/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*  Fluent Bit

 *  ==========

 *  Copyright (C) 2015-2024 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_input_plugin.h>

#include <fluent-bit/flb_utils.h>

#include <fluent-bit/flb_unescape.h>

#include "udp.h"

#include "udp_conn.h"

#include "udp_config.h"

#include <stdlib.h>

struct flb_in_udp_config *udp_config_init(struct flb_input_instance *ins)

{

    int ret;

    int len;

    char port[16];

    char *out;

    struct flb_in_udp_config *ctx;

    /* Allocate plugin context */

    ctx = flb_calloc(1, sizeof(struct flb_in_udp_config));

    if (!ctx) {

        flb_errno();

        return NULL;

    }

    ctx->ins = ins;

    ctx->format = FLB_UDP_FMT_JSON;

    /* Load the config map */

    ret = flb_input_config_map_set(ins, (void *)ctx);

    if (ret == -1) {

        flb_plg_error(ins, "unable to load configuration");

        flb_free(ctx);

        return NULL;

    }

    /* Data format (expected payload) */

    if (ctx->format_name) {

        if (strcasecmp(ctx->format_name, "json") == 0) {

            ctx->format = FLB_UDP_FMT_JSON;

        }

        else if (strcasecmp(ctx->format_name, "none") == 0) {

            ctx->format = FLB_UDP_FMT_NONE;

        }

        else {

            flb_plg_error(ctx->ins, "unrecognized format value '%s'", ctx->format_name);

            flb_free(ctx);

            return NULL;

        }

    }

    /* String separator used to split records when using 'format none' */

    if (ctx->raw_separator) {

        len = strlen(ctx->raw_separator);

        out = flb_malloc(len + 1);

        if (!out) {

            flb_errno();

            flb_free(ctx);

            return NULL;

        }

        ret = flb_unescape_string(ctx->raw_separator, len, &out);

        if (ret <= 0) {

            flb_plg_error(ctx->ins, "invalid separator");

            flb_free(out);

            flb_free(ctx);

            return NULL;

        }

        ctx->separator = flb_sds_create_len(out, ret);

        if (!ctx->separator) {

            flb_free(out);

            flb_free(ctx);

            return NULL;

        }

        flb_free(out);

    }

    if (!ctx->separator) {

        ctx->separator = flb_sds_create_len("\n", 1);

    }

    /* Listen interface (if not set, defaults to 0.0.0.0:5170) */

    flb_input_net_default_listener("0.0.0.0", 5170, ins);

    ctx->listen = ins->host.listen;

    snprintf(port, sizeof(port) - 1, "%d", ins->host.port);

    ctx->port = flb_strdup(port);

    /* Chunk size */

    if (ctx->chunk_size_str) {

        /* Convert KB unit to Bytes */

        ctx->chunk_size  = (atoi(ctx->chunk_size_str) * 1024);

    } else {

        ctx->chunk_size  = atoi(FLB_IN_UDP_CHUNK);

    }

    /* Buffer size */

    if (!ctx->buffer_size_str) {

        ctx->buffer_size = ctx->chunk_size;

    }

    else {

        /* Convert KB unit to Bytes */

        ctx->buffer_size  = (atoi(ctx->buffer_size_str) * 1024);

    }

    ctx->log_encoder = flb_log_event_encoder_create(FLB_LOG_EVENT_FORMAT_DEFAULT);

    if (ctx->log_encoder == NULL) {

        flb_plg_error(ctx->ins, "could not initialize event encoder");

        udp_config_destroy(ctx);

        ctx = NULL;

    }

    return ctx;

}

int udp_config_destroy(struct flb_in_udp_config *ctx)

{

    if (ctx->log_encoder != NULL) {

        flb_log_event_encoder_destroy(ctx->log_encoder);

    }

    if (ctx->collector_id != -1) {

        flb_input_collector_delete(ctx->collector_id, ctx->ins);

        ctx->collector_id = -1;

    }

    if (ctx->downstream != NULL) {

        flb_downstream_destroy(ctx->downstream);

    }

    flb_sds_destroy(ctx->separator);

    flb_free(ctx->port);

    flb_free(ctx);

    return 0;

}