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Snapshot takes an io.Writer and writes the entire backend data to the given writer. Snapshot writes a consistent view and does not block other storage operations. Restore restores the in-memory states (index and book keeping) of the storage from the backend data.
26 lines
497 B
Go
26 lines
497 B
Go
package storage
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import "encoding/binary"
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type reversion struct {
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main int64
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sub int64
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}
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func newRevBytes() []byte {
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return make([]byte, 8+1+8)
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}
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func revToBytes(rev reversion, bytes []byte) {
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binary.BigEndian.PutUint64(bytes, uint64(rev.main))
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bytes[8] = '_'
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binary.BigEndian.PutUint64(bytes[9:], uint64(rev.sub))
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}
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func bytesToRev(bytes []byte) reversion {
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return reversion{
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main: int64(binary.BigEndian.Uint64(bytes[0:8])),
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sub: int64(binary.BigEndian.Uint64(bytes[9:])),
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}
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}
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