rgmanager: dbus notifications (Merged)

Includes aforementioned makefile fix

Everything in one patch for easy reading.

Resolves: rhbz#657756

Signed-off-by Lon Hohberger <[email protected]>

---
 rgmanager/include/rg_dbus.h         |   20 +++
 rgmanager/man/rgmanager.8           |    2 +
 rgmanager/src/daemons/Makefile      |    7 +-
 rgmanager/src/daemons/main.c        |   19 ++-
 rgmanager/src/daemons/update-dbus.c |  266 +++++++++++++++++++++++++++++++++++
 5 files changed, 309 insertions(+), 5 deletions(-)
 create mode 100644 rgmanager/include/rg_dbus.h
 create mode 100644 rgmanager/src/daemons/update-dbus.c

rgmanager/include/rg_dbus.h new file +20 -0

new file mode 100644
index 0000000..3ef5ae1
@@ -0,0 +1,20 @@
+#ifndef _RGM_DBUS_H
+#define _RGM_DBUS_H
+
+int rgm_dbus_init(void);
+int rgm_dbus_release(void);
+extern int rgm_dbus_notify;
+
+#ifdef DBUS
+
+#define RGM_DBUS_DEFAULT 1
+#define RGM_DBUS_UPDATE (rgm_dbus_notify?rgm_dbus_update:0)
+int32_t rgm_dbus_update(char *key, uint64_t view, void *data, uint32_t size);
+
+#else
+
+#define RGM_DBUS_DEFAULT 0
+#define RGM_DBUS_UPDATE NULL
+
+#endif /* DBUS */
+#endif

rgmanager/man/rgmanager.8 +2 -0

index 39b2195..2b018d2 100644
@@ -371,6 +371,8 @@ will leave the virtual machine running.
 Run in the foreground (do not fork).
 .IP \-d
 Enable debug-level logging.
+.IP \-q
+Disable DBus signals which are normally sent when services change state.
 .IP \-w
 Disable internal process monitoring (for debugging).
 .IP \-N

rgmanager/src/daemons/Makefile +5 -2

index 94e0dbb..4dbbe5a 100644
@@ -29,6 +29,7 @@ OBJS1=	fo_domain.o \
 	service_op.o \
 	slang_event.o \
 	event_config.o \
+	update-dbus.o \
 	watchdog.o
 
 OBJS2=	test-noccs.o \

@@ -40,12 +41,13 @@ OBJS2=	test-noccs.o \
 	rg_locks-noccs.o \
 	event_config-noccs.o
 
-CFLAGS += -DSHAREDIR=\"${sharedir}\" -D_GNU_SOURCE
+CFLAGS += -DDBUS -DSHAREDIR=\"${sharedir}\" -D_GNU_SOURCE
 CFLAGS += -fPIC
 CFLAGS += -I${ccsincdir} -I${cmanincdir} -I${dlmincdir} -I${logtincdir}
 CFLAGS += `xml2-config --cflags` -I${slangincdir}
 CFLAGS += -I$(S)/../../include
 CFLAGS += -I${incdir}
+CFLAGS += `pkg-config --cflags dbus-1`
 
 NOCCS_CFLAGS += -DNO_CCS
 

@@ -59,6 +61,7 @@ DLM_LDFLAGS += -L${dlmlibdir} -ldlm
 XML2_LDFLAGS += `xml2-config --libs`
 SLANG_LDFLAGS += -L${slanglibdir} -lslang
 EXTRA_LDFLAGS += -lpthread
+DBUS_LDFLAGS += `pkg-config --libs dbus-1`
 
 LDDEPS += ../clulib/libclulib.a
 

@@ -66,7 +69,7 @@ ${TARGET1}: ${OBJS1} ${LDDEPS}
 	$(CC) -o $@ $^ $(CCS_LDFLAGS) $(CMAN_LDFLAGS) \
 			$(DLM_LDFLAGS) $(XML2_LDFLAGS) \
 			$(SLANG_LDFLAGS) $(EXTRA_LDFLAGS) \
-			$(LOGSYS_LDFLAGS) $(LD_FLAGS)
+			$(LOGSYS_LDFLAGS) $(LD_FLAGS) $(DBUS_LDFLAGS)
 
 #
 # Our test program links against the local allocator so that

rgmanager/src/daemons/main.c +16 -3

index 4e34246..02cd2dc 100644
@@ -23,6 +23,7 @@
 #include <members.h>
 #include <daemon_init.h>
 #include <groups.h>
+#include <rg_dbus.h>
 
 #ifdef WRAP_THREADS
 void dump_thread_states(FILE *);

@@ -43,7 +44,6 @@ static uint8_t ALIGNED port = RG_PORT;
 static char *rgmanager_lsname = (char *)"rgmanager"; /* XXX default */
 static int status_poll_interval = DEFAULT_CHECK_INTERVAL;
 
-
 static void
 segfault(int __attribute__ ((unused)) sig)
 {

@@ -684,6 +684,8 @@ event_loop(msgctx_t *localctx, msgctx_t *clusterctx)
 		dump_internal_state("/var/lib/cluster/rgmanager-dump");
 	}
 
+	rgm_dbus_init();
+
 	while (running && (tv.tv_sec || tv.tv_usec)) {
 		FD_ZERO(&rfds);
 		max = -1;

@@ -949,7 +951,7 @@ main(int argc, char **argv)
 	pthread_t th;
 	cman_handle_t clu = NULL;
 
-	while ((rv = getopt(argc, argv, "wfdN")) != EOF) {
+	while ((rv = getopt(argc, argv, "wfdNq")) != EOF) {
 		switch (rv) {
 		case 'w':
 			wd = 0;

@@ -963,6 +965,9 @@ main(int argc, char **argv)
 		case 'f':
 			foreground = 1;
 			break;
+		case 'q':
+			rgm_dbus_notify = 0;
+			break;
 		default:
 			return 1;
 			break;

@@ -1032,6 +1037,12 @@ main(int argc, char **argv)
 	configure_rgmanager(-1, debug, &cluster_timeout);
 	logt_print(LOG_NOTICE, "Resource Group Manager Starting\n");
 
+	if (rgm_dbus_notify && rgm_dbus_init() != 0) {
+		rgm_dbus_notify = 0;
+		logt_print(LOG_NOTICE, "Failed to initialize DBus; "
+			   "notifications disabled\n");
+	}
+
 	if (init_resource_groups(0, do_init) != 0) {
 		logt_print(LOG_CRIT, "#8: Couldn't initialize services\n");
 		goto out_ls;

@@ -1074,7 +1085,8 @@ main(int argc, char **argv)
 
 	ds_key_init("rg_lockdown", 32, 10);
 #else
-	if (vf_init(me.cn_nodeid, port, NULL, NULL, cluster_timeout) != 0) {
+	if (vf_init(me.cn_nodeid, port, NULL, RGM_DBUS_UPDATE,
+		    cluster_timeout) != 0) {
 		logt_print(LOG_CRIT, "#11: Couldn't set up VF listen socket\n");
 		goto out_ls;
 	}

@@ -1106,6 +1118,7 @@ out_ls:
 	clu_lock_finished(rgmanager_lsname);
 
 out:
+	rgm_dbus_release();
 	logt_print(LOG_NOTICE, "Shutdown complete, exiting\n");
 	cman_finish(clu);
 

rgmanager/src/daemons/update-dbus.c new file +266 -0

new file mode 100644
index 0000000..f465d1d
@@ -0,0 +1,266 @@
+/* DBus notifications */
+#include <stdint.h>
+#include <rg_dbus.h>
+#include <errno.h>
+
+#ifdef DBUS
+
+#include <stdio.h>
+#include <stdint.h>
+#include <resgroup.h>
+#include <poll.h>
+#include <dbus/dbus.h>
+#include <liblogthread.h>
+#include <members.h>
+
+
+#define DBUS_RGM_NAME	"com.redhat.cluster.rgmanager"
+#define DBUS_RGM_IFACE	"com.redhat.cluster.rgmanager"
+#define DBUS_RGM_PATH	"/com/redhat/cluster/rgmanager"
+
+static DBusConnection *db = NULL;
+static pthread_mutex_t mu = PTHREAD_MUTEX_INITIALIZER;
+static pthread_t th = 0;
+#endif
+
+/* Set this to the desired value prior to calling rgm_dbus_init() */
+int rgm_dbus_notify = RGM_DBUS_DEFAULT;
+
+
+int 
+rgm_dbus_init(void)
+#ifdef DBUS
+{
+	DBusConnection *dbc = NULL;
+	DBusError err;
+
+	if (!rgm_dbus_notify)
+		return 0;
+
+	pthread_mutex_lock(&mu);
+	if (db) {
+		pthread_mutex_unlock(&mu);
+		return 0;
+	}
+
+	dbus_error_init(&err);
+
+	dbc = dbus_bus_get_private(DBUS_BUS_SYSTEM, &err);
+	if (!dbc) {
+		logt_print(LOG_DEBUG,
+			   "DBus Failed to initialize: dbus_bus_get: %s\n",
+			   err.message);
+		dbus_error_free(&err);
+		pthread_mutex_unlock(&mu);
+		return -1;
+	}
+
+	dbus_connection_set_exit_on_disconnect(dbc, FALSE);
+
+	db = dbc;
+	pthread_mutex_unlock(&mu);
+	logt_print(LOG_DEBUG, "DBus Notifications Initialized\n");
+	return 0;
+}
+#else
+{
+	errno = ENOSYS;
+	return -1;
+}
+#endif
+
+
+#ifdef DBUS
+static int
+_rgm_dbus_release(void)
+{
+	pthread_t t;
+
+	if (!db)
+		return 0;
+
+	/* tell thread to exit - not sure how to tell dbus
+	 * to wake up, so just have it poll XXX */
+
+	/* if the thread left because the dbus connection died,
+	   this block is avoided */
+	if (th) {
+		t = th;
+		th = 0;
+		pthread_join(t, NULL);
+	}
+
+	dbus_connection_close(db);
+	dbus_connection_unref(db);
+	db = NULL;
+
+	logt_print(LOG_DEBUG, "DBus Released\n");
+	return 0;
+}
+#endif
+
+
+/* Clean shutdown (e.g. when exiting */
+int
+rgm_dbus_release(void)
+#ifdef DBUS
+{
+	int ret;
+
+	pthread_mutex_lock(&mu);
+	ret = _rgm_dbus_release();
+	pthread_mutex_unlock(&mu);
+	return ret;
+}
+#else
+{
+	return 0;
+}
+#endif
+
+
+#ifdef DBUS
+/* Auto-flush thread.  Since sending only guarantees queueing,
+ * we need this thread to push things out over dbus in the
+ * background */
+static void *
+_dbus_auto_flush(void *arg)
+{
+	/* DBus connection functions are thread safe */
+	dbus_connection_ref(db);
+	while (dbus_connection_read_write(db, 500)) {
+		if (!th)
+			break;	
+	}
+
+	dbus_connection_unref(db);
+	th = 0;
+	return NULL;
+}
+
+
+static int
+_rgm_dbus_notify(const char *svcname,
+		 const char *svcstatus,
+		 const char *svcflags,
+		 const char *svcowner,
+		 const char *svclast)
+{
+	DBusMessage *msg = NULL;
+	int ret = -1;
+
+	if (!db) {
+		goto out_free;
+	}
+
+	pthread_mutex_lock(&mu);
+
+	/* Check to ensure the connection is still valid. If it
+	 * isn't, clean up and shut down the dbus connection.
+	 *
+	 * The main rgmanager thread will periodically try to
+	 * reinitialize the dbus notification subsystem unless
+	 * the administrator ran rgmanager with the -D command
+	 * line option.
+	 */
+	if (dbus_connection_get_is_connected(db) != TRUE) {
+		goto out_unlock;
+	}
+
+	if (!th) {
+		/* start auto-flush thread if needed */
+		pthread_create(&th, NULL, _dbus_auto_flush, NULL);
+	}
+
+	if (!(msg = dbus_message_new_signal(DBUS_RGM_PATH,
+	      				    DBUS_RGM_IFACE,
+	      				    "ServiceStateChange"))) {
+		goto out_unlock;
+	}
+
+	if (!dbus_message_append_args(msg,
+	 			      DBUS_TYPE_STRING, &svcname,
+	 			      DBUS_TYPE_STRING, &svcstatus,
+	 			      DBUS_TYPE_STRING, &svcflags,
+ 				      DBUS_TYPE_STRING, &svcowner,
+ 				      DBUS_TYPE_STRING, &svclast,
+	    			      DBUS_TYPE_INVALID)) {
+		goto out_unlock;
+	}
+
+	dbus_connection_send(db, msg, NULL);
+	ret = 0;
+
+out_unlock:
+	pthread_mutex_unlock(&mu);
+	if (msg)
+		dbus_message_unref(msg);
+out_free:
+	return ret;
+}
+
+
+/*
+ * view-formation callback function
+ */
+int32_t
+rgm_dbus_update(char *key, uint64_t view, void *data, uint32_t size)
+{
+	char flags[64];
+	rg_state_t *st;
+	cluster_member_list_t *m = NULL;
+	const char *owner;
+	const char *last;
+	int ret = 0;
+
+	if (!rgm_dbus_notify)
+		goto out_free;
+	if (!db)
+		goto out_free;
+	if (view == 1)
+		goto out_free;
+	if (size != (sizeof(*st)))
+		goto out_free;
+
+	st = (rg_state_t *)data;
+	swab_rg_state_t(st);
+
+	/* Don't send transitional states */
+	if (st->rs_state == RG_STATE_STARTING ||
+	    st->rs_state == RG_STATE_STOPPING)
+		goto out_free;
+
+	m = member_list();
+	if (!m)
+		goto out_free;
+
+	owner = memb_id_to_name(m, st->rs_owner);
+	last = memb_id_to_name(m, st->rs_last_owner);
+
+	if (!owner)
+		owner = "(none)";
+	if (!last)
+		last = "(none)";
+
+	flags[0] = 0;
+	rg_flags_str(flags, sizeof(flags), st->rs_flags, (char *)" ");
+	if (flags[0] == 0)
+		snprintf(flags, sizeof(flags), "(none)");
+
+	ret = _rgm_dbus_notify(st->rs_name,
+			       rg_state_str(st->rs_state),
+			       (char *)flags, owner, last);
+
+	if (ret < 0) {
+		logt_print(LOG_ERR, "Error sending update for %s; "
+			   "DBus notifications disabled\n", key);
+		rgm_dbus_release();
+	}
+
+out_free:
+	if (m)
+		free_member_list(m);
+	free(data);
+	return 0;
+}
+#endif