lotus/chain/state/statetree.go
2020-02-04 14:19:05 -08:00

207 lines
4.4 KiB
Go

package state
import (
"context"
"fmt"
"github.com/ipfs/go-cid"
hamt "github.com/ipfs/go-hamt-ipld"
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/lotus/chain/actors"
"github.com/filecoin-project/lotus/chain/types"
)
var log = logging.Logger("statetree")
type StateTree struct {
root *hamt.Node
Store cbor.IpldStore
actorcache map[address.Address]*types.Actor
snapshot cid.Cid
}
func NewStateTree(cst cbor.IpldStore) (*StateTree, error) {
return &StateTree{
root: hamt.NewNode(cst),
Store: cst,
actorcache: make(map[address.Address]*types.Actor),
}, nil
}
func LoadStateTree(cst cbor.IpldStore, c cid.Cid) (*StateTree, error) {
nd, err := hamt.LoadNode(context.Background(), cst, c)
if err != nil {
log.Errorf("loading hamt node %s failed: %s", c, err)
return nil, err
}
return &StateTree{
root: nd,
Store: cst,
actorcache: make(map[address.Address]*types.Actor),
}, nil
}
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
cact, ok := st.actorcache[addr]
if ok {
if act == cact {
return nil
}
}
st.actorcache[addr] = act
return st.root.Set(context.TODO(), string(addr.Bytes()), act)
}
func (st *StateTree) LookupID(addr address.Address) (address.Address, error) {
if addr.Protocol() == address.ID {
return addr, nil
}
act, err := st.GetActor(actors.InitAddress)
if err != nil {
return address.Undef, xerrors.Errorf("getting init actor: %w", err)
}
var ias actors.InitActorState
if err := st.Store.Get(context.TODO(), act.Head, &ias); err != nil {
return address.Undef, xerrors.Errorf("loading init actor state: %w", err)
}
return ias.Lookup(st.Store, addr)
}
func (st *StateTree) GetActor(addr address.Address) (*types.Actor, error) {
if addr == address.Undef {
return nil, fmt.Errorf("GetActor called on undefined address")
}
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)
}
return nil, xerrors.Errorf("address resolution: %w", err)
}
addr = iaddr
cact, ok := st.actorcache[addr]
if ok {
return cact, nil
}
var act types.Actor
err = st.root.Find(context.TODO(), string(addr.Bytes()), &act)
if err != nil {
if err == hamt.ErrNotFound {
return nil, types.ErrActorNotFound
}
return nil, xerrors.Errorf("hamt find failed: %w", err)
}
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()
for addr, act := range st.actorcache {
if err := st.root.Set(ctx, string(addr.Bytes()), act); err != nil {
return cid.Undef, err
}
}
st.actorcache = make(map[address.Address]*types.Actor)
if err := st.root.Flush(ctx); err != nil {
return cid.Undef, err
}
return st.Store.Put(ctx, st.root)
}
func (st *StateTree) Snapshot(ctx context.Context) error {
ctx, span := trace.StartSpan(ctx, "stateTree.SnapShot")
defer span.End()
ss, err := st.Flush(ctx)
if err != nil {
return err
}
st.snapshot = ss
return nil
}
func (st *StateTree) RegisterNewAddress(addr address.Address, act *types.Actor) (address.Address, error) {
var out address.Address
err := st.MutateActor(actors.InitAddress, func(initact *types.Actor) error {
var ias actors.InitActorState
if err := st.Store.Get(context.TODO(), initact.Head, &ias); err != nil {
return err
}
oaddr, err := ias.AddActor(st.Store, 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
}
if err := st.SetActor(out, act); err != nil {
return address.Undef, err
}
return out, nil
}
func (st *StateTree) Revert() error {
nd, err := hamt.LoadNode(context.Background(), st.Store, st.snapshot)
if err != nil {
return err
}
st.root = nd
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)
}