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Refactor RPC client private data setup 

Currently there is a hook function that is invoked when a
new client connection comes in, which allows an app to
setup private data. This setup will make it difficult to
serialize client state during process re-exec(). Change to
a model where the app registers a callback when creating
the virNetServerPtr instance, which is used to allocate
the client private data immediately during virNetClientPtr
construction.

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange 2012-08-09 12:31:34 +01:00
parent 07143d84ba
commit 39b5e4d4d8
9 changed files with 63 additions and 60 deletions
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1
daemon/libvirtd.c
View File

@ -1196,6 +1196,7 @@ int main(int argc, char **argv) {
!!config->keepalive_required,
config->mdns_adv ? config->mdns_name : NULL,
remoteClientInitHook,
remoteClientFreeFunc,
NULL))) {
ret = VIR_DAEMON_ERR_INIT;
goto cleanup;

13
daemon/remote.c
View File

@ -631,7 +631,7 @@ verify(ARRAY_CARDINALITY(domainEventCallbacks) == VIR_DOMAIN_EVENT_ID_LAST);
* We keep the libvirt connection open until any async
* jobs have finished, then clean it up elsewhere
*/
static void remoteClientFreeFunc(void *data)
void remoteClientFreeFunc(void *data)
{
struct daemonClientPrivate *priv = data;
@ -663,8 +663,7 @@ static void remoteClientCloseFunc(virNetServerClientPtr client)
}
int remoteClientInitHook(virNetServerPtr srv ATTRIBUTE_UNUSED,
virNetServerClientPtr client,
void *remoteClientInitHook(virNetServerClientPtr client,
void *opaque ATTRIBUTE_UNUSED)
{
struct daemonClientPrivate *priv;
@ -672,22 +671,20 @@ int remoteClientInitHook(virNetServerPtr srv ATTRIBUTE_UNUSED,
if (VIR_ALLOC(priv) < 0) {
virReportOOMError();
return -1;
return NULL;
}
if (virMutexInit(&priv->lock) < 0) {
VIR_FREE(priv);
virReportOOMError();
return -1;
return NULL;
}
for (i = 0 ; i < VIR_DOMAIN_EVENT_ID_LAST ; i++)
priv->domainEventCallbackID[i] = -1;
virNetServerClientSetPrivateData(client, priv,
remoteClientFreeFunc);
virNetServerClientSetCloseHook(client, remoteClientCloseFunc);
return 0;
return priv;
}
/*----- Functions. -----*/

4
daemon/remote.h
View File

@ -35,8 +35,8 @@ extern size_t remoteNProcs;
extern virNetServerProgramProc qemuProcs[];
extern size_t qemuNProcs;
int remoteClientInitHook(virNetServerPtr srv,
virNetServerClientPtr client,
void remoteClientFreeFunc(void *data);
void *remoteClientInitHook(virNetServerClientPtr client,
void *opaque);
#endif /* __LIBVIRTD_REMOTE_H__ */

1
src/libvirt_private.syms
View File

@ -1524,7 +1524,6 @@ virNetServerClientSendMessage;
virNetServerClientSetCloseHook;
virNetServerClientSetDispatcher;
virNetServerClientSetIdentity;
virNetServerClientSetPrivateData;
virNetServerClientStartKeepAlive;
virNetServerClientWantClose;

21
src/lxc/lxc_controller.c
View File

@ -578,16 +578,26 @@ static void virLXCControllerClientCloseHook(virNetServerClientPtr client)
}
}
static int virLXCControllerClientHook(virNetServerPtr server ATTRIBUTE_UNUSED,
virNetServerClientPtr client,
static void virLXCControllerClientPrivateFree(void *data)
{
VIR_FREE(data);
}
static void *virLXCControllerClientPrivateNew(virNetServerClientPtr client,
void *opaque)
{
virLXCControllerPtr ctrl = opaque;
virNetServerClientSetPrivateData(client, ctrl, NULL);
int *dummy;
if (VIR_ALLOC(dummy) < 0) {
virReportOOMError();
return NULL;
}
virNetServerClientSetCloseHook(client, virLXCControllerClientCloseHook);
VIR_DEBUG("Got new client %p", client);
ctrl->client = client;
return 0;
return dummy;
}
@ -605,7 +615,8 @@ static int virLXCControllerSetupServer(virLXCControllerPtr ctrl)
if (!(ctrl->server = virNetServerNew(0, 0, 0, 1,
-1, 0, false,
NULL,
virLXCControllerClientHook,
virLXCControllerClientPrivateNew,
virLXCControllerClientPrivateFree,
ctrl)))
goto error;

24
src/rpc/virnetserver.c
View File

@ -104,8 +104,9 @@ struct _virNetServer {
virNetServerAutoShutdownFunc autoShutdownFunc;
void *autoShutdownOpaque;
virNetServerClientInitHook clientInitHook;
void *clientInitOpaque;
virNetServerClientPrivNew clientPrivNew;
virFreeCallback clientPrivFree;
void *clientPrivOpaque;
};
@ -281,16 +282,15 @@ static int virNetServerDispatchNewClient(virNetServerServicePtr svc,
virNetServerServiceGetAuth(svc),
virNetServerServiceIsReadonly(svc),
virNetServerServiceGetMaxRequests(svc),
virNetServerServiceGetTLSContext(svc))))
virNetServerServiceGetTLSContext(svc),
srv->clientPrivNew,
srv->clientPrivFree,
srv->clientPrivOpaque)))
goto error;
if (virNetServerClientInit(client) < 0)
goto error;
if (srv->clientInitHook &&
srv->clientInitHook(srv, client, srv->clientInitOpaque) < 0)
goto error;
if (VIR_EXPAND_N(srv->clients, srv->nclients, 1) < 0) {
virReportOOMError();
goto error;
@ -352,8 +352,9 @@ virNetServerPtr virNetServerNew(size_t min_workers,
unsigned int keepaliveCount,
bool keepaliveRequired,
const char *mdnsGroupName,
virNetServerClientInitHook clientInitHook,
void *opaque)
virNetServerClientPrivNew clientPrivNew,
virFreeCallback clientPrivFree,
void *clientPrivOpaque)
{
virNetServerPtr srv;
struct sigaction sig_action;
@ -376,8 +377,9 @@ virNetServerPtr virNetServerNew(size_t min_workers,
srv->keepaliveCount = keepaliveCount;
srv->keepaliveRequired = keepaliveRequired;
srv->sigwrite = srv->sigread = -1;
srv->clientInitHook = clientInitHook;
srv->clientInitOpaque = opaque;
srv->clientPrivNew = clientPrivNew;
srv->clientPrivFree = clientPrivFree;
srv->clientPrivOpaque = clientPrivOpaque;
srv->privileged = geteuid() == 0 ? true : false;
if (mdnsGroupName &&

9
src/rpc/virnetserver.h
View File

@ -32,10 +32,6 @@
# include "virnetserverservice.h"
# include "virobject.h"
typedef int (*virNetServerClientInitHook)(virNetServerPtr srv,
virNetServerClientPtr client,
void *opaque);
virNetServerPtr virNetServerNew(size_t min_workers,
size_t max_workers,
size_t priority_workers,
@ -44,8 +40,9 @@ virNetServerPtr virNetServerNew(size_t min_workers,
unsigned int keepaliveCount,
bool keepaliveRequired,
const char *mdnsGroupName,
virNetServerClientInitHook clientInitHook,
void *opaque);
virNetServerClientPrivNew clientPrivNew,
virFreeCallback clientPrivFree,
void *clientPrivOpaque);
typedef int (*virNetServerAutoShutdownFunc)(virNetServerPtr srv, void *opaque);

31
src/rpc/virnetserverclient.c
View File

@ -97,7 +97,7 @@ struct _virNetServerClient
void *dispatchOpaque;
void *privateData;
virNetServerClientFreeFunc privateDataFreeFunc;
virFreeCallback privateDataFreeFunc;
virNetServerClientCloseFunc privateDataCloseFunc;
virKeepAlivePtr keepalive;
@ -340,7 +340,10 @@ virNetServerClientPtr virNetServerClientNew(virNetSocketPtr sock,
int auth,
bool readonly,
size_t nrequests_max,
virNetTLSContextPtr tls)
virNetTLSContextPtr tls,
virNetServerClientPrivNew privNew,
virFreeCallback privFree,
void *privOpaque)
{
virNetServerClientPtr client;
@ -378,6 +381,14 @@ virNetServerClientPtr virNetServerClientNew(virNetSocketPtr sock,
}
client->nrequests = 1;
if (privNew) {
if (!(client->privateData = privNew(client, privOpaque))) {
virObjectUnref(client);
goto error;
}
client->privateDataFreeFunc = privFree;
}
PROBE(RPC_SERVER_CLIENT_NEW,
"client=%p sock=%p",
client, client->sock);
@ -507,22 +518,6 @@ const char *virNetServerClientGetIdentity(virNetServerClientPtr client)
return identity;
}
void virNetServerClientSetPrivateData(virNetServerClientPtr client,
void *opaque,
virNetServerClientFreeFunc ff)
{
virNetServerClientLock(client);
if (client->privateData &&
client->privateDataFreeFunc)
client->privateDataFreeFunc(client->privateData);
client->privateData = opaque;
client->privateDataFreeFunc = ff;
virNetServerClientUnlock(client);
}
void *virNetServerClientGetPrivateData(virNetServerClientPtr client)
{

13
src/rpc/virnetserverclient.h
View File

@ -39,11 +39,17 @@ typedef int (*virNetServerClientFilterFunc)(virNetServerClientPtr client,
virNetMessagePtr msg,
void *opaque);
typedef void *(*virNetServerClientPrivNew)(virNetServerClientPtr client,
void *opaque);
virNetServerClientPtr virNetServerClientNew(virNetSocketPtr sock,
int auth,
bool readonly,
size_t nrequests_max,
virNetTLSContextPtr tls);
virNetTLSContextPtr tls,
virNetServerClientPrivNew privNew,
virFreeCallback privFree,
void *privOpaque);
int virNetServerClientAddFilter(virNetServerClientPtr client,
virNetServerClientFilterFunc func,
@ -74,11 +80,6 @@ const char *virNetServerClientGetIdentity(virNetServerClientPtr client);
int virNetServerClientGetUNIXIdentity(virNetServerClientPtr client,
uid_t *uid, gid_t *gid, pid_t *pid);
typedef void (*virNetServerClientFreeFunc)(void *data);
void virNetServerClientSetPrivateData(virNetServerClientPtr client,
void *opaque,
virNetServerClientFreeFunc ff);
void *virNetServerClientGetPrivateData(virNetServerClientPtr client);
typedef void (*virNetServerClientCloseFunc)(virNetServerClientPtr client);