feat: Restore zstd-compressed database backup #273
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dlipovetsky
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I removed an unused function, and force-pushed. |
The database backup is compressed using zstd. This allows us to load the backup without having to decompress it beforehand.
dlipovetsky
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dlipovetsky
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Apr 22, 2024
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| err = db.Load(zr, runtime.NumCPU()) | ||
| if errors.Is(err, zstd.ErrMagicMismatch) { | ||
| glog.V(2).Infof("database file is not compressed with zstd, will load without decompressing") | ||
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| // We already loaded the database, advancing the file offset. To load the database again, | ||
| // we must reset the offset to the start. | ||
| if _, err := file.Seek(0, io.SeekStart); err != nil { | ||
| return errors.Wrapf(err, "failed to to rewind to start of database restore file: %q", filename) | ||
| } | ||
| err = db.Load(file, runtime.NumCPU()) | ||
| } | ||
| if err != nil { |
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I wanted to check if the file is compressed or not before loading the database, but could not find a way to do that using the zstd package. Attempting to load the database is the best alternative I found.
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CI failure appears to be unrelated to this change. |
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The database backup is compressed using zstd. This allows us to load the backup without having to decompress it beforehand.
Please note that this change is backward compatible: both compressed and uncompressed backups are supported. I have added an integration test (using an on-disk database) to ensure this.