flb_input_trace.c

/* -*- 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_info.h>
#include <fluent-bit/flb_input.h>
#include <fluent-bit/flb_input_chunk.h>
#include <fluent-bit/flb_input_trace.h>
#include <fluent-bit/flb_input_plugin.h>

#include <ctraces/ctraces.h>
#include <ctraces/ctr_decode_msgpack.h>

static int input_trace_append(struct flb_input_instance *ins,
                              size_t processor_starting_stage,
                              const char *tag, size_t tag_len,
                              struct ctrace *ctr)
{
    int ret;
    char *out_buf;
    size_t out_size;
    int processor_is_active;

    processor_is_active = flb_processor_is_active(ins->processor);
    if (processor_is_active) {
        if (!tag) {
            if (ins->tag && ins->tag_len > 0) {
                tag = ins->tag;
                tag_len = ins->tag_len;
            }
            else {
                tag = ins->name;
                tag_len = strlen(ins->name);
            }
        }

        ret = flb_processor_run(ins->processor,
                                processor_starting_stage,
                                FLB_PROCESSOR_TRACES,
                                tag, tag_len,
                                (char *) ctr,
                                0, NULL, NULL);

        if (ret == -1) {
            return -1;
        }
    }

    /* Convert trace context to msgpack */
    ret = ctr_encode_msgpack_create(ctr, &out_buf, &out_size);
    if (ret != 0) {
        flb_plg_error(ins, "could not encode traces");
        return -1;
    }

    /* Append packed metrics */
    ret = flb_input_chunk_append_raw(ins, FLB_INPUT_TRACES, 0,
                                     tag, tag_len, out_buf, out_size);

    ctr_encode_msgpack_destroy(out_buf);

    return ret;
}

/* Take a CTrace context and enqueue it as a Trace chunk */
int flb_input_trace_append(struct flb_input_instance *ins,
                           const char *tag, size_t tag_len,
                           struct ctrace *ctr)
{
    return input_trace_append(ins,
                              0,
                              tag, tag_len,
                              ctr);
}

/* Take a CTrace context and enqueue it as a Trace chunk */
int flb_input_trace_append_skip_processor_stages(
        struct flb_input_instance *ins,
        size_t processor_starting_stage,
        const char *tag, size_t tag_len,
        struct ctrace *ctr)
{
    return input_trace_append(ins,
                              processor_starting_stage,
                              tag, tag_len,
                              ctr);
}