chore: Add Keybase HasByNameOrAddress, HasByName and HasByAddress (gn…

…olang#1313)

The Keybase [interface
has](https://github.com/gnolang/gno/blob/7105d00e10209003ea41fbae7a4d7c463c4167c3/tm2/pkg/crypto/keys/types.go#L16C2-L18)
`GetByNameOrAddress`, `GetByName` and `GetByAddress`. If an application
simply wants to check if the key is in the key base, it must use one of
these and check for an error, as is done [in the gnokey command
line](https://github.com/gnolang/gno/blob/7105d00e10209003ea41fbae7a4d7c463c4167c3/tm2/pkg/crypto/keys/client/add.go#L159-L160).

```
		_, err = kb.GetByName(name)
		if err == nil {
			// account exists, ask for user confirmation
			...
		}
```

A GnoMobile app also needs to check for the key. But it's expensive to
return the entire key info. The byte buffer must be copies multiple
times, in the Keybase and in the gRPC interface, and the key info
structure must be reformatted to Protobuf and then to the application's
language. And not preferable to generate errors to pass information in
normal program flow.

In the underlying `DB` interface, there is already a [Has
function](https://github.com/gnolang/gno/blob/7105d00e10209003ea41fbae7a4d7c463c4167c3/tm2/pkg/db/types.go#L13).
This PR updates the `Keybase` with the related functions
`HasByNameOrAddress`, `HasByName` and `HasByAddress` which use `Has` to
inexpensively return a simple bool. It also updates the gnokey command
line to use `HasByName` to be more clear:

```
		if has, err := kb.HasByName(name); err == nil && has {
			// account exists, ask for user confirmation
			...
		}
```

---------

Signed-off-by: Jeff Thompson <jeff@thefirst.org>
Co-authored-by: Morgan Bazalgette <morgan@morganbaz.com>

tm2/pkg/crypto/keys/client/add.go

@@ -156,8 +156,7 @@ func execAdd(cfg *addCfg, args []string, io commands.IO) error {
 			return err
 		}
 
-		_, err = kb.GetByName(name)
-		if err == nil {
+		if has, err := kb.HasByName(name); err == nil && has {
 			// account exists, ask for user confirmation
 			response, err2 := io.GetConfirmation(fmt.Sprintf("Override the existing name %s", name))
 			if err2 != nil {

tm2/pkg/crypto/keys/keybase.go

@@ -160,14 +160,32 @@ func (kb dbKeybase) List() ([]Info, error) {
 	return res, nil
 }
 
+// HasByNameOrAddress checks if a key with the name or bech32 string address is in the keybase.
+func (kb dbKeybase) HasByNameOrAddress(nameOrBech32 string) (bool, error) {
+	address, err := crypto.AddressFromBech32(nameOrBech32)
+	if err != nil {
+		return kb.HasByName(nameOrBech32)
+	}
+	return kb.HasByAddress(address)
+}
+
+// HasByName checks if a key with the name is in the keybase.
+func (kb dbKeybase) HasByName(name string) (bool, error) {
+	return kb.db.Has(infoKey(name)), nil
+}
+
+// HasByAddress checks if a key with the address is in the keybase.
+func (kb dbKeybase) HasByAddress(address crypto.Address) (bool, error) {
+	return kb.db.Has(addrKey(address)), nil
+}
+
 // Get returns the public information about one key.
 func (kb dbKeybase) GetByNameOrAddress(nameOrBech32 string) (Info, error) {
 	addr, err := crypto.AddressFromBech32(nameOrBech32)
 	if err != nil {
 		return kb.GetByName(nameOrBech32)
-	} else {
-		return kb.GetByAddress(addr)
 	}
+	return kb.GetByAddress(addr)
 }
 
 func (kb dbKeybase) GetByName(name string) (Info, error) {

tm2/pkg/crypto/keys/keybase_test.go

@@ -89,8 +89,9 @@ func TestKeyManagement(t *testing.T) {
 	assert.Empty(t, l)
 
 	// create some keys
-	_, err = cstore.GetByName(n1)
-	require.Error(t, err)
+	has, err := cstore.HasByName(n1)
+	require.NoError(t, err)
+	require.False(t, has)
 	i, err := cstore.CreateAccount(n1, mn1, bip39Passphrase, p1, 0, 0)
 	require.NoError(t, err)
 	require.Equal(t, n1, i.GetName())
@@ -100,10 +101,16 @@ func TestKeyManagement(t *testing.T) {
 	// we can get these keys
 	i2, err := cstore.GetByName(n2)
 	require.NoError(t, err)
-	_, err = cstore.GetByName(n3)
-	require.NotNil(t, err)
-	_, err = cstore.GetByAddress(toAddr(i2))
+	has, err = cstore.HasByName(n3)
+	require.NoError(t, err)
+	require.False(t, has)
+	has, err = cstore.HasByAddress(toAddr(i2))
+	require.NoError(t, err)
+	require.True(t, has)
+	// Also check with HasByNameOrAddress
+	has, err = cstore.HasByNameOrAddress(crypto.AddressToBech32(toAddr(i2)))
 	require.NoError(t, err)
+	require.True(t, has)
 	addr, err := crypto.AddressFromBech32("g1frtkxv37nq7arvyz5p0mtjqq7hwuvd4dnt892p")
 	require.NoError(t, err)
 	_, err = cstore.GetByAddress(addr)
@@ -127,8 +134,9 @@ func TestKeyManagement(t *testing.T) {
 	keyS, err = cstore.List()
 	require.NoError(t, err)
 	require.Equal(t, 1, len(keyS))
-	_, err = cstore.GetByName(n1)
-	require.Error(t, err)
+	has, err = cstore.HasByName(n1)
+	require.NoError(t, err)
+	require.False(t, has)
 
 	// create an offline key
 	o1 := "offline"
@@ -388,8 +396,9 @@ func TestSeedPhrase(t *testing.T) {
 	// now, let us delete this key
 	err = cstore.Delete(n1, p1, false)
 	require.Nil(t, err, "%+v", err)
-	_, err = cstore.GetByName(n1)
-	require.NotNil(t, err)
+	has, err := cstore.HasByName(n1)
+	require.NoError(t, err)
+	require.False(t, has)
 }
 
 func ExampleNew() {

tm2/pkg/crypto/keys/lazy_keybase.go

@@ -37,6 +37,36 @@ func (lkb lazyKeybase) List() ([]Info, error) {
 	return NewDBKeybase(db).List()
 }
 
+func (lkb lazyKeybase) HasByNameOrAddress(nameOrBech32 string) (bool, error) {
+	db, err := db.NewDB(lkb.name, dbBackend, lkb.dir)
+	if err != nil {
+		return false, err
+	}
+	defer db.Close()
+
+	return NewDBKeybase(db).HasByNameOrAddress(nameOrBech32)
+}
+
+func (lkb lazyKeybase) HasByName(name string) (bool, error) {
+	db, err := db.NewDB(lkb.name, dbBackend, lkb.dir)
+	if err != nil {
+		return false, err
+	}
+	defer db.Close()
+
+	return NewDBKeybase(db).HasByName(name)
+}
+
+func (lkb lazyKeybase) HasByAddress(address crypto.Address) (bool, error) {
+	db, err := db.NewDB(lkb.name, dbBackend, lkb.dir)
+	if err != nil {
+		return false, err
+	}
+	defer db.Close()
+
+	return NewDBKeybase(db).HasByAddress(address)
+}
+
 func (lkb lazyKeybase) GetByNameOrAddress(nameOrBech32 string) (Info, error) {
 	db, err := db.NewDB(lkb.name, dbBackend, lkb.dir)
 	if err != nil {

tm2/pkg/crypto/keys/types.go

@@ -13,6 +13,9 @@ import (
 type Keybase interface {
 	// CRUD on the keystore
 	List() ([]Info, error)
+	HasByNameOrAddress(nameOrBech32 string) (bool, error)
+	HasByName(name string) (bool, error)
+	HasByAddress(address crypto.Address) (bool, error)
 	GetByNameOrAddress(nameOrBech32 string) (Info, error)
 	GetByName(name string) (Info, error)
 	GetByAddress(address crypto.Address) (Info, error)