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

/*  Fluent Bit

 *  ==========

 *  Copyright (C) 2015-2026 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/multiline/flb_ml.h>

#include <fluent-bit/multiline/flb_ml_rule.h>

#include <fluent-bit/multiline/flb_ml_parser.h>

#define rule flb_ml_rule_create

static void rule_error(struct flb_ml_parser *mlp)

{

    int id;

    id = mk_list_size(&mlp->regex_rules);

    flb_error("[multiline: go] rule #%i could not be created", id);

    flb_ml_parser_destroy(mlp);

}

/* Go mode */

struct flb_ml_parser *flb_ml_parser_go(struct flb_config *config, char *key)

{

    int ret;

    struct flb_ml_parser *mlp;

    mlp = flb_ml_parser_create(config,               /* Fluent Bit context */

                               "go",                 /* name      */

                               FLB_ML_REGEX,         /* type      */

                               NULL,                 /* match_str */

                               FLB_FALSE,            /* negate    */

                               FLB_ML_FLUSH_TIMEOUT, /* flush_ms  */

                               key,                  /* key_content */

                               NULL,                 /* key_group   */

                               NULL,                 /* key_pattern */

                               NULL,                 /* parser ctx  */

                               NULL);                /* parser name */

    if (!mlp) {

        flb_error("[multiline] could not create 'go mode'");

        return NULL;

    }

    ret = rule(mlp,

               "start_state",

               "/\\bpanic: /",

               "go_after_panic", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    ret = rule(mlp,

               "start_state",

               "/http: panic serving/",

               "go_goroutine", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    ret = rule(mlp,

               "go_after_panic",

               "/^$/",

               "go_goroutine", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    ret = rule(mlp,

               "go_after_panic, go_after_signal, go_frame_1",

               "/^$/",

               "go_goroutine", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    ret = rule(mlp,

               "go_after_panic",

               "/^\\[signal /",

               "go_after_signal", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    ret = rule(mlp,

               "go_goroutine",

               "/^goroutine \\d+ \\[[^\\]]+\\]:$/",

               "go_frame_1", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    ret = rule(mlp,

               "go_frame_1",

               "/^(?:[^\\s.:]+\\.)*[^\\s.():]+\\(|^created by /",

               "go_frame_2", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    ret = rule(mlp,

               "go_frame_2",

               "/^\\s/",

               "go_frame_1", NULL);

    if (ret != 0) {

        rule_error(mlp);

        return NULL;

    }

    /* Map the rules (mandatory for regex rules) */

    ret = flb_ml_parser_init(mlp);

    if (ret != 0) {

        flb_error("[multiline: go] error on mapping rules");

        flb_ml_parser_destroy(mlp);

        return NULL;

    }

    return mlp;

}