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extractor.go
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/
extractor.go
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package extractor
import (
"context"
"time"
"github.com/jackc/pgx/v4/pgxpool"
"github.com/likecoin/likecoin-chain-tx-indexer/db"
"github.com/likecoin/likecoin-chain-tx-indexer/logger"
)
var ExtractFunc db.Extractor
// TODO: should we make extractor synchronous with poller instead of async?
func Run(pool *pgxpool.Pool) chan<- int64 {
trigger := make(chan int64, 100)
go func() {
conn, err := db.AcquireFromPool(pool)
if err != nil {
logger.L.Errorw("Failed to acquire connection for extractor", "error", err)
return
}
logger.L.Info("Extractor started")
var finished bool
for {
if err = conn.Ping(context.Background()); err != nil {
conn, err = db.AcquireFromPool(pool)
if err != nil {
logger.L.Errorw("Failed to acquire connection for extractor", "error", err)
time.Sleep(10 * time.Second)
continue
}
}
finished, err = db.Extract(conn, ExtractFunc)
if err != nil {
logger.L.Errorw("Extract error", "error", err)
time.Sleep(5 * time.Second)
continue
}
if finished {
height := <-trigger
logger.L.Debugf("Extractor: trigger by poller on height %d", height)
}
}
}()
return trigger
}
func init() {
ExtractFunc = eventExtractor.Extract
}