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/*
* Copyright (c) 2013 Tihamer Petrovics <tihameri@gmail.com>
* Copyright (c) 2014 Pierre-Yves Ritschard <pyr@spootnik.org>
* Copyright (c) 2019 Balabit
* Copyright (c) 2019 Balazs Scheidler
*
* 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 "kafka-dest-worker.h"
#include "kafka-dest-driver.h"
#include "str-utils.h"
#include "timeutils/misc.h"
#include <zlib.h>
typedef struct _KafkaDestWorker
{
LogThreadedDestWorker super;
struct iv_timer poll_timer;
GString *key;
GString *message;
} KafkaDestWorker;
static gboolean
_is_poller_thread(KafkaDestWorker *self)
{
return (self->super.worker_index == 0);
}
static void
_format_message_and_key(KafkaDestWorker *self, LogMessage *msg)
{
KafkaDestDriver *owner = (KafkaDestDriver *) self->super.owner;
log_template_format(owner->message, msg, &owner->template_options, LTZ_SEND,
self->super.seq_num, NULL, self->message);
if (owner->key)
log_template_format(owner->key, msg, &owner->template_options, LTZ_SEND,
self->super.seq_num, NULL, self->key);
}
static gboolean
_publish_message(KafkaDestWorker *self, LogMessage *msg)
{
KafkaDestDriver *owner = (KafkaDestDriver *) self->super.owner;
int block_flag = _is_poller_thread(self) ? 0 : RD_KAFKA_MSG_F_BLOCK;
if (rd_kafka_produce(owner->topic,
RD_KAFKA_PARTITION_UA,
RD_KAFKA_MSG_F_FREE | block_flag,
self->message->str, self->message->len,
self->key->len ? self->key->str : NULL, self->key->len,
log_msg_ref(msg)) == -1)
{
msg_error("kafka: failed to publish message",
evt_tag_str("topic", owner->topic_name),
evt_tag_str("error", rd_kafka_err2str(rd_kafka_last_error())),
evt_tag_str("driver", owner->super.super.super.id),
log_pipe_location_tag(&owner->super.super.super.super));
return FALSE;
}
msg_debug("kafka: message published",
evt_tag_str("topic", owner->topic_name),
evt_tag_str("key", self->key->len ? self->key->str : "NULL"),
evt_tag_str("message", self->message->str),
evt_tag_str("driver", owner->super.super.super.id),
log_pipe_location_tag(&owner->super.super.super.super));
/* we passed the allocated buffers to rdkafka, which will eventually free them */
g_string_steal(self->message);
return TRUE;
}
static void
_update_drain_timer(KafkaDestWorker *self)
{
KafkaDestDriver *owner = (KafkaDestDriver *) self->super.owner;
if (!_is_poller_thread(self))
return;
if (iv_timer_registered(&self->poll_timer))
iv_timer_unregister(&self->poll_timer);
iv_validate_now();
self->poll_timer.expires = iv_now;
timespec_add_msec(&self->poll_timer.expires, owner->poll_timeout);
iv_timer_register(&self->poll_timer);
}
static void
_drain_responses(KafkaDestWorker *self)
{
KafkaDestDriver *owner = (KafkaDestDriver *) self->super.owner;
/* we are only draining responses in the first worker thread, so all
* callbacks originate from the same thread and we don't need to
* synchronize between workers */
if (!_is_poller_thread(self))
return;
gint count = rd_kafka_poll(owner->kafka, 0);
if (count != 0)
{
msg_trace("kafka: destination side rd_kafka_poll() processed some responses",
evt_tag_str("topic", owner->topic_name),
evt_tag_int("count", count),
evt_tag_str("driver", owner->super.super.super.id),
log_pipe_location_tag(&owner->super.super.super.super));
}
_update_drain_timer(self);
}
/*
* Worker thread
*/
static LogThreadedResult
kafka_dest_worker_insert(LogThreadedDestWorker *s, LogMessage *msg)
{
KafkaDestWorker *self = (KafkaDestWorker *)s;
_drain_responses(self);
_format_message_and_key(self, msg);
if (!_publish_message(self, msg))
return LTR_RETRY;
_drain_responses(self);
return LTR_SUCCESS;
}
static void
kafka_dest_worker_free(LogThreadedDestWorker *s)
{
KafkaDestWorker *self = (KafkaDestWorker *)s;
g_string_free(self->key, TRUE);
g_string_free(self->message, TRUE);
log_threaded_dest_worker_free_method(s);
}
static gboolean
_thread_init(LogThreadedDestWorker *s)
{
KafkaDestWorker *self = (KafkaDestWorker *) s;
if (_is_poller_thread(self))
{
KafkaDestDriver *owner = (KafkaDestDriver *) s->owner;
s->time_reopen = owner->poll_timeout / 1000;
}
return log_threaded_dest_worker_init_method(s);
}
LogThreadedDestWorker *
kafka_dest_worker_new(LogThreadedDestDriver *o, gint worker_index)
{
KafkaDestWorker *self = g_new0(KafkaDestWorker, 1);
log_threaded_dest_worker_init_instance(&self->super, o, worker_index);
self->super.thread_init = _thread_init;
self->super.insert = kafka_dest_worker_insert;
self->super.free_fn = kafka_dest_worker_free;
IV_TIMER_INIT(&self->poll_timer);
self->poll_timer.cookie = self;
self->poll_timer.handler = (void (*)(void *)) _drain_responses;
self->key = g_string_sized_new(0);
self->message = g_string_sized_new(1024);
return &self->super;
}
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