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[libvirt] [PATCHv2 4/6] event: client RPC protocol tweaks for domain lifecycle events



The counterpart to the server RPC additions; here, a single
function can serve both old and new calls, while incoming
events must be serviced by two different functions.  Again,
some wise choices in our XDR makes event sharing easier.

While this only supports lifecycle events, it covers the
harder part of how Register and RegisterAny interact; the
remaining 15 events will be a mechanical change in a later
patch.  For Register, we now have a callbackID locally for
more efficient cleanup if the RPC fails; we also prefer to
use the newer RPC where we know it is supported (the older
RPC must be used if we don't know if RegisterAny is
supported).

* src/remote/remote_driver.c (remoteEvents): Register new RPC
event handler.
(remoteDomainBuildEventLifecycle): Move guts...
(remoteDomainBuildEventLifecycleHelper): ...here.
(remoteDomainBuildEventCallbackLifecycle): New function.
(remoteConnectDomainEventRegister)
(remoteConnectDomainEventDeregister)
(remoteConnectDomainEventRegisterAny)
(remoteConnectDomainEventDeregisterAny): Use new RPC when supported.
---
 src/remote/remote_driver.c | 191 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 157 insertions(+), 34 deletions(-)

diff --git a/src/remote/remote_driver.c b/src/remote/remote_driver.c
index b0257c2..35baaeb 100644
--- a/src/remote/remote_driver.c
+++ b/src/remote/remote_driver.c
@@ -209,6 +209,11 @@ remoteDomainBuildEventLifecycle(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
                                 virNetClientPtr client ATTRIBUTE_UNUSED,
                                 void *evdata, void *opaque);
 static void
+remoteDomainBuildEventCallbackLifecycle(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
+                                        virNetClientPtr client ATTRIBUTE_UNUSED,
+                                        void *evdata, void *opaque);
+
+static void
 remoteDomainBuildEventReboot(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
                              virNetClientPtr client ATTRIBUTE_UNUSED,
                              void *evdata, void *opaque);
@@ -345,10 +350,23 @@ static virNetClientProgramEvent remoteEvents[] = {
       remoteDomainBuildEventDeviceRemoved,
       sizeof(remote_domain_event_device_removed_msg),
       (xdrproc_t)xdr_remote_domain_event_device_removed_msg },
+    /* All events above here are legacy events, missing the callback
+     * ID, which means the server has a single global registration and
+     * we do full filtering in the client.  If the server lacks
+     * VIR_DRV_FEATURE_REMOTE_EVENT_CALLBACK, those are the only
+     * events we should ever receive.  Conversely, all events below
+     * here should only be triggered by modern servers, and all
+     * contain a callbackID.  Although we have to duplicate the first
+     * 16 domain events in both styles for back-compat, any future
+     * domain event additions should only use the modern style.  */
     { REMOTE_PROC_NETWORK_EVENT_LIFECYCLE,
       remoteNetworkBuildEventLifecycle,
       sizeof(remote_network_event_lifecycle_msg),
       (xdrproc_t)xdr_remote_network_event_lifecycle_msg },
+    { REMOTE_PROC_DOMAIN_EVENT_CALLBACK_LIFECYCLE,
+      remoteDomainBuildEventCallbackLifecycle,
+      sizeof(remote_domain_event_callback_lifecycle_msg),
+      (xdrproc_t)xdr_remote_domain_event_callback_lifecycle_msg },
 };

 enum virDrvOpenRemoteFlags {
@@ -4452,16 +4470,38 @@ remoteConnectDomainEventRegister(virConnectPtr conn,
                                                    VIR_DOMAIN_EVENT_ID_LIFECYCLE,
                                                    VIR_DOMAIN_EVENT_CALLBACK(callback),
                                                    opaque, freecb, true,
-                                                   &callbackID, false)) < 0)
+                                                   &callbackID,
+                                                   priv->serverEventFilter)) < 0)
          goto done;

     if (count == 1) {
         /* Tell the server when we are the first callback registering */
-        if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_REGISTER,
-                 (xdrproc_t) xdr_void, (char *) NULL,
-                 (xdrproc_t) xdr_void, (char *) NULL) == -1) {
-            virDomainEventStateDeregister(conn, priv->eventState, callback);
-            goto done;
+        if (priv->serverEventFilter) {
+            remote_connect_domain_event_callback_register_any_args args;
+            remote_connect_domain_event_callback_register_any_ret ret;
+
+            args.eventID = VIR_DOMAIN_EVENT_ID_LIFECYCLE;
+            args.dom = NULL;
+
+            memset(&ret, 0, sizeof(ret));
+            if (call(conn, priv, 0,
+                     REMOTE_PROC_CONNECT_DOMAIN_EVENT_CALLBACK_REGISTER_ANY,
+                     (xdrproc_t) xdr_remote_connect_domain_event_callback_register_any_args, (char *) &args,
+                     (xdrproc_t) xdr_remote_connect_domain_event_callback_register_any_ret, (char *) &ret) == -1) {
+                virObjectEventStateDeregisterID(conn, priv->eventState,
+                                                callbackID);
+                goto done;
+            }
+            virObjectEventStateSetRemote(conn, priv->eventState, callbackID,
+                                         ret.callbackID);
+        } else {
+            if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_REGISTER,
+                     (xdrproc_t) xdr_void, (char *) NULL,
+                     (xdrproc_t) xdr_void, (char *) NULL) == -1) {
+                virObjectEventStateDeregisterID(conn, priv->eventState,
+                                                callbackID);
+                goto done;
+            }
         }
     }

@@ -4472,26 +4512,45 @@ done:
     return rv;
 }

+
 static int
 remoteConnectDomainEventDeregister(virConnectPtr conn,
                                    virConnectDomainEventCallback callback)
 {
     struct private_data *priv = conn->privateData;
     int rv = -1;
+    remote_connect_domain_event_callback_deregister_any_args args;
+    int callbackID;
+    int remoteID;
     int count;

     remoteDriverLock(priv);

-    if ((count = virDomainEventStateDeregister(conn, priv->eventState,
-                                               callback)) < 0)
+    if ((callbackID = virDomainEventStateCallbackID(conn, priv->eventState,
+                                                    callback,
+                                                    &remoteID)) < 0)
+        goto done;
+
+    if ((count = virObjectEventStateDeregisterID(conn, priv->eventState,
+                                                 callbackID)) < 0)
         goto done;

     if (count == 0) {
         /* Tell the server when we are the last callback deregistering */
-        if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_DEREGISTER,
-                 (xdrproc_t) xdr_void, (char *) NULL,
-                 (xdrproc_t) xdr_void, (char *) NULL) == -1)
-            goto done;
+        if (priv->serverEventFilter) {
+            args.callbackID = remoteID;
+
+            if (call(conn, priv, 0,
+                     REMOTE_PROC_CONNECT_DOMAIN_EVENT_CALLBACK_DEREGISTER_ANY,
+                     (xdrproc_t) xdr_remote_connect_domain_event_callback_deregister_any_args, (char *) &args,
+                     (xdrproc_t) xdr_void, (char *) NULL) == -1)
+                goto done;
+        } else {
+            if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_DEREGISTER,
+                     (xdrproc_t) xdr_void, (char *) NULL,
+                     (xdrproc_t) xdr_void, (char *) NULL) == -1)
+                goto done;
+        }
     }

     rv = 0;
@@ -4512,13 +4571,11 @@ remoteEventQueue(struct private_data *priv, virObjectEventPtr event,


 static void
-remoteDomainBuildEventLifecycle(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
-                                virNetClientPtr client ATTRIBUTE_UNUSED,
-                                void *evdata, void *opaque)
+remoteDomainBuildEventLifecycleHelper(virConnectPtr conn,
+                                      remote_domain_event_lifecycle_msg *msg,
+                                      int callbackID)
 {
-    virConnectPtr conn = opaque;
     struct private_data *priv = conn->privateData;
-    remote_domain_event_lifecycle_msg *msg = evdata;
     virDomainPtr dom;
     virObjectEventPtr event = NULL;

@@ -4529,7 +4586,25 @@ remoteDomainBuildEventLifecycle(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
     event = virDomainEventLifecycleNewFromDom(dom, msg->event, msg->detail);
     virDomainFree(dom);

-    remoteEventQueue(priv, event, -1);
+    remoteEventQueue(priv, event, callbackID);
+}
+static void
+remoteDomainBuildEventLifecycle(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
+                                virNetClientPtr client ATTRIBUTE_UNUSED,
+                                void *evdata, void *opaque)
+{
+    virConnectPtr conn = opaque;
+    remote_domain_event_lifecycle_msg *msg = evdata;
+    remoteDomainBuildEventLifecycleHelper(conn, msg, -1);
+}
+static void
+remoteDomainBuildEventCallbackLifecycle(virNetClientProgramPtr prog ATTRIBUTE_UNUSED,
+                                        virNetClientPtr client ATTRIBUTE_UNUSED,
+                                        void *evdata, void *opaque)
+{
+    virConnectPtr conn = opaque;
+    remote_domain_event_callback_lifecycle_msg *msg = evdata;
+    remoteDomainBuildEventLifecycleHelper(conn, &msg->msg, msg->callbackID);
 }


@@ -5263,29 +5338,61 @@ remoteConnectDomainEventRegisterAny(virConnectPtr conn,
 {
     int rv = -1;
     struct private_data *priv = conn->privateData;
-    remote_connect_domain_event_register_any_args args;
     int callbackID;
     int count;
+    remote_nonnull_domain domain;
+    bool serverFilter;

     remoteDriverLock(priv);

+    serverFilter = priv->serverEventFilter;
+    /* FIXME support more than just lifecycle events */
+    serverFilter &= eventID == VIR_DOMAIN_EVENT_ID_LIFECYCLE;
+
     if ((count = virDomainEventStateRegisterClient(conn, priv->eventState,
                                                    dom, eventID, callback,
                                                    opaque, freecb, false,
-                                                   &callbackID, false)) < 0)
+                                                   &callbackID,
+                                                   serverFilter)) < 0)
         goto done;

     /* If this is the first callback for this eventID, we need to enable
      * events on the server */
     if (count == 1) {
-        args.eventID = eventID;
+        if (serverFilter) {
+            remote_connect_domain_event_callback_register_any_args args;
+            remote_connect_domain_event_callback_register_any_ret ret;
+
+            args.eventID = eventID;
+            if (dom) {
+                make_nonnull_domain(&domain, dom);
+                args.dom = &domain;
+            } else {
+                args.dom = NULL;
+            }

-        if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_REGISTER_ANY,
-                 (xdrproc_t) xdr_remote_connect_domain_event_register_any_args, (char *) &args,
-                 (xdrproc_t) xdr_void, (char *)NULL) == -1) {
-            virObjectEventStateDeregisterID(conn, priv->eventState,
-                                            callbackID);
-            goto done;
+            memset(&ret, 0, sizeof(ret));
+            if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_CALLBACK_REGISTER_ANY,
+                     (xdrproc_t) xdr_remote_connect_domain_event_callback_register_any_args, (char *) &args,
+                     (xdrproc_t) xdr_remote_connect_domain_event_callback_register_any_ret, (char *) &ret) == -1) {
+                virObjectEventStateDeregisterID(conn, priv->eventState,
+                                                callbackID);
+                goto done;
+            }
+            virObjectEventStateSetRemote(conn, priv->eventState, callbackID,
+                                         ret.callbackID);
+        } else {
+            remote_connect_domain_event_register_any_args args;
+
+            args.eventID = eventID;
+
+            if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_REGISTER_ANY,
+                     (xdrproc_t) xdr_remote_connect_domain_event_register_any_args, (char *) &args,
+                     (xdrproc_t) xdr_void, (char *)NULL) == -1) {
+                virObjectEventStateDeregisterID(conn, priv->eventState,
+                                                callbackID);
+                goto done;
+            }
         }
     }

@@ -5303,14 +5410,14 @@ remoteConnectDomainEventDeregisterAny(virConnectPtr conn,
 {
     struct private_data *priv = conn->privateData;
     int rv = -1;
-    remote_connect_domain_event_deregister_any_args args;
     int eventID;
+    int remoteID;
     int count;

     remoteDriverLock(priv);

     if ((eventID = virObjectEventStateEventID(conn, priv->eventState,
-                                              callbackID, NULL)) < 0)
+                                              callbackID, &remoteID)) < 0)
         goto done;

     if ((count = virObjectEventStateDeregisterID(conn, priv->eventState,
@@ -5319,13 +5426,29 @@ remoteConnectDomainEventDeregisterAny(virConnectPtr conn,

     /* If that was the last callback for this eventID, we need to disable
      * events on the server */
+    /* FIXME support more than just lifecycle events */
     if (count == 0) {
-        args.eventID = eventID;
+        if (priv->serverEventFilter &&
+            eventID == VIR_DOMAIN_EVENT_ID_LIFECYCLE) {
+            remote_connect_domain_event_callback_deregister_any_args args;

-        if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_DEREGISTER_ANY,
-                 (xdrproc_t) xdr_remote_connect_domain_event_deregister_any_args, (char *) &args,
-                 (xdrproc_t) xdr_void, (char *) NULL) == -1)
-            goto done;
+            args.callbackID = remoteID;
+
+            if (call(conn, priv, 0,
+                     REMOTE_PROC_CONNECT_DOMAIN_EVENT_CALLBACK_DEREGISTER_ANY,
+                     (xdrproc_t) xdr_remote_connect_domain_event_callback_deregister_any_args, (char *) &args,
+                     (xdrproc_t) xdr_void, (char *) NULL) == -1)
+                goto done;
+        } else {
+            remote_connect_domain_event_deregister_any_args args;
+
+            args.eventID = eventID;
+
+            if (call(conn, priv, 0, REMOTE_PROC_CONNECT_DOMAIN_EVENT_DEREGISTER_ANY,
+                     (xdrproc_t) xdr_remote_connect_domain_event_deregister_any_args, (char *) &args,
+                     (xdrproc_t) xdr_void, (char *) NULL) == -1)
+                goto done;
+        }
     }

     rv = 0;
-- 
1.8.5.3


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