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/* Copyright (c) 2020-2021, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file metrics_common.h
* @brief Header for lib/metrics/metrics_common.c
**/
#ifndef TOR_LIB_METRICS_METRICS_COMMON_H
#define TOR_LIB_METRICS_METRICS_COMMON_H
#include "lib/cc/torint.h"
/** Helper macro that must be used to construct the right namespaced metrics
* name. A name is a string so stringify the result. */
#define METRICS_STR(val) #val
#define METRICS_NAME(name) METRICS_STR(tor_ ## name)
/** Format output type. */
typedef enum {
/** Prometheus data output format. */
METRICS_FORMAT_PROMETHEUS = 1,
} metrics_format_t;
/** Metric type. */
typedef enum {
/* Increment only. */
METRICS_TYPE_COUNTER,
/* Can go up or down. */
METRICS_TYPE_GAUGE,
} metrics_type_t;
/** Metric counter object (METRICS_TYPE_COUNTER). */
typedef struct metrics_counter_t {
uint64_t value;
} metrics_counter_t;
/** Metric gauge object (METRICS_TYPE_GAUGE). */
typedef struct metrics_gauge_t {
int64_t value;
} metrics_gauge_t;
const char *metrics_type_to_str(const metrics_type_t type);
/* Helpers. */
const char *metrics_format_label(const char *key, const char *value);
#endif /* !defined(TOR_LIB_METRICS_METRICS_COMMON_H) */
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