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memcached_storage.go
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memcached_storage.go
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package remotecache
import (
"time"
"github.com/bradfitz/gomemcache/memcache"
"github.com/grafana/grafana/pkg/setting"
)
const memcachedCacheType = "memcached"
type memcachedStorage struct {
c *memcache.Client
}
func newMemcachedStorage(opts *setting.RemoteCacheOptions) *memcachedStorage {
return &memcachedStorage{
c: memcache.New(opts.ConnStr),
}
}
func newItem(sid string, data []byte, expire int32) *memcache.Item {
return &memcache.Item{
Key: sid,
Value: data,
Expiration: expire,
}
}
// Set sets value to given key in the cache.
func (s *memcachedStorage) Set(key string, val interface{}, expires time.Duration) error {
item := &cachedItem{Val: val}
bytes, err := encodeGob(item)
if err != nil {
return err
}
var expiresInSeconds int64
if expires != 0 {
expiresInSeconds = int64(expires) / int64(time.Second)
}
memcachedItem := newItem(key, bytes, int32(expiresInSeconds))
return s.c.Set(memcachedItem)
}
// Get gets value by given key in the cache.
func (s *memcachedStorage) Get(key string) (interface{}, error) {
memcachedItem, err := s.c.Get(key)
if err != nil && err.Error() == "memcache: cache miss" {
return nil, ErrCacheItemNotFound
}
if err != nil {
return nil, err
}
item := &cachedItem{}
err = decodeGob(memcachedItem.Value, item)
if err != nil {
return nil, err
}
return item.Val, nil
}
// Delete delete a key from the cache
func (s *memcachedStorage) Delete(key string) error {
return s.c.Delete(key)
}