeeper       *epochskeeper.Keeper
	ProtocolPoolKeeper protocolpoolkeeper.Keeper

	// the module manager
	ModuleManager      *module.Manager
	BasicModuleManager module.BasicManager
	// 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,
	loadLatest bool,
	appOpts servertypes.AppOptions,
	baseAppOptions ...func(*baseapp.BaseApp),
) *SimApp

NewSimApp returns a reference to an initialized SimApp.

func NewSimappWithCustomOptions 

func NewSimappWithCustomOptions(t *testing.T, isCheckTx bool, options SetupOptions) *SimApp

NewSimappWithCustomOptions initializes a new SimApp with custom options.

func Setup 

func Setup(t *testing.T, isCheckTx bool) *SimApp

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

func SetupWithGenesisValSet 

func SetupWithGenesisValSet(t *testing.T, valSet *cmttypes.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 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) AutoCliOpts 

func (app *SimApp) AutoCliOpts() autocli.AppOptions

AutoCliOpts returns the autocli options for the app.

func (*SimApp) BeginBlocker 

func (app *SimApp) BeginBlocker(ctx sdk.Context) (sdk.BeginBlock, error)

BeginBlocker application updates every begin block

func (*SimApp) Configurator 

func (a *SimApp) Configurator() module.Configurator

func (*SimApp) DefaultGenesis 

func (a *SimApp) DefaultGenesis() map[string]json.RawMessage

DefaultGenesis returns a default genesis from the registered AppModuleBasic's.

func (*SimApp) EndBlocker 

func (app *SimApp) EndBlocker(ctx sdk.Context) (sdk.EndBlock, error)

EndBlocker application updates every end block

func (*SimApp) ExportAppStateAndValidators 

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

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

func (*SimApp) GetKey 

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

GetKey returns the KVStoreKey for the provided store key.

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

func (*SimApp) GetStoreKeys 

func (app *SimApp) GetStoreKeys() []storetypes.StoreKey

GetStoreKeys returns all the stored store keys.

func (*SimApp) InitChainer 

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

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) Name 

func (app *SimApp) Name() string

Name returns the name of the App

func (*SimApp) PreBlocker 

func (app *SimApp) PreBlocker(ctx sdk.Context, _ *abci.RequestFinalizeBlock) (*sdk.ResponsePreBlock, error)

PreBlocker application updates every pre block

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) RegisterNodeService 

func (app *SimApp) RegisterNodeService(clientCtx client.Context, cfg config.Config)

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) RegisterUpgradeHandlers 

func (app SimApp) RegisterUpgradeHandlers()

func (*SimApp) SimulationManager 

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

SimulationManager implements the SimulationApp interface

func (*SimApp) TxConfig 

func (app *SimApp) TxConfig() client.TxConfig

TxConfig returns SimApp's TxConfig

type SimGenesisAccount 

type SimGenesisAccount struct {
	*authtypes.BaseAccount

	// 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

type VoteExtension 

type VoteExtension struct {
	Hash   []byte
	Height int64
	Data   []byte
}

VoteExtension defines the structure used to create a dummy vote extension.

type VoteExtensionHandler 

type VoteExtensionHandler struct{}

VoteExtensionHandler defines a dummy vote extension handler for SimApp.

NOTE: This implementation is solely used for testing purposes. DO NOT use in a production application!

func NewVoteExtensionHandler 

func NewVoteExtensionHandler() *VoteExtensionHandler

func (*VoteExtensionHandler) ExtendVote 

func (h *VoteExtensionHandler) ExtendVote() sdk.ExtendVoteHandler

func (*VoteExtensionHandler) SetHandlers 

func (h *VoteExtensionHandler) SetHandlers(bApp *baseapp.BaseApp)

func (*VoteExtensionHandler) VerifyVoteExtension 

func (h *VoteExtensionHandler) VerifyVoteExtension() sdk.VerifyVoteExtensionHandler

Source Files

View all Source files

Directories

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

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