Move code to pkg

pkg/server/service/bufferpool.go

@@ -0,0 +1,27 @@
+package service
+
+import "sync"
+
+const bufferPoolSize = 32 * 1024
+
+func newBufferPool() *bufferPool {
+	return &bufferPool{
+		pool: sync.Pool{
+			New: func() interface{} {
+				return make([]byte, bufferPoolSize)
+			},
+		},
+	}
+}
+
+type bufferPool struct {
+	pool sync.Pool
+}
+
+func (b *bufferPool) Get() []byte {
+	return b.pool.Get().([]byte)
+}
+
+func (b *bufferPool) Put(bytes []byte) {
+	b.pool.Put(bytes)
+}