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