accounts/abi/bind, cmd/abigen: port to templates, bind to solidity

This commit is contained in:
Péter Szilágyi 2016-03-21 14:34:49 +02:00
parent 86cfc22c79
commit 73308dbe0e
10 changed files with 595 additions and 449 deletions

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@ -18,6 +18,8 @@ package bind
import (
"errors"
"io"
"io/ioutil"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core/types"
@ -25,9 +27,13 @@ import (
)
// NewTransactor is a utility method to easily create a transaction signer from
// an encrypted json key file and the associated passphrase.
func NewTransactor(keyjson string, passphrase string) (*TransactOpts, error) {
key, err := crypto.DecryptKey([]byte(keyjson), passphrase)
// an encrypted json key stream and the associated passphrase.
func NewTransactor(keyin io.Reader, passphrase string) (*TransactOpts, error) {
json, err := ioutil.ReadAll(keyin)
if err != nil {
return nil, err
}
key, err := crypto.DecryptKey(json, passphrase)
if err != nil {
return nil, err
}
@ -38,7 +44,7 @@ func NewTransactor(keyjson string, passphrase string) (*TransactOpts, error) {
// from a plain go-ethereum crypto key.
func NewKeyedTransactor(key *crypto.Key) *TransactOpts {
return &TransactOpts{
Account: key.Address,
From: key.Address,
Signer: func(address common.Address, tx *types.Transaction) (*types.Transaction, error) {
if address != key.Address {
return nil, errors.New("not authorized to sign this account")

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@ -38,14 +38,18 @@ type ContractCaller interface {
// to the transactor to decide.
type ContractTransactor interface {
// Nonce retrieves the current pending nonce associated with an account.
AccountNonce(account common.Address) (uint64, error)
PendingAccountNonce(account common.Address) (uint64, error)
// GasPrice retrieves the currently suggested gas price to allow a timely execution
// of a transaction.
GasPrice() (*big.Int, error)
// SuggestGasPrice retrieves the currently suggested gas price to allow a timely
// execution of a transaction.
SuggestGasPrice() (*big.Int, error)
// GasLimit tries to estimate the gas needed to execute a specific transaction.
GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*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

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@ -24,6 +24,9 @@ import (
"github.com/ethereum/go-ethereum/core/types"
)
// This nil assignment ensures compile time that nilBackend implements bind.ContractBackend.
var _ bind.ContractBackend = (*nilBackend)(nil)
// nilBackend implements bind.ContractBackend, but panics on any method call.
// Its sole purpose is to support the binding tests to construct the generated
// wrappers without calling any methods on them.
@ -32,11 +35,11 @@ type nilBackend struct{}
func (*nilBackend) ContractCall(common.Address, []byte, bool) ([]byte, error) {
panic("not implemented")
}
func (*nilBackend) GasLimit(common.Address, *common.Address, *big.Int, []byte) (*big.Int, error) {
func (*nilBackend) EstimateGasLimit(common.Address, *common.Address, *big.Int, []byte) (*big.Int, error) {
panic("not implemented")
}
func (*nilBackend) GasPrice() (*big.Int, error) { panic("not implemented") }
func (*nilBackend) AccountNonce(common.Address) (uint64, error) { panic("not implemented") }
func (*nilBackend) SuggestGasPrice() (*big.Int, error) { panic("not implemented") }
func (*nilBackend) PendingAccountNonce(common.Address) (uint64, error) { panic("not implemented") }
func (*nilBackend) SendTransaction(*types.Transaction) error { panic("not implemented") }
// NewNilBackend creates a new binding backend that can be used for instantiation

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@ -30,6 +30,9 @@ import (
"github.com/ethereum/go-ethereum/rpc"
)
// This nil assignment ensures compile time that rpcBackend implements bind.ContractBackend.
var _ bind.ContractBackend = (*rpcBackend)(nil)
// rpcBackend implements bind.ContractBackend, and acts as the data provider to
// Ethereum contracts bound to Go structs. It uses an RPC connection to delegate
// all its functionality.
@ -53,16 +56,16 @@ func NewRPCBackend(client rpc.Client) bind.ContractBackend {
// request is a JSON RPC request package assembled internally from the client
// method calls.
type request struct {
JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
Id int `json:"id"` // Auto incrementing ID number for this request
JSONRPC string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
ID int `json:"id"` // Auto incrementing ID number for this request
Method string `json:"method"` // Remote procedure name to invoke on the server
Params []interface{} `json:"params"` // List of parameters to pass through (keep types simple)
}
// response is a JSON RPC response package sent back from the API server.
type response struct {
JsonRpc string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
Id int `json:"id"` // Auto incrementing ID number for this request
JSONRPC string `json:"jsonrpc"` // Version of the JSON RPC protocol, always set to 2.0
ID int `json:"id"` // Auto incrementing ID number for this request
Error json.RawMessage `json:"error"` // Any error returned by the remote side
Result json.RawMessage `json:"result"` // Whatever the remote side sends us in reply
}
@ -71,9 +74,9 @@ type response struct {
//
// This is currently painfully non-concurrent, but it will have to do until we
// find the time for niceties like this :P
func (backend *rpcBackend) request(method string, params []interface{}) (json.RawMessage, error) {
backend.lock.Lock()
defer backend.lock.Unlock()
func (b *rpcBackend) request(method string, params []interface{}) (json.RawMessage, error) {
b.lock.Lock()
defer b.lock.Unlock()
// Ugly hack to serialize an empty list properly
if params == nil {
@ -81,16 +84,16 @@ func (backend *rpcBackend) request(method string, params []interface{}) (json.Ra
}
// Assemble the request object
req := &request{
JsonRpc: "2.0",
Id: int(atomic.AddUint32(&backend.autoid, 1)),
JSONRPC: "2.0",
ID: int(atomic.AddUint32(&b.autoid, 1)),
Method: method,
Params: params,
}
if err := backend.client.Send(req); err != nil {
if err := b.client.Send(req); err != nil {
return nil, err
}
res := new(response)
if err := backend.client.Recv(res); err != nil {
if err := b.client.Recv(res); err != nil {
return nil, err
}
if len(res.Error) > 0 {
@ -127,9 +130,9 @@ func (b *rpcBackend) ContractCall(contract common.Address, data []byte, pending
return common.FromHex(hex), nil
}
// AccountNonce implements ContractTransactor.AccountNonce, delegating the
// current account nonce retrieval to the remote node.
func (b *rpcBackend) AccountNonce(account common.Address) (uint64, error) {
// PendingAccountNonce implements ContractTransactor.PendingAccountNonce, delegating
// the current account nonce retrieval to the remote node.
func (b *rpcBackend) PendingAccountNonce(account common.Address) (uint64, error) {
res, err := b.request("eth_getTransactionCount", []interface{}{account.Hex(), "pending"})
if err != nil {
return 0, err
@ -138,12 +141,16 @@ func (b *rpcBackend) AccountNonce(account common.Address) (uint64, error) {
if err := json.Unmarshal(res, &hex); err != nil {
return 0, err
}
return new(big.Int).SetBytes(common.FromHex(hex)).Uint64(), nil
nonce, ok := new(big.Int).SetString(hex, 0)
if !ok {
return 0, fmt.Errorf("invalid nonce hex: %s", hex)
}
return nonce.Uint64(), nil
}
// GasPrice implements ContractTransactor.GasPrice, delegating the gas price
// oracle request to the remote node.
func (b *rpcBackend) GasPrice() (*big.Int, error) {
// SuggestGasPrice implements ContractTransactor.SuggestGasPrice, delegating the
// gas price oracle request to the remote node.
func (b *rpcBackend) SuggestGasPrice() (*big.Int, error) {
res, err := b.request("eth_gasPrice", nil)
if err != nil {
return nil, err
@ -152,12 +159,16 @@ func (b *rpcBackend) GasPrice() (*big.Int, error) {
if err := json.Unmarshal(res, &hex); err != nil {
return nil, err
}
return new(big.Int).SetBytes(common.FromHex(hex)), nil
price, ok := new(big.Int).SetString(hex, 0)
if !ok {
return nil, fmt.Errorf("invalid price hex: %s", hex)
}
return price, nil
}
// GasLimit implements ContractTransactor.GasLimit, delegating the gas estimation
// to the remote node.
func (b *rpcBackend) GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
// EstimateGasLimit implements ContractTransactor.EstimateGasLimit, delegating
// the gas estimation to the remote node.
func (b *rpcBackend) EstimateGasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
// Pack up the request into an RPC argument
args := struct {
From common.Address `json:"from"`
@ -179,12 +190,15 @@ func (b *rpcBackend) GasLimit(sender common.Address, contract *common.Address, v
if err := json.Unmarshal(res, &hex); err != nil {
return nil, err
}
// Convert the response back to a Go byte slice and return
return new(big.Int).SetBytes(common.FromHex(hex)), nil
estimate, ok := new(big.Int).SetString(hex, 0)
if !ok {
return nil, fmt.Errorf("invalid estimate hex: %s", hex)
}
return estimate, nil
}
// Transact implements ContractTransactor.SendTransaction, delegating the raw
// transaction injection to the remote node.
// SendTransaction implements ContractTransactor.SendTransaction, delegating the
// raw transaction injection to the remote node.
func (b *rpcBackend) SendTransaction(tx *types.Transaction) error {
data, err := rlp.EncodeToBytes(tx)
if err != nil {

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@ -19,6 +19,7 @@ package backends
import (
"math/big"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/core"
"github.com/ethereum/go-ethereum/core/state"
@ -27,6 +28,9 @@ import (
"github.com/ethereum/go-ethereum/event"
)
// This nil assignment ensures compile time that SimulatedBackend implements bind.ContractBackend.
var _ bind.ContractBackend = (*SimulatedBackend)(nil)
// SimulatedBackend implements bind.ContractBackend, simulating a blockchain in
// the background. Its main purpose is to allow easily testing contract bindings.
type SimulatedBackend struct {
@ -79,13 +83,11 @@ func (b *SimulatedBackend) ContractCall(contract common.Address, data []byte, pe
statedb *state.StateDB
)
if pending {
block, statedb = b.pendingBlock, b.pendingState
block, statedb = b.pendingBlock, b.pendingState.Copy()
} else {
block = b.blockchain.CurrentBlock()
statedb, _ = b.blockchain.State()
}
statedb = statedb.Copy()
// Set infinite balance to the a fake caller account
from := statedb.GetOrNewStateObject(common.Address{})
from.SetBalance(common.MaxBig)
@ -100,28 +102,29 @@ func (b *SimulatedBackend) ContractCall(contract common.Address, data []byte, pe
data: data,
}
// Execute the call and return
vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header())
vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header(), nil)
gaspool := new(core.GasPool).AddGas(common.MaxBig)
out, _, err := core.ApplyMessage(vmenv, msg, gaspool)
return out, err
}
// AccountNonce implements ContractTransactor.AccountNonce, retrieving the nonce
// currently pending for the account.
func (b *SimulatedBackend) AccountNonce(account common.Address) (uint64, error) {
// PendingAccountNonce implements ContractTransactor.PendingAccountNonce, retrieving
// the nonce currently pending for the account.
func (b *SimulatedBackend) PendingAccountNonce(account common.Address) (uint64, error) {
return b.pendingState.GetOrNewStateObject(account).Nonce(), nil
}
// GasPrice implements ContractTransactor.GasPrice. Since the simulated chain
// doens't have miners, we just return a gas price of 1 for any call.
func (b *SimulatedBackend) GasPrice() (*big.Int, error) {
// SuggestGasPrice implements ContractTransactor.SuggestGasPrice. Since the simulated
// chain doens't have miners, we just return a gas price of 1 for any call.
func (b *SimulatedBackend) SuggestGasPrice() (*big.Int, error) {
return big.NewInt(1), nil
}
// GasLimit implements ContractTransactor.GasLimit, executing the requested code
// against the currently pending block/state and returning the used gas.
func (b *SimulatedBackend) GasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
// EstimateGasLimit implements ContractTransactor.EstimateGasLimit, executing the
// requested code against the currently pending block/state and returning the used
// gas.
func (b *SimulatedBackend) EstimateGasLimit(sender common.Address, contract *common.Address, value *big.Int, data []byte) (*big.Int, error) {
// Create a copy of the currently pending state db to screw around with
var (
block = b.pendingBlock
@ -142,14 +145,14 @@ func (b *SimulatedBackend) GasLimit(sender common.Address, contract *common.Addr
data: data,
}
// Execute the call and return
vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header())
vmenv := core.NewEnv(statedb, b.blockchain, msg, block.Header(), nil)
gaspool := new(core.GasPool).AddGas(common.MaxBig)
_, gas, err := core.ApplyMessage(vmenv, msg, gaspool)
return gas, err
}
// Transact implements ContractTransactor.SendTransaction, delegating the raw
// SendTransaction implements ContractTransactor.SendTransaction, delegating the raw
// transaction injection to the remote node.
func (b *SimulatedBackend) SendTransaction(tx *types.Transaction) error {
blocks, _ := core.GenerateChain(b.blockchain.CurrentBlock(), b.database, 1, func(number int, block *core.BlockGen) {

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@ -39,7 +39,7 @@ type CallOpts struct {
// TransactOpts is the collection of authorization data required to create a
// valid Ethereum transaction.
type TransactOpts struct {
Account common.Address // Ethereum account to send the transaction from
From common.Address // Ethereum account to send the transaction from
Nonce *big.Int // Nonce to use for the transaction execution (nil = use pending state)
Signer SignerFn // Method to use for signing the transaction (mandatory)
@ -72,12 +72,8 @@ func NewBoundContract(address common.Address, abi abi.ABI, caller ContractCaller
// DeployContract deploys a contract onto the Ethereum blockchain and binds the
// deployment address with a Go wrapper.
func DeployContract(opts *TransactOpts, abi abi.ABI, bytecode []byte, backend ContractBackend, params ...interface{}) (common.Address, *types.Transaction, *BoundContract, error) {
// Sanity check the authorization options
if opts == nil {
return common.Address{}, nil, nil, errors.New("transaction options missing")
}
// Otherwise try to deploy the contract
c := NewBoundContract(common.Address{}, abi, backend.(ContractCaller), backend.(ContractTransactor))
c := NewBoundContract(common.Address{}, abi, backend, backend)
input, err := c.abi.Pack("", params...)
if err != nil {
@ -87,7 +83,7 @@ func DeployContract(opts *TransactOpts, abi abi.ABI, bytecode []byte, backend Co
if err != nil {
return common.Address{}, nil, nil, err
}
c.address = crypto.CreateAddress(opts.Account, tx.Nonce())
c.address = crypto.CreateAddress(opts.From, tx.Nonce())
return c.address, tx, c, nil
}
@ -115,10 +111,6 @@ func (c *BoundContract) Call(opts *CallOpts, result interface{}, method string,
// Transact invokes the (paid) contract method with params as input values and
// value as the fund transfer to the contract.
func (c *BoundContract) Transact(opts *TransactOpts, method string, params ...interface{}) (*types.Transaction, error) {
// Sanity check the authorization options
if opts == nil {
return nil, errors.New("transaction options missing")
}
// Otherwise pack up the parameters and invoke the contract
input, err := c.abi.Pack(method, params...)
if err != nil {
@ -139,7 +131,7 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
}
nonce := uint64(0)
if opts.Nonce == nil {
nonce, err = c.transactor.AccountNonce(opts.Account)
nonce, err = c.transactor.PendingAccountNonce(opts.From)
if err != nil {
return nil, fmt.Errorf("failed to retrieve account nonce: %v", err)
}
@ -149,14 +141,14 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
// Figure out the gas allowance and gas price values
gasPrice := opts.GasPrice
if gasPrice == nil {
gasPrice, err = c.transactor.GasPrice()
gasPrice, err = c.transactor.SuggestGasPrice()
if err != nil {
return nil, fmt.Errorf("failed to suggest gas price: %v", err)
}
}
gasLimit := opts.GasLimit
if gasLimit == nil {
gasLimit, err = c.transactor.GasLimit(opts.Account, contract, value, input)
gasLimit, err = c.transactor.EstimateGasLimit(opts.From, contract, value, input)
if err != nil {
return nil, fmt.Errorf("failed to exstimate gas needed: %v", err)
}
@ -171,7 +163,7 @@ func (c *BoundContract) transact(opts *TransactOpts, contract *common.Address, i
if opts.Signer == nil {
return nil, errors.New("no signer to authorize the transaction with")
}
signedTx, err := opts.Signer(opts.Account, rawTx)
signedTx, err := opts.Signer(opts.From, rawTx)
if err != nil {
return nil, err
}

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@ -15,13 +15,17 @@
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
// Package bind generates Ethereum contract Go bindings.
//
// Detailed usage document and tutorial available on the go-ethereum Wiki page:
// https://github.com/ethereum/go-ethereum/wiki/Native-DApps:-Go-bindings-to-Ethereum-contracts
package bind
import (
"bytes"
"fmt"
"sort"
"strings"
"text/template"
"unicode"
"github.com/ethereum/go-ethereum/accounts/abi"
"golang.org/x/tools/imports"
@ -31,254 +35,84 @@ import (
// to be used as is in client code, but rather as an intermediate struct which
// enforces compile time type safety and naming convention opposed to having to
// manually maintain hard coded strings that break on runtime.
func Bind(abijson string, bytecode string, pkg string, kind string) (string, error) {
func Bind(types []string, abis []string, bytecodes []string, pkg string) (string, error) {
// Process each individual contract requested binding
contracts := make(map[string]*tmplContract)
for i := 0; i < len(types); i++ {
// Parse the actual ABI to generate the binding for
abi, err := abi.JSON(strings.NewReader(abijson))
evmABI, err := abi.JSON(strings.NewReader(abis[i]))
if err != nil {
return "", err
}
// Generate the contract type, fields and methods
code := new(bytes.Buffer)
kind = strings.ToUpper(kind[:1]) + kind[1:]
fmt.Fprintf(code, "%s\n", bindContract(kind, strings.TrimSpace(abijson)))
fmt.Fprintf(code, "%s\n", bindConstructor(kind, strings.TrimSpace(bytecode), abi.Constructor))
methods := make([]string, 0, len(abi.Methods))
for name, _ := range abi.Methods {
methods = append(methods, name)
// Strip any whitespace from the JSON ABI
strippedABI := strings.Map(func(r rune) rune {
if unicode.IsSpace(r) {
return -1
}
sort.Strings(methods)
return r
}, abis[i])
for _, method := range methods {
fmt.Fprintf(code, "%s\n", bindMethod(kind, abi.Methods[method]))
// Extract the call and transact methods, and sort them alphabetically
var (
calls = make(map[string]*tmplMethod)
transacts = make(map[string]*tmplMethod)
)
for _, original := range evmABI.Methods {
// Normalize the method for capital cases and non-anonymous inputs/outputs
normalized := original
normalized.Name = capitalise(original.Name)
normalized.Inputs = make([]abi.Argument, len(original.Inputs))
copy(normalized.Inputs, original.Inputs)
for j, input := range normalized.Inputs {
if input.Name == "" {
normalized.Inputs[j].Name = fmt.Sprintf("arg%d", j)
}
}
normalized.Outputs = make([]abi.Argument, len(original.Outputs))
copy(normalized.Outputs, original.Outputs)
for j, output := range normalized.Outputs {
if output.Name != "" {
normalized.Outputs[j].Name = capitalise(output.Name)
}
}
// Append the methos to the call or transact lists
if original.Const {
calls[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original)}
} else {
transacts[original.Name] = &tmplMethod{Original: original, Normalized: normalized, Structured: structured(original)}
}
}
contracts[types[i]] = &tmplContract{
Type: capitalise(types[i]),
InputABI: strippedABI,
InputBin: strings.TrimSpace(bytecodes[i]),
Constructor: evmABI.Constructor,
Calls: calls,
Transacts: transacts,
}
}
// Generate the contract template data content and render it
data := &tmplData{
Package: pkg,
Contracts: contracts,
}
// Format the code with goimports and return
buffer := new(bytes.Buffer)
fmt.Fprintf(buffer, "// This file is an automatically generated Go binding based on the contract ABI\n")
fmt.Fprintf(buffer, "// defined in %sABI. Do not modify as any change will likely be lost!\n\n", kind)
fmt.Fprintf(buffer, "package %s\n\n", pkg)
fmt.Fprintf(buffer, "%s\n\n", string(code.Bytes()))
blob, err := imports.Process("", buffer.Bytes(), nil)
funcs := map[string]interface{}{
"bindtype": bindType,
}
tmpl := template.Must(template.New("").Funcs(funcs).Parse(tmplSource))
if err := tmpl.Execute(buffer, data); err != nil {
return "", err
}
// Pass the code through goimports to clean it up and double check
code, err := imports.Process("", buffer.Bytes(), nil)
if err != nil {
return "", fmt.Errorf("%v\n%s", err, code)
return "", fmt.Errorf("%v\n%s", err, buffer)
}
return string(blob), nil
}
// bindContract generates the basic wrapper code for interacting with an Ethereum
// contract via the abi package. All contract methods will call into the generic
// ones generated here.
func bindContract(kind string, abijson string) string {
code := ""
// Generate the hard coded ABI used for Ethereum interaction
code += fmt.Sprintf("// Ethereum ABI used to generate the binding from.\nconst %sABI = `%s`\n\n", kind, abijson)
// Generate the high level contract wrapper types
code += fmt.Sprintf("// %s is an auto generated Go binding around an Ethereum contract.\n", kind)
code += fmt.Sprintf("type %s struct {\n", kind)
code += fmt.Sprintf(" %sCaller // Read-only binding to the contract\n", kind)
code += fmt.Sprintf(" %sTransactor // Write-only binding to the contract\n", kind)
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("// %sCaller is an auto generated read-only Go binding around an Ethereum contract.\n", kind)
code += fmt.Sprintf("type %sCaller struct {\n", kind)
code += fmt.Sprintf(" contract *bind.BoundContract // Generic contract wrapper for the low level calls\n")
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("// %sTransactor is an auto generated write-only Go binding around an Ethereum contract.\n", kind)
code += fmt.Sprintf("type %sTransactor struct {\n", kind)
code += fmt.Sprintf(" contract *bind.BoundContract // Generic contract wrapper for the low level calls\n")
code += fmt.Sprintf("}\n\n")
// Generate the high level contract session wrapper types
code += fmt.Sprintf("// %sSession is an auto generated Go binding around an Ethereum contract,\n// with pre-set call and transact options.\n", kind)
code += fmt.Sprintf("type %sSession struct {\n", kind)
code += fmt.Sprintf(" Contract *%s // Generic contract binding to set the session for\n", kind)
code += fmt.Sprintf(" CallOpts bind.CallOpts // Call options to use throughout this session\n")
code += fmt.Sprintf(" TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session\n")
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("// %sCallerSession is an auto generated read-only Go binding around an Ethereum contract,\n// with pre-set call options.\n", kind)
code += fmt.Sprintf("type %sCallerSession struct {\n", kind)
code += fmt.Sprintf(" Contract *%sCaller // Generic contract caller binding to set the session for\n", kind)
code += fmt.Sprintf(" CallOpts bind.CallOpts // Call options to use throughout this session\n")
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("// %sTransactorSession is an auto generated write-only Go binding around an Ethereum contract,\n// with pre-set transact options.\n", kind)
code += fmt.Sprintf("type %sTransactorSession struct {\n", kind)
code += fmt.Sprintf(" Contract *%sTransactor // Generic contract transactor binding to set the session for\n", kind)
code += fmt.Sprintf(" TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session\n")
code += fmt.Sprintf("}\n\n")
// Generate the constructor to create a bound contract
code += fmt.Sprintf("// New%s creates a new instance of %s, bound to a specific deployed contract.\n", kind, kind)
code += fmt.Sprintf("func New%s(address common.Address, backend bind.ContractBackend) (*%s, error) {\n", kind, kind)
code += fmt.Sprintf(" contract, err := bind%s(address, backend.(bind.ContractCaller), backend.(bind.ContractTransactor))\n", kind)
code += fmt.Sprintf(" if err != nil {\n")
code += fmt.Sprintf(" return nil, err\n")
code += fmt.Sprintf(" }\n")
code += fmt.Sprintf(" return &%s{%sCaller: %sCaller{contract: contract}, %sTransactor: %sTransactor{contract: contract}}, nil\n", kind, kind, kind, kind, kind)
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("// New%sCaller creates a new read-only instance of %s, bound to a specific deployed contract.\n", kind, kind)
code += fmt.Sprintf("func New%sCaller(address common.Address, caller bind.ContractCaller) (*%sCaller, error) {\n", kind, kind)
code += fmt.Sprintf(" contract, err := bind%s(address, caller, nil)\n", kind)
code += fmt.Sprintf(" if err != nil {\n")
code += fmt.Sprintf(" return nil, err\n")
code += fmt.Sprintf(" }\n")
code += fmt.Sprintf(" return &%sCaller{contract: contract}, nil\n", kind)
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("// New%sTransactor creates a new write-only instance of %s, bound to a specific deployed contract.\n", kind, kind)
code += fmt.Sprintf("func New%sTransactor(address common.Address, transactor bind.ContractTransactor) (*%sTransactor, error) {\n", kind, kind)
code += fmt.Sprintf(" contract, err := bind%s(address, nil, transactor)\n", kind)
code += fmt.Sprintf(" if err != nil {\n")
code += fmt.Sprintf(" return nil, err\n")
code += fmt.Sprintf(" }\n")
code += fmt.Sprintf(" return &%sTransactor{contract: contract}, nil\n", kind)
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("// bind%s binds a generic wrapper to an already deployed contract.\n", kind)
code += fmt.Sprintf("func bind%s(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*bind.BoundContract, error) {\n", kind)
code += fmt.Sprintf(" parsed, err := abi.JSON(strings.NewReader(%sABI))\n", kind)
code += fmt.Sprintf(" if err != nil {\n")
code += fmt.Sprintf(" return nil, err\n")
code += fmt.Sprintf(" }\n")
code += fmt.Sprintf(" return bind.NewBoundContract(address, parsed, caller, transactor), nil\n")
code += fmt.Sprintf("}")
return code
}
// bindConstructor
func bindConstructor(kind string, bytecode string, constructor abi.Method) string {
// If no byte code was supplied, we cannot deploy
if bytecode == "" {
return ""
}
// Otherwise store the bytecode into a global constant
code := fmt.Sprintf("// Ethereum VM bytecode used for deploying new contracts.\nconst %sBin = `%s`\n\n", kind, bytecode)
// Generate the argument list for the constructor
args := make([]string, 0, len(constructor.Inputs))
for i, arg := range constructor.Inputs {
param := arg.Name
if param == "" {
param = fmt.Sprintf("arg%d", i)
}
args = append(args, fmt.Sprintf("%s %s", param, bindType(arg.Type)))
}
arglist := ""
if len(args) > 0 {
arglist = "," + strings.Join(args, ",")
}
// Generate the cal parameter list for the dpeloyer
params := make([]string, len(args))
for i, param := range args {
params[i] = strings.Split(param, " ")[0]
}
paramlist := ""
if len(params) > 0 {
paramlist = "," + strings.Join(params, ",")
}
// And generate the global deployment function
code += fmt.Sprintf("// Deploy%s deploys a new contract, binding an instance of %s to it.\n", kind, kind)
code += fmt.Sprintf("func Deploy%s(auth *bind.TransactOpts, backend bind.ContractBackend %s) (common.Address, *types.Transaction, *%s, error) {\n", kind, arglist, kind)
code += fmt.Sprintf(" parsed, err := abi.JSON(strings.NewReader(%sABI))\n", kind)
code += fmt.Sprintf(" if err != nil {\n")
code += fmt.Sprintf(" return common.Address{}, nil, nil, err\n")
code += fmt.Sprintf(" }\n")
code += fmt.Sprintf(" address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex(%sBin), backend %s)\n", kind, paramlist)
code += fmt.Sprintf(" if err != nil {\n")
code += fmt.Sprintf(" return common.Address{}, nil, nil, err\n")
code += fmt.Sprintf(" }\n")
code += fmt.Sprintf(" return address, tx, &%s{%sCaller: %sCaller{contract: contract}, %sTransactor: %sTransactor{contract: contract}}, nil\n", kind, kind, kind, kind, kind)
code += fmt.Sprintf("}\n\n")
return code
}
// bindMethod
func bindMethod(kind string, method abi.Method) string {
var (
name = strings.ToUpper(method.Name[:1]) + method.Name[1:]
prologue = new(bytes.Buffer)
)
// Generate the argument and return list for the function
args := make([]string, 0, len(method.Inputs))
for i, arg := range method.Inputs {
param := arg.Name
if param == "" {
param = fmt.Sprintf("arg%d", i)
}
args = append(args, fmt.Sprintf("%s %s", param, bindType(arg.Type)))
}
returns, _ := bindReturn(prologue, name, method.Outputs)
// Generate the docs to help with coding against the binding
callTypeDoc := "free data retrieval call"
if !method.Const {
callTypeDoc = "paid mutator transaction"
}
docs := fmt.Sprintf("// %s is a %s binding the contract method 0x%x.\n", name, callTypeDoc, method.Id())
docs += fmt.Sprintf("// \n")
docs += fmt.Sprintf("// Solidity: %s", strings.TrimPrefix(method.String(), "function "))
// Generate the passthrough argument list for sessions
params := make([]string, len(args))
for i, param := range args {
params[i] = strings.Split(param, " ")[0]
}
sessargs := ""
if len(params) > 0 {
sessargs = "," + strings.Join(params, ",")
}
// Generate the method itself for both the read/write version and the combo too
code := fmt.Sprintf("%s\n", prologue)
if method.Const {
// Create the main call implementation
callargs := append([]string{"opts *bind.CallOpts"}, args...)
code += fmt.Sprintf("%s\n", docs)
code += fmt.Sprintf("func (_%s *%sCaller) %s(%s) (%s) {\n", kind, kind, name, strings.Join(callargs, ","), strings.Join(returns, ","))
code += fmt.Sprintf(" %s\n", bindCallBody(kind, method.Name, callargs, returns))
code += fmt.Sprintf("}\n\n")
// Create the wrapping session call implementation
code += fmt.Sprintf("%s\n", docs)
code += fmt.Sprintf("func (_%s *%sSession) %s(%s) (%s) {\n", kind, kind, name, strings.Join(args, ","), strings.Join(returns, ","))
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.CallOpts %s)\n", kind, name, kind, sessargs)
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("%s\n", docs)
code += fmt.Sprintf("func (_%s *%sCallerSession) %s(%s) (%s) {\n", kind, kind, name, strings.Join(args, ","), strings.Join(returns, ","))
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.CallOpts %s)\n", kind, name, kind, sessargs)
code += fmt.Sprintf("}\n\n")
} else {
// Create the main transaction implementation
txargs := append([]string{"opts *bind.TransactOpts"}, args...)
code += fmt.Sprintf("%s\n", docs)
code += fmt.Sprintf("func (_%s *%sTransactor) %s(%s) (*types.Transaction, error) {\n", kind, kind, name, strings.Join(txargs, ","))
code += fmt.Sprintf(" %s\n", bindTransactionBody(kind, method.Name, txargs))
code += fmt.Sprintf("}\n\n")
// Create the wrapping session call implementation
code += fmt.Sprintf("%s\n", docs)
code += fmt.Sprintf("func (_%s *%sSession) %s(%s) (*types.Transaction, error) {\n", kind, kind, name, strings.Join(args, ","))
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.TransactOpts %s)\n", kind, name, kind, sessargs)
code += fmt.Sprintf("}\n\n")
code += fmt.Sprintf("%s\n", docs)
code += fmt.Sprintf("func (_%s *%sTransactorSession) %s(%s) (*types.Transaction, error) {\n", kind, kind, name, strings.Join(args, ","))
code += fmt.Sprintf(" return _%s.Contract.%s(&_%s.TransactOpts %s)\n", kind, name, kind, sessargs)
code += fmt.Sprintf("}\n\n")
}
return code
return string(code), nil
}
// bindType converts a Solidity type to a Go one. Since there is no clear mapping
@ -319,102 +153,21 @@ func bindType(kind abi.Type) string {
}
}
// bindReturn creates the list of return parameters for a method invocation. If
// all the fields of the return type are named, and there is more than one value
// being returned, the returns are wrapped in a result struct.
func bindReturn(prologue *bytes.Buffer, method string, outputs []abi.Argument) ([]string, string) {
// Generate the anonymous return list for when a struct is not needed/possible
var (
returns = make([]string, 0, len(outputs)+1)
anonymous = false
)
for _, ret := range outputs {
returns = append(returns, bindType(ret.Type))
if ret.Name == "" {
anonymous = true
}
}
if anonymous || len(returns) < 2 {
returns = append(returns, "error")
return returns, ""
}
// If the returns are named and numerous, wrap in a result struct
wrapper, impl := bindReturnStruct(method, outputs)
prologue.WriteString(impl + "\n")
return []string{"*" + wrapper, "error"}, wrapper
// capitalise makes the first character of a string upper case.
func capitalise(input string) string {
return strings.ToUpper(input[:1]) + input[1:]
}
// bindReturnStruct creates a Go structure with the specified fields to be used
// as the return type from a method call.
func bindReturnStruct(method string, returns []abi.Argument) (string, string) {
fields := make([]string, 0, len(returns))
for _, ret := range returns {
fields = append(fields, fmt.Sprintf("%s %s", strings.ToUpper(ret.Name[:1])+ret.Name[1:], bindType(ret.Type)))
// structured checks whether a method has enough information to return a proper
// Go struct ot if flat returns are needed.
func structured(method abi.Method) bool {
if len(method.Outputs) < 2 {
return false
}
kind := fmt.Sprintf("%sResult", method)
docs := fmt.Sprintf("// %s is the result of the %s invocation.", kind, method)
return kind, fmt.Sprintf("%s\ntype %s struct {\n%s\n}", docs, kind, strings.Join(fields, "\n"))
for _, out := range method.Outputs {
if out.Name == "" {
return false
}
// bindCallBody creates the Go code to declare a batch of return values, invoke
// an Ethereum method call with the requested parameters, parse the binary output
// into the return values and return them.
func bindCallBody(kind string, method string, params []string, returns []string) string {
body := ""
// Allocate memory for each of the return values
rets := make([]string, 0, len(returns)-1)
if len(returns) > 1 {
body += "var ("
for i, kind := range returns[:len(returns)-1] { // Omit the final error
name := fmt.Sprintf("ret%d", i)
rets = append(rets, name)
body += fmt.Sprintf("%s = new(%s)\n", name, kind)
}
body += ")\n"
}
// Assemble a single collector variable for the result ABI initialization
result := strings.Join(rets, ",")
if len(returns) > 2 {
result = "[]interface{}{" + result + "}"
}
// Extract the parameter list into a flat variable name list
inputs := make([]string, len(params)-1) // Omit the call options
for i, param := range params[1:] {
inputs[i] = strings.Split(param, " ")[0]
}
input := ""
if len(inputs) > 0 {
input = "," + strings.Join(inputs, ",")
}
// Request executing the contract call and return the results with the errors
body += fmt.Sprintf("err := _%s.contract.Call(opts, %s, \"%s\" %s)\n", kind, result, method, input)
outs := make([]string, 0, len(returns))
for _, ret := range rets { // Handle th final error separately
outs = append(outs, "*"+ret)
}
outs = append(outs, "err")
body += fmt.Sprintf("return %s", strings.Join(outs, ","))
return body
}
// bindTransactionBody creates the Go code to invoke an Ethereum transaction call
// with the requested parameters, and return the assembled transaction object.
func bindTransactionBody(kind string, method string, params []string) string {
// Extract the parameter list into a flat variable name list
inputs := make([]string, len(params)-1) // Omit the auth options
for i, param := range params[1:] {
inputs[i] = strings.Split(param, " ")[0]
}
input := ""
if len(inputs) > 0 {
input = "," + strings.Join(inputs, ",")
}
// Request executing the contract call and return the results with the errors
return fmt.Sprintf("return _%s.contract.Transact(opts, \"%s\" %s)", kind, method, input)
return true
}

File diff suppressed because one or more lines are too long

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@ -0,0 +1,212 @@
// 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 "github.com/ethereum/go-ethereum/accounts/abi"
// tmplData is the data structure required to fill the binding template.
type tmplData struct {
Package string // Name of the package to place the generated file in
Contracts map[string]*tmplContract // List of contracts to generate into this file
}
// tmplContract contains the data needed to generate an individual contract binding.
type tmplContract struct {
Type string // Type name of the main contract binding
InputABI string // JSON ABI used as the input to generate the binding from
InputBin string // Optional EVM bytecode used to denetare deploy code from
Constructor abi.Method // Contract constructor for deploy parametrization
Calls map[string]*tmplMethod // Contract calls that only read state data
Transacts map[string]*tmplMethod // Contract calls that write state data
}
// tmplMethod is a wrapper around an abi.Method that contains a few preprocessed
// and cached data fields.
type tmplMethod struct {
Original abi.Method // Original method as parsed by the abi package
Normalized abi.Method // Normalized version of the parsed method (capitalized names, non-anonymous args/returns)
Structured bool // Whether the returns should be accumulated into a contract
}
// tmplSource is the Go source template use to generate the contract binding
// based on.
const tmplSource = `
// This file is an automatically generated Go binding. Do not modify as any
// change will likely be lost upon the next re-generation!
package {{.Package}}
{{range $contract := .Contracts}}
// {{.Type}}ABI is the input ABI used to generate the binding from.
const {{.Type}}ABI = ` + "`" + `{{.InputABI}}` + "`" + `
{{if .InputBin}}
// {{.Type}}Bin is the compiled bytecode used for deploying new contracts.
const {{.Type}}Bin = ` + "`" + `{{.InputBin}}` + "`" + `
// Deploy{{.Type}} deploys a new Ethereum contract, binding an instance of {{.Type}} to it.
func Deploy{{.Type}}(auth *bind.TransactOpts, backend bind.ContractBackend {{range .Constructor.Inputs}}, {{.Name}} {{bindtype .Type}}{{end}}) (common.Address, *types.Transaction, *{{.Type}}, error) {
parsed, err := abi.JSON(strings.NewReader({{.Type}}ABI))
if err != nil {
return common.Address{}, nil, nil, err
}
address, tx, contract, err := bind.DeployContract(auth, parsed, common.FromHex({{.Type}}Bin), backend {{range .Constructor.Inputs}}, {{.Name}}{{end}})
if err != nil {
return common.Address{}, nil, nil, err
}
return address, tx, &{{.Type}}{ {{.Type}}Caller: {{.Type}}Caller{contract: contract}, {{.Type}}Transactor: {{.Type}}Transactor{contract: contract} }, nil
}
{{end}}
// {{.Type}} is an auto generated Go binding around an Ethereum contract.
type {{.Type}} struct {
{{.Type}}Caller // Read-only binding to the contract
{{.Type}}Transactor // Write-only binding to the contract
}
// {{.Type}}Caller is an auto generated read-only Go binding around an Ethereum contract.
type {{.Type}}Caller struct {
contract *bind.BoundContract // Generic contract wrapper for the low level calls
}
// {{.Type}}Transactor is an auto generated write-only Go binding around an Ethereum contract.
type {{.Type}}Transactor struct {
contract *bind.BoundContract // Generic contract wrapper for the low level calls
}
// {{.Type}}Session is an auto generated Go binding around an Ethereum contract,
// with pre-set call and transact options.
type {{.Type}}Session struct {
Contract *{{.Type}} // Generic contract binding to set the session for
CallOpts bind.CallOpts // Call options to use throughout this session
TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
}
// {{.Type}}CallerSession is an auto generated read-only Go binding around an Ethereum contract,
// with pre-set call options.
type {{.Type}}CallerSession struct {
Contract *{{.Type}}Caller // Generic contract caller binding to set the session for
CallOpts bind.CallOpts // Call options to use throughout this session
}
// {{.Type}}TransactorSession is an auto generated write-only Go binding around an Ethereum contract,
// with pre-set transact options.
type {{.Type}}TransactorSession struct {
Contract *{{.Type}}Transactor // Generic contract transactor binding to set the session for
TransactOpts bind.TransactOpts // Transaction auth options to use throughout this session
}
// New{{.Type}} creates a new instance of {{.Type}}, bound to a specific deployed contract.
func New{{.Type}}(address common.Address, backend bind.ContractBackend) (*{{.Type}}, error) {
contract, err := bind{{.Type}}(address, backend.(bind.ContractCaller), backend.(bind.ContractTransactor))
if err != nil {
return nil, err
}
return &{{.Type}}{ {{.Type}}Caller: {{.Type}}Caller{contract: contract}, {{.Type}}Transactor: {{.Type}}Transactor{contract: contract} }, nil
}
// New{{.Type}}Caller creates a new read-only instance of {{.Type}}, bound to a specific deployed contract.
func New{{.Type}}Caller(address common.Address, caller bind.ContractCaller) (*{{.Type}}Caller, error) {
contract, err := bind{{.Type}}(address, caller, nil)
if err != nil {
return nil, err
}
return &{{.Type}}Caller{contract: contract}, nil
}
// New{{.Type}}Transactor creates a new write-only instance of {{.Type}}, bound to a specific deployed contract.
func New{{.Type}}Transactor(address common.Address, transactor bind.ContractTransactor) (*{{.Type}}Transactor, error) {
contract, err := bind{{.Type}}(address, nil, transactor)
if err != nil {
return nil, err
}
return &{{.Type}}Transactor{contract: contract}, nil
}
// bind{{.Type}} binds a generic wrapper to an already deployed contract.
func bind{{.Type}}(address common.Address, caller bind.ContractCaller, transactor bind.ContractTransactor) (*bind.BoundContract, error) {
parsed, err := abi.JSON(strings.NewReader({{.Type}}ABI))
if err != nil {
return nil, err
}
return bind.NewBoundContract(address, parsed, caller, transactor), nil
}
{{range .Calls}}
{{if .Structured}}
// {{.Normalized.Name}}Result is the result of the {{.Normalized.Name}} invocation."
type {{.Normalized.Name}}Result struct {
{{range .Normalized.Outputs}}{{.Name}} {{bindtype .Type}}
{{end}}
}
{{end}}
// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
//
// Solidity: {{.Original.String}}
func (_{{$contract.Type}} *{{$contract.Type}}Caller) {{.Normalized.Name}}(opts *bind.CallOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}*{{.Normalized.Name}}Result,{{else}}{{range .Normalized.Outputs}}{{bindtype .Type}},{{end}}{{end}} error) {
var (
{{if .Structured}}ret = new(*{{.Normalized.Name}}Result){{else}}{{range $i, $_ := .Normalized.Outputs}}ret{{$i}} = new({{bindtype .Type}})
{{end}}{{end}}
)
out := {{if .Structured}}ret{{else}}{{if eq (len .Normalized.Outputs) 1}}ret0{{else}}[]interface{}{
{{range $i, $_ := .Normalized.Outputs}}ret{{$i}},
{{end}}
}{{end}}{{end}}
err := _{{$contract.Type}}.contract.Call(opts, out, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}})
return {{if .Structured}}*ret,{{else}}{{range $i, $_ := .Normalized.Outputs}}*ret{{$i}},{{end}}{{end}} err
}
// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
//
// Solidity: {{.Original.String}}
func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}*{{.Normalized.Name}}Result, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
}
// {{.Normalized.Name}} is a free data retrieval call binding the contract method 0x{{printf "%x" .Original.Id}}.
//
// Solidity: {{.Original.String}}
func (_{{$contract.Type}} *{{$contract.Type}}CallerSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) ({{if .Structured}}*{{.Normalized.Name}}Result, {{else}} {{range .Normalized.Outputs}}{{bindtype .Type}},{{end}} {{end}} error) {
return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.CallOpts {{range .Normalized.Inputs}}, {{.Name}}{{end}})
}
{{end}}
{{range .Transacts}}
// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.Id}}.
//
// Solidity: {{.Original.String}}
func (_{{$contract.Type}} *{{$contract.Type}}Transactor) {{.Normalized.Name}}(opts *bind.TransactOpts {{range .Normalized.Inputs}}, {{.Name}} {{bindtype .Type}} {{end}}) (*types.Transaction, error) {
return _{{$contract.Type}}.contract.Transact(opts, "{{.Original.Name}}" {{range .Normalized.Inputs}}, {{.Name}}{{end}})
}
// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.Id}}.
//
// Solidity: {{.Original.String}}
func (_{{$contract.Type}} *{{$contract.Type}}Session) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) (*types.Transaction, error) {
return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}})
}
// {{.Normalized.Name}} is a paid mutator transaction binding the contract method 0x{{printf "%x" .Original.Id}}.
//
// Solidity: {{.Original.String}}
func (_{{$contract.Type}} *{{$contract.Type}}TransactorSession) {{.Normalized.Name}}({{range $i, $_ := .Normalized.Inputs}}{{if ne $i 0}},{{end}} {{.Name}} {{bindtype .Type}} {{end}}) (*types.Transaction, error) {
return _{{$contract.Type}}.Contract.{{.Normalized.Name}}(&_{{$contract.Type}}.TransactOpts {{range $i, $_ := .Normalized.Inputs}}, {{.Name}}{{end}})
}
{{end}}
{{end}}
`

View File

@ -17,40 +17,80 @@
package main
import (
"encoding/json"
"flag"
"fmt"
"io/ioutil"
"os"
"github.com/ethereum/go-ethereum/accounts/abi/bind"
"github.com/ethereum/go-ethereum/common/compiler"
)
var (
abiFlag = flag.String("abi", "", "Path to the Ethereum contract ABI json to bind")
binFlag = flag.String("bin", "", "Path to the Ethereum contract bytecode (generate deploy method)")
pkgFlag = flag.String("pkg", "", "Go package name to generate the binding into")
typFlag = flag.String("type", "", "Go struct name for the binding (default = package name)")
outFlag = flag.String("out", "", "Output path for the generated binding (default = stdout)")
solFlag = flag.String("sol", "", "Path to the Ethereum contract Solidity source to build and bind")
solcFlag = flag.String("solc", "solc", "Solidity compiler to use if source builds are requested")
pkgFlag = flag.String("pkg", "", "Go package name to generate the binding into")
outFlag = flag.String("out", "", "Output file for the generated binding (default = stdout)")
)
func main() {
// Parse and validate the command line flags
// Parse and ensure all needed inputs are specified
flag.Parse()
if *abiFlag == "" {
fmt.Printf("No contract ABI path specified (--abi)\n")
if *abiFlag == "" && *solFlag == "" {
fmt.Printf("No contract ABI (--abi) or Solidity source (--sol) specified\n")
os.Exit(-1)
} else if (*abiFlag != "" || *binFlag != "" || *typFlag != "") && *solFlag != "" {
fmt.Printf("Contract ABI (--abi), bytecode (--bin) and type (--type) flags are mutually exclusive with the Solidity source (--sol) flag\n")
os.Exit(-1)
}
if *pkgFlag == "" {
fmt.Printf("No destination Go package specified (--pkg)\n")
os.Exit(-1)
}
// Read the ABI json from disk and optionally the contract bytecode too
// If the entire solidity code was specified, build and bind based on that
var (
abis []string
bins []string
types []string
)
if *solFlag != "" {
solc, err := compiler.New(*solcFlag)
if err != nil {
fmt.Printf("Failed to locate Solidity compiler: %v\n", err)
os.Exit(-1)
}
source, err := ioutil.ReadFile(*solFlag)
if err != nil {
fmt.Printf("Failed to read Soldity source code: %v\n", err)
os.Exit(-1)
}
contracts, err := solc.Compile(string(source))
if err != nil {
fmt.Printf("Failed to build Solidity contract: %v\n", err)
os.Exit(-1)
}
for name, contract := range contracts {
abi, _ := json.Marshal(contract.Info.AbiDefinition) // Flatten the compiler parse
abis = append(abis, string(abi))
bins = append(bins, contract.Code)
types = append(types, name)
}
} else {
// Otherwise load up the ABI, optional bytecode and type name from the parameters
abi, err := ioutil.ReadFile(*abiFlag)
if err != nil {
fmt.Printf("Failed to read input ABI: %v\n", err)
os.Exit(-1)
}
abis = append(abis, string(abi))
bin := []byte{}
if *binFlag != "" {
if bin, err = ioutil.ReadFile(*binFlag); err != nil {
@ -58,12 +98,16 @@ func main() {
os.Exit(-1)
}
}
// Generate the contract binding
bins = append(bins, string(bin))
kind := *typFlag
if kind == "" {
kind = *pkgFlag
}
code, err := bind.Bind(string(abi), string(bin), *pkgFlag, kind)
types = append(types, kind)
}
// Generate the contract binding
code, err := bind.Bind(types, abis, bins, *pkgFlag)
if err != nil {
fmt.Printf("Failed to generate ABI binding: %v\n", err)
os.Exit(-1)