80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
package native
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import (
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"errors"
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"fmt"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract"
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"github.com/nspcc-dev/neo-go/pkg/smartcontract/trigger"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// Call calls specified native contract method.
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func Call(ic *interop.Context) error {
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id := int32(ic.VM.Estack().Pop().BigInt().Int64())
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var c interop.Contract
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for _, ctr := range ic.Natives {
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if ctr.Metadata().ID == id {
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c = ctr
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break
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}
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}
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if c == nil {
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return fmt.Errorf("native contract %d not found", id)
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}
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h := ic.VM.GetCurrentScriptHash()
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if !h.Equals(c.Metadata().Hash) {
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return errors.New("it is not allowed to use Neo.Native.Call directly to call native contracts. System.Contract.Call should be used")
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}
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operation := ic.VM.Estack().Pop().String()
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m, ok := c.Metadata().GetMethod(operation, ic.VM.Estack().Len())
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if !ok {
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return fmt.Errorf("method %s not found", operation)
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}
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if !ic.VM.Context().GetCallFlags().Has(m.RequiredFlags) {
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return fmt.Errorf("missing call flags for native %d `%s` operation call: %05b vs %05b", id, operation, ic.VM.Context().GetCallFlags(), m.RequiredFlags)
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}
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// Native contract prices are not multiplied by `BaseExecFee`.
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if !ic.VM.AddGas(m.Price) {
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return errors.New("gas limit exceeded")
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}
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ctx := ic.VM.Context()
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args := make([]stackitem.Item, len(m.MD.Parameters))
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for i := range args {
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args[i] = ic.VM.Estack().Pop().Item()
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}
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result := m.Func(ic, args)
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if m.MD.ReturnType != smartcontract.VoidType {
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ctx.Estack().PushVal(result)
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}
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return nil
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}
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// OnPersist calls OnPersist methods for all native contracts.
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func OnPersist(ic *interop.Context) error {
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if ic.Trigger != trigger.OnPersist {
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return errors.New("onPersist must be trigered by system")
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}
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for _, c := range ic.Natives {
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err := c.OnPersist(ic)
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if err != nil {
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return err
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}
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}
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return nil
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}
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// PostPersist calls PostPersist methods for all native contracts.
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func PostPersist(ic *interop.Context) error {
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if ic.Trigger != trigger.PostPersist {
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return errors.New("postPersist must be trigered by system")
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}
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for _, c := range ic.Natives {
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err := c.PostPersist(ic)
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if err != nil {
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return err
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}
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}
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return nil
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}
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