qemuMonitorGetDeviceProps: Return data in a hash table

Create a hash table of device property names which also stores the
corresponding JSON object so that the detection code can look at the
recently added 'default-value' field and possibly others.
Signed-off-by: NPeter Krempa <pkrempa@redhat.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_capabilities.c

@@ -2580,20 +2580,24 @@ virQEMUCapsProbeQMPDeviceProperties(virQEMUCapsPtr qemuCaps,
 
     for (i = 0; i < G_N_ELEMENTS(virQEMUCapsDeviceProps); i++) {
         virQEMUCapsObjectTypeProps *device = virQEMUCapsDeviceProps + i;
-        VIR_AUTOSTRINGLIST values = NULL;
-        int nvalues;
+        g_autoptr(virHashTable) qemuprops = NULL;
+        size_t j;
 
         if (device->capsCondition >= 0 &&
             !virQEMUCapsGet(qemuCaps, device->capsCondition))
             continue;
 
-        if ((nvalues = qemuMonitorGetDeviceProps(mon, device->type, &values)) < 0)
+        if (!(qemuprops = qemuMonitorGetDeviceProps(mon, device->type)))
             return -1;
 
-        virQEMUCapsProcessStringFlags(qemuCaps,
-                                      device->nprops,
-                                      device->props,
-                                      nvalues, values);
+        for (j = 0; j < device->nprops; j++) {
+            virJSONValuePtr entry = virHashLookup(qemuprops, device->props[j].value);
+
+            if (!entry)
+                continue;
+
+            virQEMUCapsSet(qemuCaps, device->props[j].flag);
+        }
     }
 
     return 0;

src/qemu/qemu_monitor.c

@@ -3764,16 +3764,15 @@ qemuMonitorGetObjectTypes(qemuMonitorPtr mon,
 }
 
 
-int
+virHashTablePtr
 qemuMonitorGetDeviceProps(qemuMonitorPtr mon,
-                          const char *device,
-                          char ***props)
+                          const char *device)
 {
-    VIR_DEBUG("device=%s props=%p", device, props);
+    VIR_DEBUG("device=%s", device);
 
-    QEMU_CHECK_MONITOR(mon);
+    QEMU_CHECK_MONITOR_NULL(mon);
 
-    return qemuMonitorJSONGetDeviceProps(mon, device, props);
+    return qemuMonitorJSONGetDeviceProps(mon, device);
 }
 
 

src/qemu/qemu_monitor.h

@@ -1203,9 +1203,8 @@ int qemuMonitorGetKVMState(qemuMonitorPtr mon,
 
 int qemuMonitorGetObjectTypes(qemuMonitorPtr mon,
                               char ***types);
-int qemuMonitorGetDeviceProps(qemuMonitorPtr mon,
-                              const char *device,
-                              char ***props);
+virHashTablePtr qemuMonitorGetDeviceProps(qemuMonitorPtr mon,
+                                          const char *device);
 int qemuMonitorGetObjectProps(qemuMonitorPtr mon,
                               const char *object,
                               char ***props);

src/qemu/qemu_monitor_json.c

@@ -6745,28 +6745,56 @@ qemuMonitorJSONParsePropsList(virJSONValuePtr cmd,
 }
 
 
-int
+static int
+qemuMonitorJSONGetDevicePropsWorker(size_t pos G_GNUC_UNUSED,
+                                    virJSONValuePtr item,
+                                    void *opaque)
+{
+    const char *name = virJSONValueObjectGetString(item, "name");
+    virHashTablePtr devices = opaque;
+
+    if (!name) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("reply data was missing 'name'"));
+        return -1;
+    }
+
+    if (virHashAddEntry(devices, name, item) < 0)
+        return -1;
+
+    return 0;
+}
+
+
+virHashTablePtr
 qemuMonitorJSONGetDeviceProps(qemuMonitorPtr mon,
-                              const char *device,
-                              char ***props)
+                              const char *device)
 {
+    g_autoptr(virHashTable) props = virHashNew(virJSONValueHashFree);
     g_autoptr(virJSONValue) cmd = NULL;
     g_autoptr(virJSONValue) reply = NULL;
 
-    *props = NULL;
-
     if (!(cmd = qemuMonitorJSONMakeCommand("device-list-properties",
                                            "s:typename", device,
                                            NULL)))
-        return -1;
+        return NULL;
 
     if (qemuMonitorJSONCommand(mon, cmd, &reply) < 0)
-        return -1;
+        return NULL;
 
+    /* return empty hash */
     if (qemuMonitorJSONHasError(reply, "DeviceNotFound"))
-        return 0;
+        return g_steal_pointer(&props);
+
+    if (qemuMonitorJSONCheckReply(cmd, reply, VIR_JSON_TYPE_ARRAY) < 0)
+        return NULL;
+
+    if (virJSONValueArrayForeachSteal(virJSONValueObjectGetArray(reply, "return"),
+                                      qemuMonitorJSONGetDevicePropsWorker,
+                                      props) < 0)
+        return NULL;
 
-    return qemuMonitorJSONParsePropsList(cmd, reply, NULL, props);
+    return g_steal_pointer(&props);
 }
 
 

src/qemu/qemu_monitor_json.h

@@ -487,10 +487,9 @@ int qemuMonitorJSONSetObjectProperty(qemuMonitorPtr mon,
                                      qemuMonitorJSONObjectPropertyPtr prop)
     ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3) ATTRIBUTE_NONNULL(4);
 
-int qemuMonitorJSONGetDeviceProps(qemuMonitorPtr mon,
-                                  const char *device,
-                                  char ***props)
-    ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3);
+virHashTablePtr qemuMonitorJSONGetDeviceProps(qemuMonitorPtr mon,
+                                              const char *device)
+    ATTRIBUTE_NONNULL(2);
 int qemuMonitorJSONGetObjectProps(qemuMonitorPtr mon,
                                   const char *object,
                                   char ***props)