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// Package leveldbcache provides an implementation of httpcache.Cache that
// uses github.com/syndtr/goleveldb/leveldb
package leveldbcache
import (
"github.com/syndtr/goleveldb/leveldb"
)
// Cache is an implementation of httpcache.Cache with leveldb storage
type Cache struct {
db *leveldb.DB
}
// Get returns the response corresponding to key if present
func (c *Cache) Get(key string) (resp []byte, ok bool) {
var err error
resp, err = c.db.Get([]byte(key), nil)
if err != nil {
return []byte{}, false
}
return resp, true
}
// Set saves a response to the cache as key
func (c *Cache) Set(key string, resp []byte) {
c.db.Put([]byte(key), resp, nil)
}
// Delete removes the response with key from the cache
func (c *Cache) Delete(key string) {
c.db.Delete([]byte(key), nil)
}
// New returns a new Cache that will store leveldb in path
func New(path string) (*Cache, error) {
cache := &Cache{}
var err error
cache.db, err = leveldb.OpenFile(path, nil)
if err != nil {
return nil, err
}
return cache, nil
}
// NewWithDB returns a new Cache using the provided leveldb as underlying
// storage.
func NewWithDB(db *leveldb.DB) *Cache {
return &Cache{db}
}
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