mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
synced 2025-01-04 00:44:27 +00:00
67 lines
2.3 KiB
Go
67 lines
2.3 KiB
Go
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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"github.com/prysmaticlabs/prysm/beacon-chain/core/types"
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)
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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 * SLOT_DURATION.
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func IsValidBlock(
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ctx context.Context,
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state *types.BeaconState,
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block *types.Block,
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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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parentBlock := HasBlock(block.ParentHash())
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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", block.ParentHash())
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}
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// Pre-Processing Condition 2:
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// The state is updated up to block.slot -1.
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if state.Slot() != block.SlotNumber()-1 {
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return fmt.Errorf(
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"block slot is not valid %d as it is supposed to be %d", block.SlotNumber(), state.Slot()+1)
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}
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if enablePOWChain {
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powBlock, err := GetPOWBlock(ctx, state.ProcessedPowReceiptRootHash32())
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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 3:
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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.ProcessedPowReceiptRootHash32())
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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 * SLOT_DURATION.
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if !block.IsSlotValid(genesisTime) {
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return fmt.Errorf("slot of block is too high: %d", block.SlotNumber())
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}
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return nil
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}
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