94 lines
2.0 KiB
Go
94 lines
2.0 KiB
Go
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package pool
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import (
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"encoding/hex"
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"sort"
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"sync"
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"time"
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"github.com/Secured-Finance/dione/consensus/policy"
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"github.com/Secured-Finance/dione/types"
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"github.com/Secured-Finance/dione/cache"
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)
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const (
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DefaultTxTTL = 10 * time.Minute
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DefaultTxPrefix = "tx_"
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)
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type Mempool struct {
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m sync.RWMutex
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cache cache.Cache
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txDescriptors []string // list of txs in cache
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}
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func NewMempool(c cache.Cache) (*Mempool, error) {
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mp := &Mempool{
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cache: c,
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}
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var txDesc []string
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err := c.Get("tx_list", &txDesc)
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if err != nil || err != cache.ErrNilValue {
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return nil, err
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}
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mp.txDescriptors = txDesc
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return mp, nil
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}
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func (mp *Mempool) StoreTx(tx *types.Transaction) error {
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mp.m.Lock()
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defer mp.m.Unlock()
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hashStr := hex.EncodeToString(tx.Hash)
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err := mp.cache.StoreWithTTL(DefaultTxPrefix+hashStr, tx, DefaultTxTTL)
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mp.txDescriptors = append(mp.txDescriptors, hashStr)
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mp.cache.Store("tx_list", mp.txDescriptors) // update tx list in cache
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return err
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}
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func (mp *Mempool) GetTxsForNewBlock() []*types.Transaction {
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mp.m.Lock()
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defer mp.m.Unlock()
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var txForBlock []*types.Transaction
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var allTxs []*types.Transaction
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for i, v := range mp.txDescriptors {
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var tx types.Transaction
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err := mp.cache.Get(DefaultTxPrefix+v, &tx)
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if err != nil {
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if err == cache.ErrNilValue {
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// descriptor is broken
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// delete it and update list
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mp.txDescriptors = removeItemFromStringSlice(mp.txDescriptors, i)
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mp.cache.Store("tx_list", mp.txDescriptors) // update tx list in cache
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}
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continue
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}
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allTxs = append(allTxs, &tx)
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}
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sort.Slice(allTxs, func(i, j int) bool {
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return allTxs[i].Timestamp.Before(allTxs[j].Timestamp)
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})
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for i := 0; i < policy.BlockMaxTransactionCount; i++ {
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if len(allTxs) == 0 {
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break
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}
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tx := allTxs[0] // get oldest tx
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allTxs = allTxs[1:] // pop tx
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txForBlock = append(txForBlock, tx)
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}
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return txForBlock
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}
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func removeItemFromStringSlice(s []string, i int) []string {
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s[len(s)-1], s[i] = s[i], s[len(s)-1]
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return s[:len(s)-1]
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}
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