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[Cluster-devel] [PATCH 1/5] rgmanager: DBus notifications for service state changes



Clean cherry-pick in to RHEL6 branch

Resolves: rhbz#657756

Signed-off-by: Lon Hohberger <lhh redhat com>
---
 rgmanager/include/rg_dbus.h         |   14 ++++
 rgmanager/man/rgmanager.8           |    2 +
 rgmanager/src/daemons/Makefile      |    7 +-
 rgmanager/src/daemons/main.c        |   88 ++++++++++++++++++++-
 rgmanager/src/daemons/update-dbus.c |  144 +++++++++++++++++++++++++++++++++++
 5 files changed, 250 insertions(+), 5 deletions(-)
 create mode 100644 rgmanager/include/rg_dbus.h
 create mode 100644 rgmanager/src/daemons/update-dbus.c

diff --git a/rgmanager/include/rg_dbus.h b/rgmanager/include/rg_dbus.h
new file mode 100644
index 0000000..6454f29
--- /dev/null
+++ b/rgmanager/include/rg_dbus.h
@@ -0,0 +1,14 @@
+#ifdef DBUS
+#ifndef _RGM_DBUS_H
+#define _RGM_DBUS_H
+
+int rgm_dbus_init(void);
+int rgm_dbus_release(void);
+int rgm_dbus_notify(const char *svcname,
+    		    const char *svcstatus,
+    		    const char *svcflags,
+    		    const char *svcowner,
+    		    const char *svclast);
+
+#endif
+#endif
diff --git a/rgmanager/man/rgmanager.8 b/rgmanager/man/rgmanager.8
index 39b2195..a4e2c73 100644
--- a/rgmanager/man/rgmanager.8
+++ b/rgmanager/man/rgmanager.8
@@ -371,6 +371,8 @@ will leave the virtual machine running.
 Run in the foreground (do not fork).
 .IP \-d
 Enable debug-level logging.
+.IP \-D
+Disable DBus signals which are normally sent when services change state.
 .IP \-w
 Disable internal process monitoring (for debugging).
 .IP \-N
diff --git a/rgmanager/src/daemons/Makefile b/rgmanager/src/daemons/Makefile
index 94e0dbb..4dbbe5a 100644
--- a/rgmanager/src/daemons/Makefile
+++ b/rgmanager/src/daemons/Makefile
@@ -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
diff --git a/rgmanager/src/daemons/main.c b/rgmanager/src/daemons/main.c
index 4e34246..303e0c0 100644
--- a/rgmanager/src/daemons/main.c
+++ b/rgmanager/src/daemons/main.c
@@ -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 *);
@@ -42,7 +43,9 @@ static int signalled = 0;
 static uint8_t ALIGNED port = RG_PORT;
 static char *rgmanager_lsname = (char *)"rgmanager"; /* XXX default */
 static int status_poll_interval = DEFAULT_CHECK_INTERVAL;
-
+#ifdef DBUS
+static int state_notify = 1;
+#endif
 
 static void
 segfault(int __attribute__ ((unused)) sig)
@@ -935,6 +938,68 @@ shutdown_thread(void __attribute__ ((unused)) *arg)
 }
 
 
+#ifdef DBUS
+static int32_t
+svc_update(char *key, uint64_t view, void *data, uint32_t size)
+{
+	char flags[64];
+	rg_state_t *st;
+	cluster_member_list_t *m;
+	const char *owner;
+	const char *last;
+	int ret = 0;
+
+	if (!state_notify)
+		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)";
+
+	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; "
+			   "notifications disabled\n", key);
+		rgm_dbus_release();
+		state_notify = 0;
+	}
+
+out_free:
+	if (m)
+		free_member_list(m);
+	free(data);
+	return 0;
+}
+#endif
+
+
 #ifdef WRAP_THREADS
 void dump_thread_states(FILE *);
 #endif
@@ -949,7 +1014,7 @@ 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, "wfdND")) != EOF) {
 		switch (rv) {
 		case 'w':
 			wd = 0;
@@ -963,6 +1028,11 @@ main(int argc, char **argv)
 		case 'f':
 			foreground = 1;
 			break;
+		case 'D':
+#ifdef DBUS
+			state_notify = 0;
+#endif
+			break;
 		default:
 			return 1;
 			break;
@@ -1032,6 +1102,11 @@ main(int argc, char **argv)
 	configure_rgmanager(-1, debug, &cluster_timeout);
 	logt_print(LOG_NOTICE, "Resource Group Manager Starting\n");
 
+#ifdef DBUS
+	if (state_notify && rgm_dbus_init() != 0) 
+		logt_print(LOG_NOTICE, "Failed to initialize DBus\n");
+#endif
+
 	if (init_resource_groups(0, do_init) != 0) {
 		logt_print(LOG_CRIT, "#8: Couldn't initialize services\n");
 		goto out_ls;
@@ -1074,7 +1149,11 @@ 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, 
+#ifdef DBUS /* Ugly */
+		    state_notify ? svc_update :
+#endif
+		    NULL, cluster_timeout) != 0) {
 		logt_print(LOG_CRIT, "#11: Couldn't set up VF listen socket\n");
 		goto out_ls;
 	}
@@ -1106,6 +1185,9 @@ out_ls:
 	clu_lock_finished(rgmanager_lsname);
 
 out:
+#ifdef DBUS
+	rgm_dbus_release();
+#endif
 	logt_print(LOG_NOTICE, "Shutdown complete, exiting\n");
 	cman_finish(clu);
 	
diff --git a/rgmanager/src/daemons/update-dbus.c b/rgmanager/src/daemons/update-dbus.c
new file mode 100644
index 0000000..9e3078d
--- /dev/null
+++ b/rgmanager/src/daemons/update-dbus.c
@@ -0,0 +1,144 @@
+/* DBus notifications */
+#include <stdio.h>
+#include <stdint.h>
+#include <resgroup.h>
+#include <poll.h>
+#include <dbus/dbus.h>
+#include <rg_dbus.h>
+#ifdef DBUS
+
+#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;
+static char _err[512];
+static int err_set = 0;
+
+int 
+rgm_dbus_init(void)
+{
+	DBusConnection *dbc = NULL;
+	DBusError err;
+
+	dbus_error_init(&err);
+
+	dbc = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
+	if (!dbc) {
+		snprintf(_err, sizeof(_err),
+			 "dbus_bus_get: %s", err.message);
+		err_set = 1;
+		dbus_error_free(&err);
+		return -1;
+	}
+
+	dbus_connection_set_exit_on_disconnect(dbc, FALSE);
+
+	db = dbc;
+	return 0;
+}
+
+
+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 (th) {
+		t = th;
+		th = 0;
+		pthread_join(t, NULL);
+	}
+
+	dbus_connection_unref(db);
+	db = NULL;
+
+	return 0;
+}
+
+
+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;
+}
+
+
+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 (err_set) {
+		fprintf(stderr, "%s\n", _err);
+		err_set = 0;
+	}
+
+	if (!db) {
+		goto out_free;
+	}
+
+	pthread_mutex_lock(&mu);
+
+	if (dbus_connection_get_is_connected(db) != TRUE) {
+		err_set = 1;
+		snprintf(_err, sizeof(_err), "DBus connection lost");
+		rgm_dbus_release();
+		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;
+}
+#endif
-- 
1.7.2.3


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