lotus/chain/state/statetree.go

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package state
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import (
"context"
"fmt"
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"github.com/filecoin-project/specs-actors/actors/builtin"
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init_ "github.com/filecoin-project/specs-actors/actors/builtin/init"
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"github.com/filecoin-project/specs-actors/actors/util/adt"
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"github.com/ipfs/go-cid"
hamt "github.com/ipfs/go-hamt-ipld"
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cbor "github.com/ipfs/go-ipld-cbor"
logging "github.com/ipfs/go-log/v2"
"go.opencensus.io/trace"
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"golang.org/x/xerrors"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/lotus/chain/types"
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)
var log = logging.Logger("statetree")
// StateTree stores actors state by their ID.
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type StateTree struct {
root *hamt.Node
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Store cbor.IpldStore
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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}
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}
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func NewStateTree(cst cbor.IpldStore) (*StateTree, error) {
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return &StateTree{
root: hamt.NewNode(cst, hamt.UseTreeBitWidth(5)),
Store: cst,
snaps: newStateSnaps(),
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}, nil
}
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func LoadStateTree(cst cbor.IpldStore, c cid.Cid) (*StateTree, error) {
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nd, err := hamt.LoadNode(context.Background(), cst, c, hamt.UseTreeBitWidth(5))
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if err != nil {
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log.Errorf("loading hamt node %s failed: %s", c, err)
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return nil, err
}
return &StateTree{
root: nd,
Store: cst,
snaps: newStateSnaps(),
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}, nil
}
func (st *StateTree) SetActor(addr address.Address, act *types.Actor) error {
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iaddr, err := st.LookupID(addr)
if err != nil {
return xerrors.Errorf("ID lookup failed: %w", err)
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}
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addr = iaddr
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st.snaps.setActor(addr, act)
return nil
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}
// LookupID gets the ID address of this actor's `addr` stored in the `InitActor`.
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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
}
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act, err := st.GetActor(builtin.InitActorAddr)
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if err != nil {
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return address.Undef, xerrors.Errorf("getting init actor: %w", err)
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}
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var ias init_.State
if err := st.Store.Get(context.TODO(), act.Head, &ias); err != nil {
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return address.Undef, xerrors.Errorf("loading init actor state: %w", err)
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}
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a, err := ias.ResolveAddress(&AdtStore{st.Store}, addr)
if err != nil {
return address.Undef, xerrors.Errorf("resolve address %s: %w", addr, err)
}
st.snaps.cacheResolveAddress(addr, a)
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return a, nil
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}
// 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.
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iaddr, err := st.LookupID(addr)
if err != nil {
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if xerrors.Is(err, init_.ErrAddressNotFound) {
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return nil, xerrors.Errorf("resolution lookup failed (%s): %w", addr, err)
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}
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return nil, xerrors.Errorf("address resolution: %w", err)
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}
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addr = iaddr
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snapAct, err := st.snaps.getActor(addr)
if err != nil {
return nil, err
}
if snapAct != nil {
return snapAct, nil
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}
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var act types.Actor
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err = st.root.Find(context.TODO(), string(addr.Bytes()), &act)
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if err != nil {
if err == hamt.ErrNotFound {
return nil, types.ErrActorNotFound
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}
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return nil, xerrors.Errorf("hamt find failed: %w", err)
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}
st.snaps.setActor(addr, &act)
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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, init_.ErrAddressNotFound) {
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")
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(ctx, string(addr.Bytes())); err != nil {
return cid.Undef, err
}
} else {
if err := st.root.Set(ctx, string(addr.Bytes()), &sto.Act); err != nil {
return cid.Undef, err
}
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}
}
if err := st.root.Flush(ctx); err != nil {
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return cid.Undef, err
}
return st.Store.Put(ctx, st.root)
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}
func (st *StateTree) Snapshot(ctx context.Context) error {
ctx, span := trace.StartSpan(ctx, "stateTree.SnapShot")
defer span.End()
st.snaps.addLayer()
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return nil
}
func (st *StateTree) ClearSnapshot() {
st.snaps.mergeLastLayer()
}
func (st *StateTree) RegisterNewAddress(addr address.Address) (address.Address, error) {
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var out address.Address
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err := st.MutateActor(builtin.InitActorAddr, func(initact *types.Actor) error {
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var ias init_.State
if err := st.Store.Get(context.TODO(), initact.Head, &ias); err != nil {
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return err
}
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oaddr, err := ias.MapAddressToNewID(&AdtStore{st.Store}, addr)
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if err != nil {
return err
}
out = oaddr
ncid, err := st.Store.Put(context.TODO(), &ias)
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if err != nil {
return err
}
initact.Head = ncid
return nil
})
if err != nil {
return address.Undef, err
}
return out, nil
}
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type AdtStore struct{ cbor.IpldStore }
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func (a *AdtStore) Context() context.Context {
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return context.TODO()
}
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var _ adt.Store = (*AdtStore)(nil)
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func (st *StateTree) Revert() error {
st.snaps.dropLayer()
st.snaps.addLayer()
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return nil
}
func (st *StateTree) MutateActor(addr address.Address, f func(*types.Actor) error) error {
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act, err := st.GetActor(addr)
if err != nil {
return err
}
if err := f(act); err != nil {
return err
}
return st.SetActor(addr, act)
}