forked from TrueCloudLab/frostfs-node
93 lines
2.4 KiB
Go
93 lines
2.4 KiB
Go
package tombstone
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import (
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"context"
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"strconv"
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lru "github.com/hashicorp/golang-lru"
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objectV2 "github.com/nspcc-dev/neofs-api-go/v2/object"
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"github.com/nspcc-dev/neofs-sdk-go/object"
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oid "github.com/nspcc-dev/neofs-sdk-go/object/id"
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"go.uber.org/zap"
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)
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// Source is a tombstone source interface.
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type Source interface {
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// Tombstone must return tombstone from the source it was
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// configured to fetch from and any error that appeared during
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// fetching process.
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//
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// Tombstone MUST return (nil, nil) if requested tombstone is
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// missing in the storage for the provided epoch.
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Tombstone(ctx context.Context, a oid.Address, epoch uint64) (*object.Object, error)
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}
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// ExpirationChecker is a tombstone source wrapper.
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// It checks tombstones presence via tombstone
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// source, caches it checks its expiration.
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//
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// Must be created via NewChecker function. `var` and
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// `ExpirationChecker{}` declarations leads to undefined behaviour
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// and may lead to panics.
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type ExpirationChecker struct {
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cache *lru.Cache
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log *zap.Logger
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tsSource Source
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}
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// IsTombstoneAvailable checks the tombstone presence in the system in the
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// following order:
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// - 1. Local LRU cache;
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// - 2. Tombstone source.
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//
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// If a tombstone was successfully fetched (regardless of its expiration)
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// it is cached in the LRU cache.
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func (g *ExpirationChecker) IsTombstoneAvailable(ctx context.Context, a oid.Address, epoch uint64) bool {
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addrStr := a.EncodeToString()
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log := g.log.With(zap.String("address", addrStr))
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expEpoch, ok := g.cache.Get(addrStr)
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if ok {
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return expEpoch.(uint64) > epoch
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}
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ts, err := g.tsSource.Tombstone(ctx, a, epoch)
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if err != nil {
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log.Warn(
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"tombstone getter: could not get the tombstone the source",
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zap.Error(err),
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)
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} else {
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if ts != nil {
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return g.handleTS(addrStr, ts, epoch)
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}
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}
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// requested tombstone not
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// found in the NeoFS network
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return false
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}
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func (g *ExpirationChecker) handleTS(addr string, ts *object.Object, reqEpoch uint64) bool {
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for _, atr := range ts.Attributes() {
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if atr.Key() == objectV2.SysAttributeExpEpoch {
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epoch, err := strconv.ParseUint(atr.Value(), 10, 64)
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if err != nil {
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g.log.Warn(
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"tombstone getter: could not parse tombstone expiration epoch",
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zap.Error(err),
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)
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return false
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}
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g.cache.Add(addr, epoch)
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return epoch > reqEpoch
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}
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}
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// unexpected tombstone without expiration epoch
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return false
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}
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