86 lines
2.0 KiB
Go
86 lines
2.0 KiB
Go
package blobovnicza
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import (
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"bytes"
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"context"
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"errors"
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"git.frostfs.info/TrueCloudLab/frostfs-observability/tracing"
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apistatus "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/client/status"
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oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
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"go.etcd.io/bbolt"
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"go.opentelemetry.io/otel/attribute"
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"go.opentelemetry.io/otel/trace"
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)
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// GetPrm groups the parameters of Get operation.
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type GetPrm struct {
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addr oid.Address
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}
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// GetRes groups the resulting values of Get operation.
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type GetRes struct {
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obj []byte
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}
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// SetAddress sets the address of the requested object.
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func (p *GetPrm) SetAddress(addr oid.Address) {
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p.addr = addr
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}
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// Object returns binary representation of the requested object.
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func (p GetRes) Object() []byte {
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return p.obj
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}
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// special error for normal bbolt.Tx.ForEach interruption.
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var errInterruptForEach = errors.New("interrupt for-each")
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// Get reads an object from Blobovnicza by address.
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//
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// Returns any error encountered that
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// did not allow to completely read the object.
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//
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// Returns an error of type apistatus.ObjectNotFound if the requested object is not
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// presented in Blobovnicza.
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func (b *Blobovnicza) Get(ctx context.Context, prm GetPrm) (GetRes, error) {
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_, span := tracing.StartSpanFromContext(ctx, "Blobovnicza.Get",
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trace.WithAttributes(
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attribute.String("path", b.path),
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attribute.String("address", prm.addr.EncodeToString()),
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))
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defer span.End()
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var (
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data []byte
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addrKey = addressKey(prm.addr)
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)
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if err := b.boltDB.View(func(tx *bbolt.Tx) error {
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return tx.ForEach(func(bucketName []byte, buck *bbolt.Bucket) error {
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if isNonDataBucket(bucketName) {
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return nil
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}
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data = buck.Get(addrKey)
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if data == nil {
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return nil
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}
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data = bytes.Clone(data)
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return errInterruptForEach
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})
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}); err != nil && err != errInterruptForEach {
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return GetRes{}, err
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}
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if data == nil {
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return GetRes{}, new(apistatus.ObjectNotFound)
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}
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return GetRes{
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obj: data,
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}, nil
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}
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