frostfs-node/pkg/local_object_storage/blobstor/blobovniczatree/get.go

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package blobovniczatree
import (
"context"
"encoding/hex"
"fmt"
"path/filepath"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-node/internal/logs"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobovnicza"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
objectSDK "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
"go.uber.org/zap"
)
// Get reads object from blobovnicza tree.
//
// If blobocvnicza ID is specified, only this blobovnicza is processed.
// Otherwise, all Blobovniczas are processed descending weight.
func (b *Blobovniczas) Get(ctx context.Context, prm common.GetPrm) (res common.GetRes, err error) {
var (
startedAt = time.Now()
found = false
size = 0
)
defer func() {
b.metrics.Get(time.Since(startedAt), size, found, prm.StorageID != nil)
}()
ctx, span := tracing.StartSpanFromContext(ctx, "Blobovniczas.Get",
trace.WithAttributes(
attribute.String("path", b.rootPath),
attribute.String("address", prm.Address.EncodeToString()),
attribute.String("storage_id", hex.EncodeToString(prm.StorageID)),
attribute.Bool("raw", prm.Raw),
))
defer span.End()
var bPrm blobovnicza.GetPrm
bPrm.SetAddress(prm.Address)
if prm.StorageID != nil {
id := blobovnicza.NewIDFromBytes(prm.StorageID)
blz, err := b.openBlobovnicza(id.String())
if err != nil {
return res, err
}
res, err = b.getObject(ctx, blz, bPrm)
if err == nil {
found = true
size = len(res.RawData)
}
}
activeCache := make(map[string]struct{})
err = b.iterateSortedLeaves(ctx, &prm.Address, func(p string) (bool, error) {
dirPath := filepath.Dir(p)
_, ok := activeCache[dirPath]
res, err = b.getObjectFromLevel(ctx, bPrm, p, !ok)
if err != nil {
if !blobovnicza.IsErrNotFound(err) {
b.log.Debug(logs.BlobovniczatreeCouldNotGetObjectFromLevel,
zap.String("level", p),
zap.String("error", err.Error()),
)
}
}
activeCache[dirPath] = struct{}{}
// abort iterator if found, otherwise process all Blobovniczas
return err == nil, nil
})
if err == nil && res.Object == nil {
// not found in any blobovnicza
return res, logicerr.Wrap(apistatus.ObjectNotFound{})
}
found = true
size = len(res.RawData)
return
}
// tries to read object from particular blobovnicza.
//
// returns error if object could not be read from any blobovnicza of the same level.
func (b *Blobovniczas) getObjectFromLevel(ctx context.Context, prm blobovnicza.GetPrm, blzPath string, tryActive bool) (common.GetRes, error) {
lvlPath := filepath.Dir(blzPath)
// try to read from blobovnicza if it is opened
b.lruMtx.Lock()
v, ok := b.opened.Get(blzPath)
b.lruMtx.Unlock()
if ok {
if res, err := b.getObject(ctx, v, prm); err == nil {
return res, err
} else if !blobovnicza.IsErrNotFound(err) {
b.log.Debug(logs.BlobovniczatreeCouldNotReadObjectFromOpenedBlobovnicza,
zap.String("path", blzPath),
zap.String("error", err.Error()),
)
}
}
// therefore the object is possibly placed in a lighter blobovnicza
// next we check in the active level blobobnicza:
// * the freshest objects are probably the most demanded;
// * the active blobovnicza is always opened.
b.activeMtx.RLock()
active, ok := b.active[lvlPath]
b.activeMtx.RUnlock()
if ok && tryActive {
if res, err := b.getObject(ctx, active.blz, prm); err == nil {
return res, err
} else if !blobovnicza.IsErrNotFound(err) {
b.log.Debug(logs.BlobovniczatreeCouldNotGetObjectFromActiveBlobovnicza,
zap.String("path", blzPath),
zap.String("error", err.Error()),
)
}
}
// then object is possibly placed in closed blobovnicza
// check if it makes sense to try to open the blob
// (Blobovniczas "after" the active one are empty anyway,
// and it's pointless to open them).
if u64FromHexString(filepath.Base(blzPath)) > active.ind {
return common.GetRes{}, logicerr.Wrap(apistatus.ObjectNotFound{})
}
// open blobovnicza (cached inside)
blz, err := b.openBlobovnicza(blzPath)
if err != nil {
return common.GetRes{}, err
}
return b.getObject(ctx, blz, prm)
}
// reads object from blobovnicza and returns GetSmallRes.
func (b *Blobovniczas) getObject(ctx context.Context, blz *blobovnicza.Blobovnicza, prm blobovnicza.GetPrm) (common.GetRes, error) {
res, err := blz.Get(ctx, prm)
if err != nil {
return common.GetRes{}, err
}
// decompress the data
data, err := b.compression.Decompress(res.Object())
if err != nil {
return common.GetRes{}, fmt.Errorf("could not decompress object data: %w", err)
}
// unmarshal the object
obj := objectSDK.New()
if err := obj.Unmarshal(data); err != nil {
return common.GetRes{}, fmt.Errorf("could not unmarshal the object: %w", err)
}
return common.GetRes{Object: obj, RawData: data}, nil
}