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package cache
import (
"compress/gzip"
"fmt"
"io"
"github.com/Necoro/feed2imap-go/internal/feed"
)
const v2Version Version = 2
// v2Cache is identical to v1Cache, but uses gzip compression for storage
type v2Cache v1Cache
func newV2Cache() *v2Cache {
return (*v2Cache)(newV1Cache())
}
func (cache *v2Cache) asV1() *v1Cache {
return (*v1Cache)(cache)
}
func (cache *v2Cache) cachedFeed(feed *feed.Feed) CachedFeed {
return cache.asV1().cachedFeed(feed)
}
func (cache *v2Cache) transformTo(v Version) (Impl, error) {
return nil, fmt.Errorf("Transformation not supported")
}
func (cache *v2Cache) cleanup(knownDescriptors map[feed.Descriptor]struct{}) {
cache.asV1().cleanup(knownDescriptors)
}
func (cache *v2Cache) Version() Version {
return v2Version
}
func (cache *v2Cache) Info() string {
return cache.asV1().Info()
}
func (cache *v2Cache) SpecificInfo(i interface{}) string {
return cache.asV1().SpecificInfo(i)
}
func (cache *v2Cache) load(reader io.Reader) error {
gzipReader, err := gzip.NewReader(reader)
if err != nil {
return err
}
defer gzipReader.Close()
return cache.asV1().load(gzipReader)
}
func (cache *v2Cache) store(writer io.Writer) error {
gzipWriter := gzip.NewWriter(writer)
defer gzipWriter.Close()
if err := cache.asV1().store(gzipWriter); err != nil {
return err
}
return gzipWriter.Flush()
}
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