121 lines
3.3 KiB
Go
121 lines
3.3 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/config"
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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/callflag"
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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 the specified native contract method.
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func Call(ic *interop.Context) error {
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version := ic.VM.Estack().Pop().BigInt().Int64()
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if version != 0 {
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return fmt.Errorf("native contract of version %d is not active", version)
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}
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var (
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c interop.Contract
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curr = ic.VM.GetCurrentScriptHash()
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)
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for _, ctr := range ic.Natives {
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if ctr.Metadata().Hash == curr {
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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 %s (version %d) not found", curr.StringLE(), version)
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}
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var (
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genericMeta = c.Metadata()
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activeIn = c.ActiveIn()
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)
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if activeIn != nil {
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height, ok := ic.Hardforks[activeIn.String()]
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// Persisting block must not be taken into account, native contract can be called
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// only AFTER its initialization block persist, thus, can't use ic.IsHardforkEnabled.
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if !ok || ic.BlockHeight() < height {
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return fmt.Errorf("native contract %s is active after hardfork %s", genericMeta.Name, activeIn.String())
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}
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}
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var current config.Hardfork
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for _, hf := range config.Hardforks {
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if !ic.IsHardforkEnabled(hf) {
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break
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}
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current = hf
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}
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meta := genericMeta.HFSpecificContractMD(¤t)
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m, ok := meta.GetMethodByOffset(ic.VM.Context().IP())
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if !ok {
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return fmt.Errorf("method not found")
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}
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reqFlags := m.RequiredFlags
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if !ic.IsHardforkEnabled(config.HFAspidochelone) && meta.ID == ManagementContractID &&
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(m.MD.Name == "deploy" || m.MD.Name == "update") {
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reqFlags &= callflag.States | callflag.AllowNotify
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}
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if !ic.VM.Context().GetCallFlags().Has(reqFlags) {
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return fmt.Errorf("missing call flags for native %d `%s` operation call: %05b vs %05b",
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version, m.MD.Name, ic.VM.Context().GetCallFlags(), reqFlags)
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}
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invokeFee := m.CPUFee*ic.BaseExecFee() +
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m.StorageFee*ic.BaseStorageFee()
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if !ic.VM.AddGas(invokeFee) {
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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().Peek(i).Item()
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}
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result := m.Func(ic, args)
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for range m.MD.Parameters {
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ic.VM.Estack().Pop()
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}
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if m.MD.ReturnType != smartcontract.VoidType {
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ctx.Estack().PushItem(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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activeIn := c.ActiveIn()
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if !(activeIn == nil || ic.IsHardforkEnabled(*activeIn)) {
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continue
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}
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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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activeIn := c.ActiveIn()
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if !(activeIn == nil || ic.IsHardforkEnabled(*activeIn)) {
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continue
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}
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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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