rpcbinding: support writer-only wrappers

"verify" contract doesn't have any safe methods.

cli/smartcontract/generate_test.go

@@ -357,6 +357,9 @@ func TestGenerateRPCBindings(t *testing.T) {
 	checkBinding(filepath.Join("testdata", "gas", "gas.manifest.json"),
 		"0xd2a4cff31913016155e38e474a2c06d08be276cf",
 		filepath.Join("testdata", "gas", "gas.go"))
+	checkBinding(filepath.Join("testdata", "verify.manifest.json"),
+		"0x00112233445566778899aabbccddeeff00112233",
+		filepath.Join("testdata", "verifyrpc", "verify.go"))
 }
 
 func TestGenerate_Errors(t *testing.T) {

cli/smartcontract/testdata/gas/gas.go

@@ -17,6 +17,7 @@ type Invoker interface {
 // Actor is used by Contract to call state-changing methods.
 type Actor interface {
 	Invoker
+
 	nep17.Actor
 }
 
@@ -41,6 +42,6 @@ func NewReader(invoker Invoker) *ContractReader {
 // New creates an instance of Contract using Hash and the given Actor.
 func New(actor Actor) *Contract {
 	var nep17t = nep17.New(actor, Hash)
-	return &Contract{ContractReader{nep17t.TokenReader, actor},nep17t.TokenWriter, actor}
+	return &Contract{ContractReader{nep17t.TokenReader, actor}, nep17t.TokenWriter, actor}
 }
 

cli/smartcontract/testdata/nameservice/nns.go

@@ -22,6 +22,7 @@ type Invoker interface {
 // Actor is used by Contract to call state-changing methods.
 type Actor interface {
 	Invoker
+
 	nep11.Actor
 
 	MakeCall(contract util.Uint160, method string, params ...interface{}) (*transaction.Transaction, error)
@@ -53,7 +54,7 @@ func NewReader(invoker Invoker) *ContractReader {
 // New creates an instance of Contract using Hash and the given Actor.
 func New(actor Actor) *Contract {
 	var nep11ndt = nep11.NewNonDivisible(actor, Hash)
-	return &Contract{ContractReader{nep11ndt.NonDivisibleReader, actor},nep11ndt.BaseWriter, actor}
+	return &Contract{ContractReader{nep11ndt.NonDivisibleReader, actor}, nep11ndt.BaseWriter, actor}
 }
 
 

cli/smartcontract/testdata/nex/nex.go

@@ -21,7 +21,9 @@ type Invoker interface {
 // Actor is used by Contract to call state-changing methods.
 type Actor interface {
 	Invoker
+
 	nep17.Actor
+
 	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)
@@ -51,7 +53,7 @@ func NewReader(invoker Invoker) *ContractReader {
 // New creates an instance of Contract using Hash and the given Actor.
 func New(actor Actor) *Contract {
 	var nep17t = nep17.New(actor, Hash)
-	return &Contract{ContractReader{nep17t.TokenReader, actor},nep17t.TokenWriter, actor}
+	return &Contract{ContractReader{nep17t.TokenReader, actor}, nep17t.TokenWriter, actor}
 }
 
 

cli/smartcontract/testdata/verifyrpc/verify.go

@@ -0,0 +1,93 @@
+// Package verify contains RPC wrappers for verify contract.
+package verify
+
+import (
+	"github.com/nspcc-dev/neo-go/pkg/core/transaction"
+	"github.com/nspcc-dev/neo-go/pkg/smartcontract"
+	"github.com/nspcc-dev/neo-go/pkg/util"
+	"math/big"
+)
+
+// Hash contains contract hash.
+var Hash = util.Uint160{0x33, 0x22, 0x11, 0x0, 0xff, 0xee, 0xdd, 0xcc, 0xbb, 0xaa, 0x99, 0x88, 0x77, 0x66, 0x55, 0x44, 0x33, 0x22, 0x11, 0x0}
+
+// Actor is used by Contract to call state-changing methods.
+type Actor interface {
+	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)
+}
+
+// Contract implements all contract methods.
+type Contract struct {
+	actor Actor
+}
+
+// New creates an instance of Contract using Hash and the given Actor.
+func New(actor Actor) *Contract {
+	return &Contract{actor}
+}
+
+
+func scriptForVerify() ([]byte, error) {
+	return smartcontract.CreateCallWithAssertScript(Hash, "verify")
+}
+
+// Verify creates a transaction invoking `verify` method of the contract.
+// 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) Verify() (util.Uint256, uint32, error) {
+	script, err := scriptForVerify()
+	if err != nil {
+		return util.Uint256{}, 0, err
+	}
+	return c.actor.SendRun(script)
+}
+
+// VerifyTransaction creates a transaction invoking `verify` method of the contract.
+// This transaction is signed, but not sent to the network, instead it's
+// returned to the caller.
+func (c *Contract) VerifyTransaction() (*transaction.Transaction, error) {
+	script, err := scriptForVerify()
+	if err != nil {
+		return nil, err
+	}
+	return c.actor.MakeRun(script)
+}
+
+// VerifyUnsigned creates a transaction invoking `verify` method of the contract.
+// 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) VerifyUnsigned() (*transaction.Transaction, error) {
+	script, err := scriptForVerify()
+	if err != nil {
+		return nil, err
+	}
+	return c.actor.MakeUnsignedRun(script, nil)
+}
+
+// OnNEP17Payment creates a transaction invoking `onNEP17Payment` method of the contract.
+// 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) OnNEP17Payment(from []byte, amount *big.Int, data interface{}) (util.Uint256, uint32, error) {
+	return c.actor.SendCall(Hash, "onNEP17Payment", from, amount, data)
+}
+
+// OnNEP17PaymentTransaction creates a transaction invoking `onNEP17Payment` method of the contract.
+// This transaction is signed, but not sent to the network, instead it's
+// returned to the caller.
+func (c *Contract) OnNEP17PaymentTransaction(from []byte, amount *big.Int, data interface{}) (*transaction.Transaction, error) {
+	return c.actor.MakeCall(Hash, "onNEP17Payment", from, amount, data)
+}
+
+// OnNEP17PaymentUnsigned creates a transaction invoking `onNEP17Payment` method of the contract.
+// 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) OnNEP17PaymentUnsigned(from []byte, amount *big.Int, data interface{}) (*transaction.Transaction, error) {
+	return c.actor.MakeUnsignedCall(Hash, "onNEP17Payment", nil, from, amount, data)
+}

pkg/smartcontract/rpcbinding/binding.go

@@ -90,7 +90,7 @@ import (
 // Hash contains contract hash.
 var Hash = {{ .Hash }}
 
-// Invoker is used by ContractReader to call various safe methods.
+{{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
@@ -98,12 +98,19 @@ type Invoker interface {
 {{end -}}
 }
 
+{{end -}}
 {{if .HasWriter}}// Actor is used by Contract to call state-changing methods.
 type Actor interface {
+{{- if .HasReader}}
 	Invoker
-{{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)
+{{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)
@@ -113,7 +120,7 @@ type Actor interface {
 }
 
 {{end -}}
-// ContractReader implements safe contract methods.
+{{if .HasReader}}// ContractReader implements safe contract methods.
 type ContractReader struct {
 	{{if .IsNep11D}}nep11.DivisibleReader
 	{{end -}}
@@ -124,9 +131,11 @@ type ContractReader struct {
 	invoker Invoker
 }
 
+{{end -}}
 {{if .HasWriter}}// Contract implements all contract methods.
 type Contract struct {
-	ContractReader
+	{{if .HasReader}}ContractReader
+	{{end -}}
 	{{if .IsNep11D}}nep11.DivisibleWriter
 	{{end -}}
 	{{if .IsNep11ND}}nep11.BaseWriter
@@ -137,7 +146,7 @@ type Contract struct {
 }
 
 {{end -}}
-// NewReader creates an instance of ContractReader using Hash and the given Invoker.
+{{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}}
@@ -146,6 +155,7 @@ func NewReader(invoker Invoker) *ContractReader {
 		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)
@@ -154,11 +164,12 @@ func New(actor Actor) *Contract {
 	{{end -}}
 	{{if .IsNep17}}var nep17t = nep17.New(actor, Hash)
 	{{end -}}
-	return &Contract{ContractReader{
+	return &Contract{
+		{{- if .HasReader}}ContractReader{
 		{{- if .IsNep11D}}nep11dt.DivisibleReader, {{end -}}
 		{{- if .IsNep11ND}}nep11ndt.NonDivisibleReader, {{end -}}
 		{{- if .IsNep17}}nep17t.TokenReader, {{end -}}
-		actor},
+		actor}, {{end -}}
 		{{- if .IsNep11D}}nep11dt.DivisibleWriter, {{end -}}
 		{{- if .IsNep11ND}}nep11ndt.BaseWriter, {{end -}}
 		{{- if .IsNep17}}nep17t.TokenWriter, {{end -}}
@@ -185,6 +196,7 @@ type (
 		IsNep11ND bool
 		IsNep17   bool
 
+		HasReader bool
 		HasWriter bool
 	}
 )
@@ -353,6 +365,9 @@ func scTemplateToRPC(cfg binding.Config, ctr ContractTmpl, imports map[string]st
 	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)