Remove suprious error messages in wallet keymanager (#5090)

* Handle multiple passphrases

* Add tests

Author: mcdee

validator/keymanager/BUILD.bazel

@@ -34,10 +34,14 @@ go_test(
         "direct_interop_test.go",
         "direct_test.go",
         "opts_test.go",
+        "wallet_test.go",
     ],
     embed = [":go_default_library"],
     deps = [
         "//shared/bls:go_default_library",
         "//shared/bytesutil:go_default_library",
+        "@com_github_wealdtech_go_eth2_wallet_encryptor_keystorev4//:go_default_library",
+        "@com_github_wealdtech_go_eth2_wallet_nd//:go_default_library",
+        "@com_github_wealdtech_go_eth2_wallet_store_filesystem//:go_default_library",
     ],
 )

validator/keymanager/wallet.go

@@ -84,15 +84,22 @@ func NewWallet(input string) (KeyManager, string, error) {
 		}
 		re := regexp.MustCompile(accountSpecifier)
 		for account := range wallet.Accounts() {
+			log := log.WithField("account", fmt.Sprintf("%s/%s", wallet.Name(), account.Name()))
 			if re.Match([]byte(account.Name())) {
 				pubKey := bytesutil.ToBytes48(account.PublicKey().Marshal())
+				unlocked := false
 				for _, passphrase := range opts.Passphrases {
 					if err := account.Unlock([]byte(passphrase)); err != nil {
-						log.WithError(err).WithField("pubKey", fmt.Sprintf("%#x", pubKey)).Warn("Failed to unlock account with supplied passphrases; cannot validate")
+						log.WithError(err).Trace("Failed to unlock account with one of the supplied passphrases")
 					} else {
 						km.accounts[pubKey] = account
+						unlocked = true
+						break
 					}
 				}
+				if !unlocked {
+					log.Warn("Failed to unlock account with any supplied passphrase; cannot validate with this key")
+				}
 			}
 		}
 	}

validator/keymanager/wallet_test.go

@@ -0,0 +1,93 @@
+package keymanager_test
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/prysmaticlabs/prysm/validator/keymanager"
+	keystorev4 "github.com/wealdtech/go-eth2-wallet-encryptor-keystorev4"
+	nd "github.com/wealdtech/go-eth2-wallet-nd"
+	filesystem "github.com/wealdtech/go-eth2-wallet-store-filesystem"
+)
+
+func SetupWallet(t *testing.T) string {
+	path, err := ioutil.TempDir("", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	store := filesystem.New(filesystem.WithLocation(path))
+	encryptor := keystorev4.New()
+
+	// Create wallets with keys.
+	w1, err := nd.CreateWallet("Wallet 1", store, encryptor)
+	if err != nil {
+		t.Fatalf("Failed to create wallet: %v", err)
+	}
+	err = w1.Unlock(nil)
+	if err != nil {
+		t.Fatalf("Failed to unlock wallet: %v", err)
+	}
+	_, err = w1.CreateAccount("Account 1", []byte("foo"))
+	if err != nil {
+		t.Fatalf("Failed to create account 1: %v", err)
+	}
+	_, err = w1.CreateAccount("Account 2", []byte("bar"))
+	if err != nil {
+		t.Fatalf("Failed to create account 2: %v", err)
+	}
+
+	return path
+}
+
+func wallet(t *testing.T, opts string) keymanager.KeyManager {
+	km, _, err := keymanager.NewWallet(opts)
+	if err != nil {
+		t.Fatal(err)
+	}
+	return km
+}
+
+func TestMultiplePassphrases(t *testing.T) {
+	path := SetupWallet(t)
+	defer os.RemoveAll(path)
+	tests := []struct {
+		name     string
+		wallet   keymanager.KeyManager
+		accounts int
+	}{
+		{
+			name:     "Neither",
+			wallet:   wallet(t, fmt.Sprintf(`{"location":%q,"accounts":["Wallet 1"],"passphrases":["neither"]}`, path)),
+			accounts: 0,
+		},
+		{
+			name:     "Foo",
+			wallet:   wallet(t, fmt.Sprintf(`{"location":%q,"accounts":["Wallet 1"],"passphrases":["foo"]}`, path)),
+			accounts: 1,
+		},
+		{
+			name:     "Bar",
+			wallet:   wallet(t, fmt.Sprintf(`{"location":%q,"accounts":["Wallet 1"],"passphrases":["bar"]}`, path)),
+			accounts: 1,
+		},
+		{
+			name:     "Both",
+			wallet:   wallet(t, fmt.Sprintf(`{"location":%q,"accounts":["Wallet 1"],"passphrases":["foo","bar"]}`, path)),
+			accounts: 2,
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			keys, err := test.wallet.FetchValidatingKeys()
+			if err != nil {
+				t.Error(err)
+			}
+			if len(keys) != test.accounts {
+				t.Errorf("Found %d keys; expected %d", len(keys), test.accounts)
+			}
+		})
+	}
+}