mirror of https://github.com/ethereum/go-ethereum
Péter Szilágyi
9 years ago
parent
72826bb5ad
commit
86cfc22c79
@ -0,0 +1,53 @@ |
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
|
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package bind |
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import ( |
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"errors" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/core/types" |
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"github.com/ethereum/go-ethereum/crypto" |
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) |
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// NewTransactor is a utility method to easily create a transaction signer from
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// an encrypted json key file and the associated passphrase.
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func NewTransactor(keyjson string, passphrase string) (*TransactOpts, error) { |
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key, err := crypto.DecryptKey([]byte(keyjson), passphrase) |
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if err != nil { |
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return nil, err |
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} |
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return NewKeyedTransactor(key), nil |
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} |
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// NewKeyedTransactor is a utility method to easily create a transaction signer
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// from a plain go-ethereum crypto key.
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func NewKeyedTransactor(key *crypto.Key) *TransactOpts { |
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return &TransactOpts{ |
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Account: key.Address, |
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Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) { |
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if address != key.Address { |
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return nil, errors.New("not authorized to sign this account") |
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} |
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signature, err := crypto.Sign(tx.SigHash().Bytes(), key.PrivateKey) |
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if err != nil { |
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return nil, err |
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} |
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return tx.WithSignature(signature) |
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}, |
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} |
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} |
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@ -0,0 +1,46 @@ |
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
|
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
|
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package backends |
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import ( |
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"math/big" |
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"github.com/ethereum/go-ethereum/accounts/abi/bind" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/core/types" |
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) |
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// nilBackend implements bind.ContractBackend, but panics on any method call.
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// Its sole purpose is to support the binding tests to construct the generated
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// wrappers without calling any methods on them.
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type nilBackend struct{} |
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func (*nilBackend) ContractCall(common.Address, []byte, bool) ([]byte, error) { |
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panic("not implemented") |
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} |
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func (*nilBackend) GasLimit(common.Address, *common.Address, *big.Int, []byte) (*big.Int, error) { |
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panic("not implemented") |
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} |
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func (*nilBackend) GasPrice() (*big.Int, error) { panic("not implemented") } |
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func (*nilBackend) AccountNonce(common.Address) (uint64, error) { panic("not implemented") } |
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func (*nilBackend) SendTransaction(*types.Transaction) error { panic("not implemented") } |
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// NewNilBackend creates a new binding backend that can be used for instantiation
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// but will panic on any invocation. Its sole purpose is to help testing.
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func NewNilBackend() bind.ContractBackend { |
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return new(nilBackend) |
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} |
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@ -0,0 +1,202 @@ |
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
|
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// the Free Software Foundation, either version 3 of the License, or
|
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package backends |
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import ( |
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"encoding/json" |
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"fmt" |
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"math/big" |
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"sync" |
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"sync/atomic" |
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"github.com/ethereum/go-ethereum/accounts/abi/bind" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/core/types" |
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"github.com/ethereum/go-ethereum/rlp" |
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"github.com/ethereum/go-ethereum/rpc" |
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) |
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// rpcBackend implements bind.ContractBackend, and acts as the data provider to
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// Ethereum contracts bound to Go structs. It uses an RPC connection to delegate
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// all its functionality.
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//
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// Note: The current implementation is a blocking one. This should be replaced
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// by a proper async version when a real RPC client is created.
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type rpcBackend struct { |
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client rpc.Client // RPC client connection to interact with an API server
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autoid uint32 // ID number to use for the next API request
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lock sync.Mutex // Singleton access until we get to request multiplexing
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} |
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// NewRPCBackend creates a new binding backend to an RPC provider that can be
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// used to interact with remote contracts.
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func NewRPCBackend(client rpc.Client) bind.ContractBackend { |
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return &rpcBackend{ |
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client: client, |
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} |
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} |
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// request is a JSON RPC request package assembled internally from the client
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// method calls.
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type request struct { |
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JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
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Id int `json:"id"` // Auto incrementing ID number for this request
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Method string `json:"method"` // Remote procedure name to invoke on the server
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Params []interface{} `json:"params"` // List of parameters to pass through (keep types simple)
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} |
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// response is a JSON RPC response package sent back from the API server.
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type response struct { |
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JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
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Id int `json:"id"` // Auto incrementing ID number for this request
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Error json.RawMessage `json:"error"` // Any error returned by the remote side
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Result json.RawMessage `json:"result"` // Whatever the remote side sends us in reply
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} |
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// request forwards an API request to the RPC server, and parses the response.
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//
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// This is currently painfully non-concurrent, but it will have to do until we
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// find the time for niceties like this :P
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func (backend *rpcBackend) request(method string, params []interface{}) (json.RawMessage, error) { |
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backend.lock.Lock() |
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defer backend.lock.Unlock() |
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// Ugly hack to serialize an empty list properly
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if params == nil { |
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params = []interface{}{} |
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} |
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// Assemble the request object
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req := &request{ |
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JsonRpc: "2.0", |
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Id: int(atomic.AddUint32(&backend.autoid, 1)), |
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Method: method, |
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Params: params, |
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} |
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if err := backend.client.Send(req); err != nil { |
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return nil, err |
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} |
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res := new(response) |
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if err := backend.client.Recv(res); err != nil { |
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return nil, err |
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} |
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if len(res.Error) > 0 { |
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return nil, fmt.Errorf("remote error: %s", string(res.Error)) |
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} |
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return res.Result, nil |
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} |
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// ContractCall implements ContractCaller.ContractCall, delegating the execution of
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// a contract call to the remote node, returning the reply to for local processing.
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func (b *rpcBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) { |
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// Pack up the request into an RPC argument
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args := struct { |
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To common.Address `json:"to"` |
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Data string `json:"data"` |
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}{ |
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To: contract, |
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Data: common.ToHex(data), |
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} |
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// Execute the RPC call and retrieve the response
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block := "latest" |
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if pending { |
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block = "pending" |
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} |
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res, err := b.request("eth_call", []interface{}{args, block}) |
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if err != nil { |
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return nil, err |
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} |
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var hex string |
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if err := json.Unmarshal(res, &hex); err != nil { |
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return nil, err |
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} |
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// Convert the response back to a Go byte slice and return
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return common.FromHex(hex), nil |
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} |
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// AccountNonce implements ContractTransactor.AccountNonce, delegating the
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// current account nonce retrieval to the remote node.
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func (b *rpcBackend) AccountNonce(account common.Address) (uint64, error) { |
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res, err := b.request("eth_getTransactionCount", []interface{}{account.Hex(), "pending"}) |
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if err != nil { |
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return 0, err |
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} |
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var hex string |
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if err := json.Unmarshal(res, &hex); err != nil { |
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return 0, err |
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} |
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return new(big.Int).SetBytes(common.FromHex(hex)).Uint64(), nil |
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} |
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// GasPrice implements ContractTransactor.GasPrice, delegating the gas price
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// oracle request to the remote node.
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func (b *rpcBackend) GasPrice() (*big.Int, error) { |
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res, err := b.request("eth_gasPrice", nil) |
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if err != nil { |
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return nil, err |
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} |
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var hex string |
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if err := json.Unmarshal(res, &hex); err != nil { |
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return nil, err |
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} |
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return new(big.Int).SetBytes(common.FromHex(hex)), nil |
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} |
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// GasLimit implements ContractTransactor.GasLimit, delegating the gas estimation
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// to the remote node.
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func (b *rpcBackend) GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) { |
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// Pack up the request into an RPC argument
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args := struct { |
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From common.Address `json:"from"` |
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To *common.Address `json:"to"` |
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Value *rpc.HexNumber `json:"value"` |
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Data string `json:"data"` |
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}{ |
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From: sender, |
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To: contract, |
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Data: common.ToHex(data), |
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Value: rpc.NewHexNumber(value), |
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} |
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// Execute the RPC call and retrieve the response
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res, err := b.request("eth_estimateGas", []interface{}{args}) |
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if err != nil { |
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return nil, err |
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} |
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var hex string |
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if err := json.Unmarshal(res, &hex); err != nil { |
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return nil, err |
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} |
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// Convert the response back to a Go byte slice and return
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return new(big.Int).SetBytes(common.FromHex(hex)), nil |
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} |
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// Transact implements ContractTransactor.SendTransaction, delegating the raw
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// transaction injection to the remote node.
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func (b *rpcBackend) SendTransaction(tx *types.Transaction) error { |
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data, err := rlp.EncodeToBytes(tx) |
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if err != nil { |
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return err |
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} |
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res, err := b.request("eth_sendRawTransaction", []interface{}{common.ToHex(data)}) |
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if err != nil { |
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return err |
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} |
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var hex string |
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if err := json.Unmarshal(res, &hex); err != nil { |
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return err |
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} |
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return nil |
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} |
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@ -0,0 +1,184 @@ |
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// Copyright 2016 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
|
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
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// GNU Lesser General Public License for more details.
|
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//
|
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// You should have received a copy of the GNU Lesser General Public License
|
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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package backends |
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import ( |
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"math/big" |
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"github.com/ethereum/go-ethereum/common" |
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"github.com/ethereum/go-ethereum/core" |
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"github.com/ethereum/go-ethereum/core/state" |
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"github.com/ethereum/go-ethereum/core/types" |
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"github.com/ethereum/go-ethereum/ethdb" |
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"github.com/ethereum/go-ethereum/event" |
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) |
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// SimulatedBackend implements bind.ContractBackend, simulating a blockchain in
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// the background. Its main purpose is to allow easily testing contract bindings.
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type SimulatedBackend struct { |
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database ethdb.Database // In memory database to store our testing data
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blockchain *core.BlockChain // Ethereum blockchain to handle the consensus
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pendingBlock *types.Block // Currently pending block that will be imported on request
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pendingState *state.StateDB // Currently pending state that will be the active on on request
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} |
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// NewSimulatedBackend creates a new binding backend using a simulated blockchain
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// for testing purposes.
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func NewSimulatedBackend(accounts ...core.GenesisAccount) *SimulatedBackend { |
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database, _ := ethdb.NewMemDatabase() |
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core.WriteGenesisBlockForTesting(database, accounts...) |
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blockchain, _ := core.NewBlockChain(database, new(core.FakePow), new(event.TypeMux)) |
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backend := &SimulatedBackend{ |
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database: database, |
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blockchain: blockchain, |
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} |
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backend.Rollback() |
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return backend |
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} |
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// Commit imports all the pending transactions as a single block and starts a
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// fresh new state.
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func (b *SimulatedBackend) Commit() { |
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if _, err := b.blockchain.InsertChain([]*types.Block{b.pendingBlock}); err != nil { |
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panic(err) // This cannot happen unless the simulator is wrong, fail in that case
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} |
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b.Rollback() |
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} |
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// Rollback aborts all pending transactions, reverting to the last committed state.
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func (b *SimulatedBackend) Rollback() { |
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blocks, _ := core.GenerateChain(b.blockchain.CurrentBlock(), b.database, 1, func(int, *core.BlockGen) {}) |
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b.pendingBlock = blocks[0] |
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b.pendingState, _ = state.New(b.pendingBlock.Root(), b.database) |
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} |
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// ContractCall implements ContractCaller.ContractCall, executing the specified
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// contract with the given input data.
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func (b *SimulatedBackend) ContractCall(contract common.Address, data []byte, pending bool) ([]byte, error) { |
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// Create a copy of the current state db to screw around with
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var ( |
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block *types.Block |
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statedb *state.StateDB |
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) |
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if pending { |
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block, statedb = b.pendingBlock, b.pendingState |
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} else { |
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block = b.blockchain.CurrentBlock() |
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statedb, _ = b.blockchain.State() |
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} |
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statedb = statedb.Copy() |
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// Set infinite balance to the a fake caller account
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from := statedb.GetOrNewStateObject(common.Address{}) |
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from.SetBalance(common.MaxBig) |
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// Assemble the call invocation to measure the gas usage
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msg := callmsg{ |
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from: from, |
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to: &contract, |
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gasPrice: new(big.Int), |
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gasLimit: common.MaxBig, |
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value: new(big.Int), |
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data: data, |
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} |
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// Execute the call and return
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vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header()) |
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gaspool := new(core.GasPool).AddGas(common.MaxBig) |
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out, _, err := core.ApplyMessage(vmenv, msg, gaspool) |
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return out, err |
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} |
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// AccountNonce implements ContractTransactor.AccountNonce, retrieving the nonce
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// currently pending for the account.
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func (b *SimulatedBackend) AccountNonce(account common.Address) (uint64, error) { |
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return b.pendingState.GetOrNewStateObject(account).Nonce(), nil |
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} |
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|
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// GasPrice implements ContractTransactor.GasPrice. Since the simulated chain
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// doens't have miners, we just return a gas price of 1 for any call.
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func (b *SimulatedBackend) GasPrice() (*big.Int, error) { |
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return big.NewInt(1), nil |
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} |
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// GasLimit implements ContractTransactor.GasLimit, executing the requested code
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// against the currently pending block/state and returning the used gas.
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func (b *SimulatedBackend) GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) { |
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// Create a copy of the currently pending state db to screw around with
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var ( |
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block = b.pendingBlock |
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statedb = b.pendingState.Copy() |
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) |
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// Set infinite balance to the a fake caller account
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from := statedb.GetOrNewStateObject(sender) |
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from.SetBalance(common.MaxBig) |
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// Assemble the call invocation to measure the gas usage
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msg := callmsg{ |
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from: from, |
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to: contract, |
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gasPrice: new(big.Int), |
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gasLimit: common.MaxBig, |
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value: value, |
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data: data, |
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} |
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// Execute the call and return
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vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header()) |
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gaspool := new(core.GasPool).AddGas(common.MaxBig) |
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_, gas, err := core.ApplyMessage(vmenv, msg, gaspool) |
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return gas, err |
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} |
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// Transact implements ContractTransactor.SendTransaction, delegating the raw
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// transaction injection to the remote node.
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func (b *SimulatedBackend) SendTransaction(tx *types.Transaction) error { |
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blocks, _ := core.GenerateChain(b.blockchain.CurrentBlock(), b.database, 1, func(number int, block *core.BlockGen) { |
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for _, tx := range b.pendingBlock.Transactions() { |
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block.AddTx(tx) |
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} |
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block.AddTx(tx) |
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}) |
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b.pendingBlock = blocks[0] |
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b.pendingState, _ = state.New(b.pendingBlock.Root(), b.database) |
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return nil |
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} |
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// callmsg implements core.Message to allow passing it as a transaction simulator.
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type callmsg struct { |
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from *state.StateObject |
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to *common.Address |
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gasLimit *big.Int |
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gasPrice *big.Int |
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value *big.Int |
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data []byte |
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} |
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|
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func (m callmsg) From() (common.Address, error) { return m.from.Address(), nil } |
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func (m callmsg) FromFrontier() (common.Address, error) { return m.from.Address(), nil } |
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func (m callmsg) Nonce() uint64 { return m.from.Nonce() } |
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func (m callmsg) To() *common.Address { return m.to } |
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func (m callmsg) GasPrice() *big.Int { return m.gasPrice } |
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func (m callmsg) Gas() *big.Int { return m.gasLimit } |
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func (m callmsg) Value() *big.Int { return m.value } |
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func (m callmsg) Data() []byte { return m.data } |
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Reference in new issue