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Published: Jul 19, 2024 License: Apache-2.0 Imports: 138 Imported by: 61


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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 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.




View Source
const UpgradeName = "v050-to-v051"

UpgradeName defines the on-chain upgrade name for the sample SimApp upgrade from v0.50.x to v0.51.x

NOTE: This upgrade defines a reference implementation of what an upgrade could look like when an application is migrating from Cosmos SDK version v0.50.x to v0.51.x.


View Source
var DefaultNodeHome string

DefaultNodeHome default home directories for the application daemon


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 AppConfig

func AppConfig() depinject.Config

AppConfig returns the default app config.

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 NewAnteHandler

func NewAnteHandler(options HandlerOptions) (sdk.AnteHandler, error)

NewAnteHandler returns an AnteHandler that checks and increments sequence numbers, checks signatures & account numbers, and deducts fees from the first signer.

func NewTestNetworkFixture

func NewTestNetworkFixture() network.TestFixture

NewTestNetworkFixture returns a new simapp AppConstructor for network simulation tests

func ProvideExampleMintFn

func ProvideExampleMintFn(bankKeeper MintBankKeeper) minttypes.MintFn

ProvideExampleMintFn returns the function used in x/mint's endblocker to mint new tokens. Note that this function can not have the mint keeper as a parameter because it would create a cyclic dependency.


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 module manager which populates json from each module 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 HandlerOptions

type HandlerOptions struct {
	CircuitKeeper circuitante.CircuitBreaker
	TxManager     *unorderedtx.Manager

HandlerOptions are the options required for constructing a default SDK AnteHandler.

type MintBankKeeper

type MintBankKeeper interface {
	MintCoins(ctx context.Context, moduleName string, coins sdk.Coins) error
	SendCoinsFromModuleToModule(ctx context.Context, senderModule, recipientModule string, amt sdk.Coins) error

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 {

	UnorderedTxManager *unorderedtx.Manager

	// keepers
	AccountsKeeper        accounts.Keeper
	AuthKeeper            authkeeper.AccountKeeper
	BankKeeper            bankkeeper.Keeper
	StakingKeeper         *stakingkeeper.Keeper
	SlashingKeeper        slashingkeeper.Keeper
	MintKeeper            mintkeeper.Keeper
	DistrKeeper           distrkeeper.Keeper
	GovKeeper             *govkeeper.Keeper
	UpgradeKeeper         *upgradekeeper.Keeper
	AuthzKeeper           authzkeeper.Keeper
	EvidenceKeeper        evidencekeeper.Keeper
	FeeGrantKeeper        feegrantkeeper.Keeper
	GroupKeeper           groupkeeper.Keeper
	NFTKeeper             nftkeeper.Keeper
	ConsensusParamsKeeper consensuskeeper.Keeper
	CircuitBreakerKeeper  circuitkeeper.Keeper
	PoolKeeper            poolkeeper.Keeper
	EpochsKeeper          *epochskeeper.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,
	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) Close

func (app *SimApp) Close() error

Close implements the Application interface and closes all necessary application resources.

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) InterfaceRegistry

func (app *SimApp) InterfaceRegistry() codectypes.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) RegisterAPIRoutes

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

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

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 {

	// 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


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

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