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feat: Allow to restrict MintCoins from app.go (#10771)
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## Description

Closes: #10386

This PR adds feature to the bank module so that other modules using bankKeeper would be able to call the keeper with restricted permissions when minting coins. `WithMintCoinsRestriction` would be able to get called within app.go when setting keeper components for each individual keeper, taking a function that would validate minting denom as an argument.

The example below demonstrates adding bank module with restricted permissions.
```
	app.DistrKeeper = distrkeeper.NewKeeper(
		appCodec, keys[distrtypes.StoreKey], app.GetSubspace(distrtypes.ModuleName), app.AccountKeeper, app.BankKeeper.WithMintCoinsRestriction(DistributionMintingRestriction),
		&stakingKeeper, authtypes.FeeCollectorName, app.ModuleAccountAddrs(),
	)
```
while there would be a seperate function that would restrict and validate allowed denoms as such.

```

func DistributionMintingRestriction(ctx sdk.Context, coins sdk.Coins) errors {
  for _, coin := range coins {
    if coin.Denom != ctx.NativeStakingDenom {
       return errors.New(fmt.Sprintf("Distribution can only print denom %s, tried minting %s", ctx.NativeStakingDenom, coin.Denom))
     }
  }
}
```

The sdk's simapp currently does not have any keepers that are to be changed with this implementation added, thus remaining unchanged in `app.go`.

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [ ] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [ ] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [ ] provided a link to the relevant issue or specification
- [ ] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [ ] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [ ] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [ ] reviewed state machine logic
- [ ] reviewed API design and naming
- [ ] reviewed documentation is accurate
- [ ] reviewed tests and test coverage
- [ ] manually tested (if applicable)

(cherry picked from commit ea67659)

# Conflicts:
#	CHANGELOG.md
#	x/bank/keeper/keeper.go
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mattverse authored and mergify-bot committed Feb 18, 2022
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136 changes: 136 additions & 0 deletions CHANGELOG.md
Original file line number Diff line number Diff line change
Expand Up @@ -37,6 +37,142 @@ Ref: https://keepachangelog.com/en/1.0.0/

## [Unreleased]

<<<<<<< HEAD
=======
### Features

* [\#10977](https://github.com/cosmos/cosmos-sdk/pull/10977) Now every cosmos message protobuf definition must be extended with a ``cosmos.msg.v1.signer`` option to signal the signer fields in a language agnostic way.
* [\#10710](https://github.com/cosmos/cosmos-sdk/pull/10710) Chain-id shouldn't be required for creating a transaction with both --generate-only and --offline flags.
* [\#10703](https://github.com/cosmos/cosmos-sdk/pull/10703) Create a new grantee account, if the grantee of an authorization does not exist.
* [\#10592](https://github.com/cosmos/cosmos-sdk/pull/10592) Add a `DecApproxEq` function that checks to see if `|d1 - d2| < tol` for some Dec `d1, d2, tol`.
* [\#9933](https://github.com/cosmos/cosmos-sdk/pull/9933) Introduces the notion of a Cosmos "Scalar" type, which would just be simple aliases that give human-understandable meaning to the underlying type, both in Go code and in Proto definitions.
* [\#9884](https://github.com/cosmos/cosmos-sdk/pull/9884) Provide a new gRPC query handler, `/cosmos/params/v1beta1/subspaces`, that allows the ability to query for all registered subspaces and their respective keys.
* [\#9776](https://github.com/cosmos/cosmos-sdk/pull/9776) Add flag `staking-bond-denom` to specify the staking bond denomination value when initializing a new chain.
* [\#9533](https://github.com/cosmos/cosmos-sdk/pull/9533) Added a new gRPC method, `DenomOwners`, in `x/bank` to query for all account holders of a specific denomination.
* (bank) [\#9618](https://github.com/cosmos/cosmos-sdk/pull/9618) Update bank.Metadata: add URI and URIHash attributes.
* (store) [\#8664](https://github.com/cosmos/cosmos-sdk/pull/8664) Implementation of ADR-038 file StreamingService
* [\#9837](https://github.com/cosmos/cosmos-sdk/issues/9837) `--generate-only` flag will accept the keyname now.
* [\#10326](https://github.com/cosmos/cosmos-sdk/pull/10326) `x/authz` add all grants by granter query.
* [\#10944](https://github.com/cosmos/cosmos-sdk/pull/10944) `x/authz` add all grants by grantee query
* [\#10348](https://github.com/cosmos/cosmos-sdk/pull/10348) Add `fee.{payer,granter}` and `tip` fields to StdSignDoc for signing tipped transactions.
* [\#10208](https://github.com/cosmos/cosmos-sdk/pull/10208) Add `TipsTxMiddleware` for transferring tips.
* [\#10379](https://github.com/cosmos/cosmos-sdk/pull/10379) Add validation to `x/upgrade` CLI `software-upgrade` command `--plan-info` value.
* [\#10507](https://github.com/cosmos/cosmos-sdk/pull/10507) Add middleware for tx priority.
* [\#10311](https://github.com/cosmos/cosmos-sdk/pull/10311) Adds cli to use tips transactions. It adds an `--aux` flag to all CLI tx commands to generate the aux signer data (with optional tip), and a new `tx aux-to-fee` subcommand to let the fee payer gather aux signer data and broadcast the tx
* [\#10430](https://github.com/cosmos/cosmos-sdk/pull/10430) ADR-040: Add store/v2 `MultiStore` implementation
* [\#11019](https://github.com/cosmos/cosmos-sdk/pull/11019) Add `MsgCreatePermanentLockedAccount` and CLI method for creating permanent locked account
* [\#10947](https://github.com/cosmos/cosmos-sdk/pull/10947) Add `AllowancesByGranter` query to the feegrant module
* [\#10407](https://github.com/cosmos/cosmos-sdk/pull/10407) Add validation to `x/upgrade` module's `BeginBlock` to check accidental binary downgrades
* (gov) [\#11036](https://github.com/cosmos/cosmos-sdk/pull/11036) Add in-place migrations for 0.43->0.46. Add a `migrate v0.46` CLI command for v0.43->0.46 JSON genesis migration.
* [\#11006](https://github.com/cosmos/cosmos-sdk/pull/11006) Add `debug pubkey-raw` command to allow inspecting of pubkeys in legacy bech32 format
* (x/authz) [\#10714](https://github.com/cosmos/cosmos-sdk/pull/10714) Add support for pruning expired authorizations

### API Breaking Changes

* (store)[\#11152](https://github.com/cosmos/cosmos-sdk/pull/11152) Remove `keep-every` from pruning options.
* [\#10950](https://github.com/cosmos/cosmos-sdk/pull/10950) Add `envPrefix` parameter to `cmd.Execute`.
* (x/mint) [\#10441](https://github.com/cosmos/cosmos-sdk/pull/10441) The `NewAppModule` function now accepts an inflation calculation function as an argument.
* [\#10295](https://github.com/cosmos/cosmos-sdk/pull/10295) Remove store type aliases from /types
* [\#9695](https://github.com/cosmos/cosmos-sdk/pull/9695) Migrate keys from `Info` -> `Record`
* Add new `codec.Codec` argument in:
* `keyring.NewInMemory`
* `keyring.New`
* Rename:
* `SavePubKey` to `SaveOfflineKey`.
* `NewMultiInfo`, `NewLedgerInfo` to `NewLegacyMultiInfo`, `newLegacyLedgerInfo` respectively. Move them into `legacy_info.go`.
* `NewOfflineInfo` to `newLegacyOfflineInfo` and move it to `migration_test.go`.
* Return:
*`keyring.Record, error` in `SaveOfflineKey`, `SaveLedgerKey`, `SaveMultiSig`, `Key` and `KeyByAddress`.
*`keyring.Record` instead of `Info` in `NewMnemonic` and `List`.
* Remove `algo` argument from :
* `SaveOfflineKey`
* Take `keyring.Record` instead of `Info` as first argument in:
* `MkConsKeyOutput`
* `MkValKeyOutput`
* `MkAccKeyOutput`
* [\#10022](https://github.com/cosmos/cosmos-sdk/pull/10022) `AuthKeeper` interface in `x/auth` now includes a function `HasAccount`.
* [\#9759](https://github.com/cosmos/cosmos-sdk/pull/9759) `NewAccountKeeeper` in `x/auth` now takes an additional `bech32Prefix` argument that represents `sdk.Bech32MainPrefix`.
* [\#9628](https://github.com/cosmos/cosmos-sdk/pull/9628) Rename `x/{mod}/legacy` to `x/{mod}/migrations`.
* [\#9571](https://github.com/cosmos/cosmos-sdk/pull/9571) Implemented error handling for staking hooks, which now return an error on failure.
* [\#9427](https://github.com/cosmos/cosmos-sdk/pull/9427) Move simapp `FundAccount` and `FundModuleAccount` to `x/bank/testutil`
* (client/tx) [\#9421](https://github.com/cosmos/cosmos-sdk/pull/9421/) `BuildUnsignedTx`, `BuildSimTx`, `PrintUnsignedStdTx` functions are moved to
the Tx Factory as methods.
* (client/keys) [\#9407](https://github.com/cosmos/cosmos-sdk/pull/9601) Added `keys rename` CLI command and `Keyring.Rename` interface method to rename a key in the keyring.
* (x/slashing) [\#9458](https://github.com/cosmos/cosmos-sdk/pull/9458) Coins burned from slashing is now returned from Slash function and included in Slash event.
* [\#9246](https://github.com/cosmos/cosmos-sdk/pull/9246) The `New` method for the network package now returns an error.
* [\#9519](https://github.com/cosmos/cosmos-sdk/pull/9519) `DeleteDeposits` renamed to `DeleteAndBurnDeposits`, `RefundDeposits` renamed to `RefundAndDeleteDeposits`
* (codec) [\#9521](https://github.com/cosmos/cosmos-sdk/pull/9521) Removed deprecated `clientCtx.JSONCodec` from `client.Context`.
* (codec) [\#9521](https://github.com/cosmos/cosmos-sdk/pull/9521) Rename `EncodingConfig.Marshaler` to `Codec`.
* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) `RESTHandlerFn` argument is removed from the `gov/NewProposalHandler`.
* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) `types/rest` package moved to `testutil/rest`.
* [\#9432](https://github.com/cosmos/cosmos-sdk/pull/9432) `ConsensusParamsKeyTable` moved from `params/keeper` to `params/types`
* [\#9576](https://github.com/cosmos/cosmos-sdk/pull/9576) Add debug error message to `sdkerrors.QueryResult` when enabled
* [\#9650](https://github.com/cosmos/cosmos-sdk/pull/9650) Removed deprecated message handler implementation from the SDK modules.
* [\#10248](https://github.com/cosmos/cosmos-sdk/pull/10248) Remove unused `KeyPowerReduction` variable from x/staking types.
* (x/bank) [\#9832](https://github.com/cosmos/cosmos-sdk/pull/9832) `AddressFromBalancesStore` renamed to `AddressAndDenomFromBalancesStore`.
* (tests) [\#9938](https://github.com/cosmos/cosmos-sdk/pull/9938) `simapp.Setup` accepts additional `testing.T` argument.
* (baseapp) [\#9920](https://github.com/cosmos/cosmos-sdk/pull/9920) BaseApp `{Check,Deliver,Simulate}Tx` methods are now replaced by a middleware stack.
* Replace the Antehandler interface with the `tx.Handler` and `tx.Middleware` interfaces.
* Replace `baseapp.SetAnteHandler` with `baseapp.SetTxHandler`.
* Move Msg routers from BaseApp to middlewares.
* Move Baseapp panic recovery into a middleware.
* Rename simulation helper methods `baseapp.{Check,Deliver}` to `baseapp.Sim{Check,Deliver}**`.
* (x/gov) [\#10373](https://github.com/cosmos/cosmos-sdk/pull/10373) Removed gov `keeper.{MustMarshal, MustUnmarshal}`.
* [\#10348](https://github.com/cosmos/cosmos-sdk/pull/10348) StdSignBytes takes a new argument of type `*tx.Tip` for signing over tips using LEGACY_AMINO_JSON.
* [\#10208](https://github.com/cosmos/cosmos-sdk/pull/10208) The `x/auth/signing.Tx` interface now also includes a new `GetTip() *tx.Tip` method for verifying tipped transactions. The `x/auth/types` expected BankKeeper interface now expects the `SendCoins` method too.
* [\#10612](https://github.com/cosmos/cosmos-sdk/pull/10612) `baseapp.NewBaseApp` constructor function doesn't take the `sdk.TxDecoder` anymore. This logic has been moved into the TxDecoderMiddleware.
* [\#10692](https://github.com/cosmos/cosmos-sdk/pull/10612) `SignerData` takes 2 new fields, `Address` and `PubKey`, which need to get populated when using SIGN_MODE_DIRECT_AUX.
* [\#10748](https://github.com/cosmos/cosmos-sdk/pull/10748) Move legacy `x/gov` api to `v1beta1` directory.
* [\#10816](https://github.com/cosmos/cosmos-sdk/pull/10816) Reuse blocked addresses from the bank module. No need to pass them to distribution.
* [\#10852](https://github.com/cosmos/cosmos-sdk/pull/10852) Move `x/gov/types` to `x/gov/types/v1beta2`.
* [\#10922](https://github.com/cosmos/cosmos-sdk/pull/10922), [/#10957](https://github.com/cosmos/cosmos-sdk/pull/10957) Move key `server.Generate*` functions to testutil and support custom mnemonics in in-process testing network. Moved `TestMnemonic` from `testutil` package to `testdata`.
* (x/bank) [\#10771](https://github.com/cosmos/cosmos-sdk/pull/10771) Add safety check on bank module perms to allow module-specific mint restrictions (e.g. only minting a certain denom).* (x/bank) [\#10771](https://github.com/cosmos/cosmos-sdk/pull/10771) Add `bank.BaseKeeper.WithMintCoinsRestriction` function to restrict use of bank `MintCoins` usage.
* [\#10868](https://github.com/cosmos/cosmos-sdk/pull/10868), [\#10989](https://github.com/cosmos/cosmos-sdk/pull/10989) The Gov keeper accepts now 2 more mandatory arguments, the ServiceMsgRouter and a maximum proposal metadata length.
* [\#10868](https://github.com/cosmos/cosmos-sdk/pull/10868), [\#10989](https://github.com/cosmos/cosmos-sdk/pull/10989), [\#11093](https://github.com/cosmos/cosmos-sdk/pull/11093) The Gov keeper accepts now 2 more mandatory arguments, the ServiceMsgRouter and a gov Config including the max metadata length.
* [\#11124](https://github.com/cosmos/cosmos-sdk/pull/11124) Add `GetAllVersions` to application store
* (x/authz) [\#10447](https://github.com/cosmos/cosmos-sdk/pull/10447) authz `NewGrant` takes a new argument: block time, to correctly validate expire time.


### Client Breaking Changes

* [\#11089](https://github.com/cosmos/cosmos-sdk/pull/11089]) interacting with the node through `grpc.Dial` requires clients to pass a codec refer to [doc](docs/run-node/interact-node.md).
* [\#9594](https://github.com/cosmos/cosmos-sdk/pull/9594) Remove legacy REST API. Please see the [REST Endpoints Migration guide](https://docs.cosmos.network/master/migrations/rest.html) to migrate to the new REST endpoints.
* [\#9995](https://github.com/cosmos/cosmos-sdk/pull/9995) Increased gas cost for creating proposals.
* [\#11029](https://github.com/cosmos/cosmos-sdk/pull/11029) The deprecated Vote Option field is removed in gov v1beta2 and nil in v1beta1. Use Options instead.
* [\#11013](https://github.com/cosmos/cosmos-sdk/pull/) The `tx gov submit-proposal` command has changed syntax to support the new Msg-based gov proposals. To access the old CLI command, please use `tx gov submit-legacy-proposal`.
* [\#11170](https://github.com/cosmos/cosmos-sdk/issues/11170) Fixes issue related to grpc-gateway of supply by ibc-denom.

### CLI Breaking Changes

* [\#9695](https://github.com/cosmos/cosmos-sdk/pull/9695) `<app> keys migrate` CLI command now takes no arguments
* [\#9246](https://github.com/cosmos/cosmos-sdk/pull/9246) Removed the CLI flag `--setup-config-only` from the `testnet` command and added the subcommand `init-files`.
* [\#9780](https://github.com/cosmos/cosmos-sdk/pull/9780) Use sigs.k8s.io for yaml, which might lead to minor YAML output changes
* [\#10625](https://github.com/cosmos/cosmos-sdk/pull/10625) Rename `--fee-account` CLI flag to `--fee-granter`
* [\#10684](https://github.com/cosmos/cosmos-sdk/pull/10684) Rename `edit-validator` command's `--moniker` flag to `--new-moniker`

### Improvements

* [\#11089](https://github.com/cosmos/cosmos-sdk/pull/11089]) Now cosmos-sdk consumers can upgrade gRPC to its newest versions.
* [\#10439](https://github.com/cosmos/cosmos-sdk/pull/10439) Check error for `RegisterQueryHandlerClient` in all modules `RegisterGRPCGatewayRoutes`.
* [\#9780](https://github.com/cosmos/cosmos-sdk/pull/9780) Remove gogoproto `moretags` YAML annotations and add `sigs.k8s.io/yaml` for YAML marshalling.
* (x/bank) [\#10134](https://github.com/cosmos/cosmos-sdk/pull/10134) Add `HasDenomMetadata` function to bank `Keeper` to check if a client coin denom metadata exists in state.
* (x/bank) [\#10022](https://github.com/cosmos/cosmos-sdk/pull/10022) `BankKeeper.SendCoins` now takes less execution time.
* (deps) [\#9987](https://github.com/cosmos/cosmos-sdk/pull/9987) Bump Go version minimum requirement to `1.17`
* (cli) [\#9856](https://github.com/cosmos/cosmos-sdk/pull/9856) Overwrite `--sequence` and `--account-number` flags with default flag values when used with `offline=false` in `sign-batch` command.
* (rosetta) [\#10001](https://github.com/cosmos/cosmos-sdk/issues/10001) Add documentation for rosetta-cli dockerfile and rename folder for the rosetta-ci dockerfile
* [\#9699](https://github.com/cosmos/cosmos-sdk/pull/9699) Add `:`, `.`, `-`, and `_` as allowed characters in the default denom regular expression.
* (genesis) [\#9697](https://github.com/cosmos/cosmos-sdk/pull/9697) Ensure `InitGenesis` returns with non-empty validator set.
* [\#10341](https://github.com/cosmos/cosmos-sdk/pull/10341) Move from `io/ioutil` to `io` and `os` packages.
* [\#10468](https://github.com/cosmos/cosmos-sdk/pull/10468) Allow futureOps to queue additional operations in simulations
* [\#10625](https://github.com/cosmos/cosmos-sdk/pull/10625) Add `--fee-payer` CLI flag
* (cli) [\#10683](https://github.com/cosmos/cosmos-sdk/pull/10683) In CLI, allow 1 SIGN_MODE_DIRECT signer in transactions with multiple signers.
* (deps) [\#10210](https://github.com/cosmos/cosmos-sdk/pull/10210) Bump Tendermint to [v0.35.0](https://github.com/tendermint/tendermint/releases/tag/v0.35.0).
* (deps) [\#10706](https://github.com/cosmos/cosmos-sdk/issues/10706) Bump rosetta-sdk-go to v0.7.2 and rosetta-cli to v0.7.3
* (types/errors) [\#10779](https://github.com/cosmos/cosmos-sdk/pull/10779) Move most functionality in `types/errors` to a standalone `errors` go module, except the `RootCodespace` errors and ABCI response helpers. All functions and types that used to live in `types/errors` are now aliased so this is not a breaking change.
* (gov) [\#10854](https://github.com/cosmos/cosmos-sdk/pull/10854) v1beta2's vote doesn't include the deprecate `option VoteOption` anymore. Instead, it only uses `WeightedVoteOption`.
* (types) [\#11004](https://github.com/cosmos/cosmos-sdk/pull/11004) Added mutable versions of many of the sdk.Dec types operations. This improves performance when used by avoiding reallocating a new bigint for each operation.

>>>>>>> ea6765995 (feat: Allow to restrict MintCoins from app.go (#10771))
### Bug Fixes

* (store) [\#11117](https://github.com/cosmos/cosmos-sdk/pull/11117) Fix data race in store trace component
Expand Down
49 changes: 43 additions & 6 deletions x/bank/keeper/keeper.go
Original file line number Diff line number Diff line change
Expand Up @@ -20,6 +20,7 @@ var _ Keeper = (*BaseKeeper)(nil)
// between accounts.
type Keeper interface {
SendKeeper
WithMintCoinsRestriction(MintingRestrictionFn) BaseKeeper

InitGenesis(sdk.Context, *types.GenesisState)
ExportGenesis(sdk.Context) *types.GenesisState
Expand Down Expand Up @@ -49,12 +50,22 @@ type Keeper interface {
type BaseKeeper struct {
BaseSendKeeper

<<<<<<< HEAD
ak types.AccountKeeper
cdc codec.BinaryCodec
storeKey sdk.StoreKey
paramSpace paramtypes.Subspace
=======
ak types.AccountKeeper
cdc codec.BinaryCodec
storeKey storetypes.StoreKey
paramSpace paramtypes.Subspace
mintCoinsRestrictionFn MintingRestrictionFn
>>>>>>> ea6765995 (feat: Allow to restrict MintCoins from app.go (#10771))
}

type MintingRestrictionFn func(ctx sdk.Context, coins sdk.Coins) error

// GetPaginatedTotalSupply queries for the supply, ignoring 0 coins, with a given pagination
func (k BaseKeeper) GetPaginatedTotalSupply(ctx sdk.Context, pagination *query.PageRequest) (sdk.Coins, *query.PageResponse, error) {
store := ctx.KVStore(k.storeKey)
Expand Down Expand Up @@ -101,12 +112,33 @@ func NewBaseKeeper(
}

return BaseKeeper{
BaseSendKeeper: NewBaseSendKeeper(cdc, storeKey, ak, paramSpace, blockedAddrs),
ak: ak,
cdc: cdc,
storeKey: storeKey,
paramSpace: paramSpace,
BaseSendKeeper: NewBaseSendKeeper(cdc, storeKey, ak, paramSpace, blockedAddrs),
ak: ak,
cdc: cdc,
storeKey: storeKey,
paramSpace: paramSpace,
mintCoinsRestrictionFn: func(ctx sdk.Context, coins sdk.Coins) error { return nil },
}
}

// WithMintCoinsRestriction restricts the bank Keeper used within a specific module to
// have restricted permissions on minting via function passed in parameter.
// Previous restriction functions can be nested as such:
// bankKeeper.WithMintCoinsRestriction(restriction1).WithMintCoinsRestriction(restriction2)
func (k BaseKeeper) WithMintCoinsRestriction(check MintingRestrictionFn) BaseKeeper {
oldRestrictionFn := k.mintCoinsRestrictionFn
k.mintCoinsRestrictionFn = func(ctx sdk.Context, coins sdk.Coins) error {
err := check(ctx, coins)
if err != nil {
return err
}
err = oldRestrictionFn(ctx, coins)
if err != nil {
return err
}
return nil
}
return k
}

// DelegateCoins performs delegation by deducting amt coins from an account with
Expand Down Expand Up @@ -364,6 +396,11 @@ func (k BaseKeeper) UndelegateCoinsFromModuleToAccount(
// MintCoins creates new coins from thin air and adds it to the module account.
// It will panic if the module account does not exist or is unauthorized.
func (k BaseKeeper) MintCoins(ctx sdk.Context, moduleName string, amounts sdk.Coins) error {
err := k.mintCoinsRestrictionFn(ctx, amounts)
if err != nil {
ctx.Logger().Error(fmt.Sprintf("Module %q attempted to mint coins %s it doesn't have permission for, error %v", moduleName, amounts, err))
return err
}
acc := k.ak.GetModuleAccount(ctx, moduleName)
if acc == nil {
panic(sdkerrors.Wrapf(sdkerrors.ErrUnknownAddress, "module account %s does not exist", moduleName))
Expand All @@ -373,7 +410,7 @@ func (k BaseKeeper) MintCoins(ctx sdk.Context, moduleName string, amounts sdk.Co
panic(sdkerrors.Wrapf(sdkerrors.ErrUnauthorized, "module account %s does not have permissions to mint tokens", moduleName))
}

err := k.addCoins(ctx, acc.GetAddress(), amounts)
err = k.addCoins(ctx, acc.GetAddress(), amounts)
if err != nil {
return err
}
Expand Down

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