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

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package blobstor
import (
"context"
"encoding/hex"
"errors"
"time"
"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"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
// Get reads the object from b.
// If the descriptor is present, only one sub-storage is tried,
// Otherwise, each sub-storage is tried in order.
func (b *BlobStor) Get(ctx context.Context, prm common.GetPrm) (res common.GetRes, err error) {
var (
startedAt = time.Now()
)
defer func() {
b.metrics.Get(time.Since(startedAt), len(res.RawData), err == nil, prm.StorageID != nil)
}()
ctx, span := tracing.StartSpanFromContext(ctx, "BlobStor.Get",
trace.WithAttributes(
attribute.String("address", prm.Address.EncodeToString()),
attribute.Bool("raw", prm.Raw),
attribute.String("storage_id", hex.EncodeToString(prm.StorageID)),
))
defer span.End()
b.modeMtx.RLock()
defer b.modeMtx.RUnlock()
if prm.StorageID == nil {
for i := range b.storage {
res, err = b.storage[i].Storage.Get(ctx, prm)
if err == nil || !errors.As(err, new(apistatus.ObjectNotFound)) {
return res, err
}
}
return common.GetRes{}, logicerr.Wrap(apistatus.ObjectNotFound{})
}
if len(prm.StorageID) == 0 {
res, err = b.storage[len(b.storage)-1].Storage.Get(ctx, prm)
} else {
res, err = b.storage[0].Storage.Get(ctx, prm)
}
return res, err
}