1 files changed, 63 insertions, 0 deletions
diff --git a/accounts/abi/bind/backend.go b/accounts/abi/bind/backend.go
new file mode 100644
index 000000000..328f9f3b7
--- /dev/null
+++ b/accounts/abi/bind/backend.go
@@ -0,0 +1,63 @@
+// Copyright 2016 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package bind
+
+import (
+	"math/big"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/core/types"
+)
+
+// ContractCaller defines the methods needed to allow operating with contract on a read
+// only basis.
+type ContractCaller interface {
+	// ContractCall executes an Ethereum contract call with the specified data as
+	// the input. The pending flag requests execution against the pending block, not
+	// the stable head of the chain.
+	ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error)
+}
+
+// ContractTransactor defines the methods needed to allow operating with contract
+// on a write only basis. Beside the transacting method, the remainder are helpers
+// used when the user does not provide some needed values, but rather leaves it up
+// to the transactor to decide.
+type ContractTransactor interface {
+	// Nonce retrieves the current pending nonce associated with an account.
+	PendingAccountNonce(account common.Address) (uint64, error)
+
+	// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
+	// execution of a transaction.
+	SuggestGasPrice() (*big.Int, error)
+
+	// EstimateGasLimit tries to estimate the gas needed to execute a specific
+	// transaction based on the current pending state of the backend blockchain.
+	// There is no guarantee that this is the true gas limit requirement as other
+	// transactions may be added or removed by miners, but it should provide a basis
+	// for setting a reasonable default.
+	EstimateGasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error)
+
+	// SendTransaction injects the transaction into the pending pool for execution.
+	SendTransaction(*types.Transaction) error
+}
+
+// ContractBackend defines the methods needed to allow operating with contract
+// on a read-write basis.
+type ContractBackend interface {
+	ContractCaller
+	ContractTransactor
+}