From a47edf08d0eb7c1a934844edf6520762720d07de Mon Sep 17 00:00:00 2001
From: 9seconds <nineseconds@yandex.ru>
Date: Mon, 3 Feb 2020 11:26:37 +0300
Subject: [PATCH 1/2] Add possibility to disable antireplay cache

---
 antireplay/cache.go    |  8 ++++----
 antireplay/init.go     | 15 +++++++++++++--
 antireplay/nilcache.go |  8 ++++++++
 3 files changed, 25 insertions(+), 6 deletions(-)
 create mode 100644 antireplay/nilcache.go

diff --git a/antireplay/cache.go b/antireplay/cache.go
index 9eb08ab..dab3af4 100644
--- a/antireplay/cache.go
+++ b/antireplay/cache.go
@@ -11,19 +11,19 @@ type cache struct {
 	data *fastcache.Cache
 }
 
-func (c *cache) AddObfuscated2(data []byte) {
+func (c cache) AddObfuscated2(data []byte) {
 	c.data.Set(keyObfuscated2(data), nil)
 }
 
-func (c *cache) AddTLS(data []byte) {
+func (c cache) AddTLS(data []byte) {
 	c.data.Set(keyTLS(data), nil)
 }
 
-func (c *cache) HasObfuscated2(data []byte) bool {
+func (c cache) HasObfuscated2(data []byte) bool {
 	return c.data.Has(keyObfuscated2(data))
 }
 
-func (c *cache) HasTLS(data []byte) bool {
+func (c cache) HasTLS(data []byte) bool {
 	return c.data.Has(keyTLS(data))
 }
 
diff --git a/antireplay/init.go b/antireplay/init.go
index 9caa19e..3fa30f8 100644
--- a/antireplay/init.go
+++ b/antireplay/init.go
@@ -8,13 +8,24 @@ import (
 	"github.com/9seconds/mtg/config"
 )
 
+type CacheInterface interface {
+	AddObfuscated2([]byte)
+	AddTLS([]byte)
+	HasObfuscated2([]byte) bool
+	HasTLS([]byte) bool
+}
+
 var (
-	Cache    cache
+	Cache    CacheInterface
 	initOnce sync.Once
 )
 
 func Init() {
 	initOnce.Do(func() {
-		Cache.data = fastcache.New(config.C.AntiReplayMaxSize)
+		if config.C.AntiReplayMaxSize == 0 {
+			Cache = nilCache{}
+		} else {
+			Cache = cache{fastcache.New(config.C.AntiReplayMaxSize)}
+		}
 	})
 }
diff --git a/antireplay/nilcache.go b/antireplay/nilcache.go
new file mode 100644
index 0000000..baa0947
--- /dev/null
+++ b/antireplay/nilcache.go
@@ -0,0 +1,8 @@
+package antireplay
+
+type nilCache struct{}
+
+func (n nilCache) AddObfuscated2(_ []byte)      {}
+func (n nilCache) AddTLS(_ []byte)              {}
+func (n nilCache) HasObfuscated2(_ []byte) bool { return false }
+func (n nilCache) HasTLS(_ []byte) bool         { return false }

From 2407748ab03cd219ea63795411b441762cc21ced Mon Sep 17 00:00:00 2001
From: 9seconds <nineseconds@yandex.ru>
Date: Mon, 3 Feb 2020 11:27:12 +0300
Subject: [PATCH 2/2] Update README

---
 README.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/README.md b/README.md
index 6ae8c3f..a24076e 100644
--- a/README.md
+++ b/README.md
@@ -159,6 +159,9 @@ by design and we have the negligible possibility of duplication
 (probability is 1/(2^64)) but it could be quite effective to prevent
 replays.
 
+It is possible to disable this cache. To do that, please explicitly set
+its size to 0.
+
 
 ## FakeTLS