fix: Support configuration modification when active/standby switchove… (#2516)

* fix: Support configuration modification when active/standby switchover occurs

* feat: add 2516 changelog

Author: gitmkn

.changelog/2516.txt

@@ -0,0 +1,3 @@
+```release-note:enhancement
+resource/tencentcloud_mysql_instance: Support configuration modification when active/standby switchover occurs.
+```

tencentcloud/services/cdb/resource_tc_mysql_instance.go

@@ -1083,12 +1083,25 @@ func mysqlAllInstanceRoleUpdate(ctx context.Context, d *schema.ResourceData, met
 				deviceType = v.(string)
 			}
 
-			if v, ok := d.GetOk("first_slave_zone"); ok {
-				firstSlaveZone = v.(string)
-			}
+			if d.HasChange("first_slave_zone") || d.HasChange("second_slave_zone") {
+				if v, ok := d.GetOk("first_slave_zone"); ok {
+					firstSlaveZone = v.(string)
+				}
 
-			if v, ok := d.GetOk("second_slave_zone"); ok {
-				secondSlaveZone = v.(string)
+				if v, ok := d.GetOk("second_slave_zone"); ok {
+					secondSlaveZone = v.(string)
+				}
+			} else {
+				mysqlInfo, e := tencentMsyqlBasicInfoRead(ctx, d, meta, true)
+				if e != nil {
+					return e
+				}
+				if mysqlInfo != nil && mysqlInfo.SlaveInfo != nil && mysqlInfo.SlaveInfo.First != nil && mysqlInfo.SlaveInfo.First.Zone != nil {
+					firstSlaveZone = *mysqlInfo.SlaveInfo.First.Zone
+				}
+				if mysqlInfo != nil && mysqlInfo.SlaveInfo != nil && mysqlInfo.SlaveInfo.Second != nil && mysqlInfo.SlaveInfo.Second.Zone != nil {
+					firstSlaveZone = *mysqlInfo.SlaveInfo.Second.Zone
+				}
 			}
 
 			if v, ok := d.GetOkExists("wait_switch"); ok {

tencentcloud/services/cdb/resource_tc_mysql_instance_test.go

@@ -642,7 +642,7 @@ resource "tencentcloud_mysql_instance" "mysql8" {
 	mem_size          = 1000
 	volume_size       = 25
 	intranet_port     = 3306
-	security_groups   = ["sg-3k7vtgf7"]
+	security_groups   = ["sg-05f7wnhn"]
   
 	tags = {
 	  createdBy = "terraform"