mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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110 lines
3.4 KiB
Go
110 lines
3.4 KiB
Go
package powchain
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import (
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"context"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/pkg/errors"
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"go.opencensus.io/trace"
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)
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// BlockExists returns true if the block exists, it's height and any possible error encountered.
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func (s *Service) BlockExists(ctx context.Context, hash common.Hash) (bool, *big.Int, error) {
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ctx, span := trace.StartSpan(ctx, "beacon-chain.web3service.BlockExists")
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defer span.End()
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if exists, blkInfo, err := s.blockCache.BlockInfoByHash(hash); exists || err != nil {
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if err != nil {
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return false, nil, err
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}
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span.AddAttributes(trace.BoolAttribute("blockCacheHit", true))
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return true, blkInfo.Number, nil
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}
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span.AddAttributes(trace.BoolAttribute("blockCacheHit", false))
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block, err := s.blockFetcher.BlockByHash(ctx, hash)
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if err != nil {
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return false, big.NewInt(0), errors.Wrap(err, "could not query block with given hash")
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}
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if err := s.blockCache.AddBlock(block); err != nil {
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return false, big.NewInt(0), err
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}
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return true, block.Number(), nil
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}
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// BlockHashByHeight returns the block hash of the block at the given height.
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func (s *Service) BlockHashByHeight(ctx context.Context, height *big.Int) (common.Hash, error) {
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ctx, span := trace.StartSpan(ctx, "beacon-chain.web3service.BlockHashByHeight")
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defer span.End()
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if exists, blkInfo, err := s.blockCache.BlockInfoByHeight(height); exists || err != nil {
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if err != nil {
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return [32]byte{}, err
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}
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span.AddAttributes(trace.BoolAttribute("blockCacheHit", true))
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return blkInfo.Hash, nil
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}
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span.AddAttributes(trace.BoolAttribute("blockCacheHit", false))
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block, err := s.blockFetcher.BlockByNumber(ctx, height)
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if err != nil {
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return [32]byte{}, errors.Wrap(err, "could not query block with given height")
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}
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if err := s.blockCache.AddBlock(block); err != nil {
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return [32]byte{}, err
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}
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return block.Hash(), nil
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}
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// BlockTimeByHeight fetches an eth1.0 block timestamp by its height.
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func (s *Service) BlockTimeByHeight(ctx context.Context, height *big.Int) (uint64, error) {
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ctx, span := trace.StartSpan(ctx, "beacon-chain.web3service.BlockTimeByHeight")
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defer span.End()
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block, err := s.blockFetcher.BlockByNumber(ctx, height)
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if err != nil {
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return 0, errors.Wrap(err, "could not query block with given height")
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}
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return block.Time(), nil
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}
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// BlockNumberByTimestamp returns the most recent block number up to a given timestamp.
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// This is a naive implementation that will use O(ETH1_FOLLOW_DISTANCE) calls to cache
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// or ETH1. This is called for multiple times but only changes every
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// SlotsPerEth1VotingPeriod (1024 slots) so the whole method should be cached.
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func (s *Service) BlockNumberByTimestamp(ctx context.Context, time uint64) (*big.Int, error) {
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ctx, span := trace.StartSpan(ctx, "beacon-chain.web3service.BlockByTimestamp")
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defer span.End()
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head, err := s.blockFetcher.BlockByNumber(ctx, nil)
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if err != nil {
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return nil, err
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}
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for bn := head.Number(); ; bn = big.NewInt(0).Sub(bn, big.NewInt(1)) {
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if ctx.Err() != nil {
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return nil, ctx.Err()
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}
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exists, info, err := s.blockCache.BlockInfoByHeight(bn)
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if err != nil {
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return nil, err
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}
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if !exists {
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blk, err := s.blockFetcher.BlockByNumber(ctx, bn)
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if err != nil {
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return nil, err
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}
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if err := s.blockCache.AddBlock(blk); err != nil {
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return nil, err
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}
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info = blockToBlockInfo(blk)
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}
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if info.Time <= time {
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return info.Number, nil
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}
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}
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}
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