forked from TrueCloudLab/frostfs-node
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
|
|
|
|
import (
|
|
apistatus "github.com/nspcc-dev/neofs-sdk-go/client/status"
|
|
objectSDK "github.com/nspcc-dev/neofs-sdk-go/object"
|
|
addressSDK "github.com/nspcc-dev/neofs-sdk-go/object/address"
|
|
"go.etcd.io/bbolt"
|
|
)
|
|
|
|
// Get returns object from write-cache.
|
|
//
|
|
// Returns an error of type apistatus.ObjectNotFound if requested object is missing in write-cache.
|
|
func (c *cache) Get(addr *addressSDK.Address) (*objectSDK.Object, error) {
|
|
saddr := addr.String()
|
|
|
|
c.mtx.RLock()
|
|
for i := range c.mem {
|
|
if saddr == c.mem[i].addr {
|
|
obj := c.mem[i].obj
|
|
c.mtx.RUnlock()
|
|
return obj, nil
|
|
}
|
|
}
|
|
c.mtx.RUnlock()
|
|
|
|
value, err := Get(c.db, []byte(saddr))
|
|
if err == nil {
|
|
obj := objectSDK.New()
|
|
c.flushed.Get(saddr)
|
|
return obj, obj.Unmarshal(value)
|
|
}
|
|
|
|
data, err := c.fsTree.Get(addr)
|
|
if err != nil {
|
|
var errNotFound apistatus.ObjectNotFound
|
|
|
|
return nil, errNotFound
|
|
}
|
|
|
|
obj := objectSDK.New()
|
|
if err := obj.Unmarshal(data); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
c.flushed.Get(saddr)
|
|
return obj, nil
|
|
}
|
|
|
|
// Head returns object header from write-cache.
|
|
//
|
|
// Returns an error of type apistatus.ObjectNotFound if requested object is missing in write-cache.
|
|
func (c *cache) Head(addr *addressSDK.Address) (*objectSDK.Object, error) {
|
|
// TODO: #1149 easiest to implement solution is presented here, consider more efficient way, e.g.:
|
|
// - provide header as common object.Object to Put, but marked to prevent correlation with full object
|
|
// (all write-cache logic will automatically spread to headers, except flushing)
|
|
// - cut header from in-memory objects directly and persist headers into particular bucket of DB
|
|
// (explicit sync with full objects is needed)
|
|
// - try to pull out binary header from binary full object (not sure if it is possible)
|
|
obj, err := c.Get(addr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
// NOTE: resetting the payload via the setter can lead to data corruption of in-memory objects, but ok for others
|
|
return obj.CutPayload(), nil
|
|
}
|
|
|
|
// Get fetches object from the underlying database.
|
|
// Key should be a stringified address.
|
|
//
|
|
// Returns an error of type apistatus.ObjectNotFound if requested object is missing in db.
|
|
func Get(db *bbolt.DB, key []byte) ([]byte, error) {
|
|
var value []byte
|
|
err := db.View(func(tx *bbolt.Tx) error {
|
|
b := tx.Bucket(defaultBucket)
|
|
if b == nil {
|
|
return ErrNoDefaultBucket
|
|
}
|
|
value = b.Get(key)
|
|
if value == nil {
|
|
var errNotFound apistatus.ObjectNotFound
|
|
|
|
return errNotFound
|
|
}
|
|
value = cloneBytes(value)
|
|
return nil
|
|
})
|
|
return value, err
|
|
}
|