lotus/chain/state/statetree.go
2019-07-31 10:43:13 -07:00

206 lines
4.2 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"
"github.com/filecoin-project/go-lotus/chain/actors"
"github.com/filecoin-project/go-lotus/chain/address"
"github.com/filecoin-project/go-lotus/chain/types"
)
var log = logging.Logger("statetree")
type StateTree struct {
root *hamt.Node
Store *hamt.CborIpldStore
actorcache map[address.Address]*types.Actor
snapshot cid.Cid
}
func NewStateTree(cst *hamt.CborIpldStore) (*StateTree, error) {
return &StateTree{
root: hamt.NewNode(cst),
Store: cst,
actorcache: make(map[address.Address]*types.Actor),
}, nil
}
func LoadStateTree(cst *hamt.CborIpldStore, 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 {
if addr.Protocol() != address.ID {
iaddr, err := st.lookupID(addr)
if err != nil {
return err
}
addr = iaddr
}
cact, ok := st.actorcache[addr]
if ok {
if act == cact {
return nil
}
}
return st.root.Set(context.TODO(), string(addr.Bytes()), act)
}
func (st *StateTree) lookupID(addr address.Address) (address.Address, error) {
act, err := st.GetActor(actors.InitActorAddress)
if err != nil {
return address.Undef, err
}
var ias actors.InitActorState
if err := st.Store.Get(context.TODO(), act.Head, &ias); err != nil {
return address.Undef, 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")
}
if addr.Protocol() != address.ID {
iaddr, err := st.lookupID(addr)
if err != nil {
if err == hamt.ErrNotFound {
return nil, types.ErrActorNotFound
}
return nil, err
}
addr = iaddr
}
cact, ok := st.actorcache[addr]
if ok {
return cact, nil
}
thing, err := st.root.Find(context.TODO(), string(addr.Bytes()))
if err != nil {
if err == hamt.ErrNotFound {
return nil, types.ErrActorNotFound
}
return nil, err
}
var act types.Actor
badout, err := cbor.DumpObject(thing)
if err != nil {
return nil, err
}
if err := cbor.DecodeInto(badout, &act); err != nil {
return nil, err
}
st.actorcache[addr] = &act
return &act, nil
}
func (st *StateTree) Flush() (cid.Cid, error) {
for addr, act := range st.actorcache {
if err := st.root.Set(context.TODO(), string(addr.Bytes()), act); err != nil {
return cid.Undef, err
}
}
st.actorcache = make(map[address.Address]*types.Actor)
if err := st.root.Flush(context.TODO()); err != nil {
return cid.Undef, err
}
return st.Store.Put(context.TODO(), st.root)
}
func (st *StateTree) Snapshot() error {
ss, err := st.Flush()
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.InitActorAddress, 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)
}