frostfs-node/pkg/local_object_storage/engine/range.go

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package engine
import (
"errors"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/shard"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"go.uber.org/zap"
)
// RngPrm groups the parameters of GetRange operation.
type RngPrm struct {
off, ln uint64
addr oid.Address
}
// RngRes groups the resulting values of GetRange operation.
type RngRes struct {
obj *objectSDK.Object
}
// WithAddress is a GetRng option to set the address of the requested object.
//
// Option is required.
func (p *RngPrm) WithAddress(addr oid.Address) {
p.addr = addr
}
// WithPayloadRange is a GetRange option to set range of requested payload data.
//
// Missing an option or calling with zero length is equivalent
// to getting the full payload range.
func (p *RngPrm) WithPayloadRange(rng *objectSDK.Range) {
p.off, p.ln = rng.GetOffset(), rng.GetLength()
}
// Object returns the requested object part.
//
// Instance payload contains the requested range of the original object.
func (r RngRes) Object() *objectSDK.Object {
return r.obj
}
// GetRange reads part of an object from local storage.
//
// Returns any error encountered that
// did not allow to completely read the object part.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in local storage.
// Returns an error of type apistatus.ObjectAlreadyRemoved if the requested object is inhumed.
// Returns ErrRangeOutOfBounds if the requested object range is out of bounds.
//
// Returns an error if executions are blocked (see BlockExecution).
func (e *StorageEngine) GetRange(prm RngPrm) (res RngRes, err error) {
err = e.execIfNotBlocked(func() error {
res, err = e.getRange(prm)
return err
})
return
}
func (e *StorageEngine) getRange(prm RngPrm) (RngRes, error) {
if e.metrics != nil {
defer elapsed(e.metrics.AddRangeDuration)()
}
var errNotFound apistatus.ObjectNotFound
var shPrm shard.RngPrm
shPrm.SetAddress(prm.addr)
shPrm.SetRange(prm.off, prm.ln)
it := &getRangeShardIterator{
OutError: errNotFound,
ShardPrm: shPrm,
Address: prm.addr,
Engine: e,
}
it.tryGetWithMeta()
if it.SplitInfo != nil {
return RngRes{}, logicerr.Wrap(objectSDK.NewSplitInfoError(it.SplitInfo))
}
if it.Object == nil {
// If any shard is in a degraded mode, we should assume that metabase could store
// info about some object.
if it.ShardWithMeta.Shard == nil && !it.HasDegraded || !shard.IsErrNotFound(it.OutError) {
return RngRes{}, it.OutError
}
it.tryGetFromBlobstor()
if it.Object == nil {
return RngRes{}, it.OutError
}
if it.ShardWithMeta.Shard != nil {
e.reportShardError(it.ShardWithMeta, "meta info was present, but object is missing",
it.MetaError,
zap.Stringer("address", prm.addr))
}
}
return RngRes{
obj: it.Object,
}, nil
}
// GetRange reads object payload range from local storage by provided address.
func GetRange(storage *StorageEngine, addr oid.Address, rng *objectSDK.Range) ([]byte, error) {
var rangePrm RngPrm
rangePrm.WithAddress(addr)
rangePrm.WithPayloadRange(rng)
res, err := storage.GetRange(rangePrm)
if err != nil {
return nil, err
}
return res.Object().Payload(), nil
}
type getRangeShardIterator struct {
Object *objectSDK.Object
SplitInfoError *objectSDK.SplitInfoError
SplitInfo *objectSDK.SplitInfo
OutError error
ShardWithMeta hashedShard
MetaError error
HasDegraded bool
ShardPrm shard.RngPrm
Address oid.Address
Engine *StorageEngine
}
func (i *getRangeShardIterator) tryGetWithMeta() {
i.Engine.iterateOverSortedShards(i.Address, func(_ int, sh hashedShard) (stop bool) {
noMeta := sh.GetMode().NoMetabase()
i.HasDegraded = i.HasDegraded || noMeta
i.ShardPrm.SetIgnoreMeta(noMeta)
res, err := sh.GetRange(i.ShardPrm)
if err == nil {
i.Object = res.Object()
return true
}
if res.HasMeta() {
i.ShardWithMeta = sh
i.MetaError = err
}
switch {
case shard.IsErrNotFound(err):
return false // ignore, go to next shard
case errors.As(err, &i.SplitInfoError):
if i.SplitInfo == nil {
i.SplitInfo = objectSDK.NewSplitInfo()
}
util.MergeSplitInfo(i.SplitInfoError.SplitInfo(), i.SplitInfo)
_, withLink := i.SplitInfo.Link()
_, withLast := i.SplitInfo.LastPart()
// stop iterating over shards if SplitInfo structure is complete
return withLink && withLast
case
shard.IsErrRemoved(err),
shard.IsErrOutOfRange(err):
i.OutError = err
return true // stop, return it back
default:
i.Engine.reportShardError(sh, "could not get object from shard", err)
return false
}
})
}
func (i *getRangeShardIterator) tryGetFromBlobstor() {
// If the object is not found but is present in metabase,
// try to fetch it from blobstor directly. If it is found in any
// blobstor, increase the error counter for the shard which contains the meta.
i.ShardPrm.SetIgnoreMeta(true)
i.Engine.iterateOverSortedShards(i.Address, func(_ int, sh hashedShard) (stop bool) {
if sh.GetMode().NoMetabase() {
// Already processed it without a metabase.
return false
}
res, err := sh.GetRange(i.ShardPrm)
if shard.IsErrOutOfRange(err) {
var errOutOfRange apistatus.ObjectOutOfRange
i.OutError = errOutOfRange
return true
}
i.Object = res.Object()
return err == nil
})
}