gauge.h

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/*
 * Copyright (c) 2024 Mustafa Abdullah Kus, Sparse Technology
 * Copyright (c) 2024 Nordic Semiconductor
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
#ifndef ZEPHYR_INCLUDE_PROMETHEUS_GAUGE_H_
#define ZEPHYR_INCLUDE_PROMETHEUS_GAUGE_H_
 
#include <zephyr/sys/iterable_sections.h>
#include <zephyr/net/prometheus/metric.h>
 
struct prometheus_gauge {
        struct prometheus_metric base;
        double value;
        void *user_data;
};
 
#define PROMETHEUS_GAUGE_DEFINE(_name, _desc, _label, _collector, ...)  \
        STRUCT_SECTION_ITERABLE(prometheus_gauge, _name) = {            \
                .base.name = STRINGIFY(_name),                          \
                .base.type = PROMETHEUS_GAUGE,                          \
                .base.description = _desc,                              \
                .base.labels[0] = __DEBRACKET _label,                   \
                .base.num_labels = 1,                                   \
                .base.collector = _collector,                           \
                .value = 0.0,                                           \
                .user_data = COND_CODE_0(                               \
                        NUM_VA_ARGS_LESS_1(LIST_DROP_EMPTY(__VA_ARGS__, _)), \
                        (NULL),                                         \
                        (GET_ARG_N(1, __VA_ARGS__))),                   \
        }
 
int prometheus_gauge_set(struct prometheus_gauge *gauge, double value);
 
#endif /* ZEPHYR_INCLUDE_PROMETHEUS_GAUGE_H_ */