mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2025-01-07 10:12:19 +00:00
93 lines
3.5 KiB
Go
93 lines
3.5 KiB
Go
package state
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import (
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"fmt"
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b "github.com/prysmaticlabs/prysm/beacon-chain/core/blocks"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/randao"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// ExecuteStateTransition defines the procedure for a state transition function.
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// Spec:
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// We now define the state transition function. At a high level the state transition is made up of two parts:
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// - The per-slot transitions, which happens every slot, and only affects a parts of the state.
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// - The per-epoch transitions, which happens at every epoch boundary (i.e. state.slot % EPOCH_LENGTH == 0), and affects the entire state.
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// The per-slot transitions generally focus on verifying aggregate signatures and saving temporary records relating to the per-slot
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// activity in the BeaconState. The per-epoch transitions focus on the validator registry, including adjusting balances and activating
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// and exiting validators, as well as processing crosslinks and managing block justification/finalization.
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func ExecuteStateTransition(
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beaconState *pb.BeaconState,
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block *pb.BeaconBlock,
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prevBlockRoot [32]byte,
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) (*pb.BeaconState, error) {
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var err error
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currentSlot := beaconState.Slot
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beaconState.Slot = currentSlot + 1
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beaconState, err = randao.UpdateRandaoLayers(beaconState, beaconState.Slot)
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if err != nil {
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return nil, fmt.Errorf("unable to update randao layer %v", err)
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}
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beaconState = randao.UpdateRandaoMixes(beaconState)
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beaconState = b.ProcessBlockRoots(beaconState, prevBlockRoot)
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if block != nil {
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beaconState, err = ProcessBlock(beaconState, block)
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if err != nil {
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return nil, fmt.Errorf("unable to process block: %v", err)
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}
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if beaconState.Slot%params.BeaconConfig().EpochLength == 0 {
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beaconState = NewEpochTransition(beaconState)
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}
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}
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return beaconState, nil
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}
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// ProcessBlock creates a new, modified beacon state by applying block operation
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// transformations as defined in the Ethereum Serenity specification, including processing proposer slashings,
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// processing block attestations, and more.
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func ProcessBlock(state *pb.BeaconState, block *pb.BeaconBlock) (*pb.BeaconState, error) {
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if block.Slot != state.Slot {
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return nil, fmt.Errorf(
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"block.slot != state.slot, block.slot = %d, state.slot = %d",
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block.GetSlot(),
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state.GetSlot(),
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)
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}
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// TODO(#781): Verify Proposer Signature.
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var err error
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state = b.ProcessDepositRoots(state, block)
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state, err = b.ProcessBlockRandao(state, block)
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if err != nil {
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return nil, fmt.Errorf("could not verify and process block randao: %v", err)
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}
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state, err = b.ProcessProposerSlashings(state, block)
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if err != nil {
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return nil, fmt.Errorf("could not verify block proposer slashings: %v", err)
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}
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state, err = b.ProcessCasperSlashings(state, block)
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if err != nil {
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return nil, fmt.Errorf("could not verify block casper slashings: %v", err)
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}
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state, err = b.ProcessBlockAttestations(state, block)
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if err != nil {
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return nil, fmt.Errorf("could not process block attestations: %v", err)
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}
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// TODO(#781): Process block validator deposits.
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state, err = b.ProcessValidatorExits(state, block)
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if err != nil {
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return nil, fmt.Errorf("could not process validator exits: %v", err)
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}
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return state, nil
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}
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// NewEpochTransition describes the per epoch operations that are performed on the
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// beacon state.
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func NewEpochTransition(state *pb.BeaconState) *pb.BeaconState {
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// TODO(#1074): This will encompass all the related logic to epoch transitions.
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return state
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}
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