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/* Copyright (c) 2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file metrics_store_entry.h
* @brief Header for lib/metrics/metrics_store_entry.c
**/
#ifndef TOR_LIB_METRICS_METRICS_STORE_ENTRY_H
#define TOR_LIB_METRICS_METRICS_STORE_ENTRY_H
#include "lib/cc/torint.h"
#include "lib/metrics/metrics_common.h"
#ifdef METRICS_STORE_ENTRY_PRIVATE
/** Metrics store entry. They reside in a metrics_store_t object and are
* opaque to the outside world. */
struct metrics_store_entry_t {
/** Type of entry. */
metrics_type_t type;
/** Name. */
char *name;
/** Help comment string. */
char *help;
/** Labels attached to that entry. If NULL, no labels.
*
* Labels are used to add extra context to a metrics. For example, a label
* could be an onion address so the metrics can be differentiate. */
smartlist_t *labels;
/* Actual data. */
union {
metrics_counter_t counter;
metrics_gauge_t gauge;
} u;
};
#endif /* METRICS_STORE_ENTRY_PRIVATE */
typedef struct metrics_store_entry_t metrics_store_entry_t;
/* Allocators. */
metrics_store_entry_t *metrics_store_entry_new(const metrics_type_t type,
const char *name,
const char *help);
void metrics_store_entry_free_(metrics_store_entry_t *entry);
#define metrics_store_entry_free(entry) \
FREE_AND_NULL(metrics_store_entry_t, metrics_store_entry_free_, (entry));
/* Accessors. */
int64_t metrics_store_entry_get_value(const metrics_store_entry_t *entry);
bool metrics_store_entry_has_label(const metrics_store_entry_t *entry,
const char *label);
/* Modifiers. */
void metrics_store_entry_add_label(metrics_store_entry_t *entry,
const char *label);
void metrics_store_entry_reset(metrics_store_entry_t *entry);
void metrics_store_entry_update(metrics_store_entry_t *entry,
const int64_t value);
#endif /* !defined(TOR_LIB_METRICS_METRICS_STORE_ENTRY_H) */
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