We want to use query-migrate QMP command to check the current migration
state when reconnecting to active domains, but the reply we get to this
command may not contain any statistics at all if called on the
destination host.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
---
 src/qemu/qemu_monitor_json.c | 88 +++++++++++++++++-------------------
 1 file changed, 42 insertions(+), 46 deletions(-)

diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 3a497dceae..df3fdfe4fb 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -3249,56 +3249,52 @@ qemuMonitorJSONGetMigrationStatsReply(virJSONValue *reply,
     case QEMU_MONITOR_MIGRATION_STATUS_PRE_SWITCHOVER:
     case QEMU_MONITOR_MIGRATION_STATUS_DEVICE:
         ram = virJSONValueObjectGetObject(ret, "ram");
-        if (!ram) {
-            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                           _("migration was active, but no RAM info was set"));
-            return -1;
-        }
+        if (ram) {
+            if (virJSONValueObjectGetNumberUlong(ram, "transferred",
+                                                 &stats->ram_transferred) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("migration was active, but RAM 'transferred' "
+                                 "data was missing"));
+                return -1;
+            }
+            if (virJSONValueObjectGetNumberUlong(ram, "remaining",
+                                                 &stats->ram_remaining) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("migration was active, but RAM 'remaining' "
+                                 "data was missing"));
+                return -1;
+            }
+            if (virJSONValueObjectGetNumberUlong(ram, "total",
+                                                 &stats->ram_total) < 0) {
+                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                               _("migration was active, but RAM 'total' "
+                                 "data was missing"));
+                return -1;
+            }
 
-        if (virJSONValueObjectGetNumberUlong(ram, "transferred",
-                                             &stats->ram_transferred) < 0) {
-            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                           _("migration was active, but RAM 'transferred' "
-                             "data was missing"));
-            return -1;
-        }
-        if (virJSONValueObjectGetNumberUlong(ram, "remaining",
-                                             &stats->ram_remaining) < 0) {
-            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                           _("migration was active, but RAM 'remaining' "
-                             "data was missing"));
-            return -1;
-        }
-        if (virJSONValueObjectGetNumberUlong(ram, "total",
-                                             &stats->ram_total) < 0) {
-            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
-                           _("migration was active, but RAM 'total' "
-                             "data was missing"));
-            return -1;
-        }
+            if (virJSONValueObjectGetNumberDouble(ram, "mbps", &mbps) == 0 &&
+                mbps > 0) {
+                /* mpbs from QEMU reports Mbits/s (M as in 10^6 not Mi as 2^20) */
+                stats->ram_bps = mbps * (1000 * 1000 / 8);
+            }
 
-        if (virJSONValueObjectGetNumberDouble(ram, "mbps", &mbps) == 0 &&
-            mbps > 0) {
-            /* mpbs from QEMU reports Mbits/s (M as in 10^6 not Mi as 2^20) */
-            stats->ram_bps = mbps * (1000 * 1000 / 8);
+            if (virJSONValueObjectGetNumberUlong(ram, "duplicate",
+                                                 &stats->ram_duplicate) == 0)
+                stats->ram_duplicate_set = true;
+            ignore_value(virJSONValueObjectGetNumberUlong(ram, "normal",
+                                                          &stats->ram_normal));
+            ignore_value(virJSONValueObjectGetNumberUlong(ram, "normal-bytes",
+                                                          &stats->ram_normal_bytes));
+            ignore_value(virJSONValueObjectGetNumberUlong(ram, "dirty-pages-rate",
+                                                          &stats->ram_dirty_rate));
+            ignore_value(virJSONValueObjectGetNumberUlong(ram, "page-size",
+                                                          &stats->ram_page_size));
+            ignore_value(virJSONValueObjectGetNumberUlong(ram, "dirty-sync-count",
+                                                          &stats->ram_iteration));
+            ignore_value(virJSONValueObjectGetNumberUlong(ram, "postcopy-requests",
+                                                          &stats->ram_postcopy_reqs));
         }
 
-        if (virJSONValueObjectGetNumberUlong(ram, "duplicate",
-                                             &stats->ram_duplicate) == 0)
-            stats->ram_duplicate_set = true;
-        ignore_value(virJSONValueObjectGetNumberUlong(ram, "normal",
-                                                      &stats->ram_normal));
-        ignore_value(virJSONValueObjectGetNumberUlong(ram, "normal-bytes",
-                                                      &stats->ram_normal_bytes));
-        ignore_value(virJSONValueObjectGetNumberUlong(ram, "dirty-pages-rate",
-                                                      &stats->ram_dirty_rate));
-        ignore_value(virJSONValueObjectGetNumberUlong(ram, "page-size",
-                                                      &stats->ram_page_size));
-        ignore_value(virJSONValueObjectGetNumberUlong(ram, "dirty-sync-count",
-                                                      &stats->ram_iteration));
-        ignore_value(virJSONValueObjectGetNumberUlong(ram, "postcopy-requests",
-                                                      &stats->ram_postcopy_reqs));
-
         disk = virJSONValueObjectGetObject(ret, "disk");
         if (disk) {
             rc = virJSONValueObjectGetNumberUlong(disk, "transferred",
-- 
2.35.1

On Tue, May 10, 2022 at 17:21:02 +0200, Jiri Denemark wrote:
> We want to use query-migrate QMP command to check the current migration
> state when reconnecting to active domains, but the reply we get to this
> command may not contain any statistics at all if called on the
> destination host.
> 
> Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
> ---
>  src/qemu/qemu_monitor_json.c | 88 +++++++++++++++++-------------------
>  1 file changed, 42 insertions(+), 46 deletions(-)
> 
> diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
> index 3a497dceae..df3fdfe4fb 100644
> --- a/src/qemu/qemu_monitor_json.c
> +++ b/src/qemu/qemu_monitor_json.c
> @@ -3249,56 +3249,52 @@ qemuMonitorJSONGetMigrationStatsReply(virJSONValue *reply,
>      case QEMU_MONITOR_MIGRATION_STATUS_PRE_SWITCHOVER:
>      case QEMU_MONITOR_MIGRATION_STATUS_DEVICE:
>          ram = virJSONValueObjectGetObject(ret, "ram");
> -        if (!ram) {
> -            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> -                           _("migration was active, but no RAM info was set"));
> -            return -1;
> -        }
> +        if (ram) {
> +            if (virJSONValueObjectGetNumberUlong(ram, "transferred",
> +                                                 &stats->ram_transferred) < 0) {
> +                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> +                               _("migration was active, but RAM 'transferred' "
> +                                 "data was missing"));
> +                return -1;
> +            }
> +            if (virJSONValueObjectGetNumberUlong(ram, "remaining",
> +                                                 &stats->ram_remaining) < 0) {
> +                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> +                               _("migration was active, but RAM 'remaining' "
> +                                 "data was missing"));
> +                return -1;
> +            }
> +            if (virJSONValueObjectGetNumberUlong(ram, "total",
> +                                                 &stats->ram_total) < 0) {
> +                virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
> +                               _("migration was active, but RAM 'total' "
> +                                 "data was missing"));
> +                return -1;
> +            }

Please fix error messages to conform with coding style since you are
touching them.

Reviewed-by: Peter Krempa <pkrempa@redhat.com>