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vm.go
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vm.go
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package vm_test
import (
"context"
"fmt"
"github.com/filecoin-project/go-address"
"github.com/filecoin-project/go-state-types/abi"
"github.com/filecoin-project/go-state-types/big"
"github.com/filecoin-project/go-state-types/cbor"
"github.com/filecoin-project/go-state-types/exitcode"
"github.com/filecoin-project/go-state-types/network"
"github.com/filecoin-project/go-state-types/rt"
"github.com/ipfs/go-cid"
"github.com/pkg/errors"
"github.com/filecoin-project/specs-actors/v3/actors/builtin"
init_ "github.com/filecoin-project/specs-actors/v3/actors/builtin/init"
"github.com/filecoin-project/specs-actors/v3/actors/runtime"
"github.com/filecoin-project/specs-actors/v3/actors/states"
"github.com/filecoin-project/specs-actors/v3/actors/util/adt"
)
// VM is a simplified message execution framework for the purposes of testing inter-actor communication.
// The VM maintains actor state and can be used to simulate message validation for a single block or tipset.
// The VM does not track gas charges, provide working syscalls, validate message nonces and many other things
// that a compliant VM needs to do.
type VM struct {
ctx context.Context
store adt.Store
currentEpoch abi.ChainEpoch
networkVersion network.Version
ActorImpls ActorImplLookup
stateRoot cid.Cid // The last committed root.
actors *adt.Map // The current (not necessarily committed) root node.
actorsDirty bool
emptyObject cid.Cid
callSequence uint64
logs []string
invocationStack []*Invocation
invocations []*Invocation
statsSource StatsSource
statsByMethod StatsByCall
circSupply abi.TokenAmount
}
// VM types
type ActorImplLookup map[cid.Cid]runtime.VMActor
type InternalMessage struct {
from address.Address
to address.Address
value abi.TokenAmount
method abi.MethodNum
params interface{}
}
type Invocation struct {
Msg *InternalMessage
Exitcode exitcode.ExitCode
Ret cbor.Marshaler
SubInvocations []*Invocation
}
// NewVM creates a new runtime for executing messages.
func NewVM(ctx context.Context, actorImpls ActorImplLookup, store adt.Store) *VM {
actors, err := adt.MakeEmptyMap(store, builtin.DefaultHamtBitwidth)
if err != nil {
panic(err)
}
actorRoot, err := actors.Root()
if err != nil {
panic(err)
}
emptyObject, err := store.Put(context.TODO(), []struct{}{})
if err != nil {
panic(err)
}
return &VM{
ctx: ctx,
ActorImpls: actorImpls,
store: store,
actors: actors,
stateRoot: actorRoot,
actorsDirty: false,
emptyObject: emptyObject,
networkVersion: network.VersionMax,
statsByMethod: make(StatsByCall),
circSupply: big.Mul(big.NewInt(1e9), big.NewInt(1e18)),
}
}
// NewVM creates a new runtime for executing messages.
func NewVMAtEpoch(ctx context.Context, actorImpls ActorImplLookup, store adt.Store, stateRoot cid.Cid, epoch abi.ChainEpoch) (*VM, error) {
actors, err := adt.AsMap(store, stateRoot, builtin.DefaultHamtBitwidth)
if err != nil {
return nil, err
}
emptyObject, err := store.Put(context.TODO(), []struct{}{})
if err != nil {
panic(err)
}
return &VM{
ctx: ctx,
ActorImpls: actorImpls,
currentEpoch: epoch,
store: store,
actors: actors,
stateRoot: stateRoot,
actorsDirty: false,
emptyObject: emptyObject,
networkVersion: network.VersionMax,
statsByMethod: make(StatsByCall),
circSupply: big.Mul(big.NewInt(1e9), big.NewInt(1e18)),
}, nil
}
func (vm *VM) WithEpoch(epoch abi.ChainEpoch) (*VM, error) {
_, err := vm.checkpoint()
if err != nil {
return nil, err
}
actors, err := adt.AsMap(vm.store, vm.stateRoot, builtin.DefaultHamtBitwidth)
if err != nil {
return nil, err
}
return &VM{
ctx: vm.ctx,
ActorImpls: vm.ActorImpls,
store: vm.store,
actors: actors,
stateRoot: vm.stateRoot,
actorsDirty: false,
emptyObject: vm.emptyObject,
currentEpoch: epoch,
networkVersion: vm.networkVersion,
statsSource: vm.statsSource,
statsByMethod: make(StatsByCall),
circSupply: vm.circSupply,
}, nil
}
func (vm *VM) WithNetworkVersion(nv network.Version) (*VM, error) {
_, err := vm.checkpoint()
if err != nil {
return nil, err
}
actors, err := adt.AsMap(vm.store, vm.stateRoot, builtin.DefaultHamtBitwidth)
if err != nil {
return nil, err
}
return &VM{
ctx: vm.ctx,
ActorImpls: vm.ActorImpls,
store: vm.store,
actors: actors,
stateRoot: vm.stateRoot,
actorsDirty: false,
emptyObject: vm.emptyObject,
currentEpoch: vm.currentEpoch,
networkVersion: nv,
statsSource: vm.statsSource,
statsByMethod: make(StatsByCall),
circSupply: vm.circSupply,
}, nil
}
func (vm *VM) rollback(root cid.Cid) error {
var err error
vm.actors, err = adt.AsMap(vm.store, root, builtin.DefaultHamtBitwidth)
if err != nil {
return errors.Wrapf(err, "failed to load node for %s", root)
}
// reset the root node
vm.stateRoot = root
vm.actorsDirty = false
return nil
}
func (vm *VM) GetActor(a address.Address) (*states.Actor, bool, error) {
na, found := vm.NormalizeAddress(a)
if !found {
return nil, false, nil
}
var act states.Actor
found, err := vm.actors.Get(abi.AddrKey(na), &act)
return &act, found, err
}
// SetActor sets the the actor to the given value whether it previously existed or not.
//
// This method will not check if the actor previously existed, it will blindly overwrite it.
func (vm *VM) setActor(_ context.Context, key address.Address, a *states.Actor) error {
if err := vm.actors.Put(abi.AddrKey(key), a); err != nil {
return errors.Wrap(err, "setting actor in state tree failed")
}
vm.actorsDirty = true
return nil
}
// SetActorState stores the state and updates the addressed actor
func (vm *VM) SetActorState(ctx context.Context, key address.Address, state cbor.Marshaler) error {
stateCid, err := vm.store.Put(ctx, state)
if err != nil {
return err
}
a, found, err := vm.GetActor(key)
if err != nil {
return err
}
if !found {
return errors.Errorf("could not find actor %s to set state", key)
}
a.Head = stateCid
return vm.setActor(ctx, key, a)
}
// deleteActor remove the actor from the storage.
//
// This method will NOT return an error if the actor was not found.
// This behaviour is based on a principle that some store implementations might not be able to determine
// whether something exists before deleting it.
func (vm *VM) deleteActor(_ context.Context, key address.Address) error {
found, err := vm.actors.TryDelete(abi.AddrKey(key))
vm.actorsDirty = found
return err
}
func (vm *VM) checkpoint() (cid.Cid, error) {
// commit the vm state
root, err := vm.actors.Root()
if err != nil {
return cid.Undef, err
}
vm.stateRoot = root
vm.actorsDirty = false
return root, nil
}
func (vm *VM) NormalizeAddress(addr address.Address) (address.Address, bool) {
// short-circuit if the address is already an ID address
if addr.Protocol() == address.ID {
return addr, true
}
// resolve the target address via the InitActor, and attempt to load state.
initActorEntry, found, err := vm.GetActor(builtin.InitActorAddr)
if err != nil {
panic(errors.Wrapf(err, "failed to load init actor"))
}
if !found {
panic(errors.Wrapf(err, "no init actor"))
}
// get a view into the actor state
var state init_.State
if err := vm.store.Get(vm.ctx, initActorEntry.Head, &state); err != nil {
panic(err)
}
idAddr, found, err := state.ResolveAddress(vm.store, addr)
if err != nil {
panic(err)
}
return idAddr, found
}
// ApplyMessage applies the message to the current state.
func (vm *VM) ApplyMessage(from, to address.Address, value abi.TokenAmount, method abi.MethodNum, params interface{}) (cbor.Marshaler, exitcode.ExitCode) {
// This method does not actually execute the message itself,
// but rather deals with the pre/post processing of a message.
// (see: `invocationContext.invoke()` for the dispatch and execution)
// load actor from global state
fromID, ok := vm.NormalizeAddress(from)
if !ok {
return nil, exitcode.SysErrSenderInvalid
}
fromActor, found, err := vm.GetActor(fromID)
if err != nil {
panic(err)
}
if !found {
// Execution error; sender does not exist at time of message execution.
return nil, exitcode.SysErrSenderInvalid
}
// checkpoint state
// Even if the message fails, the following accumulated changes will be applied:
// - CallSeqNumber increment
// - sender balance withheld
priorRoot, err := vm.checkpoint()
if err != nil {
panic(err)
}
// send
// 1. build internal message
// 2. build invocation context
// 3. process the msg
topLevel := topLevelContext{
originatorStableAddress: from,
// this should be nonce, but we only care that it creates a unique stable address
originatorCallSeq: vm.callSequence,
newActorAddressCount: 0,
statsSource: vm.statsSource,
circSupply: vm.circSupply,
}
vm.callSequence++
// build internal msg
imsg := InternalMessage{
from: fromID,
to: to,
value: value,
method: method,
params: params,
}
// build invocation context
ctx := newInvocationContext(vm, &topLevel, imsg, fromActor, vm.emptyObject)
// 3. invoke
ret, exitCode := ctx.invoke()
// record stats
vm.statsByMethod.MergeStats(ctx.toActor.Code, imsg.method, ctx.stats)
// Roll back all state if the receipt's exit code is not ok.
// This is required in addition to rollback within the invocation context since top level messages can fail for
// more reasons than internal ones. Invocation context still needs its own rollback so actors can recover and
// proceed from a nested call failure.
if exitCode != exitcode.Ok {
if err := vm.rollback(priorRoot); err != nil {
panic(err)
}
}
return ret.inner, exitCode
}
func (vm *VM) StateRoot() cid.Cid {
return vm.stateRoot
}
func (vm *VM) GetState(addr address.Address, out cbor.Unmarshaler) error {
act, found, err := vm.GetActor(addr)
if err != nil {
return err
}
if !found {
return errors.Errorf("actor %v not found", addr)
}
return vm.store.Get(vm.ctx, act.Head, out)
}
func (vm *VM) GetStateTree() (*states.Tree, error) {
root, err := vm.checkpoint()
if err != nil {
return nil, err
}
return states.LoadTree(vm.store, root)
}
func (vm *VM) GetTotalActorBalance() (abi.TokenAmount, error) {
tree, err := vm.GetStateTree()
if err != nil {
return big.Zero(), err
}
total := big.Zero()
err = tree.ForEach(func(_ address.Address, actor *states.Actor) error {
total = big.Add(total, actor.Balance)
return nil
})
if err != nil {
return big.Zero(), err
}
return total, nil
}
func (vm *VM) Store() adt.Store {
return vm.store
}
// Get the chain epoch for this vm
func (vm *VM) GetEpoch() abi.ChainEpoch {
return vm.currentEpoch
}
// Get call stats
func (vm *VM) GetCallStats() map[MethodKey]*CallStats {
return vm.statsByMethod
}
// Set the FIL circulating supply passed to actors through runtime
func (vm *VM) SetCirculatingSupply(supply abi.TokenAmount) {
vm.circSupply = supply
}
// Set the FIL circulating supply passed to actors through runtime
func (vm *VM) GetCirculatingSupply() abi.TokenAmount {
return vm.circSupply
}
// transfer debits money from one account and credits it to another.
// avoid calling this method with a zero amount else it will perform unnecessary actor loading.
//
// WARNING: this method will panic if the the amount is negative, accounts dont exist, or have inssuficient funds.
//
// Note: this is not idiomatic, it follows the Spec expectations for this method.
func (vm *VM) transfer(debitFrom address.Address, creditTo address.Address, amount abi.TokenAmount) (*states.Actor, *states.Actor) {
// allow only for positive amounts
if amount.LessThan(abi.NewTokenAmount(0)) {
panic("unreachable: negative funds transfer not allowed")
}
ctx := context.Background()
// retrieve debit account
fromActor, found, err := vm.GetActor(debitFrom)
if err != nil {
panic(err)
}
if !found {
panic(fmt.Errorf("unreachable: debit account not found. %s", err))
}
// check that account has enough balance for transfer
if fromActor.Balance.LessThan(amount) {
panic("unreachable: insufficient balance on debit account")
}
// debit funds
fromActor.Balance = big.Sub(fromActor.Balance, amount)
if err := vm.setActor(ctx, debitFrom, fromActor); err != nil {
panic(err)
}
// retrieve credit account
toActor, found, err := vm.GetActor(creditTo)
if err != nil {
panic(err)
}
if !found {
panic(fmt.Errorf("unreachable: credit account not found. %s", err))
}
// credit funds
toActor.Balance = big.Add(toActor.Balance, amount)
if err := vm.setActor(ctx, creditTo, toActor); err != nil {
panic(err)
}
return toActor, fromActor
}
func (vm *VM) getActorImpl(code cid.Cid) runtime.VMActor {
actorImpl, ok := vm.ActorImpls[code]
if !ok {
vm.Abortf(exitcode.SysErrInvalidReceiver, "actor implementation not found for Exitcode %v", code)
}
return actorImpl
}
//
// stats
//
func (vm *VM) SetStatsSource(s StatsSource) {
vm.statsSource = s
}
func (vm *VM) StoreReads() uint64 {
if vm.statsSource != nil {
return vm.statsSource.ReadCount()
}
return 0
}
func (vm *VM) StoreWrites() uint64 {
if vm.statsSource != nil {
return vm.statsSource.WriteCount()
}
return 0
}
func (vm *VM) StoreReadBytes() uint64 {
if vm.statsSource != nil {
return vm.statsSource.ReadSize()
}
return 0
}
func (vm *VM) StoreWriteBytes() uint64 {
if vm.statsSource != nil {
return vm.statsSource.WriteSize()
}
return 0
}
//
// invocation tracking
//
func (vm *VM) startInvocation(msg *InternalMessage) {
invocation := Invocation{Msg: msg}
if len(vm.invocationStack) > 0 {
parent := vm.invocationStack[len(vm.invocationStack)-1]
parent.SubInvocations = append(parent.SubInvocations, &invocation)
} else {
vm.invocations = append(vm.invocations, &invocation)
}
vm.invocationStack = append(vm.invocationStack, &invocation)
}
func (vm *VM) endInvocation(code exitcode.ExitCode, ret cbor.Marshaler) {
curIndex := len(vm.invocationStack) - 1
current := vm.invocationStack[curIndex]
current.Exitcode = code
current.Ret = ret
vm.invocationStack = vm.invocationStack[:curIndex]
}
func (vm *VM) Invocations() []*Invocation {
return vm.invocations
}
func (vm *VM) LastInvocation() *Invocation {
return vm.invocations[len(vm.invocations)-1]
}
//
// implement runtime.Runtime for VM
//
func (vm *VM) Log(_ rt.LogLevel, msg string, args ...interface{}) {
vm.logs = append(vm.logs, fmt.Sprintf(msg, args...))
}
func (vm *VM) GetLogs() []string {
return vm.logs
}
type abort struct {
code exitcode.ExitCode
msg string
}
func (vm *VM) Abortf(errExitCode exitcode.ExitCode, msg string, args ...interface{}) {
panic(abort{errExitCode, fmt.Sprintf(msg, args...)})
}
//
// implement runtime.MessageInfo for InternalMessage
//
var _ runtime.Message = (*InternalMessage)(nil)
// ValueReceived implements runtime.MessageInfo.
func (msg InternalMessage) ValueReceived() abi.TokenAmount {
return msg.value
}
// Caller implements runtime.MessageInfo.
func (msg InternalMessage) Caller() address.Address {
return msg.from
}
// Receiver implements runtime.MessageInfo.
func (msg InternalMessage) Receiver() address.Address {
return msg.to
}