test: enable the simulator for the provider module

.github/workflows/simulation.yml

@@ -0,0 +1,44 @@
+name: Simulation
+on:
+  workflow_call:
+  pull_request:
+  merge_group:
+  push:
+    branches:
+      - main
+      - release/v*
+      - feat/*
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ci-${{ github.ref }}-tests
+  cancel-in-progress: true
+
+jobs:
+  simulation:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: "1.22"
+          check-latest: true
+          cache: true
+          cache-dependency-path: go.sum
+      - uses: technote-space/[email protected]
+        id: git_diff
+        with:
+          PATTERNS: |
+            **/*.go
+            go.mod
+            go.sum
+            **/go.mod
+            **/go.sum
+            **/Makefile
+            Makefile
+      - name: simulation test
+        if: env.GIT_DIFF
+        run: |
+          make sim-full

Makefile

@@ -145,6 +145,13 @@ verify-models:
 	../run_invariants.sh
 
 
+###############################################################################
+###                         Simulation tests                                ###
+
+# Run a full simulation test
+sim-full:
+	cd app/provider;\
+	go test -mod=readonly -run=^TestFullAppSimulation$  -Enabled=true -NumBlocks=500 -BlockSize=200 -Commit=true -timeout 24h github.com/cosmos/interchain-security/v5/app/provider -v
 
 ###############################################################################
 ###                                Linting                                  ###

app/provider/app.go

@@ -66,6 +66,7 @@ import (
 	authcodec "github.com/cosmos/cosmos-sdk/x/auth/codec"
 	authkeeper "github.com/cosmos/cosmos-sdk/x/auth/keeper"
 	"github.com/cosmos/cosmos-sdk/x/auth/posthandler"
+	authsims "github.com/cosmos/cosmos-sdk/x/auth/simulation"
 	authtx "github.com/cosmos/cosmos-sdk/x/auth/tx"
 	txmodule "github.com/cosmos/cosmos-sdk/x/auth/tx/config"
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
@@ -352,9 +353,7 @@ func New(
 	// Remove the ConsumerRewardsPool from the group of blocked recipient addresses in bank
 	// this is required for the provider chain to be able to receive tokens from
 	// the consumer chain
-	bankBlockedAddrs := app.ModuleAccountAddrs()
-	delete(bankBlockedAddrs, authtypes.NewModuleAddress(
-		providertypes.ConsumerRewardsPool).String())
+	bankBlockedAddrs := BankBlockedAddrs(app)
 
 	app.BankKeeper = bankkeeper.NewBaseKeeper(
 		appCodec,
@@ -679,6 +678,13 @@ func New(
 	}
 
 	// create the simulation manager and define the order of the modules for deterministic simulations
+	overrideModules := map[string]module.AppModuleSimulation{
+		authtypes.ModuleName: auth.NewAppModule(app.appCodec, app.AccountKeeper, authsims.RandomGenesisAccounts, app.GetSubspace(authtypes.ModuleName)),
+	}
+	app.sm = module.NewSimulationManagerFromAppModules(app.MM.Modules, overrideModules)
+
+	// register the store decoders for simulation tests
+	app.sm.RegisterStoreDecoders()
 
 	// Note this upgrade handler is just an example and may not be exactly what you need to implement.
 	// See https://docs.cosmos.network/v0.45/building-modules/upgrade.html
@@ -780,6 +786,13 @@ func New(
 	return app
 }
 
+func BankBlockedAddrs(app *App) map[string]bool {
+	bankBlockedAddrs := app.ModuleAccountAddrs()
+	delete(bankBlockedAddrs, authtypes.NewModuleAddress(
+		providertypes.ConsumerRewardsPool).String())
+	return bankBlockedAddrs
+}
+
 // Name returns the name of the App
 func (app *App) Name() string { return app.BaseApp.Name() }
 

app/provider/sim_test.go

@@ -0,0 +1,85 @@
+package app_test
+
+import (
+	"os"
+	"testing"
+
+	"cosmossdk.io/store"
+	"github.com/stretchr/testify/require"
+
+	"github.com/cosmos/cosmos-sdk/baseapp"
+	"github.com/cosmos/cosmos-sdk/client/flags"
+	"github.com/cosmos/cosmos-sdk/server"
+	simtestutil "github.com/cosmos/cosmos-sdk/testutil/sims"
+	"github.com/cosmos/cosmos-sdk/x/simulation"
+	simcli "github.com/cosmos/cosmos-sdk/x/simulation/client/cli"
+
+	simtypes "github.com/cosmos/cosmos-sdk/types/simulation"
+
+	providerapp "github.com/cosmos/interchain-security/v5/app/provider"
+)
+
+func init() {
+	simcli.GetSimulatorFlags()
+}
+
+// interBlockCacheOpt returns a BaseApp option function that sets the persistent
+// inter-block write-through cache.
+func interBlockCacheOpt() func(*baseapp.BaseApp) {
+	return baseapp.SetInterBlockCache(store.NewCommitKVStoreCacheManager())
+}
+
+// fauxMerkleModeOpt returns a BaseApp option to use a dbStoreAdapter instead of
+// an IAVLStore for faster simulation speed.
+func fauxMerkleModeOpt(bapp *baseapp.BaseApp) {
+	bapp.SetFauxMerkleMode()
+}
+
+func TestFullAppSimulation(t *testing.T) {
+	config := simcli.NewConfigFromFlags()
+	config.ChainID = "provi"
+
+	db, dir, logger, skip, err := simtestutil.SetupSimulation(config, "leveldb-app-sim", "Simulation", simcli.FlagVerboseValue, simcli.FlagEnabledValue)
+	if skip {
+		t.Skip("skipping application simulation")
+	}
+	require.NoError(t, err, "simulation setup failed")
+
+	defer func() {
+		require.NoError(t, db.Close())
+		require.NoError(t, os.RemoveAll(dir))
+	}()
+
+	appOptions := make(simtestutil.AppOptionsMap, 0)
+	appOptions[flags.FlagHome] = providerapp.DefaultNodeHome
+	appOptions[server.FlagInvCheckPeriod] = simcli.FlagPeriodValue
+
+	app := providerapp.New(logger, db, nil, true, appOptions, fauxMerkleModeOpt, interBlockCacheOpt(), baseapp.SetChainID("provi"))
+	require.Equal(t, "interchain-security-p", app.Name())
+
+	encoding := providerapp.MakeTestEncodingConfig()
+
+	genesisState := providerapp.NewDefaultGenesisState(encoding.Codec)
+
+	// run randomized simulation
+	_, simParams, simErr := simulation.SimulateFromSeed(
+		t,
+		os.Stdout,
+		app.BaseApp,
+		simtestutil.AppStateFn(encoding.Codec, app.SimulationManager(), genesisState),
+		simtypes.RandomAccounts, // Replace with own random account function if using keys other than secp256k1
+		simtestutil.SimulationOperations(app, app.AppCodec(), config),
+		providerapp.BankBlockedAddrs(app),
+		config,
+		app.AppCodec(),
+	)
+
+	// export state and simParams before the simulation error is checked
+	err = simtestutil.CheckExportSimulation(app, config, simParams)
+	require.NoError(t, err)
+	require.NoError(t, simErr)
+
+	if config.Commit {
+		simtestutil.PrintStats(db)
+	}
+}

x/ccv/provider/keeper/invariants.go

@@ -0,0 +1,32 @@
+package keeper
+
+import (
+	"fmt"
+
+	sdk "github.com/cosmos/cosmos-sdk/types"
+	types "github.com/cosmos/interchain-security/v5/x/ccv/provider/types"
+)
+
+// RegisterInvariants registers all staking invariants
+func RegisterInvariants(ir sdk.InvariantRegistry, k *Keeper) {
+	ir.RegisterRoute(types.ModuleName, "max-provider-validators",
+		MaxProviderConsensusValidatorsInvariant(k))
+}
+
+// MaxProviderConsensusValidatorsInvariant checks that the number of provider consensus validators
+// is less than or equal to the maximum number of provider consensus validators
+func MaxProviderConsensusValidatorsInvariant(k *Keeper) sdk.Invariant {
+	return func(ctx sdk.Context) (string, bool) {
+		params := k.GetParams(ctx)
+		maxProviderConsensusValidators := params.MaxProviderConsensusValidators
+
+		consensusValidators := k.GetLastProviderConsensusValSet(ctx)
+		if int64(len(consensusValidators)) > maxProviderConsensusValidators {
+			return sdk.FormatInvariant(types.ModuleName, "max-provider-validators",
+				fmt.Sprintf("number of provider consensus validators: %d, exceeds max: %d",
+					len(consensusValidators), maxProviderConsensusValidators)), true
+		}
+
+		return "", false
+	}
+}

x/ccv/provider/module.go

@@ -23,6 +23,7 @@ import (
 	"github.com/cosmos/interchain-security/v5/x/ccv/provider/client/cli"
 	"github.com/cosmos/interchain-security/v5/x/ccv/provider/keeper"
 	"github.com/cosmos/interchain-security/v5/x/ccv/provider/migrations"
+	"github.com/cosmos/interchain-security/v5/x/ccv/provider/simulation"
 	providertypes "github.com/cosmos/interchain-security/v5/x/ccv/provider/types"
 )
 
@@ -115,8 +116,8 @@ func NewAppModule(k *keeper.Keeper, paramSpace paramtypes.Subspace) AppModule {
 }
 
 // RegisterInvariants implements the AppModule interface
-func (AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
-	// TODO
+func (am AppModule) RegisterInvariants(ir sdk.InvariantRegistry) {
+	keeper.RegisterInvariants(ir, am.keeper)
 }
 
 // RegisterServices registers module services.
@@ -191,6 +192,7 @@ func (am AppModule) EndBlock(ctx context.Context) ([]abci.ValidatorUpdate, error
 
 // GenerateGenesisState creates a randomized GenState of the transfer module.
 func (AppModule) GenerateGenesisState(simState *module.SimulationState) {
+	simulation.RandomizedGenState(simState)
 }
 
 // RegisterStoreDecoder registers a decoder for provider module's types

x/ccv/provider/simulation/genesis.go

@@ -0,0 +1,44 @@
+package simulation
+
+import (
+	"encoding/json"
+	"fmt"
+	"math/rand"
+
+	"github.com/cosmos/cosmos-sdk/types/module"
+	"github.com/cosmos/interchain-security/v5/x/ccv/provider/types"
+)
+
+// Simulation parameter constants
+const (
+	// only includes params that make sense even with a single
+	maxProviderConsensusValidators = "max_provider_consensus_validators"
+)
+
+// genMaxProviderConsensusValidators returns randomized maxProviderConsensusValidators
+func genMaxProviderConsensusValidators(r *rand.Rand) int64 {
+	return int64(r.Intn(250) + 1)
+}
+
+// RandomizedGenState generates a random GenesisState for staking
+func RandomizedGenState(simState *module.SimulationState) {
+	// params
+	var (
+		maxProviderConsensusVals int64
+	)
+
+	simState.AppParams.GetOrGenerate(maxProviderConsensusValidators, &maxProviderConsensusVals, simState.Rand, func(r *rand.Rand) { maxProviderConsensusVals = genMaxProviderConsensusValidators(r) })
+
+	providerParams := types.DefaultParams()
+	providerParams.MaxProviderConsensusValidators = maxProviderConsensusVals
+
+	providerGenesis := types.DefaultGenesisState()
+	providerGenesis.Params = providerParams
+
+	bz, err := json.MarshalIndent(&providerGenesis.Params, "", " ")
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("Selected randomly generated provider parameters:\n%s\n", bz)
+	simState.GenState[types.ModuleName] = simState.Cdc.MustMarshalJSON(providerGenesis)
+}