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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Stephen Gallagher <sgallagh@redhat.com>
Simo Sorce <ssorce@redhat.com>
Copyright (C) 2017 Red Hat
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <tevent.h>
#include <talloc.h>
#include <dbus/dbus.h>
#include "util/util.h"
#include "util/dlinklist.h"
#include "sbus/sbus_private.h"
static void
sbus_dispatch_schedule(struct sbus_connection *conn, uint32_t usecs);
static void
sbus_dispatch_reconnect(struct sbus_connection *conn)
{
/* Terminate all outgoing requests associated with this connection. */
DEBUG(SSSDBG_TRACE_FUNC, "Connection lost. Terminating active requests.\n");
sbus_requests_terminate_all(conn->requests->outgoing, ERR_TERMINATED);
switch (conn->type) {
case SBUS_CONNECTION_CLIENT:
/* Remote client closed the connection. We can't reestablish
* connection with a client, it must reconnect to us if it
* needs to. Therefore we are done here. */
DEBUG(SSSDBG_TRACE_ALL, "Remote client terminated the connection. "
"Releasing data...\n");
sbus_connection_free(conn);
break;
case SBUS_CONNECTION_ADDRESS:
case SBUS_CONNECTION_SYSBUS:
/* Try to reconnect if it was enabled. */
if (sbus_reconnect_enabled(conn)) {
sbus_reconnect(conn);
return;
}
/* We were unable to reconnect. There is nothing we can do. */
DEBUG(SSSDBG_MINOR_FAILURE, "Connection is not open for "
"dispatching. Releasing data...\n");
sbus_connection_free(conn);
break;
}
}
static void
sbus_dispatch(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval tv,
void *data)
{
DBusDispatchStatus status;
struct sbus_connection *conn;
bool connected;
conn = talloc_get_type(data, struct sbus_connection);
/* Just return if the connection is being terminated. */
if (conn->disconnecting) {
return;
}
/* Defer dispatch if we reconnecting. */
if (sbus_reconnect_in_progress(conn)) {
DEBUG(SSSDBG_TRACE_FUNC, "SBUS is reconnecting. Deferring.\n");
sbus_dispatch_schedule(conn, 30);
return;
}
/* Try to reconnect if we are not connected. */
connected = dbus_connection_get_is_connected(conn->connection);
if (!connected) {
sbus_dispatch_reconnect(conn);
return;
}
/* Dispatch only once to avoid starving other tevent requests. */
status = dbus_connection_get_dispatch_status(conn->connection);
if (status != DBUS_DISPATCH_COMPLETE) {
DEBUG(SSSDBG_TRACE_ALL, "Dispatching.\n");
dbus_connection_dispatch(conn->connection);
}
/* If other dispatches are waiting, schedule next dispatch. */
status = dbus_connection_get_dispatch_status(conn->connection);
if (status != DBUS_DISPATCH_COMPLETE) {
sbus_dispatch_schedule(conn, 0);
}
}
static void
sbus_dispatch_schedule(struct sbus_connection *conn, uint32_t usecs)
{
struct tevent_timer *te;
struct timeval tv;
tv = tevent_timeval_current_ofs(0, usecs);
te = tevent_add_timer(conn->ev, conn, tv, sbus_dispatch, conn);
if (te == NULL) {
/* There is not enough memory to create a timer. We can't do
* anything about it. */
DEBUG(SSSDBG_OP_FAILURE, "Could not add dispatch event!\n");
}
}
/**
* This is called each time when D-Bus has data to dispatch available.
* We create a timed event to avoid tevent request starving.
*/
static void
sbus_dispatch_wakeup(void *data)
{
struct sbus_connection *conn;
conn = talloc_get_type(data, struct sbus_connection);
sbus_dispatch_schedule(conn, 0);
}
void sbus_dispatcher_setup(struct sbus_connection *conn)
{
dbus_connection_set_wakeup_main_function(conn->connection,
sbus_dispatch_wakeup,
conn, NULL);
}
void sbus_dispatcher_disable(struct sbus_connection *conn)
{
dbus_connection_set_wakeup_main_function(conn->connection,
NULL, NULL, NULL);
}
void sbus_dispatch_now(struct sbus_connection *conn)
{
sbus_dispatch_wakeup(conn);
}
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