Add fee grant module (cosmos#8061)

* Add docs

* Add BasicFeeAllowance implementation

* Add expiration structs and complete basic fee

* Add delegation messages, add validation logic

* Add keeper and helper structs

* Add alias and handler to top level

* Add delegation module

* Add basic querier

* Add types tests

* Add types tests

* More internal test coverage

* Solid internal test coverage

* Expose Querier to top level module

* Add FeeAccount to auth/types, like StdTx, SignDoc

* Fix all tests in x/auth

* All tests pass

* Appease the Golang Linter

* Add fee-account command line flag

* Start on DelegatedDeductFeeDecorator

* Cleanup the Decorator

* Wire up delegation module in simapp

* add basic test for decorator (no delegation)

* Table tests for deduct fees

* Table tests over all conditions of delegated fee decorator

* Build full ante handler stack and test it

* Start genesis

* Implement Genesis

* Rename package delegation to subkeys

* Clarify antes test cases, handle empty account w/o fees

* Allow paying delegated fees with no account

* Pull mempool into delegated ante, for control on StdFee

* Use custom DelegatedTx, DelegatedFee for subkeys

* Revert all changes to x/auth.StdTx

* Appease scopelint

* Register DelegatedTx with codec

* Address PR comments

* Remove unnecessary DelegatedMempoolFeeDecorator

* Cleaned up errors in querier

* Clean up message sign bytes

* Minor PR comments

* Replace GetAllFees... with Iterator variants

* PrepareForExport adjusts grant expiration height

* Panic on de/serialization error in keeper

* Move custom ante handler chain to tests, update docs

* More cleanup

* More doc cleanup

* Renamed subkeys module to fee_grant

* Rename subkeys/delegation to fee grant in all strings

* Modify Msg and Keeper methods to use Grant not Delegate

* Add PeriodicFeeAllowance

* Update aliases

* Cover all accept cases for PeriodicFeeAllowance

* Et tu scopelint?

* Update docs as requested

* Remove error return from GetFeeGrant

* Code cleanup as requested by PR

* Updated all errors to use new sdk/errors package

* Use test suite for keeper tests

* Clean up alias.go file

* Define expected interfaces in exported, rather than importing from account

* Remove dependency on auth/ante

* Improve godoc, Logger

* Cleaned up ExpiresAt

* Improve error reporting with UseGrantedFee

* Enforce period limit subset of basic limit

* Add events

* Rename fee_grant to feegrant

* Ensure KeeperTestSuite actually runs

* Move types/tx to types

* Update alias file, include ante

* I do need nolint in alias.go

* Properly emit events in the handler. Use cosmos-sdk in amino types

* Update godoc

* Linting...

* Update errors

* Update pkg doc and fix ante-handler order

* Merge PR cosmos#5782: Migrate x/feegrant to proto

* fix errors

* proto changes

* proto changes

* fix errors

* fix errors

* genesis state changed to proto

* fix keeper tests

* fix test

* fixed tests

* fix tests

* updated expected keepers

* updated ante tests

* lint

* deleted alias.go

* tx updated to proto tx

* remove explicit signmode

* tests

* Added `cli/query.go`

* Added tx.go in cli

* updated `module.go`

* resolve errors in tx.go

* Add fee payer gentx func

* updated tx

* fixed error

* WIP: cli tests

* fix query error

* fix tests

* Unused types and funcs

* fix tests

* rename helper func to create tx

* remove unused

* update tx cfg

* fix cli tests

* added simulations

* Add `decoder.go`

* fix build fail

* added init genesis code

* update tx.go

* fixed LGTM alert

* modified cli

* remove gogoproto extensions

* change acc address type to string

* lint

* fix simulations

* Add gen simulations

* remove legacy querier

* remove legacy code

* add grpc queries tests

* fix simulations

* update module.go

* lint

* register feegrant NewSimulationManager

* fix sims

* fix sims

* add genesis test

* add periodic grant

* updated cmd

* changed times

* updated flags

* removed days as period clock

* added condition for period and exp

* add periodic fee cli tests

* udpated tests

* fix lint

* fix tests

* fix sims

* renaming to `fee_grant`

* review changes

* fix test

* add condition for duplicate grants

* fix tests

* add `genTxWithFeeGranter` in tests

* fix simulation

* one of changes & test fixes

* fix test

* fix lint

* changed package name `feegrant` to `fee_grant`

* review comments

* review changes

* review change

* review changes

* added fee-account in flags

* address review changes

* read fee granter from cli

* updated create account with mnemonic

* Address review comments

* move `simapp/ante` file to `feegrant/ante`

* update keeper logic to create account

* update docs

* fix tests

* update `serviceMsgClientConn` from `msgservice`

* review changes

* add test case for using more fees than allowed

* eliminate panic checks from keeper

* fix lint

* change store keys string to bytes

* fix tests

* review changes

* review changes

* udpate docs

* make spend limit optional

* fix tests

* fix tests

* review changes

* add norace tag

* proto-docs

* add docs

Co-authored-by: Ethan Frey <ethanfrey@users.noreply.github.com>
Co-authored-by: Alexander Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: Aleksandr Bezobchuk <aleks.bezobchuk@gmail.com>
Co-authored-by: SaReN <sahithnarahari@gmail.com>
Co-authored-by: aleem1413 <aleem@vitwit.com>
Co-authored-by: MD Aleem <72057206+aleem1314@users.noreply.github.com>
Co-authored-by: Anil Kumar Kammari <anil@vitwit.com>
Co-authored-by: mergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

app.go

@@ -55,6 +55,10 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/evidence"
 	evidencekeeper "github.com/cosmos/cosmos-sdk/x/evidence/keeper"
 	evidencetypes "github.com/cosmos/cosmos-sdk/x/evidence/types"
+	feegrant "github.com/cosmos/cosmos-sdk/x/feegrant"
+	feegrantante "github.com/cosmos/cosmos-sdk/x/feegrant/ante"
+	feegrantkeeper "github.com/cosmos/cosmos-sdk/x/feegrant/keeper"
+	feegranttypes "github.com/cosmos/cosmos-sdk/x/feegrant/types"
 	"github.com/cosmos/cosmos-sdk/x/genutil"
 	genutiltypes "github.com/cosmos/cosmos-sdk/x/genutil/types"
 	"github.com/cosmos/cosmos-sdk/x/gov"
@@ -120,6 +124,7 @@ var (
 		crisis.AppModuleBasic{},
 		slashing.AppModuleBasic{},
 		ibc.AppModuleBasic{},
+		feegrant.AppModuleBasic{},
 		upgrade.AppModuleBasic{},
 		evidence.AppModuleBasic{},
 		transfer.AppModuleBasic{},
@@ -181,6 +186,7 @@ type SimApp struct {
 	IBCKeeper        *ibckeeper.Keeper // IBC Keeper must be a pointer in the app, so we can SetRouter on it correctly
 	EvidenceKeeper   evidencekeeper.Keeper
 	TransferKeeper   ibctransferkeeper.Keeper
+	FeeGrantKeeper   feegrantkeeper.Keeper
 
 	// make scoped keepers public for test purposes
 	ScopedIBCKeeper      capabilitykeeper.ScopedKeeper
@@ -222,7 +228,7 @@ func NewSimApp(
 	keys := sdk.NewKVStoreKeys(
 		authtypes.StoreKey, banktypes.StoreKey, stakingtypes.StoreKey,
 		minttypes.StoreKey, distrtypes.StoreKey, slashingtypes.StoreKey,
-		govtypes.StoreKey, paramstypes.StoreKey, ibchost.StoreKey, upgradetypes.StoreKey,
+		govtypes.StoreKey, paramstypes.StoreKey, ibchost.StoreKey, upgradetypes.StoreKey, feegranttypes.StoreKey,
 		evidencetypes.StoreKey, ibctransfertypes.StoreKey, capabilitytypes.StoreKey,
 		authztypes.StoreKey,
 	)
@@ -277,6 +283,8 @@ func NewSimApp(
 	app.CrisisKeeper = crisiskeeper.NewKeeper(
 		app.GetSubspace(crisistypes.ModuleName), invCheckPeriod, app.BankKeeper, authtypes.FeeCollectorName,
 	)
+
+	app.FeeGrantKeeper = feegrantkeeper.NewKeeper(appCodec, keys[feegranttypes.StoreKey], app.AccountKeeper)
 	app.UpgradeKeeper = upgradekeeper.NewKeeper(skipUpgradeHeights, keys[upgradetypes.StoreKey], appCodec, homePath)
 
 	// register the staking hooks
@@ -347,6 +355,7 @@ func NewSimApp(
 		bank.NewAppModule(appCodec, app.BankKeeper, app.AccountKeeper),
 		capability.NewAppModule(appCodec, *app.CapabilityKeeper),
 		crisis.NewAppModule(&app.CrisisKeeper, skipGenesisInvariants),
+		feegrant.NewAppModule(appCodec, app.AccountKeeper, app.BankKeeper, app.FeeGrantKeeper, app.interfaceRegistry),
 		gov.NewAppModule(appCodec, app.GovKeeper, app.AccountKeeper, app.BankKeeper),
 		mint.NewAppModule(appCodec, app.MintKeeper, app.AccountKeeper),
 		slashing.NewAppModule(appCodec, app.SlashingKeeper, app.AccountKeeper, app.BankKeeper, app.StakingKeeper),
@@ -379,6 +388,7 @@ func NewSimApp(
 		capabilitytypes.ModuleName, authtypes.ModuleName, banktypes.ModuleName, distrtypes.ModuleName, stakingtypes.ModuleName,
 		slashingtypes.ModuleName, govtypes.ModuleName, minttypes.ModuleName, crisistypes.ModuleName,
 		ibchost.ModuleName, genutiltypes.ModuleName, evidencetypes.ModuleName, authztypes.ModuleName, ibctransfertypes.ModuleName,
+		feegranttypes.ModuleName,
 	)
 
 	app.mm.RegisterInvariants(&app.CrisisKeeper)
@@ -396,6 +406,7 @@ func NewSimApp(
 		auth.NewAppModule(appCodec, app.AccountKeeper, authsims.RandomGenesisAccounts),
 		bank.NewAppModule(appCodec, app.BankKeeper, app.AccountKeeper),
 		capability.NewAppModule(appCodec, *app.CapabilityKeeper),
+		feegrant.NewAppModule(appCodec, app.AccountKeeper, app.BankKeeper, app.FeeGrantKeeper, app.interfaceRegistry),
 		gov.NewAppModule(appCodec, app.GovKeeper, app.AccountKeeper, app.BankKeeper),
 		mint.NewAppModule(appCodec, app.MintKeeper, app.AccountKeeper),
 		staking.NewAppModule(appCodec, app.StakingKeeper, app.AccountKeeper, app.BankKeeper),
@@ -419,8 +430,8 @@ func NewSimApp(
 	app.SetInitChainer(app.InitChainer)
 	app.SetBeginBlocker(app.BeginBlocker)
 	app.SetAnteHandler(
-		ante.NewAnteHandler(
-			app.AccountKeeper, app.BankKeeper, ante.DefaultSigVerificationGasConsumer,
+		feegrantante.NewAnteHandler(
+			app.AccountKeeper, app.BankKeeper, app.FeeGrantKeeper, ante.DefaultSigVerificationGasConsumer,
 			encodingConfig.TxConfig.SignModeHandler(),
 		),
 	)

params/weights.go

@@ -20,4 +20,8 @@ const (
 	DefaultWeightCommunitySpendProposal int = 5
 	DefaultWeightTextProposal           int = 5
 	DefaultWeightParamChangeProposal    int = 5
+
+	// feegrant
+	DefaultWeightGrantFeeAllowance  int = 100
+	DefaultWeightRevokeFeeAllowance int = 100
 )