db-wait/pkg/dbwait/dbwait.go
Markus Pesch 760c55f48e
All checks were successful
continuous-integration/drone/push Build is passing
fix(oracle): check via v$instance
2021-09-22 11:27:48 +02:00

86 lines
1.9 KiB
Go

package dbwait
import (
"context"
"database/sql"
"fmt"
"net/url"
"os"
"strings"
"time"
)
func Wait(databaseURL *url.URL, period time.Duration, timeout time.Duration) error {
var err error
var sqlDB *sql.DB
switch databaseURL.Scheme {
case "oracle":
sqlDB, err = sql.Open("oracle", databaseURL.String())
if err != nil {
return err
}
case "postgres":
sqlDB, err = sql.Open("postgres", databaseURL.String())
if err != nil {
return err
}
}
defer sqlDB.Close()
ctx, cancel := context.WithTimeout(context.Background(), timeout)
defer cancel()
ticker := time.NewTicker(time.Nanosecond)
<-ticker.C
LOOP:
for {
select {
case <-ctx.Done():
return ctx.Err()
case <-ticker.C:
queryCtx, queryCancel := context.WithTimeout(ctx, period)
defer queryCancel()
switch databaseURL.Scheme {
case "oracle":
row := sqlDB.QueryRowContext(queryCtx, "SELECT INSTANCE_NAME, STATUS, DATABASE_STATUS FROM V$INSTANCE WHERE INSTANCE_NAME=$1", databaseURL.Path)
var instaceName string
var instanceStatus string
var databaseStatus string
err := row.Scan(instaceName, instanceStatus, databaseStatus)
if err != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", time.Now().String(), err.Error())
ticker.Reset(period)
continue LOOP
}
if strings.ToUpper(instanceStatus) != "OPEN" {
fmt.Fprintf(os.Stderr, "%s: Instance status is not open: %s\n", time.Now().String(), instanceStatus)
ticker.Reset(period)
continue LOOP
}
if strings.ToUpper(databaseStatus) != "OPEN" {
fmt.Fprintf(os.Stderr, "%s: Database status is not active: %s\n", time.Now().String(), databaseStatus)
ticker.Reset(period)
continue LOOP
}
return nil
case "postgres":
row := sqlDB.QueryRowContext(queryCtx, "SELECT 1 AS ROW")
if row.Err() != nil {
fmt.Fprintf(os.Stderr, "%s: %s\n", time.Now().String(), err.Error())
ticker.Reset(period)
continue LOOP
}
return nil
}
}
}
}