fix(mysql): enforce non-zero initial wait time for CDC setup

drivers/mysql/internal/mysql.go

@@ -102,7 +102,8 @@ func (m *MySQL) Setup(ctx context.Context) error {
 	if err := client.PingContext(ctx); err != nil {
 		return fmt.Errorf("failed to ping database: %s", err)
 	}
-	// TODO: If CDC config exists and permission check fails, fail the setup
+	m.client = client
+
 	found, _ := utils.IsOfType(m.config.UpdateMethod, "initial_wait_time")
 	if found {
 		logger.Info("Found CDC Configuration")
@@ -112,21 +113,41 @@ func (m *MySQL) Setup(ctx context.Context) error {
 		}
 		if cdc.InitialWaitTime <= 0 {
 			// Fail the setup if initial_wait_time is 0 or negative
-			return fmt.Errorf("Failed to setup CDC: Initial wait time must be greater than 0")
+			return fmt.Errorf("failed to setup CDC: Initial wait time must be greater than 0")
+		}
+
+		// Permission check for CDC
+		var grants []string
+		if err := client.SelectContext(ctx, &grants, "SHOW GRANTS FOR CURRENT_USER()"); err != nil {
+			return fmt.Errorf("failed to get grants for current user: %s", err)
+		}
+		grantStr := strings.ToUpper(strings.Join(grants, " "))
+
+		if !strings.Contains(grantStr, "ALL PRIVILEGES") {
+			permissions := []string{"SELECT", "REPLICATION SLAVE", "REPLICATION CLIENT"}
+			for _, perm := range permissions {
+				if !strings.Contains(grantStr, perm) {
+					return fmt.Errorf("missing required permissions for CDC: SELECT, REPLICATION SLAVE, or REPLICATION CLIENT")
+				}
+			}
+		}
+
+		// Enable CDC support if binlog is configured
+		cdcSupported, err := m.IsCDCSupported(ctx)
+		if err != nil {
+			return err
+		}
+		if !cdcSupported {
+			return fmt.Errorf("failed to setup CDC")
 		}
+
+		logger.Infof("CDC setup done with initial wait time %d", cdc.InitialWaitTime)
+
+		m.CDCSupport = true
 		m.cdcConfig = *cdc
 	}
-	m.client = client
+
 	m.config.RetryCount = utils.Ternary(m.config.RetryCount <= 0, 1, m.config.RetryCount+1).(int)
-	// Enable CDC support if binlog is configured
-	cdcSupported, err := m.IsCDCSupported(ctx)
-	if err != nil {
-		logger.Warnf("failed to check CDC support: %s", err)
-	}
-	if !cdcSupported {
-		logger.Warnf("CDC is not supported")
-	}
-	m.CDCSupport = cdcSupported
 	return nil
 }
 
@@ -254,8 +275,7 @@ func (m *MySQL) IsCDCSupported(ctx context.Context) (bool, error) {
 		}
 
 		if strings.ToUpper(value) != expectedValue {
-			logger.Warnf(warnMessage)
-			return false, nil
+			return false, fmt.Errorf(warnMessage)
 		}
 
 		return true, nil