frostfs-node/pkg/local_object_storage/writecache/writecache.go

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package writecache
import (
"context"
"errors"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/compression"
meta "git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/metabase"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard/mode"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
)
// Info groups the information about write-cache.
type Info struct {
// Full path to the write-cache.
Path string
}
// Cache represents write-cache for objects.
type Cache interface {
Get(ctx context.Context, address oid.Address) (*objectSDK.Object, error)
Head(context.Context, oid.Address) (*objectSDK.Object, error)
// Delete removes object referenced by the given oid.Address from the
// Cache. Returns any error encountered that prevented the object to be
// removed.
//
// Returns apistatus.ObjectNotFound if object is missing in the Cache.
// Returns ErrReadOnly if the Cache is currently in the read-only mode.
Delete(context.Context, oid.Address) error
Put(context.Context, common.PutPrm) (common.PutRes, error)
SetMode(mode.Mode) error
SetLogger(*logger.Logger)
DumpInfo() Info
Flush(context.Context, bool) error
Init() error
Open(ctx context.Context, readOnly bool) error
Close() error
}
// MainStorage is the interface of the underlying storage of Cache implementations.
type MainStorage interface {
Compressor() *compression.Config
Exists(context.Context, common.ExistsPrm) (common.ExistsRes, error)
Put(context.Context, common.PutPrm) (common.PutRes, error)
}
// Metabase is the interface of the metabase used by Cache implementations.
type Metabase interface {
UpdateStorageID(context.Context, meta.UpdateStorageIDPrm) (meta.UpdateStorageIDRes, error)
}
var (
// ErrReadOnly is returned when Put/Write is performed in a read-only mode.
ErrReadOnly = logicerr.New("write-cache is in read-only mode")
// ErrNotInitialized is returned when write-cache is initializing.
ErrNotInitialized = logicerr.New("write-cache is not initialized yet")
// ErrBigObject is returned when object is too big to be placed in cache.
ErrBigObject = errors.New("too big object")
// ErrOutOfSpace is returned when there is no space left to put a new object.
ErrOutOfSpace = errors.New("no space left in the write cache")
)