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

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package blobstor
import (
"github.com/TrueCloudLab/frostfs-node/pkg/local_object_storage/blobstor/common"
"go.uber.org/zap"
)
// Exists checks if the object is presented in BLOB storage.
//
// Returns any error encountered that did not allow
// to completely check object existence.
func (b *BlobStor) Exists(prm common.ExistsPrm) (common.ExistsRes, error) {
b.modeMtx.RLock()
defer b.modeMtx.RUnlock()
if prm.StorageID != nil {
if len(prm.StorageID) == 0 {
return b.storage[len(b.storage)-1].Storage.Exists(prm)
}
return b.storage[0].Storage.Exists(prm)
}
// If there was an error during existence check below,
// it will be returned unless object was found in blobovnicza.
// Otherwise, it is logged and the latest error is returned.
// FSTree | Blobovnicza | Behaviour
// found | (not tried) | return true, nil
// not found | any result | return the result
// error | found | log the error, return true, nil
// error | not found | return the error
// error | error | log the first error, return the second
var errors []error
for i := range b.storage {
res, err := b.storage[i].Storage.Exists(prm)
if err == nil && res.Exists {
return res, nil
} else if err != nil {
errors = append(errors, err)
}
}
if len(errors) == 0 {
return common.ExistsRes{}, nil
}
for _, err := range errors[:len(errors)-1] {
b.log.Warn("error occurred during object existence checking",
zap.Stringer("address", prm.Address),
zap.String("error", err.Error()))
}
return common.ExistsRes{}, errors[len(errors)-1]
}