simulation

package
v0.34.7 Latest Latest
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 Go to latest Published: Oct 3, 2019 License: Apache-2.0 Imports: 20 Imported by: 0

Documentation

Overview

Package simulation implements a simulation framework for any state machine built on the SDK which utilizes auth.

It is primarily intended for fuzz testing the integration of modules. It will test that the provided operations are interoperable, and that the desired invariants hold. It can additionally be used to detect what the performance benchmarks in the system are, by using benchmarking mode and cpu / mem profiling. If it detects a failure, it provides the entire log of what was ran.

The simulator takes as input: a random seed, the set of operations to run, the invariants to test, and additional parameters to configure how long to run, and misc. parameters that affect simulation speed.

It is intended that every module provides a list of Operations which will randomly create and run a message / tx in a manner that is interesting to fuzz, and verify that the state transition was executed as expected. Each module should additionally provide methods to assert that the desired invariants hold.

Then to perform a randomized simulation, select the set of desired operations, the weightings for each, the invariants you want to test, and how long to run it for. Then run simulation.Simulate! The simulator will handle things like ensuring that validators periodically double signing, or go offline.

Index

Constants

View Source 
const (
	BeginBlockEntryKind  = "begin_block"
	EndBlockEntryKind    = "end_block"
	MsgEntryKind         = "msg"
	QueuedsgMsgEntryKind = "queued_msg"
)

entry kinds for use within OperationEntry

Variables

This section is empty.

Functions

func DeriveRand 

func DeriveRand(r *rand.Rand) *rand.Rand

Derive a new rand deterministically from a rand. Unlike rand.New(rand.NewSource(seed)), the result is "more random" depending on the source and state of r. NOTE: not crypto safe.

func GetMemberOfInitialState 

func GetMemberOfInitialState(r *rand.Rand, weights []int) int

GetMemberOfInitialState takes an initial array of weights, of size n. It returns a weighted random number in [0,n).

func PeriodicInvariant 

func PeriodicInvariant(invariant sdk.Invariant, period int, offset int) sdk.Invariant

PeriodicInvariant returns an Invariant function closure that asserts a given invariant if the mock application's last block modulo the given period is congruent to the given offset.

NOTE this function is intended to be used manually used while running computationally heavy simulations. TODO reference this function in the codebase probably through use of a switch

func RandIntBetween 

func RandIntBetween(r *rand.Rand, min, max int) int

RandIntBetween returns a random int between two numbers inclusively.

func RandStringOfLength 

func RandStringOfLength(r *rand.Rand, n int) string

shamelessly copied from https://stackoverflow.com/questions/22892120/how-to-generate-a-random-string-of-a-fixed-length-in-golang#31832326 Generate a random string of a particular length

func RandTimestamp 

func RandTimestamp(r *rand.Rand) time.Time

RandTimestamp generates a random timestamp

func RandomAmount 

func RandomAmount(r *rand.Rand, max sdk.Int) sdk.Int

Generate a random amount Note: The range of RandomAmount includes max, and is, in fact, biased to return max as well as 0.

func RandomDecAmount 

func RandomDecAmount(r *rand.Rand, max sdk.Dec) sdk.Dec

RandomDecAmount generates a random decimal amount Note: The range of RandomDecAmount includes max, and is, in fact, biased to return max as well as 0.

func RandomRequestBeginBlock 

func RandomRequestBeginBlock(r *rand.Rand, params Params,
	validators mockValidators, pastTimes []time.Time,
	pastVoteInfos [][]abci.VoteInfo,
	event func(string), header abci.Header) abci.RequestBeginBlock

RandomRequestBeginBlock generates a list of signing validators according to the provided list of validators, signing fraction, and evidence fraction

func Simulate 

func Simulate(t *testing.T, app *baseapp.BaseApp,
	appStateFn AppStateFn, ops WeightedOperations,
	invariants sdk.Invariants, numBlocks, blockSize int, commit, lean bool) (bool, error)

Simulate tests application by sending random messages.

func SimulateFromSeed 

func SimulateFromSeed(tb testing.TB, app *baseapp.BaseApp,
	appStateFn AppStateFn, seed int64, ops WeightedOperations,
	invariants sdk.Invariants,
	numBlocks, blockSize int, commit, lean bool) (stopEarly bool, simError error)

SimulateFromSeed tests an application by running the provided operations, testing the provided invariants, but using the provided seed. TODO split this monster function up

Types

type Account 

type Account struct {
	PrivKey crypto.PrivKey
	PubKey  crypto.PubKey
	Address sdk.AccAddress
}

Account contains a privkey, pubkey, address tuple eventually more useful data can be placed in here. (e.g. number of coins)

func RandomAcc 

func RandomAcc(r *rand.Rand, accs []Account) Account

RandomAcc pick a random account from an array

func RandomAccounts 

func RandomAccounts(r *rand.Rand, n int) []Account

RandomAccounts generates n random accounts

func (Account) Equals 

func (acc Account) Equals(acc2 Account) bool

are two accounts equal

type AppStateFn 

type AppStateFn func(r *rand.Rand, accs []Account, genesisTimestamp time.Time) (appState json.RawMessage, accounts []Account, chainId string)

AppStateFn returns the app state json bytes, the genesis accounts, and the chain identifier

type DummyLogWriter 

type DummyLogWriter struct{}

_____________________ dummy log writter

func (*DummyLogWriter) AddEntry 

func (lw *DummyLogWriter) AddEntry(_ OperationEntry)

do nothing

func (*DummyLogWriter) PrintLogs 

func (lw *DummyLogWriter) PrintLogs()

do nothing

type FutureOperation 

type FutureOperation struct {
	BlockHeight int
	BlockTime   time.Time
	Op          Operation
}

FutureOperation is an operation which will be ran at the beginning of the provided BlockHeight. If both a BlockHeight and BlockTime are specified, it will use the BlockHeight. In the (likely) event that multiple operations are queued at the same block height, they will execute in a FIFO pattern.

type LogWriter 

type LogWriter interface {
	AddEntry(OperationEntry)
	PrintLogs()
}

log writter

func NewLogWriter 

func NewLogWriter(testingmode bool) LogWriter

LogWriter - return a dummy or standard log writer given the testingmode

type Operation 

type Operation func(r *rand.Rand, app *baseapp.BaseApp,
	ctx sdk.Context, accounts []Account) (
	OperationMsg OperationMsg, futureOps []FutureOperation, err error)

Operation runs a state machine transition, and ensures the transition happened as expected. The operation could be running and testing a fuzzed transaction, or doing the same for a message.

For ease of debugging, an operation returns a descriptive message "action", which details what this fuzzed state machine transition actually did.

Operations can optionally provide a list of "FutureOperations" to run later These will be ran at the beginning of the corresponding block.

type OperationEntry 

type OperationEntry struct {
	EntryKind string          `json:"entry_kind"`
	Height    int64           `json:"height"`
	Order     int64           `json:"order"`
	Operation json.RawMessage `json:"operation"`
}

OperationEntry - an operation entry for logging (ex. BeginBlock, EndBlock, XxxMsg, etc)

func BeginBlockEntry 

func BeginBlockEntry(height int64) OperationEntry

BeginBlockEntry - operation entry for begin block

func EndBlockEntry 

func EndBlockEntry(height int64) OperationEntry

EndBlockEntry - operation entry for end block

func MsgEntry 

func MsgEntry(height int64, opMsg OperationMsg, order int64) OperationEntry

MsgEntry - operation entry for standard msg

func QueuedMsgEntry 

func QueuedMsgEntry(height int64, opMsg OperationMsg) OperationEntry

MsgEntry - operation entry for queued msg

func (OperationEntry) MustMarshal 

func (oe OperationEntry) MustMarshal() json.RawMessage

OperationEntry - log entry text for this operation entry

type OperationMsg 

type OperationMsg struct {
	Route   string          `json:"route"`
	Name    string          `json:"name"`
	Comment string          `json:"comment"`
	OK      bool            `json:"ok"`
	Msg     json.RawMessage `json:"msg"`
}

OperationMsg - structure for operation output

func NewOperationMsg 

func NewOperationMsg(msg sdk.Msg, ok bool, comment string) OperationMsg

OperationMsg - create a new operation message from sdk.Msg

func NewOperationMsgBasic 

func NewOperationMsgBasic(route, name, comment string, ok bool, msg []byte) OperationMsg

OperationMsg - create a new operation message from raw input

func NoOpMsg 

func NoOpMsg() OperationMsg

NoOpMsg - create a no-operation message

func (OperationMsg) LogEvent 

func (om OperationMsg) LogEvent(eventLogger func(string))

add event for event stats

func (OperationMsg) MustMarshal 

func (om OperationMsg) MustMarshal() json.RawMessage

Marshal the operation msg, panic on error

func (OperationMsg) String 

func (om OperationMsg) String() string

log entry text for this operation msg

type OperationQueue 

type OperationQueue map[int][]Operation

queue of operations

type Params 

type Params struct {
	PastEvidenceFraction      float64
	NumKeys                   int
	EvidenceFraction          float64
	InitialLivenessWeightings []int
	LivenessTransitionMatrix  TransitionMatrix
	BlockSizeTransitionMatrix TransitionMatrix
}

Simulation parameters

func DefaultParams 

func DefaultParams() Params

Return default simulation parameters

func RandomParams 

func RandomParams(r *rand.Rand) Params

Return random simulation parameters

type StandardLogWriter 

type StandardLogWriter struct {
	OpEntries []OperationEntry `json:"op_entries"`
}

log writter

func (*StandardLogWriter) AddEntry 

func (lw *StandardLogWriter) AddEntry(opEntry OperationEntry)

add an entry to the log writter

func (*StandardLogWriter) PrintLogs 

func (lw *StandardLogWriter) PrintLogs()

PrintLogs - print the logs to a simulation file

type TransitionMatrix 

type TransitionMatrix struct {
	// contains filtered or unexported fields
}

TransitionMatrix is _almost_ a left stochastic matrix. It is technically not one due to not normalizing the column values. In the future, if we want to find the steady state distribution, it will be quite easy to normalize these values to get a stochastic matrix. Floats aren't currently used as the default due to non-determinism across architectures

func CreateTransitionMatrix 

func CreateTransitionMatrix(weights [][]int) (TransitionMatrix, error)

CreateTransitionMatrix creates a transition matrix from the provided weights. TODO: Provide example usage

func (TransitionMatrix) NextState 

func (t TransitionMatrix) NextState(r *rand.Rand, i int) int

NextState returns the next state randomly chosen using r, and the weightings provided in the transition matrix.

type WeightedOperation 

type WeightedOperation struct {
	Weight int
	Op     Operation
}

WeightedOperation is an operation with associated weight. This is used to bias the selection operation within the simulator.

type WeightedOperations 

type WeightedOperations []WeightedOperation

WeightedOperations is the group of all weighted operations to simulate.

Source Files

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