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

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package writecachebadger
import (
"context"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/internal/metaerr"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/util/logicerr"
"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/local_object_storage/writecache"
"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"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"github.com/dgraph-io/badger/v4"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/trace"
)
// Get returns object from write-cache.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in write-cache.
func (c *cache) Get(ctx context.Context, addr oid.Address) (*objectSDK.Object, error) {
_, span := tracing.StartSpanFromContext(ctx, "writecache.Get",
trace.WithAttributes(
attribute.String("address", addr.EncodeToString()),
))
defer span.End()
obj, err := c.getInternal(addr)
return obj, metaerr.Wrap(err)
}
func (c *cache) getInternal(addr oid.Address) (*objectSDK.Object, error) {
found := false
storageType := writecache.StorageTypeUndefined
startedAt := time.Now()
defer func() {
c.metrics.Get(time.Since(startedAt), found, storageType)
}()
k := addr2key(addr)
value, err := Get(c.db, k[:])
if err == nil {
obj := objectSDK.New()
found = true
storageType = writecache.StorageTypeDB
return obj, obj.Unmarshal(value)
}
return nil, logicerr.Wrap(new(apistatus.ObjectNotFound))
}
// Head returns object header from write-cache.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in write-cache.
func (c *cache) Head(ctx context.Context, addr oid.Address) (*objectSDK.Object, error) {
_, span := tracing.StartSpanFromContext(ctx, "writecache.Head",
trace.WithAttributes(
attribute.String("address", addr.EncodeToString()),
))
defer span.End()
obj, err := c.getInternal(addr)
if err != nil {
return nil, metaerr.Wrap(err)
}
return obj.CutPayload(), nil
}
// Get fetches object from the underlying database.
// Key should be a stringified address.
//
// Returns an error of type apistatus.ObjectNotFound if the requested object is missing in db.
func Get(db *badger.DB, key []byte) ([]byte, error) {
var value []byte
err := db.View(func(tx *badger.Txn) error {
it, err := tx.Get(key)
if err != nil {
if err == badger.ErrKeyNotFound {
return logicerr.Wrap(new(apistatus.ObjectNotFound))
}
return err
}
v, err := it.ValueCopy(nil)
if err != nil {
return err
}
value = v
return nil
})
return value, metaerr.Wrap(err)
}