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facade.go
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facade.go
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package chunkenc
import (
"io"
"github.com/cortexproject/cortex/pkg/chunk/encoding"
)
// GzipLogChunk is a cortex encoding type for our chunks.
const GzipLogChunk = encoding.Encoding(128)
func init() {
encoding.MustRegisterEncoding(GzipLogChunk, "GzipLogChunk", func() encoding.Chunk {
return &Facade{
c: NewMemChunk(EncGZIP),
}
})
}
// Facade for compatibility with cortex chunk type, so we can use its chunk store.
type Facade struct {
c Chunk
encoding.Chunk
}
// NewFacade makes a new Facade.
func NewFacade(c Chunk) encoding.Chunk {
return &Facade{
c: c,
}
}
// Marshal implements encoding.Chunk.
func (f Facade) Marshal(w io.Writer) error {
buf, err := f.c.Bytes()
if err != nil {
return err
}
_, err = w.Write(buf)
return err
}
// UnmarshalFromBuf implements encoding.Chunk.
func (f *Facade) UnmarshalFromBuf(buf []byte) error {
var err error
f.c, err = NewByteChunk(buf)
return err
}
// Encoding implements encoding.Chunk.
func (Facade) Encoding() encoding.Encoding {
return GzipLogChunk
}
// LokiChunk returns the chunkenc.Chunk.
func (f Facade) LokiChunk() Chunk {
return f.c
}