29 lines
712 B
Go
29 lines
712 B
Go
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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/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(_ *interop.Context, v *vm.VM) error {
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cb := v.Estack().Pop().Interop().Value().(Callback)
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args := v.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(v, args)
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return nil
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}
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