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out-of-tree/distro/debian/cache.go

54 lines
923 B
Go

package debian
import (
"errors"
"sync"
"github.com/rapidloop/skv"
)
type Cache struct {
store *skv.KVStore
}
// cache is not thread-safe, so make sure there are only one user
var mu sync.Mutex
func NewCache(path string) (c *Cache, err error) {
mu.Lock()
c = &Cache{}
c.store, err = skv.Open(path)
return
}
func (c Cache) Put(p []DebianKernel) error {
if len(p) == 0 {
return errors.New("empty slice")
}
return c.store.Put(p[0].Version.Package, p)
}
func (c Cache) Get(version string) (p []DebianKernel, err error) {
err = c.store.Get(version, &p)
if len(p) == 0 {
err = skv.ErrNotFound
}
return
}
func (c Cache) PutVersions(versions []string) error {
return c.store.Put("versions", versions)
}
func (c Cache) GetVersions() (versions []string, err error) {
err = c.store.Get("versions", &versions)
return
}
func (c Cache) Close() (err error) {
err = c.store.Close()
mu.Unlock()
return
}