37 lines
1,012 B
Go
37 lines
1,012 B
Go
package callback
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import (
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"errors"
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"github.com/nspcc-dev/neo-go/pkg/core/interop"
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"github.com/nspcc-dev/neo-go/pkg/core/interop/interopnames"
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"github.com/nspcc-dev/neo-go/pkg/vm"
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"github.com/nspcc-dev/neo-go/pkg/vm/stackitem"
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)
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// Callback is an interface for arbitrary callbacks.
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type Callback interface {
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// ArgCount returns expected number of arguments.
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ArgCount() int
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// LoadContext loads context and arguments on stack.
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LoadContext(*vm.VM, []stackitem.Item)
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}
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// Invoke invokes provided callback.
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func Invoke(ic *interop.Context) error {
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cb := ic.VM.Estack().Pop().Interop().Value().(Callback)
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args := ic.VM.Estack().Pop().Array()
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if cb.ArgCount() != len(args) {
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return errors.New("invalid argument count")
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}
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cb.LoadContext(ic.VM, args)
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switch t := cb.(type) {
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case *MethodCallback:
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id := interopnames.ToID([]byte(interopnames.SystemContractCall))
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return ic.SyscallHandler(ic.VM, id)
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case *SyscallCallback:
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return ic.SyscallHandler(ic.VM, t.desc.ID)
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default:
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return nil
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}
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}
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