69 lines
1.8 KiB
Go
69 lines
1.8 KiB
Go
package writecache
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import (
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objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
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"github.com/nspcc-dev/neofs-node/pkg/core/object"
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"go.etcd.io/bbolt"
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)
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// Get returns object from write-cache.
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func (c *cache) Get(addr *objectSDK.Address) (*object.Object, error) {
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saddr := addr.String()
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c.mtx.RLock()
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for i := range c.mem {
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if saddr == c.mem[i].addr {
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obj := c.mem[i].obj
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c.mtx.RUnlock()
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return obj, nil
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}
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}
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c.mtx.RUnlock()
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var value []byte
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_ = c.db.View(func(tx *bbolt.Tx) error {
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b := tx.Bucket(defaultBucket)
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val := b.Get([]byte(saddr))
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if val != nil {
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value = cloneBytes(val)
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}
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return nil
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})
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if value != nil {
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obj := object.New()
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c.flushed.Get(saddr)
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return obj, obj.Unmarshal(value)
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}
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data, err := c.fsTree.Get(addr)
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if err != nil {
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return nil, object.ErrNotFound
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}
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obj := object.New()
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if err := obj.Unmarshal(data); err != nil {
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return nil, err
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}
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c.flushed.Get(saddr)
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return obj, nil
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}
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// Head returns object header from write-cache.
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func (c *cache) Head(addr *objectSDK.Address) (*object.Object, error) {
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// TODO: easiest to implement solution is presented here, consider more efficient way, e.g.:
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// - provide header as common object.Object to Put, but marked to prevent correlation with full object
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// (all write-cache logic will automatically spread to headers, except flushing)
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// - cut header from in-memory objects directly and persist headers into particular bucket of DB
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// (explicit sync with full objects is needed)
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// - try to pull out binary header from binary full object (not sure if it is possible)
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obj, err := c.Get(addr)
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if err != nil {
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return nil, err
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}
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// NOTE: resetting the payload via the setter can lead to data corruption of in-memory objects, but ok for others
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return object.NewRawFromObject(obj).CutPayload().Object(), nil
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}
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