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abi.go
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abi.go
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package manifest
import (
"errors"
"fmt"
"sort"
"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
)
const (
// MethodInit is a name for default initialization method.
MethodInit = "_initialize"
// MethodDeploy is a name for default method called during contract deployment.
MethodDeploy = "_deploy"
// MethodVerify is a name for default verification method.
MethodVerify = "verify"
// MethodOnNEP17Payment is the name of the method which is called when contract receives NEP-17 tokens.
MethodOnNEP17Payment = "onNEP17Payment"
// MethodOnNEP11Payment is the name of the method which is called when contract receives NEP-11 tokens.
MethodOnNEP11Payment = "onNEP11Payment"
)
// ABI represents a contract application binary interface.
type ABI struct {
Methods []Method `json:"methods"`
Events []Event `json:"events"`
}
// GetMethod returns methods with the specified name.
func (a *ABI) GetMethod(name string, paramCount int) *Method {
for i := range a.Methods {
if a.Methods[i].Name == name && (paramCount == -1 || len(a.Methods[i].Parameters) == paramCount) {
return &a.Methods[i]
}
}
return nil
}
// GetEvent returns the event with the specified name.
func (a *ABI) GetEvent(name string) *Event {
for i := range a.Events {
if a.Events[i].Name == name {
return &a.Events[i]
}
}
return nil
}
// IsValid checks ABI consistency and correctness.
func (a *ABI) IsValid() error {
if len(a.Methods) == 0 {
return errors.New("no methods")
}
for i := range a.Methods {
err := a.Methods[i].IsValid()
if err != nil {
return fmt.Errorf("method %q/%d: %w", a.Methods[i].Name, len(a.Methods[i].Parameters), err)
}
}
if len(a.Methods) > 1 {
methods := make([]struct {
name string
params int
}, len(a.Methods))
for i := range methods {
methods[i].name = a.Methods[i].Name
methods[i].params = len(a.Methods[i].Parameters)
}
sort.Slice(methods, func(i, j int) bool {
if methods[i].name < methods[j].name {
return true
}
if methods[i].name == methods[j].name {
return methods[i].params < methods[j].params
}
return false
})
for i := range methods {
if i == 0 {
continue
}
if methods[i].name == methods[i-1].name &&
methods[i].params == methods[i-1].params {
return errors.New("duplicate method specifications")
}
}
}
for i := range a.Events {
err := a.Events[i].IsValid()
if err != nil {
return fmt.Errorf("event %q/%d: %w", a.Events[i].Name, len(a.Events[i].Parameters), err)
}
}
if len(a.Events) > 1 {
names := make([]string, len(a.Events))
for i := range a.Events {
names[i] = a.Events[i].Name
}
if stringsHaveDups(names) {
return errors.New("duplicate event names")
}
}
return nil
}
// ToStackItem converts ABI to stackitem.Item.
func (a *ABI) ToStackItem() stackitem.Item {
methods := make([]stackitem.Item, len(a.Methods))
for i := range a.Methods {
methods[i] = a.Methods[i].ToStackItem()
}
events := make([]stackitem.Item, len(a.Events))
for i := range a.Events {
events[i] = a.Events[i].ToStackItem()
}
return stackitem.NewStruct([]stackitem.Item{
stackitem.Make(methods),
stackitem.Make(events),
})
}
// FromStackItem converts stackitem.Item to ABI.
func (a *ABI) FromStackItem(item stackitem.Item) error {
if item.Type() != stackitem.StructT {
return errors.New("invalid ABI stackitem type")
}
str := item.Value().([]stackitem.Item)
if len(str) != 2 {
return errors.New("invalid ABI stackitem length")
}
if str[0].Type() != stackitem.ArrayT {
return errors.New("invalid Methods stackitem type")
}
methods := str[0].Value().([]stackitem.Item)
a.Methods = make([]Method, len(methods))
for i := range methods {
m := new(Method)
if err := m.FromStackItem(methods[i]); err != nil {
return err
}
a.Methods[i] = *m
}
if str[1].Type() != stackitem.ArrayT {
return errors.New("invalid Events stackitem type")
}
events := str[1].Value().([]stackitem.Item)
a.Events = make([]Event, len(events))
for i := range events {
e := new(Event)
if err := e.FromStackItem(events[i]); err != nil {
return err
}
a.Events[i] = *e
}
return nil
}