replace zxq.co/ripple/hanayo

vendor/github.com/gin-gonic/contrib/cache/redis.go

@@ -0,0 +1,181 @@
+package cache
+
+import (
+	"github.com/garyburd/redigo/redis"
+	"time"
+)
+
+// Wraps the Redis client to meet the Cache interface.
+type RedisStore struct {
+	pool              *redis.Pool
+	defaultExpiration time.Duration
+}
+
+// until redigo supports sharding/clustering, only one host will be in hostList
+func NewRedisCache(host string, password string, defaultExpiration time.Duration) *RedisStore {
+	var pool = &redis.Pool{
+		MaxIdle:     5,
+		IdleTimeout: 240 * time.Second,
+		Dial: func() (redis.Conn, error) {
+			// the redis protocol should probably be made sett-able
+			c, err := redis.Dial("tcp", host)
+			if err != nil {
+				return nil, err
+			}
+			if len(password) > 0 {
+				if _, err := c.Do("AUTH", password); err != nil {
+					c.Close()
+					return nil, err
+				}
+			} else {
+				// check with PING
+				if _, err := c.Do("PING"); err != nil {
+					c.Close()
+					return nil, err
+				}
+			}
+			return c, err
+		},
+		// custom connection test method
+		TestOnBorrow: func(c redis.Conn, t time.Time) error {
+			if _, err := c.Do("PING"); err != nil {
+				return err
+			}
+			return nil
+		},
+	}
+	return &RedisStore{pool, defaultExpiration}
+}
+
+func (c *RedisStore) Set(key string, value interface{}, expires time.Duration) error {
+	return c.invoke(c.pool.Get().Do, key, value, expires)
+}
+
+func (c *RedisStore) Add(key string, value interface{}, expires time.Duration) error {
+	conn := c.pool.Get()
+	if exists(conn, key) {
+		return ErrNotStored
+	}
+	return c.invoke(conn.Do, key, value, expires)
+}
+
+func (c *RedisStore) Replace(key string, value interface{}, expires time.Duration) error {
+	conn := c.pool.Get()
+	if !exists(conn, key) {
+		return ErrNotStored
+	}
+	err := c.invoke(conn.Do, key, value, expires)
+	if value == nil {
+		return ErrNotStored
+	} else {
+		return err
+	}
+}
+
+func (c *RedisStore) Get(key string, ptrValue interface{}) error {
+	conn := c.pool.Get()
+	defer conn.Close()
+	raw, err := conn.Do("GET", key)
+	if raw == nil {
+		return ErrCacheMiss
+	}
+	item, err := redis.Bytes(raw, err)
+	if err != nil {
+		return err
+	}
+	return deserialize(item, ptrValue)
+}
+
+func exists(conn redis.Conn, key string) bool {
+	retval, _ := redis.Bool(conn.Do("EXISTS", key))
+	return retval
+}
+
+func (c *RedisStore) Delete(key string) error {
+	conn := c.pool.Get()
+	defer conn.Close()
+	if !exists(conn, key) {
+		return ErrCacheMiss
+	}
+	_, err := conn.Do("DEL", key)
+	return err
+}
+
+func (c *RedisStore) Increment(key string, delta uint64) (uint64, error) {
+	conn := c.pool.Get()
+	defer conn.Close()
+	// Check for existance *before* increment as per the cache contract.
+	// redis will auto create the key, and we don't want that. Since we need to do increment
+	// ourselves instead of natively via INCRBY (redis doesn't support wrapping), we get the value
+	// and do the exists check this way to minimize calls to Redis
+	val, err := conn.Do("GET", key)
+	if val == nil {
+		return 0, ErrCacheMiss
+	}
+	if err == nil {
+		currentVal, err := redis.Int64(val, nil)
+		if err != nil {
+			return 0, err
+		}
+		var sum int64 = currentVal + int64(delta)
+		_, err = conn.Do("SET", key, sum)
+		if err != nil {
+			return 0, err
+		}
+		return uint64(sum), nil
+	} else {
+		return 0, err
+	}
+}
+
+func (c *RedisStore) Decrement(key string, delta uint64) (newValue uint64, err error) {
+	conn := c.pool.Get()
+	defer conn.Close()
+	// Check for existance *before* increment as per the cache contract.
+	// redis will auto create the key, and we don't want that, hence the exists call
+	if !exists(conn, key) {
+		return 0, ErrCacheMiss
+	}
+	// Decrement contract says you can only go to 0
+	// so we go fetch the value and if the delta is greater than the amount,
+	// 0 out the value
+	currentVal, err := redis.Int64(conn.Do("GET", key))
+	if err == nil && delta > uint64(currentVal) {
+		tempint, err := redis.Int64(conn.Do("DECRBY", key, currentVal))
+		return uint64(tempint), err
+	}
+	tempint, err := redis.Int64(conn.Do("DECRBY", key, delta))
+	return uint64(tempint), err
+}
+
+func (c *RedisStore) Flush() error {
+	conn := c.pool.Get()
+	defer conn.Close()
+	_, err := conn.Do("FLUSHALL")
+	return err
+}
+
+func (c *RedisStore) invoke(f func(string, ...interface{}) (interface{}, error),
+	key string, value interface{}, expires time.Duration) error {
+
+	switch expires {
+	case DEFAULT:
+		expires = c.defaultExpiration
+	case FOREVER:
+		expires = time.Duration(0)
+	}
+
+	b, err := serialize(value)
+	if err != nil {
+		return err
+	}
+	conn := c.pool.Get()
+	defer conn.Close()
+	if expires > 0 {
+		_, err := f("SETEX", key, int32(expires/time.Second), b)
+		return err
+	} else {
+		_, err := f("SET", key, b)
+		return err
+	}
+}