Merge PR #3767: Added querier for auth module

PENDING.md

@@ -55,9 +55,9 @@ decoded automatically.
 
 * [\#3653] Prompt user confirmation prior to signing and broadcasting a transaction.
 * [\#3670] CLI support for showing bech32 addresses in Ledger devices
-* [\#3711] Update `tx sign` to use `--from` instead of the deprecated `--name`
+* [\#3711] Update `tx sign` to use `--from` instead of the deprecated `--name` CLI flag.
-CLI flag.
 * [\#3730](https://github.com/cosmos/cosmos-sdk/issues/3730) Improve workflow for `gaiad gentx` with offline public keys, by outputting stdtx file that needs to be signed.
+* [\#3761](https://github.com/cosmos/cosmos-sdk/issues/3761) Querying account related information using custom querier in auth module
 
 ### Gaia
 

client/context/query.go

@@ -66,15 +66,13 @@ func (ctx CLIContext) GetAccount(address []byte) (auth.Account, error) {
 		return nil, errors.New("account decoder required but not provided")
 	}
 
-	res, err := ctx.QueryStore(auth.AddressStoreKey(address), ctx.AccountStore)
+	res, err := ctx.queryAccount(address)
 	if err != nil {
 		return nil, err
-	} else if len(res) == 0 {
-		return nil, ErrInvalidAccount(address)
 	}
 
-	account, err := ctx.AccDecoder(res)
+	var account auth.Account
-	if err != nil {
+	if err := ctx.Codec.UnmarshalJSON(res, &account); err != nil {
 		return nil, err
 	}
 
@@ -117,32 +115,33 @@ func (ctx CLIContext) GetAccountSequence(address []byte) (uint64, error) {
 // error is returned if it does not.
 func (ctx CLIContext) EnsureAccountExists() error {
 	addr := ctx.GetFromAddress()
-	accountBytes, err := ctx.QueryStore(auth.AddressStoreKey(addr), ctx.AccountStore)
+	return ctx.EnsureAccountExistsFromAddr(addr)
-	if err != nil {
-		return err
-	}
-
-	if len(accountBytes) == 0 {
-		return ErrInvalidAccount(addr)
-	}
-
-	return nil
 }
 
 // EnsureAccountExistsFromAddr ensures that an account exists for a given
 // address. Instead of using the context's from name, a direct address is
 // given. An error is returned if it does not.
 func (ctx CLIContext) EnsureAccountExistsFromAddr(addr sdk.AccAddress) error {
-	accountBytes, err := ctx.QueryStore(auth.AddressStoreKey(addr), ctx.AccountStore)
+	_, err := ctx.queryAccount(addr)
-	if err != nil {
 	return err
 }
 
-	if len(accountBytes) == 0 {
+// queryAccount queries an account using custom query endpoint of auth module
-		return ErrInvalidAccount(addr)
+// returns an error if result is `null` otherwise account data
+func (ctx CLIContext) queryAccount(addr sdk.AccAddress) ([]byte, error) {
+	bz, err := ctx.Codec.MarshalJSON(auth.NewQueryAccountParams(addr))
+	if err != nil {
+		return nil, err
 	}
 
-	return nil
+	route := fmt.Sprintf("custom/%s/%s", ctx.AccountStore, auth.QueryAccount)
+
+	res, err := ctx.QueryWithData(route, bz)
+	if err != nil {
+		return nil, err
+	}
+
+	return res, nil
 }
 
 // query performs a query from a Tendermint node with the provided store name

cmd/gaia/app/app.go

@@ -157,6 +157,7 @@ func NewGaiaApp(logger log.Logger, db dbm.DB, traceStore io.Writer, loadLatest b
 		AddRoute(gov.RouterKey, gov.NewHandler(app.govKeeper))
 
 	app.QueryRouter().
+		AddRoute(auth.QuerierRoute, auth.NewQuerier(app.accountKeeper)).
 		AddRoute(distr.QuerierRoute, distr.NewQuerier(app.distrKeeper)).
 		AddRoute(gov.QuerierRoute, gov.NewQuerier(app.govKeeper)).
 		AddRoute(slashing.QuerierRoute, slashing.NewQuerier(app.slashingKeeper, app.cdc)).

x/auth/keeper.go

@@ -10,17 +10,22 @@ import (
 	"github.com/cosmos/cosmos-sdk/x/params"
 )
 
-var (
+const (
-	// AddressStoreKeyPrefix prefix for account-by-address store
-	AddressStoreKeyPrefix = []byte{0x01}
-
-	globalAccountNumberKey = []byte("globalAccountNumber")
-
 	// StoreKey is string representation of the store key for auth
 	StoreKey = "acc"
 
 	// FeeStoreKey is a string representation of the store key for fees
 	FeeStoreKey = "fee"
+
+	// QuerierRoute is the querier route for acc
+	QuerierRoute = StoreKey
+)
+
+var (
+	// AddressStoreKeyPrefix prefix for account-by-address store
+	AddressStoreKeyPrefix = []byte{0x01}
+
+	globalAccountNumberKey = []byte("globalAccountNumber")
 )
 
 // AccountKeeper encodes/decodes accounts using the go-amino (binary)

x/auth/querier.go

@@ -0,0 +1,57 @@
+package auth
+
+import (
+	"fmt"
+
+	abci "github.com/tendermint/tendermint/abci/types"
+
+	"github.com/cosmos/cosmos-sdk/codec"
+	sdk "github.com/cosmos/cosmos-sdk/types"
+)
+
+// query endpoints supported by the auth Querier
+const (
+	QueryAccount = "account"
+)
+
+// creates a querier for auth REST endpoints
+func NewQuerier(keeper AccountKeeper) sdk.Querier {
+	return func(ctx sdk.Context, path []string, req abci.RequestQuery) ([]byte, sdk.Error) {
+		switch path[0] {
+		case QueryAccount:
+			return queryAccount(ctx, req, keeper)
+		default:
+			return nil, sdk.ErrUnknownRequest("unknown auth query endpoint")
+		}
+	}
+}
+
+// defines the params for query: "custom/acc/account"
+type QueryAccountParams struct {
+	Address sdk.AccAddress
+}
+
+func NewQueryAccountParams(addr sdk.AccAddress) QueryAccountParams {
+	return QueryAccountParams{
+		Address: addr,
+	}
+}
+
+func queryAccount(ctx sdk.Context, req abci.RequestQuery, keeper AccountKeeper) ([]byte, sdk.Error) {
+	var params QueryAccountParams
+	if err := keeper.cdc.UnmarshalJSON(req.Data, &params); err != nil {
+		return nil, sdk.ErrInternal(fmt.Sprintf("failed to parse params: %s", err))
+	}
+
+	account := keeper.GetAccount(ctx, params.Address)
+	if account == nil {
+		return nil, sdk.ErrUnknownAddress(fmt.Sprintf("account %s does not exist", params.Address))
+	}
+
+	bz, err := codec.MarshalJSONIndent(keeper.cdc, account)
+	if err != nil {
+		return nil, sdk.ErrInternal(sdk.AppendMsgToErr("could not marshal result to JSON", err.Error()))
+	}
+
+	return bz, nil
+}

x/auth/querier_test.go

@@ -0,0 +1,41 @@
+package auth
+
+import (
+	"fmt"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	abci "github.com/tendermint/tendermint/abci/types"
+)
+
+func Test_queryAccount(t *testing.T) {
+	input := setupTestInput()
+	req := abci.RequestQuery{
+		Path: fmt.Sprintf("custom/%s/%s", QuerierRoute, QueryAccount),
+		Data: []byte{},
+	}
+
+	res, err := queryAccount(input.ctx, req, input.ak)
+	require.NotNil(t, err)
+	require.Nil(t, res)
+
+	req.Data = input.cdc.MustMarshalJSON(NewQueryAccountParams([]byte("")))
+	res, err = queryAccount(input.ctx, req, input.ak)
+	require.NotNil(t, err)
+	require.Nil(t, res)
+
+	_, _, addr := keyPubAddr()
+	req.Data = input.cdc.MustMarshalJSON(NewQueryAccountParams(addr))
+	res, err = queryAccount(input.ctx, req, input.ak)
+	require.NotNil(t, err)
+	require.Nil(t, res)
+
+	input.ak.SetAccount(input.ctx, input.ak.NewAccountWithAddress(input.ctx, addr))
+	res, err = queryAccount(input.ctx, req, input.ak)
+	require.Nil(t, err)
+	require.NotNil(t, res)
+
+	var account Account
+	err2 := input.cdc.UnmarshalJSON(res, &account)
+	require.Nil(t, err2)
+}