mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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81 lines
3.0 KiB
Go
81 lines
3.0 KiB
Go
// Package blocks contains block processing libraries. These libraries
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// process and verify block specific messages such as PoW receipt root,
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// RANDAO, validator deposits, exits and slashing proofs.
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package blocks
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import (
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"context"
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"fmt"
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"time"
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"github.com/ethereum/go-ethereum/common"
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gethTypes "github.com/ethereum/go-ethereum/core/types"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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"github.com/prysmaticlabs/prysm/shared/bytesutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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"github.com/sirupsen/logrus"
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)
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var log = logrus.WithField("prefix", "core/blocks")
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// IsValidBlock ensures that the block is compliant with the block processing validity conditions.
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// Spec:
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// For a beacon chain block, block, to be processed by a node, the following conditions must be met:
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// The parent block with root block.parent_root has been processed and accepted.
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// The node has processed its state up to slot, block.slot - 1.
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// The Ethereum 1.0 block pointed to by the state.processed_pow_receipt_root has been processed and accepted.
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// The node's local clock time is greater than or equal to state.genesis_time + block.slot * SECONDS_PER_SLOT.
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func IsValidBlock(
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ctx context.Context,
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state *pb.BeaconState,
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block *pb.BeaconBlock,
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enablePOWChain bool,
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HasBlock func(hash [32]byte) bool,
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GetPOWBlock func(ctx context.Context, hash common.Hash) (*gethTypes.Block, error),
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genesisTime time.Time) error {
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// Pre-Processing Condition 1:
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// Check that the parent Block has been processed and saved.
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parentRoot := bytesutil.ToBytes32(block.ParentRootHash32)
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parentBlock := HasBlock(parentRoot)
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if !parentBlock {
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return fmt.Errorf("unprocessed parent block as it is not saved in the db: %#x", parentRoot)
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}
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if enablePOWChain {
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h := common.BytesToHash(state.LatestEth1Data.BlockHash32)
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powBlock, err := GetPOWBlock(ctx, h)
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if err != nil {
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return fmt.Errorf("unable to retrieve POW chain reference block: %v", err)
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}
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// Pre-Processing Condition 2:
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// The block pointed to by the state in state.processed_pow_receipt_root has
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// been processed in the ETH 1.0 chain.
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if powBlock == nil {
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return fmt.Errorf("proof-of-Work chain reference in state does not exist: %#x", state.LatestEth1Data.BlockHash32)
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}
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}
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// Pre-Processing Condition 4:
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// The node's local time is greater than or equal to
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// state.genesis_time + (block.slot-GENESIS_SLOT)* SECONDS_PER_SLOT.
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if !IsSlotValid(block.Slot, genesisTime) {
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return fmt.Errorf("slot of block is too high: %d", block.Slot-params.BeaconConfig().GenesisSlot)
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}
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return nil
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}
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// IsSlotValid compares the slot to the system clock to determine if the block is valid.
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func IsSlotValid(slot uint64, genesisTime time.Time) bool {
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secondsPerSlot := time.Duration((slot-params.BeaconConfig().GenesisSlot)*params.BeaconConfig().SecondsPerSlot) * time.Second
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validTimeThreshold := genesisTime.Add(secondsPerSlot)
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now := clock.Now()
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if !now.After(validTimeThreshold) {
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log.Infof("Waiting for slot to be valid. local clock: %v, genesis+slot: %v",
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now, validTimeThreshold)
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}
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return now.After(validTimeThreshold)
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}
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