Add consensus params into Simulation

CHANGELOG.md

@@ -218,6 +218,7 @@ functionality that requires an online connection.
 * (types/rest) [\#5900](https://github.com/cosmos/cosmos-sdk/pull/5900) Add Check*Error function family to spare developers from replicating tons of boilerplate code.
 * (x/evidence) [\#5952](https://github.com/cosmos/cosmos-sdk/pull/5952) Tendermint Consensus parameters can now be changed via parameter change proposals through `x/gov`.
 * (x/auth/ante) [\#6040](https://github.com/cosmos/cosmos-sdk/pull/6040) `AccountKeeper` interface used for `NewAnteHandler` and handler's decorators to add support of using custom `AccountKeeper` implementations.
+* (simulation) [\#6002](https://github.com/cosmos/cosmos-sdk/pull/6002) Add randomized consensus params into simulation.
 
 ## [v0.38.3] - 2020-04-09
 

client/cmd_test.go

@@ -37,12 +37,12 @@ func TestValidateCmd(t *testing.T) {
 		args    []string
 		wantErr bool
 	}{
-		{"misspelled command", []string{"commission"}, true}, // nolint: misspell
+		{"misspelled command", []string{"COMMISSION"}, true},
 		{"no command provided", []string{}, false},
-		{"help flag", []string{"commission", "--help"}, false},       // nolint: misspell
-		{"shorthand help flag", []string{"commission", "-h"}, false}, // nolint: misspell
+		{"help flag", []string{"COMMISSION", "--help"}, false},
+		{"shorthand help flag", []string{"COMMISSION", "-h"}, false},
 		{"flag only, no command provided", []string{"--gas", "1000atom"}, false},
-		{"flag and misspelled command", []string{"--gas", "1000atom", "comission"}, true}, // nolint: misspell
+		{"flag and misspelled command", []string{"--gas", "1000atom", "COMMISSION"}, true},
 	}
 
 	for _, tt := range tests {

x/ibc/09-localhost/types/localhost_test.go

@@ -5,11 +5,12 @@ import (
 
 	"github.com/stretchr/testify/suite"
 
+	dbm "github.com/tendermint/tm-db"
+
 	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/store/cachekv"
 	"github.com/cosmos/cosmos-sdk/store/dbadapter"
 	commitmenttypes "github.com/cosmos/cosmos-sdk/x/ibc/23-commitment/types"
-	dbm "github.com/tendermint/tm-db"
 )
 
 const (

x/simulation/params.go

@@ -1,10 +1,18 @@
 package simulation
 
 import (
+	"encoding/json"
 	"fmt"
 	"math/rand"
 
+	"github.com/tendermint/tendermint/types"
+
+	"github.com/tendermint/go-amino"
+	abci "github.com/tendermint/tendermint/abci/types"
+
+	"github.com/cosmos/cosmos-sdk/codec"
 	"github.com/cosmos/cosmos-sdk/types/simulation"
+	stakingtypes "github.com/cosmos/cosmos-sdk/x/staking/types"
 )
 
 const (
@@ -142,3 +150,33 @@ func (w WeightedProposalContent) DefaultWeight() int {
 func (w WeightedProposalContent) ContentSimulatorFn() simulation.ContentSimulatorFn {
 	return w.contentSimulatorFn
 }
+
+//-----------------------------------------------------------------------------
+// Param change proposals
+
+// RandomParams returns random simulation consensus parameters, it extracts the Evidence from the Staking genesis state.
+func RandomConsensusParams(r *rand.Rand, appState json.RawMessage) *abci.ConsensusParams {
+	cdc := amino.NewCodec()
+
+	var genesisState map[string]json.RawMessage
+	cdc.UnmarshalJSON(appState, &genesisState)
+
+	stakingGenesisState := stakingtypes.GetGenesisStateFromAppState(cdc, genesisState)
+
+	consensusParams := &abci.ConsensusParams{
+		Block: &abci.BlockParams{
+			MaxBytes: int64(simulation.RandIntBetween(r, 20000000, 30000000)),
+			MaxGas:   -1,
+		},
+		Validator: &abci.ValidatorParams{
+			PubKeyTypes: []string{types.ABCIPubKeyTypeSecp256k1, types.ABCIPubKeyTypeEd25519},
+		},
+		Evidence: &abci.EvidenceParams{
+			MaxAgeNumBlocks: int64(stakingGenesisState.Params.UnbondingTime / AverageBlockTime),
+			MaxAgeDuration:  stakingGenesisState.Params.UnbondingTime,
+		},
+	}
+	fmt.Printf("Selected randomly generated consensus parameters:\n%s\n", codec.MustMarshalJSONIndent(cdc, consensusParams))
+
+	return consensusParams
+}

x/simulation/simulate.go

@@ -17,6 +17,8 @@ import (
 	"github.com/cosmos/cosmos-sdk/types/simulation"
 )
 
+const AverageBlockTime = 6 * time.Second
+
 // initialize the chain for the simulation
 func initChain(
 	r *rand.Rand, params Params, accounts []simulation.Account, app *baseapp.BaseApp,
@@ -25,9 +27,12 @@ func initChain(
 
 	appState, accounts, chainID, genesisTimestamp := appStateFn(r, accounts, config)
 
+	consensusParams := RandomConsensusParams(r, appState)
+
 	req := abci.RequestInitChain{
-		AppStateBytes: appState,
-		ChainId:       chainID,
+		AppStateBytes:   appState,
+		ChainId:         chainID,
+		ConsensusParams: consensusParams,
 	}
 	res := app.InitChain(req)
 	validators := newMockValidators(r, res.Validators, params)
@@ -108,7 +113,7 @@ func SimulateFromSeed(
 
 	// These are operations which have been queued by previous operations
 	operationQueue := NewOperationQueue()
-	timeOperationQueue := []simulation.FutureOperation{}
+	var timeOperationQueue []simulation.FutureOperation
 
 	logWriter := NewLogWriter(testingMode)
 

x/staking/types/genesis.go

@@ -1,6 +1,9 @@
 package types
 
 import (
+	"encoding/json"
+
+	"github.com/cosmos/cosmos-sdk/codec"
 	sdk "github.com/cosmos/cosmos-sdk/types"
 )
 
@@ -37,3 +40,14 @@ func DefaultGenesisState() GenesisState {
 		Params: DefaultParams(),
 	}
 }
+
+// GetGenesisStateFromAppState returns x/staking GenesisState given raw application
+// genesis state.
+func GetGenesisStateFromAppState(cdc *codec.Codec, appState map[string]json.RawMessage) GenesisState {
+	var genesisState GenesisState
+	if appState[ModuleName] != nil {
+		cdc.MustUnmarshalJSON(appState[ModuleName], &genesisState)
+	}
+
+	return genesisState
+}