feat: notice function to notify (in logs) about important changes in migrations

db/migration/20200220143731_change_duration_to_float.go

@@ -2,7 +2,7 @@ package migration
 
 import (
 	"database/sql"
-	"github.com/deluan/navidrome/log"
+
 	"github.com/pressly/goose"
 )
 
@@ -11,7 +11,7 @@ func init() {
 }
 
 func Up20200220143731(tx *sql.Tx) error {
-	log.Warn("This migration will force the next scan to be a full rescan!")
+	notice(tx, "This migration will force the next scan to be a full rescan!")
 	_, err := tx.Exec(`
 create table media_file_dg_tmp
 (

db/migration/migration.go

@@ -0,0 +1,46 @@
+package migration
+
+import (
+	"database/sql"
+	"fmt"
+	"sync"
+
+	"github.com/deluan/navidrome/consts"
+)
+
+// Use this in migrations that need to communicate something important (braking changes, forced reindexes, etc...)
+func notice(tx *sql.Tx, msg string) {
+	if isDBInitialized(tx) {
+		fmt.Printf(`
+*************************************************************************************
+NOTICE: %s
+*************************************************************************************
+
+`, msg)
+	}
+}
+
+var once sync.Once
+
+func isDBInitialized(tx *sql.Tx) (initialized bool) {
+	once.Do(func() {
+		rows, err := tx.Query("select count(*) from property where id='" + consts.InitialSetupFlagKey + "'")
+		checkErr(err)
+		initialized = checkCount(rows) > 0
+	})
+	return initialized
+}
+
+func checkCount(rows *sql.Rows) (count int) {
+	for rows.Next() {
+		err := rows.Scan(&count)
+		checkErr(err)
+	}
+	return count
+}
+
+func checkErr(err error) {
+	if err != nil {
+		panic(err)
+	}
+}