lotus/chain/actors/builtin/system/actor.go.template

package system

import (
	"github.com/ipfs/go-cid"
	actorstypes "github.com/filecoin-project/go-state-types/actors"
	"github.com/filecoin-project/go-state-types/manifest"
	"github.com/filecoin-project/lotus/chain/actors/adt"
	"github.com/filecoin-project/lotus/chain/actors"
	"github.com/filecoin-project/lotus/chain/types"
	"github.com/ipfs/go-cid"

	"golang.org/x/xerrors"

{{range .versions}}
    {{if (le . 7)}}
	    builtin{{.}} "github.com/filecoin-project/specs-actors{{import .}}actors/builtin"
    {{end}}
{{end}}
    builtin{{.latestVersion}} "github.com/filecoin-project/go-state-types/builtin"
)

var (
	Address = builtin{{.latestVersion}}.SystemActorAddr
)

func Load(store adt.Store, act *types.Actor) (State, error) {
	if name, av, ok := actors.GetActorMetaByCode(act.Code); ok {
       if name != manifest.SystemKey {
          return nil, xerrors.Errorf("actor code is not system: %s", name)
       }

       switch av {
            {{range .versions}}
                {{if (ge . 8)}}
                case actorstypes.Version{{.}}:
                     return load{{.}}(store, act.Head)
                 {{end}}
            {{end}}
       }
	}

	switch act.Code {
{{range .versions}}
    {{if (le . 7)}}
        case builtin{{.}}.SystemActorCodeID:
            return load{{.}}(store, act.Head)
    {{end}}
{{end}}
	}

	return nil, xerrors.Errorf("unknown actor code %s", act.Code)
}

func MakeState(store adt.Store, av actorstypes.Version, builtinActors cid.Cid) (State, error) {
	switch av {
{{range .versions}}
	case actorstypes.Version{{.}}:
		return make{{.}}(store{{if (ge . 8)}}, builtinActors{{end}})
{{end}}
}
	return nil, xerrors.Errorf("unknown actor version %d", av)
}

type State interface {
    Code() cid.Cid
    ActorKey() string
    ActorVersion() actorstypes.Version

	GetState() interface{}
	GetBuiltinActors() cid.Cid
	SetBuiltinActors(cid.Cid) error
}

func AllCodes() []cid.Cid {
	return []cid.Cid{ {{range .versions}}
        (&state{{.}}{}).Code(),
    {{- end}}
    }
}