func Restore(blobpath string, c btncrypt.Cipher, bs blobstore.BlobStore, cb DecodeCallback) error {
r, err := bs.OpenReader(blobpath)
if err != nil {
return err
}
cr, err := chunkstore.NewChunkReader(r, c)
if err != nil {
return err
}
logger.Debugf(mylog, "serialized blob size: %d", cr.Length())
zr, err := zlib.NewReader(&io.LimitedReader{cr, int64(cr.Length())})
if err != nil {
return err
}
logger.Debugf(mylog, "statesnapshot.Restore: zlib init success!")
dec := gob.NewDecoder(zr)
es := []error{}
if err := cb(dec); err != nil {
es = append(es, fmt.Errorf("Failed to decode state: %v", err))
}
if err := zr.Close(); err != nil {
es = append(es, fmt.Errorf("Failed to close zlib Reader: %v", err))
}
if err := r.Close(); err != nil {
es = append(es, fmt.Errorf("Failed to close BlobHandle: %v", err))
}
if err := util.ToErrors(es); err != nil {
return err
}
return nil
}
func WriteVersionedBlob(bs blobstore.BlobStore, blobpath string, version byte) error {
w, err := bs.OpenWriter(blobpath)
if err != nil {
return fmt.Errorf("Failed to open writer: %v", err)
}
if _, err := w.Write([]byte{version}); err != nil {
return fmt.Errorf("Failed to blob write: %v", err)
}
if err := w.Close(); err != nil {
return fmt.Errorf("Failed to close writer: %v", err)
}
return nil
}
func Save(blobpath string, c btncrypt.Cipher, bs blobstore.BlobStore, cb EncodeCallback) error {
var buf bytes.Buffer
zw := zlib.NewWriter(&buf)
enc := gob.NewEncoder(zw)
es := []error{}
if err := cb(enc); err != nil {
es = append(es, fmt.Errorf("Failed to encode state: %v", err))
}
if err := zw.Close(); err != nil {
es = append(es, fmt.Errorf("Failed to close zlib Writer: %v", err))
}
if err := util.ToErrors(es); err != nil {
return err
}
w, err := bs.OpenWriter(blobpath)
if err != nil {
return err
}
cw, err := chunkstore.NewChunkWriter(w, c, chunkstore.ChunkHeader{
PayloadLen: uint32(buf.Len()),
PayloadVersion: 1,
OrigFilename: blobpath,
OrigOffset: 0,
})
if err != nil {
return err
}
if _, err := cw.Write(buf.Bytes()); err != nil {
es = append(es, fmt.Errorf("Failed to write to ChunkWriter: %v", err))
}
if err := cw.Close(); err != nil {
es = append(es, fmt.Errorf("Failed to close ChunkWriter: %v", err))
}
if err := w.Close(); err != nil {
es = append(es, fmt.Errorf("Failed to close blobhandle: %v", err))
}
if err := util.ToErrors(es); err != nil {
return err
}
return nil
}
func AssertBlobVersion(bs blobstore.BlobStore, blobpath string, expected version.Version) error {
r, err := bs.OpenReader(blobpath)
if err != nil {
if expected == 0 && os.IsNotExist(err) {
return nil
}
return fmt.Errorf("Failed to open reader: %v", err)
}
actual, err := TestQueryVersion(r)
if err != nil {
return fmt.Errorf("Failed to query version: %v", err)
}
if err := r.Close(); err != nil {
return fmt.Errorf("Failed to close reader: %v", err)
}
if actual != expected {
return fmt.Errorf("Expected version %d, but got %d", expected, actual)
}
return nil
}