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/*
* Copyright (c) 2002-2014 Balabit
* Copyright (c) 2014 Laszlo Budai
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "ack_tracker.h"
#include "bookmark.h"
#include "ringbuffer.h"
#include "syslog-ng.h"
typedef struct _LateAckRecord
{
AckRecord super;
gboolean acked;
Bookmark bookmark;
} LateAckRecord;
typedef struct LateAckTracker
{
AckTracker super;
LateAckRecord *pending_ack_record;
RingBuffer ack_record_storage;
GStaticMutex storage_mutex;
} LateAckTracker;
static inline void
late_ack_record_destroy(LateAckRecord *self)
{
if (self->bookmark.destroy)
self->bookmark.destroy(&(self->bookmark));
}
static inline void
_late_tracker_lock(LateAckTracker *self)
{
g_static_mutex_lock(&self->storage_mutex);
}
static inline void
_late_tracker_unlock(LateAckTracker *self)
{
g_static_mutex_unlock(&self->storage_mutex);
}
static inline gboolean
_ack_range_is_continuous(void *data)
{
LateAckRecord *ack_rec = (LateAckRecord *)data;
return ack_rec->acked;
}
static inline guint32
_get_continuous_range_length(LateAckTracker *self)
{
return ring_buffer_get_continual_range_length(&self->ack_record_storage, _ack_range_is_continuous);
}
static inline void
_drop_range(LateAckTracker *self, guint32 n)
{
int i;
LateAckRecord *ack_rec;
for (i = 0; i < n; i++)
{
ack_rec = ring_buffer_element_at(&self->ack_record_storage, i);
ack_rec->acked = FALSE;
late_ack_record_destroy(ack_rec);
ack_rec->bookmark.save = NULL;
ack_rec->bookmark.destroy = NULL;
}
ring_buffer_drop(&self->ack_record_storage, n);
}
static void
late_ack_tracker_track_msg(AckTracker *s, LogMessage *msg)
{
LateAckTracker *self = (LateAckTracker *)s;
LogSource *source = self->super.source;
g_assert(self->pending_ack_record != NULL);
log_pipe_ref((LogPipe *)source);
msg->ack_record = (AckRecord *)self->pending_ack_record;
_late_tracker_lock(self);
{
LateAckRecord *ack_rec;
ack_rec = (LateAckRecord *)ring_buffer_push(&self->ack_record_storage);
g_assert(ack_rec == self->pending_ack_record);
}
_late_tracker_unlock(self);
self->pending_ack_record = NULL;
}
static void
late_ack_tracker_manage_msg_ack(AckTracker *s, LogMessage *msg, AckType ack_type)
{
LateAckTracker *self = (LateAckTracker *)s;
LateAckRecord *ack_rec = (LateAckRecord *)msg->ack_record;
LateAckRecord *last_in_range = NULL;
guint32 ack_range_length = 0;
ack_rec->acked = TRUE;
_late_tracker_lock(self);
{
ack_range_length = _get_continuous_range_length(self);
if (ack_range_length > 0)
{
last_in_range = ring_buffer_element_at(&self->ack_record_storage, ack_range_length - 1);
if (ack_type != AT_ABORTED)
{
Bookmark *bookmark = &(last_in_range->bookmark);
bookmark->save(bookmark);
}
_drop_range(self, ack_range_length);
if (ack_type == AT_SUSPENDED)
log_source_flow_control_suspend(self->super.source);
else
log_source_flow_control_adjust(self->super.source, ack_range_length);
}
}
_late_tracker_unlock(self);
log_msg_unref(msg);
log_pipe_unref((LogPipe *)self->super.source);
}
static Bookmark *
late_ack_tracker_request_bookmark(AckTracker *s)
{
LateAckTracker *self = (LateAckTracker *)s;
_late_tracker_lock(self);
{
self->pending_ack_record = ring_buffer_tail(&self->ack_record_storage);
}
_late_tracker_unlock(self);
if (self->pending_ack_record)
{
self->pending_ack_record->bookmark.persist_state = s->source->super.cfg->state;
self->pending_ack_record->super.tracker = (AckTracker *)self;
return &(self->pending_ack_record->bookmark);
}
return NULL;
}
static void
late_ack_tracker_init_instance(LateAckTracker *self, LogSource *source)
{
self->super.late = TRUE;
self->super.source = source;
source->ack_tracker = (AckTracker *)self;
self->super.request_bookmark = late_ack_tracker_request_bookmark;
self->super.track_msg = late_ack_tracker_track_msg;
self->super.manage_msg_ack = late_ack_tracker_manage_msg_ack;
ring_buffer_alloc(&self->ack_record_storage, sizeof(LateAckRecord), log_source_get_init_window_size(source));
g_static_mutex_init(&self->storage_mutex);
}
AckTracker*
late_ack_tracker_new(LogSource *source)
{
LateAckTracker *self = g_new0(LateAckTracker, 1);
late_ack_tracker_init_instance(self, source);
return (AckTracker *)self;
}
void
late_ack_tracker_free(AckTracker *s)
{
LateAckTracker *self = (LateAckTracker *)s;
guint32 count = ring_buffer_count(&self->ack_record_storage);
g_static_mutex_free(&self->storage_mutex);
_drop_range(self, count);
ring_buffer_free(&self->ack_record_storage);
g_free(self);
}
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