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/*
* Copyright (c) 2019 One Identity
* Copyright (c) 2019 László Várady
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, 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, 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 "syslog-ng.h"
#include "poll-multiline-file-changes.h"
#include "messages.h"
#include <iv.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
typedef struct PollMultilineFileChanges
{
PollFileChanges super;
FileReader *file_reader;
gint multi_line_timeout;
gboolean timed_out;
gint64 last_eof;
} PollMultilineFileChanges;
static void
_flush_partial_message(PollMultilineFileChanges *self)
{
file_reader_cue_buffer_flush(self->file_reader);
/* invoke fetch */
poll_events_invoke_callback(&self->super.super);
}
static void
poll_multiline_file_changes_start_timer(PollMultilineFileChanges *self)
{
self->last_eof = g_get_monotonic_time();
}
static void
poll_multiline_file_changes_stop_timer(PollMultilineFileChanges *self)
{
self->last_eof = 0;
}
static void
poll_multiline_file_changes_timeout_expired(PollMultilineFileChanges *self)
{
msg_debug("Multi-line timeout has elapsed, processing partial message",
evt_tag_str("filename", self->super.follow_filename));
self->last_eof = 0;
self->timed_out = TRUE;
_flush_partial_message(self);
}
static gboolean
_is_multi_line_timeout_pending(PollMultilineFileChanges *self)
{
return self->last_eof != 0;
}
static gboolean
_is_multi_line_timeout_expired(PollMultilineFileChanges *self)
{
if (self->last_eof == 0)
return FALSE;
gint64 millisecs_since_last_eof = (g_get_monotonic_time() - self->last_eof) / 1000;
return millisecs_since_last_eof > self->multi_line_timeout;
}
static gboolean
poll_multiline_file_changes_on_eof(PollFileChanges *s)
{
PollMultilineFileChanges *self = (PollMultilineFileChanges *) s;
if (self->timed_out)
return TRUE;
if (!_is_multi_line_timeout_pending(self))
{
poll_multiline_file_changes_start_timer(self);
return TRUE;
}
if (_is_multi_line_timeout_expired(self))
{
poll_multiline_file_changes_timeout_expired(self);
return FALSE;
}
return TRUE;
}
static void
poll_multiline_file_changes_on_file_moved(PollFileChanges *s)
{
PollMultilineFileChanges *self = (PollMultilineFileChanges *) s;
poll_multiline_file_changes_stop_timer(self);
}
static void
poll_multiline_file_changes_on_read(PollFileChanges *s)
{
PollMultilineFileChanges *self = (PollMultilineFileChanges *) s;
poll_multiline_file_changes_stop_timer(self);
self->timed_out = FALSE;
}
static void
poll_multiline_file_changes_stop_watches(PollEvents *s)
{
PollMultilineFileChanges *self = (PollMultilineFileChanges *) s;
poll_multiline_file_changes_stop_timer(self);
poll_file_changes_stop_watches(s);
}
PollEvents *
poll_multiline_file_changes_new(gint fd, const gchar *follow_filename, gint follow_freq,
gint multi_line_timeout, FileReader *reader)
{
PollMultilineFileChanges *self = g_new0(PollMultilineFileChanges, 1);
poll_file_changes_init_instance(&self->super, fd, follow_filename, follow_freq, &reader->super);
self->multi_line_timeout = multi_line_timeout;
if (!self->multi_line_timeout)
return &self->super.super;
self->file_reader = reader;
self->super.on_read = poll_multiline_file_changes_on_read;
self->super.on_eof = poll_multiline_file_changes_on_eof;
self->super.on_file_moved = poll_multiline_file_changes_on_file_moved;
self->super.super.update_watches = poll_file_changes_update_watches;
self->super.super.stop_watches = poll_multiline_file_changes_stop_watches;
return &self->super.super;
}
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