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/* Copyright (c) 2021, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file relay_metrics.c
* @brief Relay metrics exposed through the MetricsPort
**/
#define RELAY_METRICS_ENTRY_PRIVATE
#include "orconfig.h"
#include "lib/malloc/malloc.h"
#include "lib/container/smartlist.h"
#include "lib/metrics/metrics_store.h"
#include "lib/log/util_bug.h"
#include "feature/relay/relay_metrics.h"
/** The base metrics that is a static array of metrics added to the metrics
* store.
*
* The key member MUST be also the index of the entry in the array. */
static const relay_metrics_entry_t base_metrics[] = {};
static const size_t num_base_metrics = ARRAY_LENGTH(base_metrics);
/** The only and single store of all the relay metrics. */
static metrics_store_t *the_store;
/** Return a list of all the relay metrics stores. This is the
* function attached to the .get_metrics() member of the subsys_t. */
const smartlist_t *
relay_metrics_get_stores(void)
{
/* We can't have the caller to free the returned list so keep it static,
* simply update it. */
static smartlist_t *stores_list = NULL;
if (!stores_list) {
stores_list = smartlist_new();
smartlist_add(stores_list, the_store);
}
return stores_list;
}
/** Initialize the relay metrics. */
void
relay_metrics_init(void)
{
if (BUG(the_store)) {
return;
}
the_store = metrics_store_new();
}
/** Free the relay metrics. */
void
relay_metrics_free(void)
{
if (!the_store) {
return;
}
/* NULL is set with this call. */
metrics_store_free(the_store);
}
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