feat: Remove RandomizedParams from the AppModuleSimulation interface

CHANGELOG.md

@@ -45,6 +45,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
+* [#12846](https://github.com/cosmos/cosmos-sdk/pull/12846) Remove `RandomizedParams` from the `AppModuleSimulation` interface which is no longer needed.
 * (events) [#12850](https://github.com/cosmos/cosmos-sdk/pull/12850) Add a new `fee_payer` attribute to the `tx` event that is emitted from the `DeductFeeDecorator` AnteHandler decorator.
 * (ci) [#12854](https://github.com/cosmos/cosmos-sdk/pull/12854) Use ghcr.io to host the proto builder image.  Update proto builder image to go 1.19
 * (x/bank) [#12706](https://github.com/cosmos/cosmos-sdk/pull/12706) Added the `chain-id` flag to the `AddTxFlagsToCmd` API. There is no longer a need to explicitly register this flag on commands whens `AddTxFlagsToCmd` is already called.

UPGRADING.md

@@ -4,6 +4,10 @@ This guide provides instructions for upgrading to specific versions of Cosmos SD
 
 ## [Unreleased]
 
+### Simulation
+
+Remove `RandomizedParams` from `AppModuleSimulation` interface. Previously, it used to generate random parameter changes during simulations, however, it does so through ParamChangeProposal which is now legacy. Since all modules were migrated, we can now safely remove this from `AppModuleSimulation` interface.
+
 ### AppModule Interface
 
 Remove `Querier`, `Route` and `LegacyQuerier` from the app module interface. This removes and fully deprecates all legacy queriers. All modules no longer support the REST API previously known as the LCD, and the `sdk.Msg#Route` method won't be used anymore.

simapp/utils.go

@@ -67,7 +67,6 @@ func SimulationOperations(app App, cdc codec.JSONCodec, config simtypes.Config)
 		}
 	}
 
-	simState.ParamChanges = app.SimulationManager().GenerateParamChanges(config.Seed)
 	simState.Contents = app.SimulationManager().GetProposalContents(simState)
 	return app.SimulationManager().WeightedOperations(simState)
 }

types/module/simulation.go

@@ -21,9 +21,6 @@ type AppModuleSimulation interface {
 	// content functions used to simulate governance proposals
 	ProposalContents(simState SimulationState) []simulation.WeightedProposalContent
 
-	// randomized module parameters for param change proposals
-	RandomizedParams(r *rand.Rand) []simulation.ParamChange
-
 	// register a func to decode the each module's defined types from their corresponding store key
 	RegisterStoreDecoder(sdk.StoreDecoderRegistry)
 
@@ -106,18 +103,6 @@ func (sm *SimulationManager) GenerateGenesisStates(simState *SimulationState) {
 	}
 }
 
-// GenerateParamChanges generates randomized contents for creating params change
-// proposal transactions
-func (sm *SimulationManager) GenerateParamChanges(seed int64) (paramChanges []simulation.ParamChange) {
-	r := rand.New(rand.NewSource(seed))
-
-	for _, module := range sm.Modules {
-		paramChanges = append(paramChanges, module.RandomizedParams(r)...)
-	}
-
-	return
-}
-
 // WeightedOperations returns all the modules' weighted operations of an application
 func (sm *SimulationManager) WeightedOperations(simState SimulationState) []simulation.WeightedOperation {
 	wOps := make([]simulation.WeightedOperation, 0, len(sm.Modules))

x/auth/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 
 	modulev1 "cosmossdk.io/api/cosmos/auth/module/v1"
 	"cosmossdk.io/core/appmodule"
@@ -168,11 +167,6 @@ func (AppModule) ProposalContents(simState module.SimulationState) []simtypes.We
 	return nil
 }
 
-// RandomizedParams creates randomized auth param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return []simtypes.ParamChange{}
-}
-
 // RegisterStoreDecoder registers a decoder for auth module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.accountKeeper)

x/authz/module/module.go

@@ -3,7 +3,6 @@ package authz
 import (
 	"context"
 	"encoding/json"
-	"math/rand"
 
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
 	"github.com/spf13/cobra"
@@ -209,11 +208,6 @@ func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes
 	return nil
 }
 
-// RandomizedParams creates randomized authz param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return nil
-}
-
 // RegisterStoreDecoder registers a decoder for authz module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[keeper.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/bank/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 	"time"
 
 	modulev1 "cosmossdk.io/api/cosmos/bank/module/v1"
@@ -183,15 +182,6 @@ func (AppModule) ProposalContents(_ module.SimulationState) []simtypes.WeightedP
 	return nil
 }
 
-// RandomizedParams creates randomized distribution param changes for the simulator.
-
-// TODO: Returns an empty slice which will make parameter changes a no-op during
-// simulations. Once all modules are migrated, remove RandomizedParams from
-// the simulation interface.
-func (AppModule) RandomizedParams(_ *rand.Rand) []simtypes.ParamChange {
-	return []simtypes.ParamChange{}
-}
-
 // RegisterStoreDecoder registers a decoder for supply module's types
 func (am AppModule) RegisterStoreDecoder(_ sdk.StoreDecoderRegistry) {}
 

x/capability/module.go

@@ -3,7 +3,6 @@ package capability
 import (
 	"encoding/json"
 	"fmt"
-	"math/rand"
 	"time"
 
 	"cosmossdk.io/core/appmodule"
@@ -159,11 +158,6 @@ func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes
 	return nil
 }
 
-// RandomizedParams creates randomized capability param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return nil
-}
-
 // RegisterStoreDecoder registers a decoder for capability module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/distribution/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 
 	modulev1 "cosmossdk.io/api/cosmos/distribution/module/v1"
 	"cosmossdk.io/core/appmodule"
@@ -184,15 +183,6 @@ func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes
 	return simulation.ProposalContents(am.keeper)
 }
 
-// RandomizedParams creates randomized distribution param changes for the simulator.
-
-// TODO: Returns an empty slice which will make parameter changes a no-op during
-// simulations. Once all modules are migrated, remove RandomizedParams from
-// the simulation interface.
-func (AppModule) RandomizedParams(_ *rand.Rand) []simtypes.ParamChange {
-	return []simtypes.ParamChange{}
-}
-
 // RegisterStoreDecoder registers a decoder for distribution module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/evidence/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 
 	"cosmossdk.io/core/appmodule"
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
@@ -174,11 +173,6 @@ func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes
 	return nil
 }
 
-// RandomizedParams creates randomized evidence param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return nil
-}
-
 // RegisterStoreDecoder registers a decoder for evidence module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.keeper)

x/feegrant/module/module.go

@@ -3,7 +3,6 @@ package module
 import (
 	"context"
 	"encoding/json"
-	"math/rand"
 
 	"cosmossdk.io/core/appmodule"
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
@@ -215,11 +214,6 @@ func (AppModule) ProposalContents(simState module.SimulationState) []simtypes.We
 	return nil
 }
 
-// RandomizedParams creates randomized feegrant param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return nil
-}
-
 // RegisterStoreDecoder registers a decoder for feegrant module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[feegrant.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/gov/module.go

@@ -6,7 +6,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 	"sort"
 
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
@@ -334,13 +333,6 @@ func (AppModule) ProposalContents(simState module.SimulationState) []simtypes.We
 	return simulation.ProposalContents()
 }
 
-// TODO: Returns an empty slice which will make parameter changes a no-op during
-// simulations. Once all modules are migrated, remove RandomizedParams from
-// the simulation interface.
-func (AppModule) RandomizedParams(_ *rand.Rand) []simtypes.ParamChange {
-	return []simtypes.ParamChange{}
-}
-
 // RegisterStoreDecoder registers a decoder for gov module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/group/module/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 
 	"cosmossdk.io/core/appmodule"
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
@@ -206,11 +205,6 @@ func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes
 	return nil
 }
 
-// RandomizedParams creates randomized group param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return nil
-}
-
 // RegisterStoreDecoder registers a decoder for group module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[group.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/mint/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 
 	modulev1 "cosmossdk.io/api/cosmos/mint/module/v1"
 	"cosmossdk.io/core/appmodule"
@@ -187,15 +186,6 @@ func (AppModule) ProposalContents(simState module.SimulationState) []simtypes.We
 	return nil
 }
 
-// RandomizedParams creates randomized mint param changes for the simulator.
-//
-// TODO: Returns an empty slice which will make parameter changes a no-op during
-// simulations. Once all modules are migrated, remove RandomizedParams from
-// the simulation interface.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return []simtypes.ParamChange{}
-}
-
 // RegisterStoreDecoder registers a decoder for mint module's types.
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/nft/module/module.go

@@ -3,7 +3,6 @@ package module
 import (
 	"context"
 	"encoding/json"
-	"math/rand"
 
 	gwruntime "github.com/grpc-ecosystem/grpc-gateway/runtime"
 	"github.com/spf13/cobra"
@@ -159,11 +158,6 @@ func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes
 	return nil
 }
 
-// RandomizedParams creates randomized nft param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return nil
-}
-
 // RegisterStoreDecoder registers a decoder for nft module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[keeper.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/params/module.go

@@ -3,7 +3,6 @@ package params
 import (
 	"context"
 	"encoding/json"
-	"math/rand"
 
 	govv1beta1 "github.com/cosmos/cosmos-sdk/x/gov/types/v1beta1"
 
@@ -114,11 +113,6 @@ func (am AppModule) ProposalContents(simState module.SimulationState) []simtypes
 	return nil
 }
 
-// RandomizedParams creates randomized distribution param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return nil
-}
-
 // RegisterStoreDecoder doesn't register any type.
 func (AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {}
 

x/slashing/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 
 	modulev1 "cosmossdk.io/api/cosmos/slashing/module/v1"
 	"cosmossdk.io/core/appmodule"
@@ -179,11 +178,6 @@ func (AppModule) ProposalContents(simState module.SimulationState) []simtypes.We
 	return nil
 }
 
-// RandomizedParams creates randomized slashing param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return []simtypes.ParamChange{}
-}
-
 // RegisterStoreDecoder registers a decoder for slashing module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.cdc)

x/staking/module.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"fmt"
-	"math/rand"
 	"sort"
 
 	authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
@@ -288,11 +287,6 @@ func (AppModule) ProposalContents(simState module.SimulationState) []simtypes.We
 	return nil
 }
 
-// RandomizedParams creates randomized staking param changes for the simulator.
-func (AppModule) RandomizedParams(r *rand.Rand) []simtypes.ParamChange {
-	return []simtypes.ParamChange{}
-}
-
 // RegisterStoreDecoder registers a decoder for staking module's types
 func (am AppModule) RegisterStoreDecoder(sdr sdk.StoreDecoderRegistry) {
 	sdr[types.StoreKey] = simulation.NewDecodeStore(am.cdc)