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/* Copyright (c) 2007-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file metrics.c
* @brief Metrics subsystem.
**/
#include "orconfig.h"
#include "lib/container/smartlist.h"
#include "lib/log/util_bug.h"
#include "lib/malloc/malloc.h"
#include "lib/metrics/metrics_store.h"
#include "lib/string/printf.h"
#include "feature/metrics/metrics.h"
#include "app/main/subsysmgr.h"
/** Return newly allocated string containing the output of all subsystems
* having metrics.
*
* This is used to output the content on the MetricsPort. */
char *
metrics_get_output(const metrics_format_t fmt)
{
char *data;
smartlist_t *chunks = smartlist_new();
/* Go over all subsystems that exposes a metrics store. */
for (unsigned i = 0; i < n_tor_subsystems; ++i) {
const smartlist_t *stores;
const subsys_fns_t *sys = tor_subsystems[i];
/* Skip unsupported subsystems. */
if (!sys->supported) {
continue;
}
if (sys->get_metrics && (stores = sys->get_metrics())) {
SMARTLIST_FOREACH_BEGIN(stores, const metrics_store_t *, store) {
smartlist_add(chunks, metrics_store_get_output(fmt, store));
} SMARTLIST_FOREACH_END(store);
}
}
data = smartlist_join_strings(chunks, "\n", 0, NULL);
SMARTLIST_FOREACH(chunks, char *, c, tor_free(c));
smartlist_free(chunks);
return data;
}
/** Initialize the subsystem. */
void
metrics_init(void)
{
}
/** Cleanup and free any global memory of this subsystem. */
void
metrics_cleanup(void)
{
}
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