internal/ethapi: warn on failed account accesses

internal/ethapi/api.go

@@ -328,6 +328,9 @@ func (s *PrivateAccountAPI) UnlockAccount(addr common.Address, password string,
 		d = time.Duration(*duration) * time.Second
 	}
 	err := fetchKeystore(s.am).TimedUnlock(accounts.Account{Address: addr}, password, d)
+	if err != nil {
+		log.Warn("Failed account unlock attempt", "address", addr, "err", err)
+	}
 	return err == nil, err
 }
 
@@ -339,7 +342,7 @@ func (s *PrivateAccountAPI) LockAccount(addr common.Address) bool {
 // signTransactions sets defaults and signs the given transaction
 // NOTE: the caller needs to ensure that the nonceLock is held, if applicable,
 // and release it after the transaction has been submitted to the tx pool
-func (s *PrivateAccountAPI) signTransaction(ctx context.Context, args SendTxArgs, passwd string) (*types.Transaction, error) {
+func (s *PrivateAccountAPI) signTransaction(ctx context.Context, args *SendTxArgs, passwd string) (*types.Transaction, error) {
 	// Look up the wallet containing the requested signer
 	account := accounts.Account{Address: args.From}
 	wallet, err := s.am.Find(account)
@@ -370,8 +373,9 @@ func (s *PrivateAccountAPI) SendTransaction(ctx context.Context, args SendTxArgs
 		s.nonceLock.LockAddr(args.From)
 		defer s.nonceLock.UnlockAddr(args.From)
 	}
-	signed, err := s.signTransaction(ctx, args, passwd)
+	signed, err := s.signTransaction(ctx, &args, passwd)
 	if err != nil {
+		log.Warn("Failed transaction send attempt", "from", args.From, "to", args.To, "value", args.Value.ToInt(), "err", err)
 		return common.Hash{}, err
 	}
 	return submitTransaction(ctx, s.b, signed)
@@ -393,8 +397,9 @@ func (s *PrivateAccountAPI) SignTransaction(ctx context.Context, args SendTxArgs
 	if args.Nonce == nil {
 		return nil, fmt.Errorf("nonce not specified")
 	}
-	signed, err := s.signTransaction(ctx, args, passwd)
+	signed, err := s.signTransaction(ctx, &args, passwd)
 	if err != nil {
+		log.Warn("Failed transaction sign attempt", "from", args.From, "to", args.To, "value", args.Value.ToInt(), "err", err)
 		return nil, err
 	}
 	data, err := rlp.EncodeToBytes(signed)
@@ -436,6 +441,7 @@ func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr c
 	// Assemble sign the data with the wallet
 	signature, err := wallet.SignHashWithPassphrase(account, passwd, signHash(data))
 	if err != nil {
+		log.Warn("Failed data sign attempt", "address", addr, "err", err)
 		return nil, err
 	}
 	signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper