Feature: flush fakeip pool

component/fakeip/cachefile.go

@@ -53,3 +53,8 @@ func (c *cachefileStore) Exist(ip net.IP) bool {
 // CloneTo implements store.CloneTo
 // already persistence
 func (c *cachefileStore) CloneTo(store store) {}
+
+// FlushFakeIP implements store.FlushFakeIP
+func (c *cachefileStore) FlushFakeIP() error {
+	return c.cache.FlushFakeIP()
+}

component/fakeip/memory.go

@@ -67,3 +67,8 @@ func (m *memoryStore) CloneTo(store store) {
 		m.cache.CloneTo(ms.cache)
 	}
 }
+
+// FlushFakeIP implements store.FlushFakeIP
+func (m *memoryStore) FlushFakeIP() error {
+	return m.cache.Clear()
+}

component/fakeip/pool.go

@@ -18,6 +18,7 @@ type store interface {
 	DelByIP(ip net.IP)
 	Exist(ip net.IP) bool
 	CloneTo(store)
+	FlushFakeIP() error
 }
 
 // Pool is a implementation about fake ip generator without storage
@@ -120,6 +121,10 @@ func (p *Pool) get(host string) net.IP {
 	return ip
 }
 
+func (p *Pool) FlushFakeIP() error {
+	return p.store.FlushFakeIP()
+}
+
 func ipToUint(ip net.IP) uint32 {
 	v := uint32(ip[0]) << 24
 	v += uint32(ip[1]) << 16

component/fakeip/pool_test.go

@@ -193,3 +193,59 @@ func TestPool_Error(t *testing.T) {
 
 	assert.Error(t, err)
 }
+
+func TestPool_FlushFileCache(t *testing.T) {
+	_, ipnet, _ := net.ParseCIDR("192.168.0.1/28")
+	pools, tempfile, err := createPools(Options{
+		IPNet: ipnet,
+		Size:  10,
+	})
+	assert.Nil(t, err)
+	defer os.Remove(tempfile)
+
+	for _, pool := range pools {
+		foo := pool.Lookup("foo.com")
+		bar := pool.Lookup("baz.com")
+		bax := pool.Lookup("baz.com")
+		fox := pool.Lookup("foo.com")
+
+		err = pool.FlushFakeIP()
+		assert.Nil(t, err)
+
+		baz := pool.Lookup("foo.com")
+		next := pool.Lookup("baz.com")
+		nero := pool.Lookup("foo.com")
+
+		assert.Equal(t, foo, fox)
+		assert.NotEqual(t, foo, baz)
+		assert.Equal(t, bar, bax)
+		assert.NotEqual(t, bar, next)
+		assert.Equal(t, baz, nero)
+	}
+}
+
+func TestPool_FlushMemoryCache(t *testing.T) {
+	_, ipnet, _ := net.ParseCIDR("192.168.0.1/28")
+	pool, _ := New(Options{
+		IPNet: ipnet,
+		Size:  10,
+	})
+
+	foo := pool.Lookup("foo.com")
+	bar := pool.Lookup("baz.com")
+	bax := pool.Lookup("baz.com")
+	fox := pool.Lookup("foo.com")
+
+	err := pool.FlushFakeIP()
+	assert.Nil(t, err)
+
+	baz := pool.Lookup("foo.com")
+	next := pool.Lookup("baz.com")
+	nero := pool.Lookup("foo.com")
+
+	assert.Equal(t, foo, fox)
+	assert.NotEqual(t, foo, baz)
+	assert.Equal(t, bar, bax)
+	assert.NotEqual(t, bar, next)
+	assert.Equal(t, baz, nero)
+}