resolved: add DNS cache

[elogind.git] / src / resolve / resolved-dns-cache.h

diff --git a/src/resolve/resolved-dns-cache.h b/src/resolve/resolved-dns-cache.h
new file mode 100644 (file)
index 0000000..8d1cf95
--- /dev/null
+++ b/src/resolve/resolved-dns-cache.h
@@ -0,0 +1,57 @@
+/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/
+
+#pragma once
+
+/***
+  This file is part of systemd.
+
+  Copyright 2014 Lennart Poettering
+
+  systemd is free software; you can redistribute it and/or modify it
+  under the terms of the GNU Lesser General Public License as published by
+  the Free Software Foundation; either version 2.1 of the License, or
+  (at your option) any later version.
+
+  systemd is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with systemd; If not, see <http://www.gnu.org/licenses/>.
+***/
+
+#include <sys/types.h>
+
+#include "hashmap.h"
+#include "prioq.h"
+#include "time-util.h"
+#include "list.h"
+
+typedef struct DnsCacheItem DnsCacheItem;
+
+typedef struct DnsCache {
+        Hashmap *rrsets;
+        Prioq *expire;
+} DnsCache;
+
+#include "resolved-dns-rr.h"
+
+typedef struct DnsCacheItem {
+        DnsResourceRecord *rr;
+        usec_t timestamp;
+        unsigned expire_prioq_idx;
+        LIST_FIELDS(DnsCacheItem, rrsets);
+} DnsCacheItem;
+
+void dns_cache_flush(DnsCache *c);
+void dns_cache_prune(DnsCache *c);
+
+void dns_cache_remove(DnsCache *c, DnsResourceKey *key);
+
+int dns_cache_put(DnsCache *c, DnsResourceRecord *rr, usec_t timestamp);
+int dns_cache_put_rrs(DnsCache *c, DnsResourceRecord **rrs, unsigned n_rrs, usec_t timestamp);
+
+DnsCacheItem* dns_cache_lookup(DnsCache *c, DnsResourceKey *key);
+DnsCacheItem* dns_cache_get(DnsCache *c, DnsResourceRecord *rr);
+int dns_cache_lookup_many(DnsCache *c, DnsResourceKey *keys, unsigned n_keys, DnsResourceRecord ***rrs);