lib: New metrics library

Used to provide an interface to create metrics store and update the entries.

Related to #40063

Signed-off-by: David Goulet <dgoulet@torproject.org>

1 files changed, 29 insertions, 0 deletions

diff --git a/src/lib/metrics/metrics_common.c b/src/lib/metrics/metrics_common.c
new file mode 100644
index 0000000000..5941a4d892
--- /dev/null
+++ b/src/lib/metrics/metrics_common.c
@@ -0,0 +1,29 @@
+/* 2020, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+/**
+ * @file metrics_common.c
+ * @brief Common code for the metrics library
+ **/
+
+#include <stddef.h>
+
+#include "orconfig.h"
+
+#include "lib/log/util_bug.h"
+
+#include "lib/metrics/metrics_common.h"
+
+/** Return string representation of a metric type. */
+const char *
+metrics_type_to_str(const metrics_type_t type)
+{
+  switch (type) {
+  case METRICS_TYPE_COUNTER:
+    return "counter";
+  case METRICS_TYPE_GAUGE:
+    return "gauge";
+  default:
+    tor_assert_unreached();
+  }
+}