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/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/actors"
"github.com/filecoin-project/lotus/chain/types"
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)
var log = logging.Logger("statetree")
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type StateTree struct {
root *hamt.Node
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Store cbor.IpldStore
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actorcache map[address.Address]*types.Actor
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snapshot cid.Cid
}
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func NewStateTree(cst cbor.IpldStore) (*StateTree, error) {
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return &StateTree{
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root: hamt.NewNode(cst, hamt.UseTreeBitWidth(5)),
Store: cst,
actorcache: make(map[address.Address]*types.Actor),
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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,
actorcache: make(map[address.Address]*types.Actor),
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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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cact, ok := st.actorcache[addr]
if ok {
if act == cact {
return nil
}
}
st.actorcache[addr] = act
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return st.root.Set(context.TODO(), string(addr.Bytes()), act)
}
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func (st *StateTree) LookupID(addr address.Address) (address.Address, error) {
if addr.Protocol() == address.ID {
return addr, nil
}
act, err := st.GetActor(actors.InitAddress)
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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 actors.InitActorState
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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return ias.ResolveAddress(&adtStore{st.Store}, addr)
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}
func (st *StateTree) GetActor(addr address.Address) (*types.Actor, error) {
if addr == address.Undef {
return nil, fmt.Errorf("GetActor called on undefined address")
}
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iaddr, err := st.LookupID(addr)
if err != nil {
if xerrors.Is(err, hamt.ErrNotFound) {
return nil, xerrors.Errorf("resolution lookup failed (%s): %w", addr, types.ErrActorNotFound)
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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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cact, ok := st.actorcache[addr]
if ok {
return cact, nil
}
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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.actorcache[addr] = &act
return &act, nil
}
func (st *StateTree) Flush(ctx context.Context) (cid.Cid, error) {
ctx, span := trace.StartSpan(ctx, "stateTree.Flush")
defer span.End()
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for addr, act := range st.actorcache {
if err := st.root.Set(ctx, string(addr.Bytes()), act); err != nil {
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return cid.Undef, err
}
}
st.actorcache = make(map[address.Address]*types.Actor)
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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()
ss, err := st.Flush(ctx)
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if err != nil {
return err
}
st.snapshot = ss
return nil
}
func (st *StateTree) RegisterNewAddress(addr address.Address, act *types.Actor) (address.Address, error) {
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var out address.Address
err := st.MutateActor(actors.InitAddress, func(initact *types.Actor) error {
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var ias actors.InitActorState
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
}
if err := st.SetActor(out, act); 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 {
return context.TODO()
}
var _ adt.Store = (*adtStore)(nil)
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func (st *StateTree) Revert() error {
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nd, err := hamt.LoadNode(context.Background(), st.Store, st.snapshot, hamt.UseTreeBitWidth(5))
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if err != nil {
return err
}
st.root = nd
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)
}