Fantom-foundation/go-lachesis

package gossip

/*
    In LRU cache data stored like pointer
*/

import (
    "github.com/ethereum/go-ethereum/common"

    "github.com/Fantom-foundation/go-lachesis/hash"
    "github.com/Fantom-foundation/go-lachesis/inter/idx"
)

type TxPosition struct {
    Block       idx.Block
    Event       hash.Event
    EventOffset uint32
    BlockOffset uint32
}

// SetTxPosition stores transaction block and position.
func (s *Store) SetTxPosition(txid common.Hash, position *TxPosition) {
    s.set(s.table.TxPositions, txid.Bytes(), position)

    // Add to LRU cache.
    if position != nil && s.cache.TxPositions != nil {
        s.cache.TxPositions.Add(txid.String(), position)
    }
}

// GetTxPosition returns stored transaction block and position.
func (s *Store) GetTxPosition(txid common.Hash) *TxPosition {
    // Get data from LRU cache first.
    if s.cache.TxPositions != nil {
        if c, ok := s.cache.TxPositions.Get(txid.String()); ok {
            if b, ok := c.(*TxPosition); ok {
                return b
            }
        }
    }

    txPosition, _ := s.get(s.table.TxPositions, txid.Bytes(), &TxPosition{}).(*TxPosition)

    // Add to LRU cache.
    if txPosition != nil && s.cache.TxPositions != nil {
        s.cache.TxPositions.Add(txid.String(), txPosition)
    }

    return txPosition
}