neoneo-go/pkg/smartcontract/rpcbinding/binding.go
2022-11-14 13:01:13 +03:00

448 lines
16 KiB
Go

package rpcbinding
import (
"fmt"
"sort"
"text/template"
"github.com/nspcc-dev/neo-go/pkg/smartcontract"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/binding"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest"
"github.com/nspcc-dev/neo-go/pkg/smartcontract/manifest/standard"
)
const srcTmpl = `
{{- define "SAFEMETHOD" -}}
// {{.Name}} {{.Comment}}
func (c *ContractReader) {{.Name}}({{range $index, $arg := .Arguments -}}
{{- if ne $index 0}}, {{end}}
{{- .Name}} {{.Type}}
{{- end}}) {{if .ReturnType }}({{ .ReturnType }}, error) {
return unwrap.{{.CallFlag}}(c.invoker.Call(Hash, "{{ .NameABI }}"{{/* CallFlag field is used for function name */}}
{{- range $arg := .Arguments -}}, {{.Name}}{{end}}))
{{- else -}} (*result.Invoke, error) {
c.invoker.Call(Hash, "{{ .NameABI }}"
{{- range $arg := .Arguments -}}, {{.Name}}{{end}})
{{- end}}
}
{{- if eq .CallFlag "SessionIterator"}}
// {{.Name}}Expanded is similar to {{.Name}} (uses the same contract
// method), but can be useful if the server used doesn't support sessions and
// doesn't expand iterators. It creates a script that will get the specified
// number of result items from the iterator right in the VM and return them to
// you. It's only limited by VM stack and GAS available for RPC invocations.
func (c *ContractReader) {{.Name}}Expanded({{range $index, $arg := .Arguments}}{{.Name}} {{.Type}}, {{end}}_numOfIteratorItems int) ([]stackitem.Item, error) {
return unwrap.Array(c.invoker.CallAndExpandIterator(Hash, "{{.NameABI}}", _numOfIteratorItems{{range $arg := .Arguments}}, {{.Name}}{{end}}))
}
{{- end -}}
{{- end -}}
{{- define "METHOD" -}}
{{- if eq .ReturnType "bool"}}func scriptFor{{.Name}}({{range $index, $arg := .Arguments -}}
{{- if ne $index 0}}, {{end}}
{{- .Name}} {{.Type}}
{{- end}}) ([]byte, error) {
return smartcontract.CreateCallWithAssertScript(Hash, "{{ .NameABI }}"{{- range $index, $arg := .Arguments -}}, {{.Name}}{{end}})
}
{{end}}// {{.Name}} {{.Comment}}
// This transaction is signed and immediately sent to the network.
// The values returned are its hash, ValidUntilBlock value and error if any.
func (c *Contract) {{.Name}}({{range $index, $arg := .Arguments -}}
{{- if ne $index 0}}, {{end}}
{{- .Name}} {{.Type}}
{{- end}}) (util.Uint256, uint32, error) {
{{if ne .ReturnType "bool"}}return c.actor.SendCall(Hash, "{{ .NameABI }}"
{{- range $index, $arg := .Arguments -}}, {{.Name}}{{end}}){{else}}script, err := scriptFor{{.Name}}({{- range $index, $arg := .Arguments -}}{{- if ne $index 0}}, {{end}}{{.Name}}{{end}})
if err != nil {
return util.Uint256{}, 0, err
}
return c.actor.SendRun(script){{end}}
}
// {{.Name}}Transaction {{.Comment}}
// This transaction is signed, but not sent to the network, instead it's
// returned to the caller.
func (c *Contract) {{.Name}}Transaction({{range $index, $arg := .Arguments -}}
{{- if ne $index 0}}, {{end}}
{{- .Name}} {{.Type}}
{{- end}}) (*transaction.Transaction, error) {
{{if ne .ReturnType "bool"}}return c.actor.MakeCall(Hash, "{{ .NameABI }}"
{{- range $index, $arg := .Arguments -}}, {{.Name}}{{end}}){{else}}script, err := scriptFor{{.Name}}({{- range $index, $arg := .Arguments -}}{{- if ne $index 0}}, {{end}}{{.Name}}{{end}})
if err != nil {
return nil, err
}
return c.actor.MakeRun(script){{end}}
}
// {{.Name}}Unsigned {{.Comment}}
// This transaction is not signed, it's simply returned to the caller.
// Any fields of it that do not affect fees can be changed (ValidUntilBlock,
// Nonce), fee values (NetworkFee, SystemFee) can be increased as well.
func (c *Contract) {{.Name}}Unsigned({{range $index, $arg := .Arguments -}}
{{- if ne $index 0}}, {{end}}
{{- .Name}} {{.Type}}
{{- end}}) (*transaction.Transaction, error) {
{{if ne .ReturnType "bool"}}return c.actor.MakeUnsignedCall(Hash, "{{ .NameABI }}", nil
{{- range $index, $arg := .Arguments -}}, {{.Name}}{{end}}){{else}}script, err := scriptFor{{.Name}}({{- range $index, $arg := .Arguments -}}{{- if ne $index 0}}, {{end}}{{.Name}}{{end}})
if err != nil {
return nil, err
}
return c.actor.MakeUnsignedRun(script, nil){{end}}
}
{{- end -}}
// Package {{.PackageName}} contains RPC wrappers for {{.ContractName}} contract.
package {{.PackageName}}
import (
{{range $m := .Imports}} "{{ $m }}"
{{end}})
// Hash contains contract hash.
var Hash = {{ .Hash }}
{{if .HasReader}}// Invoker is used by ContractReader to call various safe methods.
type Invoker interface {
{{if or .IsNep11D .IsNep11ND}} nep11.Invoker
{{else -}}
{{ if .IsNep17}} nep17.Invoker
{{else if len .SafeMethods}} Call(contract util.Uint160, operation string, params ...interface{}) (*result.Invoke, error)
{{end -}}
{{if .HasIterator}} CallAndExpandIterator(contract util.Uint160, method string, maxItems int, params ...interface{}) (*result.Invoke, error)
TerminateSession(sessionID uuid.UUID) error
TraverseIterator(sessionID uuid.UUID, iterator *result.Iterator, num int) ([]stackitem.Item, error)
{{end -}}
{{end -}}
}
{{end -}}
{{if .HasWriter}}// Actor is used by Contract to call state-changing methods.
type Actor interface {
{{- if .HasReader}}
Invoker
{{end}}
{{- if or .IsNep11D .IsNep11ND}}
nep11.Actor
{{else if .IsNep17}}
nep17.Actor
{{end}}
{{- if len .Methods}}
MakeCall(contract util.Uint160, method string, params ...interface{}) (*transaction.Transaction, error)
MakeRun(script []byte) (*transaction.Transaction, error)
MakeUnsignedCall(contract util.Uint160, method string, attrs []transaction.Attribute, params ...interface{}) (*transaction.Transaction, error)
MakeUnsignedRun(script []byte, attrs []transaction.Attribute) (*transaction.Transaction, error)
SendCall(contract util.Uint160, method string, params ...interface{}) (util.Uint256, uint32, error)
SendRun(script []byte) (util.Uint256, uint32, error)
{{end -}}
}
{{end -}}
{{if .HasReader}}// ContractReader implements safe contract methods.
type ContractReader struct {
{{if .IsNep11D}}nep11.DivisibleReader
{{end -}}
{{if .IsNep11ND}}nep11.NonDivisibleReader
{{end -}}
{{if .IsNep17}}nep17.TokenReader
{{end -}}
invoker Invoker
}
{{end -}}
{{if .HasWriter}}// Contract implements all contract methods.
type Contract struct {
{{if .HasReader}}ContractReader
{{end -}}
{{if .IsNep11D}}nep11.DivisibleWriter
{{end -}}
{{if .IsNep11ND}}nep11.BaseWriter
{{end -}}
{{if .IsNep17}}nep17.TokenWriter
{{end -}}
actor Actor
}
{{end -}}
{{if .HasReader}}// NewReader creates an instance of ContractReader using Hash and the given Invoker.
func NewReader(invoker Invoker) *ContractReader {
return &ContractReader{
{{- if .IsNep11D}}*nep11.NewDivisibleReader(invoker, Hash), {{end}}
{{- if .IsNep11ND}}*nep11.NewNonDivisibleReader(invoker, Hash), {{end}}
{{- if .IsNep17}}*nep17.NewReader(invoker, Hash), {{end -}}
invoker}
}
{{end -}}
{{if .HasWriter}}// New creates an instance of Contract using Hash and the given Actor.
func New(actor Actor) *Contract {
{{if .IsNep11D}}var nep11dt = nep11.NewDivisible(actor, Hash)
{{end -}}
{{if .IsNep11ND}}var nep11ndt = nep11.NewNonDivisible(actor, Hash)
{{end -}}
{{if .IsNep17}}var nep17t = nep17.New(actor, Hash)
{{end -}}
return &Contract{
{{- if .HasReader}}ContractReader{
{{- if .IsNep11D}}nep11dt.DivisibleReader, {{end -}}
{{- if .IsNep11ND}}nep11ndt.NonDivisibleReader, {{end -}}
{{- if .IsNep17}}nep17t.TokenReader, {{end -}}
actor}, {{end -}}
{{- if .IsNep11D}}nep11dt.DivisibleWriter, {{end -}}
{{- if .IsNep11ND}}nep11ndt.BaseWriter, {{end -}}
{{- if .IsNep17}}nep17t.TokenWriter, {{end -}}
actor}
}
{{end -}}
{{range $m := .SafeMethods}}
{{template "SAFEMETHOD" $m }}
{{end}}
{{- range $m := .Methods}}
{{template "METHOD" $m }}
{{end}}`
var srcTemplate = template.Must(template.New("generate").Parse(srcTmpl))
type (
ContractTmpl struct {
binding.ContractTmpl
SafeMethods []binding.MethodTmpl
IsNep11D bool
IsNep11ND bool
IsNep17 bool
HasReader bool
HasWriter bool
HasIterator bool
}
)
// NewConfig initializes and returns a new config instance.
func NewConfig() binding.Config {
return binding.NewConfig()
}
// Generate writes Go file containing smartcontract bindings to the `cfg.Output`.
// It doesn't check manifest from Config for validity, incorrect manifest can
// lead to unexpected results.
func Generate(cfg binding.Config) error {
// Avoid changing *cfg.Manifest.
mfst := *cfg.Manifest
mfst.ABI.Methods = make([]manifest.Method, len(mfst.ABI.Methods))
copy(mfst.ABI.Methods, cfg.Manifest.ABI.Methods)
cfg.Manifest = &mfst
var imports = make(map[string]struct{})
var ctr ContractTmpl
// Strip standard methods from NEP-XX packages.
for _, std := range cfg.Manifest.SupportedStandards {
if std == manifest.NEP11StandardName {
imports["github.com/nspcc-dev/neo-go/pkg/rpcclient/nep11"] = struct{}{}
if standard.ComplyABI(cfg.Manifest, standard.Nep11Divisible) == nil {
mfst.ABI.Methods = dropStdMethods(mfst.ABI.Methods, standard.Nep11Divisible)
ctr.IsNep11D = true
} else if standard.ComplyABI(cfg.Manifest, standard.Nep11NonDivisible) == nil {
mfst.ABI.Methods = dropStdMethods(mfst.ABI.Methods, standard.Nep11NonDivisible)
ctr.IsNep11ND = true
}
break // Can't be NEP-17 at the same time.
}
if std == manifest.NEP17StandardName && standard.ComplyABI(cfg.Manifest, standard.Nep17) == nil {
mfst.ABI.Methods = dropStdMethods(mfst.ABI.Methods, standard.Nep17)
imports["github.com/nspcc-dev/neo-go/pkg/rpcclient/nep17"] = struct{}{}
ctr.IsNep17 = true
break // Can't be NEP-11 at the same time.
}
}
// OnNepXXPayment handlers normally can't be called directly.
if standard.ComplyABI(cfg.Manifest, standard.Nep11Payable) == nil {
mfst.ABI.Methods = dropStdMethods(mfst.ABI.Methods, standard.Nep11Payable)
}
if standard.ComplyABI(cfg.Manifest, standard.Nep17Payable) == nil {
mfst.ABI.Methods = dropStdMethods(mfst.ABI.Methods, standard.Nep17Payable)
}
ctr.ContractTmpl = binding.TemplateFromManifest(cfg, scTypeToGo)
ctr = scTemplateToRPC(cfg, ctr, imports)
return srcTemplate.Execute(cfg.Output, ctr)
}
func dropManifestMethods(meths []manifest.Method, manifested []manifest.Method) []manifest.Method {
for _, m := range manifested {
for i := 0; i < len(meths); i++ {
if meths[i].Name == m.Name && len(meths[i].Parameters) == len(m.Parameters) {
meths = append(meths[:i], meths[i+1:]...)
i--
}
}
}
return meths
}
func dropStdMethods(meths []manifest.Method, std *standard.Standard) []manifest.Method {
meths = dropManifestMethods(meths, std.Manifest.ABI.Methods)
if std.Optional != nil {
meths = dropManifestMethods(meths, std.Optional)
}
if std.Base != nil {
return dropStdMethods(meths, std.Base)
}
return meths
}
func scTypeToGo(name string, typ smartcontract.ParamType, overrides map[string]binding.Override) (string, string) {
over, ok := overrides[name]
if ok {
switch over.TypeName {
case "[]bool":
return "[]bool", ""
case "[]int", "[]uint", "[]int8", "[]uint8", "[]int16",
"[]uint16", "[]int32", "[]uint32", "[]int64", "[]uint64":
return "[]*big.Int", "math/big"
case "[][]byte":
return "[][]byte", ""
case "[]string":
return "[]string", ""
case "[]interop.Hash160":
return "[]util.Uint160", "github.com/nspcc-dev/neo-go/pkg/util"
case "[]interop.Hash256":
return "[]util.Uint256", "github.com/nspcc-dev/neo-go/pkg/util"
case "[]interop.PublicKey":
return "keys.PublicKeys", "github.com/nspcc-dev/neo-go/pkg/crypto/keys"
case "[]interop.Signature":
return "[][]byte", ""
}
}
switch typ {
case smartcontract.AnyType:
return "interface{}", ""
case smartcontract.BoolType:
return "bool", ""
case smartcontract.IntegerType:
return "*big.Int", "math/big"
case smartcontract.ByteArrayType:
return "[]byte", ""
case smartcontract.StringType:
return "string", ""
case smartcontract.Hash160Type:
return "util.Uint160", "github.com/nspcc-dev/neo-go/pkg/util"
case smartcontract.Hash256Type:
return "util.Uint256", "github.com/nspcc-dev/neo-go/pkg/util"
case smartcontract.PublicKeyType:
return "*keys.PublicKey", "github.com/nspcc-dev/neo-go/pkg/crypto/keys"
case smartcontract.SignatureType:
return "[]byte", ""
case smartcontract.ArrayType:
return "[]interface{}", ""
case smartcontract.MapType:
return "*stackitem.Map", "github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
case smartcontract.InteropInterfaceType:
return "interface{}", ""
case smartcontract.VoidType:
return "", ""
default:
panic("unreachable")
}
}
func scTemplateToRPC(cfg binding.Config, ctr ContractTmpl, imports map[string]struct{}) ContractTmpl {
for i := range ctr.Imports {
imports[ctr.Imports[i]] = struct{}{}
}
ctr.Hash = fmt.Sprintf("%#v", cfg.Hash)
for i := 0; i < len(ctr.Methods); i++ {
abim := cfg.Manifest.ABI.GetMethod(ctr.Methods[i].NameABI, len(ctr.Methods[i].Arguments))
if abim.Safe {
ctr.SafeMethods = append(ctr.SafeMethods, ctr.Methods[i])
ctr.Methods = append(ctr.Methods[:i], ctr.Methods[i+1:]...)
i--
} else {
ctr.Methods[i].Comment = fmt.Sprintf("creates a transaction invoking `%s` method of the contract.", ctr.Methods[i].NameABI)
if ctr.Methods[i].ReturnType == "bool" {
imports["github.com/nspcc-dev/neo-go/pkg/smartcontract"] = struct{}{}
}
}
}
// We're misusing CallFlag field for function name here.
for i := range ctr.SafeMethods {
switch ctr.SafeMethods[i].ReturnType {
case "interface{}":
abim := cfg.Manifest.ABI.GetMethod(ctr.SafeMethods[i].NameABI, len(ctr.SafeMethods[i].Arguments))
if abim.ReturnType == smartcontract.InteropInterfaceType {
imports["github.com/google/uuid"] = struct{}{}
imports["github.com/nspcc-dev/neo-go/pkg/vm/stackitem"] = struct{}{}
imports["github.com/nspcc-dev/neo-go/pkg/neorpc/result"] = struct{}{}
ctr.SafeMethods[i].ReturnType = "uuid.UUID, result.Iterator"
ctr.SafeMethods[i].CallFlag = "SessionIterator"
ctr.HasIterator = true
} else {
imports["github.com/nspcc-dev/neo-go/pkg/vm/stackitem"] = struct{}{}
ctr.SafeMethods[i].ReturnType = "stackitem.Item"
ctr.SafeMethods[i].CallFlag = "Item"
}
case "bool":
ctr.SafeMethods[i].CallFlag = "Bool"
case "*big.Int":
ctr.SafeMethods[i].CallFlag = "BigInt"
case "string":
ctr.SafeMethods[i].CallFlag = "UTF8String"
case "util.Uint160":
ctr.SafeMethods[i].CallFlag = "Uint160"
case "util.Uint256":
ctr.SafeMethods[i].CallFlag = "Uint256"
case "*keys.PublicKey":
ctr.SafeMethods[i].CallFlag = "PublicKey"
case "[]byte":
ctr.SafeMethods[i].CallFlag = "Bytes"
case "[]interface{}":
imports["github.com/nspcc-dev/neo-go/pkg/vm/stackitem"] = struct{}{}
ctr.SafeMethods[i].ReturnType = "[]stackitem.Item"
ctr.SafeMethods[i].CallFlag = "Array"
case "*stackitem.Map":
ctr.SafeMethods[i].CallFlag = "Map"
case "[]bool":
ctr.SafeMethods[i].CallFlag = "ArrayOfBools"
case "[]*big.Int":
ctr.SafeMethods[i].CallFlag = "ArrayOfBigInts"
case "[][]byte":
ctr.SafeMethods[i].CallFlag = "ArrayOfBytes"
case "[]string":
ctr.SafeMethods[i].CallFlag = "ArrayOfUTF8Strings"
case "[]util.Uint160":
ctr.SafeMethods[i].CallFlag = "ArrayOfUint160"
case "[]util.Uint256":
ctr.SafeMethods[i].CallFlag = "ArrayOfUint256"
case "keys.PublicKeys":
ctr.SafeMethods[i].CallFlag = "ArrayOfPublicKeys"
}
}
imports["github.com/nspcc-dev/neo-go/pkg/util"] = struct{}{}
if len(ctr.SafeMethods) > 0 {
imports["github.com/nspcc-dev/neo-go/pkg/rpcclient/unwrap"] = struct{}{}
if !(ctr.IsNep17 || ctr.IsNep11D || ctr.IsNep11ND) {
imports["github.com/nspcc-dev/neo-go/pkg/neorpc/result"] = struct{}{}
}
}
if len(ctr.Methods) > 0 {
imports["github.com/nspcc-dev/neo-go/pkg/core/transaction"] = struct{}{}
}
if len(ctr.Methods) > 0 || ctr.IsNep17 || ctr.IsNep11D || ctr.IsNep11ND {
ctr.HasWriter = true
}
if len(ctr.SafeMethods) > 0 || ctr.IsNep17 || ctr.IsNep11D || ctr.IsNep11ND {
ctr.HasReader = true
}
ctr.Imports = ctr.Imports[:0]
for imp := range imports {
ctr.Imports = append(ctr.Imports, imp)
}
sort.Strings(ctr.Imports)
return ctr
}