package state import ( "bytes" "context" "fmt" "github.com/ipfs/go-cid" cbor "github.com/ipfs/go-ipld-cbor" logging "github.com/ipfs/go-log/v2" "go.opencensus.io/trace" "golang.org/x/xerrors" "github.com/filecoin-project/go-address" "github.com/filecoin-project/go-state-types/abi" "github.com/filecoin-project/lotus/chain/actors" init_ "github.com/filecoin-project/lotus/chain/actors/builtin/init" cbg "github.com/whyrusleeping/cbor-gen" "github.com/filecoin-project/lotus/chain/actors/adt" "github.com/filecoin-project/lotus/chain/types" ) var log = logging.Logger("statetree") // StateTree stores actors state by their ID. type StateTree struct { root adt.Map version actors.Version // TODO info cid.Cid Store cbor.IpldStore snaps *stateSnaps } type stateSnaps struct { layers []*stateSnapLayer } type stateSnapLayer struct { actors map[address.Address]streeOp resolveCache map[address.Address]address.Address } func newStateSnapLayer() *stateSnapLayer { return &stateSnapLayer{ actors: make(map[address.Address]streeOp), resolveCache: make(map[address.Address]address.Address), } } type streeOp struct { Act types.Actor Delete bool } func newStateSnaps() *stateSnaps { ss := &stateSnaps{} ss.addLayer() return ss } func (ss *stateSnaps) addLayer() { ss.layers = append(ss.layers, newStateSnapLayer()) } func (ss *stateSnaps) dropLayer() { ss.layers[len(ss.layers)-1] = nil // allow it to be GCed ss.layers = ss.layers[:len(ss.layers)-1] } func (ss *stateSnaps) mergeLastLayer() { last := ss.layers[len(ss.layers)-1] nextLast := ss.layers[len(ss.layers)-2] for k, v := range last.actors { nextLast.actors[k] = v } for k, v := range last.resolveCache { nextLast.resolveCache[k] = v } ss.dropLayer() } func (ss *stateSnaps) resolveAddress(addr address.Address) (address.Address, bool) { for i := len(ss.layers) - 1; i >= 0; i-- { resa, ok := ss.layers[i].resolveCache[addr] if ok { return resa, true } } return address.Undef, false } func (ss *stateSnaps) cacheResolveAddress(addr, resa address.Address) { ss.layers[len(ss.layers)-1].resolveCache[addr] = resa } func (ss *stateSnaps) getActor(addr address.Address) (*types.Actor, error) { for i := len(ss.layers) - 1; i >= 0; i-- { act, ok := ss.layers[i].actors[addr] if ok { if act.Delete { return nil, types.ErrActorNotFound } return &act.Act, nil } } return nil, nil } func (ss *stateSnaps) setActor(addr address.Address, act *types.Actor) { ss.layers[len(ss.layers)-1].actors[addr] = streeOp{Act: *act} } func (ss *stateSnaps) deleteActor(addr address.Address) { ss.layers[len(ss.layers)-1].actors[addr] = streeOp{Delete: true} } func NewStateTree(cst cbor.IpldStore, version actors.Version) (*StateTree, error) { var info cid.Cid switch version { case actors.Version0: // info is undefined case actors.Version2: var err error info, err = cst.Put(context.TODO(), new(types.StateInfo)) if err != nil { return nil, err } default: return nil, xerrors.Errorf("unsupported state tree version: %d", version) } root, err := adt.NewMap(adt.WrapStore(context.TODO(), cst), version) if err != nil { return nil, err } return &StateTree{ root: root, info: info, version: version, Store: cst, snaps: newStateSnaps(), }, nil } func LoadStateTree(cst cbor.IpldStore, c cid.Cid) (*StateTree, error) { var root types.StateRoot // Try loading as a new-style state-tree (version/actors tuple). if err := cst.Get(context.TODO(), c, &root); err != nil { // We failed to decode as the new version, must be an old version. root.Actors = c root.Version = actors.Version0 } switch root.Version { case actors.Version0, actors.Version2: // Load the actual state-tree HAMT. nd, err := adt.AsMap(adt.WrapStore(context.TODO(), cst), root.Actors, actors.Version(root.Version)) if err != nil { log.Errorf("loading hamt node %s failed: %s", c, err) return nil, err } return &StateTree{ root: nd, info: root.Info, version: actors.Version(root.Version), Store: cst, snaps: newStateSnaps(), }, nil default: return nil, xerrors.Errorf("unsupported state tree version: %d", root.Version) } } func (st *StateTree) SetActor(addr address.Address, act *types.Actor) error { iaddr, err := st.LookupID(addr) if err != nil { return xerrors.Errorf("ID lookup failed: %w", err) } addr = iaddr st.snaps.setActor(addr, act) return nil } // LookupID gets the ID address of this actor's `addr` stored in the `InitActor`. func (st *StateTree) LookupID(addr address.Address) (address.Address, error) { if addr.Protocol() == address.ID { return addr, nil } resa, ok := st.snaps.resolveAddress(addr) if ok { return resa, nil } act, err := st.GetActor(init_.Address) if err != nil { return address.Undef, xerrors.Errorf("getting init actor: %w", err) } ias, err := init_.Load(&AdtStore{st.Store}, act) if err != nil { return address.Undef, xerrors.Errorf("loading init actor state: %w", err) } a, found, err := ias.ResolveAddress(addr) if err == nil && !found { err = types.ErrActorNotFound } if err != nil { return address.Undef, xerrors.Errorf("resolve address %s: %w", addr, err) } st.snaps.cacheResolveAddress(addr, a) return a, nil } // GetActor returns the actor from any type of `addr` provided. func (st *StateTree) GetActor(addr address.Address) (*types.Actor, error) { if addr == address.Undef { return nil, fmt.Errorf("GetActor called on undefined address") } // Transform `addr` to its ID format. iaddr, err := st.LookupID(addr) if err != nil { if xerrors.Is(err, types.ErrActorNotFound) { return nil, xerrors.Errorf("resolution lookup failed (%s): %w", addr, err) } return nil, xerrors.Errorf("address resolution: %w", err) } addr = iaddr snapAct, err := st.snaps.getActor(addr) if err != nil { return nil, err } if snapAct != nil { return snapAct, nil } var act types.Actor if found, err := st.root.Get(abi.AddrKey(addr), &act); err != nil { return nil, xerrors.Errorf("hamt find failed: %w", err) } else if !found { return nil, types.ErrActorNotFound } st.snaps.setActor(addr, &act) return &act, nil } func (st *StateTree) DeleteActor(addr address.Address) error { if addr == address.Undef { return xerrors.Errorf("DeleteActor called on undefined address") } iaddr, err := st.LookupID(addr) if err != nil { if xerrors.Is(err, types.ErrActorNotFound) { return xerrors.Errorf("resolution lookup failed (%s): %w", addr, err) } return xerrors.Errorf("address resolution: %w", err) } addr = iaddr _, err = st.GetActor(addr) if err != nil { return err } st.snaps.deleteActor(addr) return nil } func (st *StateTree) Flush(ctx context.Context) (cid.Cid, error) { ctx, span := trace.StartSpan(ctx, "stateTree.Flush") //nolint:staticcheck defer span.End() if len(st.snaps.layers) != 1 { return cid.Undef, xerrors.Errorf("tried to flush state tree with snapshots on the stack") } for addr, sto := range st.snaps.layers[0].actors { if sto.Delete { if err := st.root.Delete(abi.AddrKey(addr)); err != nil { return cid.Undef, err } } else { if err := st.root.Put(abi.AddrKey(addr), &sto.Act); err != nil { return cid.Undef, err } } } root, err := st.root.Root() if err != nil { return cid.Undef, xerrors.Errorf("failed to flush state-tree hamt: %w", err) } // If we're version 0, return a raw tree. if st.version == actors.Version0 { return root, nil } // Otherwise, return a versioned tree. return st.Store.Put(ctx, &types.StateRoot{Version: uint64(st.version), Actors: root, Info: st.info}) } func (st *StateTree) Snapshot(ctx context.Context) error { ctx, span := trace.StartSpan(ctx, "stateTree.SnapShot") //nolint:staticcheck defer span.End() st.snaps.addLayer() return nil } func (st *StateTree) ClearSnapshot() { st.snaps.mergeLastLayer() } func (st *StateTree) RegisterNewAddress(addr address.Address) (address.Address, error) { var out address.Address err := st.MutateActor(init_.Address, func(initact *types.Actor) error { ias, err := init_.Load(&AdtStore{st.Store}, initact) if err != nil { return err } oaddr, err := ias.MapAddressToNewID(addr) if err != nil { return err } out = oaddr ncid, err := st.Store.Put(context.TODO(), ias) if err != nil { return err } initact.Head = ncid return nil }) if err != nil { return address.Undef, err } return out, nil } type AdtStore struct{ cbor.IpldStore } func (a *AdtStore) Context() context.Context { return context.TODO() } var _ adt.Store = (*AdtStore)(nil) func (st *StateTree) Revert() error { st.snaps.dropLayer() st.snaps.addLayer() return nil } func (st *StateTree) MutateActor(addr address.Address, f func(*types.Actor) error) error { act, err := st.GetActor(addr) if err != nil { return err } if err := f(act); err != nil { return err } return st.SetActor(addr, act) } func (st *StateTree) ForEach(f func(address.Address, *types.Actor) error) error { var act types.Actor return st.root.ForEach(&act, func(k string) error { act := act // copy addr, err := address.NewFromBytes([]byte(k)) if err != nil { return xerrors.Errorf("invalid address (%x) found in state tree key: %w", []byte(k), err) } return f(addr, &act) }) } // Version returns the version of the StateTree data structure in use. func (st *StateTree) Version() actors.Version { return st.version } func Diff(oldTree, newTree *StateTree) (map[string]types.Actor, error) { out := map[string]types.Actor{} var ( ncval, ocval cbg.Deferred buf = bytes.NewReader(nil) ) if err := newTree.root.ForEach(&ncval, func(k string) error { var act types.Actor addr, err := address.NewFromBytes([]byte(k)) if err != nil { return xerrors.Errorf("address in state tree was not valid: %w", err) } found, err := oldTree.root.Get(abi.AddrKey(addr), &ocval) if err != nil { return err } if found && bytes.Equal(ocval.Raw, ncval.Raw) { return nil // not changed } buf.Reset(ncval.Raw) err = act.UnmarshalCBOR(buf) buf.Reset(nil) if err != nil { return err } out[addr.String()] = act return nil }); err != nil { return nil, err } return out, nil }