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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* Fluent Bit
* ==========
* Copyright (C) 2015-2022 The Fluent Bit Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <fluent-bit/flb_info.h>
#include <fluent-bit/flb_output.h>
#include <fluent-bit/flb_mem.h>
#include <fluent-bit/flb_kv.h>
#include <fluent-bit/flb_utils.h>
#include "kafka_config.h"
#include "kafka_topic.h"
#include "kafka_callbacks.h"
struct flb_out_kafka *flb_out_kafka_create(struct flb_output_instance *ins,
struct flb_config *config)
{
int ret;
const char *tmp;
char errstr[512];
struct mk_list *head;
struct mk_list *topics;
struct flb_split_entry *entry;
struct flb_out_kafka *ctx;
/* Configuration context */
ctx = flb_calloc(1, sizeof(struct flb_out_kafka));
if (!ctx) {
flb_errno();
return NULL;
}
ctx->ins = ins;
ctx->blocked = FLB_FALSE;
ret = flb_output_config_map_set(ins, (void*) ctx);
if (ret == -1) {
flb_plg_error(ins, "unable to load configuration.");
flb_free(ctx);
return NULL;
}
/* rdkafka config context */
ctx->conf = flb_kafka_conf_create(&ctx->kafka, &ins->properties, 0);
if (!ctx->conf) {
flb_plg_error(ctx->ins, "error creating context");
flb_free(ctx);
return NULL;
}
/* Set our global opaque data (plugin context*/
rd_kafka_conf_set_opaque(ctx->conf, ctx);
/* Callback: message delivery */
rd_kafka_conf_set_dr_msg_cb(ctx->conf, cb_kafka_msg);
/* Callback: log */
rd_kafka_conf_set_log_cb(ctx->conf, cb_kafka_logger);
/* Config: Topic_Key */
if (ctx->topic_key) {
ctx->topic_key_len = strlen(ctx->topic_key);
}
/* Config: Format */
if (ctx->format_str) {
if (strcasecmp(ctx->format_str, "json") == 0) {
ctx->format = FLB_KAFKA_FMT_JSON;
}
else if (strcasecmp(ctx->format_str, "msgpack") == 0) {
ctx->format = FLB_KAFKA_FMT_MSGP;
}
else if (strcasecmp(ctx->format_str, "gelf") == 0) {
ctx->format = FLB_KAFKA_FMT_GELF;
}
#ifdef FLB_HAVE_AVRO_ENCODER
else if (strcasecmp(ctx->format_str, "avro") == 0) {
ctx->format = FLB_KAFKA_FMT_AVRO;
}
#endif
}
else {
ctx->format = FLB_KAFKA_FMT_JSON;
}
/* Config: Message_Key */
if (ctx->message_key) {
ctx->message_key_len = strlen(ctx->message_key);
}
else {
ctx->message_key_len = 0;
}
/* Config: Message_Key_Field */
if (ctx->message_key_field) {
ctx->message_key_field_len = strlen(ctx->message_key_field);
}
else {
ctx->message_key_field_len = 0;
}
/* Config: Timestamp_Key */
if (ctx->timestamp_key) {
ctx->timestamp_key_len = strlen(ctx->timestamp_key);
}
/* Config: Timestamp_Format */
ctx->timestamp_format = FLB_JSON_DATE_DOUBLE;
if (ctx->timestamp_format_str) {
if (strcasecmp(ctx->timestamp_format_str, "iso8601") == 0) {
ctx->timestamp_format = FLB_JSON_DATE_ISO8601;
}
else if (strcasecmp(ctx->timestamp_format_str, "iso8601_ns") == 0) {
ctx->timestamp_format = FLB_JSON_DATE_ISO8601_NS;
}
}
/* set number of retries: note that if the number is zero, means forever */
if (ctx->queue_full_retries < 0) {
ctx->queue_full_retries = 0;
}
/* Config Gelf_Short_Message_Key */
tmp = flb_output_get_property("gelf_short_message_key", ins);
if (tmp) {
ctx->gelf_fields.short_message_key = flb_sds_create(tmp);
}
/* Config Gelf_Full_Message_Key */
tmp = flb_output_get_property("gelf_full_message_key", ins);
if (tmp) {
ctx->gelf_fields.full_message_key = flb_sds_create(tmp);
}
/* Config Gelf_Level_Key */
tmp = flb_output_get_property("gelf_level_key", ins);
if (tmp) {
ctx->gelf_fields.level_key = flb_sds_create(tmp);
}
/* Kafka Producer */
ctx->kafka.rk = rd_kafka_new(RD_KAFKA_PRODUCER, ctx->conf,
errstr, sizeof(errstr));
if (!ctx->kafka.rk) {
flb_plg_error(ctx->ins, "failed to create producer: %s",
errstr);
flb_out_kafka_destroy(ctx);
return NULL;
}
#ifdef FLB_HAVE_AVRO_ENCODER
/* Config AVRO */
tmp = flb_output_get_property("schema_str", ins);
if (tmp) {
ctx->avro_fields.schema_str = flb_sds_create(tmp);
}
tmp = flb_output_get_property("schema_id", ins);
if (tmp) {
ctx->avro_fields.schema_id = flb_sds_create(tmp);
}
#endif
/* Config: Topic */
mk_list_init(&ctx->topics);
tmp = flb_output_get_property("topics", ins);
if (!tmp) {
flb_kafka_topic_create(FLB_KAFKA_TOPIC, ctx);
}
else {
topics = flb_utils_split(tmp, ',', -1);
if (!topics) {
flb_plg_warn(ctx->ins, "invalid topics defined, setting default");
flb_kafka_topic_create(FLB_KAFKA_TOPIC, ctx);
}
else {
/* Register each topic */
mk_list_foreach(head, topics) {
entry = mk_list_entry(head, struct flb_split_entry, _head);
if (!flb_kafka_topic_create(entry->value, ctx)) {
flb_plg_error(ctx->ins, "cannot register topic '%s'",
entry->value);
}
}
flb_utils_split_free(topics);
}
}
flb_plg_info(ctx->ins, "brokers='%s' topics='%s'", ctx->kafka.brokers, tmp);
#ifdef FLB_HAVE_AVRO_ENCODER
flb_plg_info(ctx->ins, "schemaID='%s' schema='%s'", ctx->avro_fields.schema_id, ctx->avro_fields.schema_str);
#endif
return ctx;
}
int flb_out_kafka_destroy(struct flb_out_kafka *ctx)
{
if (!ctx) {
return 0;
}
if (ctx->kafka.brokers) {
flb_free(ctx->kafka.brokers);
}
flb_kafka_topic_destroy_all(ctx);
if (ctx->kafka.rk) {
rd_kafka_destroy(ctx->kafka.rk);
}
if (ctx->topic_key) {
flb_free(ctx->topic_key);
}
if (ctx->message_key) {
flb_free(ctx->message_key);
}
if (ctx->message_key_field) {
flb_free(ctx->message_key_field);
}
flb_sds_destroy(ctx->gelf_fields.timestamp_key);
flb_sds_destroy(ctx->gelf_fields.host_key);
flb_sds_destroy(ctx->gelf_fields.short_message_key);
flb_sds_destroy(ctx->gelf_fields.full_message_key);
flb_sds_destroy(ctx->gelf_fields.level_key);
#ifdef FLB_HAVE_AVRO_ENCODER
// avro
flb_sds_destroy(ctx->avro_fields.schema_id);
flb_sds_destroy(ctx->avro_fields.schema_str);
#endif
flb_free(ctx);
return 0;
}
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