lotus/chain/validation/state.go
2020-03-25 08:25:03 -04:00

206 lines
4.8 KiB
Go

package validation
import (
"context"
"github.com/filecoin-project/go-address"
"github.com/ipfs/go-cid"
"github.com/ipfs/go-datastore"
blockstore "github.com/ipfs/go-ipfs-blockstore"
cbor "github.com/ipfs/go-ipld-cbor"
"golang.org/x/xerrors"
"github.com/filecoin-project/specs-actors/actors/abi"
"github.com/filecoin-project/specs-actors/actors/abi/big"
"github.com/filecoin-project/specs-actors/actors/runtime"
"github.com/filecoin-project/specs-actors/actors/util/adt"
vstate "github.com/filecoin-project/chain-validation/state"
"github.com/filecoin-project/lotus/chain/state"
"github.com/filecoin-project/lotus/chain/types"
)
var _ vstate.VMWrapper = &StateWrapper{}
type StateWrapper struct {
// The blockstore underlying the state tree and storage.
bs blockstore.Blockstore
ds datastore.Batching
// HAMT-CBOR store on top of the blockstore.
cst cbor.IpldStore
// CID of the root of the state tree.
stateRoot cid.Cid
}
func NewState() *StateWrapper {
bs := blockstore.NewBlockstore(datastore.NewMapDatastore())
cst := cbor.NewCborStore(bs)
// Put EmptyObjectCid value in the store. When an actor is initially created its Head is set to this value.
_, err := cst.Put(context.TODO(), map[string]string{})
if err != nil {
panic(err)
}
treeImpl, err := state.NewStateTree(cst)
if err != nil {
panic(err) // Never returns error, the error return should be removed.
}
root, err := treeImpl.Flush(context.TODO())
if err != nil {
panic(err)
}
return &StateWrapper{
bs: bs,
ds: datastore.NewMapDatastore(),
cst: cst,
stateRoot: root,
}
}
func (s *StateWrapper) Root() cid.Cid {
return s.stateRoot
}
func (s *StateWrapper) Store() adt.Store {
tree, err := state.LoadStateTree(s.cst, s.stateRoot)
if err != nil {
panic(err)
}
return &contextStore{tree.Store, context.Background()}
}
func (s *StateWrapper) Actor(addr address.Address) (vstate.Actor, error) {
tree, err := state.LoadStateTree(s.cst, s.stateRoot)
if err != nil {
return nil, err
}
fcActor, err := tree.GetActor(addr)
if err != nil {
return nil, err
}
return &actorWrapper{*fcActor}, nil
}
func (s *StateWrapper) SetActorState(addr address.Address, balance abi.TokenAmount, actorState runtime.CBORMarshaler) (vstate.Actor, error) {
tree, err := state.LoadStateTree(s.cst, s.stateRoot)
if err != nil {
return nil, err
}
// actor should exist
act, err := tree.GetActor(addr)
if err != nil {
return nil, err
}
// add the state to the store and get a new head cid
actHead, err := tree.Store.Put(context.Background(), actorState)
if err != nil {
return nil, err
}
// update the actor object with new head and balance parameter
actr := &actorWrapper{types.Actor{
Code: act.Code,
Nonce: act.Nonce,
// updates
Head: actHead,
Balance: balance,
}}
if err := tree.SetActor(addr, &actr.Actor); err != nil {
return nil, err
}
return actr, s.flush(tree)
}
func (s *StateWrapper) CreateActor(code cid.Cid, addr address.Address, balance abi.TokenAmount, actorState runtime.CBORMarshaler) (vstate.Actor, address.Address, error) {
idAddr := addr
tree, err := state.LoadStateTree(s.cst, s.stateRoot)
if err != nil {
return nil, address.Undef, err
}
if addr.Protocol() != address.ID {
actHead, err := tree.Store.Put(context.Background(), actorState)
if err != nil {
return nil, address.Undef, err
}
actr := &actorWrapper{types.Actor{
Code: code,
Head: actHead,
Balance: balance,
}}
idAddr, err = tree.RegisterNewAddress(addr)
if err != nil {
return nil, address.Undef, xerrors.Errorf("register new address for actor: %w", err)
}
if err := tree.SetActor(addr, &actr.Actor); err != nil {
return nil, address.Undef, xerrors.Errorf("setting new actor for actor: %w", err)
}
}
// store newState
head, err := tree.Store.Put(context.Background(), actorState)
if err != nil {
return nil, address.Undef, err
}
// create and store actor object
a := types.Actor{
Code: code,
Head: head,
Balance: balance,
}
if err := tree.SetActor(idAddr, &a); err != nil {
return nil, address.Undef, err
}
return &actorWrapper{a}, idAddr, s.flush(tree)
}
// Flushes a state tree to storage and sets this state's root to that tree's root CID.
func (s *StateWrapper) flush(tree *state.StateTree) (err error) {
s.stateRoot, err = tree.Flush(context.TODO())
return
}
//
// Actor Wrapper
//
type actorWrapper struct {
types.Actor
}
func (a *actorWrapper) Code() cid.Cid {
return a.Actor.Code
}
func (a *actorWrapper) Head() cid.Cid {
return a.Actor.Head
}
func (a *actorWrapper) CallSeqNum() uint64 {
return a.Actor.Nonce
}
func (a *actorWrapper) Balance() big.Int {
return a.Actor.Balance
}
//
// Storage
//
type contextStore struct {
cbor.IpldStore
ctx context.Context
}
func (s *contextStore) Context() context.Context {
return s.ctx
}