R4R: don't lock keybase on lcd startup

PENDING.md

@@ -27,6 +27,9 @@ BREAKING CHANGES
   * [\#3487](https://github.com/cosmos/cosmos-sdk/pull/3487) Move HTTP/REST utilities out of client/utils into a new dedicated client/rest package.
   * [\#3490](https://github.com/cosmos/cosmos-sdk/issues/3490) ReadRESTReq() returns bool to avoid callers to write error responses twice.
   * [\#3502](https://github.com/cosmos/cosmos-sdk/pull/3502) Fixes issue when comparing genesis states
+  * [\#3514](https://github.com/cosmos/cosmos-sdk/pull/3514) Various clean ups:
+    - Replace all GetKeyBase* functions family in favor of NewKeyBaseFromDir and NewKeyBaseFromHomeFlag.
+    - Remove Get prefix from all TxBuilder's getters.
 
 * Tendermint
 
@@ -48,6 +51,8 @@ FEATURES
 * SDK
   * \#3270 [x/staking] limit number of ongoing unbonding delegations /redelegations per pair/trio
   * [\#3477][distribution] new query endpoint "delegator_validators"
+  * [\#3514](https://github.com/cosmos/cosmos-sdk/pull/3514) Provided a lazy loading implementation of Keybase that locks the underlying
+    storage only for the time needed to perform the required operation. Also added Keybase reference to TxBuilder struct.
 
 * Tendermint
 
@@ -62,6 +67,7 @@ IMPROVEMENTS
     * `from` field in the `base_req` body can be a Keybase name or account address
   * [\#3423](https://github.com/cosmos/cosmos-sdk/issues/3423) Allow simulation
   (auto gas) to work with generate only.
+  * [\#3514](https://github.com/cosmos/cosmos-sdk/pull/3514) REST server calls to keybase does not lock the underlying storage anymore.
 
 * Gaia CLI  (`gaiacli`)
   * [\#3476](https://github.com/cosmos/cosmos-sdk/issues/3476) New `withdraw-all-rewards` command to withdraw all delegations rewards for delegators.

client/context/context.go

@@ -35,6 +35,7 @@ type CLIContext struct {
 	Codec         *codec.Codec
 	AccDecoder    auth.AccountDecoder
 	Client        rpcclient.Client
+	Keybase       cryptokeys.Keybase
 	Output        io.Writer
 	OutputFormat  string
 	Height        int64
@@ -276,7 +277,7 @@ func GetFromFields(from string) (sdk.AccAddress, string, error) {
 		return nil, "", nil
 	}
 
-	keybase, err := keys.GetKeyBase()
+	keybase, err := keys.NewKeyBaseFromHomeFlag()
 	if err != nil {
 		return nil, "", err
 	}

client/keys.go

@@ -6,18 +6,9 @@ import (
 	"github.com/cosmos/cosmos-sdk/crypto/keys"
 )
 
-// GetKeyBase initializes a keybase based on the given db.
-// The KeyBase manages all activity requiring access to a key.
-func GetKeyBase(db dbm.DB) keys.Keybase {
-	keybase := keys.New(
-		db,
-	)
-	return keybase
-}
-
 // MockKeyBase generates an in-memory keybase that will be discarded
 // useful for --dry-run to generate a seed phrase without
 // storing the key
 func MockKeyBase() keys.Keybase {
-	return GetKeyBase(dbm.NewMemDB())
+	return keys.New(dbm.NewMemDB())
 }

client/keys/add.go

@@ -105,7 +105,7 @@ func runAddCmd(cmd *cobra.Command, args []string) error {
 		kb = client.MockKeyBase()
 		encryptPassword = app.DefaultKeyPass
 	} else {
-		kb, err = GetKeyBaseWithWritePerm()
+		kb, err = NewKeyBaseFromHomeFlag()
 		if err != nil {
 			return err
 		}
@@ -332,7 +332,7 @@ func AddNewKeyRequestHandler(indent bool) http.HandlerFunc {
 		var kb keys.Keybase
 		var m AddNewKey
 
-		kb, err := GetKeyBaseWithWritePerm()
+		kb, err := NewKeyBaseFromHomeFlag()
 		if CheckAndWriteErrorResponse(w, http.StatusInternalServerError, err) {
 			return
 		}
@@ -435,7 +435,7 @@ func RecoverRequestHandler(indent bool) http.HandlerFunc {
 			return
 		}
 
-		kb, err := GetKeyBaseWithWritePerm()
+		kb, err := NewKeyBaseFromHomeFlag()
 		CheckAndWriteErrorResponse(w, http.StatusInternalServerError, err)
 
 		if name == "" {

client/keys/delete.go

@@ -49,7 +49,7 @@ gaiacli.
 func runDeleteCmd(cmd *cobra.Command, args []string) error {
 	name := args[0]
 
-	kb, err := GetKeyBaseWithWritePerm()
+	kb, err := NewKeyBaseFromHomeFlag()
 	if err != nil {
 		return err
 	}
@@ -114,7 +114,7 @@ func DeleteKeyRequestHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	kb, err = GetKeyBaseWithWritePerm()
+	kb, err = NewKeyBaseFromHomeFlag()
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(err.Error()))

client/keys/list.go

@@ -18,7 +18,7 @@ along with their associated name and address.`,
 }
 
 func runListCmd(cmd *cobra.Command, args []string) error {
-	kb, err := GetKeyBase()
+	kb, err := NewKeyBaseFromHomeFlag()
 	if err != nil {
 		return err
 	}
@@ -36,7 +36,7 @@ func runListCmd(cmd *cobra.Command, args []string) error {
 // query key list REST handler
 func QueryKeysRequestHandler(indent bool) http.HandlerFunc {
 	return func(w http.ResponseWriter, r *http.Request) {
-		kb, err := GetKeyBase()
+		kb, err := NewKeyBaseFromHomeFlag()
 		if err != nil {
 			w.WriteHeader(http.StatusInternalServerError)
 			w.Write([]byte(err.Error()))

client/keys/update.go

@@ -29,7 +29,7 @@ func runUpdateCmd(cmd *cobra.Command, args []string) error {
 	name := args[0]
 
 	buf := client.BufferStdin()
-	kb, err := GetKeyBaseWithWritePerm()
+	kb, err := NewKeyBaseFromHomeFlag()
 	if err != nil {
 		return err
 	}
@@ -77,7 +77,7 @@ func UpdateKeyRequestHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	kb, err = GetKeyBaseWithWritePerm()
+	kb, err = NewKeyBaseFromHomeFlag()
 	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(err.Error()))

client/keys/utils.go

@@ -6,9 +6,7 @@ import (
 	"path/filepath"
 
 	"github.com/spf13/viper"
-	"github.com/syndtr/goleveldb/leveldb/opt"
 	"github.com/tendermint/tendermint/libs/cli"
-	dbm "github.com/tendermint/tendermint/libs/db"
 
 	"github.com/cosmos/cosmos-sdk/client"
 	"github.com/cosmos/cosmos-sdk/codec"
@@ -19,15 +17,12 @@ import (
 // KeyDBName is the directory under root where we store the keys
 const KeyDBName = "keys"
 
-// keybase is used to make GetKeyBase a singleton
-var keybase keys.Keybase
-
 type bechKeyOutFn func(keyInfo keys.Info) (KeyOutput, error)
 
 // GetKeyInfo returns key info for a given name. An error is returned if the
 // keybase cannot be retrieved or getting the info fails.
 func GetKeyInfo(name string) (keys.Info, error) {
-	keybase, err := GetKeyBase()
+	keybase, err := NewKeyBaseFromHomeFlag()
 	if err != nil {
 		return nil, err
 	}
@@ -73,49 +68,19 @@ func ReadPassphraseFromStdin(name string) (string, error) {
 	return passphrase, nil
 }
 
-// TODO make keybase take a database not load from the directory
-
-// GetKeyBase initializes a read-only KeyBase based on the configuration.
-func GetKeyBase() (keys.Keybase, error) {
+// NewKeyBaseFromHomeFlag initializes a Keybase based on the configuration.
+func NewKeyBaseFromHomeFlag() (keys.Keybase, error) {
 	rootDir := viper.GetString(cli.HomeFlag)
-	return GetKeyBaseFromDir(rootDir)
-}
-
-// GetKeyBaseWithWritePerm initialize a keybase based on the configuration with write permissions.
-func GetKeyBaseWithWritePerm() (keys.Keybase, error) {
-	rootDir := viper.GetString(cli.HomeFlag)
-	return GetKeyBaseFromDirWithWritePerm(rootDir)
-}
-
-// GetKeyBaseFromDirWithWritePerm initializes a keybase at a particular dir with write permissions.
-func GetKeyBaseFromDirWithWritePerm(rootDir string) (keys.Keybase, error) {
-	return getKeyBaseFromDirWithOpts(rootDir, nil)
+	return NewKeyBaseFromDir(rootDir)
 }
 
-// GetKeyBaseFromDir initializes a read-only keybase at a particular dir.
-func GetKeyBaseFromDir(rootDir string) (keys.Keybase, error) {
-	// Disabled because of the inability to create a new keys database directory
-	// in the instance of when ReadOnly is set to true.
-	//
-	// ref: syndtr/goleveldb#240
-	// return getKeyBaseFromDirWithOpts(rootDir, &opt.Options{ReadOnly: true})
-	return getKeyBaseFromDirWithOpts(rootDir, nil)
-}
-
-func getKeyBaseFromDirWithOpts(rootDir string, o *opt.Options) (keys.Keybase, error) {
-	if keybase == nil {
-		db, err := dbm.NewGoLevelDBWithOpts(KeyDBName, filepath.Join(rootDir, "keys"), o)
-		if err != nil {
-			return nil, err
-		}
-		keybase = client.GetKeyBase(db)
-	}
-	return keybase, nil
+// NewKeyBaseFromDir initializes a keybase at a particular dir.
+func NewKeyBaseFromDir(rootDir string) (keys.Keybase, error) {
+	return getLazyKeyBaseFromDir(rootDir)
 }
 
-// used to set the keybase manually in test
-func SetKeyBase(kb keys.Keybase) {
-	keybase = kb
+func getLazyKeyBaseFromDir(rootDir string) (keys.Keybase, error) {
+	return keys.NewLazyKeybase(KeyDBName, filepath.Join(rootDir, "keys")), nil
 }
 
 // create a list of KeyOutput in bech32 format