318639e5bf
`apistatus` package provides types which implement build-in `error` interface. Add `error of type` pattern when documenting these errors in order to clarify how these errors should be handled (e.g. `errors.Is` is not good). Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
89 lines
2.5 KiB
Go
89 lines
2.5 KiB
Go
package writecache
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import (
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apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
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objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
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addressSDK "github.com/nspcc-dev/neofs-sdk-go/object/address"
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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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//
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// Returns an error of type apistatus.ObjectNotFound if requested object is missing in write-cache.
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func (c *cache) Get(addr *addressSDK.Address) (*objectSDK.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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value, err := Get(c.db, []byte(saddr))
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if err == nil {
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obj := objectSDK.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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var errNotFound apistatus.ObjectNotFound
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return nil, errNotFound
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}
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obj := objectSDK.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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//
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// Returns an error of type apistatus.ObjectNotFound if requested object is missing in write-cache.
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func (c *cache) Head(addr *addressSDK.Address) (*objectSDK.Object, error) {
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// TODO: #1149 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 obj.CutPayload(), nil
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}
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// Get fetches object from the underlying database.
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// Key should be a stringified address.
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//
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// Returns an error of type apistatus.ObjectNotFound if requested object is missing in db.
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func Get(db *bbolt.DB, key []byte) ([]byte, error) {
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var value []byte
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err := db.View(func(tx *bbolt.Tx) error {
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b := tx.Bucket(defaultBucket)
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if b == nil {
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return ErrNoDefaultBucket
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}
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value = b.Get(key)
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if value == nil {
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var errNotFound apistatus.ObjectNotFound
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return errNotFound
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}
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value = cloneBytes(value)
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return nil
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})
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return value, err
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}
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