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dbconnect.go
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dbconnect.go
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package common
import (
"encoding/gob"
"net"
"time"
"github.com/fkgi/bag"
)
type query struct {
impi string
ch chan bag.AV
}
var (
queue = make(chan query, 1024)
Log = func(...any) {}
interval = time.Second
)
func QueryDB(impi string) bag.AV {
q := query{
impi: impi,
ch: make(chan bag.AV, 1)}
queue <- q
return <-q.ch
}
func ConnectDB(path string) {
for {
Log()
Log("[INFO]", "connecting to DB RPC", path)
c, e := net.Dial("tcp", path)
if e != nil {
Log("[ERR]", "connect to DB RPC failed:", e)
Log("[INFO]", "wait", interval, "for retry to connect to DB RPC")
time.Sleep(interval)
continue
}
dec := gob.NewDecoder(c)
enc := gob.NewEncoder(c)
ticker := time.NewTicker(interval)
for {
var q query
var av bag.AV
select {
case q = <-queue:
case <-ticker.C:
q.impi = ""
q.ch = make(chan bag.AV, 1)
}
if e = enc.Encode(q.impi); e != nil {
Log()
Log("[ERR]", "read from DB RPC failed:", e)
q.ch <- bag.AV{}
break
}
if e = dec.Decode(&av); e != nil {
Log()
Log("[ERR]", "write to DB RPC failed:", e)
q.ch <- bag.AV{}
break
}
q.ch <- av
}
ticker.Stop()
c.Close()
}
}