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params.go
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params.go
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package simulation
import (
"encoding/json"
"fmt"
"math/rand"
abci "github.com/tendermint/tendermint/abci/types"
tmproto "github.com/tendermint/tendermint/proto/tendermint/types"
"github.com/tendermint/tendermint/types"
"github.com/cosmos/cosmos-sdk/codec"
"github.com/cosmos/cosmos-sdk/types/simulation"
stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
markov "github.com/merlinslair/merlin/simulation/simtypes/transitionmatrix"
)
const (
// Minimum time per block
minTimePerBlock int64 = 10000 / 2
// Maximum time per block
maxTimePerBlock int64 = 10000
)
// TODO: explain transitional matrix usage
var (
// Currently there are 3 different liveness types,
// fully online, spotty connection, offline.
defaultLivenessTransitionMatrix, _ = markov.CreateTransitionMatrix([][]int{
{90, 20, 1},
{10, 50, 5},
{0, 10, 1000},
})
// 3 states: rand in range [0, 4*provided blocksize],
// rand in range [0, 2 * provided blocksize], 0
defaultBlockSizeTransitionMatrix, _ = markov.CreateTransitionMatrix([][]int{
{85, 5, 0},
{15, 92, 40},
{0, 3, 60},
})
)
// Params define the parameters necessary for running the simulations
type Params struct {
pastEvidenceFraction float64
numKeys int
evidenceFraction float64
initialLivenessWeightings []int
livenessTransitionMatrix simulation.TransitionMatrix
blockSizeTransitionMatrix simulation.TransitionMatrix
}
func (p Params) PastEvidenceFraction() float64 {
return p.pastEvidenceFraction
}
func (p Params) NumKeys() int {
return p.numKeys
}
func (p Params) EvidenceFraction() float64 {
return p.evidenceFraction
}
func (p Params) InitialLivenessWeightings() []int {
return p.initialLivenessWeightings
}
func (p Params) LivenessTransitionMatrix() simulation.TransitionMatrix {
return p.livenessTransitionMatrix
}
func (p Params) BlockSizeTransitionMatrix() simulation.TransitionMatrix {
return p.blockSizeTransitionMatrix
}
// RandomParams returns random simulation parameters
func RandomParams(r *rand.Rand) Params {
return Params{
pastEvidenceFraction: r.Float64(),
numKeys: simulation.RandIntBetween(r, 50, 2500), // number of accounts created for the simulation
evidenceFraction: r.Float64() / 2,
initialLivenessWeightings: []int{simulation.RandIntBetween(r, 1, 80), r.Intn(10), r.Intn(10)},
livenessTransitionMatrix: defaultLivenessTransitionMatrix,
blockSizeTransitionMatrix: defaultBlockSizeTransitionMatrix,
}
}
// DefaultRandomConsensusParams returns random simulation consensus parameters, it extracts the Evidence from the Staking genesis state.
func DefaultRandomConsensusParams(r *rand.Rand, appState json.RawMessage, cdc codec.JSONCodec) *abci.ConsensusParams {
var genesisState map[string]json.RawMessage
err := json.Unmarshal(appState, &genesisState)
if err != nil {
panic(err)
}
stakingGenesisState := stakingtypes.GetGenesisStateFromAppState(cdc, genesisState)
consensusParams := &abci.ConsensusParams{
Block: &abci.BlockParams{
MaxBytes: int64(simulation.RandIntBetween(r, 20000000, 30000000)),
MaxGas: -1,
},
Validator: &tmproto.ValidatorParams{
PubKeyTypes: []string{types.ABCIPubKeyTypeEd25519},
},
Evidence: &tmproto.EvidenceParams{
MaxAgeNumBlocks: int64(stakingGenesisState.Params.UnbondingTime / AverageBlockTime),
MaxAgeDuration: stakingGenesisState.Params.UnbondingTime,
},
Version: &tmproto.VersionParams{
AppVersion: uint64(simulation.RandIntBetween(r, 0, 10000)),
},
}
bz, err := json.MarshalIndent(&consensusParams, "", " ")
if err != nil {
panic(err)
}
fmt.Printf("Selected randomly generated consensus parameters:\n%s\n", bz)
return consensusParams
}