Make redis cache timeout not trivial.

- Instead of using HASH for all the caches, use HASH + normal KEYs.
- HASH being used as a collection of all KEYs, this is useful when
  application wants to clear all keys.

cache/cache.go

@@ -35,11 +35,11 @@ type Cache interface {
 	Incr(key string) error
 	// decrease cached int value by key, as a counter.
 	Decr(key string) error
-	// check cached value is existed or not.
+	// check if cached value exists or not.
 	IsExist(key string) bool
 	// clear all cache.
 	ClearAll() error
-	// start gc routine via config string setting.
+	// start gc routine based on config string settings.
 	StartAndGC(config string) error
 }
 
@@ -58,13 +58,13 @@ func Register(name string, adapter Cache) {
 	adapters[name] = adapter
 }
 
-// Create a new cache driver by adapter and config string.
+// Create a new cache driver by adapter name and config string.
 // config need to be correct JSON as string: {"interval":360}.
 // it will start gc automatically.
 func NewCache(adapterName, config string) (Cache, error) {
 	adapter, ok := adapters[adapterName]
 	if !ok {
-		return nil, fmt.Errorf("cache: unknown adaptername %q (forgotten import?)", adapterName)
+		return nil, fmt.Errorf("cache: unknown adapter name %q (forgot to import?)", adapterName)
 	}
 	err := adapter.StartAndGC(config)
 	if err != nil {

cache/redis/redis.go

@@ -47,7 +47,7 @@ func (rc *RedisCache) do(commandName string, args ...interface{}) (reply interfa
 
 // Get cache from redis.
 func (rc *RedisCache) Get(key string) interface{} {
-	v, err := rc.do("HGET", rc.key, key)
+	v, err := rc.do("GET", key)
 	if err != nil {
 		return nil
 	}
@@ -56,43 +56,66 @@ func (rc *RedisCache) Get(key string) interface{} {
 }
 
 // put cache to redis.
-// timeout is ignored.
 func (rc *RedisCache) Put(key string, val interface{}, timeout int64) error {
-	_, err := rc.do("HSET", rc.key, key, val)
+	_, err := rc.do("HSET", rc.key, key, true)
+	if err != nil {
+		return nil
+	}
+	_, err = rc.do("SET", key, val)
+	if err != nil {
+		return nil
+	}
+	_, err = rc.do("EXPIRE", key, timeout)
 	return err
 }
 
 // delete cache in redis.
 func (rc *RedisCache) Delete(key string) error {
-	_, err := rc.do("HDEL", rc.key, key)
+        _, err := rc.do("DEL", key)
+	if err != nil {
+		return nil
+	}
+	_, err = rc.do("HDEL", rc.key, key)
 	return err
 }
 
-// check cache exist in redis.
+// check cache's existence in redis.
 func (rc *RedisCache) IsExist(key string) bool {
-	v, err := redis.Bool(rc.do("HEXISTS", rc.key, key))
+	v, err := redis.Bool(rc.do("EXISTS", key))
 	if err != nil {
 		return false
 	}
-
+	if v == false {
+		_, err := rc.do("HDEL", rc.key, key)
+		if err != nil {
+			return false
+		}
+	}
 	return v
 }
 
 // increase counter in redis.
 func (rc *RedisCache) Incr(key string) error {
-	_, err := redis.Bool(rc.do("HINCRBY", rc.key, key, 1))
+	_, err := redis.Bool(rc.do("INCRBY", key, 1))
 	return err
 }
 
 // decrease counter in redis.
 func (rc *RedisCache) Decr(key string) error {
-	_, err := redis.Bool(rc.do("HINCRBY", rc.key, key, -1))
+	_, err := redis.Bool(rc.do("INCRBY", key, -1))
 	return err
 }
 
 // clean all cache in redis. delete this redis collection.
 func (rc *RedisCache) ClearAll() error {
-	_, err := rc.do("DEL", rc.key)
+	cachedKeys, err := redis.Strings(rc.do("HKEYS", rc.key))
+	for _, str := range cachedKeys {
+		_, err := rc.do("DEL", str)
+		if err != nil {
+			return nil
+		}
+	}
+	_, err = rc.do("DEL", rc.key)
 	return err
 }
 

cache/redis/redis_test.go

@@ -0,0 +1,81 @@
+// Beego (http://beego.me/)
+
+// @description beego is an open-source, high-performance web framework for the Go programming language.
+
+// @link        http://github.com/astaxie/beego for the canonical source repository
+
+// @license     http://github.com/astaxie/beego/blob/master/LICENSE
+
+// @authors     astaxie
+
+package cache
+
+import (
+	"testing"
+	"time"
+
+	"github.com/beego/redigo/redis"
+
+	"github.com/astaxie/beego/cache"
+)
+
+func TestRedisCache(t *testing.T) {
+        bm, err := cache.NewCache("redis", `{"conn": "127.0.0.1:6379"}`)
+	if err != nil {
+		t.Error("init err")
+	}
+	if err = bm.Put("astaxie", 1, 10); err != nil {
+		t.Error("set Error", err)
+	}
+	if !bm.IsExist("astaxie") {
+		t.Error("check err")
+	}
+
+	time.Sleep(10 * time.Second)
+
+	if bm.IsExist("astaxie") {
+		t.Error("check err")
+	}
+	if err = bm.Put("astaxie", 1, 10); err != nil {
+		t.Error("set Error", err)
+	}
+
+	if v, _ := redis.Int(bm.Get("astaxie"), err); v != 1 {
+		t.Error("get err")
+	}
+
+	if err = bm.Incr("astaxie"); err != nil {
+		t.Error("Incr Error", err)
+	}
+
+        if v, _ := redis.Int(bm.Get("astaxie"), err); v != 2 {
+		t.Error("get err")
+	}
+
+	if err = bm.Decr("astaxie"); err != nil {
+		t.Error("Decr Error", err)
+	}
+
+	if v, _ := redis.Int(bm.Get("astaxie"), err); v != 1 {
+		t.Error("get err")
+	}
+	bm.Delete("astaxie")
+	if bm.IsExist("astaxie") {
+		t.Error("delete err")
+	}
+	//test string
+	if err = bm.Put("astaxie", "author", 10); err != nil {
+		t.Error("set Error", err)
+	}
+	if !bm.IsExist("astaxie") {
+		t.Error("check err")
+	}
+
+	if v, _ := redis.String(bm.Get("astaxie"), err); v != "author" {
+		t.Error("get err")
+	}
+        // test clear all
+        if err = bm.ClearAll(); err != nil {
+                t.Error("clear all err")
+        }
+}