fix(oracle): check via v$instance

pkg/dbwait/dbwait.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"net/url"
 	"os"
+	"strings"
 	"time"
 )
 
@@ -44,16 +45,35 @@ LOOP:
 
 			switch databaseURL.Scheme {
 			case "oracle":
-				_, err := sqlDB.QueryContext(queryCtx, "SELECT 1 FROM dual")
+				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":
-				_, err := sqlDB.QueryContext(queryCtx, "SELECT 1 AS ROW")
+				row := sqlDB.QueryRowContext(queryCtx, "SELECT 1 AS ROW")
-				if err != nil {
+				if row.Err() != nil {
 					fmt.Fprintf(os.Stderr, "%s: %s\n", time.Now().String(), err.Error())
 					ticker.Reset(period)
 					continue LOOP