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payload.go
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payload.go
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package blocks
import (
"bytes"
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/helpers"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/core/time"
"github.com/prysmaticlabs/prysm/v4/beacon-chain/state"
consensus_types "github.com/prysmaticlabs/prysm/v4/consensus-types"
"github.com/prysmaticlabs/prysm/v4/consensus-types/blocks"
"github.com/prysmaticlabs/prysm/v4/consensus-types/interfaces"
"github.com/prysmaticlabs/prysm/v4/encoding/bytesutil"
"github.com/prysmaticlabs/prysm/v4/runtime/version"
"github.com/prysmaticlabs/prysm/v4/time/slots"
)
var (
ErrInvalidPayloadBlockHash = errors.New("invalid payload block hash")
ErrInvalidPayloadTimeStamp = errors.New("invalid payload timestamp")
ErrInvalidPayloadPrevRandao = errors.New("invalid payload previous randao")
)
// IsMergeTransitionComplete returns true if the transition to Bellatrix has completed.
// Meaning the payload header in beacon state is not `ExecutionPayloadHeader()` (i.e. not empty).
//
// Spec code:
// def is_merge_transition_complete(state: BeaconState) -> bool:
//
// return state.latest_execution_payload_header != ExecutionPayloadHeader()
func IsMergeTransitionComplete(st state.BeaconState) (bool, error) {
if st == nil {
return false, errors.New("nil state")
}
if IsPreBellatrixVersion(st.Version()) {
return false, nil
}
if st.Version() > version.Bellatrix {
return true, nil
}
h, err := st.LatestExecutionPayloadHeader()
if err != nil {
return false, err
}
isEmpty, err := blocks.IsEmptyExecutionData(h)
if err != nil {
return false, err
}
return !isEmpty, nil
}
// IsExecutionBlock returns whether the block has a non-empty ExecutionPayload.
//
// Spec code:
// def is_execution_block(block: ReadOnlyBeaconBlock) -> bool:
//
// return block.body.execution_payload != ExecutionPayload()
func IsExecutionBlock(body interfaces.ReadOnlyBeaconBlockBody) (bool, error) {
if body == nil {
return false, errors.New("nil block body")
}
payload, err := body.Execution()
switch {
case errors.Is(err, consensus_types.ErrUnsupportedField):
return false, nil
case err != nil:
return false, err
default:
}
isEmpty, err := blocks.IsEmptyExecutionData(payload)
if err != nil {
return false, err
}
return !isEmpty, nil
}
// IsExecutionEnabled returns true if the beacon chain can begin executing.
// Meaning the payload header is beacon state is non-empty or the payload in block body is non-empty.
//
// Spec code:
// def is_execution_enabled(state: BeaconState, body: ReadOnlyBeaconBlockBody) -> bool:
//
// return is_merge_block(state, body) or is_merge_complete(state)
func IsExecutionEnabled(st state.BeaconState, body interfaces.ReadOnlyBeaconBlockBody) (bool, error) {
if st == nil || body == nil {
return false, errors.New("nil state or block body")
}
if IsPreBellatrixVersion(st.Version()) {
return false, nil
}
header, err := st.LatestExecutionPayloadHeader()
if err != nil {
return false, err
}
return IsExecutionEnabledUsingHeader(header, body)
}
// IsExecutionEnabledUsingHeader returns true if the execution is enabled using post processed payload header and block body.
// This is an optimized version of IsExecutionEnabled where beacon state is not required as an argument.
func IsExecutionEnabledUsingHeader(header interfaces.ExecutionData, body interfaces.ReadOnlyBeaconBlockBody) (bool, error) {
isEmpty, err := blocks.IsEmptyExecutionData(header)
if err != nil {
return false, err
}
if !isEmpty {
return true, nil
}
return IsExecutionBlock(body)
}
// IsPreBellatrixVersion returns true if input version is before bellatrix fork.
func IsPreBellatrixVersion(v int) bool {
return v < version.Bellatrix
}
// ValidatePayloadWhenMergeCompletes validates if payload is valid versus input beacon state.
// These validation steps ONLY apply to post merge.
//
// Spec code:
//
// # Verify consistency of the parent hash with respect to the previous execution payload header
// if is_merge_complete(state):
// assert payload.parent_hash == state.latest_execution_payload_header.block_hash
func ValidatePayloadWhenMergeCompletes(st state.BeaconState, payload interfaces.ExecutionData) error {
complete, err := IsMergeTransitionComplete(st)
if err != nil {
return err
}
if !complete {
return nil
}
header, err := st.LatestExecutionPayloadHeader()
if err != nil {
return err
}
if !bytes.Equal(payload.ParentHash(), header.BlockHash()) {
return ErrInvalidPayloadBlockHash
}
return nil
}
// ValidatePayload validates if payload is valid versus input beacon state.
// These validation steps apply to both pre merge and post merge.
//
// Spec code:
//
// # Verify random
// assert payload.random == get_randao_mix(state, get_current_epoch(state))
// # Verify timestamp
// assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
func ValidatePayload(st state.BeaconState, payload interfaces.ExecutionData) error {
random, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
if err != nil {
return err
}
if !bytes.Equal(payload.PrevRandao(), random) {
return ErrInvalidPayloadPrevRandao
}
t, err := slots.ToTime(st.GenesisTime(), st.Slot())
if err != nil {
return err
}
if payload.Timestamp() != uint64(t.Unix()) {
return ErrInvalidPayloadTimeStamp
}
return nil
}
// ProcessPayload processes input execution payload using beacon state.
// ValidatePayloadWhenMergeCompletes validates if payload is valid versus input beacon state.
// These validation steps ONLY apply to post merge.
//
// Spec code:
// def process_execution_payload(state: BeaconState, payload: ExecutionPayload, execution_engine: ExecutionEngine) -> None:
//
// # Verify consistency of the parent hash with respect to the previous execution payload header
// if is_merge_complete(state):
// assert payload.parent_hash == state.latest_execution_payload_header.block_hash
// # Verify random
// assert payload.random == get_randao_mix(state, get_current_epoch(state))
// # Verify timestamp
// assert payload.timestamp == compute_timestamp_at_slot(state, state.slot)
// # Verify the execution payload is valid
// assert execution_engine.execute_payload(payload)
// # Cache execution payload header
// state.latest_execution_payload_header = ExecutionPayloadHeader(
// parent_hash=payload.parent_hash,
// FeeRecipient=payload.FeeRecipient,
// state_root=payload.state_root,
// receipt_root=payload.receipt_root,
// logs_bloom=payload.logs_bloom,
// random=payload.random,
// block_number=payload.block_number,
// gas_limit=payload.gas_limit,
// gas_used=payload.gas_used,
// timestamp=payload.timestamp,
// extra_data=payload.extra_data,
// base_fee_per_gas=payload.base_fee_per_gas,
// block_hash=payload.block_hash,
// transactions_root=hash_tree_root(payload.transactions),
// )
func ProcessPayload(st state.BeaconState, payload interfaces.ExecutionData) (state.BeaconState, error) {
var err error
if st.Version() >= version.Capella {
st, err = ProcessWithdrawals(st, payload)
if err != nil {
return nil, errors.Wrap(err, "could not process withdrawals")
}
}
/*
if err := ValidatePayloadWhenMergeCompletes(st, payload); err != nil {
return nil, err
}
if err := ValidatePayload(st, payload); err != nil {
return nil, err
}
*/
if err := st.SetLatestExecutionPayloadHeader(payload); err != nil {
return nil, err
}
return st, nil
}
// ValidatePayloadHeaderWhenMergeCompletes validates the payload header when the merge completes.
func ValidatePayloadHeaderWhenMergeCompletes(st state.BeaconState, header interfaces.ExecutionData) error {
// Skip validation if the state is not merge compatible.
complete, err := IsMergeTransitionComplete(st)
if err != nil {
return err
}
if !complete {
return nil
}
// Validate current header's parent hash matches state header's block hash.
h, err := st.LatestExecutionPayloadHeader()
if err != nil {
return err
}
if !bytes.Equal(header.ParentHash(), h.BlockHash()) {
return ErrInvalidPayloadBlockHash
}
return nil
}
// ValidatePayloadHeader validates the payload header.
func ValidatePayloadHeader(st state.BeaconState, header interfaces.ExecutionData) error {
// Validate header's random mix matches with state in current epoch
random, err := helpers.RandaoMix(st, time.CurrentEpoch(st))
if err != nil {
return err
}
if !bytes.Equal(header.PrevRandao(), random) {
return ErrInvalidPayloadPrevRandao
}
// Validate header's timestamp matches with state in current slot.
t, err := slots.ToTime(st.GenesisTime(), st.Slot())
if err != nil {
return err
}
if header.Timestamp() != uint64(t.Unix()) {
return ErrInvalidPayloadTimeStamp
}
return nil
}
// ProcessPayloadHeader processes the payload header.
func ProcessPayloadHeader(st state.BeaconState, header interfaces.ExecutionData) (state.BeaconState, error) {
var err error
if st.Version() >= version.Capella {
st, err = ProcessWithdrawals(st, header)
if err != nil {
return nil, errors.Wrap(err, "could not process withdrawals")
}
}
/*
if err := ValidatePayloadHeaderWhenMergeCompletes(st, header); err != nil {
return nil, err
}
if err := ValidatePayloadHeader(st, header); err != nil {
return nil, err
}
*/
if err := st.SetLatestExecutionPayloadHeader(header); err != nil {
return nil, err
}
return st, nil
}
// GetBlockPayloadHash returns the hash of the execution payload of the block
func GetBlockPayloadHash(blk interfaces.ReadOnlyBeaconBlock) ([32]byte, error) {
var payloadHash [32]byte
if IsPreBellatrixVersion(blk.Version()) {
return payloadHash, nil
}
payload, err := blk.Body().Execution()
if err != nil {
return payloadHash, err
}
return bytesutil.ToBytes32(payload.BlockHash()), nil
}