// This contains actor things that are _outside_ of VM exection.
// The VM uses this to execute abi.
import abi "github.com/filecoin-project/specs-actors/actors/abi"
import actor "github.com/filecoin-project/specs-actors/actors"
import cid "github.com/ipfs/go-cid"
// CallSeqNum is an invocation (Call) sequence (Seq) number (Num).
// This is a value used for securing against replay attacks:
// each AccountActor (user) invocation must have a unique CallSeqNum
// value. The sequenctiality of the numbers is used to make it
// easy to verify, and to order messages.
//
// Q&A
// - > Does it have to be sequential?
// No, a random nonce could work against replay attacks, but
// making it sequential makes it much easier to verify.
// - > Can it be used to order events?
// Yes, a user may submit N separate messages with increasing
// sequence number, causing them to execute in order.
//
type CallSeqNum int64
// Actor is a base computation object in the Filecoin VM. Similar
// to Actors in the Actor Model (programming), or Objects in Object-
// Oriented Programming, or Ethereum Contracts in the EVM.
//
// ActorState represents the on-chain storage all actors keep.
type ActorState struct {
// Identifies the code this actor executes.
CodeID abi.ActorCodeID
// CID of the root of optional actor-specific sub-state.
State actor.ActorSubstateCID
// Balance of tokens held by this actor.
Balance abi.TokenAmount
// Expected sequence number of the next message sent by this actor.
// Initially zero, incremented when an account actor originates a top-level message.
// Always zero for other abi.
CallSeqNum
}
type ActorSystemStateCID cid.Cid
// ActorState represents the on-chain storage actors keep. This type is a
// union of concrete types, for each of the Actors:
// - InitActor
// - CronActor
// - AccountActor
// - PaymentChannelActor
// - StoragePowerActor
// - StorageMinerActor
// - StroageMarketActor
//
// TODO: move this into a directory inside the VM that patches in all
// the actors from across the system. this will be where we declare/mount
// all actors in the VM.
// type ActorState union {
// Init struct {
// AddressMap {addr.Address: ActorID}
// NextID ActorID
// }
// }
