Add sync => go-sync

sync/lock/redis/pool.go

@@ -0,0 +1,29 @@
+package redis
+
+import (
+	"sync"
+
+	"github.com/gomodule/redigo/redis"
+)
+
+type pool struct {
+	sync.Mutex
+	i     int
+	addrs []string
+}
+
+func (p *pool) Get() redis.Conn {
+	for i := 0; i < 3; i++ {
+		p.Lock()
+		addr := p.addrs[p.i%len(p.addrs)]
+		p.i++
+		p.Unlock()
+
+		c, err := redis.Dial("tcp", addr)
+		if err != nil {
+			continue
+		}
+		return c
+	}
+	return nil
+}