1 files changed, 128 insertions, 0 deletions
diff --git a/lib/ns/stats.c b/lib/ns/stats.c
new file mode 100644
index 0000000..de5b083
--- /dev/null
+++ b/lib/ns/stats.c
@@ -0,0 +1,128 @@
+/*
+ * Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+ *
+ * SPDX-License-Identifier: MPL-2.0
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, you can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See the COPYRIGHT file distributed with this work for additional
+ * information regarding copyright ownership.
+ */
+
+/*! \file */
+
+#include <isc/magic.h>
+#include <isc/mem.h>
+#include <isc/refcount.h>
+#include <isc/stats.h>
+#include <isc/util.h>
+
+#include <ns/stats.h>
+
+#define NS_STATS_MAGIC	  ISC_MAGIC('N', 's', 't', 't')
+#define NS_STATS_VALID(x) ISC_MAGIC_VALID(x, NS_STATS_MAGIC)
+
+struct ns_stats {
+	/*% Unlocked */
+	unsigned int magic;
+	isc_mem_t *mctx;
+	isc_stats_t *counters;
+	isc_refcount_t references;
+};
+
+void
+ns_stats_attach(ns_stats_t *stats, ns_stats_t **statsp) {
+	REQUIRE(NS_STATS_VALID(stats));
+	REQUIRE(statsp != NULL && *statsp == NULL);
+
+	isc_refcount_increment(&stats->references);
+
+	*statsp = stats;
+}
+
+void
+ns_stats_detach(ns_stats_t **statsp) {
+	ns_stats_t *stats;
+
+	REQUIRE(statsp != NULL && NS_STATS_VALID(*statsp));
+
+	stats = *statsp;
+	*statsp = NULL;
+
+	if (isc_refcount_decrement(&stats->references) == 1) {
+		isc_stats_detach(&stats->counters);
+		isc_refcount_destroy(&stats->references);
+		isc_mem_putanddetach(&stats->mctx, stats, sizeof(*stats));
+	}
+}
+
+isc_result_t
+ns_stats_create(isc_mem_t *mctx, int ncounters, ns_stats_t **statsp) {
+	ns_stats_t *stats;
+	isc_result_t result;
+
+	REQUIRE(statsp != NULL && *statsp == NULL);
+
+	stats = isc_mem_get(mctx, sizeof(*stats));
+	stats->counters = NULL;
+
+	isc_refcount_init(&stats->references, 1);
+
+	result = isc_stats_create(mctx, &stats->counters, ncounters);
+	if (result != ISC_R_SUCCESS) {
+		goto clean_mem;
+	}
+
+	stats->magic = NS_STATS_MAGIC;
+	stats->mctx = NULL;
+	isc_mem_attach(mctx, &stats->mctx);
+	*statsp = stats;
+
+	return (ISC_R_SUCCESS);
+
+clean_mem:
+	isc_mem_put(mctx, stats, sizeof(*stats));
+
+	return (result);
+}
+
+/*%
+ * Increment/Decrement methods
+ */
+void
+ns_stats_increment(ns_stats_t *stats, isc_statscounter_t counter) {
+	REQUIRE(NS_STATS_VALID(stats));
+
+	isc_stats_increment(stats->counters, counter);
+}
+
+void
+ns_stats_decrement(ns_stats_t *stats, isc_statscounter_t counter) {
+	REQUIRE(NS_STATS_VALID(stats));
+
+	isc_stats_decrement(stats->counters, counter);
+}
+
+isc_stats_t *
+ns_stats_get(ns_stats_t *stats) {
+	REQUIRE(NS_STATS_VALID(stats));
+
+	return (stats->counters);
+}
+
+void
+ns_stats_update_if_greater(ns_stats_t *stats, isc_statscounter_t counter,
+			   isc_statscounter_t value) {
+	REQUIRE(NS_STATS_VALID(stats));
+
+	isc_stats_update_if_greater(stats->counters, counter, value);
+}
+
+isc_statscounter_t
+ns_stats_get_counter(ns_stats_t *stats, isc_statscounter_t counter) {
+	REQUIRE(NS_STATS_VALID(stats));
+
+	return (isc_stats_get_counter(stats->counters, counter));
+}