70 lines
1.7 KiB
Go
70 lines
1.7 KiB
Go
package db
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import (
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"blockbook/bchain"
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"blockbook/common"
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"github.com/golang/glog"
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)
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// TxCache is handle to TxCacheServer
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type TxCache struct {
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db *RocksDB
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chain bchain.BlockChain
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metrics *common.Metrics
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enabled bool
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}
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// NewTxCache creates new TxCache interface and returns its handle
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func NewTxCache(db *RocksDB, chain bchain.BlockChain, metrics *common.Metrics, enabled bool) (*TxCache, error) {
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if !enabled {
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glog.Info("txcache: disabled")
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}
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return &TxCache{
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db: db,
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chain: chain,
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metrics: metrics,
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enabled: enabled,
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}, nil
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}
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// GetTransaction returns transaction either from RocksDB or if not present from blockchain
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// it the transaction is confirmed, it is stored in the RocksDB
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func (c *TxCache) GetTransaction(txid string, bestheight uint32) (*bchain.Tx, uint32, error) {
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var tx *bchain.Tx
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var h uint32
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var err error
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if c.enabled {
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tx, h, err = c.db.GetTx(txid)
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if err != nil {
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return nil, 0, err
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}
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if tx != nil {
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// number of confirmations is not stored in cache, they change all the time
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tx.Confirmations = bestheight - h + 1
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c.metrics.TxCacheEfficiency.With(common.Labels{"status": "hit"}).Inc()
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return tx, h, nil
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}
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}
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tx, err = c.chain.GetTransaction(txid)
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if err != nil {
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return nil, 0, err
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}
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c.metrics.TxCacheEfficiency.With(common.Labels{"status": "miss"}).Inc()
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// do not cache mempool transactions
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if tx.Confirmations > 0 {
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// the transaction in the currently best block has 1 confirmation
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h = bestheight - tx.Confirmations + 1
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if c.enabled {
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err = c.db.PutTx(tx, h, tx.Blocktime)
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// do not return caching error, only log it
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if err != nil {
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glog.Error("PutTx error ", err)
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}
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}
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} else {
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h = 0
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}
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return tx, h, nil
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}
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