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920341cb68
This is done by protecting newly added cache items from being swept for X amount of time where X defaults to: * `metadata` - 24 hours (new) * `data` - 10 min (new) * `indexes` - 1 hours (same as today) Fixes #1540
57 lines
1.5 KiB
Go
57 lines
1.5 KiB
Go
package content
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import (
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"context"
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"github.com/pkg/errors"
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"github.com/kopia/kopia/internal/cache"
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"github.com/kopia/kopia/internal/gather"
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"github.com/kopia/kopia/repo/blob"
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)
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type contentCacheForData struct {
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pc *cache.PersistentCache
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st blob.Storage
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}
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func adjustCacheKey(cacheKey cacheKey) cacheKey {
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// content IDs with odd length have a single-byte prefix.
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// move the prefix to the end of cache key to make sure the top level shard is spread 256 ways.
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if len(cacheKey)%2 == 1 {
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return cacheKey[1:] + cacheKey[0:1]
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}
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return cacheKey
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}
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func (c *contentCacheForData) getContent(ctx context.Context, cacheKey cacheKey, blobID blob.ID, offset, length int64, output *gather.WriteBuffer) error {
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cacheKey = adjustCacheKey(cacheKey)
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// nolint:wrapcheck
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return c.pc.GetOrLoad(ctx, string(cacheKey), func(output *gather.WriteBuffer) error {
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// nolint:wrapcheck
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return c.st.GetBlob(ctx, blobID, offset, length, output)
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}, output)
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}
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func (c *contentCacheForData) close(ctx context.Context) {
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c.pc.Close(ctx)
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}
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func newContentCacheForData(ctx context.Context, st blob.Storage, cacheStorage cache.Storage, sweep cache.SweepSettings, hmacSecret []byte) (contentCache, error) {
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if cacheStorage == nil {
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return passthroughContentCache{st}, nil
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}
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pc, err := cache.NewPersistentCache(ctx, "content cache", cacheStorage, cache.ChecksumProtection(hmacSecret), sweep)
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if err != nil {
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return nil, errors.Wrap(err, "unable to create base cache")
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}
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return &contentCacheForData{
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st: st,
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pc: pc,
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}, nil
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}
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