53 lines
1.3 KiB
Go
53 lines
1.3 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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}
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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) (*TxCache, error) {
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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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}, 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, error) {
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tx, h, err := c.db.GetTx(txid)
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if err != nil {
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return nil, err
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}
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if tx != nil {
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tx.Confirmations = bestheight - h
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c.metrics.TxCacheEfficiency.With(common.Labels{"status": "hit"}).Inc()
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return tx, nil
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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, 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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err = c.db.PutTx(tx, bestheight-tx.Confirmations, 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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return tx, nil
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}
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