쿠폰 이름 해시 로직 변경

coupon/helper.go

@@ -0,0 +1,59 @@
+package coupon
+
+import (
+	"crypto/md5"
+	"encoding/binary"
+	"encoding/hex"
+	"math/rand"
+	"strings"
+)
+
+func DisolveCouponCode(code string) (round string, key string) {
+	var final []byte
+	for _, n := range strings.Split(code, "-") {
+		nb, err := hex.DecodeString(n)
+		if err != nil {
+			// 형식 오류
+			return "", ""
+		}
+		final = append(final, nb...)
+	}
+
+	if len(final) != 8 {
+		// 형식 오류
+		return "", ""
+	}
+
+	uid := final[4:]
+	left := binary.BigEndian.Uint16(uid[0:2])
+	right := binary.BigEndian.Uint16(uid[2:4])
+
+	final = final[0:4]
+	xor := binary.LittleEndian.Uint32(final)
+	roundhashnum := xor ^ (uint32(left) * uint32(right))
+
+	roundhash := make([]byte, 4)
+	binary.BigEndian.PutUint32(roundhash, roundhashnum)
+
+	round = hex.EncodeToString(roundhash)
+	key = hex.EncodeToString(uid)
+
+	return
+}
+
+func MakeCouponRoundHash(name string) (hash string, roundNumber uint32) {
+	m5 := md5.New()
+	m5.Write([]byte(name))
+	hashbt := m5.Sum(nil)
+
+	roundbt := make([]byte, 8)
+	copy(roundbt, hashbt[:8])
+
+	roundseed := int64(binary.BigEndian.Uint64(roundbt))
+	roundhash := make([]byte, 4)
+	rand.New(rand.NewSource(roundseed)).Read(roundhash)
+	roundNumber = binary.BigEndian.Uint32(roundhash)
+	hash = hex.EncodeToString(roundhash)
+
+	return
+}

server.go

@@ -73,6 +73,7 @@ func healthCheckHandler(w http.ResponseWriter, r *http.Request) {
 
 	// 한번이라도 들어오면 lb에 붙어있다는 뜻
 	if t := atomic.AddInt64(&healthcheckcounter, 1); t < 0 {
+		logger.Println("healthCheckHandler return StatusServiceUnavailable :", t)
 		w.WriteHeader(http.StatusServiceUnavailable)
 	}
 }
@@ -127,11 +128,25 @@ func (server *Server) shutdown() {
 
 	signal.Stop(server.interrupt)
 
-	if atomic.LoadInt64(&healthcheckcounter) > 0 {
+	if t := atomic.LoadInt64(&healthcheckcounter); t > 0 {
+		logger.Println("http server shutdown. healthcheckcounter :", t)
 		atomic.StoreInt64(&healthcheckcounter, math.MinInt64)
-		for atomic.LoadInt64(&healthcheckcounter)-math.MinInt64 == 0 {
+
+		timer := 600 // 0.1 * 600 = 1분
+		for cnt := 0; cnt < 100 && timer > 0; {
+			next := atomic.LoadInt64(&healthcheckcounter)
+			if next == t {
+				cnt++
+			} else {
+				t = next
+				cnt = 0
+			}
 			time.Sleep(100 * time.Millisecond)
+			timer--
 		}
+		logger.Println("http server shutdown. healthcheck completed")
+	} else {
+		logger.Println("http server shutdown. no lb")
 	}
 
 	if server.httpserver != nil {