random int

go/isuports.go

@@ -7,6 +7,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math/rand"
 	"net/http"
 	"os"
 	"os/exec"
@@ -99,28 +100,7 @@ func createTenantDB(id int64) error {
 
 // システム全体で一意なIDを生成する
 func dispenseID(ctx context.Context) (string, error) {
-	var id int64
-	var lastErr error
-	for i := 0; i < 100; i++ {
-		var ret sql.Result
-		ret, err := adminDB.ExecContext(ctx, "INSERT INTO id_generator (stub) VALUES (?);", "a")
-		if err != nil {
-			if merr, ok := err.(*mysql.MySQLError); ok && merr.Number == 1213 { // deadlock
-				lastErr = fmt.Errorf("error INSERT INTO id_generator: %w", err)
-				continue
-			}
-			return "", fmt.Errorf("error INSERT INTO id_generator: %w", err)
-		}
-		id, err = ret.LastInsertId()
-		if err != nil {
-			return "", fmt.Errorf("error ret.LastInsertId: %w", err)
-		}
-		break
-	}
-	if id != 0 {
-		return fmt.Sprintf("%x", id), nil
-	}
-	return "", lastErr
+	return fmt.Sprintf("%x", rand.Int63()), nil
 }
 
 // 全APIにCache-Control: privateを設定する

sql/init.sql

@@ -1,4 +1,4 @@
 DELETE FROM tenant WHERE id > 100;
 DELETE FROM visit_history WHERE created_at >= '1654041600';
-UPDATE id_generator SET id=2678400000 WHERE stub='a';
+DELETE FROM id_generator;
 ALTER TABLE id_generator AUTO_INCREMENT=2678400000;