remote: implement storage lifecycle event APIs

daemon/libvirtd.h

@@ -60,6 +60,8 @@ struct daemonClientPrivate {
     size_t nnetworkEventCallbacks;
     daemonClientEventCallbackPtr *qemuEventCallbacks;
     size_t nqemuEventCallbacks;
+    daemonClientEventCallbackPtr *storageEventCallbacks;
+    size_t nstorageEventCallbacks;
     bool closeRegistered;
 
 # if WITH_SASL

daemon/remote.c

@@ -181,6 +181,32 @@ remoteRelayNetworkEventCheckACL(virNetServerClientPtr client,
     return ret;
 }
 
+static bool
+remoteRelayStoragePoolEventCheckACL(virNetServerClientPtr client,
+                                    virConnectPtr conn,
+                                    virStoragePoolPtr pool)
+{
+    virStoragePoolDef def;
+    virIdentityPtr identity = NULL;
+    bool ret = false;
+
+    /* For now, we just create a virStoragePoolDef with enough contents to
+     * satisfy what viraccessdriverpolkit.c references.  This is a bit
+     * fragile, but I don't know of anything better.  */
+    def.name = pool->name;
+    memcpy(def.uuid, pool->uuid, VIR_UUID_BUFLEN);
+
+    if (!(identity = virNetServerClientGetIdentity(client)))
+        goto cleanup;
+    if (virIdentitySetCurrent(identity) < 0)
+        goto cleanup;
+    ret = virConnectStoragePoolEventRegisterAnyCheckACL(conn, &def);
+
+ cleanup:
+    ignore_value(virIdentitySetCurrent(NULL));
+    virObjectUnref(identity);
+    return ret;
+}
 
 static bool
 remoteRelayDomainQemuMonitorEventCheckACL(virNetServerClientPtr client,
@@ -1236,6 +1262,44 @@ static virConnectNetworkEventGenericCallback networkEventCallbacks[] = {
 
 verify(ARRAY_CARDINALITY(networkEventCallbacks) == VIR_NETWORK_EVENT_ID_LAST);
 
+static int
+remoteRelayStoragePoolEventLifecycle(virConnectPtr conn,
+                                     virStoragePoolPtr pool,
+                                     int event,
+                                     int detail,
+                                     void *opaque)
+{
+    daemonClientEventCallbackPtr callback = opaque;
+    remote_storage_pool_event_lifecycle_msg data;
+
+    if (callback->callbackID < 0 ||
+        !remoteRelayStoragePoolEventCheckACL(callback->client, conn, pool))
+        return -1;
+
+    VIR_DEBUG("Relaying storage pool lifecycle event %d, detail %d, callback %d",
+              event, detail, callback->callbackID);
+
+    /* build return data */
+    memset(&data, 0, sizeof(data));
+    make_nonnull_storage_pool(&data.pool, pool);
+    data.callbackID = callback->callbackID;
+    data.event = event;
+    data.detail = detail;
+
+    remoteDispatchObjectEventSend(callback->client, remoteProgram,
+                                  REMOTE_PROC_STORAGE_POOL_EVENT_LIFECYCLE,
+                                  (xdrproc_t)xdr_remote_storage_pool_event_lifecycle_msg,
+                                  &data);
+
+    return 0;
+}
+
+static virConnectStoragePoolEventGenericCallback storageEventCallbacks[] = {
+    VIR_STORAGE_POOL_EVENT_CALLBACK(remoteRelayStoragePoolEventLifecycle),
+};
+
+verify(ARRAY_CARDINALITY(storageEventCallbacks) == VIR_STORAGE_POOL_EVENT_ID_LAST);
+
 static void
 remoteRelayDomainQemuMonitorEvent(virConnectPtr conn,
                                   virDomainPtr dom,
@@ -1343,6 +1407,21 @@ void remoteClientFreeFunc(void *data)
         }
         VIR_FREE(priv->networkEventCallbacks);
 
+        for (i = 0; i < priv->nstorageEventCallbacks; i++) {
+            int callbackID = priv->storageEventCallbacks[i]->callbackID;
+            if (callbackID < 0) {
+                VIR_WARN("unexpected incomplete storage pool callback %zu", i);
+                continue;
+            }
+            VIR_DEBUG("Deregistering remote storage pool event relay %d",
+                      callbackID);
+            priv->storageEventCallbacks[i]->callbackID = -1;
+            if (virConnectStoragePoolEventDeregisterAny(priv->conn,
+                                                        callbackID) < 0)
+                VIR_WARN("unexpected storage pool event deregister failure");
+        }
+        VIR_FREE(priv->storageEventCallbacks);
+
         for (i = 0; i < priv->nqemuEventCallbacks; i++) {
             int callbackID = priv->qemuEventCallbacks[i]->callbackID;
             if (callbackID < 0) {
@@ -3528,8 +3607,10 @@ remoteDispatchConnectDomainEventRegister(virNetServerPtr server ATTRIBUTE_UNUSED
      * to our array, but on OOM append failure, we'd have to then hope
      * deregister works to undo our register.  So instead we append an
      * incomplete callback to our array, then register, then fix up
-     * our callback; but since VIR_APPEND_ELEMENT clears 'callback' on
-     * success, we use 'ref' to save a copy of the pointer.  */
+     * our callback; or you can use VIR_APPEND_ELEMENT_COPY to avoid
+     * clearing 'callback' and having to juggle the pointer
+     * between 'ref' and 'callback'.
+     */
     if (VIR_ALLOC(callback) < 0)
         goto cleanup;
     callback->client = client;
@@ -5434,6 +5515,127 @@ remoteDispatchConnectNetworkEventDeregisterAny(virNetServerPtr server ATTRIBUTE_
     return rv;
 }
 
+static int
+remoteDispatchConnectStoragePoolEventRegisterAny(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                                 virNetServerClientPtr client,
+                                                 virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                                 virNetMessageErrorPtr rerr ATTRIBUTE_UNUSED,
+                                                 remote_connect_storage_pool_event_register_any_args *args,
+                                                 remote_connect_storage_pool_event_register_any_ret *ret)
+{
+    int callbackID;
+    int rv = -1;
+    daemonClientEventCallbackPtr callback = NULL;
+    daemonClientEventCallbackPtr ref;
+    struct daemonClientPrivate *priv =
+        virNetServerClientGetPrivateData(client);
+    virStoragePoolPtr  pool = NULL;
+
+    if (!priv->conn) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+        goto cleanup;
+    }
+
+    virMutexLock(&priv->lock);
+
+    if (args->pool &&
+        !(pool = get_nonnull_storage_pool(priv->conn, *args->pool)))
+        goto cleanup;
+
+    if (args->eventID >= VIR_STORAGE_POOL_EVENT_ID_LAST || args->eventID < 0) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("unsupported storage pool event ID %d"), args->eventID);
+        goto cleanup;
+    }
+
+    /* If we call register first, we could append a complete callback
+     * to our array, but on OOM append failure, we'd have to then hope
+     * deregister works to undo our register.  So instead we append an
+     * incomplete callback to our array, then register, then fix up
+     * our callback; but since VIR_APPEND_ELEMENT clears 'callback' on
+     * success, we use 'ref' to save a copy of the pointer.  */
+    if (VIR_ALLOC(callback) < 0)
+        goto cleanup;
+    callback->client = client;
+    callback->eventID = args->eventID;
+    callback->callbackID = -1;
+    ref = callback;
+    if (VIR_APPEND_ELEMENT(priv->storageEventCallbacks,
+                           priv->nstorageEventCallbacks,
+                           callback) < 0)
+        goto cleanup;
+
+    if ((callbackID = virConnectStoragePoolEventRegisterAny(priv->conn,
+                                                            pool,
+                                                            args->eventID,
+                                                            storageEventCallbacks[args->eventID],
+                                                            ref,
+                                                            remoteEventCallbackFree)) < 0) {
+        VIR_SHRINK_N(priv->storageEventCallbacks,
+                     priv->nstorageEventCallbacks, 1);
+        callback = ref;
+        goto cleanup;
+    }
+
+    ref->callbackID = callbackID;
+    ret->callbackID = callbackID;
+
+    rv = 0;
+
+ cleanup:
+    VIR_FREE(callback);
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virObjectUnref(pool);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
+static int
+remoteDispatchConnectStoragePoolEventDeregisterAny(virNetServerPtr server ATTRIBUTE_UNUSED,
+                                               virNetServerClientPtr client,
+                                               virNetMessagePtr msg ATTRIBUTE_UNUSED,
+                                               virNetMessageErrorPtr rerr ATTRIBUTE_UNUSED,
+                                               remote_connect_storage_pool_event_deregister_any_args *args)
+{
+    int rv = -1;
+    size_t i;
+    struct daemonClientPrivate *priv =
+        virNetServerClientGetPrivateData(client);
+
+    if (!priv->conn) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("connection not open"));
+        goto cleanup;
+    }
+
+    virMutexLock(&priv->lock);
+
+    for (i = 0; i < priv->nstorageEventCallbacks; i++) {
+        if (priv->storageEventCallbacks[i]->callbackID == args->callbackID)
+            break;
+    }
+    if (i == priv->nstorageEventCallbacks) {
+        virReportError(VIR_ERR_INTERNAL_ERROR,
+                       _("storage pool event callback %d not registered"),
+                       args->callbackID);
+        goto cleanup;
+    }
+
+    if (virConnectStoragePoolEventDeregisterAny(priv->conn, args->callbackID) < 0)
+        goto cleanup;
+
+    VIR_DELETE_ELEMENT(priv->storageEventCallbacks, i,
+                       priv->nstorageEventCallbacks);
+
+    rv = 0;
+
+ cleanup:
+    if (rv < 0)
+        virNetMessageSaveError(rerr);
+    virMutexUnlock(&priv->lock);
+    return rv;
+}
+
 
 static int
 qemuDispatchConnectDomainMonitorEventRegister(virNetServerPtr server ATTRIBUTE_UNUSED,