simapp

package
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 Go to latest Published: Aug 15, 2020 License: Apache-2.0 Imports: 38 Imported by: 0

Documentation

Overview

Package simapp implements a full fledged Cosmos SDK application used for executing simulation test suites.

Simulation App

The SimApp type defines an application used for running extensive simulation testing suites. It contains all core modules, including governance, staking, slashing, and distribution.

Simulation is executed with various inputs including the number of blocks to simulate, the block size, whether the app should commit or not, the invariant checking period, and a seed which is used as a source of pseudo-randomness.

In addition to the various inputs, simulation runs mainly in three modes:

1. Completely random where the initial state, module parameters and simulation parameters are pseudo-randomly generated.

2. From a genesis file where the initial state and the module parameters are defined. This mode is helpful for running simulations on a known state such as a live network export where a new (mostly likely breaking) version of the application needs to be tested.

3. From a params file where the initial state is pseudo-randomly generated but the module and simulation parameters can be provided manually. This allows for a more controlled and deterministic simulation setup while allowing the state space to still be pseudo-randomly simulated.

The simulation test suite also supports testing determinism and import/export functionality.

Randomness

Currently, simulation uses a single seed (integer) as a source for a PRNG by which all random operations are executed from. Any call to the PRNG changes all future operations as the internal state of the PRNG is modified. For example, if a new message type is created and needs to be simulated, the new introduced PRNG call will change all subsequent operations.

This may can often be problematic when testing fixes to simulation faults. One current solution to this is to use a params file as mentioned above. In the future the simulation suite is expected to support a series of PRNGs that can be used uniquely per module and simulation component so that they will not effect each others state execution outcome.

Usage

To execute a completely pseudo-random simulation: 

 $ go test -mod=readonly github.com/cosmos/cosmos-sdk/simapp \
	-run=TestFullAppSimulation \
	-Enabled=true \
	-NumBlocks=100 \
	-BlockSize=200 \
	-Commit=true \
	-Seed=99 \
	-Period=5 \
	-v -timeout 24h

To execute simulation from a genesis file: 

 $ go test -mod=readonly github.com/cosmos/cosmos-sdk/simapp \
 	-run=TestFullAppSimulation \
 	-Enabled=true \
 	-NumBlocks=100 \
 	-BlockSize=200 \
 	-Commit=true \
 	-Seed=99 \
 	-Period=5 \
	-Genesis=/path/to/genesis.json \
 	-v -timeout 24h

To execute simulation from a simulation params file: 

 $ go test -mod=readonly github.com/cosmos/cosmos-sdk/simapp \
	-run=TestFullAppSimulation \
	-Enabled=true \
	-NumBlocks=100 \
	-BlockSize=200 \
	-Commit=true \
	-Seed=99 \
	-Period=5 \
	-Params=/path/to/params.json \
	-v -timeout 24h

To export the simulation params to a file at a given block height: 

 $ go test -mod=readonly github.com/cosmos/cosmos-sdk/simapp \
 	-run=TestFullAppSimulation \
 	-Enabled=true \
 	-NumBlocks=100 \
 	-BlockSize=200 \
 	-Commit=true \
 	-Seed=99 \
 	-Period=5 \
	-ExportParamsPath=/path/to/params.json \
	-ExportParamsHeight=50 \
	 -v -timeout 24h

To export the simulation app state (i.e genesis) to a file: 

 $ go test -mod=readonly github.com/cosmos/cosmos-sdk/simapp \
 	-run=TestFullAppSimulation \
 	-Enabled=true \
 	-NumBlocks=100 \
 	-BlockSize=200 \
 	-Commit=true \
 	-Seed=99 \
 	-Period=5 \
	-ExportStatePath=/path/to/genesis.json \
	 v -timeout 24h

Params

Params that are provided to simulation from a JSON file are used to used to set both module parameters and simulation parameters. See sim_test.go for the full set of parameters that can be provided.

nolint

Index

Constants

View Source 
const (
	StakePerAccount                                    = "stake_per_account"
	InitiallyBondedValidators                          = "initially_bonded_validators"
	OpWeightDeductFee                                  = "op_weight_deduct_fee"
	OpWeightMsgSend                                    = "op_weight_msg_send"
	OpWeightSingleInputMsgMultiSend                    = "op_weight_single_input_msg_multisend"
	OpWeightMsgSetWithdrawAddress                      = "op_weight_msg_set_withdraw_address"
	OpWeightMsgWithdrawDelegationReward                = "op_weight_msg_withdraw_delegation_reward"
	OpWeightMsgWithdrawValidatorCommission             = "op_weight_msg_withdraw_validator_commission"
	OpWeightSubmitVotingSlashingTextProposal           = "op_weight_submit_voting_slashing_text_proposal"
	OpWeightSubmitVotingSlashingCommunitySpendProposal = "op_weight_submit_voting_slashing_community_spend_proposal"
	OpWeightSubmitVotingSlashingParamChangeProposal    = "op_weight_submit_voting_slashing_param_change_proposal"
	OpWeightMsgDeposit                                 = "op_weight_msg_deposit"
	OpWeightMsgCreateValidator                         = "op_weight_msg_create_validator"
	OpWeightMsgEditValidator                           = "op_weight_msg_edit_validator"
	OpWeightMsgDelegate                                = "op_weight_msg_delegate"
	OpWeightMsgUndelegate                              = "op_weight_msg_undelegate"
	OpWeightMsgBeginRedelegate                         = "op_weight_msg_begin_redelegate"
	OpWeightMsgUnjail                                  = "op_weight_msg_unjail"
)

Simulation parameter constants

Variables

View Source 
var (
	// default home directories for the application CLI
	DefaultCLIHome = os.ExpandEnv("$HOME/.simapp")

	// default home directories for the application daemon
	DefaultNodeHome = os.ExpandEnv("$HOME/.simapp")

	// The module BasicManager is in charge of setting up basic,
	// non-dependant module elements, such as codec registration
	// and genesis verification.
	ModuleBasics = module.NewBasicManager(
		genaccounts.AppModuleBasic{},
		genutil.AppModuleBasic{},
		auth.AppModuleBasic{},
		bank.AppModuleBasic{},
		staking.AppModuleBasic{},
		mint.AppModuleBasic{},
		distr.AppModuleBasic{},
		gov.NewAppModuleBasic(paramsclient.ProposalHandler, distr.ProposalHandler),
		params.AppModuleBasic{},
		crisis.AppModuleBasic{},
		slashing.AppModuleBasic{},
		supply.AppModuleBasic{},
		asset.AppModuleBasic{},
	)
)

Functions

func AppStateFromGenesisFileFn 

func AppStateFromGenesisFileFn(
	r *rand.Rand, _ []simulation.Account, _ time.Time,
) (json.RawMessage, []simulation.Account, string)

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

func DecodeAccountStore 

func DecodeAccountStore(cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) string

DecodeAccountStore unmarshals the KVPair's Value to the corresponding auth type

func DecodeDistributionStore 

func DecodeDistributionStore(cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) string

DecodeDistributionStore unmarshals the KVPair's Value to the corresponding distribution type

func DecodeGovStore 

func DecodeGovStore(cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) string

DecodeGovStore unmarshals the KVPair's Value to the corresponding gov type

func DecodeMintStore 

func DecodeMintStore(cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) string

DecodeMintStore unmarshals the KVPair's Value to the corresponding mint type

func DecodeSlashingStore 

func DecodeSlashingStore(cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) string

DecodeSlashingStore unmarshals the KVPair's Value to the corresponding slashing type

func DecodeStakingStore 

func DecodeStakingStore(cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) string

DecodeStakingStore unmarshals the KVPair's Value to the corresponding staking type

func DecodeSupplyStore 

func DecodeSupplyStore(cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) string

DecodeSupplyStore unmarshals the KVPair's Value to the corresponding supply type

func GenAuthGenesisState 

func GenAuthGenesisState(cdc *codec.Codec, r *rand.Rand, ap simulation.AppParams, genesisState map[string]json.RawMessage)

GenAuthGenesisState generates a random GenesisState for auth

func GenBankGenesisState 

func GenBankGenesisState(cdc *codec.Codec, r *rand.Rand, ap simulation.AppParams, genesisState map[string]json.RawMessage)

GenBankGenesisState generates a random GenesisState for bank

func GenDistrGenesisState 

func GenDistrGenesisState(cdc *codec.Codec, r *rand.Rand, ap simulation.AppParams, genesisState map[string]json.RawMessage)

GenDistrGenesisState generates a random GenesisState for distribution

func GenGenesisAccounts 

func GenGenesisAccounts(
	cdc *codec.Codec, r *rand.Rand, accs []simulation.Account,
	genesisTimestamp time.Time, amount, numInitiallyBonded int64,
	genesisState map[string]json.RawMessage,
)

GenGenesisAccounts generates a random GenesisState for the genesis accounts

func GenGovGenesisState 

func GenGovGenesisState(cdc *codec.Codec, r *rand.Rand, ap simulation.AppParams, genesisState map[string]json.RawMessage)

GenGovGenesisState generates a random GenesisState for gov

func GenMintGenesisState 

func GenMintGenesisState(cdc *codec.Codec, r *rand.Rand, ap simulation.AppParams, genesisState map[string]json.RawMessage)

GenMintGenesisState generates a random GenesisState for mint

func GenSlashingGenesisState 

func GenSlashingGenesisState(
	cdc *codec.Codec, r *rand.Rand, stakingGen staking.GenesisState,
	ap simulation.AppParams, genesisState map[string]json.RawMessage,
)

GenSlashingGenesisState generates a random GenesisState for slashing

func GenStakingGenesisState 

func GenStakingGenesisState(
	cdc *codec.Codec, r *rand.Rand, accs []simulation.Account, amount, numAccs, numInitiallyBonded int64,
	ap simulation.AppParams, genesisState map[string]json.RawMessage,
) staking.GenesisState

GenStakingGenesisState generates a random GenesisState for staking

func GenSupplyGenesisState 

func GenSupplyGenesisState(cdc *codec.Codec, amount, numInitiallyBonded, numAccs int64, genesisState map[string]json.RawMessage)

GenSupplyGenesisState generates a random GenesisState for supply

func GetSimulationLog 

func GetSimulationLog(storeName string, cdcA, cdcB *codec.Codec, kvA, kvB cmn.KVPair) (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 MakeCodec 

func MakeCodec() *codec.Codec

custom tx codec

Types

type GenesisState 

type GenesisState map[string]json.RawMessage

The genesis state 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() GenesisState

NewDefaultGenesisState generates the default state for the application.

type SimApp 

type SimApp struct {
	*bam.BaseApp
	// contains filtered or unexported fields
}

Extended ABCI application

func NewSimApp 

func NewSimApp(
	logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest bool,
	invCheckPeriod uint, baseAppOptions ...func(*bam.BaseApp),
) *SimApp

NewSimApp returns a reference to an initialized SimApp.

func NewSimAppUNSAFE 

func NewSimAppUNSAFE(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest bool,
	invCheckPeriod uint, baseAppOptions ...func(*baseapp.BaseApp),
) (gapp *SimApp, keyMain, keyStaking *sdk.KVStoreKey, stakingKeeper staking.Keeper)

NewSimAppUNSAFE is used for debugging purposes only.

NOTE: to not use this function with non-test code

func (*SimApp) BeginBlocker 

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

application updates every begin block

func (*SimApp) EndBlocker 

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

application updates every end block

func (*SimApp) ExportAppStateAndValidators 

func (app *SimApp) ExportAppStateAndValidators(
	forZeroHeight bool, jailWhiteList []string,
) (appState json.RawMessage, validators []tmtypes.GenesisValidator, err error)

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

func (*SimApp) InitChainer 

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

application update at chain initialization

func (*SimApp) LoadHeight 

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

load a particular height

func (*SimApp) ModuleAccountAddrs 

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

ModuleAccountAddrs returns all the app's module account addresses.

Source Files

View all Source files

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