frostfs-node/pkg/local_object_storage/engine/head.go
Evgenii Stratonikov 71b87155ef [] *: use stdlib errors package
Signed-off-by: Evgenii Stratonikov <evgeniy@nspcc.ru>
2021-05-19 16:42:54 +03:00

156 lines
3.5 KiB
Go

package engine
import (
"errors"
objectSDK "github.com/nspcc-dev/neofs-api-go/pkg/object"
"github.com/nspcc-dev/neofs-node/pkg/core/object"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/shard"
"github.com/nspcc-dev/neofs-node/pkg/local_object_storage/util"
"go.uber.org/zap"
)
// HeadPrm groups the parameters of Head operation.
type HeadPrm struct {
addr *objectSDK.Address
raw bool
}
// HeadRes groups resulting values of Head operation.
type HeadRes struct {
head *object.Object
}
// WithAddress is a Head option to set the address of the requested object.
//
// Option is required.
func (p *HeadPrm) WithAddress(addr *objectSDK.Address) *HeadPrm {
if p != nil {
p.addr = addr
}
return p
}
// WithRaw is a Head option to set raw flag value. If flag is unset, then Head
// returns header of virtual object, otherwise it returns SplitInfo of virtual
// object.
func (p *HeadPrm) WithRaw(raw bool) *HeadPrm {
if p != nil {
p.raw = raw
}
return p
}
// Header returns the requested object header.
//
// Instance has empty payload.
func (r *HeadRes) Header() *object.Object {
return r.head
}
// Head reads object header from local storage.
//
// Returns any error encountered that
// did not allow to completely read the object header.
//
// Returns object.ErrNotFound if requested object is missing in local storage.
// Returns object.ErrAlreadyRemoved if requested object was inhumed.
func (e *StorageEngine) Head(prm *HeadPrm) (*HeadRes, error) {
if e.metrics != nil {
defer elapsed(e.metrics.AddHeadDuration)()
}
var (
head *object.Object
siErr *objectSDK.SplitInfoError
outSI *objectSDK.SplitInfo
outError = object.ErrNotFound
)
shPrm := new(shard.HeadPrm).
WithAddress(prm.addr).
WithRaw(prm.raw)
e.iterateOverSortedShards(prm.addr, func(_ int, sh *shard.Shard) (stop bool) {
res, err := sh.Head(shPrm)
if err != nil {
switch {
case errors.Is(err, object.ErrNotFound):
return false // ignore, go to next shard
case errors.As(err, &siErr):
siErr = err.(*objectSDK.SplitInfoError)
if outSI == nil {
outSI = objectSDK.NewSplitInfo()
}
util.MergeSplitInfo(siErr.SplitInfo(), outSI)
// stop iterating over shards if SplitInfo structure is complete
if outSI.Link() != nil && outSI.LastPart() != nil {
return true
}
return false
case errors.Is(err, object.ErrAlreadyRemoved):
outError = err
return true // stop, return it back
default:
// TODO: smth wrong with shard, need to be processed, but
// still go to next shard
e.log.Warn("could not head object from shard",
zap.Stringer("shard", sh.ID()),
zap.String("error", err.Error()),
)
return false
}
}
head = res.Object()
return true
})
if outSI != nil {
return nil, objectSDK.NewSplitInfoError(outSI)
}
if head == nil {
return nil, outError
}
return &HeadRes{
head: head,
}, nil
}
// Head reads object header from local storage by provided address.
func Head(storage *StorageEngine, addr *objectSDK.Address) (*object.Object, error) {
res, err := storage.Head(new(HeadPrm).
WithAddress(addr),
)
if err != nil {
return nil, err
}
return res.Header(), nil
}
// HeadRaw reads object header from local storage by provided address and raw
// flag.
func HeadRaw(storage *StorageEngine, addr *objectSDK.Address, raw bool) (*object.Object, error) {
res, err := storage.Head(new(HeadPrm).
WithAddress(addr).
WithRaw(raw),
)
if err != nil {
return nil, err
}
return res.Header(), nil
}