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/* Copyright (c) 2020-2021, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* @file prometheus.c
* @brief Metrics format driver for Prometheus data model.
**/
#define METRICS_STORE_ENTRY_PRIVATE
#include "orconfig.h"
#include "lib/container/smartlist.h"
#include "lib/log/util_bug.h"
#include "lib/malloc/malloc.h"
#include "lib/string/printf.h"
#include "lib/metrics/prometheus.h"
/** Return a static buffer containing all the labels properly formatted
* for the output as a string.
*
* Subsequent calls to this invalidates the previous result. */
static const char *
format_labels(smartlist_t *labels)
{
static char buf[1024];
char *line = NULL;
if (smartlist_len(labels) == 0) {
buf[0] = '\0';
goto end;
}
line = smartlist_join_strings(labels, ",", 0, NULL);
tor_snprintf(buf, sizeof(buf), "{%s}", line);
end:
tor_free(line);
return buf;
}
/** Format the given entry in to the buffer data. */
void
prometheus_format_store_entry(const metrics_store_entry_t *entry, buf_t *data)
{
tor_assert(entry);
tor_assert(data);
buf_add_printf(data, "# HELP %s %s\n", entry->name, entry->help);
buf_add_printf(data, "# TYPE %s %s\n", entry->name,
metrics_type_to_str(entry->type));
buf_add_printf(data, "%s%s %" PRIi64 "\n", entry->name,
format_labels(entry->labels),
metrics_store_entry_get_value(entry));
}
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