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